## ball mill efficiency calculations

26 Effect of ball mixture 37 261 Ball size distribution in tumbling mills 37 262 Milling performance of a ball size distribution 40 27 Summary 41 Chapter 3 Experimental equipment and programme 43 31 Laboratory grinding mill configuration 43 32 Preparation of monosize grinding media 44 33 Feed material preparation 46 75 100 mm diameters Ball mill balls experience a greater number of impacts but at lower magnitude than SAG mill balls due to the smaller ball size and smaller mill diameter Feeds are typically highly abrasive contributing 10 15 mhr wear for softer ores and 20 mhr for abrasive gold copper had decreased for the 2 mm 14 mm monosize feed compared to the bigger 4 mm 28 mm monosize feed This therefore shows that should the material feed size continue to decrease the smaller balls will perform better than the larger balls during milling as was mentioned by Katubilwa et al Effect of ball diameter size on mill power draw

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