Process for the production of alpha hemihydrate calcium...

Details Process for the production of alpha hemihydrate calcium... Process for the production of alpha hemihydrate calcium...

C - Chemistry, Metallurgy

01

F

C01F 11/46 (2006.01) C04B 11/024 (2006.01)

Patent

CA 2167978

Process for producing alpha-hemihydrate calcium sulfate from FGD sludge comprising treating an aqueous slurry of the sludge with a stabilizing effective amount of a stabilizing polyhydric alcohol to stabilize the .alpha.HH to obtain .alpha.HH crystal growth, at atmospheric pressure and a temperature greater than 80°C and a pH selected from 3 to 6. The polyhydric alcohol may be selected from ethylene glycol, glycerol and a carbohydrate. The process offers a commercially viable method of making .alpha.HH from FGD sludge wastes.

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