Roasting reduction-magnetic separation technology of Xuaniong-type iron ore and its relevant influencing factors

Coal-based roasting reduction-magnetic separation technology for iron extraction from Xuanlong-type iron ores and its relevant influencing factors were investigated. An optimal technological condition for iron extraction from the iron ores was determined with iron concentrate grade and iron recovery rate as evaluation indices. The results show that the iron concentrate grade of 92.53% and the iron recovery rate of 90. 78% can be obtained when the reductant dosage is 30%, the roasting temperature is 1 200℃, the reduction time is 60 min, the percentage of roasting products with a grinding fineness of -45 μm is 96. 19%, and the magnetic field intensity is 111 kA·m^-1.