Metal silicon powder preparation process and equipment

Abstract

The metal silicon powder preparation process of the present invention, firstly, the silicon block is primary pulverized by a hammer crusher, enters the crushed material bin through the first bucket elevator, and then is sent into a vertical pulverizer for grinding and pulverizing into pulverized materials; the pulverized materials The mixed coarse powder is sent to the square swinging sieve for screening by the second bucket elevator, the finished powder sieved to the lower part of the square swinging sieve is stored in the finished product warehouse, and the coarse powder remaining in the upper part of the square swinging sieve is sent to the third bucket elevator Return to the vertical grinder for re-crushing; the fine powder of the crushed material is collected by a bag vacuum cleaner and entered into the fine powder bin to package the fine powder for sale. The metal silicon powder preparation device of the present invention includes a hammer crusher, a first bucket elevator, a vertical pulverizer, a second bucket elevator, a bag vacuum cleaner, a third bucket elevator and a square swinging screen.

Description

Technical field [0001] The invention relates to a preparation process of metal silicon powder and a device for preparing silicon powder. Background technique [0002] Silicon powder processing refers to the process of crushing the smelted silicon block (25~80mm) through a special process to produce silicon powder with a specified particle size (usually 80~400μm). The metal silicon powder used in the production of organic silicon and polysilicon must have corresponding technical indicators. The key technical indicators of metal silicon powder: chemical composition, particle size, morphology, specific surface area, and physical and chemical properties reflect the chemical reaction activity of metal silicon powder. The key technical indicators are an important basis for the production of high-quality organic silicon and polysilicon. [0003] The particle size index of silicon powder directly affects its morphology and specific surface area, thereby directly affecting the chemical rea...

AI Technical Summary

Problems solved by technology

Since the particles pulverized by the mechanical mill are mixed particle sizes, the coarse and fine powders are mixed together, and the fine powder is easy to adhere to the coarse particles when sieved by a linear vibrating sieve, and it is difficult to sieve, and the retention of the material on the sieve If the time is long, the wear on the screen is greater, the screening efficiency is relatively low, and more ultra-fine powder adheres to the qualified particles, which will affect the product quality

[0016] In summary, in the silicon powder preparation process, the use of jaw crushers and linear vibrating screens reduces the production capacity and first-time yield of silicon powder

Images