The effect of the fraction of mill critical speed (Oc) on the grinding for model parameter aT was found to be different for two different samples: aT=0 0344 exp(0 00301 Oc) for clinker and aT=0 0225 exp(0 06183 Oc) for limestone Additionally it was found in this study that optimum grinding occurs at Oc=85 in contrast to the 70 of critical speed of the ball mill in the cement factory
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View MoreCement Mill Critical Speeed And Effect The point where the mill becomes a centrifuge is called the critical speed and ball mills usually operate at 65 to 75 of the critical speed ball mills are generally used to grind material 14 inch and finer down to the particle size of 20 to 75 microns Cement Mill Critical
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View MoreCement Ball Mill Calculation Jan 07 2015 Raw mills usually operate at 7274 critical speed and cement mills at 7476 3 2 Calculation of the Critical Mill Speed G weight of a grinding ball in kg w Angular velocity of the mill tube in radialsecond w 23 14n60 Di inside mill diameter in meter effective mill diameter n Revolution per minute in rpm
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View MoreCritical speed is the speed at which the centrifugal force is equal to the gravitational force Normal mill speed is 70 to 80 of the critical speed (Fig 1 3) For example if the critical speed is 18 rpm mill speed will be 15 rpm If your mill speed is than the critical speed and
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