Process method of comprehensive utilization of fly ash

A process method and technology of fly ash, applied in chemical instruments and methods, wet separation, magnetic separation, etc., to achieve the effects of good wear resistance, significant economic and social benefits, and cost reduction

Inactive Publication Date: 2016-08-24
CHIFENG JINHUI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, fly ash is mainly used to produce fly ash cement, fly ash brick, fly ash silicate block, fly ash aerated concrete, etc.; the research on fine comprehensive utilization of fly ash is still in its infancy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: A process method for comprehensive utilization of fly ash, which includes the following steps:

[0022] 1) The fly ash and water are mixed and stirred at a weight ratio of 1:3.3 to form a fly ash slurry. The fly ash slurry is sent to a magnetic separator through a pipeline for a rough separation, and the material with higher iron content is roughly separated The slurry is transported into the secondary magnetic separator through a pipeline for selection. After two magnetic separations, a magnetic particle slurry and a demagnetized fly ash slurry are obtained. The magnetic particle slurry is filtered and dried to obtain a magnetic bead product;

[0023] 2) The demagnetized fly ash slurry is sent into the air flotation tank, and the density is less than 1g / cm under the agitation of high-pressure air at the bottom of the air flotation tank 3 The floating beads are fully exposed and floating on the water surface, the floating beads are caught with a mechanical scree...

Embodiment 2

[0027] Embodiment 2: A process method for comprehensive utilization of fly ash, which includes the following steps:

[0028] 1) Mix the fly ash and water at a weight ratio of 1:3 to form a fly ash slurry. The fly ash slurry is sent to a magnetic separator through a pipeline for a rough separation, and the material with higher iron content is roughly separated. The slurry is transported into the secondary magnetic separator through a pipeline for selection. After two magnetic separations, a magnetic particle slurry and a demagnetized fly ash slurry are obtained. The magnetic particle slurry is filtered and dried to obtain a magnetic bead product;

[0029] 2) The demagnetized fly ash slurry is sent into the air flotation tank, and the density is less than 1g / cm under the agitation of high-pressure air at the bottom of the air flotation tank 3 The floating beads are fully exposed and floating on the water surface, the floating beads are caught with a mechanical screen, and the caught f...

Embodiment 3

[0033] Embodiment 3: A process method for comprehensive utilization of fly ash, which includes the following steps:

[0034] 1) Mix the fly ash and water in a weight ratio of 1:4 to form a fly ash slurry. The fly ash slurry is sent to a magnetic separator through a pipeline for a rough separation, and the material with a higher iron content is roughly separated. The slurry is transported into the secondary magnetic separator through a pipeline for selection. After two magnetic separations, a magnetic particle slurry and a demagnetized fly ash slurry are obtained. The magnetic particle slurry is filtered and dried to obtain a magnetic bead product;

[0035] 2) The demagnetized fly ash slurry is sent into the air flotation tank, and the density is less than 1g / cm under the agitation of high-pressure air at the bottom of the air flotation tank 3 The floating beads are fully exposed and floating on the water surface, the floating beads are caught with a mechanical screen, and the caught...

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Abstract

The invention discloses a fly ash comprehensive utilization process method. The process method comprises steps as follows: magnetic beads and floating beads with high value are selected firstly, fly ash slurry after the magnetic beads and the floating beads are selected is put in a pregelatinization reaction kettle, lime milk and a little NaOH are added, the mixture is pregelatinized to form pregelatinized slurry with tobermorite as a main component under the pressure of 0.4-0.6 Mpa at the temperature of 110-130 DEG C, and the pregelatinized slurry is filtered and dried to prepare inorganic chemical filler; and the pregelatinized slurry has secondary gelatinization reaction, lime milk is continuously added, secondary gelatinized slurry containing a large quantity of fibrous xonotlite crystals is generated under the pressure of 2-3 Mpa at the temperature is 220-280 DEG C, and the secondary gelatinized slurry is placed in a mold, dehydrated by a pressing machine and molded to prepare a light calcium silicate board product. The process method is simple to operate, low in cost and pollution-free and has high comprehensive economic benefits.

Description

Technical field [0001] The invention relates to the technical field of resource utilization of fly ash, in particular to a process method for comprehensive utilization of fly ash. Background technique [0002] In recent years, my country’s energy industry has developed steadily, with an annual growth rate of 7.3% in power generation capacity. The rapid development of the power industry has brought about a sharp increase in fly ash emissions. The total amount of fly ash emitted by coal-fired thermal power plants has increased year by year. , By 2010, my country’s fly ash emissions have reached about 200 million tons, which has put tremendous pressure on my country’s national economic construction and ecological environment. On the other hand, my country is a country with limited per capita resource reserves. The comprehensive utilization of fly ash, turning waste into treasure and turning harm into profit, has become an important technical and economic policy in my country’s econom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00B03C1/02B03B5/28
Inventor 季鹏飞尹凤龙
Owner CHIFENG JINHUI TECH
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