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The specific rates of breakage of particles in a tumbling ball mill are described by the equation S i = ax α i (Q(z), where Q(z) is the probability function which ranges from 1 to 0 as particle size increases.

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Figure 8.4 The effect of mill speed on the power drawn by a rotating mill. The liner profile and the stickiness of the pulp in the mill can have a significant effect on the actual critical velocity. Mills usually operate in the range 65 - 82% of critical but values as high as 90% are sometimes used. A crucial parameter that defines the performance of a mill is the energy consumption. The power ...

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Effect of ball size distribution Austin et al. Table 1 gives some speciﬁcations of the mill and the operating conditions as deﬁned for the experiments. Speciﬁcally. two mixes were considered: 1. ball sizes could ﬁnally be determined.2 mm. With the ball density (7. balls were individually weighed and their mass recorded.

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For each grain size there is an optimal ball size (Trumic et. al., 2007). The bigger ball in relation to the optimal one will have an excess energy, and consequently, the smaller ball mill has less energy necessary for grinding.

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Furthermore, as mill performance is related to the complete size distribution of the feed material, all preceeding stages of comminution and classification which influence feed size distribution will have an effect on the performance of the grinding machine.

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SHAPES ON BALL MILL PERFORMANCE Niyoshaka Nistlaba Stanley Lameck A dissertation submitted to the Faculty of Engineering and The Built Environment, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Engineering Johannesburg, October 2005 . i Declaration I declare that this dissertation is my own unaided work. It …

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size ball mill was used with ball media of sizes 10 mm, 20 mm and 30 mm respectively. Quartz was the material Quartz was the material used to perform the experiment and was arranged into 3 mono-sizes namely -8 mm +5.6 mm, -4 mm +2.8 mm and-2