三产品磁选柱的研制与应用

针对辽宁朝阳某选矿厂磁铁矿选别流程复杂的问题，根据磁铁矿不同组分的磁性和密度差异，研制了一种三产品磁选柱，设计了磁场结构和流场结构，分别用于磁铁矿单体、富连生体和贫连生体(脉石)的分离。磁系由恒定磁场、粗选磁场和精选磁场3部分组成。采用三产品磁选柱对辽宁朝阳某选矿厂细度为-0074 mm占6458%、TFe品位为6143%的磁铁矿样进行选别，当恒定磁场励磁电流6 A、粗选磁场励磁电流6 A、粗选周期1 s、粗选区上升水流速度39 cm/s、精选磁场励磁电流08 A、精选周期25 s、精选区上升水流速度096 cm/s时，精矿、中矿、尾矿TFe品位分别为6793%、5467%、2152%，TFe回收率分别为9290%、571%和139%。与选矿厂原分选指标相比，三产品磁选柱在达到了该选矿厂两段选别分选指标基础上，使最终铁精矿TFe品位提升了057个百分点，有效缩短了选别流程。三产品磁选柱在一定程度上实现了磁铁矿单体、连生体和脉石矿物的同步分离，能够有效提高磁铁矿的分选效率，为磁铁矿石的高效分选提供新的技术途径。

Development and Application of Magnetic Separation Column for Three Products

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