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Ball charge is about 4050% of mill by vol. 4050% of this is voids. Most efficient (power consumption wise) at 50% ball charge. Higher ball charge results in higher required optimum speed (cataracting reduces with increased ball charge as mill gets heavier). Media can be different in shape from spherical. Cylpebs are cylindral media, with D/H = 1. Produced slightly coarser product than balls.

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