Abstract
The Szego Mill is a planetary ring-roller mill with radially mobile, helically grooved rollers. It has a high capacity for its size and is suitable for continuous dry or wet grinding, including pastes with high solids concentration. It reduces size rapidly, and with a relatively low power consumption. In this paper, results for mica grinding are presented for both dry and wet operation. Particle size distribution, power consumption and mean particle aspect ratios are correlated with operating conditions, including use of special rollers to enhance shearing and flake delamination. Aspect ratios in the 30–40 range can be attained; for grinding to 15 μm median size, the specific energy requirement is about 80 kWh/t.
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