Comprehensive utilization process for production waste material of polysilicon

A technology of polysilicon and waste, applied in the direction of silicon compounds, chemical instruments and methods, inorganic chemistry, etc., to achieve the effect of easy realization of technology, high technical content, safe and reliable process

Inactive Publication Date: 2009-01-07
魏昭荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of recycling the waste produced in the process of improving the Siemens method to produce polysilicon, and to provide a method for the comprehensive utilization of polysilicon production waste

Method used

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  • Comprehensive utilization process for production waste material of polysilicon

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] See accompanying drawing 1 of the description. Get 700 grams of polysilicon production waste and 370 sodium and place it in a sealed container, vacuumize to 10 -2 Pa, heat to about 50°C, keep warm for about 2 hours, the remaining solid in the container is polysilicon and chloride, dissolve the solid with pure water, filter, wash and dry the filter residue, and the solid substance obtained is polysilicon, which weighs 100.3 grams ; After the filtrate is purified, the solid obtained by distillation is sodium chloride, and the obtained sodium chloride is mixed with anhydrous barium chloride and anhydrous calcium chloride, put into an electrolytic cell, heated to about 700 ° C, and the solid is in a molten state. Through low-voltage, high-current direct current, the floating matter on the upper part of the cathode is metal sodium, which can be exported and cooled to obtain solid metal sodium, which can be returned to the first step of the present invention for use; the anod...

Embodiment 2

[0033] See accompanying drawing 1 of the description. Get 700 grams of polysilicon production waste and 350 calcium and place it in a sealed container, vacuumize to 10 -2 Pa, heat to about 150°C, keep warm for about 2 hours, the remaining solid in the container is polysilicon and chloride, dissolve the solid with pure water, filter, wash and dry the filter residue, and the solid substance obtained is polysilicon, which weighs 101.0 grams ; After the filtrate is purified, the solid obtained by distillation is calcium chloride, and the obtained calcium chloride is mixed with 5% cryolite, put into the electrolytic cell, heated to a molten state, and passed through low-voltage, high-current direct current, and the upper melt of the cathode floats The substance is calcium metal, which can be exported and cooled to obtain solid calcium metal, which can be used in the first step of the present invention; the anode produces chlorine gas, which can be collected and used as a raw materi...

Embodiment 3

[0035] See accompanying drawing 1 of the description. Take 700 grams of polysilicon production waste and 560 grams of zinc and place it in a sealed container, vacuumize to 10 -3Pa, heated to about 1000°C, heat-retained for about 2.5 hours, and exported the remaining gas in the container with heat preservation. The remaining solid in the container was polysilicon, which was measured as 102.9 grams; the temperature of the exported product was controlled at about 810°C, and the unreacted gas was separated. Zinc; then export the residue and control the temperature at about 350°C to realize the separation of zinc chloride. Lead the separated zinc chloride liquid into the electrolytic cell, add 5% sodium chloride and calcium chloride as flux, heat to melt, and pass low-voltage, high-current direct current, and the cathode produces zinc, which can be returned to The first step of the present invention is to utilize it; the anode generates chlorine gas, which can be collected and use...

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Abstract

The invention relates to a comprehensive utilization method of polysilicon production waste, and improves the Siemens method polysilicon production process which produces waste, such as silicon tetrachloride, trichlorosilane, dichlorosilane, etc. The comprehensive utilization method comprises the following three steps: the first step: conversion of the polysilicon production waste. The temperature is controlled between 20 DEG C and 1400 DEG C, the waste is converted into silicon and chloride by using the reaction between active metal and polysilicon production waste. The second step: the utilization of silicon. The produced silicon can be used as commercial polisilicon after collection, impurity separation and treatment. The third step: the utilization of chloride. The utilization of chloride can be realized in two ways: direct utilization, and the electrolysis and fusion of chloride, so as to reutilize obtained metal and chlorine. The comprehensive utilization method has the advantages that all products can be recycled and utilized without the discharge of three wastes; the reaction is easy to realize and automation can be realized in the reaction process; the quality of products is stable, and the purity thereof is high; and the method has great economic and social benefits.

Description

1. Technical field [0001] The invention relates to a method for comprehensive utilization of waste generated in the polysilicon production process. 2. Background technology [0002] With the continuous development of the global economy, the demand for energy in countries around the world is increasing day by day. The extensive use of fossil energy has led to two major world problems: energy depletion and environmental pollution. In order to achieve sustainable development of the global economy, the development of the solar energy industry has become an irresistible trend. At present, the practical application of solar cells is mainly crystalline silicon solar cells. Due to the high photoelectric conversion efficiency and relatively low manufacturing threshold, crystalline silicon cells have accounted for 95% of the global solar cell market share, so the production and supply of high-purity polysilicon directly affect Downstream solar cell development. In recent years, the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/033
Inventor 魏昭荣
Owner 魏昭荣
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