Study on the Kinetics of Extracting Vanadium and Iron from Sulfuric Acid Solution with P507
Vanadium is usually associated with other metals as a rare metal.A large number of impurity ions,such as iron,could exist in the sulfuric acid leaching solution of vanadium-bearing ore,which signifi-cantly impacts the subsequent separation and enrichment of vanadium.The study of extraction kinetics is an important method for determining the control steps in the extraction process,and the difficulty in ex-tracting metal ions.A self-designed cylindrical constant interface cell was used to study the kinetics of ex-tracting V(Ⅳ)and Fe(Ⅱ)from sulfuric acid solution with P507 as the extractant.The results show that the aqueous phase serves as the diffusion resistance zone of the extraction process,which is a chemical reac-tion-controlled type.The extraction rates of V(Ⅳ)and Fe(Ⅱ)both demonstrate an upward trend with the increase of stirring speed and extraction temperature.The apparent activation energy of V(Ⅳ)extrac-tion is 48.68 kJ/mol,and that of Fe(Ⅱ)extraction is 135.11 kJ/mol.P507 is more likely to extract V(Ⅳ)from sulfuric acid solution,presenting the potential to achieve the efficient separation of V(Ⅳ)from Fe(Ⅱ).
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