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Ball Mill Critical Speed 911 MetallurgistMar 17 2017 The critical speed of a rotating mill is the RPM at which a grinding This method only gives a rough and initial idea for sizing a cement ball mill Modern mills have a speed of rotation between 70 and 75% of the critical speed Ball millPyroData A ball mill a

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The critical speed of the mill &c is defined as the speed at which a single ball will just remain against the wall for a full cycle steel balls in a ball mill or large lumps of ore in an autogenous mills calculated using the formulas of Austin

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