Abstract
Solubility relationships at 300°C in the five-component system UO 3CuONiOSO 3H 2O, and its included aqueous four- and three-component systems, have been investigated. Also reported are a few data on the analogous D 2O system. In order to gain over-all information in a relatively short period of time, the experimental program consisted in determining ternary L + S, quaternary L + 2 S, and quinary L + 3 S curves at constant temperature for which, by definition, one, two and three solid phases, respectively, were in equilibrium with a liquid phase. For any set of experiments containing the same solid phases the SO 3 concentration was varied in order to give a solubility curve as a function of this variable. Accordingly, skeletal solubility data, obtained for the five-component system and its accessory four- and three-component systems, gave an over-all description of the solubility equilibria at 300° in the condensed system. Comments are made regarding the nature of the species in solution, the general shape of some of the solubility curves, the correlation of solid-liquid with liquid-liquid equilibria, and a specific application to aqueous homogeneous reactor fuels.
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