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Ball mills are normally operated at around 75% of critical speed, so a mill with diameter 5 metres will turn at around 14 rpm.

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fCs – Fraction of critical speed Ss – Ball … of two or more grate discharge ball mills in series. The same equation is used to calculate the power that each ball mill …

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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.

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