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Stone Quarry Mlimestone In Ghana

Us5169444a - process for preparing calcium sulfate.The process for preparing calcium sulfate anhydrite ii by heating a flowable powder of flue gas gypsum moistened with less than 20 by weight, and preferably with from 7 to 17 by weight, of diluted sulfuric acid, wherein the sulfuric acid content is from 0.5 to 7 by weight, and preferably 1 to 3 by weight of sulfuric acid, based on the.