Alumina grinding balls refer to materials such as bauxite, roller powder, industrial alumina powder, high-temperature calcined alpha alumina powder, etc. , firing and other processes, mainly as a ball stone widely used as a grinding medium. According to different alumina content, it can be divided into medium alumina ball, medium high alumina ball and high alumina ball.
Generally, we classify 60%-65% alumina content as medium-alumina balls, 75%-80% alumina content as medium-high alumina balls, and 90% or more alumina content as high-alumina balls. Among them, high alumina balls are subdivided into 90 porcelain, 92 porcelain, 95 porcelain and 99 porcelain. Due to its extremely high production cost, 99 porcelain is rarely produced in large quantities by large manufacturers. At present, it is mainly made by hand in some special ceramic factories.
Due to their low price, medium aluminum balls and medium high aluminum balls are accepted by most ceramic factories and are mainly used for grinding ceramic blanks. High alumina balls are widely used in different types of ceramics, enamel, glass, chemical industry, etc. The finishing and deep processing of thick and hard materials in the factory, among which the high aluminum ball with 92% content is the most commonly used.
1. Principle of ball mill media:
When the ball mill works, it relies on the impact and grinding of the medium on the material to complete the grinding of the material. In the mechanical process of the crushing of the material by the medium, the medium acts as an energy medium to convert the external energy into the crushing work of the material. It has a crushing effect on the material. Therefore, the size of the medium of the ball mill determines the energy carried by the medium, and is also related to the size of the crushing force on the material, which ultimately determines the grinding efficiency and product quality characteristics, and affects the power consumption and medium consumption of the equipment during operation. Therefore, the size of the medium is very important for the ball mill, and the selection of the medium size and the proper motion state of the medium have a considerable impact on the grinding process.
According to the shape of grinding media, it can be divided into three types: ball, column (segment) and rod. Classified by material, it can be divided into corundum balls (alumina balls), zirconium balls, silicon nitride balls, etc. During the grinding process, the density of the medium determines the strength of the impact force. Generally speaking, the greater the density of the medium, the stronger the grinding ability and the higher the crushing efficiency. Corundum, zirconia, glass and other materials are mostly used in the chemical industry, fine ceramics and non-metallic mineral industries. It is hoped that no impurities will be added to the product. In the crushing process of high-purity materials, zirconia balls are preferred.
3.Hardness of grinding balls:
Mohs hardness (Mohs) is a commonly used indicator. The harder the grinding ball is, the lower the wear rate of the ball is in theory.
4.Attention points when using grinding media for the first time:
4.1. Choose zirconium ball or glass ball according to the viscosity of the material
4.2. According to the particle size of the raw material and the required fineness of the product, select the ball with the appropriate size.
4.3. Check whether the aperture of the separator or screen of the grinder is properly selected, and the gap should be one-third of the diameter of the smallest ball. For example: using 1.2-1.4 mm beads, the gap should be 0.4 mm.
4.4. Try to avoid turning on the grinder in a dry state, which will cause unnecessary loss of balls and accessories.
4.5. Balls of different brands cannot be mixed.
4.6. Try to avoid mixing large and small balls.
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