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Posted at: July 30, 2012. Ball mill – Wikipedia, the free encyclopedia The critical speed can be understood as that speed after which the steel…

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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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For instance a 90cm diameter ball mill with a critical speed of 44 rpm has an optimal speed of 31 to 33 rpm.

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Rod mills operate at lower speed than ball mills since the rods are rolled and not … The Critical Speed is used for the determination of ball mill ideal operating …

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Consequently, it has proven best to describe the speed instead of referring to their percentage of critical speed as is done for ball mills of the same diameter.

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This formula calculates the critical speed of any Ball mill. Most ball mills operate most efficiently between 65% and 75% of their critical speed.

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The stage where the mill turns into a centrifuge is known as the “Critical Speed”, and vibrating ball mills usually operate at 65% to 75% from the critical speed.