Abstract
A systematic study of the solvent extraction of uranium(VI) and thorium(IV)
from hydrobromic acid media was performed using the neutral phosphine oxide
extractant Cyanex-923 in toluene. These metal ions were found to be
quantitatively extracted with Cyanex-923 in toluene in the acidity range
5x10-5-1x10-4 M and 5x10-5-5x10-3 M, respectively, and they are stripped from
the organic phase with 7.0 M HClO4 and 2.0- 4.0 M HCl, respectively. The
effect of the equilibrium period, diluents, diverse ions and stripping agent
on the extraction of U(VI) and Th(IV) was studied. The stoichiometry of the
extracted species of these metal ions was determined based on the slope
analysis method. The extraction reactions proceed by solvation and their
probable extracted species found in the organic phase were UO2Br2?2Cyanex-923
and ThBr4?2Cyanex-923. Based on these results, a sequential procedure for
their separation from each other was developed.
Publisher
National Library of Serbia
Cited by
5 articles.
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