山西某低品位铁矿石选矿试验

为给山西某铁矿大规模开发利用矿区内的低铁含硫矿石提供技术方案，在完成矿石性质分析的基础上进行了选矿工艺研究。结果表明：①矿石中的铁以磁性铁和硅酸铁为主，分别占总铁的54.46%和36.52%，赤褐铁仅占总铁的2.81%，因此，该矿石宜采用弱磁选工艺回收，但铁回收率不高；②采用大块（-75 mm）中磁干抛-粉矿（-12 mm）弱磁干式预选-一段磨矿（-200目55%）-弱磁粗选-粗精矿二段磨矿（-200目95%）-2次弱磁精选-1粗1精脱硫反浮选流程处理铁品位为20.54%、硫含量为0.763%的铁矿石，获得了铁品位为69.65%、铁回收率为48.63%、硫含量为0.09%的铁精矿，硫品位为24.93%、硫回收率为27.77%的含硫杂质可作为硫精矿出售。

Beneficiation Process of a Low-grade Iron Ore in Shanxi Province

In order to provide a technical solution for large-scale development and utilization of a sulfur containing and low grade iron ore in Shanxi province,beneficiation process on the ore was conducted based on the property analysis of the ore.The results showed that:①Iron mainly exists as magnetite and siderite,accounting for 54.46% and 36.52% separately in the ore,limonite accounting for 2.81% in the ore.Therefore,the ore can be recovered through low intensity magnetic separation,but the iron recovery was lower.②Iron concentrate with 69.65% iron grade,48.63% iron recovery,sulfur content of 0.09%,and sulfur concentrate for sale with 24.93% sulfur grade,27.77% sulfur grade were achieved by deal with iron ore with iron grade of 20.54%,sulfur content of 0.763%,through dry magnetic separation with chunks(-75 mm)-low intensity dry magnetic pre-separation with iron ore fines(-12 mm)-one stage grinding(55% of -200 mesh)- low intensity magnetic rougher separation-two stage grinding process(95% of -200 mesh) of rough concentrate-two-stage low intensity magnetic separation-one roughing and one cleaning desulfurization reverse flotation.