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Encrustation Prevention of Zirconium Molybdate Hydrate
Author(s) -
Arai Takahiro,
Ito Daiyu,
Hirasawa Izumi,
Miyazaki Yasunori,
Takeuchi Masayuki
Publication year - 2018
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201700663
Subject(s) - nitric acid , zirconium , molybdate , hydrate , chemistry , molybdenum , extraction (chemistry) , deposition (geology) , fission products , inorganic chemistry , spent nuclear fuel , nuclear chemistry , nuclear fuel , radiochemistry , chromatography , paleontology , organic chemistry , sediment , biology
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.