High-performance rare-earth permanent magnets constitute the core of magnetic drums. Reasonable magnetic circuit arrangement generates high-density and uniform magnetic fields for continuous and efficient separation of ferrous impurities from bulk materials. Superior anti-demagnetization and high-temperature resistance maintain stable magnetic force during long-duration and high-load operation. With compact structure, large processing capacity and low maintenance requirements, magnetic drums are widely used in mineral processing, waste recycling, plastic and chemical material purification.