NpO2(NO3)2 units are connected by bis(2-pyrrolidone) linker molecules with the trans-1,4-cyclohexyl bridging part (L1) to form a one-dimensional coordination polymer, [NpO2(NO3)2(L1)]n. Molecular and crystal structures of this compound are nearly identical to that of the UO22+ analogue, while its aqueous solubility is greatly enhanced, probably owing to weaker thermodynamic stability of the complexation in NpO22+ compared with that in UO22+.
Mutual separation technique of Dy and Nd in Nd magnets is studied. Dy is more valuable than Nd, and therefore, Dy should be isolated and reused. Lanthanide elements can be extracted thoroughly by using diglycolamide (DGA) extractants, and we use this reagent to recover and isolate Dy. N,N,N',N'-Tetradodecyl-DGA (TDdDGA) has a relatively high separation factor (SF) between Dy and Nd (SF: over 10) in the HNO 3 extraction system, so multi-step extraction using TDdDGA is applied to mutually separate them. In the present study, by using the condition, four extraction steps, organic phase: 0.1 M TDdDGA in n-dodecane, aqueous phase: 0.3 M HNO 3 , 92 % Dy can be recovered with 0.7 % co-extraction of Nd.
The separation of Dy from Nd has been studied from the viewpoint of recycling Dy from Nd magnets. N,N,N′,N′-tetradodecyl-DGA (TDdDGA) has a relatively high separation factor between Dy and Nd (above 10) in HNO3 medium. After basic research on batchwise multistage extractions using eight extraction stages with 0.1 M TDdDGA in n-dodecane as organic phase, ten stages with an aqueous phase (0.7 M HNO3 with metals), and six stages with another aqueous phase (0.7 M HNO3 without metals), approximately 99% of Dy was recovered into the organic phase with 1% coextraction of Nd.
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