Torque Speed Calculation For Ball Mill

Ball mil design calculation yahoo answersar 31, 2008 the critical speed rpm is given by nc 4229 d, where d is the internal diameter in metres ball mills are normally operated at around 75 of critical speed, so a mill with diameter 5 metres will turn at around 14 rpm the mill is usually divided into at least two chambers, allowing the use of different sizes of grinding media.

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