二(2-乙基己基)膦酸从盐酸介质中萃取钪(Ⅲ)、钇(Ⅲ)、镧系离子(Ⅲ)和铁(Ⅲ)  

EXTRACTION OF SCANDIUM(Ⅲ),YTTRIUM(Ⅲ),LANTHANIDE(Ⅲ) AND IRON(Ⅲ) FROM HYDROCHLORIC ACID SOLUTIONS WITH DI-(2-ETHYLHEXYL) PHOSPHINIC ACID

作　　者：薛理珍 李德谦[1] 

机构地区：[1]中国科学院长春应用化学研究所稀土化学与物理开放实验室,长春130022

出　　处：《应用化学》1992年第4期21-25,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金

摘　　要：本文研究了二(2-乙基己基)膦酸(H[DEHP])的正辛烷溶液从盐酸介质中萃取钪(Ⅲ)、钇(Ⅲ)、镧系离子(Ⅲ)和铁(Ⅲ)的平衡规律。结果表明,H[DEHP]对上述离子的萃取次序是Sc^(3+)>Fe^(3+)>Lu^(3+)>Yb^(3+)>Er^(3+)>Y^(3+)>Ho^(3+)。讨论了Sc(Ⅲ)与Fe(Ⅲ)、Y(Ⅲ)、Ln(Ⅲ)(镧系离子)以及Fe(Ⅲ)与重镧系离子(Ⅲ)分离的可能性,并与HEH[EHP]萃取上述离子的性能进行了比较。借助IR、NMR和斜率法,饱和法研究了低酸度下H[DEHP]萃取Sc(Ⅲ)、Y(Ⅲ)和Ln(Ⅲ)的平衡反应,计算了浓度平衡常数和萃取反应的热力学函数。The extraction equilibrium of Sc(Ⅱ), Y(Ⅲ), Ln(Ⅲ)(Ln=Ho, Er, Yb, Lu) and Fe(Ⅲ) from HCl solutions with H(DEHP) in n-octane has been investigated. The order of extractability of the above elements is found as follows:Sc Fe>Lu>Yb>Er>Y>Ho. Y lies between Ho and Er. It is possible to separate Se(Ⅱ) from Fe(Ⅲ) and Ln(Ⅲ), and heavy lanthanide(Ⅲ) each other by H(DEHP).By the methods of slope analysis, saturation capacity and IR, NMR·spectra, the composition of extracted complexes of Sc(Ⅲ) and Yb(Ⅲ) with H(DEHP) has been determined to be Sc(HL_2)_3 and YbL_3(HL_2). The extraction mechanism of rare earths(Ⅲ) has been obtained.The equilibrium constants and thermodynamic functions of extraction reactions have also been calculated.

关 键 词：萃取 钪 钇 镧系离子 铁 H[DEHP] 

分 类 号：O614.32[理学—无机化学]