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Mixed calcined cement admixture being produced through utilizing papermaking white mud, shale and coal gangue

A paper-making white mud and mixed material technology, which is applied in the field of Portland cement, can solve the problems of non-wood pulp paper-making white mud industrialization without precedent, occupying large land resources, and difficult to promote economic benefits.

Inactive Publication Date: 2013-02-27
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] my country has become a big country of paper production, consumption, and import. Paper production and consumption account for 23.3% and 23.1% of the world's total respectively. Such a large paper production will inevitably cause a large amount of papermaking white mud waste. At present, a large Most enterprises use landfill or stacking to dispose of paper-making white mud. Although landfill treatment is simple and easy and requires less investment, it requires a large amount of land resources. In addition, due to compaction, rainfall and microbial decomposition during the sludge landfill For reasons such as high-concentration leachate and the dissolution of residual alkali will be produced, causing groundwater pollution
The long-term accumulation of white mud yards still has the risk of collapse under severe weather conditions, which has become a hidden danger of social harm
[0006] Looking at the research and development of comprehensive utilization of lime mud at home and abroad in recent years, there are still various technical obstacles in the comprehensive utilization of lime mud for pulping and papermaking, or it is difficult to popularize due to the influence of economic benefits, especially the industrialization of non-wood pulp and papermaking lime mud There is little precedent for promotional apps

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1 According to the chemical composition analysis of white mud, shale, and coal gangue and the measurement results of the calorific value of coal gangue, the Ca / Si molar ratio is 1.2 as the ratio of white mud and shale, and the coal gangue is 30% of the total mass. % for batching, mixing evenly and aging for 24 hours, the moisture content is 11.5%, then the mixture is molded under the pressure of 3-5MPa, dried for 6 hours, and then heated up to 1000℃ in the high temperature furnace at a heating rate of 5℃ / min , and keep it warm for 30 minutes, and then rapidly cool to ambient temperature to make a composite material. According to the requirements of GB / T12957-2005 "Industrial Waste Residue Activity Test Method for Cement Admixtures", grind the admixture in a small test mill for about 30 minutes, and grind until the sieve residue of 80 μm square hole is 1-3%. The mixed material is mixed into Portland cement at a ratio of 30%, and then mixed with 5% gypsum to make ...

Embodiment 2

[0014] Example 2 According to the chemical composition analysis of lime mud, shale, and coal gangue and the calorific value measurement results of coal gangue, the Ca / Si molar ratio is 1.6 as the ratio of white mud and shale, and coal gangue is 30% of the total mass. % for batching, mixing evenly and aging for 24 hours, the moisture content is 13.3%, and then the mixture is molded under the pressure of 3-5MPa, dried for 6 hours and then heated to 1000℃ in the high temperature furnace at a heating rate of 5℃ / min , and keep it warm for 30 minutes, and then rapidly cool to ambient temperature to make a composite material. According to the requirements of GB / T12957-2005 "Industrial Waste Residue Activity Test Method for Cement Admixtures", grind the admixture in a small test mill for about 30 minutes, and grind until the sieve residue of 80 μm square hole is 1-3%. The mixed material is mixed into Portland cement at a ratio of 30%, and then mixed with 5% gypsum to make a sample. T...

Embodiment 3

[0015] Example 3 According to the chemical composition analysis of lime mud, shale and coal gangue and the calorific value measurement results of coal gangue, the Ca / Si molar ratio is 2.0 as the ratio of white mud and shale, and the coal gangue is 30% of the total mass. % for batching, mixing evenly and aging for 24 hours, the moisture content is 14.4%, then the mixture is molded under the pressure of 3-5MPa, dried for 6 hours, and then heated to 1000℃ in the high temperature furnace at a heating rate of 5℃ / min , and keep it warm for 30 minutes, and then rapidly cool to ambient temperature to make a composite material. According to the requirements of GB / T12957-2005 "Industrial Waste Residue Activity Test Method for Cement Admixtures", grind the admixture in a small test mill for about 30 minutes, and grind until the sieve residue of 80 μm square hole is 1-3%. The mixed material is mixed into Portland cement at a ratio of 30%, and then mixed with 5% gypsum to make a sample. T...

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PUM

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Abstract

The invention discloses a mixed calcined cement admixture being produced through utilizing papermaking white mud, shale and coal gangue. The cement admixture is obtained through mixing waste papermaking white mud, shale with rich reserves and coal gangue with low prices according to a certain ratio, aging, forming, drying, calcining and cooling. The pozzolanic activity of the cement admixture is equivalent to that of second-level pulverized fuel ash, and the cement admixture can be used for partially or completely substituting for pulverized fuel ash or other cement admixtures. According to the mixed calcined cement admixture produced through solid wastes of the papermaking white mud and the like, the cement performance is improved, energy is saved, emission is reduced, wastes are turned into wealth, the environmental protection is benefited, moreover, the cement admixture is low in production cost and considerable in profit, the increasing shortage situation of the cement admixture can also be relieved, and obvious social benefit and economic benefit are obtained.

Description

technical field [0001] The invention specifically relates to a cement admixture made by co-firing papermaking white mud, shale and coal gangue, and belongs to the technical field of portland cement. Background technique [0002] The production of cement consumes a lot of energy and mineral resources such as limestone and clay, and also discharges a lot of pollutants. At the same time, the discharge of industrial waste residues (fly ash, blast furnace slag, coal gangue, papermaking lime mud, etc.) has increased year by year, which not only occupies a large amount of land, but even pollutes water sources, air, and soil, bringing great harm to economic construction and people's lives. Great harm. A large number of research results show that the use of industrial waste residues as cement admixtures not only effectively utilizes industrial waste residues, reduces environmental pollution and land occupation caused by waste residues, reduces cement production costs, but also reduc...

Claims

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Application Information

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IPC IPC(8): C04B7/30
CPCY02P40/10
Inventor 刘来宝张礼华周永生郑爱中曹加均
Owner SOUTHWEAT UNIV OF SCI & TECH
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