Abstract: 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.

Key words: Iron ore tailings, Process mineralogy, Pre-concentration, Deep reduction