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Method and system for producing aluminum hydroxide using fly ash

A technology of aluminum hydroxide and fly ash, applied in chemical instruments and methods, preparation of alkali metal aluminate/aluminum oxide/aluminum hydroxide, aluminum compounds, etc., can solve the problem of uneven particle size and different particle sizes problems, to achieve the effect of reducing large and fine particles of aluminum hydroxide, uniform particle size, and easy process control

Active Publication Date: 2019-05-10
DATANG INT HIGH ALUMINA COAL R & D CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the particle size of aluminum hydroxide is difficult to control when carbon is divided, the particle size is different. After using aluminum hydroxide as the seed of the seed system, the particle size of the product is still different. When the particle size grows to a certain extent, the crystal Burst into finer particles resulting in uneven product size

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  • Method and system for producing aluminum hydroxide using fly ash
  • Method and system for producing aluminum hydroxide using fly ash

Examples

Experimental program
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Embodiment 1

[0039] like figure 1 As shown, the method for producing aluminum hydroxide using fly ash in the present embodiment is carried out using the sodium aluminate solution produced by the sintering method using fly ash. The alumina content of the sodium aluminate solution is 70g / L, and the specific steps are as follows:

[0040]The above-mentioned sodium aluminate solution enters the seed sub-system by washing the first vertical disc filter with washing liquid, and performs cyclone separation on the discharge of the seed sub-system to obtain the first overflow and the first underflow; make the first overflow A part of the above-mentioned first vertical disc filter enters the sorting system for sorting after filtering through the above-mentioned first vertical disc filter, and the concentration of aluminum hydroxide in the sorting system is 100g / L, and the concentration of aluminum hydroxide in the first underflow is 400g / L; Simultaneously, Make another part in the first overflow ent...

Embodiment 2

[0044] The method of utilizing fly ash to produce aluminum hydroxide of the present embodiment utilizes fly ash to carry out by the sodium aluminate solution that sintering method produces, and this sodium aluminate solution alumina content is 80g / L, and concrete steps are as follows:

[0045] The above-mentioned sodium aluminate solution enters the seed sub-system by washing the first vertical disc filter with washing liquid, and performs cyclone separation on the discharge of the seed sub-system to obtain the first overflow and the first underflow; make the first overflow A part of the above-mentioned first vertical disc filter enters the seed separation system to carry out the seed separation, the concentration of aluminum hydroxide in the seed separation system is 150g / L, and the concentration of aluminum hydroxide in the first underflow is 450g / L; Simultaneously, Make another part in the first overflow enter the carbon separation system after being filtered by the second v...

Embodiment 3

[0049] The method of utilizing fly ash to produce aluminum hydroxide of the present embodiment utilizes the sodium aluminate solution that fly ash is produced by sintering method to carry out, and this sodium aluminate solution alumina content is 90g / L, and concrete steps are as follows:

[0050] The above-mentioned sodium aluminate solution enters the seed sub-system by washing the first vertical disc filter with washing liquid, and performs cyclone separation on the discharge of the seed sub-system to obtain the first overflow and the first underflow; make the first overflow A part of the above-mentioned first vertical disc filter enters the seed separation system to carry out the seed separation, the concentration of aluminum hydroxide in the seed separation system is 200g / L, and the concentration of aluminum hydroxide in the first underflow is 500g / L; Simultaneously, Make another part in the first overflow enter the carbon separation system after being filtered by the secon...

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Abstract

The invention provides a method and system for producing aluminum hydroxide by utilizing coal ash. The method comprises the following steps: 1) enabling a sodium aluminate solution to enter a seed precipitation system via a first vertical disc filter machine to perform the seed precipitation; 2) performing hydrocyclone separation for the material discharged from the seed precipitation system, and obtaining first spillover and first underflow; 3) filtering one part of the first spillover by virtue of the first vertical disc filter machine, and enabling the part of the first spillover to enter the seed precipitation system to perform the seed precipitation; 4) enabling the other part in the first spillover to enter a carbon separation system after being filtered by a second vertical disc filter machine, and enabling the sodium aluminate solution to enter the carbon separation system to perform the carbon separation by virtue of the second vertical disc filter machine; 5) settling the material discharged from the carbon separation system, and obtaining second spillover and second underflow; and 6) enabling the first underflow to enter a flat plate filter machine to be filtered after being filtered and a third vertical disc filter machine, and obtaining an aluminum hydroxide product. The aluminum hydroxide product obtained by the method is uniform in size fraction distribution.

Description

technical field [0001] The invention belongs to the technical field of extracting alumina from fly ash, in particular to a method and system for producing aluminum hydroxide by using fly ash. Background technique [0002] Fly ash is a powdery solid waste collected by a dust collector after coal is burned, and it is the main waste of coal-fired power plants. In recent years, technical research and industrial exploration of extracting alumina from fly ash, especially high-alumina fly ash, have been carried out, among which the extraction of alumina by pre-desilication-soda lime sintering has achieved industrial production. The process of extracting alumina by pre-desilication-soda lime sintering method is as follows: firstly, the fly ash is pretreated; Low, resulting in a low concentration of alumina in the dissolved sodium aluminate solution, usually 70-90g / L, which is far lower than the 120g / L sodium aluminate concentration of the current bauxite sintering method to produce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14
CPCC01F7/142C01P2004/61
Inventor 许学斌孙俊民陈婕胡剑洪景南
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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