Encrustation Prevention of Zirconium Molybdate Hydrate

Takahiro Arai, Daiyu Ito, Izumi Hirasawa, Yasunori Miyazaki, Masayuki Takeuchi

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    In nuclear fuel reprocessing, spent nuclear fuel is dissolved by a nitric acid. It is now known that molybdenum and zirconium in fission products react to form zirconium molybdate hydrate (ZMH). ZMH adheres to the inner surface of reprocessing equipment, which affects the extraction efficiency in the subsequent extraction process. Therefore, a new prevention method of ZMH encrustation is required for stable plant operation. In this study, the encrustation amount of ZMH was investigated. Observing the deposition process, it was clarified that ZMH fine crystals were generated and agglomerated, followed by the rapid deposition. The encrustation amount of ZMH decreased as temperature or initial Mo/Zr mole ratio increased, or as the concentration of a nitric acid was reduced.

    Original languageEnglish
    JournalChemical Engineering and Technology
    DOIs
    Publication statusAccepted/In press - 2018 Jan 1

    Keywords

    • Encrustation
    • Nuclear fuel reprocessing
    • Reaction crystallization
    • Relative supersaturation
    • Zirconium molybdate hydrate

    ASJC Scopus subject areas

    • Chemistry(all)
    • Chemical Engineering(all)
    • Industrial and Manufacturing Engineering

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