Patent US4120737 - Manufacture of calcium sulphate alpha .Oct 17, 1978 . A process for the manufacture of calcium sulphate alpha-hemihydrate which comprises the step of interacting an aqueous solution of calcium.calcium sulphate manufacturing process,Patent US5015450 - Process for making calcium sulfate alpha .May 14, 1991 . The process makes calcium sulfate alpha-hemihydrate from finely . in finely divided form for example in phosphoric acid manufacture, it is.
calcium sulphate manufacturing process