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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 shell s inside surface This is the rotational speed where balls will not fall away from the mill s shell Mill Inside Diameter Enter the mill diameter inside the shell

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The theoretical critical speed of a ball mill is the speed at which the balls time of grinding particle density and speed of the ball mill rpm

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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

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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 But the mill is operated at a speed of 15 rpm Therefore the mill is operated at 100 x 15 30 7 48 86 of critical speed If 100 mm dia balls are replaced by 50 mm dia balls and the other conditions

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