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首页> 外文期刊>Hydrometallurgy >Synergistic extraction and separation of lanthanum (III) and cerium (III) using a mixture of 2-ethylhexylphosphonic mono-2-ethylhexyl ester and di-2-ethylhexyl phosphoric acid in the presence of two complexing agents containing lactic acid and citric acid
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Synergistic extraction and separation of lanthanum (III) and cerium (III) using a mixture of 2-ethylhexylphosphonic mono-2-ethylhexyl ester and di-2-ethylhexyl phosphoric acid in the presence of two complexing agents containing lactic acid and citric acid

机译：在含有乳酸和柠檬酸的两种络合剂存在下，使用2-乙基己基膦酸单-2-乙基己基酯和二-2-乙基己基磷酸的混合物，协同萃取和分离镧（III）和铈（III）

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摘要

Lanthanum and cerium were synergistically extracted and separated in chloride medium using a mixture of 2-ethylhexylphosphonic mono-2-ethylhexyl ester (HEHEHP) and di-2-ethylhexyl phosphoric acid (D2EHPA) with lactic acid (LA) and citric acid (H_3cit) as the complexing agents. Synergistic effects were observed for the extraction of La and Ce with the mixed extractant; and the maximum synergistic coefficients were obtained at -Xhehehp = 0.8. A maximum β_Ce/La of 8.88 and the maximum extraction capacity of 53.48 g/L were obtained in the presence of two complexing agent. Organo-Ce complexes in organic phases were examined based on FT-IR, ~1H, and ~31P NMR spectra. The cation-exchange mechanism and coordination effect between Ce and P = O li-gands were verified. Results showed that the mixture system in the presence of complexing agents exhibited a higher extraction efficiency and selectivity during the extraction and separation of adjacent rare earths.
机译：使用2-乙基己基膦酸单-2-乙基己基酯（HEHEHP）和二-2-乙基己基磷酸（D2EHPA）与乳酸（LA）和柠檬酸（H_3cit）的混合物，协同萃取和分离镧和铈作为络合剂。用混合萃取剂萃取La和Ce具有协同作用。在-Xhehehp = 0.8时获得最大协同系数。在两种络合剂存在下，最大β_Ce/ La为8.88，最大萃取容量为53.48 g / L。根据FT-IR，〜1H和〜31P NMR光谱检查有机相中的有机Ce配合物。验证了Ce与P = O配体之间的阳离子交换机理和配位作用。结果表明，在络合剂存在下，混合体系在相邻稀土的萃取分离过程中具有较高的萃取效率和选择性。

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