METHOD TO DECONTAMINATE SPEND ION-EXCHANGE RESIN Russian patent published in 2012 - IPC G21F9/12 

FIELD: power engineering.

SUBSTANCE: method to decontaminate spent ion-exchange resin, including changeover of radionuclides sorbed on the ion-exchange resin into a solution of acid sodium salts, treatment of a decontaminating solution from caesium radionuclides on a composite ferrocyanide sorbent and pH correction. Prior to treatment of the decontaminating solution from caesium radionuclides, the solution is treated from cobalt radionuclides by addition of alkali to the range of pH 2.5÷11.7 and co-deposition of cobalt radionuclides with oxides of ferrum (III), desorbed from the ion-exchange resin, with subsequent separation of residue. The treated decontaminating solution is returned into a reservoir of an initial solution. The pH value is corrected to 0.5-4.0 by addition of mineral acids, and the solution is used repeatedly for decontamination of fresh portion of the spent ion-exchange resin.

EFFECT: invention makes it possible to reduce volume of radioactive wastes subject to burial or controlled storage due to higher efficiency of decontamination of radionuclides and higher efficiency of decontaminating solution treatment by selective methods.

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