Extraction of Fission Ruthenium in the Form of Heterometallic Complexes from Nitrate-Nitrite Solutions
VLADISLAV G. TORGOV1, RIMMA S. SHULMAN1, TAISIA V. US, TAMARA M. KORDA1, VASILIY A. BABAIN2, IGOR V. SMIRNOV2 and ANDREY YU. SHADRIN2
1Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, Pr. Akademika Lavrentyeva 3, Novosibirsk 630090 (Russia), E-mail: torgov@che.nsk.su 2Khlopin Radium Institute, 2-y Murinskiy pr. 28, St. Petersburg 194021 (Russia), E-mail: igor-smirnov@atom.nw.ru
Pages: 217-224
Abstract
The effects of nonferrous metals on extraction of the ruthenium form [RuNO(NO2)4OH]2- (An2-), prevailing in weak acid solutions, by mixed-radical phosphine oxide (L) are investigated from the viewpoint of extraction of fission ruthenium. The synergic effect has been found to be high (n103) because [RuNO(NO2)4OHMLm] heterometallic complexes are formed (M = Zn2+, Cu2+, Co2+, Ni2+; m = 1-3). Extraction constants have been determined for the complexes, and conditions of their formation and extraction from nitrate solutions have been optimized. An approach to ruthenium extraction by nitration the starting solution to convert various forms of ruthenium into the An2- form and by extracting Ru in the form of Ru/M complexes has been verified experimentally. The suggested method for extracting ruthenium was tested on real high-level waste.
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