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Method for purifying polysilicon through enhanced alloying segregation

A polysilicon and alloying technology, applied in chemical instruments and methods, inorganic chemistry, chemical industry, etc., can solve the problems of environmental pollution, large slag consumption, high energy consumption in plasma refining, and achieve high production efficiency, strong practicability, The effect of short industrial production cycle

Inactive Publication Date: 2012-11-21
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the methods of plasma refining and slagging refining can achieve the effect of removing B impurities, they both have disadvantages
Plasma refining energy consumption is relatively high; slag refining has disadvantages such as large amount of slag consumption and environmental pollution

Method used

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  • Method for purifying polysilicon through enhanced alloying segregation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] like figure 1 As shown, a brief process of a method for enhancing alloying segregation to purify polysilicon is as follows: first, pre-treat industrial silicon and primary aluminum, then carry out alloy melting, solidify and purify to obtain primary silicon, and then post-treat the primary silicon , finally get polysilicon with boron content less than 0.2ppmw, the specific operation process is as follows:

[0027] The first step of pretreatment: first take industrial silicon with a purity of 99.0% and a boron content of 25ppmw and primary aluminum with a purity of 99.8%, and perform ultrasonic cleaning with deionized water for 2 hours to remove impurities attached to the surface. The first purpose is to reduce industrial silicon and The content of the original impurities in the original aluminum, the second is to avoid the reaction of some impurities with silicon, which will affect the purification effect;

[0028] The second step of alloying and smelting: Weigh the ra...

Embodiment 2

[0032] like figure 1 As shown, a brief process of a method for enhancing alloying segregation to purify polysilicon is as follows: first, pre-treat industrial silicon and primary aluminum, then carry out alloy melting, solidify and purify to obtain primary silicon, and then post-treat the primary silicon , finally get polysilicon with boron content less than 0.2ppmw, the specific operation process is as follows:

[0033] The first step of pretreatment: first take industrial silicon with a purity of 99.4% and a boron content of 22ppmw and primary aluminum with a purity of 99.7%, and perform ultrasonic cleaning with deionized water for 3 hours to remove impurities attached to the surface. The first purpose is to reduce industrial silicon and The content of the original impurities in the original aluminum, the second is to avoid the reaction of some impurities with silicon, which will affect the purification effect;

[0034] The second step of alloying and smelting: Weigh the ra...

Embodiment 3

[0038] like figure 1 As shown, a brief process of a method for enhancing alloying segregation to purify polysilicon is as follows: first, pre-treat industrial silicon and primary aluminum, then carry out alloy melting, solidify and purify to obtain primary silicon, and then post-treat the primary silicon , finally get polysilicon with boron content less than 0.2ppmw, the specific operation process is as follows:

[0039] The first step of pretreatment: first take industrial silicon with a purity of 99.8% and a boron content of 20ppmw and primary aluminum with a purity of 99.5%, and perform ultrasonic cleaning with deionized water for 4 hours to remove impurities attached to the surface. The purpose is to reduce industrial silicon and The content of the original impurities in the original aluminum, the second is to avoid the reaction of some impurities with silicon, which will affect the purification effect;

[0040] The second step of alloying and smelting: Weigh the raw alum...

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Abstract

The invention belongs to the technical field of metallurgical purification, in particular to a method for enhancing purifying polysilicon through enhanced alloying segregation. The method comprises the following steps of firstly pre-washing industrial silicon and primary aluminum, and fully melting the primary aluminum under the protection of argon, and then adding the industrial silicon to the molten aluminum liquid, heating the mixture to 1100-1200 DEG C, and performing alloying melting; after the mixture is fully molten, adding metal or metal oxide, preserving the temperature and then slowly cooling the mixture, separating boride and primary silicon in sequence, and depositing the boride and primary silicon at the bottom of a crucible; dumping and storing the aluminum-silicon melt at the upper part of the crucible, and finally performing inorganic acid treatment on the primary silicon, removing residual metal and boride, and performing drying treatment on the treated primary silicon to obtain the polysilicon with low boron content. According to the method provided by the invention, on the basis of purification of Si-Al alloy, trace metals such as Fe, Ti, TiO2 or metal oxides are added, the purpose of removing boron impurities in the silicon can be realized, so that the boron content can meet the requirement of the solar grade silicon; the practicability is strong, the industrial production period is short, the energy is saved, the consumption is reduced, the environment is protected, the technology is stable and the production efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of metallurgical purification, in particular to a method for enhancing alloying segregation and purifying polysilicon. Background technique [0002] With the depletion of traditional energy sources such as coal, oil, and natural gas, and the increasingly prominent environmental problems such as global warming, it is imperative to find new clean and renewable energy sources. Among the renewable energy sources, solar energy has become an ideal energy source due to its wide distribution, cleanness and pollution-free characteristics. The technology that converts solar energy into electrical energy is the photovoltaic effect, and the key component of this technology is a solar cell. Polysilicon is the main raw material for the production of solar cells, and the purification cost of polysilicon remains high. It is very important to find low-cost solar-grade silicon purification technology. [0003] At present, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/037
CPCY02P20/10
Inventor 谭毅李佳艳李亚琼贾鹏军
Owner DALIAN UNIV OF TECH
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