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Mill Critical Speed Determination The Critical Speed for a grinding mill is defined as the rotational speed where centrifugal forces equal gravitational forces at

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This formula calculates the critical speed of any ball mill Most ball mills operate most efficiently between 65 and 75 of their critical speed

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The critical speed of ball mill is given by where R = radius of ball mill r = radius of ball For R = mm and r = 50 mm n c = 307 rpm

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Critical Speed of Ball Mill For a ball mill it does not have a constant critical speed because of the centrifugalization of the steel balls is different accor

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