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how i calculate the optimam speed of a ball mill. The optimum ball milling speed of the ore was found to be 82.9% of the critical mill,. coal uses Macam Macam Jenis Mesin Grinding Untuk . tanaman tambang .,slurry pump suppliers 145×145 secondary hammer crusher sand processing .Optimum choice of the make-up ball sizes for maximum,,However, these parameters are sensitive to milling conditions such as the mill rotational speed, ball filling, powder filling, mill diameter, and ball diameter. Therefore, they must be appropriately corrected in order to be used for large-scale industrial mills operating under different conditions.Ball Mills - Mine Engineer.Com,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 1/4 inch and finer, down to the particle size of 20 to 75 microns.