| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 211920 | Hydrometallurgy | 2015 | 5 Pages |
•Electric field was used to strengthen the oxidation process of low-valent vanadium.•The mechanism of electro-oxidation hydrometallurgical leaching process was explored.•The optimal conditions for vanadium extraction were determined.•The leaching rate of vanadium reached 93.67% under the optimum conditions.
Low-valent vanadium in the insufficient oxidation roasting process of sodium salt reduces vanadium leaching yield. Therefore, the electro-oxidation leaching method was investigated to strengthen the oxidation process of low-valent vanadium. The mechanism of the electro-oxidation hydrometallurgical leaching process was examined along with the electrochemical performance of the reaction system through X-ray diffraction, scanning electron microscopy, ultraviolet, and ultraviolet–visible diffuse reflectance spectroscopy. Results showed that low-valent vanadium can be oxidized effectively under an electric field in the leaching process. The leaching yield of vanadium reached 93.67% under the optimum conditions, including a current density of 1000 A/m2, a liquid-to-solid ratio of 4:1 ml/g, a temperature of 80 °C, and a leaching time of 40 min. This percentage is 3.73% higher than that attained under the same conditions without an electric field. Meanwhile, the vanadium content in slag decreased from 7.15% to 0.98%.
