· The critical speed (rpm) is given by: nC = /√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. The mill is usually divided into at least two chambers, allowing the use of different sizes of grinding media.
A lot of people use 60 rpm or some more, if 50 is not enought i will change my driven pulley with another one of 40 mm or less to increase the speed. Sorry for my bad English . Calculation of optimum speed depends on knowing the media diameter and jar also.
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Rod mills are very similar to ball mills, except they use long rods for grinding media. The rods grind the ore by tumbling within the the mill, similar to the grinding balls in a ball mill. To prevent the conditions leading to rod charge tangling, the length to diameter ratio is maintained at to
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