Patent ID: 6264738
Filing Date: 2001-07-24
Classification: C04B,Y02P

Abstract:
A method of producing cement clinker from basic and acidic raw material components including:a. grinding and drying said raw material components,b. mixing the raw material components,c. preheating, calcining, and sintering said raw material components in stages to produce cement clinker, andd. cooling said cement clinker,the improvement comprising:e. grinding the basic raw material components to form a fine grain fraction having a grain size of 0.01 to 80 .mu.m and a coarse grain fraction having a grain size of 80.01 to 2000 .mu.m with a grain size ratio of the fine grain fraction to the coarse grain fraction of 1.5:1 to 1:9; andf. heat treating the acidic raw material components having a grain size below 80 .mu.m in a mixture with the fine grain fraction of said basic raw material components, wherein the proportion of the raw material components fine grain fraction relative to said acidic raw material components is in a range which in the sintering stage is sufficient only for the formation of CS and/or C.sub.3 S.sub.2 and C.sub.2 AS, C.sub.3 A, C.sub.12 A.sub.7 and C.sub.4 FA.