hemihydrate gypsum crushing

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Gypsum powder (hydrous calcium sulfate/calcium dehydrate or CaSO4-2H2O) is a white, smooth powder that is derived from heating gypsum stone.When gypsum is heated in air it loses water and converts first to calcium sulfate hemihydrate, (bassanite, often simply called plaster) and, if heated further, to anhydrous calcium sulfate (anhydrite).

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