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method of grinding and burning gypsum powder

There are four stages in the manufacture of portland cement: (1) crushing andgrindingthe raw materials, (2) blending the materials in the correct proportions, (3)burningthe prepared mix in a kiln, and (4)grindingthe burned product, known as “ clinker,” together with some 5 percent ofgypsum(to control the time of set of the cement).

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