Method for preparing aluminum-silicon oxide from fly ash

A technology of aluminum silicon oxide and fly ash, which is applied in the direction of aluminum compounds, chemical instruments and methods, silicon oxide, etc., can solve the problems of high corrosion resistance of equipment, large slag production, stagnation, etc., and reduce equipment Investment cost, total by-product reduction, and the effect of reducing the amount of solid waste

Active Publication Date: 2020-09-01
内蒙古蒙泰集团有限公司
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Problems solved by technology

[0003] In recent years, various universities and scientific research institutes in my country have actively carried out the research and exploration of high-alumina fly ash resource utilization technology, mainly to make use of its high-alumina and high-silicon resource endowment, and the extraction of alumina is an important direction for its application , due to the low initial aluminum-silicon ratio of high-alumina fly ash, it cannot be directly used for alumina production
Datang Group has adopted the fly ash pre-desilication-soda lime sintering process to extract alumina, which has been in industrialized operation for many years, but the operation is difficult due to the large amount of slag produced and the high unit cost; Mengxi Group adopts limestone sintering However, the process also stagnated due to the huge amount of slag produced; Shenhua Group conducted a pilot test on the production of alumina from fluidized bed fly ash using the acid process, and there was a problem with the corrosion resistance of the equipment. There are many problems such as high requirements on safety and the inability to comprehensively utilize silicon products such as white mud

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  • Method for preparing aluminum-silicon oxide from fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] 1) Alkali dissolution treatment

[0095] Add the fly ash to the alkali solution, stir and mix well, and dissolve the amorphous silica and alumina in the glass phase in the fly ash in the alkali solution for alkali dissolution treatment; the alkali dissolution treatment process is controlled The temperature in the furnace is 80°C (usually 70-100°C); the ratio of the mass of fly ash to the volume of alkali solution is 1:5 (usually 1:2.5-6), that is, 5ml of alkali solution is used for every 1g of fly ash Or use 500ml alkali solution per 100g fly ash or carry out alkali dissolution treatment with 5L alkali solution per 1kg fly ash; the alkali solution is a mixed solution of sodium hydroxide, sodium carbonate and water, and the concentration of sodium hydroxide in the alkali solution is 100g / L (usually 50-230g / L), the concentration of sodium carbonate is 5g / L (usually 2-20g / L);

[0096] The quality of the fly ash used in the alkali stripping treatment process in this embodi...

Embodiment 2

[0128] 1) Alkali dissolution treatment

[0129] In addition to the chemical composition of the fly ash raw material is as follows: the mass content of alumina is 45.25%; the mass content of silicon oxide is 44.25%, the mass content of iron oxide is 3.16%, the mass content of calcium oxide is 2.57%; the mass content of magnesium oxide The content is 0.86%, and the mass content of phosphorus pentoxide is 0.01%;

[0130] The ratio of the fly ash mass to the volume of the alkaline solution is 1:4.5; the concentration of sodium hydroxide in the alkaline solution is 150g / L (usually 50-230g / L), and the concentration of sodium carbonate is 10g / L (usually 2- 20g / L); the alkali dissolution treatment temperature is 90°C; the alkali dissolution treatment time is 6.0h; the primary alkali dissolution fly ash (85.4g); the primary alkali dissolution solution (389ml); the silicon dioxide concentration in the primary alkali dissolution solution is Except 32.73g / L, all the other are identical w...

Embodiment 3

[0141] 1) Alkali dissolution treatment

[0142] In addition to the chemical composition of the fly ash raw material is as follows: the mass content of alumina is 43.87%; the mass content of silicon oxide is 48.78%, the mass content of iron oxide is 3.49%, the mass content of calcium oxide is 3.22%; the mass content of magnesium oxide The content is 1.07%, and the mass content of phosphorus pentoxide is 0.24%;

[0143] The ratio of the fly ash mass to the volume of the alkaline solution is 1:3.5; the concentration of sodium hydroxide in the alkaline solution is 80g / L (usually 50-230g / L), and the concentration of sodium carbonate is 18g / L (usually 2- 20g / L); the alkali dissolution treatment temperature is 95°C; the alkali dissolution treatment time is 7.0h; the primary alkali dissolution fly ash (88.7g); the primary alkali dissolution solution (282ml); the silicon dioxide concentration in the primary alkali dissolution solution is Except 44.36g / L, all the other are identical wi...

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Abstract

The invention provides a method for preparing aluminum-silicon oxide from fly ash. The method comprises the following steps: sequentially carrying out alkali dissolution treatment, acid leaching treatment and roasting treatment on the fly ash. According to the preparation method for extracting the aluminum-silicon oxide from the coal ash, the coal ash is used as a raw material, and undergoes two-stage atmospheric pressure leaching, so the reaction pressure is reduced, the equipment investment is reduced, the preparation process is simple and easy to operate, and the preparation cost is low.

Description

technical field [0001] The invention relates to a preparation method of high-purity aluminum-silicon oxide, which belongs to the field of resource utilization of fly ash. Background technique [0002] my country's bauxite resources are becoming increasingly depleted, and the dependence on foreign bauxite is increasing year by year, seriously affecting the sustainable development of the aluminum industry. The Ordos Basin in Inner Mongolia is rich in high-alumina coal. After the coal is calcined, the alumina content in the fly ash can reach more than 50%. Making full use of the resources such as aluminum and silicon in it is an effective way to use fly ash with high added value. [0003] In recent years, various universities and scientific research institutes in my country have actively carried out the research and exploration of high-alumina fly ash resource utilization technology, mainly to make use of its high-alumina and high-silicon resource endowment, and the extraction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/06C01F7/08C01F7/22C01F7/24C01F7/26C01B33/12C01B33/24C25C3/36
CPCC01F7/02C01F7/0693C01F7/08C01F7/22C01F7/24C01F7/26C01B33/12C01B33/24C25C3/36Y02P10/20
Inventor 豆卫博高培君范超李海军叶文圣邢亚飞
Owner 内蒙古蒙泰集团有限公司
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