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Counter-current extraction and separation of Nd from Sr, Zr and Pd by TDdDGA, ${it N,N,N',N'}$-tetradodecyl-diglycolamide

Sasaki, Yuji  ; Asakura, Toshihide; Kitatsuji, Yoshihiro  ; Morita, Yasuji  ; Kimura, Takaumi 

Diglycolamide, DGA, compounds have the strong extractability with trivalent, tetravalent and hexavalent actinides (An) from nitric acid to n-dodecane. Since DGA connecting with the long alkyl chain, TDdDGA (${it N,N,N',N'}$-tetradodecyl-diglycolamide), has the high extraction capacity and suppresses to form the third phase with Nd, we used TDdDGA to demonstrate the counter-current extraction, prior to the hot test. In this experiment we use four elements, i.e., Sr, Pd, Zr and Nd, as the typical fission products and a representative ion of An(III) and lanthanides, to confirm the extraction and the separation properties, these four elements are extractable by TDdDGA. After determination of the optimum condition on the extraction and separation of Nd from other elements by the calculation using D values, we perform the counter-current extraction using the mixer-settler equipment.

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