Method for producing cement clinker by calcining chalk

Abstract

The invention relates to a method for producing cement clinker by calcining chalk, which belongs to the technical field of inorganic nonmetallic materials. The invention takes high moisture content chalk (moisture content of 20-35%) as calcareous raw materials, and is characterized by adopting a dry pre-heating and pre-decomposing technique to calcine the cement clinker, and realizing the organicintegration of three process systems of a raw material drying preparation system, a pre-heating and pre-decomposing system and a clinker calcination system. The method comprises the following steps: (1) the raw material drying preparation system: a drying crusher and a powder concentrator are adopted to dry and sort the prepared chalk raw materials; (2) the pre-heating and predecomposing system: a cyclone preheater and a decomposing furnace system are adopted to preheat and pre-decompose the chalk raw materials, wherein the outlet temperature (600-750 DEG C) of the preheater is adjustable; and (3) the cement clinker calcination system: the predecomposed raw materials enter a rotary kiln system to be calcined into the cement clinker. The invention has the advantages of low comprehensive energy consumption, stable production capacity, high system operation rate and the like.

Description

Technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and particularly relates to a method for calcining cement clinker by using high-moisture (20-35% moisture content) chalk as a calcium raw material and adopting dry preheating and pre-decomposing technology. Background technique [0002] The main component of chalk is CaCO 3 , The use of chalk to produce cement clinker is an important way to use chalk. [0003] Chalk is generally mined underground by an excavator, and the moisture content is generally 20%-35%, and the viscosity is large; but the dry chalk powder itself has a very fine particle size, and the high-moisture chalk can meet the raw material particle size requirements after the drying and crushing system, without the need for traditional ball mills Or vertical mill for grinding. At present, the use of chalk to produce cement clinker mainly adopts wet kiln technology. With the continuous advancement of cement productio...

AI Technical Summary

Problems solved by technology

At present, the production of cement clinker by chalk mainly adopts wet kiln technology. With the continuous progress of cement production technology, energy is increasingly scarce and environmental protection requirements are increasingly strict. The technology of chalk wet kiln production of cement has high energy consumption, large environmental pollution and The shortcomings of small production scale can no longer meet the requirements of modern society for the energy consumption, emission and production scale of cement clinker production lines

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