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Method for making cement bricks by using pulping alkali to recover green mud and boiler ash

A boiler ash and cement brick technology, applied in the field of cement brick production, can solve the problems of high energy consumption, inability to realize maximum utilization of waste, and low green mud consumption, so as to save cement expenses, improve waste utilization rate, and save The effect of energy consumption

Active Publication Date: 2017-08-25
GUANGXI JINGUI PULP PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite green mud fly ash for concrete uses dry green mud, which consumes a lot of energy to dry the green mud. At the same time, the amount of green mud is low, and it is impossible to realize the maximum utilization of waste.

Method used

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  • Method for making cement bricks by using pulping alkali to recover green mud and boiler ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Weigh the following raw materials in weight percentage: 25% of green mud, 19% of boiler ash, 55% of stone powder and 1% of ordinary Portland cement, and mix the above raw materials to obtain a mixture;

[0024] The water content of described green mud is 70%, and NaOH and Ca(OH) in the green mud 2 The weight content is 4%; The content of fly ash in the boiler ash is 80%, and the slag content is 20%; NaOH and Ca(OH) 2 The weight ratio is 2:1.

[0025] 2) Molding the mixture under a pressure of 40 MPa to obtain bricks.

[0026] 3) Curing the adobe for 28 days to obtain cement bricks.

Embodiment 2

[0028] 1) Weigh the following raw materials in weight percentage: 28% of green mud, 18% of boiler ash, 52.8% of stone powder and 1.2% of ordinary Portland cement, and mix the above raw materials to obtain a mixture;

[0029] The water content of described green mud is 80%, and NaOH and Ca(OH) in the green mud 2 The weight content is 5%; The content of fly ash in the boiler ash is 90%, and the slag content is 10%; NaOH and Ca(OH) 2 The weight ratio is 1:1.

[0030] 2) molding the mixed material under a pressure of 50 MPa to obtain adobe.

[0031] 3) Curing the adobe for 28 days to obtain cement bricks.

Embodiment 3

[0033] 1) Weigh the following raw materials in weight percentage: 26% of green mud, 38% of boiler ash, 35% of stone powder and 1% of ordinary Portland cement, and mix the above raw materials to obtain a mixture;

[0034] The water content of described green mud is 75%, and NaOH and Ca(OH) in green mud 2 The weight content is 4.5%; NaOH and Ca(OH) 2 The weight ratio is 1:2.

[0035] The fly ash content in the boiler ash is 80%, and the slag content is 20%.

[0036] 2) Molding the mixture under a pressure of 45 MPa to obtain bricks.

[0037] 3) Curing the adobe for 28 days to obtain cement bricks.

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Abstract

The invention discloses a method for manufacturing cement bricks from green mud and boiler ash recycled by utilization of pulping alkali. The method is as follows: firstly, the following raw materials are weighed, by weight, 25-30% of green mud, 18-38% of boiler ash, 35-55% of limestone powder and 1-1.5% of cement, the above raw materials are mixed uniformly, and a mixture is obtained; secondly, the mixture is subjected to molding at a pressure of 40-50 MPa, and green bricks are obtained; thirdly, the green bricks are subjected to curing and cement bricks are obtained. The employed green mud does not need dewatering or alkalinity reduction, energy consumption is saved greatly, the brick manufacturing cost is lowered, the green mud doping amount is high, the cement doping amount is lowered than a conventional level, the waste utilization rate is raised greatly, the cement expense is saved, and the brick manufacturing cost is lowered further.

Description

technical field [0001] The invention relates to a method for making cement bricks, in particular to a method for making cement bricks by using pulping alkali to recover green mud and boiler ash. Background technique [0002] In the process of pulping and papermaking, various solid wastes will be produced. If they are not disposed of properly, they will cause great pollution to the environment. Solid waste mainly includes green mud from the alkali recovery workshop and ash from power boilers. Green mud is the waste produced after alkali recovery in the caustic chemical section in the papermaking process, with an alkali content of about 5%, mainly Ca(OH) 2 and NaOH, the water content is as high as 70-80%, or even higher, and the composition of the green mud is complex. The main chemical components and weight contents of the dry base of the green mud are: CaO 40-45%, MgO 3.8-4.2%, NaO 5-6 %, SiO 2 4~6%, Al 2 o 3 1.0~2.0%, K 2 O 0.3~0.6%, Fe 2 o 3 0.5-1.0%, loss on ignit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/04C04B18/08
CPCC04B28/04C04B18/0418C04B18/088C04B18/06C04B14/02Y02W30/91
Inventor 黄再桂
Owner GUANGXI JINGUI PULP PAPER
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