Method for producing cement clinker from paper manufacture waste slag mud

Abstract

The invention relates to a method for producing cement clinker by using papermaking waste residues and white mud, the process steps are as follows: preparation of raw materials: the consumed raw materials are 1.6 times the clinker; the limestone raw material in the raw materials accounts for 73 percent of the raw materials according to the weight ratio, the limestone raw material is replaced by the white mud, and the white mud accounts for 32.3 percent of the weight of the limestone raw material; the white mud is stirred after the dilution by adding water, then the white mud is sent to a dual-shaft stirring machine via a nozzle by using a high-pressure slurry pump to be mixed with raw material powder, thereby replacing the water for ball shaping, then the mixture is pelletized by a ball shaping disk and then enters a kiln for calcination; the clinker is calcinated; the raw materials are arranged in the cement kiln after the ball shaping for calcination till part of the raw materials are melted, thereby obtaining the silicate cement clinker which takes tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite as main ingredients. The method has the advantages that: the white mud replaces the limestone raw material which accounts for 32.3 percent by weight, thereby solving the problems of the environmental pollution and the land occupation caused by the white mud wastes; the method is simple, the drying is not used, the drying investment is saved, the clinker quality can meet the requirements, and the adaptability to the performances of the raw materials is strong.

Description

technical field [0001] The invention relates to a method for producing cement clinker by using papermaking waste slag white mud, and belongs to the technical field of cement clinker production. Background technique [0002] At present, domestic pulp and paper mills that use wood as raw material for pulping basically produce white mud that is recycled after burning. The lime mud of pulp and paper mills that are not wood fibers, except for a few enterprises that comprehensively utilize alkali recovery lime mud, most of them just choose landfill or pile up. With the increase in the number and scale of new alkali recovery systems in my country's pulp and paper enterprises, the lime mud produced will increase and accumulate in a large proportion. How to speed up its comprehensive utilization has become a very prominent problem in my country's paper industry. Using white mud instead of lime to produce ordinary Portland cement is one of the successful experiences of comprehensive ...

AI Technical Summary

Problems solved by technology

It aims to absorb the lime mud discharged every year by papermaking, as well as slag and fly ash, turn waste into treasure, solve the problems of environmental pollution and land occupation caused by industrial waste such as lime mud, and at the same time bring better business economic benefits

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