Obtaining Nitric Acid Solutions of Uranyl at Deficiency of NO3– Anions

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Abstract

The dissolution of uranium oxides of various chemical compositions at different nitric acid solution concentrations and flow rates with obtaining uranyl nitrate solutions with a deficiency of NO3 – anions was studied. The dependences of the solubility of uranyl hydroxonitrates on the nitric acid deficiency relative to stoichiometry and temperature were determined. It was shown that the solubility of hydroxonitrates in these solutions is higher than the solubility of uranyl nitrates obtained with stoichiometric or excess nitric acid content. In addition, the solubility of hydroxonitrates increases with temperature. The kinetics of uranium oxide dissolution in various temperature regimes with the formation of solutions with nitric acid deficiency relative to stoichiometry were studied. The initial dissolution rate of U3O8 in uranyl nitrate solution was determined in the temperature range from 40 to 104°C.

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About the authors

V. L. Sofronov

Seversk Technological Institute, Branch of the National Research Nuclear University MEPhI

Author for correspondence.
Email: vlsofronov@mephi.ru
Russian Federation, Kommunisticheskii pr. 65, Seversk, Tomsk oblast, 636036

V. A. Lavrentyev

Siberian Chemical Plant

Email: vlsofronov@mephi.ru
Russian Federation, ul. Kurchatova 1 Seversk, Tomsk oblast, 636039

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Supplementary files

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2. Fig. 1. Dependence of the composition of the obtained solution on the HNO3/U ratio at the dissolution of U3O8 in the solution with [HNO3] = 300 g/l.

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3. Fig. 2. Solubility isotherms of UO2(NO3) x(OH)2-x in nitric acid solutions.

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4. Fig. 3. Solubility isotherm of UO2(NO3) x(OH)2-x in nitric acid solutions and the existence region of uranyl nitrate solutions. 1-3 - numbers of solutions (see text).

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5. Fig. 4. Variation of [U] and [HNO3] during the dissolution of U3O8 in uranyl nitrate solution at different temperature.

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6. Fig. 5. Temperature dependence of the degree of dissolution of U3O8 in uranyl nitrate solution.

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7. Fig. 6. Dependence of U3O8 dissolution rate in uranyl nitrate solution on the solution temperature.

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