This ‘critical speed’ is defined as 42.3 divided by the square root of the internal diameter of the mill (in metres), and the rotational speed of most mills is kept within 65–80 per cent of the critical speed.
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Get PriceThe formula to calculate critical speed is given below. N c = 42.305 /sqt(D-d) N c = critical speed of the mill. D = mill diameter specified in meters. d = diameter of the ball. In pract Ball Mills are driven at a speed of 50-90% of the critical speed, the factor being influenced by economic consideration. More. Get Price
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Get PriceThe "Critical Speed" for a grinding mill is defined as the rotational speed where centrifugal forces equal gravitational forces at the mill shell's inside surface. This is the rotational speed where balls will not fall away from the mill's shell. Result #1: This mill would need to spin at RPM to be at 100% critical speed.
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Get PriceThe critical speed (rpm) is given by: nC = 42.29/ √d, where d is the internal diameter in metres. 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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