TY - JOUR
T1 - Encrustation Prevention of Zirconium Molybdate Hydrate
AU - Arai, Takahiro
AU - Ito, Daiyu
AU - Hirasawa, Izumi
AU - Miyazaki, Yasunori
AU - Takeuchi, Masayuki
N1 - Funding Information:
This study was financially supported by the Japan Atomic Energy Agency (JAEA). We thank Waseda University Environment Safety Center for using the ICP-OES measurement. We are indebted to Y. Ike, A. Ishinabe, and J. Unno of Waseda University for many useful discussions concerning this work.
Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/6
Y1 - 2018/6
N2 - 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.
AB - 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.
KW - Encrustation
KW - Nuclear fuel reprocessing
KW - Reaction crystallization
KW - Relative supersaturation
KW - Zirconium molybdate hydrate
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U2 - 10.1002/ceat.201700663
DO - 10.1002/ceat.201700663
M3 - Article
AN - SCOPUS:85045832035
SN - 0930-7516
VL - 41
SP - 1199
EP - 1204
JO - Chemical Engineering and Technology
JF - Chemical Engineering and Technology
IS - 6
ER -