Solvent extraction of scandium(III), yttrium(III), lanthanum(III) and gadolinium(III) using Cyanex 302 in heptane from hydrochloric acid solutions
Solvent extraction of scandium(III), yttrium(III), lanthanum(III) and gadolinium(III) using Cyanex 302 in heptane from hydrochloric acid solutions
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DOI：
10.1016/j.jallcom.2003.11.058
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发表时间：
2004-07
影响因子：
6.2
通讯作者：
Dong-bei Wu;Chunji Niu;Deqian Li;Yan Bai
中科院分区：
文献类型：
--
作者：
Dong-bei Wu;Chunji Niu;Deqian Li;Yan Bai
本文研究了用双（2，4，4-三甲基戊基）-单硫代膦酸（Cyanex 302，HL）的庚烷溶液作萃取剂，从盐酸溶液中萃取稀土元素Sc、Y、La和Gd。结果表明，稀土的萃取是通过以下反应进行的：[式：见文字]通过考虑金属离子与羟基配体的水相络合作用以及萃取到有机相的合理配合物，推导出萃取配合物的pH 1/2值和平衡常数。根据pH值1/2，通过控制水溶液的酸度，Cyanex 302可以实现Sc（III）、Y（III）、La（III）和Gd（III）的相互分离。
The extractions of the selected rare earths (Sc, Y, La and Gd) from hydrochloric acid solutions have been investigated using bis(2,4,4-trimethylpentyl)-mono thiophosphinic acid (Cyanex 302, HL) in heptane as an extractant. The results demonstrate that the extractions of rare earths occur via the following reaction: [Formula: see text] [Formula: see text] [Formula: see text] [Formula: see text] The pH1/2values and equilibrium constants of the extracted complexes have been deduced by taking into account the aqueous phase complexation of the metal ion with hydroxyl ligands and plausible complexes extracted into the organic phase. According to the pH1/2values, it is possible to realize mutual separation among Sc(III), Y(III), La(III) and Gd(III) with Cyanex 302 by controlling aqueous acidity.