了解硝酸菌对模拟高浓度废液成分中Zr(IV)与其他金属离子的亲和力

Alok Rout , S. Sriram , N. Ramanathan
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引用次数: 0

摘要

废核燃料(SNF)中Zr(IV)的存在阻碍了锕系元素和其他裂变产物的顺利和安全后处理。溶剂萃取法从硝酸进料中分离Zr(IV)是一项具有挑战性的任务,涉及到它的水化学性质和所提出的萃取剂的选择性。在此背景下,我们采用了一种强疏水性和可持续的四烷基磷基离子液体(IL):三(己基)十四烷基硝酸磷([P66614][NO3])(或硝酸硫)从各种酸性饲料中提取Zr(IV),并评估了其从快堆模拟高放废液(FR-SHLLW)溶液(燃烧:80 GWd/Te)中选择性分离的可行性。比较了[P66614][NO3]在未稀释条件下与其他类il的提取率。采用简单的络合机制,在IL相中不添加任何配体的情况下,有效地提取Zr(IV),由此推断出[P66614][NO3]的新颖性。IL阳离子的高不对称性和体积使得其阴离子(NO3-)与Zr(IV)的配位更加自由,从而实现了比其他不同阳离子(或阴离子)的IL更高的萃取因子。通过消耗非常少的IL体积(低IL与水相比)显著的萃取效率,进一步阐明了其新颖性。从提取因子的角度确定了不同辐照剂量下硝酸磷的辐射稳定性。用一种水溶性络合剂保证了[P66614][NO3]对Zr(IV)在共萃取Pd(II)中的唯一性,使后者被困在SHLLW溶液的萃余相中。最后,提出了从SHLLW溶液中选择性分离Zr(IV)的工艺流程图。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Understanding the affinity of Cyphos Nitrate for Zr(IV) over other metal ions present in simulated high level liquid waste compositions
The presence of Zr(IV) in the spent nuclear fuel (SNF) is an hindrance for a smooth and safe reprocessing of actinides and other fission products. The separation of Zr(IV) from nitric acid feed through solvent extraction route is a challenging task as far as its aqueous chemistry and the selectivity of the proposed extractants for it is concerned. In this context, we employed a strongly hydrophobic and sustainable quarternary alkyl phosphonium-based ionic liquid (IL): Tri(hexyl)tetradecylphosphonium nitrate ([P66614][NO3]) (or cyphos nitrate) for the extraction of Zr(IV) from a broad range of acidic feed and evaluated the feasibility of its selective separation from a Fast Reactor Simulated High Level Liquid Waste (FR-SHLLW) solution (Burn up: 80 GWd/Te). The extraction factor of [P66614][NO3] was compared with that observed in other classes of ILs in their undiluted condition. The efficient extraction of Zr(IV) without any additional ligand in IL phase by adopting simple complexation mechanism infers the novelty of [P66614][NO3]. High asymmetricity and bulkiness of IL cation enables more freedom to its anion (NO3-) to coordinate with Zr(IV), thereby realizing high extraction factors as compared to other ILs having different cations (or anions). The novelty was further clarified from the notable extraction efficiency by consuming very less IL volume (low IL to aqueous phase ratio). The radiation stability of cyphos nitrate was affirmed from the extraction factors at different exposed doses. The uniqueness of [P66614][NO3] for Zr(IV) over the co-extracting Pd(II) was assured using an aqueous soluble complexing agent for the later to be trapped in the raffinate phase of SHLLW solution. At end, a schematic flow-sheet was proposed for selective separation of Zr(IV) from SHLLW solution.
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CiteScore
3.70
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