Magnetic Pulley operates as head pulleys on belt conveyors. These low-cost, self cleaning magnets remove tramp iron and purify materials conveyed on bulk forms. When material carried on a conveyor enters the magnetic field surrounding a Magnetic Pulley, pieces of ferrous metal in the material are attracted to the belt. They are held magnetically against the belt until carried to the underside of the pulley, where the belt takes them away from the magnetic field to be discharged. Non-magnetic material falls away from the pulley in a normal trajectory. Separations is automatic and continuous. These are used to protect processing machinery from damaging tramp metal, eliminate ferrous contaminants from product, concentrate magnetic minerals in mining ores, and remove steel from recyclabel. In many applications, it's possible to replace an existing head pulley with a magnetic pulley, on a size-for-size basis.