Precipitation and Solubility of Uranyl Orthophosphates. II. Heterogeneous Equilibria in Solutions of: U02(NO3)2 - H3P04 - HNO3

The precipitation and dissolution of uranium(VI) from aqueous solutions containing 10-3 M uranyl nitrate and various concentrations of orthophosphoric and nitric acid is / surveyed. The concentration regions where (U02)s(P04h and U02HP04 are precipitated and/or dissolved are presented by means of typical precipitation bodies. The influence of the initial concentration ratio of nitric/ orthophosphoric acid in the precipitation system on the morphology of (U02la(P04)2 particles formed is shown by electron micrograps