A mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting .. A slightly inclined or horizontal rotating cylinder is partially filled with balls, usually stone or metal, which grind material to the necessary fineness by friction . Ball mills normally operate with an approximate ball charge of 30%.
The wear of mill liners affects the production performance of the mining mill. .. In Figure 3.5, the vertical dashed lines represent the scheduled stoppages and .. optimising the life and performance of worn liners in ball mills: experimental.