Gypsum conversion

Details Gypsum conversion Gypsum conversion

C - Chemistry, Metallurgy

01

D

23/100, 23/99

C01D 5/10 (2006.01) B01J 41/04 (2006.01) C01D 5/00 (2006.01) C01F 11/24 (2006.01)

Patent

CA 1200364

ABSTRACT GYPSUM CONVERSION Gypsum as a byproduct in the manufacture of phosphoric acid is converted into potassium sulphate or sodium sulphate by subjecting an aqueous slurry to anion exchange under acidic conditions. Adding solid potassium chloride to the obtained solution of potassium sulphate causes the latter to crystallize in pure state, the potassium chloride solution recovered after filtering off the crystallized potassium sulphate being used for the regeneration of the anion exchanger.

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