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Pickling impurity removal method and equipment and method and system for purifying polysilicon

A polysilicon, pickling technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of pickling and impurity removal methods without cost, efficiency and impurity removal effect

Inactive Publication Date: 2010-03-17
BAOTOU SHANSHENG NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Considering the above factors, there is no pickling and impurity removal method that takes into account cost, efficiency and impurity removal effect in the prior art

Method used

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Embodiment Construction

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments. It should be pointed out that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0037] In the pickling and impurity removal method of the present invention, the crude silicon that is easy to be removed by acid is obtained by controlling the solidification process of the metallurgical silicon released from the furnace, and then the components in the crude silicon are analyzed to determine the type of acid and the pickling sequence.

[0038] In the pickling and impurity removal method of the present invention, the pickled silicon powder particles are between 60-120 mesh, preferably 100 mesh.

[0039] In the pickling and impurity removal method of the present invent...

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Abstract

The invention discloses a pickling impurity removal method for removing impurities after metallurgical silicon drawacharge and before melting purification. The method comprises the following steps: slowing down the cooling process of the drawacharge of the metallurgical silicon, smashing the cooled metallurgical silicon into silicon powder with certain granularity, and selecting a plurality of acids to carry out pickling operation on the silicon powder according to a certain sequence. The invention also discloses pickling impurity removal equipment, a metallurgical silicon purification methodand a metallurgical silicon purification system. In the invention, optimized cooling process and reasonable pickling sequence are adopted, and proper granularity and suitable temperature are selected,therefore, the pickling process flow is optimized to realize the optimal pickling effect, the content of Fe, Al, Ca, Mn, Ti, Ni and other metal impurities are effectively reduced, and the purification purpose is realized.

Description

technical field [0001] The invention relates to a polysilicon purification process, in particular to a pickling and impurity removal method, pickling and impurity removal equipment for realizing the pickling and impurity removal method, a polysilicon purification method using the pickling and impurity removal method, and a polysilicon purification system. Background technique [0002] In the prior art, the purity of metallurgical silicon produced by the arc-heated quartz sand carbon reduction method is roughly 99%-99.9% (ie 2N-3N), and the impurities with high content mainly include Fe, Al, Ca, Mn, Ti, Ni , B, P, C, O, etc. (concentrations range from thousands to hundreds of ppm). In order to prepare high-purity polysilicon materials and meet the performance requirements of silicon solar cells for polysilicon materials, further purification must be carried out in order to fully reduce the content of impurities, so that the purity of the materials can reach more than 99.9999%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/037
Inventor 董志远赵友文田宝利
Owner BAOTOU SHANSHENG NEW ENERGY
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