西北某高磷磁铁矿选矿试验研究

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。

Study on Beneficiation Test of a High Phosphorus Magnetite in Northwest China

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.