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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。
In this paper, we studied the extraction of scandium (Ⅲ), yttrium (Ⅲ), lanthanide ions (Ⅲ) and iron (Ⅲ) from a hydrochloric acid medium with n-octane solution of bis (2-ethylhexyl) phosphonic acid (H [DEHP] The balance of law. The results show that the extraction order of H [DEHP] is Sc 3 + Fe 3 + Lu 3 + Yb 3 + Er 3 + Y> ~ (3 +)> Ho ~ (3+). The possibility of separation of Sc (Ⅲ) from Fe (Ⅲ), Y (Ⅲ), Ln (Ⅲ) (lanthanide ions) and Fe (Ⅲ) from heavy lanthanide ions (Ⅲ) The performance of extracting the above ions was compared. The equilibrium reaction of Sc (Ⅲ), Y (Ⅲ) and Ln (Ⅲ) with H [DEHP] was investigated by means of IR, NMR and slope method and saturation method. The equilibrium constants of concentration and the thermodynamic functions of the extraction reaction were calculated.