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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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    The formula to calculate critical speed is given below. N c = 42.305 /sqt(Dd) N c = critical speed of the mill. D = mill diameter specified in meters. d = diameter of the ball. In practice Ball Mills are driven at a speed of 5090% of the critical speed, the factor being influenced by economic consideration.

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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, nc = 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.

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    Mill Critical Speed Determination. The "Critical Speed" for a grinding mill is defined as the rotational speed where the formula used for Critical Speed is: N c

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    Ball mills have been successfully run at speeds between 60 and 90 percent of critical speed, but most mills operate at speeds between 65 and 79 percent of critical speed. Rod mills speed should be limited to a maximum of 70% of critical speed and preferably should be in the 60 to 68 percent critical speed range.

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    Ball mills have been successfully run at speeds between 60 and 90 percent of critical speed, but most mills operate at speeds between 65 and 79 percent of critical speed. Rod mills speed should be limited to a maximum of 70% of critical speed and preferably should be in the 60 to 68 percent critical speed range.

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  • SAGMILLING.COM .:. Mill Critical Speed Determination

    Mill Critical Speed Determination. The "Critical Speed" for a grinding mill is defined as the rotational speed where the formula used for Critical Speed is: N c

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