Abstract
The grinding of talc was carried out under reduced pressure using a hammer screen mill which was putting into a vacuumn vessel. The effect of the pressure of the atmosphere on the grinding efficiency was investigated experimentally. The grinding conditions were from 0.08 to 93.3kPa in the vacuum vessel.Finer products were obtained as the pressure of the atmosphere decreased. In particular, the particle size of the products was greatly influenced when the pressure of the atmosphere was less than 2.67kPa. The ratio of the incremental specific surface area produced by grinding less than 2.67kPa to that at 93.3kPa has a tendency to increase with decreasing particle size. On the other hand, the influence of the opening size of the screen on the size distribution of products at 0.08kPa was recongized. Therefore, grinding under a reduced peesure, where the friction drag of the air effect is negligible, is expected to be useful for improving grinding efficiency.
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