Ball Mills Mineral Processing Metallurgy
In present day practice, ore is reduced to a size many times finer than can be obtained with crushers. ... rods, secondary ball mill with 25—40 mm(1″—1½") balls and possibly tertiary ball mill with 20 mm (¾") balls or cylpebs. ... The required mill net power P kW ( = ton/hX kWh/ton) is obtained from.