The requirements for the fineness of materials are becoming increasingly high, and the use of sand mills is becoming more and more common. There are also many grinding media available in the market. How to choose a suitable grinding medium for one's own production process and premise is briefly explained in the following aspects.

1. Density of grinding medium
The density in the document is implied by the specific gravity (true specific gravity) and bulk weight (false specific gravity). The molecular weight and percentage composition of various oxides determine the density of grinding. In general, the larger the specific gravity of the grinding beads, the greater the impulse, and the higher the grinding efficiency. However, the relative wear force on the inner cylinder, separation plate, and other components of the sand mill is relatively large, so the combined viscosity and flow rate of the slurry become crucial. Low density grinding beads are suitable for low viscosity slurries, while high-density grinding beads are suitable for high viscosity slurries.

2. Hardness of grinding medium
Mohs and Vickers hardness are commonly used indicators, and the higher the hardness of the grinding bead, the lower the wear rate of the bead does not necessarily mean.

3. Particle size of grinding medium
The size of the grinding bead determines the grinding bead and material. The smaller the particle size of the bead, the more points of contact it has in terms of communication volume, and theoretically, the higher the grinding efficiency; On the other hand, when grinding materials with high particle specific force in the initial test, for example, for a 100 micron slurry, beads with a diameter of D=1mm are not necessarily used because the impulse of the small beads cannot reach the energy required to enrich the grinding separation. Therefore, beads with larger particle sizes should be accepted.