Cs Extraction from Chloride Media by Calixarene Crown-Ethers

Marie Simonnet, Thomas Sittel, Patrik Weßling and Andreas Geist ()
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Marie Simonnet: Japan Atomic Energy Agency, Materials Sciences Research Center, Tokai-mura 319-1195, Ibaraki-ken, Japan
Thomas Sittel: Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), 76021 Karlsruhe, Germany
Patrik Weßling: Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), 76021 Karlsruhe, Germany
Andreas Geist: Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), 76021 Karlsruhe, Germany

Energies, 2022, vol. 15, issue 20, 1-10

Abstract: Asse II salt mine, in Germany, contains low and intermediate-level radioactive waste that must be retrieved in the upcoming years. Potentially contaminated salts and brines will require treatment, with 137 Cs being the main contaminant. Cs + is problematic to selectively recover due to its chemical similarity with Na + and K + which are present in high quantities in a salt mine. This paper offers a novel solution for Cs + separation from concentrated chloride salt media by solvent extraction with calixarene-crown-ether extractants in an alcoholic diluent. The proposed solvent extracts Cs + at elevated chloride concentrations (3–4 M) while back-extraction is achieved by contacting the solvent with dilute (0.01 M) hydrochloric acid.

Keywords: Asse II salt mine; radioactive waste; cesium; chloride media; decontamination; extraction; calixarene-crown-ether (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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