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The grinding is performed by stone, metal or rubber balls that are free to move in the cylinder (Figure 1). The balls form around 40 to 45 percent of the load.

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The motion states of grinding media are determined by unbalance force and unbalance moment in the ball mill. The performance of movement consist of "revolution"(rotation around the centre of the cross-section of the mill) and "rotation"(rotation around the centre of grinding media itself), as shown in Fig.4.

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