Production process of silicon carbide

Abstract

The invention relates to a technology for processing silicon carbide crystal through wasted fine silicon carbide powder, which comprises the steps of adding quartz sand and coke into a silicon carbide reaction furnace, and adding silicon carbide particles prepared by wasted fine silicon carbide powder into the silicon carbide reaction furnace before the smelting of silicon carbide. The invention provides a production technology of silicon carbide, which can prevent furnace spraying and furnace blasting, and has the advantages of high utility ratio of fine silicon carbide powder, low energy consumption, low environment pollution level, and simpleness and convenience in operation.

Description

technical field [0001] The invention belongs to the field of material preparation, and relates to a silicon carbide production process, in particular to a silicon carbide crystal processing process using discarded silicon carbide fine powder. Background technique [0002] In the production and application of silicon carbide, there will be great waste in two aspects: First, in the process of processing silicon carbide crystal blocks into abrasives, especially in the processing of solar wafer cutting blades, 40% of the raw materials will be generated Above fine powder; The 2nd, can produce a large amount of used waste green silicon carbide cutting material fine powders in the cutting process of solar wafer. Except for a very small amount of these fine powders that can be used reasonably, most of them are used to be processed into lower-grade refractory materials. During the production process of silicon carbide, its basic reaction is: SiO 2 +3c=Sic+2CO-498kJ, because silicon...

AI Technical Summary

Problems solved by technology

However, if silicon carbide fine powder is directly added during silicon carbide smelting, the carbon monoxide gas generated during silicon carbide smelting will not be able to be discharged smoothly, which will easily cause furnace blasting or explosion.

At present, for the sake of safety, silicon carbide production enterprises can only add a very small amount of silicon carbide fine powder during silicon carbide smelting, resulting in great waste

At the same time, because silicon carbide fine powder is easy to adhere to the weighing hopper and conveyor belt, it will cause batching errors and reduce product quality.