Granulation

造粒 Granulation ,[object Object],[object Object],[object Object],Che5700 陶瓷粉末處理

Direct Granulation Che5700 陶瓷粉末處理 ,[object Object],[object Object],[object Object],[object Object]

Formation of Granule Che5700 陶瓷粉末處理 Can be viewed as nucleation & growth process;  At first, binder solution droplet touch particle  nucleus; capillary force and binder flocculation provide strength ,[object Object],[object Object]

Spray granulation  uniformity closely related to liquid content; Hardness: mostly related to binder (and particle characteristics)

Spray Granulation ,[object Object],[object Object],[object Object]

Spray Granulation 2 ,[object Object],[object Object]

Spray Drying ,[object Object],[object Object],[object Object],[object Object],Che5700 陶瓷粉末處理

Spray Drying (2) ,[object Object],[object Object],[object Object]

Taken from TA Ring, 1996 Droplet/particle: mean residence time ~ 30 sec Three basic steps: (a)atomization, (b)droplet drying, (c) gas-droplet mixing

Spray dried samples: donut particle, temperature rise too fast, surface dried (sealed), vaporization of internal liquid  pores (viscous binder fluid may flow toward inside)

Spraying Drying (3) ,[object Object],[object Object],[object Object],[object Object],[object Object],Che5700 陶瓷粉末處理

Atomization ,[object Object],[object Object],[object Object],Che5700 陶瓷粉末處理 u 1 : interfacial velocity between gas and liquid; D d max = at critical Weber number, largest stable size

Droplet Size ,[object Object],[object Object],[object Object],N v = dimension-less viscosity;

Droplet Drying ,[object Object],[object Object],[object Object],[object Object]

[object Object],----------------

[object Object],Che5700 陶瓷粉末處理

Classification Che5700 陶瓷粉末處理

Principle and Techniques ,[object Object],[object Object],Che5700 陶瓷粉末處理

Taken from TA Ring, 1996; can add some baffles, to separate large particles

Size Selectivity ,[object Object],[object Object],[object Object],[object Object],Che5700 陶瓷粉末處理

取自 TA Ring 1996; Cut size; bypass; Sharpness index b-b’ curve: normal case

Recovery & Yield Che5700 陶瓷粉末處理 ,[object Object],[object Object],[object Object]

phase transformation during calcination Gibbsite, Bayerite Al(OH) 3 ; Boehmite AlOOH Diaspore α-AlOOH

Granulation

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Granulation