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Mill Critical Speed Determation The "Critical Speed" for a grdg mill is defed as the rotational speed where centrifugal forces equal gravitational forces at the mill shell's side surface. This is the rotational speed where balls will not fall away from the mill's shell.

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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 the 60 to 68 percent critical speed range.

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Ball Mills - Me Engeer.Com 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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Ball Mills - Me Engeer.Com 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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Mill Speed - Critical Speed Mill Speed No matter how large or small a mill, ball mill, ceramic led mill, pebble mill, jar mill or laboratory jar rollg mill, its rotational speed is important to proper and efficient mill operation.

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Calculations: The critical speed of ball mill is given by, where R = radius of ball mill; r = radius of ball. For R = 1000 mm and r = 50 mm, n c = 30.7 rpm. But the mill is operated at a speed of 15 rpm. Therefore, the mill is operated at 100 x 15/30.7 = 48.86 % of critical speed.

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When the ball mill rotates at the critical speed the theoretical trajectory of the charge is such that it would fall outside the shell as centrifugg occur at this stage and the medium is carried around a fixed position agast the shell. The formula to calculate critical speed is given below. N c = 42.305 /sqt(D-d) N c = critical speed of the mill.

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The formula to calculate critical speed is given below. N c = 42.305 /sqt(D-d) N c = critical speed of the mill. D = mill diameter specified meters. d = diameter of the ball. In practice Ball Mills are driven at a speed of 50-90% of the critical speed, the factor beg fluenced by economic consideration.

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