... anhydrous gypsum and CaS04.2H2O, if you want to commercialize the gypsum powder, you should adopt the CaS04.2H2O, after removing ... , after grinding fine, the qualified raw gypsum powder will be sent to boiling furnace to calcine, and the unqualified part will be sent ... to grinder until it's qualified. After calcining, the qualified gypsum powder will be sent to storage or workshop ...