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Method for recovering silicon and method for producing silicon

A recycling method and a manufacturing method technology, applied in the field of silicon manufacturing, can solve the problems of difficult separation, difficult filtration and separation, and adverse effects on the performance of silicon wafers, and achieve the effect of effectively manufacturing silicon and reducing power consumption.

Inactive Publication Date: 2013-02-06
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the silicon and silicon carbide generated during cutting are both particles of 10 μm or less, it is difficult to separate them by filtration, and since the densities are close, it is also difficult to separate them by using density differences
[0005] On the other hand, if silicon carbide remains in the silicon ingot, the wire saw will be cut when the silicon ingot is sliced, or the performance of the silicon wafer will be adversely affected, so it is required to strictly separate the silicon carbide.

Method used

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  • Method for recovering silicon and method for producing silicon
  • Method for recovering silicon and method for producing silicon
  • Method for recovering silicon and method for producing silicon

Examples

Experimental program
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Effect test

reference example 1

[0144] The mixed powder of silica powder and silicon carbide abrasive grains was heated at 2,000° C. for 2 hours in an argon atmosphere using an induction heating furnace. Feed compositions and compositions after heating are shown in Tables 1 and 2. As shown in Tables 1 and 2, the weight of silica powder and silicon carbide powder decreased, and silicon was generated.

reference example 2

[0146] The mixed powder of silica powder and silicon carbide powder was heated in the same manner as in Example 1. Feed compositions and compositions after heating are shown in Tables 1 and 2. As shown in Tables 1 and 2, the weight of silica powder and silicon carbide powder decreased, and silicon was generated.

reference example 3

[0148] Silica powder is mixed with silicon cutting powder containing silicon carbide abrasive grains to form a mixed powder, and the mixed powder is heated. Heating was performed in the same manner as in Example 1. Tables 1 and 2 show the composition of the mixed powder and the composition of the product after heating.

[0149] As shown in Tables 1 and 2, the weight of silica powder and silicon carbide powder decreased, and the weight of silicon also decreased. The reduction in the weight of silicon is due to volatilization of SiO produced by the reaction of silicon dioxide and silicon.

[0150] It should be noted that, from the weight reduction of silicon carbide, it can be seen that SiC+SiO 2 → 2SiO+CO, SiO, which is important for silicon formation, occurs as shown in the above formula (5).

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Abstract

A method for recovering or producing silicon, that can recover or produce silicon using cutting scraps containing silicon carbide abrasive grains and silicon as raw materials without separating those is provided. The present invention is a method for recovering or producing silicon from cutting scraps containing silicon carbide, which are produced during a cutting or grinding of silicon ingots or silicon wafers, wherein the method comprises producing silicon by heating the cutting scraps containing silicon carbide, and a silica raw material.

Description

technical field [0001] The present invention relates to a silicon recovery method and a silicon production method. Specifically, it relates to a method of recovering silicon from cutting chips generated during cutting or grinding of a silicon ingot or a silicon wafer, and a method of producing silicon from the cutting chips and a silicon dioxide raw material. Background technique [0002] Solar cells have the advantages of reducing carbon dioxide emissions per unit of power generation and requiring no fuel for power generation, and their demand has been increasing in recent years. Currently, among practical solar cells, single-junction solar cells using single crystal silicon or polycrystalline silicon and having a set of pn junctions are becoming the mainstream, and the demand for silicon is increasing as demand for solar cells increases. Silicon used for solar cells is required to have high purity for improving cell efficiency. [0003] Most silicon wafers for solar cell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/023C01B33/025
CPCC01B33/023C01B33/025
Inventor 山原圭二片山利昭桥口正白滨利基泽井毅
Owner MITSUBISHI CHEM CORP