Process for the production of alpha hemihydrate calcium sulfate

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

1995-01-26

1996-10-08

Langel, Wayne

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

106772, C01F 1146

Patent

active

055628923

ABSTRACT:
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.degree. 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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