High-purity silicon powder has the characteristics of good insulation, low thermal expansion coefficient, and high chemical stability. It is widely used in semiconductor raw materials, silicone resin raw materials, solar cell substrates, optical glass electronic packaging materials, etc.

The jaw crusher is used to crush and screen to obtain -0.20mm quartz sand. The magnetic minerals and impurities in the quartz sand are initially removed by magnetic separation by a dry strong magnetic separator (1.0T);

After grinding and scrubbing with a planetary ball mill, the quartz sand is ground to the expected particle size, and the iron film and clay minerals on the surface of the quartz are scrubbed. The planetary ball mill has a speed of 600r/min, a slurry mass fraction of 50%, and a ball milling time of 80min. The content of SiO2 in the refined sand obtained by ball rubbing was increased to 99.76%, the whiteness increased from 52.7% of the original ore to 86%, and the content of all impurities was reduced.

Quartz sand is scrubbed by ball milling. Although the content of SiO2 is increased while being finely ground, the residual impurities in the silicon powder need to be acid leached, and the purification effect of mixed acid acid leaching is more obvious. The acid mass fraction is 12%, the mass ratio of oxalic acid, sulfuric acid, and hydrochloric acid is 2.5: 3.75: 3.75, the liquid-to-solid ratio is 3 mL/g, the temperature is 50°C, ultrasonic acid leaching treatment is performed for 2 hours, dried and dispersed to obtain high-purity silicon powder.

The above article is the preparation process of pure silicon powder that the editor tells you. You can simply understand it. Lianyungang Oster Silicon Powder Co., Ltd. has been producing silicon powder for many years. If you need consultation, please contact us.