Preparation of vanadium electrolyte from vanadium shale leaching solution with high concentration chloride using D2EHPA
(1. College of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;
2. State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China;
3. Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan University of Science and Technology, Wuhan 430081, China;
4. Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource, Wuhan University of Science and Technology, Wuhan 430081, China)
2. State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China;
3. Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan University of Science and Technology, Wuhan 430081, China;
4. Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource, Wuhan University of Science and Technology, Wuhan 430081, China)
Abstract: A process for preparing vanadium electrolyte accompanied by the recovery of valuable elements from vanadium shale was proposed. The results showed that under the optimal extraction conditions of the feed solution at a pH of 2.6, D2EHPA concentration of 20%, phase ratio (O/A) of 1:1, extraction time of 8 min, H2SO4 concentration of 4 mol/L, and stripping time of 30 min, the vanadium extraction rate was 99.3% and the vanadium stripping rate was 99.8%. The composition and electrochemical performance of the electrolyte were studied in detail. The solution chemical and FTIR analysis showed that chloride ions in the leaching solution formed complexes with vanadium ions, promoting vanadium extraction. The proposed method in this study realized the comprehensive utilization of vanadium shale and prevented toxic environmental pollution in the preparation process of vanadium electrolyte.
Key words: vanadium shale; solvent extraction; vanadium electrolyte; electrochemical performance