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### critical speed equation for ball mill

#### formula to calculate critical speed in ball mill

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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critical speed calculation formula of ball mill . Ball Mill Operating Speed Mechanical Operations Solved Problems . Sep 11, 2014 Presently, for the material being ground, the mill is run at 15 rpm.

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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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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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