Production process of silicon carbide fine powder (70F)

Abstract

The invention provides a production process of silicon carbide fine powder (70F), and the method comprises the following steps: selecting silicon carbide, and adding the raw material into a crusher; adding the crushed silicon carbide particles into a screening machine; adding the qualified silicon carbide particles screened out in the second step into a ball mill to be milled into fine powder of 50-200 microns, recycling the fine powder of less than 50 microns, and adding the fine powder of more than 200 microns into the ball mill again; performing multistage airflow grading on the 50-200 [mu]m fine powder through a multistage airflow grading machine to divide the fine powder into three types, namely, the type A 50-100 [mu] m fine powder, the type B 100-150 [mu] m fine powder and the typeC 150-200 [mu] m fine powder; adding the fine powder A, the fine powder B and the fine powder C into a mixing machine according to a certain proportion, and discharging and packaging after the fine powder is uniformly mixed; mixing the fine powder smaller than 50 microns in the step 3 with quartz sand and coke to be added into a silicon carbide reaction furnace again; and repeating the steps 1-6on the silicon carbide obtained in the step 6. According to the invention, the production quality of the silicon carbide fine powder (70F) is effectively improved, and the production cost is saved.

Description

technical field [0001] The application relates to the production of silicon carbide fine powder, in particular to a production process of silicon carbide fine powder (70F). Background technique [0002] Emery, also known as silicon carbide (SiC), is made of quartz sand, petroleum coke (or coal coke), wood chips (salt needs to be added when producing green silicon carbide) and other raw materials through resistance furnace high temperature smelting. Silicon carbide also exists in nature as a rare mineral, moissanite. Silicon carbide is also called moissanite. Among the non-oxide high-tech refractory materials such as C, N, B, etc., silicon carbide is the most widely used and economical one, which can be called corundum or refractory sand. At present, the silicon carbide produced by China's industry is divided into different types due to different industries, such as P sand and F sand. In the production of silicon carbide fine powder (70F), it is often impossible to obtain ...

AI Technical Summary

Problems solved by technology

[0003] This application provides a production process of silicon carbide fine powder (70F), which solves the problem that in the prior art, in the process of fine powder production, it is easy to cause waste of unrecyclable waste ultrafine powder