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ATTRITORS AND BALL MILLS HOW THEY WORK Robert E. Schilling , ... The theoretical critical speed of a ball mill is the speed at which the centrifugal force is

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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 ...

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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.