Vanadium Distribution between Slag and Iron at Blow End Point and Its Phase Analysis

The vanadium extraction in combination blowing converter was simulated by 500 kg scale intermediate frequency induction furnace with top and bottom combinational blowing function,and the vanadium distribution(Lv) between iron and slag phase at blow end point was investigated. The compositions of vanadium-iron spinel were also analyzed by X-ray diffraction(XRD).The results show that vanadium distribution Lv between slag and iron at the blow end point is 1.8~2.8,which is related to the FeO content in slag.To ensure the quality of vanadium slag and decrease the FeO content with lower iron loss,the content of vanadium at the blow end point should be controlled at an appropriate high level. The formula of vanadium-iron spinel in vanadium slag was Fe O(Fe,V)₂O₃ indicating +3 for the valence of vanadium in slag phase.A small amount of V²⁺ species was evidenced to exist in the vanadium slag at the initial stage of blowing and gradually decreased with increase in oxygen supply.