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CEMENT INDUSTRIES: 
EHS CONSIDERATIONS 
A Presentation By 
Dr. V.C. Srivastava 
Assistant Professor, 
Department of Chemical Engineering, 
Indian Institute of Technology Roorkee, 
Roorkee – 247667, India. 
Email: vimalfch@iitr.ernet.in
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
INTRODUCTION 
 Cement production is yardstick for measurement of civilization and 
industrialization. 
 Significant role in providing shelter to mankind, infrastructural 
development of the nation. 
 The recent boom in infrastructure and the housing market. 
 Indian cement industry 
 first bag of cement was packed in 1914 at Porbundar. 
 ranks second next only to China 
 According to a report by the ICRA Industry Monitor, the installed capacity 
is expected to increase to 186 mt per annum (mtpa) by the end of FY 2008, 
and 219 mtpa by end of FY 2009, and further up to 241 mtpa by FY 2010- 
end. 
 As a result, India's cement industry will record an annual growth at around 
10%.
Cement consumption 1985-2020E (million t) 
Continent 1985 2003 2020 % pa growth 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
03-20 
Developed 
countries 323 410.5 475 0.80 % 
Developing 
countries 363.7 1202.5 2586.5 4.30 % 
Total 686.7 1612.9 3061.5 3.60 %
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Indian cement industry 
 Cement consumption per capita 
 India - 99 kg/capita (one of the lowest) 
 China - 450 kg/capita. 
 Japan - 631 kg/capita 
 World average - 267 kg/capita. 
 Cement plants in our country have mostly changed from the 
wet process to the energy efficient dry process. 
 Indian industry matches quite well with world standards in 
terms of energy (thermal energy kcal/kg of clinker – India 665 
against 690 of Japan) and pollution norms (SPM of 40 in India 
against 20 of Japan). 
 The average performance of the Indian industry is lagging 
behind.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
PROCESS TECHNOLOGY 
 Alternative technologies: Wet process, Semi-dry process and 
Dry process. 
 Major steps in manufacturing 
 Acquisition and transportation of raw materials 
 Preparation of raw materials 
 Pyroprocessing of raw materials to form cement clinker. 
 Cooling and grinding of clinker with gypsum into cement 
 Storage and packaging
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
ENVIRONMENTAL IMPACT
The raw materials for cement production are 
 limestone or other source of CaCO3 (about 80 to 85% 
of input), 
 clay (about 15 to 20% of input), 
 other (a few % of input) to provide Si, Fe and Al. 
 One needs approximately 1.5 kg of input material for 
1 kg of cement output, the loss of mass being emitted 
as pollutant. 
 The fuel energy requirement is around 3700 MJ 
(1028 kWh) per tonne of clinker. 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
ENVIRONMENTAL 
HAZARADS AND 
MANAGEMENT IN CEMENT 
INDUSTRIES
Environment Pollution due to Cement manufacture 
Pollution causing activities of cement manufacture 
 Off Plant pollution 
 In- plant pollution 
 Application generated 
Fugitive emissions 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Environmental Impact of Cement Manufacture
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
INTRODUCTION 
 Major environmental issues are 
 dust pollution 
 emission of Green House Gases (GHG), 
 ecological concern arising from the degradation of mined-out areas, 
 noise and transport pollution. 
 Cement related GHG emissions originate from 
 fossil fuel combustion at cement manufacturing operation (40%) 
 transport activities (5%) 
 combustion of fossil fuel that is required to make the electricity (5%). 
 Other manufacturing process (about 50%)
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
ENVIRONMENTAL ISSUES 
 Fugitive emissions are quite high in cement industries 
and requires immediate attention for control. 
 Continuous dust monitoring system with data logger 
should be installed by all the cement industries and 
calibration should be done from time to time. 
 Pet-coke containing about sulphur is being used as 
fuel in cement kiln in few units. 
The SO2 emission 
vanadium and nickel emission. 
 It is necessary to frame fuel quality specifications for 
the cement industries.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
ENVIRONMENTAL ISSUES 
 Emission standards for particulate matter is quite relaxed in 
comparision to other countries like USA, Japan, Germany. Need 
is being felt to revise the emissions standards. 
 Cement industries have potential to utilise industrial wastes like 
flyash, blast furnace slag, phosphogypsum. But the present 
utilization is low and needs to be enhanced. 
 In Indian cement industries, 40% of total heat input is going as 
waste heat, which should be utilized for co-generation of power. 
This is already being practiced in Japan, China & South East 
Asian Countries. 
 The need of identifying incinerable hazardous waste for use as 
fuel in cement kiln is also stressed.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
List of impact categories 
Type Impact category Unit Spatial Scope 
Squandering 
of resources 
Abiotic resources - Global 
Biotic resources Year-1 Global/regional 
Land - Local 
Pollution Global warming kg CO2-eq. Global 
Depletion of the ozone 
layer 
kg CFC-11 eq. Global 
Human toxicity kg b.w.a Global/continental/regional/local 
Aquatic ecotoxicity m3 polluted watera Global/continental/regional/local 
Terrestrial ecotoxicity kg polluted soila Global/continental/regional/local 
Photochemical 
kg C2H4-eq. Continental/regional/local 
oxidantformation 
Acidification kg SO2-eq. Continental/regional/local 
Eutrophication kg P-eq. Continental/regional/local 
Waste heat MJ Regional/local 
Odour m3 polluted aira Local 
Noise Pa2*s Local 
Affection Ecosystem and 
landscape 
m2·s Global/continental/regional/local 
Death — Local 
aPolluted to a defined threshold level.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Pollutants Released by Cement Kilns 
 Carbon dioxide (global warming gas) 
 Acid Gases, Nitrogen Oxides, Sulfur 
Dioxide, Particulate Matter 
 19 heavy metals, including lead, mercury, 
cadmium and chromium VI 
 Products of Incomplete Combustion (PICs), 
including dioxins, furans and Polycyclic 
Aromatic Hydrocarbons (PAHs) 
Source: http://www.texascenter.org/publications/kiln.htm
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Pollutants Released by Cement Kilns 
 “Upset” events in cement kilns operation trigger 
increased emissions from the stack and “fugitive” 
(non-stack) emissions from the cement kiln itself. 
 When handling, storing and burning liquid hazardous 
wastes, fugitive emissions can be released from 
numerous points at ground level such as the seals on 
the cement kiln, vents and pressure release valves, the 
storage tanks, and transfer points from the storage 
tanks through the pumps and into the rotary kiln.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Dioxin Facts 
 Dioxins and furans are the most toxic 
chemicals known to science 
 Dioxins cause infertility, learning 
disabilities, endometriosis, birth defects, 
sexual reproductive disorders, damage to 
the immune system, cancer and more. 
 93% of dioxin exposure is from eating meat 
and dairy products.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
How to make dioxin 
 Dioxins are created by burning hydrocarbons 
(fossil fuels, tires, hazardous wastes) with 
chlorine (present in coal, tires and some 
hazardous wastes) in the presence of oxygen. 
 Dioxin emissions increase when: 
More chlorine is in the fuel/waste stream 
Certain metal catalysts are present 
The gases stay in a low temperature range (200- 
450o C)
• Only generally used for sulfur oxides (SOx), nitrogen 
oxides (NOx), oxygen (O2), carbonmonoxide (CO) and 
opacity (indirectly monitoring particulate matter) 
• Technology now exists to continuously monitor: 
Ammonia (NH4) 
Carbon Dioxide (CO2) 
Hydrogen Sulfide (H2S) 
Acid Gases: 
Sulfuric Acid (H2SO4) 
Hydrofluoric Acid (HF) 
Hydrochloric Acid (HCl) 
Products of Incomplete Combustion (PICs): 
Dioxins & Furans 
Polycyclic Aromatic Hydrocarbons (PAHs) 
Volatile Organic Compounds (VOCs) 
Metals: 
Antimony (Sb) 
Arsenic (As) 
Barium (Ba) 
Cadmium (Cd) 
Chromium (Cr) 
Lead (Pb) 
Manganese (Mn) 
Mercury (Hg) 
Silver (Ag) 
Nickel (Ni) 
Zinc (Zn) 
…and more 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Continuous Emissions Monitors 
www.ejnet.org/toxics/cems.html
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Cement Kiln Dust (CKD) 
 Large amounts of fine material given off and 
carried out by flow of hot gas within cement kiln 
 Collected using pollution control systems like 
cyclones, electrostatic precipitators, or 
baghouses, and is then landfilled either on or off 
site. 
 Dry process cement kilns generally produce more 
CKD 
 Some CKD is “recycled” into the cement 
product.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
“Beneficial” Uses 
 Not considered hazardous waste by US EPA 
 Soil Stabilization 
 Stabilization and Solidification of Waste 
 Cement Replacement 
 Asphalt Pavement 
 Mine Fill 
 Crop Enhancer
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
What’s in Cement Kiln Dust? 
 Calcium Oxide 
 Toxic metals: Arsenic, Chromium, Cadmium, 
Antimony, Barium, Beryllium, Lead, Silver, 
Mercury, Thallium, Selenium, Nickel 
 Dioxin, Furans
Cement Kiln Dust More Toxic when 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Burning Hazardous Waste 
Hazardous Waste Fuels vs. Traditional Fuels 
 Hazardous Waste either emitted into air, absorbed into 
CKD, or into clinker (final product) 
 Using hazardous waste produces 104% more cement 
kiln dust by volume 
 Lead concentrations 250% higher 
 Cadmium concentrations 150% higher 
 Chromium concentrations 50% higher 
 Selenium concentrations 100% higher 
 700 times more dioxin 
Source: EPA, Report to Congress on CKD, December 1993) 
Source: Downwinders (http://www.downwindersatrisk.org/DownwindersAtRisk- 
100FactsAboutTheIncineration.htm)
Cement Industry & Green house Gas (GHG) Emissions 
 5% of global man-made CO2 emissions 
 Cement industry's emission of CO2 is next only to thermal 
power plants (coal based). 
 The approximate contributions of each of the CO2 sources are: 
 Calcination 50 - 55% 
 Fuel combustion 40 - 50% 
 Electricity 0 - 10% 
 Total CO2 emissions per tonne of cement (assuming a 0.95:1 
clinker to cement ratio) ranges about from 0.85 to 1.15 tonne. 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Limiting CO2 emissions 
Process modification 
 Substitution of coal by lower carbon fuels like 
lignite and natural gas, 
 Use of washed coal, 
 Improved kilns, 
 Use of renewable sources of energy like solar, 
wind energy also come under this category. 
 Afforestation and planting of trees in the plants' 
environs; these act like a "sink" for GHG's.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Limiting CO2 emissions 
Product modification 
 Blended cement manufacture 
 Increased use of pozzolana in concrete. 
Lower clinker content 
Increase fuel efficiency 
Alternative fuels
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Improved Waste Management 
Using Cement Kilns to Manage Waste Problems 
 High temperature, long residence time 
 Well controlled process 
 Can safely process alternative materials with 
appropriate handling, training and safety procedures 
 More than 10 million tons of Hazardous Wastes is 
co-processed in cement kilns annually 
 Potential use to dispose of off-date pesticides 
(approx. 500 mil pounds worldwide) 
 Potential to provide sound disposal option for many 
wastes in India.
HEALTH HAZARADS 
AND MANAGEMENT IN 
CEMENT INDUSTRIES
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Health Issues 
The main health hazards which may have implications 
for health are as follows: 
 Airborne dust 
 Noise and vibration 
 Dangerous atmospheres 
 Handling of alternative fuels 
The incidence of such over exposure is generally so low 
as not to require statistical monitoring or reporting. 
 No universal industry standard yet exists on 
monitoring and reporting.
Guidelines on Specific Health Issues 
Airborne Dust 
 Cement production produces dust that without effective control 
leads to respiratory disease. 
 There are some indications of elevated chronic obstructive lung 
diseases. 
GOOD PRACTICE 
 Limit dust levels, and employee exposure. 
 Appropriate respiratory protection should be worn where work 
has to be carried out in dusty areas in cement plants. 
 Various limits exist in different countries 
 Exposure limits for Respirable Crystalline Silica are now under 
review. 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
Guidelines on Specific Occupational Health Issues 
Noise and Vibration 
 Main sources of noise are the milling plants used to 
grind the cement product. 
 PPE are required for noise levels below 80 dB. 
 Noise deflectors and improved sound insulation. 
 Improved noise personal protective equipment 
 Workers to wear appropriate hearing protection. 
 Many companies regularly monitor employee 
auditory functions to ensure this does not exceed 
natural decline with age. 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
Guidelines on Specific Occupational Health Issues 
Noise and Vibration 
 Whole body vibration is another issue. 
 Workers driving older heavy mobile equipment can 
be exposed to vibration. 
 Modern mobile equipment combine 
 lower inherent vibration with 
 damped seating and insulated cabins, reducing the hazard 
to insignificant levels. 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
Guidelines on Specific Occupational Health Issues 
Dangerous Atmospheres 
 Coal and petroleum coke mill areas, where fine 
airborne particles can create an explosion 
hazard. 
 Kiln and raw mill cyclones and ducting, where 
un-ventilated process gases could lead to a 
shortfall of oxygen during maintenance work. 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
Guidelines on Specific Occupational Health Issues 
Dangerous Atmospheres 
Working in Coal/Petroleum Coke Processing Areas 
 Quantities of coal or coke may self-ignite, if conditions allow, 
leading to the possibility of bursting into flame 
 avoid spillages where possible 
 clean up spillages as soon as they occur. 
 A mixture of coal dust or coke dust and air is potentially 
explosive, leading to the possibility of a violent blast 
 avoid creating dust clouds 
 remove source of ignition such as glowing coal, sparks, welding, 
grinding, static, electricity, smoking etc. 
 Smoking must be strictly forbidden at all times throughout all the coal 
processing areas 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
Guidelines on Specific Occupational Health Issues 
Environmental Health 
 Cement-making raw materials do sometimes contain 
trace amounts of toxic elements such as mercury, 
thallium, iodine, cadmium and other heavy metals. 
 Stack emissions are monitored where appropriate for 
these trace components. 
 The cement-making process can also lead to trace 
emissions of POP’s (Persistent Organic Pollutants). 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
Guidelines on Specific Occupational Health Issues 
Handling of Alternative Fuels 
 Plastics: Recycled plastics are normally used 
in shredded form and conveyed pneumatically. 
There can be considerable associated dust 
requiring eye protection and breathing masks as 
well as full body clothing, metal silos and ducts 
need electrical earthing to prevent an explosion 
hazard. 
Fire protection is also required, as well as 
evacuation instruction in the case of fire, as smoke 
vapours can be toxic. 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
Guidelines on Specific Occupational Health Issues 
Handling of Alternative Fuels 
 Recycled solvents must be rigorously sampled at intake because of 
variable chemical and physical composition in order to determine health 
precautions. 
 Most solvents are toxic and may be flammable. Therefore health 
precautions are similar to those used in the source industry (e.g. 
chemical, pharmaceutical) Intake and storage systems must be designed 
for safe, automated handling, with spill, fire and explosion protection, 
with an associated emergency plan. 
 Health procedures require eye protection, breathing masks and full 
cover clothing. 
 Used Oils & Oil Emulsions : 
 Used oils will need to be checked for PCB content that will determine 
precise precautions required. 
 Requirements are generally similar to those for solvents, with similar 
health precautions. 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
 Solvents: 
January 25-29, 
2010
Guidelines on Specific Occupational Health Issues 
Handling of Alternative Fuels 
 Sewage Sludge: 
While sewage sludge is generally pre-treated there is a 
possibility of biological infection. 
 Hence the main emphasis is on avoidance of skin contact 
and skin protections through use of gloves and appropriate 
clothing, followed by usual employee hygiene precautions 
afterwards. 
 This listing of secondary fuels is indicative only. 
 In general, rules for handling these and any other 
materials should be equivalent to those used in the 
industry from which these are sourced. 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
Guidelines on Specific Occupational Health Issues 
Other General Guidelines are: 
 All operating personnel should have a thorough knowledge of 
methods for competent operation of the fuel handling systems 
in normal operation, startup, shutdowns and emergency 
situations. 
 Persons handling fuels should be advised of hazards, proper 
procedures, precautions, health effects and recommendations 
for emergency treatment. 
 An emergency plan should adequately address possible 
emergencies that may arise during transport, storage, handling, 
and processing. 
 An emergency shower and eye washing station should be 
clearly marked and located near the storage areas of liquid and 
alternative fuels. 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Other possible health risks 
 Health risks due to vermin and others pests can 
arise particularly in warmer countries due to 
unhygienic conditions and due to storage of 
secondary fuels such as tyres. 
 Minor quantities of toxic chemicals may also 
be used in the manufacturing process. These 
include laboratory chemicals and other 
cleaning fluids and solvents. 
 Transformers and capacitors may also contain 
PCB (Poly-Chloro-Biphenyl) liquids.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Product related health risks 
 Due to its properties, e.g. the high pH value, the handling of 
cement has to be done carefully. 
 Material Safety Data Sheets (MSDS) enable users of cement to 
take the necessary measures relating to protection of health and 
safety in the workplace. 
 Persons placing substances and preparations on the market 
should ensure that persons, coming in contact with cement, 
have received appropriate training and use the protective 
equipment correctly. 
Special attention has to be paid to 
 skin protection 
 eye protection 
 protection of the respiratory system.
SAFETY HAZARADS 
AND MANAGEMENT IN 
CEMENT INDUSTRIES
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Fatality Analysis 
A fatality anaylsis data from a number of Cement 
Sustainability Initiative (CSI) members was collected 
and analysed. It was found that: 
 There was a total of 389 Fatalities in ~300,000 
employed over (2003-2007) 
79% of all fatalities arise from 3 main causes 
 Traffic & Mobile Plant (43%) 
 Falls from Heights & Items falling (21%) 
 Caught in Moving/Starting Equipment (15%) 
 Others were…
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Fatality Analysis
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Fatality Analysis 
Fatalities by Age, hour, day and month, work 
category 
 Employee Fatalities peak in 30’s & 40’s 
 Contractor Fatalities peak in later 40’s & 50’s 
 Third Party Fatalities peak in the teens 
 Data collected also show: Highest Peak fatality time 
is 10am to Noon 
 More fatalities occur on Monday than on any other 
day of the week 
 Peak injury rates occur in January & March, 
possibly related to cold weather conditions 
 Drivers account for nearly 50% of the fatalities
Conclusion: Fatality Causes & Prevention 
High Risk Categories: Prevention: 
Contractors Contractor Safety Management 
Young/Temporary Employees Special Safety Induction 
Direct Causes 
Traffic & Mobile Plant (43%) Driver Training 
Falls from Heights, Objects 
falling from Heights (21%) 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Safety Procedures for Work at 
Heights, Overhead Protection 
Caught in Starting/Moving 
Equipment (15%) 
Plant Isolation Procedures
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Lost Time Injury Analysis 
Typical Injury Causes & Types 
 Main causes are Slips, Trips and Falls (29%), 
 Falling or Moving Objects (19%) and 
 Lifting, Overload and Exertion (18%). 
These three causes account for 66% of the total accidents. 
 Most Injuries are to Arms and Hands (32%), Legs 
and Feet (25%) and Back (13%) 
 These injuries are 71% of the total
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Lost Time Injury Analysis
 Most Injuries are to Arms and Hands (32%), 
Legs and Feet (25%) and Back (13%) 
 These injuries are 71% of the total 
 Typical Injury Categories and Ages 
 Plant Operators (39%) and General Operatives 
(33%) are the most injury prone. 
 30-39 is the most injury prone age range 
(33%), followed by 20-29 (25%), and 40-49 
(24%) 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
Conclusion on Injury Causes & Prevention 
Injury Causes: Prevention: 
Slip, Trips & Falls Housekeeping, clear designated 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
walkways 
Falling/Moving Objects Guards on Machines and elevated areas 
Lifting & Overload Manual Handling Training 
Injury Types 
Arms and Hands Proper use of Personal Protective 
Equipment (PPE) 
Legs and Feet Proper use of PPE 
Back Injuries Lifting gear, lifts
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Good Practices in Safety 
Mobile Plant 
 Common hazards associated with the heavy plant 
(e.g. dumper trucks, front loading shovels, fork lift 
trucks) used in quarrying and bulk material transport 
include vehicle impact and twisted ankles during 
embarking and disembarking. 
 Incidents can be reduced by 
 improved driver training, 
 increasing awareness of the people working alongside these 
vehicles, and 
 by using dedicated routes and crossings. 
 Modern vehicles also offer improved visibility, helping 
further reduce the risks.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Good Practices in Safety 
Working at Height 
 Controls relating to working 
at height or in confined 
areas (e.g. Permit-to-work) 
 Mandatory use of safety 
equipment (harnesses, 
safety nets) to properly 
protect workers from falls, 
posting of permits.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Good Practices in Safety 
Slips, Trips and Falls 
 A nut or bolt falling from a height can kill a person REMEMBER 
THAT 
 Keep work places tidy 
 Use the scrap and dirt bins where provided 
 Pile material so that it is stable and steady 
 Put tools and other equipment where they can not possibly fall or be 
knocked on to someone below. 
 Clearly mark, fence or cover all openings in floor, roof or ground. 
 All excavations in the plant should be surrounded with a handrail 
 When working overhead remove all loose material such as bolts, 
screws, tools, timbers, fittings, etc. when the job is finished. 
 Never throw tools or materials, always pass them from hand to hand.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Good Practices in Safety 
Fire 
 As a generality, there are few combustible materials 
in the process equipment in a cement plant, with the 
exception of conveyor belts. 
 Several cases of significant conveyor belt fires have 
arisen, where belt misalignment and/or friction 
caused heat build-up and subsequent ignition. 
 Heat detectors may be used at conveyor tension stations, 
and belts may be purchased made of less/noncombustible 
material, to lessen the risk of fire. Fire fighting procedures 
must also be in place. 
 Electrical cables may also cause or transmit a fire, 
also with emission of highly toxic smoke.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Good Practices in Safety 
Fire 
 Storage of fuels of all types must be in accordance 
with local fire regulations and good practice. 
 This applies also to external stockpiles of coal, pet-coke, 
tyres and the like, where appropriate fire 
precautions will be required, particularly in hot dry 
weather. 
 Storage of waste combustible materials will create a 
fire hazard. 
 Proper waste disposal and good housekeeping is the 
best form of prevention.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Good Practices in Safety 
Entry into Silos and Confined Spaces 
 A confined space is any space of an enclosed nature 
where there is a risk of death or serious injury from 
hazardous substances or dangerous conditions. The 
risks in confined spaces arise due to 
 Lack of oxygen 
 Poisonous gas, fumes or vapour 
 Liquids and solids, which can fill the space suddenly 
 Fire and explosions 
 Dust 
 Hot conditions
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Good Practices in Safety 
Avoid entry to confined spaces, 
 e.g. by doing the work from outside 
 Blockages can be cleared in silos by use of remotely operated rotating 
flail devices, vibrators or air purgers 
 Inspection, sampling and cleaning operations using the right equipment 
 Remote cameras can be used for internal inspection of vessels 
If entry is unavoidable, follow a safe system of work 
 Appointment of supervisor 
 Cleaning before entry 
 Check the size of the entrance 
 Provision of ventilation 
 Testing the air 
 Provisions of special tools and lighting 
 Provision of breathing apparatus
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Good Practices in Safety 
Electrocution 
 As cement plants are very energy intensive, there will 
be significant power distribution equipment in all 
plants. 
 Electrical maintenance must be conducted on a 
professional basis. 
Machine Guarding 
 Where there is a risk of physical contact with moving 
parts of work equipment which could lead to injuries, 
 those parts must be provided with guards or devices to 
prevent access to danger zones.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Good Practices in Safety 
Heat Burns 
 Incidents and injuries resulting in burns arise from 
contact with hot clinker or cement powder. Hazards 
are particularly associated with 
 hot cement kiln dust (CKD), and 
 dust on preheater systems. 
 Contact is possible during abnormal operation of the 
plant, when clearing blockages, carrying out 
maintenance or in emergency situations. 
 From contact with combustible materials; oils, 
scaffold boards, ladders, electrical cabling, etc.
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Good Practices in Safety 
Raw Mill and Preheater Tower: Material in the mill is 
at temperatures up to 120ºC, in the tower the material 
can be as hot as 900ºC. Contact is more likely when: 
 Clearing blockages in the tower where there is the 
potential for it to flush through the process 
Hot Clinker: Contact is possible in the: 
 clinker cooler building 
 along the clinker pan conveyors 
 in the clinker dome 
 along the belts to the cement mills
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Good Practices in Safety 
Precipitator and By-Pass Dust: 
 access is required to the precipitator hoppers 
 working on the screws and drag chain conveyors 
 maintaining the dust transfer pumps 
Hot Cement: Contact is possible when: 
 accessing the cement transfer lines 
 working on the packers 
 carrying out work on the cement screw conveyors and 
drag chains
Control / Management of the risks 
 Eliminate the hazard 
 Reduce the risk at source 
 Isolate people from the hazard 
 Control the risk by other means 
 Protect with the correct PPE 
Other Good Practices 
 The use of “high visibility” clothing is strongly recommended 
particularly under poorer lighting conditions. 
 Good lighting around cement plants is also a pre-requisite for 
safety of night-time operation and maintenance activities. 
 Use of mobile phones should be restricted in areas where 
inattention could cause serious consequences. 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
Life saving rules 
 Any person working on equipment with moving parts must personally 
ensure the equipment is de-energized, isolated and locked/tagged out 
 Any person working from a position with the potential for a fall of 1.8 
meters or more must use fall protection 
 Any person doing flame welding, cutting or brazing up to 6 meters from 
any flammable material must obtain a proper hot work permit and apply 
the requirements 
 Any person entering a confined space must obtain a proper confined space 
entry permit and apply the requirements 
 Prescribed PPE shall always be worn when exposed to open processes or 
systems (e.g. clearing material blockages, electrical work, etc …) 
 Using illegal drugs is strictly forbidden on any site - use of alcohol or other 
legal drugs that can effect personal concentration is discouraged
GLOBAL ISSUSE FACING THE CEMENT INDUSTRIES 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010
SUSTAINABLE DEVELOPMENT OF CEMENT 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
MANUFACTURE
CCOONNCCLLUUSSIIOONN 
STEPS TOWARDS 
SUSTAINABLE CEMENT 
PRODUCTION... 
IInndduussttrriiaall EEccoossyysstteemm 
CClleeaanneerr PPrroodduuccttiioonn 
EEnnvv.. MMaannaaggeemmeenntt 
HHeeaalltthh MMaannaaggeemmeenntt 
SSaaffeettyy MMaannaaggeemmeenntt 
CCoonnsseerrvvaattiioonn ooff EEnneerrggyy 
CCoonnsseerrvvaattiioonn ooff WWaatteerr 
WWaassttee MMaannaaggeemmeenntt 
EEfffflluueenntt TTrreeaattmmeenntt 
SSoolliidd WWaassttee DDiissppoossaall 
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
No MMaannaaggeemmeenntt ((BBuussiinneessss aass UUssuuaall))
CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. 
Srivastava 
January 25-29, 
2010 
CONCLUDING REMARK 
If construction is considered as the mother 
of "Development", the cement industry is 
the grandmother. 
Being the grandmother, she has an 
obligation not only to preach, but practice 
the concept of ‘SHE' and that too 
effectively, economically and elegantly.
THANK YOU

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Cement industries EHS consideration

  • 1. CEMENT INDUSTRIES: EHS CONSIDERATIONS A Presentation By Dr. V.C. Srivastava Assistant Professor, Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee – 247667, India. Email: vimalfch@iitr.ernet.in
  • 2. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 INTRODUCTION  Cement production is yardstick for measurement of civilization and industrialization.  Significant role in providing shelter to mankind, infrastructural development of the nation.  The recent boom in infrastructure and the housing market.  Indian cement industry  first bag of cement was packed in 1914 at Porbundar.  ranks second next only to China  According to a report by the ICRA Industry Monitor, the installed capacity is expected to increase to 186 mt per annum (mtpa) by the end of FY 2008, and 219 mtpa by end of FY 2009, and further up to 241 mtpa by FY 2010- end.  As a result, India's cement industry will record an annual growth at around 10%.
  • 3. Cement consumption 1985-2020E (million t) Continent 1985 2003 2020 % pa growth CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 03-20 Developed countries 323 410.5 475 0.80 % Developing countries 363.7 1202.5 2586.5 4.30 % Total 686.7 1612.9 3061.5 3.60 %
  • 4. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Indian cement industry  Cement consumption per capita  India - 99 kg/capita (one of the lowest)  China - 450 kg/capita.  Japan - 631 kg/capita  World average - 267 kg/capita.  Cement plants in our country have mostly changed from the wet process to the energy efficient dry process.  Indian industry matches quite well with world standards in terms of energy (thermal energy kcal/kg of clinker – India 665 against 690 of Japan) and pollution norms (SPM of 40 in India against 20 of Japan).  The average performance of the Indian industry is lagging behind.
  • 5. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 PROCESS TECHNOLOGY  Alternative technologies: Wet process, Semi-dry process and Dry process.  Major steps in manufacturing  Acquisition and transportation of raw materials  Preparation of raw materials  Pyroprocessing of raw materials to form cement clinker.  Cooling and grinding of clinker with gypsum into cement  Storage and packaging
  • 6. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 ENVIRONMENTAL IMPACT
  • 7. The raw materials for cement production are  limestone or other source of CaCO3 (about 80 to 85% of input),  clay (about 15 to 20% of input),  other (a few % of input) to provide Si, Fe and Al.  One needs approximately 1.5 kg of input material for 1 kg of cement output, the loss of mass being emitted as pollutant.  The fuel energy requirement is around 3700 MJ (1028 kWh) per tonne of clinker. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 8. ENVIRONMENTAL HAZARADS AND MANAGEMENT IN CEMENT INDUSTRIES
  • 9. Environment Pollution due to Cement manufacture Pollution causing activities of cement manufacture  Off Plant pollution  In- plant pollution  Application generated Fugitive emissions CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 10. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Environmental Impact of Cement Manufacture
  • 11. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 INTRODUCTION  Major environmental issues are  dust pollution  emission of Green House Gases (GHG),  ecological concern arising from the degradation of mined-out areas,  noise and transport pollution.  Cement related GHG emissions originate from  fossil fuel combustion at cement manufacturing operation (40%)  transport activities (5%)  combustion of fossil fuel that is required to make the electricity (5%).  Other manufacturing process (about 50%)
  • 12. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 ENVIRONMENTAL ISSUES  Fugitive emissions are quite high in cement industries and requires immediate attention for control.  Continuous dust monitoring system with data logger should be installed by all the cement industries and calibration should be done from time to time.  Pet-coke containing about sulphur is being used as fuel in cement kiln in few units. The SO2 emission vanadium and nickel emission.  It is necessary to frame fuel quality specifications for the cement industries.
  • 13. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 ENVIRONMENTAL ISSUES  Emission standards for particulate matter is quite relaxed in comparision to other countries like USA, Japan, Germany. Need is being felt to revise the emissions standards.  Cement industries have potential to utilise industrial wastes like flyash, blast furnace slag, phosphogypsum. But the present utilization is low and needs to be enhanced.  In Indian cement industries, 40% of total heat input is going as waste heat, which should be utilized for co-generation of power. This is already being practiced in Japan, China & South East Asian Countries.  The need of identifying incinerable hazardous waste for use as fuel in cement kiln is also stressed.
  • 14. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 List of impact categories Type Impact category Unit Spatial Scope Squandering of resources Abiotic resources - Global Biotic resources Year-1 Global/regional Land - Local Pollution Global warming kg CO2-eq. Global Depletion of the ozone layer kg CFC-11 eq. Global Human toxicity kg b.w.a Global/continental/regional/local Aquatic ecotoxicity m3 polluted watera Global/continental/regional/local Terrestrial ecotoxicity kg polluted soila Global/continental/regional/local Photochemical kg C2H4-eq. Continental/regional/local oxidantformation Acidification kg SO2-eq. Continental/regional/local Eutrophication kg P-eq. Continental/regional/local Waste heat MJ Regional/local Odour m3 polluted aira Local Noise Pa2*s Local Affection Ecosystem and landscape m2·s Global/continental/regional/local Death — Local aPolluted to a defined threshold level.
  • 15. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Pollutants Released by Cement Kilns  Carbon dioxide (global warming gas)  Acid Gases, Nitrogen Oxides, Sulfur Dioxide, Particulate Matter  19 heavy metals, including lead, mercury, cadmium and chromium VI  Products of Incomplete Combustion (PICs), including dioxins, furans and Polycyclic Aromatic Hydrocarbons (PAHs) Source: http://www.texascenter.org/publications/kiln.htm
  • 16. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Pollutants Released by Cement Kilns  “Upset” events in cement kilns operation trigger increased emissions from the stack and “fugitive” (non-stack) emissions from the cement kiln itself.  When handling, storing and burning liquid hazardous wastes, fugitive emissions can be released from numerous points at ground level such as the seals on the cement kiln, vents and pressure release valves, the storage tanks, and transfer points from the storage tanks through the pumps and into the rotary kiln.
  • 17. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Dioxin Facts  Dioxins and furans are the most toxic chemicals known to science  Dioxins cause infertility, learning disabilities, endometriosis, birth defects, sexual reproductive disorders, damage to the immune system, cancer and more.  93% of dioxin exposure is from eating meat and dairy products.
  • 18. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 How to make dioxin  Dioxins are created by burning hydrocarbons (fossil fuels, tires, hazardous wastes) with chlorine (present in coal, tires and some hazardous wastes) in the presence of oxygen.  Dioxin emissions increase when: More chlorine is in the fuel/waste stream Certain metal catalysts are present The gases stay in a low temperature range (200- 450o C)
  • 19. • Only generally used for sulfur oxides (SOx), nitrogen oxides (NOx), oxygen (O2), carbonmonoxide (CO) and opacity (indirectly monitoring particulate matter) • Technology now exists to continuously monitor: Ammonia (NH4) Carbon Dioxide (CO2) Hydrogen Sulfide (H2S) Acid Gases: Sulfuric Acid (H2SO4) Hydrofluoric Acid (HF) Hydrochloric Acid (HCl) Products of Incomplete Combustion (PICs): Dioxins & Furans Polycyclic Aromatic Hydrocarbons (PAHs) Volatile Organic Compounds (VOCs) Metals: Antimony (Sb) Arsenic (As) Barium (Ba) Cadmium (Cd) Chromium (Cr) Lead (Pb) Manganese (Mn) Mercury (Hg) Silver (Ag) Nickel (Ni) Zinc (Zn) …and more CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Continuous Emissions Monitors www.ejnet.org/toxics/cems.html
  • 20. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Cement Kiln Dust (CKD)  Large amounts of fine material given off and carried out by flow of hot gas within cement kiln  Collected using pollution control systems like cyclones, electrostatic precipitators, or baghouses, and is then landfilled either on or off site.  Dry process cement kilns generally produce more CKD  Some CKD is “recycled” into the cement product.
  • 21. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 “Beneficial” Uses  Not considered hazardous waste by US EPA  Soil Stabilization  Stabilization and Solidification of Waste  Cement Replacement  Asphalt Pavement  Mine Fill  Crop Enhancer
  • 22. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 What’s in Cement Kiln Dust?  Calcium Oxide  Toxic metals: Arsenic, Chromium, Cadmium, Antimony, Barium, Beryllium, Lead, Silver, Mercury, Thallium, Selenium, Nickel  Dioxin, Furans
  • 23. Cement Kiln Dust More Toxic when CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Burning Hazardous Waste Hazardous Waste Fuels vs. Traditional Fuels  Hazardous Waste either emitted into air, absorbed into CKD, or into clinker (final product)  Using hazardous waste produces 104% more cement kiln dust by volume  Lead concentrations 250% higher  Cadmium concentrations 150% higher  Chromium concentrations 50% higher  Selenium concentrations 100% higher  700 times more dioxin Source: EPA, Report to Congress on CKD, December 1993) Source: Downwinders (http://www.downwindersatrisk.org/DownwindersAtRisk- 100FactsAboutTheIncineration.htm)
  • 24. Cement Industry & Green house Gas (GHG) Emissions  5% of global man-made CO2 emissions  Cement industry's emission of CO2 is next only to thermal power plants (coal based).  The approximate contributions of each of the CO2 sources are:  Calcination 50 - 55%  Fuel combustion 40 - 50%  Electricity 0 - 10%  Total CO2 emissions per tonne of cement (assuming a 0.95:1 clinker to cement ratio) ranges about from 0.85 to 1.15 tonne. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 25. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Limiting CO2 emissions Process modification  Substitution of coal by lower carbon fuels like lignite and natural gas,  Use of washed coal,  Improved kilns,  Use of renewable sources of energy like solar, wind energy also come under this category.  Afforestation and planting of trees in the plants' environs; these act like a "sink" for GHG's.
  • 26. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Limiting CO2 emissions Product modification  Blended cement manufacture  Increased use of pozzolana in concrete. Lower clinker content Increase fuel efficiency Alternative fuels
  • 27. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Improved Waste Management Using Cement Kilns to Manage Waste Problems  High temperature, long residence time  Well controlled process  Can safely process alternative materials with appropriate handling, training and safety procedures  More than 10 million tons of Hazardous Wastes is co-processed in cement kilns annually  Potential use to dispose of off-date pesticides (approx. 500 mil pounds worldwide)  Potential to provide sound disposal option for many wastes in India.
  • 28. HEALTH HAZARADS AND MANAGEMENT IN CEMENT INDUSTRIES
  • 29. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Health Issues The main health hazards which may have implications for health are as follows:  Airborne dust  Noise and vibration  Dangerous atmospheres  Handling of alternative fuels The incidence of such over exposure is generally so low as not to require statistical monitoring or reporting.  No universal industry standard yet exists on monitoring and reporting.
  • 30. Guidelines on Specific Health Issues Airborne Dust  Cement production produces dust that without effective control leads to respiratory disease.  There are some indications of elevated chronic obstructive lung diseases. GOOD PRACTICE  Limit dust levels, and employee exposure.  Appropriate respiratory protection should be worn where work has to be carried out in dusty areas in cement plants.  Various limits exist in different countries  Exposure limits for Respirable Crystalline Silica are now under review. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 31. Guidelines on Specific Occupational Health Issues Noise and Vibration  Main sources of noise are the milling plants used to grind the cement product.  PPE are required for noise levels below 80 dB.  Noise deflectors and improved sound insulation.  Improved noise personal protective equipment  Workers to wear appropriate hearing protection.  Many companies regularly monitor employee auditory functions to ensure this does not exceed natural decline with age. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 32. Guidelines on Specific Occupational Health Issues Noise and Vibration  Whole body vibration is another issue.  Workers driving older heavy mobile equipment can be exposed to vibration.  Modern mobile equipment combine  lower inherent vibration with  damped seating and insulated cabins, reducing the hazard to insignificant levels. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 33. Guidelines on Specific Occupational Health Issues Dangerous Atmospheres  Coal and petroleum coke mill areas, where fine airborne particles can create an explosion hazard.  Kiln and raw mill cyclones and ducting, where un-ventilated process gases could lead to a shortfall of oxygen during maintenance work. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 34. Guidelines on Specific Occupational Health Issues Dangerous Atmospheres Working in Coal/Petroleum Coke Processing Areas  Quantities of coal or coke may self-ignite, if conditions allow, leading to the possibility of bursting into flame  avoid spillages where possible  clean up spillages as soon as they occur.  A mixture of coal dust or coke dust and air is potentially explosive, leading to the possibility of a violent blast  avoid creating dust clouds  remove source of ignition such as glowing coal, sparks, welding, grinding, static, electricity, smoking etc.  Smoking must be strictly forbidden at all times throughout all the coal processing areas CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 35. Guidelines on Specific Occupational Health Issues Environmental Health  Cement-making raw materials do sometimes contain trace amounts of toxic elements such as mercury, thallium, iodine, cadmium and other heavy metals.  Stack emissions are monitored where appropriate for these trace components.  The cement-making process can also lead to trace emissions of POP’s (Persistent Organic Pollutants). CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 36. Guidelines on Specific Occupational Health Issues Handling of Alternative Fuels  Plastics: Recycled plastics are normally used in shredded form and conveyed pneumatically. There can be considerable associated dust requiring eye protection and breathing masks as well as full body clothing, metal silos and ducts need electrical earthing to prevent an explosion hazard. Fire protection is also required, as well as evacuation instruction in the case of fire, as smoke vapours can be toxic. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 37. Guidelines on Specific Occupational Health Issues Handling of Alternative Fuels  Recycled solvents must be rigorously sampled at intake because of variable chemical and physical composition in order to determine health precautions.  Most solvents are toxic and may be flammable. Therefore health precautions are similar to those used in the source industry (e.g. chemical, pharmaceutical) Intake and storage systems must be designed for safe, automated handling, with spill, fire and explosion protection, with an associated emergency plan.  Health procedures require eye protection, breathing masks and full cover clothing.  Used Oils & Oil Emulsions :  Used oils will need to be checked for PCB content that will determine precise precautions required.  Requirements are generally similar to those for solvents, with similar health precautions. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava  Solvents: January 25-29, 2010
  • 38. Guidelines on Specific Occupational Health Issues Handling of Alternative Fuels  Sewage Sludge: While sewage sludge is generally pre-treated there is a possibility of biological infection.  Hence the main emphasis is on avoidance of skin contact and skin protections through use of gloves and appropriate clothing, followed by usual employee hygiene precautions afterwards.  This listing of secondary fuels is indicative only.  In general, rules for handling these and any other materials should be equivalent to those used in the industry from which these are sourced. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 39. Guidelines on Specific Occupational Health Issues Other General Guidelines are:  All operating personnel should have a thorough knowledge of methods for competent operation of the fuel handling systems in normal operation, startup, shutdowns and emergency situations.  Persons handling fuels should be advised of hazards, proper procedures, precautions, health effects and recommendations for emergency treatment.  An emergency plan should adequately address possible emergencies that may arise during transport, storage, handling, and processing.  An emergency shower and eye washing station should be clearly marked and located near the storage areas of liquid and alternative fuels. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 40. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Other possible health risks  Health risks due to vermin and others pests can arise particularly in warmer countries due to unhygienic conditions and due to storage of secondary fuels such as tyres.  Minor quantities of toxic chemicals may also be used in the manufacturing process. These include laboratory chemicals and other cleaning fluids and solvents.  Transformers and capacitors may also contain PCB (Poly-Chloro-Biphenyl) liquids.
  • 41. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Product related health risks  Due to its properties, e.g. the high pH value, the handling of cement has to be done carefully.  Material Safety Data Sheets (MSDS) enable users of cement to take the necessary measures relating to protection of health and safety in the workplace.  Persons placing substances and preparations on the market should ensure that persons, coming in contact with cement, have received appropriate training and use the protective equipment correctly. Special attention has to be paid to  skin protection  eye protection  protection of the respiratory system.
  • 42. SAFETY HAZARADS AND MANAGEMENT IN CEMENT INDUSTRIES
  • 43. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Fatality Analysis A fatality anaylsis data from a number of Cement Sustainability Initiative (CSI) members was collected and analysed. It was found that:  There was a total of 389 Fatalities in ~300,000 employed over (2003-2007) 79% of all fatalities arise from 3 main causes  Traffic & Mobile Plant (43%)  Falls from Heights & Items falling (21%)  Caught in Moving/Starting Equipment (15%)  Others were…
  • 44. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Fatality Analysis
  • 45. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Fatality Analysis Fatalities by Age, hour, day and month, work category  Employee Fatalities peak in 30’s & 40’s  Contractor Fatalities peak in later 40’s & 50’s  Third Party Fatalities peak in the teens  Data collected also show: Highest Peak fatality time is 10am to Noon  More fatalities occur on Monday than on any other day of the week  Peak injury rates occur in January & March, possibly related to cold weather conditions  Drivers account for nearly 50% of the fatalities
  • 46. Conclusion: Fatality Causes & Prevention High Risk Categories: Prevention: Contractors Contractor Safety Management Young/Temporary Employees Special Safety Induction Direct Causes Traffic & Mobile Plant (43%) Driver Training Falls from Heights, Objects falling from Heights (21%) CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Safety Procedures for Work at Heights, Overhead Protection Caught in Starting/Moving Equipment (15%) Plant Isolation Procedures
  • 47. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Lost Time Injury Analysis Typical Injury Causes & Types  Main causes are Slips, Trips and Falls (29%),  Falling or Moving Objects (19%) and  Lifting, Overload and Exertion (18%). These three causes account for 66% of the total accidents.  Most Injuries are to Arms and Hands (32%), Legs and Feet (25%) and Back (13%)  These injuries are 71% of the total
  • 48. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Lost Time Injury Analysis
  • 49.  Most Injuries are to Arms and Hands (32%), Legs and Feet (25%) and Back (13%)  These injuries are 71% of the total  Typical Injury Categories and Ages  Plant Operators (39%) and General Operatives (33%) are the most injury prone.  30-39 is the most injury prone age range (33%), followed by 20-29 (25%), and 40-49 (24%) CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 50. Conclusion on Injury Causes & Prevention Injury Causes: Prevention: Slip, Trips & Falls Housekeeping, clear designated CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 walkways Falling/Moving Objects Guards on Machines and elevated areas Lifting & Overload Manual Handling Training Injury Types Arms and Hands Proper use of Personal Protective Equipment (PPE) Legs and Feet Proper use of PPE Back Injuries Lifting gear, lifts
  • 51. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Good Practices in Safety Mobile Plant  Common hazards associated with the heavy plant (e.g. dumper trucks, front loading shovels, fork lift trucks) used in quarrying and bulk material transport include vehicle impact and twisted ankles during embarking and disembarking.  Incidents can be reduced by  improved driver training,  increasing awareness of the people working alongside these vehicles, and  by using dedicated routes and crossings.  Modern vehicles also offer improved visibility, helping further reduce the risks.
  • 52. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Good Practices in Safety Working at Height  Controls relating to working at height or in confined areas (e.g. Permit-to-work)  Mandatory use of safety equipment (harnesses, safety nets) to properly protect workers from falls, posting of permits.
  • 53. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Good Practices in Safety Slips, Trips and Falls  A nut or bolt falling from a height can kill a person REMEMBER THAT  Keep work places tidy  Use the scrap and dirt bins where provided  Pile material so that it is stable and steady  Put tools and other equipment where they can not possibly fall or be knocked on to someone below.  Clearly mark, fence or cover all openings in floor, roof or ground.  All excavations in the plant should be surrounded with a handrail  When working overhead remove all loose material such as bolts, screws, tools, timbers, fittings, etc. when the job is finished.  Never throw tools or materials, always pass them from hand to hand.
  • 54. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Good Practices in Safety Fire  As a generality, there are few combustible materials in the process equipment in a cement plant, with the exception of conveyor belts.  Several cases of significant conveyor belt fires have arisen, where belt misalignment and/or friction caused heat build-up and subsequent ignition.  Heat detectors may be used at conveyor tension stations, and belts may be purchased made of less/noncombustible material, to lessen the risk of fire. Fire fighting procedures must also be in place.  Electrical cables may also cause or transmit a fire, also with emission of highly toxic smoke.
  • 55. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Good Practices in Safety Fire  Storage of fuels of all types must be in accordance with local fire regulations and good practice.  This applies also to external stockpiles of coal, pet-coke, tyres and the like, where appropriate fire precautions will be required, particularly in hot dry weather.  Storage of waste combustible materials will create a fire hazard.  Proper waste disposal and good housekeeping is the best form of prevention.
  • 56. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Good Practices in Safety Entry into Silos and Confined Spaces  A confined space is any space of an enclosed nature where there is a risk of death or serious injury from hazardous substances or dangerous conditions. The risks in confined spaces arise due to  Lack of oxygen  Poisonous gas, fumes or vapour  Liquids and solids, which can fill the space suddenly  Fire and explosions  Dust  Hot conditions
  • 57. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Good Practices in Safety Avoid entry to confined spaces,  e.g. by doing the work from outside  Blockages can be cleared in silos by use of remotely operated rotating flail devices, vibrators or air purgers  Inspection, sampling and cleaning operations using the right equipment  Remote cameras can be used for internal inspection of vessels If entry is unavoidable, follow a safe system of work  Appointment of supervisor  Cleaning before entry  Check the size of the entrance  Provision of ventilation  Testing the air  Provisions of special tools and lighting  Provision of breathing apparatus
  • 58. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Good Practices in Safety Electrocution  As cement plants are very energy intensive, there will be significant power distribution equipment in all plants.  Electrical maintenance must be conducted on a professional basis. Machine Guarding  Where there is a risk of physical contact with moving parts of work equipment which could lead to injuries,  those parts must be provided with guards or devices to prevent access to danger zones.
  • 59. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Good Practices in Safety Heat Burns  Incidents and injuries resulting in burns arise from contact with hot clinker or cement powder. Hazards are particularly associated with  hot cement kiln dust (CKD), and  dust on preheater systems.  Contact is possible during abnormal operation of the plant, when clearing blockages, carrying out maintenance or in emergency situations.  From contact with combustible materials; oils, scaffold boards, ladders, electrical cabling, etc.
  • 60. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Good Practices in Safety Raw Mill and Preheater Tower: Material in the mill is at temperatures up to 120ºC, in the tower the material can be as hot as 900ºC. Contact is more likely when:  Clearing blockages in the tower where there is the potential for it to flush through the process Hot Clinker: Contact is possible in the:  clinker cooler building  along the clinker pan conveyors  in the clinker dome  along the belts to the cement mills
  • 61. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Good Practices in Safety Precipitator and By-Pass Dust:  access is required to the precipitator hoppers  working on the screws and drag chain conveyors  maintaining the dust transfer pumps Hot Cement: Contact is possible when:  accessing the cement transfer lines  working on the packers  carrying out work on the cement screw conveyors and drag chains
  • 62. Control / Management of the risks  Eliminate the hazard  Reduce the risk at source  Isolate people from the hazard  Control the risk by other means  Protect with the correct PPE Other Good Practices  The use of “high visibility” clothing is strongly recommended particularly under poorer lighting conditions.  Good lighting around cement plants is also a pre-requisite for safety of night-time operation and maintenance activities.  Use of mobile phones should be restricted in areas where inattention could cause serious consequences. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 63. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 Life saving rules  Any person working on equipment with moving parts must personally ensure the equipment is de-energized, isolated and locked/tagged out  Any person working from a position with the potential for a fall of 1.8 meters or more must use fall protection  Any person doing flame welding, cutting or brazing up to 6 meters from any flammable material must obtain a proper hot work permit and apply the requirements  Any person entering a confined space must obtain a proper confined space entry permit and apply the requirements  Prescribed PPE shall always be worn when exposed to open processes or systems (e.g. clearing material blockages, electrical work, etc …)  Using illegal drugs is strictly forbidden on any site - use of alcohol or other legal drugs that can effect personal concentration is discouraged
  • 64. GLOBAL ISSUSE FACING THE CEMENT INDUSTRIES CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010
  • 65. SUSTAINABLE DEVELOPMENT OF CEMENT CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 MANUFACTURE
  • 66. CCOONNCCLLUUSSIIOONN STEPS TOWARDS SUSTAINABLE CEMENT PRODUCTION... IInndduussttrriiaall EEccoossyysstteemm CClleeaanneerr PPrroodduuccttiioonn EEnnvv.. MMaannaaggeemmeenntt HHeeaalltthh MMaannaaggeemmeenntt SSaaffeettyy MMaannaaggeemmeenntt CCoonnsseerrvvaattiioonn ooff EEnneerrggyy CCoonnsseerrvvaattiioonn ooff WWaatteerr WWaassttee MMaannaaggeemmeenntt EEfffflluueenntt TTrreeaattmmeenntt SSoolliidd WWaassttee DDiissppoossaall CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 No MMaannaaggeemmeenntt ((BBuussiinneessss aass UUssuuaall))
  • 67. CEMENT INDUSTRIES: EHS CONSIDERATIONS: Dr. V.C. Srivastava January 25-29, 2010 CONCLUDING REMARK If construction is considered as the mother of "Development", the cement industry is the grandmother. Being the grandmother, she has an obligation not only to preach, but practice the concept of ‘SHE' and that too effectively, economically and elegantly.

Notes de l'éditeur

  1. Metals and dioxins end up in the cement and the cement kiln dust as well as the air.
  2. Note from Dr. Neil Carman: Liquid hazardous waste handling, storage & combustion involves the serious potential for some nasty fugitive hazardous waste VOC emissions during the transfer from tanker trucks to the storage tanks, the storage tanks will also leak fugitives from around their seals in certain cases or from pressure release valves or other vents, leakage from the transfer piping system and the pumps; and also the seals on the cement kiln will leak fugitives from the combustion process especially around the lower hot end of the kiln and these would be even more toxic products of incomplete combustion (PICs) than the pre-combustion VOC fugitives. Fugitive hazardous waste VOC leakage can be a problem for them whether from storage and transfer operations or from the rotary kiln. Dioxins could leak as a fugitive vapor though generally it's the stack dioxin emissions that are revealed by stack tests. The cement kiln's fugitive VOC losses is in part due to inadequate design though any incinerator can have such leaks as well. Cement rotary kilns (50-100+ meters in length) are far larger than rotary incinerator kilns (approximately 10-15 meters); the larger size creates more seal leakage opportunities where fugitive VOC losses can take place. Incinerators will generally be better designed than cement kilns which go through a piece-meal retrofit and this is a greater technical challenge than building a facility from the ground up.
  3. More information on dioxins at the Dioxin Homepage: http://www.ejnet.org/dioxin/
  4. Copper (Cu) is the most potent catalyst for dioxin formation, but Iron (Fe), Zinc (Zn), Potassium (K) and Sodium (Na) have also been found in multiple studies to be correlated with increased dioxin/furan formation. Some studies have also indicated that Manganese (Mn), Magnesium (Mg) and Nickel (Ni) may also serve as catalysts for dioxin formation. See studies here: http://www.ejnet.org/dioxin/catalysts.html “Temperature of the combustion gases (i.e., flue gases) is perhaps the single most important factor in forming dioxin-like compounds. Temperatures between 200° and 450° Celsius (C) are most conducive to forming CDD/CDFs, with maximum formation occurring at around 350°C. If temperature falls outside this range in temperature, the amount of CDD/CDFs formed is minimized.” Pages 2-3 of Part 1, Volume 1, Chapter 2 of U.S. Environmental Protection Agency's "Exposure and Human Health Reassessment of 2,3,7,8-Tetrachlorodibenzo-p-Dioxin (TCDD) and Related Compounds National Academy Sciences (NAS) Review Draft.” http://www.epa.gov/ncea/pdfs/dioxin/nas-review/ http://www.epa.gov/ncea/pdfs/dioxin/nas-review/pdfs/part1_vol1/dioxin_pt1_vol1_ch02_dec2003.pdf Research on the role of chlorine in the fuel/waste stream can also be found in that chapter.
  5. Without continuous emissions testing, no one really knows how much pollution is being released into the air. Corporations like it this way. Infrequent testing makes it easy for them to manipulate test results and look cleaner than they really are. Work to get the local, state or national government to require continuous monitoring. Pressure the corporations directly to provide this. If they refuse, ask "what are you hiding?" Demand that test results be made available immediately on a website and that summaries be published weekly in local newspapers. The U.S. EPA publishes a newsletter that tracks the verification of monitoring technologies. Archives can be found here: http://www.epa.gov/etv/sitedocs/monitor.html
  6. Cement kiln dust (CKD) is the same as what is called “fly ash” in trash incinerators or coal power plants. Recycling of CKD into cement adds toxic metals to the cement. “In 1990, on average 9 tons of this cement kiln dust (CKD) was produced for every 100 tons of clinker.” Source: http://useit.umaine.edu/materials/ckd/general_information.htm See http://useit.umaine.edu/factsheet/fscd.htm for the rest of the CKD profile on the Beneficial Use in Maine site.
  7. Source: Beneficial Use of Solid Waste in Maine (http://useit.umaine.edu/factsheet/fscd.htm)
  8. Calcium Oxide (when mixed with water forms Calcium Hydroxide, also known as hydrated lime) Sources: Material Safety Data Sheet for Ash Grove Durabase CKD. http://www.ashgrove.com/pdf/msds/Durabase.pdf Rachel’s Democracy and Health News #314, “Cement And Kiln Dust Contain Dioxins,” December 02, 1992. http://www.rachel.org/bulletin/bulletin.cfm?Issue_ID=815
  9. While there are known health consequences to over-exposure of any of the occupational health hazards outlined above, the incidence of such over exposure is generally so low as not to require statistical monitoring or reporting.
  10. Health risks due to vermin and others pests can arise particularly in warmer countries due to unhygienic conditions. These can also arise due to storage of secondary fuels such as tyres, where crevices can contain pools of water and provide breeding grounds. Minor quantities of toxic chemicals may also be used in the manufacturing process. These include laboratory chemicals and other cleaning fluids and solvents. Transformers and capacitors may also contain PCB (Poly-Chloro-Biphenyl) liquids. In all cases, management must ensure that adequate training in use of these substances and MSDS (Materials Safety Data Sheets) are provided. In cases where open-loop water cooling tower systems exist (such as in air-conditioning systems), there is a possibility for the occurrence of Legionnaire’s Disease. Regular disinfection of the cooling system will prevent this. In older plants it will be appropriate to check out the possibility for existence of friable asbestos or asbestos-containing materials, and if found to exist, to carry out a risk assessment and appropriate encapsulation, area isolation or remedial measures. Such materials will most frequently be found in ductwork insulation or flexible seals.