Abstract
Fully oxidation roasting of vanadium slag are industrial methods to recover V(V) from vanadium slag, and discharges residue and wastewater containing highly toxic V(V) and Cr(VI). To avoid this, an environmentally friendly strategy for the direct recovery of low valence vanadium (LVV) from vanadium slag produced by selective oxidation roasting and self-pressure leaching was proposed, and the leaching process of the selective oxidation roasted slag was investigated in this study. It was found LVV recovery to be 68.38% in atmospheric leaching, and the structure of the vanadium slag particles was not completely broken down during the roasting process. In addition, the solubility of the newly formed vanadium compounds was low. When enhanced the leaching process by employing high-temperature self-pressure leaching conditions, 98.34% of the vanadium was recovered as VO2+ ion in solution accounting for 100%. In addition, silicon and titanium were enriched in the leaching residue, realizing the effective separation of vanadium and titanium in the leaching stage. Finally, the VOSO4 electrolyte will be obtained with sufficient purity for use in batteries via solvent extraction. This process provides a novel approach for the comprehensive utilization of vanadium slag that directly recovers VOSO4-containing leaching solution from slag rather than oxidizing V(III) to V(V) then reduces to LVV.
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