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Dry processing options, involving the use of a circulating air classifier and thermal roasting (advanced microwave-assisted magnetizing roasting), followed by magnetic separation using an Induced Roll Magnetic Separator (IRMS), were evaluated for upgrading low-grade hematite-goethite iron ore fines. The novel magnetizing roast was conducted under reducing conditions using CO/CO 2  gas mixtures which converted the initial goethite-rich ore into a magnetite-rich ore. From a feed sample containing 54.5% Fe, 2.10% SiO 2 , 7.97% Al 2 O 3 , 0.97% TiO 2  and 0.13% P with a density of 3.87 g/cm 3  and 80 wt% passing 675 µm, a high-grade IRMS magnetic product of 62.0 wt% Fe was obtained with a yield of 71.6 wt% and around 82 wt% recovery of iron units.

Evaluation of Dry Processing Technologies for Treating Low Grade Lateritic Iron Ore Fines