新疆某低品位细粒磁铁矿选矿工艺研究

为给新疆某低品位细粒磁铁矿的开发利用提供合理的选矿工艺，针对矿石性质的特点，进行了阶段磨矿、阶段弱磁选工艺和阶段磨矿、阶段弱磁选、阳离子反浮选工艺试验。结果表明：①采用3段磨矿、4次弱磁选的阶段磨选工艺流程处理该矿石，在三段磨矿细度为-0.038 mm占95.18%的情况下，可获得铁品位为66.48%、铁回收率为78.79%的铁精矿；采用2阶段磨矿弱磁选、弱磁精矿2阳离子反浮选、反浮选尾矿再磨-弱磁选抛尾后再返回反浮选的流程处理该矿石，在反浮选尾矿再磨细度为-0.038 mm 占96.34%的情况下，可获得铁品位为69.76%、铁回收率为78.51%的铁精矿。②单一弱磁选流程虽然简洁，但弱磁选、阳离子反浮选联合流程在最后一段磨矿量（相对原矿）显著下降22.99个百分点的情况下，最终精矿铁品位却大幅提高3.28个百分点。

Beneficiation Process of a Fine Low-grade Magnetite from Xinjiang

The process of stage grinding，stage low intensity magnetic separation process and stage grinding，stage low intensity magnetic separation，cationic reverse flotation process was conducted in order to provide a reasonable beneficiation process for development and utilization of a fine low-grade magnetite ore from Xinjiang.The results showed that ①Iron concentrate with iron grade of 66.48% and recovery of 78.79% was obtained by adopting the process of stage grinding-stage low intensity magnetic separation process of three stage grinding and four stage low intensity magnetic separation at the third stage grinding fineness of 95.18% passing 0.038 mm; Iron concentrate with iron grade of 69.76% and recovery of 78.51% was achieved by adopting the process of two stage grinding，stage low intensity magnetic separation，cationic reverse flotation for the magnetic concentrate 2，regrinding for reverse flotation tailings，low intensity magnetic separation concentrate returned into the reverse rough flotation at the regrinding fineness of 96.34% passing 0.038 mm for reverse flotation tailings.② Even though single low intensity magnetic separation process is simple，the iron grade of final concentrate can be improved significantly by 3.28% under the condition of the last stage grinding capacity decreased by 22.99% through combined process of low intensity magnetic separation and cationic reverse flotation.