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Method for preparing high-strength ceramic wall material from papermaking causticized white mud residues

A technology of causticizing white mud and wall materials, which is applied in the field of preparing new building wall materials, can solve the problems of scarce patent discussion and difficulty in popularization, and achieve saving of cultivated land resources, reduction of burning heat consumption and production costs, and significant application The effect of promoting value

Inactive Publication Date: 2011-05-25
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcining lime in the rotary kiln method, based on the calculation of 125 kg of heavy oil consumption per ton of pulp slag in the causticizing white mud recovery kiln in Finland, the fuel cost for calcination is as high as 300 yuan / ton of lime, which is difficult to promote in my country
A novelty search of domestic and foreign patents found that there are many patents on black liquor treatment for the recovery of wood pulp and papermaking alkali, and few patents on the treatment of straw pulp silicon-containing causticization white sludge

Method used

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  • Method for preparing high-strength ceramic wall material from papermaking causticized white mud residues
  • Method for preparing high-strength ceramic wall material from papermaking causticized white mud residues
  • Method for preparing high-strength ceramic wall material from papermaking causticized white mud residues

Examples

Experimental program
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Effect test

Embodiment 1

[0046] to combine figure 2 , the method for preparing high-strength ceramic wall material from papermaking causticizing white mud slag of the present invention, the steps are as follows:

[0047] Step 1: Put 500kg of wet causticizing white mud slag and 75kg of fly ash into the mixer and stir for 4 minutes. When the mixture is in a uniform state, add 75kg of red brick powder and continue stirring for 3 to 4 minutes. When the mixture is uniformly mixed;

[0048] The second step: put the causticized white mud mixture obtained in the first step directly into the mold of the brick forming machine, pressurize at 10MPa, and obtain a shaped brick with a standard brick size of 240*115*53mm;

[0049] Step 3: Stack the adobe formed in the second step in a well-ventilated yard for about 7 days, until the adobe no longer loses weight and has an initial compressive strength above 1MPa, and can be transported into the kiln for calcination;

[0050] Step 4: Put the adobe obtained in Step 3...

Embodiment 2

[0052] to combine figure 2 , the method for preparing high-strength ceramic wall material from papermaking causticizing white mud slag of the present invention, the steps are as follows:

[0053] Step 1: Put 500kg of wet causticizing white mud slag and 150kg of fly ash into the mixer and stir for 8 minutes. When the mixture is in a uniform state, add 150kg of red brick powder and continue stirring for 4 minutes. The mixture is uniformly mixed;

[0054] The second step: put the causticized white mud mixture obtained in the first step directly into the mold of the brick forming machine, pressurize at 20MPa, and obtain a shaped brick with a standard brick size of 240*115*53mm;

[0055] Step 3: Stack the adobe formed in the second step in a well-ventilated yard for about 7 days, until the adobe no longer loses weight and has an initial compressive strength above 1MPa, and can be transported into the kiln for calcination;

[0056] Step 4: Put the adobe obtained in the third step...

Embodiment 3

[0058] to combine figure 2 , the method for preparing high-strength ceramic wall material from papermaking causticizing white mud slag of the present invention, the steps are as follows:

[0059] Step 1: Put 500kg of wet causticizing white mud slag and 75kg of fly ash into the mixer and stir for 4 minutes. When the mixture is in a uniform state, add 75kg of burnt clay and continue stirring for 3 minutes. At this time, mix The material is uniformly mixed;

[0060] The second step: put the causticized white mud mixture obtained in the first step directly into the mold of the brick forming machine, pressurize at 15MPa, and obtain a shaped brick with a standard brick size of 240*115*53mm;

[0061]Step 3: Stack the adobe formed in the second step in a well-ventilated yard for about 7 days, until the adobe is no longer reduced in weight and has an initial compressive strength above 1MPa, and can be transported into the kiln for calcination;

[0062] Step 4: Send the adobe obtaine...

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Abstract

The invention discloses a method for preparing a high-strength ceramic wall material from papermaking causticized white mud residues. The method comprises the following steps of: (1) adding papermaking causticized white mud residues and fly ash to a forced mixer, stirring, after the papermaking causticized white mud residues and fly ash are uniformly mixed, adding red brick powder or fired clay to the forced mixer, and uniformly stirring to obtain a mixture; (2) by selecting a brick former, adding the mixture obtained in the step (1) to a former die to obtain formed brick blanks; (3) piling the formed brick blanks in a stock yard with favorable ventilation conditions for dewatering and solidification until the brick blanks have constant quality and initial compression strength over 1 MPa;and (4) and conveying the dewatered and solidified brick blanks into a brick kiln for calcining, keeping the temperature and cooling in the kiln to a room temperature so as to obtain the high-strength ceramic wall material. The method provided by the invention is favorable for greatly decreasing the water content of the causticized white mud residues before calcination and decreasing the burning heat consumption and the production cost, a formed test piece can be easily and practically calcined in a low-cost common brick kiln, and a ceramic wall material which has high higher compression strength and can substitute clay bricks can be obtained through selecting suitable parameters for the calcination process.

Description

technical field [0001] The invention belongs to the field of resource utilization of inorganic solid waste, in particular to a method for preparing a new type of building wall material by utilizing industrial waste slag-papermaking causticizing white mud slag. Background technique [0002] my country is a big country in pulping and papermaking. At present, chemical pulping methods are used. Chemical pulping (divided into caustic soda method and sulfite method) is to use various chemicals to dissolve most of the lignin in plant fiber raw materials under specific conditions. Come out to disperse into pulp. The caustic soda method is mainly used to produce some grass pulp, such as rice straw, asparagus, reed and so on. The sulfite method is mainly used to produce wood pulp, and is also used to make bamboo pulp and straw pulp. The chemical pulping method, no matter what kind of raw material is used, will produce black liquor, which contains a large amount of spent alkali and or...

Claims

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Application Information

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IPC IPC(8): C04B33/00C04B33/132
CPCY02P40/60
Inventor 崔崇江金国丁锡锋张士华陈光孙章鳌崔晓昱
Owner NANJING UNIV OF SCI & TECH
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