Affiliation:
1. Institut de Physique Nucléaire, CNRS-IN2P3, Paris-Sud, Université Paris-Saclay , Orsay Cedex 91406 , France
Abstract
Abstract
This paper is an attempt to find out thorium oxide dissolution mechanism in HNO3-HF mixture. In a previous paper, several parameters effects on thorium oxide dissolution have been described, with specific focus on hydrofluoric acid effect, which can lead to an increase of the dissolution rate if present in small amount, but precipitates as ThF4 at higher content. Based on this previous study, experimental data were fitted using several dissolution models in order to find out the best one. Finally, a revisited model based on literature and considering the ThF4 formation was proposed. It describes the main steps of dissolution and is able to fit the experimental data for a wide range of solution compositions. This point is crucial since it allows considering an extrapolation of the established model to not-yet-studied conditions.
Subject
Physical and Theoretical Chemistry
Reference18 articles.
1. Gresky, A.: Solvent extraction separation of U233 and Thorium from fission products by mean of TBP. Proceedings of the International Conference on the Peaceful Uses of Atomic Energy 9, 505 (1955).
2. Shying, M. E., Florence, T. M., Carswell, D. J.: Oxide dissolution mechanisms I. J. Inorg. Chem. 32, 3493 (1970).
3. Takeuchi, T., Hanson, K. C., Wadsworth, M. E.: Kinetics and mechanism of the dissolution of thorium oxide in hydrofluoric acid and nitric acid mixtures. J. Inorg. Nucl. Chem. 33, 1089 (1971).10.1016/0022-1902(71)80178-1
4. Barney, G. S.: The kinetics of plutonium oxide dissolution in nitric/hydrofluoric acid mixtures. J. Inorg. Nucl. Chem. 39(9), 1665 (1977).10.1016/0022-1902(77)80123-1
5. Simonnet, M., Barré, N., Drot, R., Le Naour, C., Sladkov, V., Delpech, S.: Multiparametric study of thorium oxide dissolution in aqueous solution. Radiochim. Acta 104, 691 (2016).
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献