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Method and system for preparing silica aerogel

A silica and aerogel technology, applied in silica, silica and other directions, can solve the problems affecting the mass transfer, heat transfer and separation efficiency of rectification towers, equipment blockage, production uncertainty, etc., and reduce construction costs. cost, reduce the cost of raw materials, and achieve the effect of comprehensive utilization

Active Publication Date: 2019-12-06
新疆硅基新材料创新中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, when the chlorosilane is vaporized, the aluminum trichloride will enter the rectification system together with the chlorosilane. At this time, the aluminum trichloride will be deposited on the inner wall of the rectification tower in the rectification system, affecting the rectification tower. Mass transfer, heat transfer and separation efficiency, causing equipment blockage, etc., bring great uncertainty to production

Method used

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  • Method and system for preparing silica aerogel

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Embodiment 1

[0046] This embodiment provides a system for preparing silica airgel, including:

[0047]The slurry hydrolysis tank is used to mix the slurry in polysilicon production with water, and the silicon-containing substance in the slurry undergoes a hydrolysis reaction to form silica sol to obtain a solid-liquid mixture;

[0048] The suction filtration device is connected with the slurry hydrolysis tank, and the suction filtration device is used to separate the solid-liquid mixture from the solid-liquid mixture to obtain a solid mixture and a liquid mixture, wherein the liquid mixture includes silica sol;

[0049] The neutralization tank is connected with the suction filtration device, and the neutralization tank is used to adjust the pH value of the liquid mixture to be alkaline with an alkaline solution for gelation treatment, and the silica sol in the liquid mixture generates silica gel; the neutralization tank also It is used to replace the silicone gel with solvent to replace th...

Embodiment 2

[0055] Such as figure 1 As shown, the present embodiment provides a system for preparing silica airgel, comprising:

[0056] The slurry hydrolysis tank 1 is used to mix the slurry in polysilicon production with water, and the silicon-containing substances in the slurry undergo hydrolysis reaction to form silica sol to obtain a solid-liquid mixture. Specifically, the first agitator 2 is installed in the slurry hydrolysis tank 1 in this embodiment, and the motor power of the first agitator 2 is adjusted according to the processing capacity of the slurry to ensure that the hydrolysis reaction is complete. The top of the slurry hydrolysis tank 1 is provided with a safety valve, which is connected to the leaching tower. The safety valve is used to prevent the rapid rise of the pressure in the slurry hydrolysis tank 1 and cause a safety accident.

[0057] The slurry waste liquid discharged from the polycrystalline silicon cold hydrogenation process containing silicon powder, cataly...

Embodiment 3

[0082] This embodiment provides a method for preparing silica airgel using the system in Embodiment 2, comprising the following steps:

[0083] 1) Mix the slurry in polysilicon production with water, and the silicon-containing substance in the slurry undergoes a hydrolysis reaction to form silica sol to obtain a solid-liquid mixture.

[0084] 2) Separating the solid-liquid mixture into a solid-liquid mixture to obtain a solid mixture and a liquid mixture respectively, wherein the liquid mixture includes silica sol.

[0085] 3) Take out the solid mixture for nitrogen protection, and carry out cold hydrogenation reaction with hydrogen and silicon tetrachloride.

[0086] 4) mixing the liquid mixture with a complexing agent, and removing the metal ions in the liquid mixture that can undergo complexation reaction to form precipitates through a complexation reaction to obtain a liquid mixture from which metal ions have been removed. Among them, the complexing agent includes F - and ...

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Abstract

The invention discloses a method for preparing an aerosil and a system thereof. The method comprises the following steps: 1) slag slurry in polysilicon production and water are mixed, a hydrolysis reaction is carried out to generate silica sol, and a solid-liquid mixture is obtained; 2) the solid-liquid mixture is subjected to solid-liquid separating, and a solid mixture and a liquid mixture are respectively obtained, wherein the liquid mixture comprises silica sol; 3) an alkaline solution is used for adjusting pH value of the liquid mixture to alkalescence, gelating treatment is carried out,and silica sol in the liquid mixture generates silicon gel; 4) the silicon gel is subjected to solvent replacing, and water in the silicon gel is replaced; and 5) drying is carried out to obtain the aerosil. The method employs the slag slurry in polysilicon production as a silicon source of aerosil, raw material cost for preparation of the aerosil is reduced, environment pollution, solid waste processing cost and material waste are reduced, and enterprise economic benefit can be increased.

Description

technical field [0001] The invention belongs to the technical field of polysilicon production, and in particular relates to a method and system for preparing silica airgel. Background technique [0002] The trichlorosilane production process involved in the polysilicon production system includes two processes: direct chlorination (prepared by the reaction of silicon powder and hydrogen chloride) and hydrochlorination (silicon tetrachloride, hydrogen, silicon powder and catalyst), no matter which process Slurry will be obtained during the production process. With the increasing scale of polysilicon factories, more and more raffinate and slurry are discharged. The slurry is rich in a large amount of chlorosilanes, metal chlorides and solid substances. Generally, high-temperature steam is used in industry to vaporize the chlorosilanes in the slurry, so that the chlorosilanes in the slurry are separated from the solid substances and recovered by condensation One of the chloros...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/16
CPCC01B33/16
Inventor 王瑞聪范协诚银波夏进京罗飞飞武珠峰
Owner 新疆硅基新材料创新中心有限公司
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