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Types and functions of grinding media

Category:Industry news Hits:146 Time:2022-04-22
According to the shape of grinding medium, it can be divided into ball, column (segment) and rod. According to the material classification, it can be divided into carbon steel ball, stainless steel ball, high chromium cast iron ball, corundum ball (alumina ball), glass ball, agate ball, zirconia ball, natural sand, etc.

At present, there is no satisfactory conclusion in theory about which shape of grinding medium is the best for the ultrafine grinding process and effect, which is also a controversial issue. However, at present, the spherical medium with relatively easy manufacture, relatively low cost and relatively unchanged shape in the crushing process is still used, and a small amount of cylindrical medium is used in the process. In micron or submicron or even nano powder dispersion, due to the small size of the grinding medium, spherical microspheres (or micro beads) can only be used at present.

The material of grinding medium is a very important problem in the process of ultra-fine comminution. It determines the cost, comminution efficiency and the quality of the final product.

In terms of crushing efficiency, in the grinding process, the density of the medium determines the strength of the impact force. Generally speaking, the greater the medium density, the stronger the grinding ability and the higher the crushing efficiency. For example, compared with alumina ball and glass ball, the grinding capacity of zirconia ball in ultra-fine stirring mill is more than a few digits.

Considering the cost of the processing process, the wear and crushing failure of the medium will cause the loss of the medium and increase the cost of the grinding and crushing process. Corundum, zirconia, glass and other materials are mostly used in chemical, fine ceramics and non-metallic mining industries. The selected medium should be determined according to the value of the ground material and the price of the medium, and the purity of the crushed product should also be considered.

Considering the quality of comminuted products, the medium is constantly worn in the comminution process, and the worn fine powder is distributed in the products. Therefore, the selection of medium material is very important in fine ceramics, new material preparation, non-metallic minerals and chemical industry. Ideally, it is hoped that no impurities will be added to the products. Therefore, zirconia balls are preferred in the crushing process of high-purity materials.