Abstract: With the continuous development of China’s economy, the demand for iron ore resources is increasing. However, China’s high-grade iron ore resources are relatively small and increasingly depleted. This makes the development and utilization of low-grade weakly magnetic hematite and limonite in complex ores one of the current research hotspots. China’s iron ore resources are characterized by “poor, fine and mixed”, especially hematite and limonite. Because of their complex and variable composition, fine embedded particle size, easy to mud, etc., they are considered as typical difficult to select iron minerals. Therefore, how to efficiently recover iron minerals from these low-grade ores and improve the utilization rate of resources has become an urgent problem to be solved. The reelected iron crude concentrates from Yunxi Huangmao Mountain tailings contained 47.54% iron. Aiming at the difficulty of recovering the weak magnetic minerals in it, the chemical element composition, mineral composition, iron phase composition and grain size distribution of the iron crude concentrate are systematically studied by X-ray diffraction, particle size and metal distribution, chemical multi-element and other research and analytical methods. The results show that iron is mainly concentrated in limonite and hematite, with distribution rates of 49.05% and 43.56% respectively, and is closely symbiotic with silicate veins such as tremolite and diorite. A combined process of graded grinding （−0.074 mm 80%）-cationic reverse flotation is used in the re-election test. Under the condition of sodium carbonate 400 g/t, dodecylamine 250 g/t, Y-2 150 g/t, DF inhibitor 600 g/t. The iron ore concentrate with 51.51% iron grade, 86.76% recovery and 43.51% SiO₂ removal rate is obtained. It provides reliable technical support for the efficient utilization of similar difficult-to-select iron ore resources.