Abstract: In order to realize the recovery and utilization of flotation tailings in Guanbaoshan，the MLA system was used to study the process mineralogy of samples. The results showed that the content of magnetite (hematite)，siderite and limonite in the sample are 23.27%，7.04% and 2.14% respectively， which are the main iron-bearing minerals，of which the iron distribution rates are 79.13%，14.12% and 5.91% respectively. The main gangue mineral is quartz with the content of 66.53%. The grain size distribu⁃ tion of the three iron minerals is very fine，and the grain size of gangue minerals is fine. The iron mineral and gangue mineral in the sample have a certain amount of monomer，but more of them are intergrowth， and the intergrowth relationship is close. The research results can be used as the basis for the comprehensive utilization of the iron tailings resources.

Key words: flotation tailings, process mineralogy, minerals composition, occurrence state, particle size distribution