Recycle and reuse method of by-product from production of silicon carbide

A technology of silicon carbide and by-products, which is applied in the field of recycling of by-products in silicon carbide production, can solve problems such as environmental pollution and waste of resources, achieve environmental benefits, realize reuse, and improve utilization rates

Inactive Publication Date: 2015-12-09
HENAN XINDAXIN SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the technical problems that the accumulation of by-products in the current production of silicon carbide easily causes environmental pollution and waste of resources, and provides an efficient, fast and practical method for processing by-products in the production of silicon carbide, so as to improve resource utilization and reduce The purpose of environmental pollution

Method used

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  • Recycle and reuse method of by-product from production of silicon carbide

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Experimental program
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Embodiment 1

[0018] Embodiment 1: a method for recycling by-products in silicon carbide production, comprising the following steps:

[0019] (1) Slurry making: Put silicon carbide products with a particle size greater than 1000# in the slurry making tank, add water and stir evenly to obtain a slurry with a mass percentage of silicon carbide micropowder of 30%;

[0020] (2) Impurity removal: the uniformly mixed slurry is firstly deironed by a magnetic separator, and then carbon is removed to remove iron impurities and carbon impurities in the slurry; then the pH value of the slurry is adjusted to 7-8;

[0021] (3) Primary classification: Put the slurry obtained in step (2) into the classification tank, add polyethyleneimine accounting for 0.5‰ of the slurry mass, settle naturally for 30 minutes, and classify to obtain 800# silicon carbide products;

[0022] (4) Secondary classification: add polyethyleneimine accounting for 0.9‰ of its mass to the slurry obtained in step (3), settle naturall...

Embodiment 2

[0025] Embodiment 2: a method for recycling by-products in silicon carbide production, the difference from embodiment 1 is that

[0026] Step (3), add polyethyleneimine and marine polysaccharide mixture accounting for 0.6‰ of slurry mass, settle naturally for 25 minutes, and grade to obtain 800# silicon carbide products;

[0027] Step (4), add a mixture of polyethyleneimine and marine polysaccharides accounting for 0.8‰ of the slurry mass, settle naturally for 25 minutes, and grade to obtain 360# silicon carbide products;

[0028] Step (5), add polyethyleneimine and marine polysaccharide mixture accounting for 1.0‰ of the slurry mass, settle naturally for 25 minutes, and classify to obtain 240# silicon carbide products.

Embodiment 3

[0029] Example 3: A method for recycling by-products in silicon carbide production, the difference from Example 1 is that in step (1), the mass percentage of silicon carbide micropowder in the slurry is 20%;

[0030] Step (3), add polyethylene glycol accounting for 0.7‰ of the mass of the slurry, settle naturally for 30 minutes, and grade to obtain 800# silicon carbide products;

[0031] Step (4), add polyethylene glycol accounting for 0.8‰ of the slurry mass, settle naturally for 25 minutes, and obtain 360# silicon carbide products by classification;

[0032] Step (5), add polyethylene glycol accounting for 1.1‰ of the mass of the slurry, settle naturally for 20 minutes, and grade to obtain 240# silicon carbide products;

[0033] The molecular weight of polyethylene glycol used is 600~1000.

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Abstract

The invention discloses a recycle and reuse method of a by-product from production of silicon carbide and aims to solve the technical problem that by-products in production of silicon carbide in the prior art are aggregated, which causes environment pollution and resource waste. The method includes following steps: 1) preparation of slurry; (2) impurity removal; (3) primary classification; (4) secondary classification; and (5) third classification. The recycle and reuse method can effectively classify by-products during a production process of silicon carbide micro powder, can avoid the problems that aggregated by-product cannot be treated well, which causes environment pollution and resource waste. The method achieves recycle of resources, increases utilization rate of resources and improves workshop environment, and achieves great environmental benefit.

Description

technical field [0001] The invention relates to the technical field of silicon carbide micropowder production, in particular to a method for recycling by-products in silicon carbide production. Background technique [0002] Silicon carbide micropowder, as a cutting edge material for solar crystal silicon wafers, is widely used in the silicon wafer cutting industry. After grading 1000# fine products in silicon carbide micropowder, the coarse material in the lower layer will accumulate in the form of by-products. The accumulation of these coarse materials will not only affect the environment of the production workshop, but also cause a waste of resources. However, there are many problems in the further classification of these coarse materials, which are difficult to implement in actual production. In the silicon carbide production process, the classification method of the product can be divided into moisture and dry content. Due to the large particle size of 800#, 360#, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36
Inventor 孙毅陈亚丽申君来杨正宏辛玲高敏杰
Owner HENAN XINDAXIN SCI & TECH
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