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

RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE

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 Ruiqin，

WEI Yuezhou，

Daisuke Tozawa，

XU Yuanlai，

Shigekazu Usuda，

Hiromichi Yamazaki，

Keizo Ishii，

Yuichi Sano，

Yoshikazu Koma

Nuclear Science and Techniques

Vol.22, No.1

pp.18-24

Published in print 20 Feb 2011

DOI：10.13538/j.1001-8042/nst.22.18-24

43801

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.

High level liquid waste (HLLW)Minor actinide (MA)Rare earth (RE)PartitioningExtraction chromatographySilica-based CMPO extraction resinStability

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