China is rich in iron ore resources, but most of them are low-grade ores, including many hematite, limonite, siderite, etc., which are characterized by low iron grade, fine crystal size, compact distribution with gangue, and difficult dissociation of monomers. Therefore, it is difficult to use conventional beneficiation methods for separation and cannot be reasonably utilized. With the rapid development of iron and steel industry, there are fewer and fewer rich ores available for utilization. Therefore, it is of great significance to effectively develop and utilize low-grade iron ore and complex symbiotic ores.