Abstract: The dissemination sizes of different minerals in sulfur-bearing low-grade iron ore with high content of silicon in Shandong is greatly different. The content of magnetite is the same to that of hematite (limonite). Hematite (limonite) is closely disseminated with quartz. This kind of ore is hard to treat. The test shows that it is efficient to treat this kind of ore by the flow sheet of grinding-flotation to remove sulfur-low-intensity magnetic separation-regrinding of tailings from low-intensity magnetic separation-high-intensity magnetic separation-reverse flotation of concentrate from high-intensity magnetic separation to remove silicon.The final iron concentrate contains 65.26%Fe，0.18% S，5.41% SiO₂ with a recovery of 82.99%，and the sulfur concentrate contains 25.56% S with a recovery of 68.89%.

Key words: Sulfur-bearing low-grade iron ore with high content of silicon, Dissemination size, Flotation to remove sulfur, Reverse flotation to remove silicon