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Jan 01, 2016· At θ = 0, cos θ =1, the force of gravity tending to pull the ball off the wall will be at a maximum and the speed required to overcome this force is known as the critical speed. Denoting the critical speed as v C, we can replace the speed v with v C and the radius of the path ( R – r ) may be re-written as ( D – d )/2.

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Aug 26, 2014· Mill liner thickness = 40mm = 0.04m Mill speed = 77% of the critical speed Critical speed (Nc) is the speed at which the centrifugal force is equal to the gravitational force. Nc = 42.3 /D1/2 D is the effective diameter of mill = Mill diameter – Liner thickness = 4.6 – (0.04x2) = 4.52m Nc = 42.3 / 4.521/2 = 19.89 rpm Mill speed = 0.77 x 19 ...

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Aug 03, 1999· To examine the dependence of critical rotation speed on ball-containing fraction, we measured critical speeds at various ball-containing fractions from 0.3 to 0.95 stepped by 0.05. Since at lower fraction than 0.3 we could not observe the centrifugal motion, we chose this fraction range. A jar of ball-mill consists of a cylinder and two lids.

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Jan 30, 2018· The critical speed of the ball mill is the speed at which the centrifugal force is equal to the gravity on the inner surface of the mill so that no ball falls from its position onto the mill shell. Ball mill machines usually operates at 65-75% of critical speed.

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A Ball Mill Critical Speed (actually ball rod AG or SAG) is the speed at which the centrifugal forces equal gravitational forces at the mill shell s inside surface and no …

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8-3 Centrifugal force outward Fc mp& 2 Dm 2 (8.1) & is the angular velocity, mp is the mass of any particle (media or charge) in the mill and Dm is the diameter of the mill inside the liners. Gravitational force Fg mpg (8.2) The particle will remain against the wall if these two forces are in balance ie.

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The critical speed of the ball mill is the speed at which the centrifugal force is equal to the gravity on the inner surface of the mill so that no ball falls from its position onto the mill shell. Ball mill machines usually operates at 65-75 of critical speed.

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