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It is easy to determinate the behaviour of balls in ball mills with small dimensions in the laboratory. When the dimensions of ball mills increases it is very difficult to establish the particularly behaviour of balls in real ball mills. It is very difficult to determine the impact force between the grinding material and the balls or the grinding material and the inside layer of the mill. Therefore we can study and make a numerical analyses of the behaviour of balls, without high costs, without laboratory experiments, and miniaturized ball mills. The parameters that influence the process of grinding are easy to determine. The numerical simulation has a lot of advantages because we applied the law of physics. The measurements of the impact forces between the grinding material and the balls or the grinding material and the mill’s body are done using sensors.

THE VARIATION OF MASS CENTER AND THE INFLUENCE OF THE GRINDING PROCESS IN BALL MILLS