METHOD FOR RECOVERING DIHYDRATE GYPSUM FROM WASTE GYPSUM BOARD

摘要

To effectively separate heavy foreign matters from gypsum slurry.CONSTITUTION: A method for recovering dihydrate gypsum from a waste gypsum board includes the steps of: calcining and converting gypsum derived from a waste gypsum board into hemihydrate gypsum grains and/or type III anhydrous gypsum grains; mixing the gypsum grains with water to form gypsum slurry; and removing heavy foreign matters from the gypsum slurry by gravity settling before solid-liquid separation of dihydrate gypsum particles from the gypsum slurry.SELECTED DRAWING: Figure 1