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.
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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