Influencing policy (training slides from Fast Track Impact)
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
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
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.
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.
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
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.
Metals and dioxins end up in the cement and the cement kiln dust as well as the air.
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.
More information on dioxins at the Dioxin Homepage: http://www.ejnet.org/dioxin/
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.
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
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.
Source: Beneficial Use of Solid Waste in Maine (http://useit.umaine.edu/factsheet/fscd.htm)
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
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.
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.