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

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...

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 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, less manpower input, and production time saving