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Korean Journal of Metals and Materials > Volume 55(10); 2017 > Article
Korean Journal of Metals and Materials 2017;55(10): 724-731. doi: https://doi.org/10.3365/KJMM.2017.55.10.724
Separation of Rhenium (VII) and Vanadium (V) from Hydrochloric Acid Solutions by Solvent Extraction
Thi Hong Nguyen, Hoai Thanh Truong, Man Seung Lee
Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University, Chonnam 58554, Republic of Korea
Correspondence  Man Seung Lee ,Tel: +82-61-450-2492, Email: mslee@mokpo.ac.kr
Received: 1 February 2017;  Accepted: 2 July 2017.  Published online: 28 September 2017.
ABSTRACT
The separation of Re(VII) and V(V) by solvent extraction with TBP was investigated by varying the HCl, metal and chloride ion concentrations. Re(VII) was selectively extracted over V(V) from the HCl solution. The highest separation between Re(VII) and V(V) occurred at a concentration of 2.0 M HCl. The extraction reaction of Re(VII) by TBP was verified using the slope analysis method. Changing the concentration ratio of the two metals and the chloride ion concentration had little effect on the extraction of V(V). Re(VII) could be completely stripped from the loaded TBP when the pH of the stripping solution was higher than 3.0. The obtained results can be utilized to develop a process for separating Re(VII) and V(V) from HCl solutions.
Keywords: separation, rhenium, vanadium, tributyl phospate, solvent extraction
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