METHOD FOR SEPARATING MINOR ACTINOID

• Main Authors: HOSHINO KUNIYOSHI, KANI YUKO, WATANABE DAISUKE
• Format: Patent
• Language: English; Japanese
• Published: 31.01.2019
• Subjects: CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; DECONTAMINATION ARRANGEMENTS THEREFOR; INORGANIC CHEMISTRY; METALLURGY; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; NUCLEAR REACTORS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PHYSICS; PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULARRADIATION OR PARTICLE BOMBARDMENT; SEPARATION; TRANSPORTING; TREATING RADIOACTIVELY CONTAMINATED MATERIAL

To provide a separation method in which MA is selectively recovered, and the number of processes of a back extraction process is reduced.SOLUTION: A separation method includes: an extraction process of bringing an organic phase that consists of extraction liquid in which first complexing agent is dissolved into contact with an aqueous phase containing minor actinoid and extracting minor actinoid to an organic phase; a cleaning process of moving minor actinoid contained in the organic phase to cleaning fluid by bringing the organic phase obtained in the extraction process into contact with cleaning fluid containing second complexing agent; a back extraction process of extracting minor actinoid contained in minor actinoid-containing extraction liquid to back extraction liquid by bringing minor actinoid-containing extraction liquid which is the organic phase obtained in the cleaning process into contact with the back extraction liquid, in which the aqueous phase in the extraction process is formed by mixing aqueous solution containing minor actinoid into cleaning fluid containing minor actinoid obtained in the cleaning process, and the first complexing agent contains phenanthroline as a molecular structure, and the second complexing agent has carboxyl group.SELECTED DRAWING: Figure 2 【課題】ＭＡを選択的に回収し、逆抽出工程の工程数を低減する分離方法を提供する。【解決手段】第一の錯化剤を溶解した抽出液からなる有機相と、マイナーアクチノイドを含む水相と、を接触させ、マイナーアクチノイドを有機相に抽出する抽出工程と、抽出工程で得られた有機相と、第二の錯化剤を含む洗浄液とを接触させることにより有機相に含まれるマイナーアクチノイドを洗浄液に移動させる洗浄工程と、洗浄工程で得られた有機相であるマイナーアクチノイド含有抽出液と、逆抽出液とを接触させることにより、マイナーアクチノイド含有抽出液に含まれるマイナーアクチノイドを逆抽出液に抽出する逆抽出工程と、を含み、抽出工程の水相は、洗浄工程で得られたマイナーアクチノイドを含む洗浄液に、マイナーアクチノイドを含む水溶液を混合したものであり、第一の錯化剤は、フェナントロリンを分子構造として含み、第二の錯化剤は、カルボキシル基を有する。【選択図】図２