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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

Extraction and separation of U(VI) and Th(IV) from hydrobromic acid media using Cyanex-923 extractant