Izvestiya vuzov. Yadernaya Energetika

The peer-reviewed scientific and technology journal. ISSN: 0204-3327

Influence of inorganic ligands on effectiveness of radioactive waste ion-exchange processing

4/04/2015 2015 - #01 Fuel cycle and nuclear waste management

Chugunov A.S. Rumyantsev A.V. Vinnitskiy V.A. Nechaev A.F.

DOI: https://doi.org/10.26583/npe.2015.1.13

UDC: 621.039.735

Liquid radioactive wastes generated in various fields of nuclear science and technology, generally contain salts of mineral acids, which concentration can exceed by several orders of magnitude the concentration of radioactive polyvalent metal ions. Thus, formation of metal cations and acid anions complexes is possible. To evaluate the effect of inorganic ligands on the cation’s sorption characteristics, the method of elution of metal ions (cobalt, magnesium) from cation exchanger with sodium was applied. The dependence of the retention time of polyvalent metal ions by Dowex-50х8 on the Leden’s function has been investigated. It is proved that the ligands of mineral acids can have a noticeable effect on the cation exchange efficiency. It is established that the forming multivalent complexes have larger impact to the ion exchanger sorption behavior, as compared to the neutral complexes, despite the stability value of the multivalent complexes is at least the order of magnitude less than that of the neutral complexes.

Some practical methods to minimize the impact of inorganic ligands on the ion-exchange effectiveness are suggested.

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liquid radwaste ion exchange complexation inorganic ligands