Ball Mills Mineral Processing Metallurgy13/02/2017· Ball Rod Mills based on 4″ liners and capacity varying as power of mill diameter on the 5′ size give 20 per cent increased capacity on the 4′ size 25 per cent and on the 3′ size 28 per cent This fact should be carefully kept in mind when determining the capacity of a Steel Head Ball Rod Mill as this unit can carry a greater ball or rod charge and has potentially higher