Encrustation Prevention of Zirconium Molybdate Hydrate

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

    Research output: Contribution to journalArticle

    1 Citation (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

    Fingerprint

    Hydrates
    Zirconium
    Nitric Acid
    Nitric acid
    Nuclear fuel reprocessing
    Molybdenum
    Fission products
    Spent fuels
    Nuclear fuels
    zirconium molybdate
    Crystals
    Temperature

    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

    Cite this

    Encrustation Prevention of Zirconium Molybdate Hydrate. / Arai, Takahiro; Ito, Daiyu; Hirasawa, Izumi; Miyazaki, Yasunori; Takeuchi, Masayuki.

    In: Chemical Engineering and Technology, 01.01.2018.

    Research output: Contribution to journalArticle

    Arai, Takahiro ; Ito, Daiyu ; Hirasawa, Izumi ; Miyazaki, Yasunori ; Takeuchi, Masayuki. / Encrustation Prevention of Zirconium Molybdate Hydrate. In: Chemical Engineering and Technology. 2018.
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