An iron ore in northwest China contains Tfe grade of 35. 72% and P 0. 77% , and magnetite constitutes 86. 62% of the iron ores that disseminates in the form of micro-fine particles. The experiments were carried out by feeding particle of wet pre-concentration for discarding the tailings,stage grinding-low intensity magnetic separation and reverse flotation for degrading phosphorus in concentrations of low intensity magnetic separation. The results show that wet pre-concentration for discarding the tailings can increase the grade of feed and decrease the dosage for grinding remarkably. The eligible iron concentrates with reasonable grade of Fe and P can not obtained by the process of two-stage grinding-low intensity magnetic separation. Through the dephosphorization reverse flotation process of one-stage roughing, one-stage cleaning and three-stage scavenging for iron concentrate of the low intensity magnetic separation, the finally iron concentrate of Fe grading at 64. 78% and P at 0. 139% with Fe recovery of 68. 01% was achieved.%西北某高磷磁铁矿矿石铁品位为35.72％、磷含量为0.77％,铁矿物中磁铁矿占有率为86.62％,嵌布粒度微细.对该矿石进行了湿式预选抛废粒度研究、阶段磨矿—阶段弱磁选和弱磁精反浮选脱硅试验研究.结果表明:湿式预选抛废可以显著提高入磨矿石品位、减少入磨量,采用2段磨矿、2段弱磁选不能获得铁品位和磷含量合格的铁精矿,弱磁精经1粗1精3扫反浮选脱磷,最终可获得铁品位为64.78％,铁回收率为68.01％,磷含量为0.139％的铁精矿.
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