Method for separating free carbon from ultra-fine silicon carbide powder

A technology of silicon carbide powder and free carbon, applied in the field of separation of free carbon, can solve the problems of difficult recovery of silicon carbide powder, large loss of silicon carbide powder, affecting the physical properties of products, etc., to increase economic and social benefits, reduce The effect of production cost and labor intensity reduction

Active Publication Date: 2013-04-03
PINGDINGSHAN YICHENG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of removing free carbon from ultra-fine silicon carbide powder in China is generally adopted - carbon washing method. A large amount of free carbon exists, resulting in unqualified product quality, which seriously affects the physical properties of the product, and the loss of silicon carbide powder during the car

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1:

[0023] A method for separating free carbon from ultrafine silicon carbide powder includes the following steps:

[0024] Step 1: Put 1t of ultra-fine silicon carbide powder with a mass percentage of 0.8% free carbon in a separation container, and then add purified water with a mass twice the mass of the silicon carbide powder to the separation container. The conductivity is 50μs / cm, and the separating agent polyethylene glycol with a mass of 0.05% times the mass of the silicon carbide powder is added, and then stirred with a stirring device. The speed of the stirrer is 60r / min. After stirring for 3 hours, let it stand. After 2 hours, the mixture is divided into two layers, among which, the upper layer is the clear liquid layer, and the lower layer is the ultrafine silicon carbide powder layer;

[0025] Step 2: Use a pump to pump the clear liquid layer in step 1 into the circulation container, store it, and reserve;

[0026] Step 3: Insert the over-frequency vibrati...

Example Embodiment

[0030] Example 2:

[0031] A method for separating free carbon from ultrafine silicon carbide powder includes the following steps:

[0032] Step 1: Put 1t of ultra-fine silicon carbide powder with a mass percentage of 0.48% free carbon in the separation container, and then add purified water 3.5 times the mass of the silicon carbide powder into the separation container. The conductivity is 35μs / cm, and the separation agent polyethylene glycol with a mass of 0.4% times the mass of silicon carbide powder is added, and then stirred with a stirring device. The speed of the stirrer is 90 r / min. After stirring for 1.75h, let it stand , After standing for 4 hours, the mixture is divided into two layers, in which the upper layer is the clear liquid layer, and the lower layer is the ultrafine silicon carbide powder layer;

[0033] Step 2: Use a pump to pump the clear liquid layer in step 1 into the circulation container, store it, and reserve;

[0034] Step 3: Insert the over-frequency vibrat...

Example Embodiment

[0038] Example 3:

[0039] A method for separating free carbon from ultrafine silicon carbide powder includes the following steps:

[0040] Step 1: Put 1t of ultra-fine silicon carbide powder with a mass percentage of 0.16% of free carbon in the separation container, and then add pure water with a mass of 5 times the mass of the silicon carbide powder to the separation container. The conductivity is 20μs / cm, and the separating agent polyethylene glycol with a mass of 0.9% times the mass of the silicon carbide powder is added, and then stirred with a stirring device. The speed of the stirrer is 120r / min. After stirring for 0.5h, it is static After standing for 6 hours, the mixture is divided into two layers, in which the upper layer is the clear liquid layer, and the lower layer is the ultrafine silicon carbide powder layer;

[0041] Step 2: Use a pump to pump the clear liquid layer in step 1 into the circulation container, store it, and reserve;

[0042] Step 3: Insert the over-frequ...

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Abstract

The invention relates to a method for separating free carbon from ultra-fine silicon carbide powder. The method comprises the steps of: 1, placing the ultra-fine silicon carbide powder containing free carbon into a separating container, adding pure water and a separating agent, mixing, and keeping static for stratification; 2, pumping clear solution in Step 1 with a pump into a circulating container; 3, inserting an over-frequency vibratory rod into the ultra-fine silicon carbide powder layer for vibration; 4, scraping and collecting free carbon on the surface of sediment obtained after vibration in Step 3; and 5, pumping the clear solution which is pumped into the circulating container in Step 2 into the separating container again, repeating mixing and maintenance of the static state in Step 1, repeating Step 2, Step 3 and Step 4 until no obvious black aggregates exist on the surface of the ultra-fine silicon carbide powder, thereby completing separation of the free carbon from the ultra-fine silicon carbide powder. No hidden safety risks or environmental pollution can be caused in recovery of fine silicon carbide powder; and the process is simple and convenient to operate, the labor intensity of workers can be reduced, the working efficiency can be increased, the production cost can be decreased, and economic benefits and social benefits can be improved.

Description

technical field [0001] The invention relates to a purification process of ultrafine silicon carbide powder, in particular to a method for separating free carbon from ultrafine silicon carbide powder. Background technique [0002] Improving the purity of ultra-fine silicon carbide powder mainly involves removing free carbon and ferric oxide in the powder. At present, the method of removing free carbon from ultra-fine silicon carbide powder in China is generally adopted - carbon washing method. A large amount of free carbon exists, resulting in unqualified product quality, which seriously affects the physical properties of the product, and the loss of silicon carbide powder during the carbon washing process is large, and the lost silicon carbide powder is not easy to recycle, resulting in material loss. Waste, based on the above factors, there is a need for a method for purifying and removing carbon from ultrafine silicon carbide micropowder with simple production process...

Claims

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Application Information

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IPC IPC(8): B03B5/36
Inventor 曲丽伟梁贵振杨正宏张强刘创
Owner PINGDINGSHAN YICHENG NEW MATERIAL
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