Method of preparing high-purity ultra-fine sphere silicon micro-powder

Abstract

This invention discloses a method for preparing purified super-fine spherical Si micro-powder, which first of all selects natural quartz breeze roughly, cleans it and adds an aging agent to be aged in an alkali condition and filtered, then dehydrates and dries the filtered matter and processes it to powder or blocks by adding a binder to be burnt under 1280-1680deg.C in a high temperature furnace for 1-10h to be cooled and dispersed to be grinded to powder spheres and graded by magnetic selection and wind selection to get purified super-fine spherical silicon micro-powder.

Description

technical field [0001] The invention relates to a preparation method of quartz powder, in particular to a preparation method of high-purity ultrafine spherical silicon micropowder. Background technique [0002] With the continuous development of science and technology, silicon micropowder used in high-tech industries such as high-grade coatings, advanced fillers, insulating materials, electronic packaging materials, and aerospace requires not only good fluidity, dispersibility, small thermal conductivity, and electrical conductivity. Low and corrosion resistance, and require high quality standards for its silica powder spheroidization rate, whiteness and purity. At the same time, the demand for spherical silica powder used in the above industries is large, and the global market demand is at least 30 billion yuan. At present, the methods for preparing high-purity ultrafine spherical silica powder at home and abroad include chemical vapor phase method, c...

AI Technical Summary

Problems solved by technology

At present, the methods for preparing high-purity ultrafine spherical silica powder at home and abroad include chemical vapor phase method, chemical precipitation method, high-frequency plasma method, high-temperature melting method, sol-gel method and other chemical preparation methods and mechanical physical preparation methods. The chemical preparation methods all have the problems of large investment, low output, high cost, and low input-output rate. The existing mechanical and physical preparation methods also have problems such as low spheroidization rate and low whiteness.

Therefore, the existing methods for preparing spherical silica powder cannot meet the requirements of high output and high quality of spherical silica powder at the same time.