Collect. Czech. Chem. Commun. 1983, 48, 41-51

Extraction of hexavalent uranium from citrate medium by the toluene solution of trilaurylamine

Petr Vaňura and Libor Kuča

Nuclear Research Institute, 250 68 Řež


Complexes of the type (UO2HA)p(TLA)q(H3A)r are formed in the extraction of uranyl by the toluene solutions of trilaurylamine (TLA) from the isomolar aqueous phase formed by 1M-(H, Na,(UO2)0.5)3A, where H3A is citric acid. The extraction was studied at pH 1.62 with the equilibrium concentration of uranium in the aqueous phase in the range 10-4 -10-1 mol l-1 and with TLA concentration in the organic phase ranging from 0.0305 to 0.308 mol l-1. Complexes with q=5 and p+r=3 predominate in the extraction by TLA solutions of lower concentrations (c(TLA) = 0.0305 mol l-1). The fraction of more associated complexes (q=8-9, q - (p+r=0-2) increase with the increase of TLA concentration.