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Thermal insulation material containing desulphurization sludge and preparation thereof

A technology of desulfurization sludge and thermal insulation materials, applied in the field of thermal insulation materials, can solve problems such as soil hazards, neglect of heavy metal hazards, unfavorable treatment, etc., and achieve the effect of large market space, good market prospects, and low cost

Inactive Publication Date: 2019-11-08
ZHENGZHOU HENGBO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since desulfurization sludge contains harmful substances such as heavy metals, heavy metals will be introduced into the soil when used as a soil conditioner, which will cause harm to the soil and is not conducive to subsequent treatment.
[0004] The above desulfurization sludge recycling methods have their own limitations, and there are problems such as ignoring the hazards of heavy metals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] A kind of preparation that contains the insulation material of desulfurization sludge, its steps are as follows:

[0020] (1) The components are mixed, stirred and extruded;

[0021] (2) Warm the molded insulation material for 14-21 days at a pH of 10-12 and a temperature of 30-40°C.

[0022] The present invention is based on the fact that in alkaline conditions, under the catalysis of magnesium hydroxide, substances such as alumina and silicon dioxide in fly ash can chemically react with calcium sulfate, calcium carbonate and water in desulfurization sludge to generate silicon After that, under the catalysis of magnesium hydroxide, geopolymers are further generated, and the porosity is low, so that the heavy metals in the desulfurization sludge are sealed and solidified; cement improves the strength of geopolymers , wear resistance and corrosion resistance.

Embodiment 1

[0024] An insulating material containing desulfurized sludge is composed of the following raw materials in weight percentage: 32.8% of desulfurized sludge, 18% of fly ash, 23% of cement, and the rest is water.

[0025] The preparation method of the thermal insulation material containing desulfurization sludge is as follows: firstly mix and stir each component, then extrude it with unburned brick equipment, and warm it for 14 days under the condition of pH value of 10 and temperature of 30°C.

Embodiment 2

[0027] An insulating material containing desulfurized sludge is composed of the following raw materials in weight percentage: 48% of desulfurized sludge, 34% of fly ash, 34% of cement, and the rest is water.

[0028] The preparation method of the heat preservation material containing desulfurization sludge is as follows: firstly mixing and stirring each component, then extruding it with unburned brick equipment, and warming it for 21 days under the conditions of pH value 12 and temperature 40°C.

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PUM

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Abstract

The invention relates to a thermal insulation material containing desulphurization sludge and preparation thereof. The thermal insulation material includes the following components: desulphurization sludge, fly ash, cement, and water. The thermal insulation material and the preparation thereof utilize waste fly ash that is common in coal-fired power plants as a blending agent, a prepared low polymer has wear resistance and thermal insulation properties and can be used as the thermal insulation material, desulfurization activated sludge and the fly ash are changed into valuables, resource utilization of waste substances is achieved, requirements of national policies are satisfied, industrial utilization of industrial waste materials is achieved, and a market prospect is good.

Description

technical field [0001] The invention relates to solidification of desulfurized sludge into a thermal insulation material. Background technique [0002] At present, the most widely used flue gas desulfurization process in coal-fired power plants is mainly the wet limestone-gypsum method. Using wet desulfurization method to treat flue gas will produce more desulfurization sewage, and then a large amount of desulfurization sludge. In recent years, the discharge of desulfurization sludge has been increasing day by day, and a large amount of desulfurization sludge has seriously restricted the development of enterprises and caused serious harm to the environment and ecology. Desulfurization sludge has the characteristics of high salinity, high water content, high viscosity, large volume, and is not easy to dehydrate. It is unstable, contains water ash, unreacted calcium carbonate, alumina and silica, and Hg, As, Cd, Cr , Pb, Ni, Zn, Cu and other heavy metals and fluorine-contain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B40/02C04B18/06
CPCC04B28/006C04B40/02C04B2111/00767C04B2201/50C04B7/00C04B18/08C04B18/064Y02W30/91
Inventor 王冠谷建辉岳会芳
Owner ZHENGZHOU HENGBO TECH