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In this study the effects of GA on transportation rate of the ground material inside the cement ball mill and the effects of this change on the whole grinding circuit were investigated In this context industrial tests were carried out with three different dosages of an amine based commercial GA in a closed circuit cement ball mill.

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Raw mills usually operate at 72 74 critical speed and cement mills at 74 76 3.2 Calculation of the Critical Mill Speed G weight of a grinding ball in kg w Angular velocity of the mill tube in radial/second w = 2 3.14 n/60 Di inside mill diameter in meter effective mill diameter n Revolution per minute in rpm.

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