PRODUCTION OF AATYPE HEMIHYDRATE GYPSUM OF PRISMATIC CRYSTAL FROM PHOS PHORIC ACID BYYPRODUCT DIHYDRATE GYPSUM

摘要

PURPOSE:To easily obtain alpha-type hemihydrate gypsum of prismatic crystal even when the mother liquor is recycled, by preparing gypsum slurry fromphosphoric acid by-product dihydrate gypsum and water, heating, and reacting the slurry while maintaining the pH at specific value in acid side.