Process for abstracting earth silicon, oxide of alumina and gallium oxide from high-alumina flying ash

A high-alumina fly ash and silica technology, which is applied in the fields of alumina/aluminum hydroxide, silica, chemical instruments and methods, etc., can solve the problems of undiscovered extraction of gallium oxide, complex production process, and high production cost. Achieve the effect of easy deep desiliconization treatment, reduce flow rate and improve extraction rate

Active Publication Date: 2008-10-15
TSINGHUA UNIV +1
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Problems solved by technology

The production process is complicated, and the material consumption is large, and the production cost is also high
No patented technology for extracting gallium oxide from fly ash has been found so far

Method used

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  • Process for abstracting earth silicon, oxide of alumina and gallium oxide from high-alumina flying ash

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Embodiment Construction

[0041] With reference to accompanying drawing, the method step when the present invention uses is:

[0042]a) Use 15% sodium hydroxide solution and high-alumina fly ash to react in a high-pressure reactor at 120°C for 3 hours and then filter. The filtrate is used as a raw material for preparing white carbon black, and the filter cake is desiliconized fly ash .

[0043] b) Feed CO into the filtrate at 70°C 2 The reaction was carried out, and when the pH value dropped to 13, the aeration was stopped. After the filtrate was left to stand for 30 minutes, the precipitate produced was removed, and CO was continuously passed through the filtrate at the same temperature. 2 until the solution is fully gelled. C) filter the mixed system of gel and solution, the sodium carbonate solution after filtering is the desilication mother liquor, according to the Na in the desilication mother liquor 2 O is added into milk of lime at a molar ratio of 1:1 and causticized at 95°C. After the NaO...

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Abstract

A method for extracting silicon dioxide, alumina and gallium oxide from high-alumina fly ash relates to the technology fields of environmental mineralogy and material, chemical industry and metallurgy. The method comprises the main steps as follows: causing the high-alumina fly ash to react with sodium hydroxide solution; filtering the solution; introducing CO2 to the filtrate for full gelation; cleaning, purifying, drying, grinding and calcining the silica gel after gel filtration to obtain finished white carbon black; adding limestone and a sodium carbonate solution into the filter mass after the reaction and filtration of the high-alumina fly ash and the sodium hydroxide solution; ball grinding the mixture into raw slurry; dissolving out the clinker obtained by baking the raw slurry; subjecting the filtrate to deep desiliconization to obtain sodium aluminate extraction liquid; filtrating the sodium aluminate extraction liquid after subjecting the sodium aluminate extraction liquid to carbon dioxide decomposition; baking the aluminum hydroxide after washing the filter mass to form the aluminum hydroxide product; and extracting the gallium oxide from the carbon dioxide decomposition mother solution and desiliconized solution. The method has the advantages of low material price, simple operating procedures, low investment, low production cost, low energy consumption and less slag.

Description

technical field [0001] The invention relates to the technical fields of environmental minerals and materials, chemical industry and metallurgy, in particular to a method for extracting silicon dioxide, aluminum oxide and gallium oxide from high-alumina fly ash. Background technique [0002] With the country's increasing demand for metallurgical-grade alumina and the decreasing reserves of bauxite in my country, it is necessary to use aluminum-containing mineral resources such as fly ash and coal gangue produced by human activities to replace natural bauxite to produce alumina, etc. Industrial products, and the formation of a coal-electricity-metallurgy circular economy industrial chain, has increasingly attracted people's attention. Chinese patents in the prior art, Patent No. 03131079.6 "A method for preparing alumina and cement clinker by using fly ash" and Patent No. 200410090949.1 "Using fly ash and limestone to jointly produce alumina and cement. "Both invention patents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/113C01F7/02C01G15/00
Inventor 孙俊民姚强张战军张晓云刘刚曹慧芳王彦武
Owner TSINGHUA UNIV
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