A novel technology for producing high-purity V2O5 from hazardous vanadium-containing solutions using precipitation and solvent extraction

Abstract

In this study, a novel and cleaner production process was developed to remove impurity anions by precipitation and purify vanadium by solvent extraction using an ionic liquid. After optimizing the precipitation process parameters and conducting an orthogonal test, most of the impurity anions were removed. Then, the extraction and stripping process parameters for recovering vanadium (V) in the filtrate were optimized, and the vanadium extraction and stripping efficiency reached more than 99.8% and 99.9%, respectively. The V2O5 product with a purity of over 99.8% was obtained. The extraction mechanism of vanadium (V) with the ionic liquid was investigated in-depth with the slope method and FT-IR analysis. Further, the essence of the extraction process was expounded at the molecular level with molecular electrostatic potential analysis.