CN101357827A

CN101357827A - Method for producing cement clinker from paper manufacture waste slag mud

Info

Publication number: CN101357827A
Application number: CNA2008101570632A
Authority: CN
Inventors: 缪建通
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-09-23
Filing date: 2008-09-23
Publication date: 2009-02-04

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

A kind of method that adopts the waste sludge from paper mill white clay to produce cement clinker

Technical field

What the present invention relates to is a kind of method that adopts the waste sludge from paper mill white clay to produce cement clinker, belongs to the cement clinker production technical field.

Background technology

At present, domestic is the pulping and paper-making factory of pulping raw material with timber, and the white clay that is produced all recycles after burning basically.And the white clay of the pulping and paper-making factory of non-wood-fiber, except that minority enterprise fully utilized alkali recovery white slime, ground landfill or stacking were just selected by most of enterprises.The chemical recovery system quantity newly-built along with China's enterprises in pulp and paper industry increases, scale enlarges, and the white clay of generation will proportionally increase considerably and accumulate, and comprehensive utilization how to accelerate it just becomes in China's paper industry very distinct issues.Utilizing the white clay replacing lime to produce ordinary Portland cement is one of successful experience of obtaining of alkali recovery white slime comprehensive utilization, and this not only can solve secondary pollution, and can alleviate the load of Wingdale raw material grinding machine, save energy.Once there was enterprise to use white clay and generated cement testing, but because white clay moisture height, white clay oven dry power consumption is big, makes white clay generate the cement loss of capital, just is forced to stop in the experimental phase.As time goes on the improving constantly of bagasse alkaline pulping production capacity, consequent white clay secondary pollution is outstanding day by day, has also wasted a large amount of lime carbonate resources simultaneously.The effective constituent of white clay is Ca (OH) ₂, can be used as calcareous alternative part calcareous raw material.White clay is to rent the agricultural land used to store up as industrial residue always, and meets the rain drop erosion meeting partly run off in the process of storing up, and slag field surface water is caused secondary pollution, does not meet country about comprehensive utilization of resources, the industry policy of developing a circular economy.Use white clay as the raw material of producing cement, both saved the limestone mine resource, prevent again white clay in storage process to second environmental pollution, have very high social benefit and economic benefit.

Summary of the invention

The present invention proposes a kind of method that adopts the waste sludge from paper mill white clay to produce cement clinker.Be intended to the to dissolve white clay of the annual discharging of papermaking, and dissolve slag and flyash are turned waste into wealth, and solve the problem because of environmental pollution that trade waste caused such as white clay and land occupation, can bring business economic benefit preferably simultaneously.

Technical solution of the present invention: it is characterized in that this method comprises following processing step:

One, raw material preparation: in 360,000 tons of grog annual production, the consumption raw material are that 1.6 times of grog are counted 57.6 ten thousand tons; 57.6 mix 100,000 tons of white claies (water ratio about 50%, CaO content about 40%) in ten thousand tons of raw material, be equivalent to 13.57 ten thousand tons of Wingdale raw materials; Wingdale raw material in the raw material account for the raw material weight ratio 73%, count 420,000 tons, useful white clay replaces in the described Wingdale raw material, white clay accounts for 32.3% of Wingdale raw material weight, counts 13.57 ten thousand tons; 28.43 ten thousand tons of the actual incorporations of Wingdale; White clay water ratio wherein is about 50%, behind thin up, sends into biaxial rneader with high pressure slurry pump through shower nozzle and mixes with the raw material powder, replaces the balling-up water, again through the laggard kiln calcining of pan-pelletizer balling-up; 0.125 ton of water of pellet balling-up water/ton raw material is counted 7.2 tons of water;

Two, clinker burning: to be fired to partial melting in the cement kiln be the Portland clinker of main component to obtain with tricalcium silicate, Dicalcium Phosphate (Feed Grade), tricalcium aluminate, tetracalcium aluminoferrite with being placed on after the raw material balling-up.

Advantage of the present invention: the white clay of the annual discharging of the papermaking of dissolving, and dissolve slag and flyash, turn waste into wealth, solve problem because of environmental pollution that trade waste caused such as white clay and land occupation, can bring business economic benefit preferably simultaneously.Processing method is easy, have reduced investment, take up an area of less, go up detective, management is simple, environmental protection is easily up to standard, clinker quality can satisfy local construction needs, to characteristics such as the material property adaptation are strong.

Description of drawings

Accompanying drawing 1 is a process flow sheet of the present invention,

Accompanying drawing 2 is that white clay stirs schema.

Embodiment

One, raw material preparation:, consume 57.6 ten thousand tons in raw material in 360,000 tons of grog annual production; 57.6 mix 100,000 tons of white claies (water ratio about 50%, CaO content about 40%) in ten thousand tons of raw material, 28.43 ten thousand tons of Wingdale incorporations; White clay water ratio wherein is about 50%, behind thin up, replaces the balling-up water, white clay is stirred, again through the laggard kiln calcining of pan-pelletizer balling-up; 0.125 ton of water of pellet balling-up water/ton raw material is counted 7.2 tons of water;

Can also add the clay that accounts for raw material weight 11%, 9% anthracite, 3% irony material, 1% gypsum, 3% grain slag in the raw material, the combination of one or more in them.

Two, clinker burning (prior art): to be fired to partial melting in the cement kiln be the Portland clinker of main component to obtain with tricalcium silicate, Dicalcium Phosphate (Feed Grade), tricalcium aluminate, tetracalcium aluminoferrite with being placed on after the raw material balling-up.

Contrast accompanying drawing 1 makes full use of the waste sludge from paper mill white clay as requested, and its main chemical compositions is Ca (OH) ₂, because white clay is wet row's state, and the sulphur in the white clay, alkali content are higher, so can not adopt the new dry process production technique.As adopt wet process technique, though feasible technically, because of its hear rate is too high, also should not select for use.Unique available production method is exactly the semidrying production technique.

Technical process:

1, raw material preparation: be about to calcareous raw material, clayey raw material cooperate by a certain percentage after fragmentation with the small amounts of correction raw material, levigate and be allocated as composition suitable, measure the uniform raw material of matter.

2, clinker burning: be placed on after the raw material balling-up soon and be fired to partial melting in the cement kiln to obtain thinking the Portland clinker of main component.

Contrast accompanying drawing 2, it is to send into biaxial rneader with high pressure slurry pump through shower nozzle to mix with the raw material powder that white clay is stirred, brown stock chest is used for mud and stirs in advance, and brown stock chest is used for mud and stirs in advance, and the mud of making is supplied No. 1 suction pit and No. 2 suction pit finished product mud; No. 1 suction pit and No. 2 suction pit are used for slurry preparation, and to control the concentration of hydraulic mixture of processing requirement well be 50% free-water; The mud of No. 1 suction pit and No. 2 suction pit preparation was supplied respectively 4 hours, No. 1 suction pit slurrying, and No. 2 suction pit supply takes turns successively, class of No. 2 suction pit mud supply; The concentration of hydraulic mixture of No. 1 suction pit must meet the sprinkling requirement after concentration determination instrument (prior art) is measured, promptly concentration of hydraulic mixture is 50% free-water; The flow of slush pump must be controlled to meet batching to amount, will guarantee that promptly raw material balling-up moisture is at 10-15%; The stirring that No. 1 suction pit and No. 2 suction pit must be forced not stop is because the viscosity of Ca (OH) 2 mud is very big, as not stirring or stir inhomogeneous very easy precipitation.

Directly utilize wet clay wash; Batching accurately; The homogenizing degree and the good evenness of raw material; Burn-ability and reactive good when pellet is calcined in kiln, the clinker quality height; Can all utilize the white clay waste residue; Flow process is simple; Need not increase equipment; The homogenizing degree and the good evenness of convenient operation and management material; Burn-ability and reactive good when pellet is calcined in kiln, the clinker quality height; Can all utilize the white clay waste residue; Flow process is simple; Need not increase equipment; Convenient operation and management.

Claims

1, a kind of method that adopts the waste sludge from paper mill white clay to produce cement clinker is characterized in that this method comprises following processing step:

One, raw material preparation: in 360,000 tons of grog annual production, the consumption raw material are that 1.6 times of grog are counted 57.6 ten thousand tons; 57.6 mix 100,000 tons of white claies (water ratio about 50%, CaO content about 40%) in ten thousand tons of raw material, be equivalent to 13.57 ten thousand tons of Wingdale raw materials; Wingdale raw material in the raw material account for the raw material weight ratio 73%, count 420,000 tons, useful white clay replaces in the described Wingdale raw material, white clay accounts for 32.3% of Wingdale raw material weight, counts 13.57 ten thousand tons; 28.43 ten thousand tons of the actual incorporations of Wingdale; White clay water ratio 50% wherein behind thin up, stirs white clay, send into biaxial rneader with high pressure slurry pump through shower nozzle and mix, replace the balling-up water, again through the laggard kiln calcining of pan-pelletizer balling-up with the raw material powder, 0.125 ton of water of pellet balling-up water/ton raw material is counted 7.2 tons of water;

2, a kind of method that adopts the waste sludge from paper mill white clay to produce cement clinker according to claim 1, it is characterized in that white clay is stirred described in the raw material step of preparation process one is to send into biaxial rneader with high pressure slurry pump through shower nozzle to mix with the raw material powder, brown stock chest is used for mud and stirs in advance, and the mud of making is supplied No. 1 suction pit and No. 2 suction pit finished product mud; No. 1 suction pit and No. 2 suction pit are used for slurry preparation, and concentration of hydraulic mixture is 50% free-water; The mud of No. 1 suction pit and No. 2 suction pit preparation was supplied respectively 4 hours, No. 1 suction pit slurrying, and No. 2 suction pit supply takes turns successively, class of No. 2 suction pit mud supply; The concentration of hydraulic mixture of No. 1 suction pit is 50% free-water, makes it meet the sprinkling requirement; The flow control of slush pump is to guarantee that raw material balling-up moisture is at 10-15%; The stirring that No. 1 suction pit and No. 2 suction pit must be forced not stop is because the viscosity of Ca (OH) 2 mud is very big, as not stirring or stir inhomogeneous very easy precipitation.