Development of Transuranium Element Recovery from High-Level Radioactive Liquid Waste

• AKAI Yoshie

  Nuclear Engineering Laboratory, Toshiba Corp.

• FUJITA Reiko

  Nuclear Engineering Laboratory, Toshiba Corp.

書誌事項

タイトル別名

• Development of Transuranium Element Recovery from High-Level Radioactive Liquid Waste. Conversion TRU Oxalates to Chlorides.
• Development of Transuranium Element Rec
• Conversion TRU Oxalates to Chlorides

抄録

The separation methods of transuranium elements (TRUs) from high-level radioactive liquid waste (HLW) are classified into two categories, such as the wet processes and dry processes. A new partitioning process which combines the wet process and dry process has been developed by Toshiba Corporation. Figure 1 shows this process which combines oxalate precipitation and electrorefining. The oxalate precipitation yields good TRU recovery and electrorefining gives good TRU separation from HLW. There are three steps in the process. First, TRUs, lanthanides and alkaline earth elements whose oxalates are lower in solubility are recovered from HLW by the addition of oxalic acid. The previous paper⁽¹⁾ shows the experimental study which satisfies the requirement of 99.9% recovery of simulated TRUs from simulated HLW by the oxalate precipitation. In the second step, theseoxalates are converted to chlorides. In the final step, the TRUs are recovered on a cathode by electrorefining after dissolving the chlorides in eutectic KC1-LiC1 salt.<BR>The TRU oxalates were converted to chlorides by inducing reactions with CoCl₂, HCl or CCl₄ at 500 °C^(2)-(4). The materials of apparatus must be using corrosion resistance at high temperature. Further, it is necessary for tetravalent TRU chlorides such as NpCl₄, whose vapor pressures are high⁽⁵⁾, to be recovered. Therefore, the conversion from oxalates to chlorides satisfies the requirements of no use of corrosive gas and lower reaction temperature.<BR>This note describes an experimental study to confirm the new partitioning process, which is found to satisfy the requirement for conversion of simulated TRU oxalates to chlorides without corrosive gas and at lower temperature.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　Ｎｕｃｌｅａｒ　Ｓｃｉｅｎｃｅ　ａｎｄ　Ｔｅｃｈｎｏｌｏｇｙ（日本原子力学会英文論文誌）

  Ｊｏｕｒｎａｌ　ｏｆ　Ｎｕｃｌｅａｒ　Ｓｃｉｅｎｃｅ　ａｎｄ　Ｔｅｃｈｎｏｌｏｇｙ（日本原子力学会英文論文誌） 33 (10), 807-809, 1996

  一般社団法人 日本原子力学会

キーワード

• high-level radioactive liquid wastes
• transuranium elements
• recovery
• oxalates precipitation
• electrorefining
• conversion
• chlorides
• hydrogen peroxide
• hydrochloric acid
• argon atmosphere
• temperature range 0273-0400K
• temperature dependence

詳細情報

• CRID: 1390001204096195456
• NII論文ID: 10002075697
• NII書誌ID: AA00703720
• DOI: 10.3327/jnst.33.807
• COI: 1:CAS:528:DyaK28XntFSqurY%3D
• ISSN: 18811248
• ISSN: 00223131
• NDL書誌ID: 4079948
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4079948
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可