异丙基膦酸单异辛酯负载树脂用于萃取色层以分离稀土元素

Chromatographic Separation of Rare Earths Elements ( Ⅲ) by Mono-iso-octyl Isopropylphosphonate Loaded Resin

本文报道异丙基膦酸单异辛酯负载树脂分离稀土(Ⅲ)的性能。实验结果表明采用不同浓度的稀盐酸淋洗可依次分离15种稀土(Ⅲ)。除钇(Ⅲ)/铒(Ⅲ)对(R.1.0)外,其余各相邻稀土(Ⅲ)均达到基线分离(R_a≥1.5)。所用酸度不超过2.0mol/L,低于常用的磷酸双(2-乙己基)酯(HDEHP)和2-乙已基膦酸单2-乙己基酯(HEHEHP)所需酸度。

The behavior of mono-iso-octyl isopropylphosphonate, which is impregnated into macroreticular poly (methyl methacrylate)resin is described in the separation of rare earths (Ⅲ ). With 4 different concentrations of dilute HC1 as eluent,l5 rare earths( Ⅲ ) may be separated successively. Except the Y( Ⅲ ) /Er( Ⅲ ) pair (R_g 1.0),other neighboring RE pairs are separated clearly (R_g≥ l.5). The acidity for elution at most is 2.0 mol/L, which is lower than those required by the method using bis(2-ethylhexyl)phosphate or mono-(2-ethylhexyl) 2-ethylhexylphosphonate in RE separation. The distribution ratios between extractant-load-ed resin and dilute HCl for RE( Ⅲ ) have been determined.