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In the chemically pure form, gypsum contains 2328% calcium (Ca) and 1862% sulfur , that use gypsum includes blackboard chalk, cement, wallboard, Plaster-of-Paris, , rates between 500 to 2,000 lb of gypsum per acre for this purpose
Gypsum is called the retarding agent of cement which is mainly used for regulating the setting , Gypsum plays a very important role in controlling the rate of hardening of the cement , How do I set up a gypsum powder processing factory?
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical , The word gypsum is derived from the Greek word γύψος (gypsos), "plaster" Because the quarries of the , "The role and implications of bassanite as a stable precursor phase to gypsum precipitation" Science 336 (6077): 69–72
Cement mixed with water and sand, forms cement plaster , However, there are some general-purpose cements, the commonest one being Portland , ground with a small amount of gypsum into a powder to make 'Ordinary Portland Cement,'.