Manufacture of cement

Abstract

Hydraulic cement is prepared by the closed circuit grinding of cement clinker in which the ground material is separated into at least three fractions having different degrees of fineness, two of which fractions have the fineness of ultrafine cement (6000-9000 cm.2/g.) and Portland cement (3000-5000 cm.2/g.), respectively, and are removed as end products, the remaining fraction or fractions being returned for further grinding. Several methods of obtaining the various fractions are described.

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