Journal
HYDROMETALLURGY
Volume 166, Issue -, Pages 87-93Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.hydromet.2016.09.003
Keywords
Vanadium; Synergistic extraction; Stripping; Sulfuric acid
Categories
Funding
- National Natural Science Foundation of China [U1202274, 51504059]
- National Science and Technology Support Program [2012BAE01B02]
- Fundamental Research Funds for the Central Universities [N100302005]
- Doctoral Fund Project [20120042110011]
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In the present study, the mechanisms and thermodynamics of vanadium extraction by a mixture of bis-2-ethylhexyl phosphorous acid (D2EHPA) and 2-ethylhexyl phosphorous acid mono-2-ethylhexyl ester (EHEHPA) from sulfate medium were investigated. It was found that the maximum synergistic factors obtained at X-D2EHPA = 0.2 and the reaction of the synergistic extraction is exothermical. Results showed that the mixture system in the presence of complexing agents exhibit a higher extraction efficiency and require a lower acid consumption during the stripping process-of vanadium. Fourier transform infrared (FT-IR) spectroscopy showed that P-O-H and P=0 of the extractants are responsible for the synergistic extraction of VO2+ species by cation exchange mechanism and some hydrogen bonds between EHEHPA and D2EHPA formed in the synergistic extraction system. With the slope analysis method, the reaction of the synergistic extraction was mainly predicted. (C) 2016 Published by Elsevier B.V.
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