These all-purpose magnetic separators purify free-flowing powders and granular material or concentrate and reclaim products in such materials. It also protects processing equipment such as grinders, crushers, rolls etc. against tramp iron damage. They can be installed inside closed chutes, at outlets of chutes and hoppers, or where materials discharge from feeders and conveyors. Its rugged construction is ideal for separating ferrous metal from material such as shredded cars, slag, crushed ore and ash at mass burn plants, in foundries recycling plastic, aluminuium and glass. Similar in operation, it has a nonmagnetic outside shell that is driven around an internal stationary magnet. Ferrous metal is magnetically drawn out of the material feed, held against the revolving shell, and released when it reaches a discharge point beyond the magnetic field.