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Long-Lived Radionuclides Separation


Partitioning of Long-Lived Radionuclides Using the Mixture of Short-Chain Alkyl Phosphoric Acids or their Zirconium Salts and Chlorinated Cobalt Dicarbollide

Tech Area / Field

  • ENV-RWT/Radioactive Waste Treatment/Environment

3 Approved without Funding

Registration date

Leading Institute
Khlopin Radium Institute, Russia, St Petersburg


  • Florida State University / Department of Chemistry and Biochemistry, USA, FL, Tallahassee

Project summary

The main goal of the proposed project is investigation on TPE and RE extraction from the waste solutions of moderate nitric acid content using Zirconium salt of dibutyl phosphoric acid (ZS HDBP) and their separation /partitionig in the buffer range of acidity. The usage of HDBP and/or ZS HDBP in mixture with Chlorinated cobalt dicarbollide (CCD) in the “heavy” diluent F-3 or other ones is the other the option for process development. Investigation of HDBP substitution by less soluble (in aqueous solution) analogues is also planned.

The following investigations and tests should be carried out according to the project work plan:

  • Investigation of TPE fractional separation by HDBP and its zirconium salt in different diluents, as well by its analogues (isoamyl phosphoric acid) in the buffer range of acidity with the use of the complexing agent DTPA.
  • Investigation of the solubility of short chain dialkyl phosphoric acids and their Zr salts in nitric acid solutions and in buffer media.
  • Measurement of distribution data on Cs, Sr, TPE (RE) and precipitate forming elements Zr, Mo and Fe by the solvent CCD + (HDBP or ZS HDAP) and by each of these solvents separately in the presence of complexing agents at various concentrations of these elements and of nitric acid.
  • Studies on actinide, lanthanide and precipitate forming elements interaction with dialkyl phosphoric acids and their zirconium salts in the presence of CCD.
  • Investigation of the influence of the complexing agent in aqueous solution on the complex formation in the mixed solvent and its use for element partitioning.
  • Testing of the selected solvents and complexing agents for recovery and separation of TPE, RE, Cs, Sr and precipitate forming elements on the laboratory scale centrifugal contactor using model solutions.


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