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Get PriceWith critical speed (rpm) denoted by formula nC = 42.29/vd (d is internal diameter in meters), a mill with diameter of 5 meters will turn at around 14 rpm These can be used for grinding material that is 1/4 inch and finer (can grind down to particle size of 20 to 75 microns)

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Get PriceMar 31, 2008There exists a speed of rotation (the critical speed) at which the contents of the mill would simply ride over the roof of the mill due to centrifugal action. The critical speed (rpm) is given by nC = 42.29/√d, where d is the internal diameter in metres.

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Get Price13 and 30 rpm. The smaller grinding mills are operated at the faster speeds. One formula used to calculate critical speed is N = 42.3 D-d' where N = critical speed of grinding mill (rpm), D = mill diameter (meters), d = diameter of largest ball (meters).

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