Electrochemical separation of zirconium from hafnium using chloraluminate melts
Journal Article
·
· Inorg. Chem.; (United States)
This paper reports on the electroreduction of Hf(IV) in chloraluminate melts of similar compositions and on the electrochemical separation of zirconium from hafnium using low-melting chloraluminate melts. Results indicated that the addition of HfCl/sub 4/ to AlCl/sub 3/-NaCl melts (ranging in composition from 50.3 to 52 mol % AlCl/sub 3/) resulted in a poorly defined voltammetric reduction wave that occurs at potentials somewhat more negative than the reduction of Al/sub 2/Cl/sub 7//sup -/. The cyclic voltammograms exhibit either one or two reoxidation peaks depending on the switching potential, concentration of Hf(IV), and melt acidity. The reoxidation peak at more negative potentials (approx.+0.1V with respect to an Al(III)/Al reference electrode in the melt of the same composition) is observed when the Hf(IV) concentration is small compared to that of Al/sub 2/Cl/sub 7//sup -/. The reoxidation peak at more positive potentials (/sub 0/.2V with respect to the same reference electrode) increases with the Hf(IV) concentration.
- Research Organization:
- Univ. of Tennessee, Knoxville
- OSTI ID:
- 6131953
- Journal Information:
- Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 21:9; ISSN INOCA
- Country of Publication:
- United States
- Language:
- English
Similar Records
The Lewis acidity of room temperature chloroaluminate molten salts buffered with sodium chloride
Vapor pressure of ZrCl{sub 4} and HfCl{sub 4} over melt systems KCl + AlCl{sub 3} (1:1.04 mol) + ZrCl{sub 4} and KCl + AlCl{sub 3} (1:1.04 mol) + HfCl{sub 4}
Electroreduction of hafnium complexes in mixed chloride-fluoride melts lacking a large excess of fluoride ions
Journal Article
·
Sun Oct 31 23:00:00 EST 1993
· Journal of the Electrochemical Society; (United States)
·
OSTI ID:5696239
Vapor pressure of ZrCl{sub 4} and HfCl{sub 4} over melt systems KCl + AlCl{sub 3} (1:1.04 mol) + ZrCl{sub 4} and KCl + AlCl{sub 3} (1:1.04 mol) + HfCl{sub 4}
Journal Article
·
Sat Jul 01 00:00:00 EDT 1995
· Journal of Chemical and Engineering Data
·
OSTI ID:94341
Electroreduction of hafnium complexes in mixed chloride-fluoride melts lacking a large excess of fluoride ions
Journal Article
·
Sat Aug 01 00:00:00 EDT 1992
· Soviet Electrochemistry
·
OSTI ID:433445