Ultra-fine metal silicon powder production method

Abstract

The present invention discloses an ultra-fine metal silicon powder production method, which comprises that a raw material metal silicon powder is subjected to acid washing, alkali washing and ingot casting treatment to obtain a semi-finished product with a purity of 99.9-99.999%, coarse crushing is performed, screening is performed through a 100-mesh sieve, washing is repeatedly performed 5-8 times with deionized water to achieve the purity of more than or equal to 99.995%, the material is crushed in a jet mill through the 1-3 time ultra-high-speed airflow of low temperature, high purity and high pressure gas, and the crushed particles enter a grading chamber, wherein the large particles are continuously crushed, the small particles enter a cyclone separator to carry out separation grading package with different finenesses, the final product purity is 99.99-99.999%, the product particle size is 1000-12500 mesh, and the yield is more than or equal to 99%. According to the present invention, the process is simple, no dust is discharged and no impurity enters during the crushing process so as not to cause secondary pollution, and the product has characteristics of high yield, fine particle size, uniform distribution, and regular morphology.

Description

technical field [0001] The invention belongs to the field of silicon material processing, and in particular relates to a production method of ultrafine metal silicon powder. Background technique [0002] Ultrafine metal silicon powder is the most important semiconductor material, widely used in computer, microwave communication, optical fiber communication, solar power generation and so on. Scientists refer to the present era as the silicon era. Metal silicon has excellent physical, chemical and semiconducting properties, so it is quickly applied in semiconductor devices and has developed rapidly. The traditional preparation of ultra-fine metal silicon powder is prone to impurities in the production process, which is not conducive to large-scale industrial production. There are often problems of fine and impure, pure but not fine, and some processes are too complicated and the production cost is high. At present, the source of my country's ultra-fine metal silicon p...

AI Technical Summary

Problems solved by technology

The traditional preparation of ultra-fine metal silicon powder is prone to impurities in the production process, which is not conducive to large-scale industrial production. There are often problems of fine and impure, pure but not fine, and some processes are too complicated and the production cost is high.