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酸化物電解法MOX電解共析の反応解析

Reaction analysis of MOX co-deposition in oxide electrowinning process

佐藤 史紀 ; 水口 浩司; 中西 繁之; 明珍 宗孝

Sato, Fuminori; Mizuguchi, Koji; Nakanishi, Shigeyuki; Myochin, Munetaka

酸化物電解法の主工程の一つであるMOX電解共析に関して、試験及び解析の両面による検討を行った。まず基礎試験として、U-Puを用いたパラメーター試験を実施し、溶融塩の分極特性,電流効率,析出物中PuO$$_{2}$$濃度等の基礎的なデータを取得した。また、これと合わせて公開文献より入手した物性値を用い、電解挙動、特に溶融塩の分極特性に関するモデル化を試みた。このモデルについては、実際の試験結果に関する解析を行い、妥当性を確認した。最後に、開発したモデルを用いてMOX電解共析の制御因子に関する検討を行った。

MOX co-deposition process, which is one of the main parts of oxide electrowinning process, was studied by both sides of examination and analysis. Parameter tests using U and Pu were performed as basic examination, and fundamental data of the process such as polarization property of molten salt including U and Pu, current efficiency of electrolysis and PuO$$_{2}$$ concentration in recovered deposit, etc. were acquired. In addition, to analyze the process behavior, especially polarization property at electrolysis, a reaction model considering Pu$$^{4+}$$, Pu$$^{3+}$$, UO$$_{2}$$$$^{2+}$$, UO$$_{2}$$$$^{+}$$, PuO$$_{2}$$$$^{2+}$$ and PuO$$_{2}$$$$^{+}$$in molten NaCl-2CsCl salt was developed. The validity of this model was confirmed by comparison of the experimental and analytical results. Using this model behavior of chemical species in the process was studied and control factors of MOX co-deposition process were discussed.

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