The increasing demand for high-purity rare earths and their compounds promoted the separation technology of rare earths. In this work, the mixtures of sec-nonylphenoxy acetic acid (CA100) and alkylated phosphine oxides (Cyanex923 and Cyanex925) were used as extractants instead of single CA100 for high-efficiency extraction of rare earths from chloride medium. Compared with single CA100 , the mixture of CA100 and Cyanex923/Cyanex925 could improve the selectivity of yttrium (Y) extraction from the lanthanoids based on their separation factors. The synergistic effects of CA100 and Cyanex923 on lanthanum (III) extraction were investigated by using the methods of slope analysis and constant mole to determine the extraction reaction. The reaction product, equilibrium constants, formation constants, and the thermodynamic functions were determined. The synergistic extraction of lanthanum (III) with CA100 and Cyanex923 was proved to be endothermically driven.

对高纯稀土及其化合物的需求不断增加，推动了稀土分离技术的发展。在这项工作中，仲壬基苯氧基乙酸 (CA100) 和烷基化氧化膦 (Cyanex923 和 Cyanex925) 的混合物被用作萃取剂，而不是单一的 CA100，用于从氯化物介质中高效萃取稀土。与单独的CA100相比，CA100和Cyanex923/Cyanex925的混合物可以提高镧系元素中钇（Y）的提取选择性，这是基于它们的分离因素。采用斜率分析法和恒摩尔法确定萃取反应，研究了CA100和Cyanex923对镧(III)萃取的协同作用。确定了反应产物、平衡常数、形成常数和热力学函数。