Influence of the hardness of grinding balls on ball milling

In order to be suitable for ball milling of various laboratory samples, the laboratory ball mill is equipped with grinding balls of various materials, including stainless steel grinding balls, alumina grinding balls, zirconia grinding balls, polyurethane grinding balls, cemented carbide grinding balls, etc. Wait. The grinding effect of each kind of grinding ball is different. Now let's discuss the influence of the hardness of the grinding ball on the ball grinding.

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In general, in the ball milling process, as the hardness increases, the wear of the grinding balls is required to decrease. At the same time, the deformation of the grinding ball is small, which reduces the energy absorbed by the deformation of the ball during the impact, and uses more energy to impact the particles, increasing the ball milling efficiency.

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But the fact is that the grinding ball is not as hard as possible, but has an optimum range. Grinding balls with higher hardness have lower wear, but for ball milling efficiency, when the ball hardness exceeds the optimum value, there will be adverse effects.

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There are basically two adverse effects of high hardness of the grinding ball: the rebound of the grinding ball is increased after impact, resulting in some energy loss, which reduces the energy used for ball grinding; grinding balls with higher hardness, the particles are squeezed between the balls When the sliding is severe, it cannot effectively grind the material.