Abstract
This paper focused on the leaching process of vanadium from vanadium-chromium reducing residue in alkaline medium with MnO2. The effects of serval parameters like reaction time, reaction temperature, dosage of MnO2, dosage of NaOH, and liquid-to-solid ratioon the leaching process had been studied. The results indicated that MnO2 was an efficient oxidant for vanadium leaching out. The leaching efficiency of vanadium was up to 97.25% at reaction temperature of 90 °C, reaction time of 60 min, dosage of MnO2 at 50 wt.%, concentration of NaOH at 30 wt.% and liquid-to-solid at 5:1 mL/g.
Highlights
The vanadium compounds as important national strategy resources were widely used in petrochemical industry, catalyst, iron steel, due to its excellent physicochemical properties and it was called as “vitamins of modern industry” [1,2,3,4,5,6]
The vanadium existed as low valent in vanadium-chromium reducing residue according to the results showed in Figure 1, and it was hard to leach out in alkaline medium [10]
It was known that E0MnO2/Mn2+ =1.21 V and E0(VO2+/VO2+) =1.00V, and MnO2 might be used as the oxidizing agent to oxidize V(IV) in the leaching process [19, 20]
Summary
The vanadium compounds as important national strategy resources were widely used in petrochemical industry, catalyst, iron steel, due to its excellent physicochemical properties and it was called as “vitamins of modern industry” [1,2,3,4,5,6]. As it had an electronic configuration of [Ar]3d34s2, the vanadium valence could be V(II), V(III), V(IV) and V(V) the most common oxidation states [7]. The handling of these residues had become a thorny problem in many plants in China
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