Abstract
In this research, ilmenite concentrate of Iran region successfully was smelted by Electro-Slag Crucible Melting (ESCM) process to produce TiO 2-rich slag as primary product and pig iron as by-product. Moreover, effects of reductant (carbon) amount and smelting time on TiO 2 and FeO content of slag and iron recovery were studied. It is found that addition of carbon excess to stoichiometric amount decreases the iron recovery and TiO 2 content in slag. If the smelting time keeps between 0 to 17 min, the TiO 2 content and iron recovery will be increased, whereas smelting time in excess of 17 min will cause products decline significantly. At optimum conditions, TiO 2 content in slag and the iron recovery are 70 wt.% and 84%, respectively. Kinetic studies proved that the reduction of equivalent FeO was first-order reaction. The studies made by X-ray diffraction analysis showed that formation of the titanium sub-oxides (Ti 3O 5 and Ti 2O 3) causes the decrease in iron recovery and TiO 2 content.
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