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Method for separation and utilization of fly ash aluminum-silicon, and tobermorite and silicon oxide obtained through method

A technology for separation of tobermorite and aluminum silicon, which is applied in the direction of silicon oxide, silicon dioxide, calcium/strontium/barium chloride, etc., can solve the problem of low added value of aluminum extraction from fly ash, and achieve the goal of increasing added value Effect

Active Publication Date: 2015-07-29
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect of low added value of fly ash to extract aluminum in the prior art, and provide a method for separating and utilizing fly ash, aluminum and silicon

Method used

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  • Method for separation and utilization of fly ash aluminum-silicon, and tobermorite and silicon oxide obtained through method
  • Method for separation and utilization of fly ash aluminum-silicon, and tobermorite and silicon oxide obtained through method
  • Method for separation and utilization of fly ash aluminum-silicon, and tobermorite and silicon oxide obtained through method

Examples

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Embodiment 1

[0059] This example is used to illustrate the method for the separation and utilization of aluminum and silicon in fly ash of the present invention.

[0060] (1) Grind fly ash to 250 mesh, remove iron by magnetic separation, contact with 15% by weight sodium hydroxide solution according to liquid-solid ratio 3:1, react at 110°C for 1 hour, and then separate solid-liquid to obtain sodium silicate desilication liquid and desiliconized fly ash;

[0061] (2) Mix the desiliconized fly ash obtained in step (1) with quicklime and sodium carbonate according to the weight ratio of 1:0.2:1.10 and sinter at 1150°C for 1 hour to obtain clinker. After grinding the clinker to 80 mesh, The adjusting solution is dissolved at 80°C according to the liquid-solid volume ratio of 4:1 to obtain crude sodium aluminate solution and basic calcium silicate. The XRD pattern of basic calcium silicate is shown in figure 2 , Carry out chemical composition analysis to basic calcium silicate, analysis resu...

Embodiment 2

[0066] This example is used to illustrate the method for the separation and utilization of aluminum and silicon in fly ash of the present invention.

[0067] (1) Grind fly ash to 200 mesh, remove iron by magnetic separation, contact with 10% by weight sodium hydroxide solution according to the liquid-solid ratio of 4:1, react at 90°C for 2 hours, and then separate solid-liquid to obtain sodium silicate desilication liquid and desiliconized fly ash;

[0068] (2) Mix the desiliconized fly ash obtained in step (1) with quicklime and sodium carbonate according to the weight ratio of 1:0.25:1.20 and sinter at 950°C for 2 hours to obtain clinker. After the clinker is ground to 50 mesh, The adjusting solution was dissolved at 70°C according to the liquid-solid volume ratio of 3:1 to obtain the crude sodium aluminate solution and basic calcium silicate. The XRD pattern of basic calcium silicate and figure 2 Similar, not listed, the chemical composition analysis of basic calcium sili...

Embodiment 3

[0073] This example is used to illustrate the method for the separation and utilization of aluminum and silicon in fly ash of the present invention.

[0074] (1) Grind the fly ash to 300 mesh, and after removing iron by magnetic separation, contact with 20% by weight sodium hydroxide solution according to the liquid-solid ratio of 5:1, react at 140°C for 0.5h, and then separate the solid and liquid to obtain the sodium silicate Silicon liquid and desiliconized fly ash;

[0075] (2) Mix the desiliconized fly ash obtained in step (1) with quicklime and sodium carbonate at a weight ratio of 1:0.30:1.20 and sinter at 1250°C for 0.5h to obtain clinker, which is ground to 100 mesh, The adjusted solution was dissolved at 90°C according to the liquid-solid volume ratio of 6:1 to obtain crude sodium aluminate solution and basic calcium silicate. The XRD pattern of basic calcium silicate and figure 2 Similar, not listed, the chemical composition analysis of basic calcium silicate is c...

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Abstract

The present invention discloses a method for separation and utilization of fly ash aluminum-silicon. The method comprises: (1) contacting fly ash and an alkaline solution to carry out a pre-desilication reaction, and carrying out solid-liquid separation to obtain a desilication solution and desilication fly ash; (2) mixing the desilication fly ash, quick lime and sodium carbonate, sintering to obtain a clinker, and carrying out dissolution on the clinker to obtain a sodium aluminate crude solution and basic calcium silicate; (3) carrying out desilication, carbonation and calcination on the sodium aluminate crude solution to obtain alumina; and (4) adding the basic calcium silicate to the desilication solution obtained in the step (1), adding lime milk to carry out combined causticization dealkalization, and carrying out solid-liquid separation to obtain the tobermorite and the alkaline solution. The present invention further discloses the tobermorite and the silicon oxide obtained by using the method. With the method of the present invention, the added value of the aluminum extraction of the fly ash is substantially improved.

Description

technical field [0001] The invention relates to a method for separating and utilizing fly ash, aluminum and silicon, and tobermorite and silicon oxide obtained by the method. Background technique [0002] As an inevitable product of coal combustion in thermal power plants, fly ash is the largest single industrial solid waste in China. The resource utilization of fly ash to extract aluminum is not only a great contribution to environmental protection, but also has important strategic significance when China's bauxite resources are about to be exhausted. [0003] The process of extracting aluminum from fly ash is mainly divided into acid method, alkali method, acid-base combined method, and ammonium sulfate method. However, whether it is the acid method or the alkali method, there are problems of less by-products and low added value, which greatly affects the economics of fly ash. Therefore, increasing the added value of fly ash to extract aluminum has become a research hots...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01B33/24C01B33/12C01F11/24B09B3/00
Inventor 肖永丰孙琦王宝冬刘晓婷王晓欢赵利军禹耕之
Owner CHNA ENERGY INVESTMENT CORP LTD
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