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The point where the mill becomes a centrifuge is called. the critical speed, and ball mills usually operate at 65%. to 75% of the critical speed. Ball mills are generally used. to grind material 1/4 inch and finer, down to the particle.

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The Critical Speed is used for the determination of ball mill ideal operating speed. But for comparison, rod mills would operate between 50% to 95% of the critical speed.

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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 = 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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