Joint solubility of uranyl nitrate and plutonyl nitrate in nitric acid solutions

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Abstract

The solubility of hexavalent plutonium and uranium nitrates in nitric acid solutions with the ratios in initial solutions Pu/(Pu + U) = 0.3 ± 0.015 (main data), Pu/(Pu + U) = 0.25 ± 0.025, and Pu/(Pu + U) = 0.5 ± 0.025 (single compositions) at +25, +15, and +5°C (±3) was determined by the method of isohydric crystallization. The calculated solubility isotherms of plutonyl and uranyl nitrates are presented in a wide range of nitric acid concentrations.

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About the authors

E. D. Filimonova

Bochvar High-Tech Research Institute of Inorganic Materials

Author for correspondence.
Email: edfilimonova@bochvar.ru
Russian Federation, ul. Rogova 5a, Moscow, 123098

V. I. Volk

Bochvar High-Tech Research Institute of Inorganic Materials

Email: edfilimonova@bochvar.ru
Russian Federation, ul. Rogova 5a, Moscow, 123098

References

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2. Fig. 1. Optical spectra of a nitric acid solution of uranyl and plutonyl nitrates on the 2nd (1) and 4th (2) days after stabilization of 100% Pu(VI).

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3. Fig. 2. Appearance of NUP crystals: 1 – crystals and mother liquor, initial proportion Pu/(Pu + U) = 0.25; 2 – crystals after drying in a desiccator, initial proportion Pu/(Pu + U) = 0.5.

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4. Fig. 3. Calculated solubility of NU in nitric acid solutions of NUP, initial proportion Pu/(Pu + U) = 0.3.

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5. Fig. 4. Calculated solubility of NP in nitric acid solutions of NUP, initial proportion Pu/(Pu + U) = 0.3.

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6. Fig. 5. Conodes of the compositions of the initial solutions and equilibrium liquid phases A4–A8 and the intersection of the [NUP] axis with their linearizers.

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