Abstract: In order to reduce the flotation tailings grade of a dressing plant of magnetite, experimental researches on the new magnetic flotation with silicon removal were carried out. The results showed that comparing with the conventional inverse flotation process of one-roughing and two-scavenging with cyclone-static microbubble flotation column, the process of one-roughing and one-scavenging after the flotation column was added with an additional pulsed magnetic field shortened the flotation time of 30%, reduced the tailings grade by 6.35 percent, and increased the recovery by 0.95 percent under the similar circumstances of raw ore’s nature and concentrate grade before the flotation. The application of magnetic flotation method in reverse flotation of magnetite opens up a new approach for the separation of magnetite in China. 

Key words: Magnetite, Magnetic aggregation, Pulsed magnetic field, Cyclone-static microbubble flotation column