Patent ID: 6149724
Filing Date: 2000-11-21
Classification: C04B

Abstract:
A method of producing a calcium sulfoaluminate-containing cement clinker, comprising subjecting a mixture of cement raw materials, to calcining temperatures sufficiently above 1200.degree. C. to assure the consistent coexistent formation of dicalcium silicate and tricalcium silicate in an industrial kiln; said kiln having a preheater; said raw materials being sources of CaO, SiO.sub.2, Al.sub.2 O.sub.3 and SO.sub.3 and being mixed so as to obtain clinker having a content of 20% to 40% of calcium sulfoaluminate, 10% to 30% of dicalcium silicate, at least 1% of tricalcium silicate, at least 1% of anhydrite so as to assure the suppression of the presence of any aluminate apart from calcium sulfoaluminate, and less than 0.5% of free calcium oxide, all percentages being based on the total weight of said clinker obtained.