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Preparation method of cryolite

A cryolite and polysilicon technology, applied in the field of cryolite preparation, can solve the problems of strong corrosion and toxicity

Inactive Publication Date: 2012-10-10
YINGLI ENERGY CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, both wet and dry synthetic cryolites have major defects. The intermediate material hydrogen fluoride gas is highly corrosive and toxic, which puts forward high requirements for the selection of production equipment and environmental protection.

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  • Preparation method of cryolite

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Embodiment Construction

[0031] The core of the present invention is to provide a preparation method of cryolite. On the one hand, this preparation method can make full use of the by-products fluosilicic acid and sodium aluminum tetrafluoride produced in the process of preparing polysilicon by the silane method, and the cost of raw materials is low; on the other hand, it can avoid The corrosive and toxic hydrogen fluoride gas produced by dry and wet preparation of cryolite in the prior art has good safety and environmental protection.

[0032] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] Please refer to figure 1 , figure 1 It is a flow chart of the preparation method of cryolite in an embodiment of the present invention.

[0034] In one embodiment, the preparation method of cryolite provi...

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Abstract

The invention discloses a preparation method of cryolite. The preparation method is characterized by comprising the following steps: S11, using sodium carbonate to react with the byproduct, i.e. fluosilicic acid which is generated in a polycrystalline silicon preparation process by using a silane method so as to prepare sodium fluoride; S12, using the sodium fluoride to react with the byproduct, i.e. four aluminum fluoride sodium which is generated in the polycrystalline silicon preparation process by using the silane method so as to prepare six aluminum sodium fluoride; and S13, drying and calcining the six aluminum sodium fluoride so as to prepare the cryolite. On one hand, with the adoption of the preparation method, the byproducts, i.e. the fluosilicic acid and the four aluminum fluoride sodium which are generated in the polycrystalline silicon preparation process by using the silane method can be utilized sufficiently, so that the cost in raw material is low; and on the other hand, the corrosive and toxic hydrogen fluoride gas generated while preparing the cryolite by using a drying and wet method in prior art is avoided, so that the preparation method is good in security and environment-friendliness.

Description

technical field [0001] The invention relates to the technical field of cryolite preparation methods, in particular to a method for preparing cryolite by utilizing fluosilicic acid and sodium aluminum tetrafluoride as by-products produced in the process of preparing polysilicon by a silane method. Background technique [0002] With the development of my country's aluminum industry, the demand for cryolite will continue to increase. At present, the method of domestic production of cryolite mainly follows the traditional wet production process of the Soviet Union in the 1950s. Its disadvantages are serious environmental pollution, expensive raw materials and high cost. my country has also introduced the production method of fluosilicic acid or the compound acid of hydrofluoric acid and fluosilicic acid plus aluminum hydroxide and salt used in Switzerland and France, and conducted production tests, but it has not been promoted due to the difficulty in handling the mother liquor....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54
Inventor 李青娟张月和
Owner YINGLI ENERGY CHINA
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