The pulverization and dispersion of the material by the ultrafine grinding equipment is mainly achieved by the grinding medium, so the grinding medium has a great influence on the ultrafine pulverization process. This article will focus on the impact of the hardness and density of the grinding media on the ultrafine.
Grinding media can be divided according to their size and grinding beads grinding balls, the material can be divided according to their zirconia, zirconium silicate, aluminum oxide quality, kaolin and other. The density and hardness of the grinding media play an important role in the grinding efficiency. The higher the density of the medium, the higher the grinding efficiency; the higher the hardness and the smaller the abrasion, the easier the purity of the product is guaranteed. However, under the condition that the specific gravity and viscosity of the slurry are constant, the density and hardness of the grinding medium are not as high as possible. Excessive density and hardness not only increase the cost, but also have the following adverse effects:
1) When the concentration and viscosity of the slurry are constant, the excessively high density of the grinding medium will mostly sink to the bottom of the barrel, causing uneven distribution of the grinding medium in the barrel, and the greater the difference in density, the more unreasonable the distribution. Under normal working conditions, under the joint action of gravity and centrifugal force, the stroke between the grinding media of the host bottom is reduced, the impact strength is weakened, the probability of the grinding media being squeezed between each other is increased, the energy consumption of the grinding medium is increased, and the grinding efficiency is lowered. It may even cause the maximum particle size of the product to go out of control.
2) When the difference between the specific gravity of the slurry and the density of the grinding medium is too large, a large amount of grinding medium sinks to the bottom, which not only affects the reasonable distribution of the grinding medium in the barrel, but also makes the host start again difficult.
3) The hardness is large, the toughness is inferior, and the impact resistance is also poor. While the grinding medium impacts the material to be ground at a high speed, it is also easy to cause its own crushing, increasing the possibility that itself and other grinding media are crushed.
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