Volume 43, Issue 6 pp. 1059-1064
Research Article

Effect of Anti-Encrustation Additives on Zirconium Molybdate Hydrate

Risako Abe

Corresponding Author

Risako Abe

Waseda University, Department of Applied Chemistry, School of Advanced Science and Engineering, 3-4-1 Okubo, Shinjuku, 169-8555 Tokyo, Japan

Correspondence: Risako Abe ([email protected]), Waseda University, Department of Applied Chemistry, School of Advanced Science and Engineering, 3-4-1 Okubo, Shinjuku, 169-8555 Tokyo, Japan.Search for more papers by this author
Izumi Hirasawa

Izumi Hirasawa

Waseda University, Department of Applied Chemistry, School of Advanced Science and Engineering, 3-4-1 Okubo, Shinjuku, 169-8555 Tokyo, Japan

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Yasunori Miyazaki

Yasunori Miyazaki

Japan Atomic Energy Agency, Tokai-mura, Naka-gun, 319-1194 Ibaraki, Japan

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Masayuki Takeuchi

Masayuki Takeuchi

Japan Atomic Energy Agency, Tokai-mura, Naka-gun, 319-1194 Ibaraki, Japan

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First published: 12 March 2020
Citations: 2

Abstract

Anti-encrustation additives were mainly investigated in nitric acid solution with zirconium (Zr), molybdenum (Mo), and tellurium (Te) to prevent the encrustation of zirconium molybdate hydrate (ZMH). The ZMH generated by reaction crystallization of Mo and Zr as main fission products has a high adhesion property in spent nuclear fuel reprocessing. In addition, it is reported that Te, which is also one of the fission products, precipitates together with ZMH. Encrustation of precipitates containing Te was effectively prevented by adding molybdenum trioxide (MoO3) crystals as an anti-encrustation reagent. The encrustation amount was found to be larger than that under the condition of only Zr and Mo without Te. Consequently, it was suggested that the high adhesion property of Te affected the encrustation amount of ZMH.

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