Abstract: Aiming at the problems of complexity of magnetite separation process in a concentrator in Chaoyang,Liaoning Province,a threeproduct magnetic separation column was developed based on the magnetic and density differences of different components of magnetite.The magnetic field structure and flow field structure are designed for the separation of magnetite monomer,rich aggregate and poor aggregate (gangue) respectively.The magnetic system is composed of three parts:constant magnetic field,coarse magnetic field and fine magnetic field.Threeproduct magnetic separation column was used to separate magnetite samples with fineness of -0074 mm of 6458% and TFe grade of 6143% in Chaoyang area of Liaoning Province.With a constant magnetic field excitation current of 6 A,a magnetic field excitation current of rough separation section of 6 A，a rough selection cycle of 1 s，an upflow velocity of coarse separation section of 39 cm/s，a magnetic field excitation current of clean concentration section of 08 A,a clean concentration cycle of 25 s，and an upflow velocity of clean concentration section area of 096 cm/s，a concentrate,a middling and a tailing were generated with TFe grades of 6793%,5467% and 2152%，correspondingly with recovery rate of 9290%，571% and 139%.Compared with the original separation indexes of the concentrator,he separation process can be shortened，and TFe grade of final iron concentrate can be increased by 057 percentage points.The threeproduct magnetic separation column can realize the separation of magnetite clean particles,intergrowths and gangues,improving the separation efficiency and providing a new technical approach for the efficient enrichment of magnetite ore

Key words: magnetic separation column of three products,magnetite,constant magnetic field,coarse magnetic field,fine magnetic field