Metal silicon powder production process and device

Abstract

The invention relates to a metal silicon powder production process. The metal silicon powder production process includes: silicon blocks are primarily crushed by a hammer type crusher, the crushed silicon blocks enter a crushed material bin through a first bucket type elevator, and the crushed silicon blocks are pulverized in a vertical type pulverizer into pulverized materials; the mixed coarse powder of the pulverized materials is fed into a square swing screen through a second bucket type elevator and screened, the finished powder screened to the lower portion of the square swing screen is stored in a finished product bin, and the coarse powder remained on the square swing screen is returned to the vertical type pulverizer through a third bucket type elevator for secondary pulverizing; the fine powder of the pulverized materials are collected by a cloth bag dust collector to enter a fine powder bin, and fine powder is packed for sale. A metal silicon powder production device comprises the hammer type crusher, the first bucket type elevator, the vertical type pulverizer, a second bucket elevator, the cloth bag dust collector, the third bucket type elevator and the square swing screen.

Description

technical field [0001] The invention relates to a process for preparing metal silicon powder and a device for preparing silicon powder. Background technique [0002] Silicon powder processing refers to the process of crushing smelted silicon blocks (25~80mm) through a special process to produce silicon powder with a specified particle size (usually 80~400μm). 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 reactivity of metal silicon powder. 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 shape and specific surface area, thereby directly affecting the chemical reactivity of metal ...

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

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