Grinding kinetics of calcined alumina

Conclusions

If it is necessary to obtain a mineral powder with a high dispersion (α_mean ≤ 1 μ), it is technically-undesirable and economically unsuitable to increase the quantity of grinding bodies by more than four times with respect to the weight of α-Al₂O₃.

Silicone oil is a suitable surface active agent for carrying out effective dry grinding of α-Al₂O₃.

With the dry grinding of α-Al₂O₃ using metal grinding bodies, the iron pickup is approximately ten times greater than with wet grinding. During the dry grinding of α-Al₂O₃ with an addition of silicone oil, and corundum grinding bodies, the rate of grinding is the same as with wet grinding using metal grinding bodies.