The magnetic drum (also known as a permanent magnetic drum or magnetic pulley) is a drum-type separator with built-in high-performance permanent magnets. It can directly replace the driven pulley of a conveyor belt and is suitable for continuous processing of dry powders and granular materials. With ferrous removal efficiency ≥98%, it is widely used in mining, building materials, plastics, lithium battery, and food industries to remove ferrous contaminants, protect downstream crushing and grinding equipment, and improve product purity.