Silicon powder production technology!

As a modified silicon powder manufacturer, today Xiaobian will talk about the production technology of silicon powder.

According to the particle shape, the main products of silicon powder on the market are angular silicon powder, quasi spherical silicon powder and spherical silicon powder. For the production of angular silicon powder, the shape of angular silicon powder is irregular, mostly angular silicon powder. Its raw materials are vein quartz, quartzite and fused quartz, which can be divided into angular crystalline silicon powder and angular fused silicon powder. The main production equipment of angular silicon micro powder includes ball mill, vibration mill, micro powder classifier and dryer, and the production process includes dry grinding and wet grinding. The grinding medium is mainly alumina ceramic ball or silica, and the mill lining is made of high-strength wear-resistant materials, such as alumina ceramic, silica or polyurethane rubber.

In the production of spherical silicon micro powder, spherical silicon powder refers to amorphous quartz powder material with spherical particle and main composition of silica. Its production raw materials are mainly angular silicon powder, and the production methods include flame melting, plasma heating furnace, chemical combination and hydrolysis. At present, the domestic main use of flame melting method to produce spherical silicon micro powder. The key of this technology is that the heating device requires stable temperature field, easy to adjust temperature range and avoid secondary pollution to silicon powder.

In addition, the process of producing spherical silicon powder by high frequency plasma melting is also mentioned. The hydrolysis method is to add liquid SiCl4 to deionized water with different dispersants at a constant speed, and stir the hydrolysate at high speed with quartz bar at the same time. After aging, washing and filtration, the hydrolyzed product is dried and dehydrated in a constant temperature box at 100 ℃ -200 ℃ to constant weight, and transferred to the high temperature sintering furnace. The high temperature sintering dehydroxidation and crystal shape are carried out at different temperatures After grinding and screening, the high purity spherical silicon powder with the required particle size was obtained.

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