Feasibility of Using Di-Dodecyl-Di-Octyl Diglycolamide for Partitioning of Minor Actinides from Fast Reactor High-Level Liquid Waste

作者：Ravi Jammu; Venkatesan K A^*; Antony M P; Srinivasan T G; Rao P R Vasudeva

来源：Solvent Extraction and Ion Exchange, 2014, 32(4): 424-436.

DOI：10.1080/07366299.2013.866857

• actinide partitioning
• Solvent extraction
• high-level liquid waste
• fission product
• diglycolamide

The unsymmetrical diglycolamide, di-dodecyl-di-octyl diglycolamide (D(3)DODGA) is a modifier-free extractant proposed for partitioning of trivalent actinides from nitric acid medium. D(3)DODGA has been evaluated for the feasibility of using it in the absence of a phase modifier, for the partitioning of minor actinides from fast reactor high-level liquid waste (FR-HLLW). The extraction behavior of various metal ions present in the simulated FR-HLLW was studied in a solution of 0.1 M D(3)DODGA/n-dodecane from nitric acid medium. The distribution ratio of about 20 metal ions was measured as a function of concentration of nitric acid and other interfering ion. The extraction was found to be strongly dependent on the oxidation state of the metal ion. The extraction of Am(III) from 3-4 M nitric acid medium was quantitative in a single contact. However, it was accompanied by the quantitative extraction of fission products such as trivalent lanthanides (Ln(III)), Y(III), and Zr(IV). The extraction of Sr(II), Pd(II), and Ru(III) in 0.1 M D(3)DODGA/n-dodecane was not insignificant, but quite low. The extraction of Ba(II), Ni(II), Mo(VI), and Fe(III) was marginal and the extraction of Co(II), Sb(III), Mn(II), and Cs(I) in 0.1 M D(3)DODGA/n-dodecane was negligible. Our results indicated that 0.1 M D(3)DODGA/n-dodecane is a promising candidate for the separation of trivalent actinides from fast reactor high-level liquid waste containing significant quantities of trivalent lanthanides and actinides.

• 出版日期2014-6-7