The invention relates to a device and a method for reducing
hematite-containing materials by utilizing
microwave heat treatment and carrying out
magnetic separation. The device comprises a material bin, a screw feeder, a star type feeding
machine, a preheating reacting furnace and a
microwave magnetic separator. When the
magnetic separation is carried out, the materials are crushed and then added to the material bin, powdery materials enter the preheating reacting furnace through the screw feeder and the star type feeding
machine for preheating, and the preheated powdery materials enter the
microwave magnetic separator through an air inlet
pipe for the microwave heat treatment and the
magnetic separation; products subjected to the magnetic separation are discharged through an ore
discharge pipe from a
discharge port, and other materials are discharged through an outlet
pipe from the
discharge port. The device disclosed by the invention can be used for reducing the weak magnetic Fe2O3 contained in the materials into strong magnetic Fe3O4 through the microwave heating and separating the
iron ore concentrates through the magnetic separation, integrally and simultaneously carries out the reduction and the magnetic separation, has the advantages of small investment, low
energy consumption, large treatment quantity,
water saving, no
air pollution, wide application range and relatively popularization prospect, is simple in equipment, and can be used for treating multiple
hematite-containing materials which include ores, such as steel
slag, low-grade
limonite and iron ores.