This paper reports the extraction of uranium from AR
[analytical grade] ortho phosphoric acid by D 2 EHPA [di-2 ethyl
hexyl phosphoric acid] only and D2EHPA-TOPO [tri-n-octyl
phosphine oxide] mixture. The influence of various factors
affecting the extraction mechanism such as phosphoric acid,
D 2 EHPA and TOPO concentrations have been investigated. The
effect of temperature on extraction process was studied and the
activation energy of the reaction was calculated and found to be
equal 23.1 KJ/mol. Finally, the uranium extraction mechanism
by using D2HEPA and D 2 EHPA/TOPO synergism was suggested.