The sand mill converts chemical energy into pulverizing energy for raw materials according to grinding. The relative density, strength, particle size and filling rate of grinding directly affect the grinding efficiency of the sand mill.
1. Relative density
Relative density is expressed in relative density and apparent density in general documents. The content and percent composition of various compounds determine the relative density of zirconia beads.
Generally speaking, the higher the relative density of zirconia beads, the greater the mechanical energy caused by the rotation of the sand mill, and the higher the grinding efficiency. However, at the same time, the greater the relative density of the grinding medium, the greater the damage to the contact parts of the sand mill. Therefore, the interaction between the viscosity of the raw material and the total flow becomes the key.
2. Strength
Mohs hardness and Vickers hardness are common index values. Generally speaking, the higher the strength of zirconia beads, the lower the friction coefficient ratio of the beads. From the damage of the zirconia beads to the contact parts of the sand mill, the stronger zirconia beads will damage the contact parts more.
3. Granularity
The size of the zirconia beads determines the point contact between the beads and the raw materials. The larger the point contact of the beads with smaller particle size is under the same capacity, the greater the reasonable impact frequency during the whole grinding process, and the higher the grinding efficiency. Also the higher.
4. Effective charging rate
The filling rate of zirconia beads is the total number of grinding beads required by the sand mill to achieve the best dispersion and grinding effect. If the filling rate of the grinding beads is too high, it is very easy to cause the internal temperature of the sand mill to rise, causing the machine to automatically switch on and off.
The filling rate of grinding beads is too low, the grinding efficiency is low, and the dielectric loss is large. Therefore, the effective filling rate is one of the key factors to improve the grinding efficiency of zirconia beads.
