A. A. Naumov, E. A. Puzikov, A. V. Bizin, P. I. Soroka, N. D. Goletskii
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Extraction of Rare Earth Elements and Americium with a Solution of Zirconium Salt of 2-Ethylhexyl Hydrogen 2-Ethylhexylphosphonate in Hydrocarbons and Its Mathematical Description
The extraction of rare earth elements and americium from nitric acid media with solutions of 2-ethylhexyl hydrogen 2-ethylhexylphosphonate (P507 or PC-88A) in Isopar M diluent was studied. A set of chemical extraction reactions was proposed for describing the dependence of the rare earth element (REE) distribution ratios on the nitric acid concentration with an error of less than 10%. The degree of zirconium extraction from nitric acid solutions into 30% P507 exceeds 99.5%. In the process, the zirconium salt of P507 (ZS P507) is formed in the solvent phase; it exhibits secondary extraction properties with respect to REEs. The dependences of the REE distribution ratios in the ZS P507 solution on the nitric acid concentration can be described using the extraction reactions similar to the equations for REE extraction with P507 solutions.
期刊介绍：
Radiochemistry is a journal that covers the theoretical and applied aspects of radiochemistry, including basic nuclear physical properties of radionuclides; chemistry of radioactive elements and their compounds; the occurrence and behavior of natural and artificial radionuclides in the environment; nuclear fuel cycle; radiochemical analysis methods and devices; production and isolation of radionuclides, synthesis of labeled compounds, new applications of radioactive tracers; radiochemical aspects of nuclear medicine; radiation chemistry and after-effects of nuclear transformations.
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