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Ball Mills Mine EngineerCom ball mill critical speed derivation If the peripheral speed of the mill is too great it begins to act like a centrifuge and the balls do not fall back but stay on the perimeter of the mill The point where the mill becomes a centrifuge is called the Critical Speed and baAir dragThe second is air drag which ### Critical Speed Of Ball Mill Formula And Derivation

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The critical speed of ball mill is given by where R = radius of ball mill r = radius of ball For R = mm and r = 50 mm n c = 307 rpm ### critical speed of ball mill formula and derivation

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