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  3. Mills Are Operated At Or Below The Critical Speed To Prevent What

Mills Are Operated At Or Below The Critical Speed To Prevent What

Feb 13, 2017 Rod mills generally operate within the range of 60—75 % of critical speed in order to avoid excessive wear and tangled rods. Ball and pebble mills are usually operated at 70—85 % of critical speed. For dry grinding the speed is usually somewhat lower. Critical speed graph. Example : A mill with 4.5 m dia (15′) N obtained = 20 rpm. If N ...

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