# Derive An Expression For Calculating The Critical Speed Of A Ball Mill:

##### Ball Mill Critical Speed - Mineral Processing

A Ball Mill Critical Speed (actually ball, rod, AG or SAG) is the speed at which the centrifugal forces equal gravitational forces at the mill shell’s inside surface and no balls will fall from its position onto the shell.

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

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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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TECHNICAL NOTES 8 GRINDING RP King - Mineral Technologies . The critical speed of the mill, &c, is defined as the speed at which a single ball will just remain against the wall for

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