Precipitation Behavior of Transuranium Elements during Denitration of High-Level Radioactive Liquid Waste by Formic Acid.

• SHIRAHASHI Koichi

  Japan Atomic Energy Research Institute

• KUBOTA Masumitsu

  Japan Atomic Energy Research Institute

抄録

The precipitation behavior of Pu, Np and Am during the denitration of high-level radioactive liquid waste (HLW) by formic acid was studied using a simulated HLW. The dissolution of the precipitate formed in denitrated HLW was also studied using oxalic acid to recover transuranium (TRU) elements from the precipitate. In the denitration, the precipitated fractions of TRU elements increased with decreasing acidity of the denitrated HLW. In the denitration at [HCOOH]/[HNO₃]=1.5, which was adopted in the partitioning process developed in JAERI, the precipitated fractions of Np and Am were only 0.6% and 0.06%, respectively, whereas that of Pu was 90%. The precipitation fractions of Pu and Np did not depend on their concentrations in the range of 6×10^-56×10^-4M for Pu and 10^-510^-3M for Np. Plutonium was not precipitated itself by polymerization or hydrolysis but coprecipitated with other elements such as Mo and Zr. It was found that the precipitate formed during the denitration of 1l of HLW could be dissolved in a 800 ml of 0.5 M oxalic acid solution.

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） 29 (6), 559-565, 1992

  一般社団法人 日本原子力学会

キーワード

• americium
• denitration
• dissolution
• formic acid
• high-level radioactive liquid waste
• neptunium
• oxalic acid
• partitioning
• plutonium
• precipitation
• waste processing

詳細情報

• CRID: 1390001204094574976
• NII論文ID: 130000826215
• DOI: 10.3327/jnst.29.559
• COI: 1:CAS:528:DyaK38XkslyntLs%3D
• ISSN: 18811248
• ISSN: 00223131
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可