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The ball mills are operated at a ball charge volume of 30–32 and 78.5 critical speed The SAG mill trommel undersize is combined with the ball mills discharge and pumped to two parallel packs clusters of twelve 660 mm diameter cyclones The cyclone underflow from each line reports to a ball mill while the cyclone overflow is directed

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During use ball mills are set to rotate below critical speed for efficiency At critical speed the steel balls inside the tube cease to mill and are pressed against the tube s walls as shown below in Illustration 1 As a result many mills are set to rotate at approximately 70 80 of critical speed.1 A mill s critical speed is calculated

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Chat Online### Ball Mill Critical SpeedMineral Processing Metallurgy

Ball mills have been successfully run at speeds between 60 and 90 percent of critical speed but most mills operate at speeds between 65 and 79 percent of critical speed Rod mills speed should be limited to a maximum of 70 of critical speed and preferably should be in

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