Method for extraction of high-purity silicon from crystal silicon cutting waste liquid

A technology for cutting and extracting crystal silicon, which is applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of cutting efficiency reduction and achieve the effects of improving efficiency, no environmental pollution, and continuous process

Inactive Publication Date: 2015-01-14
HENAN CHAOBEI ENG EQUIP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The working principle of multi-wire cutting is: in the water-based cutting fluid composed of SiC as the abrasive, polyethylene glycol as the dispersant, and water as the solvent, the metal wire drives the silicon carbide abrasive for grinding to cut silicon wafers. In the process of crystalline silicon, as a large a

Method used

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  • Method for extraction of high-purity silicon from crystal silicon cutting waste liquid
  • Method for extraction of high-purity silicon from crystal silicon cutting waste liquid
  • Method for extraction of high-purity silicon from crystal silicon cutting waste liquid

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Embodiment 1

[0035] Such as figure 1 As shown in the process flow chart, including the powder classification device (attached figure 2 ), flotation device, washing, filtering, drying device, vacuum induction cold crucible device (attached image 3 ) to extract the high-purity silicon of the present invention. Among them, the classification system is mainly composed of classifier I, classifier II, cyclone dust collector, bag dust collector and induced draft fan; the vacuum induction cold crucible device is composed of power supply, control system, vacuum system and cold crucible system. The power supply of the vacuum induction device is 100Kw. This implementation proceeds as follows:

[0036] 1) After the precursor material is obtained, the highly dispersed mixed powder of the precursor material is quantitatively added to the closed air classifier through the feeder. The whole classification system is carried out under a slight negative pressure, and the powder enters the classificati...

Embodiment 2

[0043] Such as figure 1 As shown in the process flow chart, including the powder classification device (attached figure 2 ), flotation device, washing, filtering, drying device, vacuum induction cold crucible device (attached image 3 ) to extract the high-purity silicon of the present invention. Among them, the classification system is mainly composed of classifier I, classifier II, cyclone dust collector, bag dust collector and induced draft fan; the vacuum induction cold crucible device is composed of power supply, control system, vacuum system and cold crucible system. The power supply of the vacuum induction device is 100Kw. This implementation proceeds as follows:

[0044] 1) After the precursor material is obtained, the highly dispersed mixed powder of the precursor material is quantitatively added to the closed air classifier through the feeder. The whole classification system is carried out under a slight negative pressure, and the powder enters the classification...

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Abstract

Belonging to the technical field of silicon recycle and purification, the invention discloses a method for extraction of high-purity silicon from waste liquid. The method comprises the steps of: precursor material preparation; material classification and flotation; high temperature smelting and separation of an ingot. According to the preparation method for recycled silicon, a high-purity silicon ingot can be acquired by few processing steps. The preparation process does not involve toxic and harmful substances, and acid-base, so that treatment of the ''three wastes'' can be simple. The whole process is continuous, easy to control, and is easy to realize large scale and automation.

Description

technical field [0001] The invention relates to a method for extracting silicon, in particular to a method for extracting high-purity silicon from waste liquid, and belongs to the technical field of silicon recovery and purification. Background technique [0002] Whether it is monocrystalline silicon used in the semiconductor industry or polycrystalline silicon used in solar cells, it is necessary to cut high-purity crystalline silicon into silicon wafers. At present, countries in the world mainly adopt multi-wire wire cutting technology, which has the advantages of high precision, high yield and high efficiency. The working principle of multi-wire cutting is: in the water-based cutting fluid composed of SiC as abrasive, polyethylene glycol as dispersant, and water as solvent, the metal wire drives silicon carbide abrasives for grinding to cut silicon wafers. In the process of crystalline silicon, as a large amount of silicon powder and a small amount of metal chips enter t...

Claims

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Application Information

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IPC IPC(8): C01B33/037
Inventor 马兵胡万明胡鹏飞
Owner HENAN CHAOBEI ENG EQUIP
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