Na/Ca selectivity coefficients of montmorillonite in perchlorate solution at different temperatures

Aku Itälä, Arto Muurinen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    The Finnish spent nuclear fuel disposal is based on the Swedish KBS-3 concept in crystalline bedrock. The concept aims at long-term isolation and containment of spent fuel in copper canisters surrounded by bentonite buffer which mostly consists of montmorillonite. For the long-term modelling of the chemical processes in the buffer, the cation-exchange selectivity coefficients have to be known at different temperatures. In this work, the cation-exchange selectivity coefficients and cation-exchange isotherms were determined in batch experiments for montmorillonite at three different temperatures (25 oC, 50 oC and 75 oC). Five different ratios of NaClO4/Ca(ClO4)2 were used in the experimental solutions. After equilibration the solution and montmorillonite were separated and the solution analysed to get the desired exchange parameters. The experiments were modelled with a computational model capable of taking into account the physicochemical processes that take place in the experiment
    Original languageEnglish
    Title of host publicationMRS Proceedings
    Subtitle of host publicationSymposium NW – Scientific Basis for Nuclear Waste Management XXXV
    PublisherMaterials Research Society
    Pages335-340
    ISBN (Print)978-1-6274-8264-6
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA4 Article in a conference publication
    Event2012 MRS Spring Meeting - San Francisco, CA, United States
    Duration: 9 Apr 201213 Apr 2012

    Publication series

    SeriesMaterials Research Society Symposia Proceedings
    Volume1475

    Conference

    Conference2012 MRS Spring Meeting
    CountryUnited States
    CitySan Francisco, CA
    Period9/04/1213/04/12

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    Cite this

    Itälä, A., & Muurinen, A. (2012). Na/Ca selectivity coefficients of montmorillonite in perchlorate solution at different temperatures. In MRS Proceedings: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV (pp. 335-340). Materials Research Society. Materials Research Society Symposia Proceedings, Vol.. 1475 https://doi.org/10.1557/opl.2012.596