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乾式再処理より発生する塩廃棄物の酸化物への転換処理

Oxide conversion of salt waste from dry reprocessing

佐藤 史紀 ; 照沼 仁*; 新井 修*; 明珍 宗孝

Sato, Fuminori; Terunuma, Hitoshi*; Arai, Osamu*; Myochin, Munetaka

乾式再処理から発生する塩廃棄物の処理を目的に、酸化ホウ素(B$$_{2}$$O$$_{3}$$)と水蒸気を用いた酸化物への転換法の検討を行った。CsCl塩及びNaCl-CsCl共晶塩を対象とした処理試験を実施し、転換率等の基礎化学データを取得した。さらに、この処理法の化学反応を理解するため、溶融塩(NaCl, CsCl),溶融酸化物(NaO, Cs$$_{2}$$O, B$$_{2}$$O$$_{3}$$)及びガス(H$$_{2}$$O, Ar, HCl, NaCl, CsCl)を考慮した、熱力学平衡計算に基づく反応解析を実施した。当該解析の妥当性を実験との比較で確認したうえ、適切な酸化転換の処理条件(処理温度,水蒸気及びB$$_{2}$$O$$_{3}$$付加量等)を検討した。

Oxide conversion using water vapor and boron oxide (B$$_{2}$$O$$_{3}$$) was studied to treat salt waste from dry reprocessing. Parameter tests to CsCl and NaCl-2CsCl salt were performed and fundamental data such as conversion rate, etc. were acquired. To understand the process behavior, a reaction analysis based on thermodynamic equilibrium calculation considering salt (NaCl, CsCl), oxide (Na$$_{2}$$O, Cs$$_{2}$$O, B$$_{2}$$O$$_{3}$$) and gas (H$$_{2}$$O, Ar, HCl, NaCl, CsCl) phase was performed. The validity of analysis was confirmed by comparison with the experiment. Using this result, process condition of the oxide conversion (ex. temperature, added amount of H$$_{2}$$O and B$$_{2}$$O$$_{3}$$, etc.) was discussed.

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