Preparation method of high spheroidization rate nanometer silicon micropowder

Abstract

The invention belongs to the technical field of nanometer silicon micropowder preparation, and more specifically relates to a preparation method of a high spheroidization rate nanometer silicon micropowder. The preparation method comprises following steps: a quartz sand raw material is subjected to coarse crushing, magnetic selecting, and acid pickling to remove impurities, an ammonium chloride and sodium hydroxide solution are added for mixed ball milling, an obtained grinding slurry is filtered and sintered, iron removing is carried out, a methanamide solution of hexamethyldisiloxane is added for ball milling, after ball milling, far infrared ray irradiation at 80 to 90 DEG C is carried out for 30 to 40s, and high performance ball milling or supersonic speed grinding is carried out untilparticle size ranges from 3200 to 3800 meshes so as to obtain a finished product. Compared with the prior art, the preparation method possesses following advantages: the whiteness and the spheroidizing rate of amorphous nanometer silicon powder are increased, the spheroidizing rate is high, few impurity elements are contained, excellent dispersibility and fluidity are achieved, the preparation method is simple, the conditions are simple and are easy to control, the quality of obtained products is stable, yield is high, the applicability is high, and the preparation method is suitable for popularization.

Description

technical field [0001] The invention belongs to the technical field of preparing nano-silicon powder, and in particular relates to a preparation method of nano-silicon powder with high spheroidization rate. Background technique [0002] With the advancement of technology, high-tech products have higher and higher requirements for raw material quality. Quartz sand products are limited in purity and particle size, and generally can only be used as raw materials for glass or ceramics, which cannot meet the high-purity and fine quality requirements of new industries. Due to the huge demand of the market, research on the preparation of high-purity ultrafine silica powder has gradually begun at home and abroad. Now the preparation of high-purity ultrafine silica powder generally includes the sol-gel method. The preparation process is complicated and the preparation cost is high. To a certain extent, the promotion and application of nano-silica powder is restricted. Therefore, it i...

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Problems solved by technology

[0002] With the advancement of technology, high-tech products have higher and higher requirements for raw material quality. Quartz sand products are limited in purity and particle size, and generally can only be used as raw materials for glass or ceramics, which cannot meet the high-purity and fine quality requirements of new industries. Due to the huge demand of the market, research on the preparation of high-purity ultrafine silica powder has gradually begun at home and abroad. Now the preparation of high-purity ultrafine silica powder generally includes the sol-gel method. The preparation process is complicated and the preparation cost is high. To a certain extent, the popularization and application of nano-silica powder is restricted. Therefore, it is of great economic and social benefit to find a method for preparing nano-silica powder with simple process and low cost. Ultrafine pulverization of quartz powder is the possibility of living nano-silica powder. One of the processes, the mechanical pulverization method currently used is to ultrafinely pulverize large-grained silica through the combined effects of impact, shear, friction and other forces generated by the superfine pulverization machine. The production process is easy to control, but the raw material requirements Higher, and as the particle size decreases, the particles will agglomerate due to the increase in surface energy, and it is difficult to further reduce the particle size of the powder. Therefore, further research on the preparation method of silicon micropowder is required.