齐大山铁尾矿工艺矿物学研究

齐大山铁尾矿的提铁研究是国家高技术研究发展计划（863计划）铁尾矿高效提铁技术研究子项的一部分。为圆满完成深度还原给料铁品位≥30%、铁回收率≥80%，还原铁粉铁品位≥90%的任务目标，对齐大山铁尾矿开展了工艺矿物学研究。结果表明：试样中的铁矿物主要以贫连生体的形式存在，且在-0.038 mm粒级有明显的富集现象，主要铁矿物为赤褐铁矿和硅酸铁，磁铁矿次之，这些铁矿物粒度微细，平均粒度分别为0.022、0.009、0.011 mm，单体解离度分别为61.78%、42.86%、45.64%，铁矿物与脉石矿物共生关系密切；基于上述工艺矿物学特征，推荐了磨矿-弱磁选-强磁选的预富集工艺流程。

Process Mineralogy Research on Iron Tailings from Qidashan

Technology Beijing，Beijing 100083，China；2.Key Laboratory of High-Efficient Mining and Safety of Metal Mines，Ministry of Education，Beijing 100083，China Iron extracting from Qidashan iron ore tailings is a subproject of State High-technology Research and Development Program (863 Program)，to efficiently concentrate iron from iron ore tailings.Mineralogy technology research on Qidashan iron ore tailings was carried out in order to make deep reduction raw materials of iron grade higher than 30%，iron powder of iron recovery higher than 80% and iron grade over 90%.The results showed that iron concentrated obviously at grain sizes of -0.038 mm，and the main iron minerals are hematite-limonite，siderite and followed by magnetite.Those minerals are extremely fine disseminated with average particle sizes of 0.022，0.009，0.011 mm and liberation degree of 61.78%，42.86%，45.64% respectively.Iron minerals are closely associated with gangues.The pre-concentration process of grinding-low intensity magnetic separation-high intensity magnetic separation was recommended，based on the process mineralogy of the iron ore tailings above.