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High-calcium coal ash cement and preparation method thereof

A high-calcium fly ash and cement technology, which is applied in cement production and other directions, can solve the problems of reducing the strength of volume stabilized cement, and achieve the effects of reducing energy consumption, saving energy consumption and reducing the amount of clinker.

Active Publication Date: 2015-03-11
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the volume stability problem caused by free calcium oxide in high-calcium fly ash (≥ 40%) and the problem of cement strength reduction caused by the increase of the admixture amount

Method used

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  • High-calcium coal ash cement and preparation method thereof
  • High-calcium coal ash cement and preparation method thereof

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preparation example Construction

[0033] The preparation method of high-calcium fly ash cement of the present invention may further comprise the steps:

[0034] 1) Ball milling: Portland cement clinker and desulfurized gypsum are mixed and ball milled to obtain a mixture;

[0035] 2) Mechanochemical excitation treatment: the mixture obtained in step 1) is mixed with high-calcium fly ash, silica fume, water glass and composite activator for ball milling to obtain high-calcium fly ash cement.

[0036] Each component of the high-calcium fly ash cement of the present invention can be subjected to mechanochemical activation treatment through ball milling to dissolve free calcium oxide in the fly ash, thereby solving the problem of volume stability caused by free calcium oxide. Among them, the composite activator (the mixture of triethanolamine and sodium sulfate) can efficiently stimulate the mechanochemical activation treatment under the ball milling condition, and the silica fume and water glass further assist an...

Embodiment 1

[0043] The weight percent of the high-calcium fly ash cement of the present embodiment is composed as follows:

[0044] Portland cement clinker 50%;

[0045] High calcium fly ash 40%;

[0046] Desulfurization gypsum 3.3%;

[0047] Silica fume 5.0%;

[0048] Water glass 1.0%;

[0049] Composite activator (a mixture of triethanolamine and sodium sulfate with a mass ratio of 1:3) 0.7%.

[0050] The preparation method is as follows: 1) Ball milling: first, mill cement clinker and desulfurized gypsum in a roller ball mill for 3 hours, and control the particle size of 300 mesh to be no more than 10%; 2) Mechanochemical excitation treatment: then high calcium fly ash, Silica fume, water glass, and composite activator are added together into a ball mill for 2 hours of ball milling to obtain high-calcium fly ash cement.

[0051] According to the method of GB / T17671-1999, the strength of the cement prepared in this example was tested, and the results are shown in Table 2. It can be...

Embodiment 2

[0053] The weight percent of the high-calcium fly ash cement of the present embodiment is composed as follows:

[0054] Portland cement clinker 40%;

[0055] High calcium fly ash 50%;

[0056] Desulfurization gypsum 3.2%;

[0057] Silica fume 4.9%;

[0058] Water glass 1.0%;

[0059] Compound activator (a mixture of triethanolamine and sodium sulfate with a mass ratio of 1:3) 0.9%.

[0060] The preparation method is as follows: 1) Ball milling: firstly, the cement clinker and desulfurized gypsum are ball-milled in a roller ball mill for 2 hours, and the 300-mesh sieve residue is controlled to be no more than 10%; 2) Mechanochemical excitation treatment: then the high-calcium fly ash, Silica fume, water glass and composite activator were added to the ball mill for 2h ball milling to obtain high calcium fly ash cement.

[0061] According to the method of GB / T17671-1999, the strength of the cement prepared in this example is tested. The results are shown in Table 2. It can be ...

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Abstract

The invention discloses high-calcium coal ash cement and a preparation method thereof. The high-calcium coal ash cement comprises the following components by mass percent: 30-50% of silicate cement clinker, 40-60% of high-calcium coal ash, 3.1-3.3% of desulfurization gypsum, 4.8-5.0% of silica fume, 1.0-1.1% of water glass and 0.7-1.0% of a composite activator, wherein the composite activator is a mixture of triethanolamine and sodium sulfate. According to the high-volume high-calcium coal ash cement provided by the invention, the utilization rate of coal ash can be increased, the consumption of the silicate cement clinker can be reduced, the industrial byproducts-desulfurization gypsum and silica fume are used as the raw materials, and the treatment and recycling requirements of industrial waste residues can be met.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a high-calcium fly ash cement and a preparation method thereof. Background technique [0002] Fly ash is the fine dust collected after pulverized coal is burned in the boiler, and its production accounts for about 1 / 4 of the amount of coal burned. The rapid development of the power industry has led to an increase in the output of fly ash in thermal power plants. Statistics show that in 2013 China's output of fly ash reached 530 million tons, an increase of 2.31% compared to the previous year. Fly ash has become the main source of solid waste in my country. The massive stockpiling of fly ash will not only occupy a large amount of land, but also cause serious environmental pollution. Therefore, realizing large-scale comprehensive utilization of fly ash and turning waste into treasure has become an urgent problem. [0003] Fly ash is mainly composed of sili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26
CPCY02P40/10
Inventor 易龙生霍成立李来顺刘泽军金晶郑中华郑峰王正中洪慧兰
Owner BEIJING GEOENVIRON ENG & TECH
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