Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9793645 | Journal of Nuclear Materials | 2005 | 6 Pages |
Abstract
As one of the basic investigations on the group partitioning of actinides and lanthanides by a pyrochemical reductive extraction process, the distribution ratios of Pu, Am, Ce and Sm have been experimentally determined in the binary liquid LiF-AlF3/Al-Cu system at the temperature of 830 °C. The distribution ratios of Pu and Am are much larger than those of Ce and Sm. They would allow a high recovery yield of the actinides and good separation factors with lanthanides. The influence of the salt composition (LiF/AlF3 ratio) on the distribution coefficients has been investigated. Coupling the obtained experimental results and literature data, a thermodynamic model that describes the extraction in terms of Gibbs enthalpies of formation and the fluorobasicity of the melt (pF) has been developed. The activity coefficients of Sm(+II) et Ce(+III) versus the pF have been infered: they clearly reveal the difference in solvation behavior between divalent and trivalent species.
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
Olivier Conocar, Nicolas Douyere, Jérôme Lacquement,