A ball mill is a device that uses steel balls or other grinding media to grind materials in a rotating cylinder. Steel balls effectively grind materials through impact and friction, which directly affects the grinding efficiency and the fineness and uniformity of the product, and is crucial. High-quality steel balls can significantly improve the grinding effect while optimizing product quality. Ball mills are suitable for fine grinding and mixing of materials and are widely used in mining, building materials, chemicals and other industries. Semi-autogenous mills combine the characteristics of autogenous ball mills and are usually used for primary crushing and grinding of ores, especially in large-scale mines and beneficiation plants with high processing capacity and low energy consumption. Common lining materials include high manganese steel, alloy steel and bimetallic, which are used to protect equipment and improve grinding efficiency.