Method for pick-up silicon carbide from slag containing silicon carbide

Abstract

A process for extracting SiC from the slags containing SiC includes such steps as removing the impurities (Mg, Ca, Fe, Si, etc) from the slags by dissolving them in the diluted solution of acid and the diluted solution of alkali, washing with clean water, dewatering and drying.

Description

technical field [0001] The invention belongs to a chemical extraction method, more specifically, a method for extracting industrial silicon carbide from Sic-containing slag. Background technique [0002] The known production method of silicon carbide, such as "Refractory Materials" magazine, No. 3, 1988, 58, entitled "Production Method of Industrial Silicon Carbide", is made by smelting silicon oxide and coke in a resistance furnace. The reaction of the produced silicon carbide is not uniform, and the silicon carbide products must be sorted out from the unreacted materials when they are released from the furnace, which is labor-intensive and time-consuming. The unreacted materials and silicon oxide after sorting need to be returned to the furnace for repeated smelting, which consumes a lot of energy and the product yield is also low. It is known that calcium carbide, graphite, industrial silicon and other industrial slags all contain silicon carb...

AI Technical Summary

Problems solved by technology

[0002] The known production method of silicon carbide, such as "Refractory Materials" magazine, No. 3, 1988, 58, entitled "Production Method of Industrial Silicon Carbide", is made by smelting silicon oxide and coke in a resistance furnace. The produced silicon carbide has an uneven reaction, and it is labor-intensive and time-consuming to sort out the silicon carbide products from the unreacted materials when they are released from the furnace.

The unreacted materials and silicon oxide after selection need to be returned to the furnace for repeated smelting, which consumes a lot of energy and the product yield is low

It is known that calcium carbide, graphite, industrial silicon and other industrial slags all contain silicon carbide (about 20-60% of SiC content) in varying degrees. These slags are all abandoned in the wilderness when mixing furnaces, which not only pollutes the environment, but also is a kind of waste