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2 6 1 Ball size distribution in tumbling mills 37 2 6 2 Milling performance of a ball size distribution 40 2 7 Summary 41 Chapter 3 Experimental equipment and programme 43 3 1 Laboratory grinding mill configuration 43 3 2 Preparation of mono size grinding media 44 3 3 Feed material preparation 46

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### Received February 1 2022 Accepted November 4 2022

Secondary ball mill balls experience significant levels of abrasive and corrosive wear with insignificant levels of impact wear due to the small 2 5 60 mm diameters They experience 25 40% less wear than in primary grinding of the same ore High chromium balls may be economical for high levels of corrosive wear preventing pitting as they experience 25 30% less wear than

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