Low cost high throughput cement clinker production

摘要

A wet and dry process for producing cement clinker from basic and acidic raw material components, involving drying, grinding, mixing and thermal treatment stages of preheating, calcining, sintering and cooling, comprises using: (a) a marl raw material having a 0.01-80 mu m to 80.01-2000 mu m particle class ratio of 1.5:1 to 1:9; (b) an acidic raw material component, which is to be ground finely to below 80 mu m size, supplied to the 0.01-80 mu m particle class fraction of the raw material, in addition to the incoming finely ground coal ash, in an amount which ensures a modulus 'n' defined by the relation (1) of 1.1-1.5 in this 0.01-80 mu m particle class fraction and the requisite SM and/or TM of the entire raw material; and (c) limestone, which is to be ground to 40-90% residue on a 80 mu m sieve, supplied to the 80-2000 mu m particle class fraction of the entire raw material in an a mount depending on the requisite KSt II of the raw material. (CaO+MgO+FeO+0.31Fe3O4-0.92Al2O3-0.81Fe2O3)/SiO2) (1) Also claimed are (i) a method of optimising the fractional particle size composition of raw material for cement clinker production; and (ii) a method of producing cement clinker from basic and acidic raw material components.