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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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The critical speed of a ball mill is calculated as 54.19 divided by the square root of the radius in feet.

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/S"1 International Mining Congress and Exhibition of Turkey-IMCET 2003, (c 2003. ISBN 975-395-605-3 The Effect of Fraction of Mill Critical Speed on Kinetic Breakage ...

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