Method for comprehensively utilizing chemical byproduct single cryolite

A single cryolite and by-product technology is applied in the field of comprehensive utilization of chemical by-product single cryolite, can solve the problems of no treatment method, environmental pollution, waste of resources, etc., achieves huge environmental protection and social benefits, low price, The effect of high utilization of raw materials
CN102107900AActive Publication Date: 2011-06-29BAIYIN ZHONGTIAN CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BAIYIN ZHONGTIAN CHEM
Publication Date
2011-06-29

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Abstract

The invention belongs to the technical field of polysilicon production, in particular to a method for comprehensively utilizing a chemical byproduct single cryolite during production of polysilicon. The method comprises the following steps of: reacting the single cryolite with sodium hydroxide solution to generate hydrogen and sodium aluminate slurry; and reacting the sodium aluminate slurry withhydrofluoric acid to prepare cryolite for aluminum, wherein the byproduct, namely hydrogen in the reaction process is purified and recovered to serve as a byproduct; and mother liquid is used for producing other fluoride products, or being neutralized by adding lime and then being discharged. The byproduct, namely single cryolite, of polysilicon is used for producing cryolite for aluminum, so rawmaterials are readily available, cost is low and the utilization ratio of the raw materials is high; the produced cryolite for aluminum has low impurity content and meets national standard; and wasteis changed into treasure, which accords with production ideas of comprehensive utilization of resources, energy conservation and environmental protection.
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Description

technical field

[0001] The invention belongs to the technical field of polysilicon production, and in particular relates to a comprehensive utilization method of monocryolite, a chemical by-product in polysilicon production. Background technique

[0002] At present, crystalline silicon materials (including polycrystalline silicon and monocrystalline silicon) are the most important photovoltaic materials, with a market share of more than 90%, and will still be the mainstream material of solar cells for a long period of time in the future.

[0003] Polysilicon production processes include improved Siemens method, magnesium silicide method, REC method, silane method and other synthesis processes. Compared with various processes, inorganic production processes such as the silane method have the characteristics of easy availability of raw materials, low energy consumption, low cost, and low environmental protection pressure, and are the future development direction of polysilicon...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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