Abstract: Taking limonite of Henan Yima as reducing agent, the experiments of microwave magnetic roasting & low magnetic separation of a certain limonite ore from Indonesia was carried out, by which the influences of microwave heating time, grinding time and magnetic field intensity were studied respectively. The results show that under the fixed conditions of microwave power of 1 kW when the roasting for 45 min (the final temperature at 840 ℃), grinding fineness of 97.17% ~200 mesh (-325 mesh of 82.03%, -400 mesh of 64.15%) for roasted ores, and the magnetic field strength of 150 kA/m with addition of 5.4% the reducing agent, Fe concentrate with Fe grade of 57.28% and Fe recovery of 83.95% were obtained. It is found during the experiments that the products after microwave heating and roasting can easily be ground very fine.

Key words: Limonite, Microwave heating, Magnetic roasting, Low intensity magnetic separation