Evaluation of precipitation behavior of zirconium molybdate hydrate

Liang Zhang, Masayuki Takeuchi, Tsutomu Koizumi, Izumi Hirasawa

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    In the dissolution step of spent nuclear fuel, there is a world-concern problem that zirconium molybdate hydrate precipitates as a byproduct, and accumulates in some reprocessing equipments. In order to prevent this accumulation, we have developed a new method based on the controlled reaction crystallization of zirconium molybdate hydrate (ZMH) in the reprocessing solution, followed by solid liquid separation. In order to measure the particle size of ZMH, batch crystallization experiments were conducted by varying nitric acid concentration and operating temperature. In result, almost all particle sizes scatter around 1 μm on average, despite the higher concentration of nitric aid and operating temperature, and then small particles grow up as an aggregate sticking to the crystallizer. Moreover, polymorph and color changing were observed by varying the concentration of nitric acid and reaction time. These results suggest that crystal color and adhesiveness are closely related to the particle size of ZMH. And the control of nitric acid concentration and small particle growth would be the useful technique to prevent the ZMH sticking.

    Original languageEnglish
    Pages (from-to)65-71
    Number of pages7
    JournalFrontiers of Chemical Science and Engineering
    Volume7
    Issue number1
    DOIs
    Publication statusPublished - 2013 Mar

      Fingerprint

    Keywords

    • accumulation
    • cleaning method
    • spent nuclear fuel
    • zirconium molybdate hydrate

    ASJC Scopus subject areas

    • Chemical Engineering(all)

    Cite this