Abstract: In order to explore the effect of magnetization treatment on the foam properties of hematite in reverse flotation process，water，starch，dodecylamine and pulp were magnetized respectively. The changes of total volume of three-phase foam，foam water recovery，half-life，foam layer height，bubble density and foam film wall thickness under different magnetization modes were systematically measured， and the mechanism of magnetization treatment in hematite reverse flotation was deeply analyzed. The re‐ sults show that the optimal magnetic induction intensity of magnetized water and magnetized dodecylamine is 150 mT and 100 mT，respectively. At the optimum strength，the foam volume，foam water recovery rate，three-phase foam half-life of hematite and quartz，bubble density and foam film wall thickness were significantly improved by magnetization treatment. Magnetized starch has little effect on foam properties. The magnetized slurry only has a significant effect on the thickness of the foam film wall and the foam half�life，and is negatively correlated with the magnetic induction intensity，and the change tends to be gentle at 400 mT. The mechanism of magnetization treatment may be related to the influence of magnetic field on the hydrogen bond structure and ion polarization behavior of the solution.

Key words: hematite, quartz, bubble, magnetization treatment, dodecylamine, starch