Research Progress of Solvent Extraction for Separation of Vanadium and Chromium

Vanadium and chromium have the similar chemical properties and naturally coexist at most occasions,so the problem for separation of vanadium and chromium has not been properly solved for a long time.The solvent extraction is currently the most common method for the separation of vanadium and chromium. Traditional extraction systems for vanadium-chromium separation,including neutral complexation extraction system,ion association extraction system,acidic complexation and chelation extraction system,synergistic extraction system,were introduced.Three-liquid phase extraction system was used as an example for introducing a novel extraction system. Furthermore,the advantages and disadvantages of each extraction system were analyzed. Three-liquid phase extraction system is expected to have a broad prospect due to a high separation factor,well physical phenomena,short process flow,simple operation,low cost and flexible ratio of extractant,considering the environment protection and company benefits.