Separation of rhenium(VII), molybdenum(VI), and vanadium(V) from hydrochloric acid solution by solvent extraction with TBP

Abstract

To investigate the separation of Re(VII), Mo(VI), and V(V) from hydrochloric acid solution, solvent extraction with TBP was investigated. When HCl concentration was lower than 3 M, TBP could selectively extract both Re(VII) and Mo(VI), leaving V(V) in the raffinate. The extraction percentage of Re(VII) was much higher than that of Mo(VI) in 1 M HCl, while that of the two metals was similar at 2 M HCl solution. Since there was not much difference in the stripping percentage of Re(VII) and Mo(VI) from the loaded TBP using HCl, NaOH, and NH4OH solutions, it was difficult to separate the two metals by stripping. Our results indicated that it is possible to separate the three metals by solvent extraction with TBP from 1 M HCl solution.