NAVIGATION
Chagnes, Alexandre, et al. Hydrometallurgy, 2010, 104(1), 20-24.
Vanadium(V) extraction from acidic sulfate media was achieved using protonated trioctylamine in n-dodecane modified with 5% (wt) 1-tridecanol.
Experimental procedures and results
· The work examined the speciation of vanadium (V) extracted from acidic sulfate media using protonated trioctylamine in n-dodecane modified with 5% (wt) 1-tridecanol, through Fourier transform infrared spectroscopy (FTIR) and 51V nuclear resonance spectroscopy (51V NMR).
· In solutions containing 0.02-0.1 mol/kg vanadium (V) in 0.2-1 mol/kg HClO4, the presence of VO2+ was detected by 51V NMR. In similar acidic conditions but in H2SO4 media, speciation calculations suggest the coexistence of VO2+ and VO2SO4- in the aqueous phase, despite the observation of a unique 51V NMR signal at -545 ppm similar to the HClO4 solution, along with a vibration band at 998 cm-1.
· The FTIR spectra of 0.2 mol/kg protonated trioctylamine in n-dodecane modified with 5% (wt) 1-tridecanol, loaded with varying concentrations of vanadium (V) extracted from 1 mol/kg H2SO4, indicate the presence of vanadium (V) in organic phases as likely polyvanadates, such as decavanadates. The 51V NMR did not confirm or rule out this finding, as the micellar structure of the organic phases affects the chemical shift of the extracted species.
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