Effect of iron compositions on reduction kinetics of manganese oxide in CaO-SiO2-MgO(sat.)-FeO-MnO slag

摘要

In order to improve manganese yield by smeltingreduction of manganese ore in less slag blowing at BOF, thereduction kinetics of manganese oxide in CaO-SiO2-MgOsat.-FeO-MnO slag was investigated under experimental scale. Theoptimum initial carbon content in metal to the reduction of MnOis about 1.9%. The existence of Si in metal can accelerate thereduction of MnO in slag, and the initial Mn content has noinfluence on the reduction rate. From the assumption that thereduction of (MnO) is controlled by the equilibrium manganesedistribution and mass transfer through the metal and slag boundarylayers at the metal/slag interface, the rate equation was obtained.The kinetic model suggested in the present study showed goodagreement between calculated and observed values of [Mn] and thereduction behaviour of (MnO) in slag can be described by the present model.