Abstract: Iron ore resources in China are increasingly characterized by low grade,fine dissemination,and complex composition,
making the efficient processing of fine-grained lean magnetite a critical challenge in mineral processing. This paper
aims to systematically review the resource characteristics,processing difficulties,and technological advancements for this type of
ore. It begins by outlining the resource overview and the impact of its basic characteristics on separation. Subsequently,by synthesizing
recent research,the paper focuses on analyzing the current status and application effectiveness of three core technologies.
① Novel comminution technologies (High-Pressure Grinding Rolls and Tower Mills),which enhance mineral liberation
and adhere to the principle of "more crushing and less grinding," optimizing separation indices while saving energy;② Magnetic-
gravity combined force field separation equipment (exemplified by magnetic separation columns),which effectively improves
concentrate quality and shows potential in coarsening the grinding fineness to reduce energy consumption;③ Low-intensity
magnetic separation-reverse flotation technology,which efficiently disrupts magnetic entrainment,achieving iron upgrade
and silica reduction while decreasing the required grinding stages. The conclusion indicates that the integrated application of
these technologies provides an effective pathway for the efficient processing of fine-grained lean magnetite. Finally,future development
directions for related technologies are discussed.