Impurity removing process for enhancing quality of silicon carbide fine micro powder

A silicon carbide, fine and micro technology, which is applied in the field of impurity removal process to improve the quality of silicon carbide fine powder, can solve the problem of high content of free carbon and ferric oxide, the content of fine particles and fine powder is easy to exceed the standard, and the quality of silicon carbide fine powder is not good. Stability and other issues, to achieve high quality and cleanliness, improve cleanliness, and improve the effect

Active Publication Date: 2014-12-17
PINGDINGSHAN YICHENG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the content of fine powder in the silicon carbide fine powder processed by the existing silicon carbide fine powder impurity removal process is easy to exceed the standard, and the content of free carbon and ferric oxide is relatively high, and the silicon carbide fine powder unstable quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put the silicon carbide fine powder into the mixing tank, add deionized water to prepare a slurry with a mass concentration of 30%, and after stirring evenly, send the slurry to the turnover cylinder, which is connected to the flotation column through pipelines, and turns to the turnover Add the quaternary ammonium salt blowing agent (such as dodecyl dimethyl benzyl ammonium chloride) and the polyoxyethylene of 0.01% of the total weight of the slurry in the slurry in the cylinder, and then put The slurry is sent to the flotation column for flotation carbon removal, air is introduced from the bottom of the flotation column, and the foam generated on the slurry surface is removed, and the slurry flowing out of the outlet of the flotation column is sent to the wet magnetic separator through the pipeline Carry out magnetic separation to remove iron, and send the slurry treated by the wet magnetic separator to the turnover tank again, add water to adjust its concentration to ...

Embodiment 2

[0029] Put the silicon carbide fine powder into the mixing tank, add deionized water to prepare a slurry with a mass concentration of 50%, and after stirring evenly, send the slurry to the turnover cylinder, which is connected to the flotation column through a pipeline to the turnover Add 0.01% sulfonyl hydrazide foaming agent and 0.01% polyoxyethylene to the slurry in the cylinder, then send the slurry to the flotation column for flotation decarbonization, from the flotation Air is introduced into the bottom of the column to remove the foam generated on the slurry surface. The slurry flowing out of the outlet of the flotation column is sent to the wet magnetic separator through the pipeline for magnetic separation and iron removal. The slurry treated by the wet magnetic separator Send it to the turnover tank again, add water to adjust its concentration to 50%, and add foaming agent of 0.01% of the total weight of the slurry after adjusting the concentration and polyoxyethylene...

Embodiment 3

[0031]Put the silicon carbide fine powder into the mixing tank, add deionized water to prepare a slurry with a mass concentration of 40%, and after stirring evenly, send the slurry to the turnover cylinder, which is connected to the flotation column through pipelines, and turns to the turnover Add the sodium dodecylbenzenesulfonate of 0.01% of the total weight of slurry and the polyoxyethylene of 0.01% of the total weight of slurry in the slurry in the cylinder, then send the slurry to the flotation column for flotation decarbonization, from Air is introduced into the bottom of the flotation column to remove the foam generated on the slurry surface. The slurry flowing out of the outlet of the flotation column is sent to the wet magnetic separator through the pipeline for magnetic separation and iron removal. The material treated by the wet magnetic separator The slurry is sent to the turnover tank again, and the concentration is adjusted to 40% by adding water, and the foaming ...

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PUM

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Abstract

The invention discloses an impurity removing process for enhancing quality of silicon carbide fine micro powder and relates to an impurity removing method of silicon carbide micro powder. The process comprises the following steps: firstly, adding the silicon carbide fine micro powder into deionized water to prepare 30% slurry, and adding a foaming agent and polyoxyethylene which account for 0.01% of the total weight of the slurry; then, feeding the slurry to a flotation column to float and decarbonize; then, feeding the floated slurry to a wet magnetic separator for magnetic separation to remove iron; repeating the above operations till foam in the floatation column changes from being deep to being light and is off-white and stopping flotation and magnetic separation process; then, diluting the concentration of the slurry discharged from the wet magnetic separator, and adding a surfactant; then, feeding to a cyclone grading system to remove particles which are less than 5.5 microns; and then dehydrating and drying to obtain high quality silicon carbide fine micro powder with Fe2O3 less than or equal to 0.4%, free carbon less than or equal to 0.3% and particle content less than or equal to 3.5%. The silicon carbide fine micro powder disclosed by the invention is stable in quality, high in cleanliness and simple in production process, and the treatment time is greatly shortened.

Description

technical field [0001] The invention relates to a process method for removing impurities of silicon carbide fine powder, in particular to a process for removing impurities by pretreating the silicon carbide fine powder and improving physical and chemical indicators before the silicon carbide fine powder is classified. Background technique [0002] As an important auxiliary material for crystalline silicon wire cutting in the photovoltaic industry and semiconductor industry, silicon carbide fine powder products have high requirements for physical and chemical indicators. At present, the improvement of its physical and chemical indicators is mainly to control the free carbon, ferric oxide, and fine powder contained in the raw material of silicon carbide fine powder. Fish out to achieve the purpose of removing free carbon, use magnetic rods to absorb iron, achieve the purpose of removing ferric oxide in raw materials, and use natural precipitation to remove fine particles and f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36
Inventor 孙毅梁贵振梁西正杨正宏吕春长张强刘创
Owner PINGDINGSHAN YICHENG NEW MATERIAL
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