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High calcium flyash modified material

A high-calcium fly ash and modified material technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problem of difficult to increase the content of high-calcium fly ash and weaken the Active advantages, poor product performance stability and other problems, to achieve the effect of eliminating hidden dangers of stability, conducive to the development of structural strength, and low cost

Inactive Publication Date: 2007-12-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Solving the stability problem is the key technology to increase the amount of high-calcium fly ash in cement concrete. Generally, methods such as aging, water spraying, chemical excitation, mechanical grinding, and mixing other mineral admixtures are used. However, the existing technical methods The production efficiency is low, such as the aging and water spraying method has a long cycle, weakens the activity advantage of high-calcium fly ash relative to low-calcium ash, high production cost and poor product performance stability; simple chemical excitation and mechanical grinding treatment have a great impact on stability The improvement of the properties is limited; the mixing of other admixtures limits the scope of application, etc.
At the same time, because the hydration activity of high-calcium fly ash itself is significantly lower than other mineral materials such as slag powder and steel slag powder, it is difficult to increase the content of high-calcium fly ash in cement concrete.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of high calcium fly ash modified material, it is made of Fe 2 SO 4 、Na 2 SO 4 , calcined gypsum and calcium carbide slag raw materials, the parts by weight of each raw material are: Fe 2 SO 4 1 part, Na 2 SO 4 3 parts, calcined gypsum 4 parts, carbide slag 2 parts.

[0025] The preparation method of the above-mentioned high-calcium fly ash modified material is: according to the parts by weight of each raw material: Fe 2 SO 4 1 part, Na 2 SO 4 3 parts, calcined gypsum 4 parts, carbide slag 2 parts, select Fe 2 SO 4 、Na 2 SO 4 , Calcined gypsum and calcium carbide slag are mixed to obtain the product.

[0026] The calcined gypsum is obtained by calcining gypsum at a temperature of 750° C. to 850° C., and the gypsum may be natural gypsum, chemical gypsum, or a mixture of natural gypsum and chemical gypsum.

[0027] The calcium carbide slag is industrial waste slag produced from polyvinyl chloride, polyvinyl alcohol or acetylene, which is pre-dr...

Embodiment 2

[0038] A kind of high calcium fly ash modified material, it is made of Fe 2 SO 4 、Na 2 SO 4 , calcined gypsum and calcium carbide slag raw materials, the parts by weight of each raw material are: Fe 2 SO 4 1 part, Na 2 SO 4 4 parts, calcined gypsum 5 parts, carbide slag 2 parts.

[0039] The preparation method of the above-mentioned high-calcium fly ash modified material is: according to the parts by weight of each raw material: Fe 2 SO 4 1 part, Na 2 SO 4 4 parts, calcined gypsum 5 parts, carbide slag 2 parts, select Fe 2 SO 4 、Na 2 SO 4 , Calcined gypsum and calcium carbide slag are mixed to obtain the product.

[0040] The calcined gypsum is obtained by calcining gypsum at a temperature of 750° C. to 850° C., and the gypsum is natural gypsum.

[0041] The calcium carbide slag is industrial waste slag produced from polyvinyl chloride, polyvinyl alcohol or acetylene, which is pre-dried to make the water content lower than 5%.

[0042] With the high-calci...

Embodiment 3

[0044] A kind of high calcium fly ash modified material, it is made of Fe 2 SO 4 、Na 2 SO 4 , calcined gypsum and calcium carbide slag raw materials, the parts by weight of each raw material are: Fe 2 SO 4 2 parts, Na 2 SO 4 3 parts, 4 parts of calcined gypsum, 3 parts of carbide slag.

[0045] The preparation method of the above-mentioned high-calcium fly ash modified material is: according to the parts by weight of each raw material: Fe 2 SO 4 2 parts, Na 2 SO 4 3 parts, calcined gypsum 4 parts, carbide slag 3 parts, select Fe 2 SO 4 、Na 2 SO 4 , Calcined gypsum and calcium carbide slag are mixed to obtain the product.

[0046] The calcined gypsum is obtained by calcining gypsum at a temperature of 750° C. to 850° C., and the gypsum is a mixed gypsum of natural gypsum and chemical gypsum (arbitrary ratio between the two).

[0047] The calcium carbide slag is industrial waste slag produced from polyvinyl chloride, polyvinyl alcohol or acetylene, which i...

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PUM

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Abstract

A modifier of high-Ca powdered coal ash for improving its stability and hydrating activity is prepared from Fe2SO4 (1-3 Wt portions), Na2SO4 (2-4), calcined gypsum (3-5) and carbide slag (2-3).

Description

technical field [0001] The invention relates to a high-calcium fly ash modified material. Background technique [0002] The annual discharge of fly ash in my country is 130 million tons, of which high-calcium fly ash accounts for about 8%. On the one hand, high-calcium fly ash is directly produced by burning lignite and sub-bituminous coal in power plants, and on the other hand, calcium-enriched ash is obtained through calcium-enriched combustion. my country is the first country that has successfully adopted the cyclone furnace calcium-increasing combustion process to utilize low-quality coal. Since the calcium-increasing combustion process can not only make the combustion of low-quality coal stable, but also has the environmental protection effect of sulfur fixation, it is changed to calcium-increasing combustion in China. The number of power plants is gradually increasing, coupled with the large-scale mining of the Dongsheng lignite field in Shenfu, Inner Mongolia, the amo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/00C04B18/06C04B28/00
CPCY02W30/91
Inventor 马保国朱洪波
Owner WUHAN UNIV OF TECH
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