Ball milling apparatus for preparing nano silicon powder

Abstract

The invention discloses material ball milling apparatus, which comprises a cylinder. Two ends of the cylinder are provided with a material inlet and a material outlet. A first partition plate and a second partition plate are arranged in the cylinder. The first partition plate and the second partition plate are both provided with a filter hole. The diameter of the filter hole of the first partitionplate is greater than that of the filter hole of the second partition plate. The first partition plate and the second partition plate divide the cylinder into a first cylinder, a second cylinder, anda third cylinder. The inner walls of the first cylinder, the second cylinder, and the third cylinder are all provided with a wear resistant lining plate. The lining plates of the first cylinder and the second cylinder are both provided with embossments. Steel balls for grinding are placed in the first cylinder, the second cylinder, and the third cylinder. The steel balls in the first cylinder arein a cylindrical shape. The upper end and bottom end of each cylindrical ball body are connected to an arc end. The surfaces of steel balls in the second cylinder are provided with multiple embossments. The ball milling apparatus has the advantages of good ball milling effect and short ball milling time, moreover, the service life of lining plates is prolonged, and the ball milling apparatus is suitable for the preparation of nano level silicon powder.

Description

technical field [0001] The invention relates to the technical field of high-fineness powder ball milling devices, in particular to a ball milling device for preparing nano silicon powder. Background technique [0002] Nano-scale silicon powder is an indispensable material for the preparation of nano-silicon-magnesium solid-state batteries, and the nano-scale powder fineness plays a decisive role in promoting the performance of subsequent batteries. However, in the prior art, ball mills are After the material is crushed, it is the key equipment for crushing. It is widely used in non-ferrous metal beneficiation and other production industries. The existing ball mill generally uses the centrifugal force during rotation to lift the internal steel balls, and through the interaction between the steel balls and the materials. To crush. The sphere is generally made of metal or non-metallic materials, and rotates with the cylinder of the ball mill. The grinding body rotates, throws,...

AI Technical Summary

Problems solved by technology

The sphere is generally made of metal or non-metallic materials, and rotates with the cylinder of the ball mill. The grinding body rotates, throws, rolls, slides, etc. in the cylinder, and the grinding body and the material form a transfer of energy through impact and friction. , crushing materials by crushing and grinding, but because of the smooth surface of the existing grinding body, most of the energy is not utilized in the process of impact and friction, while the heat energy and sound energy are lost, and the effective utilization rate of energy is very low. Low, only 1-3%, the power consumption of the ball mill is high, and the barrel of the ball mill is also easily damaged. Some of them add a simple wear-resistant liner inside the barrel to prolong the service life of the barrel

[0003] Whether the wear-resistant liner has a completely smooth surface or some patterns are cast on the surface, its lifting effect on the grinding body basically depends on the static friction between the liner and the grinding body. The static friction coefficient of the wet ball mill is 0.35, and the static friction coefficient of the dry ball mill is 0.4. Since the static friction coefficient is much smaller than the actual need, it is inevitable that the grinding body will slide, which will reduce the lifting height of the liner and increase the wear of the liner and the ball. Reduce the grinding efficiency of the ball mill and increase the wear of the liner

In addition, in the existing ball mill, the materials of large particles, medium particles and small particles are mixed together and ground by a kind of steel ball, which not only takes a long time, but also the effect of ball milling is not very good. The powder is ground into nano-scale fineness to meet the nano-scale requirements of raw materials for nano-silicon-magnesium battery production

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