Effect of Grinding Medium Density on Reducing Rate of Coarse Particles by Dry Grinding Using Methanol as a Grinding Aid

In this study, we conducted dry grinding tests of silica glass using a laboratory ball mill with and without methanol as well as wet grinding tests. We found that in the early stage of grinding the dry grinding with methanol reduces the coarse feed particles (1, 180-1, 000μm) at a faster rate than dry grinding without methanol and wet grinding. We also investigated the effect of grinding medium density on the reduction rate of coarse particles with size from 1, 000 to 75μm by conducting dry grinding tests with methanol using alumina or zirconia balls. The zirconia balls were more effective for shortening the grinding time than the alumina balls, whereas the alumina balls lowered the input energy required.