Studies on the kinetics of U(VI) electro-reduction and reextraction: Pt. 1

The kinetics of U(VI) electro-reduction with system of HNO3-N2H5NO3(H2O)/UO2(NO3)2-HNO3 (30%TBP-OK) has been investigated. This is the first step of the investigation of kinetics of U(VI) electro-reduction and reextraction. The experimental apparatus employed is a constant interfacial area cell (Lewis cell) with cathode and anode in it. The dependence of U(VI) electro-reduction rates on component concentrations in two phase solutions has been measured. According to the experimental data, a kinetics of differential equation of U(VI) electro-reduction is derived. The effect of the potential of cathode, the operating temperature, the stirring speed of two phases and the interfacial area between two phases on the U(VI) electro-reduction rates has also been investigated. The definition of the specific experimental conditions is introduced, the relation between the U(VI) electro-reduction rates and the specific experimental conditions is given by an empirical equation. The process of U(VI) electro-reduction is mainly electrode reaction controlled