Method for separating silicon carbide from silicon carbide micro-powder graded byproducts

Abstract

The invention discloses a method for separating silicon carbide from silicon carbide micro-powder graded byproducts, which comprises the following steps of: filling a carbon material into a treatment pond I, adding deionized water in an amount which is 2 to 5 times the weight of the carbon material and alkali liquor in an amount which is 0.05 to 0.3 of the weight of the raw carbon material into the treatment pond I, and standing the mixture for 2 to 5 hours; after demixing treatment, collecting slurry of a carbon material layer to a treatment pond II, adding alkali liquor and dispersant in anamount which is 0.05 to 0.3 percent of the weight of the slurry respectively into the treatment pond II, and standing the mixture for 3 to 4 hours; and demixing the mixture again to obtain separated silicon carbide micro-powder on the lower layer. Material addition and demixing treatment are performed twice, wherein the secondary treatment is performed under the condition that most carbon is removed in the first time; the added dispersant is used for separating carbon particles adhered to certain silicon carbide particles and separating the silicon carbide particles adhered to the carbon particles, so the treatment effect is promoted, the separated silicon carbide micro-powder has higher purity, and more values are created for enterprises.

Description

technical field [0001] The invention relates to a method for recovering silicon carbide micropowder, in particular to a method for separating silicon carbide from by-products of silicon carbide micropowder classification. Background technique [0002] At present, in the silicon carbide powder classification process, some by-products will be produced, and one of the by-products is called carbon material (we collectively refer to carbon material with a free carbon content greater than 50%), which is carbonized through a unique foaming carbon washing process The separation of free carbon in silicon fine powder from silicon carbide powder is a current processing method at home and abroad. However, in the process of carbon washing, a small amount of silicon carbide particles will be washed out together with free carbon to form a by-product carbon material. The market price of carbon material is very low, and it contains a large amount of silicon carbide micropowder particles. wo...

AI Technical Summary

Problems solved by technology

However, in the process of carbon washing, a small amount of silicon carbide particles will be washed out together with free carbon to form a by-product carbon material. The market price of carbon material is very low, and it contains a large amount of silicon carbide micropowder particles. would be a huge waste

The traditional method of recovering silicon carbide micropowder contained in carbon materials is still processed by carbon washing process. This method is more suitable for raw materials with low carbon content, and the traditional method has long processing time and requires a large amount of Acidic substances and alkaline substances have a great impact on the environment, and at the same time pose a safety hazard to operators, and waste a lot of manpower, material and financial resources