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gypsum yield of 99% and the weight ratio between the limestone and sulfuric acid entering the reactor is in kilograms. the residence time in the reactor was minutes 2.1.2 reaction mechanism the reaction mechanism for the formation of gypsum from limestone and sulfuric acid.industrial formation of gypsum from sulphuric acid making gypsum from limestone and sulfuric acid. calcium carbonate and sulphuric acid react to form gypsum.sulphuric. materials and construction materials. model making, medical food.