عنوان مقاله [English]
In this study, the uranium recovery utilizing the bulk liquid membrane containing Alamine 336 has been investigated. The effect of uranium and sulfuric acid concentration in the donor phase, carrier concentration in the liquid membrane phase, and ammonium carbonate concentration in the acceptor phase and transport kinetics were studied. The optimum conditions of uranium transport were obtained at 0.15 mol/L H2SO4 in donor phase, 0.5 mol L-1 (NH4)2CO3 in the acceptor phase, 0.0125 mol L-1 Alamine 336 in kerosene. The results demonstrated that by increasing the concentration of sulfuric acid up to 0.15 mol/L and the Alamine 336 concentration to 0.0125 mol/L, the uranium transfer increased and then decreased. The uranium transfer was decreased with an increase in initial uranium concentration. Studying the effect of time on the uranium transfer showed that the rate-controlling step is the release of uranyl from the liquid membrane phase to the acceptor phase. The kinetics of uranium transport was modeled assuming consecutive irreversible pseudo-first-order reactions. The extraction rate constant of 0.0061 min-1 and 0.0107 min-1 and the stripping rate constant of 5.56×10-4 and 12× 10-4 min-1 were obtained for liquid membrane containing Alamine 336 and sulfated Alamine 336, respectively.