1, using new high-energy product (42MGOe above) rare earth permanent magnet material, the axial string denounced extreme right magnetic system structure, with high magnetic field strength (1.3-1.8T), high magnetic field gradient (104), and high specific magnetic. 2, high-intensity ultra-thin transmission, sorting tape. 3, using a new type of axial string denounced extreme right magnetic system structure, magnetic roller surface magnetic induction 1.2-1.8T, and electromagnetic induction-type magnetic roller roller is 3-4 times higher than the magnetic field gradient, reaching 104, higher than the magnetic 2 -3 times. 4, no air gap, material non-blocking, sorting and high efficiency. 5, selected for grain size up to 50mm. 6, magnetic roller by the conveyor belt protection, no wear, easy to demagnetization. 7, installation, maintenance and production of low operation cost, easy to use.