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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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The critical speed of ball mill is given by, where R = radius of ball mill; r = radius of ball. For R = 1000 mm and r = 50 mm, n c = 30.7 rpm.
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For instance a 90cm diameter ball mill with a critical speed of 44 rpm has an optimal speed of 31 to 33 rpm.