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May 18, 2020 ... grinding circuit and varying cement ball mill speed as well as an air classifier speed at ... mill 15 . Too much passage at the critical speed may.

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Practically, mill speed between 68 and 82% of critical speed. · % critical speed is the mill actual speed in RPM divided by nc.

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The critical speed rpm is given by: nC = 42.29/ d, where d is the internal diameter in metres. Ball mills are normally operated at around 75% of critical speed, so...

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