Efficient tailing discarding magnetic pulley device used after magnetic iron ore fine crushing

The utility model discloses an efficient tailing discarding magnetic pulley device after magnetic iron ore fine crushing, which comprises a rack, a magnetic roller and a turnabout roller which are connected through a conveying belt are respectively arranged at the front end and the rear end of the rack, a feeding area is arranged above the middle of the conveying belt, an ore separation device is arranged on the rack below the front side of the magnetic roller, and a magnetic material is arranged on the inner side of the magnetic roller. The magnetic material is divided into a pre-separation area, a separation area and an ore unloading area, wherein the side faces of the pre-separation area, the separation area and the ore unloading area are sector-shaped, and the magnetic wrap angles of the pre-separation area, the separation area and the ore unloading area are 35-37 degrees, 74-77 degrees and 16-19 degrees respectively. The magnetic iron ore pre-separation device is mainly used for pre-separation of fine ma