Patent ID: 8864902

Claim:
A method of manufacturing a cement clinker, comprising the steps of: preparing raw materials to achieve, when sintered at 1,350° C. for 90 minutes, a total content of tricalcium aluminate (3CaO.Al 2 O 3 ) and tetracalcium aluminoferrite (4CaO.Al 2 O 3 .Fe 2 O 3 ) calculated by Bogue's formulas of 22 mass % or more and a tricalcium silicate (3CaO.SiO 2 ) content calculated by Bogue's formula of 60 mass % or more and an iron modulus (I.M.) of 1.3 or less; and sintering the raw materials at 1,300 to 1,400° C.