Fuel Reprocessing Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
Fuel Reprocessing Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
J Hazard Mater. 2020 Nov 15;399:123050. doi: 10.1016/j.jhazmat.2020.123050. Epub 2020 May 31.
In concurrence with objectives of advanced high level nuclear waste(HLW) management, separation of chemically similar trivalent actinides and lanthanides is accomplished using TALSPEAK (Trivalent Actinide - Lanthanide Separation by Phosphorous reagent Extraction from Aqueous Komplexes) process on hollow fibre renewable liquid membrane (HFRLM). Permeability coefficient(K) of metal ions are determined under varying concentrations of diethylene triamine pentacaetic acid (DTPA) and H in the feed solution, containing Am with other metal impurities usually occurred in the HLW, and di(2-ethylhexyl) phosphoric acid (HDEHP) in liquid membrane and receiving emulsion phase. Optimized process conditions obtained are: 5 ± 0.25 L feed solution: containing 0.05 M DTPA, 1 M lactic acid and metal ions under the agitation of 400 ± 15 rpm, receiving phase: emulsion of 400 ± 15 mL 2 M HNO + 100 mL 0.2 M HDEHP/dodecane under stirring at 650 ± 25 rpm. The K of metal ions obtained under optimized process conditions are in the order: Am(III)<<Sm(III)<Nd(III)<Sr(II)<Pr(III)<U(VI) <Y(III)<Ce(III)<La(III). The maximum K = 9.24 × 10 cm min is obtained for La(III) whereas Sm(III) with K = 7.4 × 10 cm min is the most difficult lanthanide to separate from Am(III). For the single step process of HFRLM, the decontamination factor obtained for Am is 412. Agreement between K values, determined by model and experimental data are within 10 %.
与先进的高放废物（HLW）管理目标一致，使用 TALSPEAK（通过从水合络合物中萃取磷试剂分离三价锕系元素和镧系元素）工艺，在中空纤维可再生液态膜（HFRLM）上实现了化学性质相似的三价锕系元素和镧系元素的分离。在进料溶液中，当二乙三胺五乙酸（DTPA）和 H 的浓度在变化时，测定了金属离子的渗透系数（K），进料溶液中含有 Am 以及 HLW 中通常存在的其他金属杂质，以及在液态膜和接收乳液相中的二（2-乙基己基）磷酸（HDEHP）。优化后的工艺条件为：5 ± 0.25 L 进料溶液：含有 0.05 M DTPA、1 M 乳酸和金属离子，在 400 ± 15 rpm 的搅拌下，接收相：400 ± 15 mL 2 M HNO 3 + 100 mL 0.2 M HDEHP/正十二烷在 650 ± 25 rpm 的搅拌下形成乳液。在优化的工艺条件下，金属离子的 K 值按以下顺序排列：Am(III)<<Sm(III)<Nd(III)<Sr(II)<Pr(III)<U(VI) <Y(III)<Ce(III)<La(III)。对于 La(III)，最大的 K 值为 9.24 × 10 cm min，而 Sm(III)的 K 值为 7.4 × 10 cm min，是最难与 Am(III)分离的镧系元素。对于 HFRLM 的单步工艺，Am 的去污因子为 412。模型和实验数据确定的 K 值之间的一致性在 10%以内。
