Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2011, Vol. 22 ›› Issue (1): 18-24 doi: 10.13538/j.1001-8042/nst.22.18-24

• RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICIN • Previous Articles     Next Articles

Evaluation study on properties of a macroporous silica-based CMPO extraction resin to be used for minor actinides separation from high level liquid waste

LIU Ruiqin1 WEI Yuezhou1,2,* Daisuke Tozawa2 XU Yuanlai2 Shigekazu Usuda2 Hiromichi Yamazaki2 Keizo Ishii2 Yuichi Sano3 Yoshikazu Koma3   

  1. 1School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China 2Cyclotron and Radioisotope Center, Tohoku University, Aoba 6-3, Aramaki-Aoba-ku, Sendai, Miyagi, 980-8578, Japan 3Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki, 319-1195, Japan
LIU Ruiqin, WEI Yuezhou, Daisuke Tozawa, XU Yuanlai, Shigekazu Usuda, et al.. Evaluation study on properties of a macroporous silica-based CMPO extraction resin to be used for minor actinides separation from high level liquid waste.Nuclear Science and Techniques, 2011, 22(1): 18-24     doi: 10.13538/j.1001-8042/nst.22.18-24

Abstract:

Basic properties of a silica-based octyl(phenyl)-N,N-diisobutylcarbamoyl-methylphosphine oxide (CMPO) extraction resin (CMPO/SiO2-P) was investigated. Adsorption behavior for some rare earth elements (RE) which are constituents of high level liquid waste (HLLW) and the long-term stability of the extraction resin in nitric acid solution were examined. The CMPO extraction resin was significantly stable in 3 mol·L−1 HNO3 solution at 50ºC. Furthermore, the RE(III) were efficiently separated from non-adsorptive fission product (FP) elements such as Sr(II) in a column experiment using a highly nitric acid solution. The separation behaviors of the elements are considered to result from the difference in their adsorption and elution selectivity based on the complex formation with CMPO. There was no strong dependency of RE(III) separation efficiency on feed solution flow rate. Only from the perspectives of the acid-resistant behavior of CMPO extraction resin and the elution kinetics for the metal ions with the extraction resin, the CMPO extraction resin can be used in the modified MAREC process for HLLW partitioning.

Key words: High level liquid waste (HLLW), Minor actinide (MA), Rare earth (RE), Partitioning, Extraction chromatography, Silica-based CMPO extraction resin, Stability