How do we choose a suitable grinding medium when using a sand mill? The following aspects should be considered when selecting grinding media.
1. Density of grinding beads
Density is usually expressed in terms of specific gravity (true specific gravity) and bulk density (false specific gravity), and the molecular weight and percentage composition of various oxides determine the density of grinding.
Under normal circumstances, the larger the specific gravity of the grinding beads, the larger the impulse, the higher the grinding efficiency, and the wear of the contact parts (inner cylinder, dispersing disc, etc.) of the sand mill is relatively large, so the viscosity of the slurry and the flow rate are matched. Become Guan Jian. Low-density grinding beads are suitable for low-viscosity slurries, and high-density grinding beads are suitable for high-viscosity slurries.
2. Hardness of grinding beads
Mohs hardness is a commonly used indicator. The higher the hardness of the grinding beads, the lower the wear rate of the beads in theory.
For example, from the wear of the grinding beads to the contact parts of the sand mill (dispersing disc, rod pin and inner cylinder, etc.), although the abrasive beads with high hardness have greater wear to the contact parts, it can be adjusted by adjusting the filling amount of the beads. , the viscosity and flow of the slurry can reach the optimal point.
3. The particle size of the grinding beads
The size of the grinding beads determines the number of contact points between the grinding beads and the material. The more contact points the beads with smaller particle size have under the same volume, the higher the grinding efficiency in theory. For example, for 100-micron slurry, the reason is that the impulse of the small beads cannot reach the energy of grinding and dispersing, and the beads with larger particle size should be used at this time.
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