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Abstract  

A solvent extraction procedure for rapid separation of uranium from complex nuclear reaction product mixtures is suggested. The procedure has been tested in batch experiments with tracer amounts of representative elements. It has also been tested with fission products and uranium tracer using the continuous chemical separation system SISAK at the Mainz TRIGA reactor.

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Congruent melting of binary compounds with non-negligible vapour pressure

I. Theoretical aspects of the congruent melting of a hydrate

Journal of Thermal Analysis and Calorimetry
Authors: J. Rouland, A. Thorén, J. Fournival, and R. Céolin

Abstract  

A theoretical temperature-specific volume-molar fraction (T-v-x) phase diagram of the binary systemA-H2O presenting a hydrateH with congruent melting is studied. The phase diagram is divided into two subsystems by the one-component phase diagram of the hydrateH. The eutectic invariant planes which occur in both subsystems are described. The relationships between the invariants are given. Isochoric and isoplethal theoretical sections are given. The one-component phase diagram of the hydrateH is described. It is pointed out that the triple line solid-liquid-vapour which relates the congruent melting is not necessarily perpendicular to the molar fraction axis. The means that the three phases, solid, liquid and vapour, have not necessarily the same composition. TheT-v-x representation gives an explanation to the deviation between the maximum of the melting curve and the stoichiometric composition of the hydrate which is often observed in theT-x binary diagramA-H2O.

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