Precipitation of Uranium(VI) Peroxide (UO4) in Sodium Perchlorate Solution

Abstract

Precipitation diagrams were constructed using the data obtained in experiments with direct mixing of uranyl ion ([UO 2 ] 2 + ) and hydrogen peroxide. Three days after mixing the system, equilibrium was established in the [H 2 O 2 ] t o t >[UO 2 ] t o t concentration region, resulting in stability of the concentration boundary. From this boundary condition, the solubility product (K s p = [UO 2 2 + ] x [O 2 2 - ]) was defined. The mean value of the solubility product was (1.32 ′ 0.02) x 10 - 3 6 mol dm - 3 . From the solubility border, where equilibrium was established, i.e., at [UO 2 2 + ] = 1.4 x 10 - 4 mol dm - 3 , the heterogeneous distribution diagrams of uranyl species, including the solid phase, were calculated.