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•ball mills operate between 65 and 80% solids by weight, depending on the ore. • the speed of a ball mill is in the range 70 80 % of the critical speed.

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in case peripheral speed of mill is very high, it acts like centrifuge where balls do not fall back and stay on perimeter of mill (this point is called "critical speed" ball mills normally operate at 65% to 75% of critical speed)

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mill liner thickness = 40mm = 0.04m mill speed = 77% of the critical speed critical speed (nc) is the speed at which the centrifugal force is equal to the gravitational force. nc = 42.3 /d1/2 d is the effective diameter of mill = mill diameter – liner thickness = 4.6 – (0.04x2) = 4.52m nc = 42.3 / 4.521/2 = 19.89 rpm mill speed = 0.77 x 19

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