二烷基单硫代膦酸萃淋树脂吸附重稀土(Ⅲ)的研究

Adsorption of Heavy Rare Earths(Ⅲ) With Levextrel Resin Cyanex 302

本文研究了Cyanex302萃淋树脂从硝酸介质中吸附重稀土（Ⅲ），吸附能力为Lu＞Yb＞Tm＞Er＞Ho＞Dy＞Tb＞Gd。考察了平衡水相酸度、稀土浓度、温度等对吸附平衡的影响。计算了重稀土（Ⅲ）间的平均分离系数β~z+1_z＝3．55，表明分离稀土（Ⅲ）的选择性优于HDEHP、HEH／EHP萃淋树脂，有可能用于制备高纯单一重稀土。Cyanex302萃淋树脂饱和吸附稀土（Ⅲ）的红外光谱表明，P＝S键参与了配位。

The adsorption of heavy rare earths(Ⅲ ) in aqueous nitrate media with levextrel resin cyanex 302 (C-302 resin) was studied at various pH, rare earth concentrations and temperatures. The C-302 resin showed fairly good per formance for the adsorption of heavy rare earths(Ⅲ). The average separation factor β(Gd～Lu) was 3. 55, which was better than that of Cyanex 302 in heptane for liquid-liquid extraction of heavy rare earths(Ⅲ). The adsorption of the C-302 resin for Yb(Ⅲ) was 61. 0 mg/g resin, and the composition of the complex of Yb(Ⅲ) with cyanex 302 in the resin was YbL3· HL. In addition, the mechanism of the adsorption of C-302 resin was also studied by IR spectroscopy. The C-302 resin may be of use in the separation of high purity heavy rare earths (Ⅲ ).