Ball Mills & Separators | PDF | Mill (Grinding) | Applied ...
over the roof of the mill due to centrifugal action. The critical speed (rpm) is given by: nc = 42.29/√d. Where "d" is the internal diameter in meters. Ball mills are normally operated at around 75% of critical. speed, so a mill with diameter 5 meters will turn at around. 14 rpm. ffDESIGN CRITERIA FOR BALL MILL.
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