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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 direct measurement of the ball level in the mill, more accurate than power readings, ... (plan a liner change and/or change mill speed if possible).

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In a ball mill of diameter 2000 mm, 100 mm dia steel balls are being used for grinding. Presently, for the material being ground, the mill is run at 15 rpm.

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