Solvent Extraction of Differently Charged Aquanitro Forms of Rhodium (III) with Reference to the Recovery of the Fission Rhodium from Nitrate-Nitrite Solutions
VLADIMIR V. TATARCHUK, TAMARA M. KORDA, ASYA N. TATARCHUK and VLADISLAV G. TORGOV
1Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences,
Pr. Akademika Lavrentyeva 3, Novosibirsk 630090 (Russia) E-mail: tat@che.nsk.su
Pages: 755-764
Abstract
The approach to the search for efficient solvent extraction systems for fission rhodium is substantiated experimentally on the basis of characterization of the prevailing forms of rhodium differing in charge sign (cationic, anionic and neutral) in nitrate-nitrite solutions and their reactivity toward the coordination and anion-exchange extractants. The most promising processes are those involving coordination extraction of the [Rh(NO2)3(H2O)3] form, which is relatively stable in nitric solutions and can be obtained by nitration of the initial solutions. Rhodium is solvent extracted by 96
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