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Auxiliary cementitious material using circulating fluidized bed fly ash and preparation method thereof

A technology of auxiliary cementitious material and circulating fluidized bed, which is applied in cement production and other directions, can solve the problem of difficulty in effectively utilizing circulating fluidized bed fly ash, etc., and achieves elimination of adverse effects, elimination of water demand and workability, and incorporation low volume effect

Active Publication Date: 2022-01-11
SUN YAT SEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an auxiliary cementitious material utilizing circulating fluidized bed fly ash and its preparation method, so as to solve the problem that it is difficult to effectively utilize circulating fluidized bed fly ash in the existing technology

Method used

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  • Auxiliary cementitious material using circulating fluidized bed fly ash and preparation method thereof
  • Auxiliary cementitious material using circulating fluidized bed fly ash and preparation method thereof
  • Auxiliary cementitious material using circulating fluidized bed fly ash and preparation method thereof

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preparation example Construction

[0028] And in order to make above-mentioned auxiliary gelling material, the present invention also provides a kind of preparation method of auxiliary gelling material, such as figure 1 shown, including the following steps:

[0029] Step S1, using a grinding process to grind or separate the corresponding ultrafine circulating fluidized bed fly ash, water demand optimization components and volume stability optimization components; and the particles of ultrafine circulating fluidized bed fly ash Particle size < 17 μm, median particle size D50 = 5 ± 1 μm; particle size of the component optimized for water demand < 10 μm, median particle size D50 = 4 ± 1 μm; median particle size D50 of the component optimized for volume stability = 15~20μm;

[0030] Step S2, preparing a chemical control component, which is a liquid additive with a solid content of 30% to 50%;

[0031] Step S3, uniformly mixing ultrafine circulating fluidized bed fly ash, water demand optimization components, volu...

Embodiment 1

[0043] First of all, use the grinding process to grind or sort ultrafine circulating fluidized bed fly ash with a particle size of <17 μm and a median particle size of D50=5±1 μm, with a particle size of <10 μm and a median particle size of D50=4±1 μm 1μm ultrafine slag powder, limestone powder and tailings slag powder with median particle size D50=15-20μm; secondly, 65% water, 10% triethanolamine acetate, 5% triethylene glycol, 15% nitric acid Calcium and 5% molasses are mixed evenly to make chemical control components; finally, 70% ultrafine circulating fluidized bed fly ash, 15% ultrafine slag powder, 5% limestone powder and 10% tailings powder are evenly mixed , spraying 0.15% of the chemical adjustment admixture on the surface of the particles in a spray manner, thereby obtaining an auxiliary cementitious material utilizing circulating fluidized bed fly ash.

Embodiment 2

[0045] First of all, use the grinding process to grind or sort ultrafine circulating fluidized bed fly ash with a particle size of <17 μm and a median particle size of D50=5±1 μm, with a particle size of <10 μm and a median particle size of D50=4±1 μm 1μm ultrafine pulverized coal furnace fly ash, median particle size D50=15-20μm tailings slag powder; secondly, 70% water, 10% calcium nitrate, 5% triethanolamine acetate, 10% triethylamine Glycol, 5% diethanol monoisopropanolamine are mixed evenly to make chemical control components; finally, 75% ultrafine circulating fluidized bed fly ash, 15% ultrafine pulverized coal furnace fly ash and 10% tailings While the ore powder is uniformly mixed, 0.15% of the chemical adjustment admixture is sprayed on the surface of the particles in a spraying manner, so as to obtain an auxiliary cementitious material utilizing circulating fluidized bed fly ash.

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Abstract

The invention discloses an auxiliary gelling material using circulating fluidized bed fly ash and a preparation method thereof. The auxiliary gelling material comprises 60-80% ultrafine circulating fluidized bed fly ash, The particle size of the fly ash in the circulating fluidized bed is <17μm, and the median particle size D50=5±1μm; 5-20% of the water demand optimization component, the particle size of the water demand optimization component is <10μm, and the median particle size diameter D50=4±1μm; 10-25% of volume stability optimized components, median particle size D50 of volume stability optimized components D50=15-20μm; and 0-0.5% of chemical regulation components, chemical regulation group It is divided into liquid additives with a solid content of 30% to 50%; specifically, the present invention can promote the utilization rate of circulating fluidized bed fly ash as a building material resource, improve its application effect as an auxiliary cementitious material in cement concrete, and effectively The method solves the problem that the current technology is difficult to effectively utilize the fly ash of the circulating fluidized bed.

Description

technical field [0001] The invention relates to the field of auxiliary gelling materials, in particular to an auxiliary gelling material using circulating fluidized bed fly ash and a preparation method thereof. Background technique [0002] Circulating fluidized bed combustion technology is a high-efficiency, low-pollution, clean coal-fired technology developed rapidly in the past two decades, and it has been rapidly promoted and applied in my country. With the promotion and large-scale development of CFB coal-fired technology in China, the emissions of its combustion products are also increasing. Since the combustion temperature of circulating fluidized bed boilers (850°C-950°C) is significantly lower than that of ordinary pulverized coal furnace boilers (up to 1500°C), the difference between circulating fluidized bed fly ash and ordinary pulverized coal furnace fly ash There is a fundamental difference in the formation mechanism, resulting in a large difference in the phy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/26C04B7/24C04B7/153
CPCC04B7/26C04B7/24C04B7/153Y02P40/10
Inventor 赵计辉王栋民王奕仁
Owner SUN YAT SEN UNIV
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