Study on Reduction Mechanism of Vanadium Oxides in Lumpy Zone of Chengde Steel's Blast Furnace

It is of great significance to investigate the behaviors of vanadium in the blast furnace(BF)with V-Ti magnetite as main raw materials.The reduction mechanism of vanadium in the lumpy zone of BF was explored by theoretical analysis and simulation experiments.It is indicated by the thermodynamic calculations that V and Fe can infinitely dissolve in each other,and the thermodynamic conditions for the reduction of vanadium oxides will be greatly improved with appearance of the iron phase.It is also confirmed by XPS and XRD that the valence state of V is +5 in the V-Ti sinter of Chengde Steel which mainly consists of titanic magnetite and titanium hematite with V and Ti dissolved in titanic magnetite.Through the reduction experiments for the V₂O₃ pure reagent,mixed reagent of Fe₂O₃ and V₂O₃(1:1)and V-Ti sinter of Chengde Steel,it is shown that V₂O₃ pure reagent cannot be restored by CO within 1000℃,and elemental V cannot be obtained from vanadium oxides by indirect reduction of BF lumpy zone.