Evaluation of precipitation behavior of zirconium molybdate hydrate

Liang Zhang*, Masayuki Takeuchi, Tsutomu Koizumi, Izumi Hirasawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


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
Issue number1
Publication statusPublished - 2013 Mar 1


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

ASJC Scopus subject areas

  • Chemical Engineering(all)


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