| Abstract Scope |
The dissolution behavior of vanadium and iron from their oxide compounds (V2O5, FeO, Fe3O4 and Fe2O3) in D2EHPA was explored as a new approach for metal processing. The dissolution was conducted using single and mixed oxides, and performed without or with the addition of water. Vanadium was dissolved when only D2EHPA was used, and the addition of water could enhance the dissolution yields and kinetics. Meanwhile, water needed to be added to dissolve the iron. A dissolution mechanism was proposed. Afterwards, V- and Fe-loaded D2EHPA solutions were prepared to examine the stripping behavior. The stripping agents employed consist of H2SO4, HCl, H2O2 and oxalic acid solutions. The effect of stripping solution concentrations, V/Fe concentration ratio, organic/aqueous (O/A) phase ratio and mixing time was examined. Thermodynamics and mechanisms for each stripping solution, focusing primarily on vanadium, were investigated. The results were supported by using analysis techniques, such as FTIR and UV-Vis. |