用络合吸附色层法提纯稀土化合物的研究

本文提出了一种用络合吸附色层法从稀土化合物中除去铁、铜、钴、镍和铅等重金属杂质的方法。研究结果表明:将稀土化合物的溶液通过由掺和均匀的活性炭和络合剂组成的色层柱时,能从稀土化合物中除去上述杂质,到ppm数量级:Fe<0.57,Cu<0.5,Co<0.2,Ni<1.0,Pb<0.2,从而提供了一个高效率和大容量的提纯稀土化合物的方法。作者研究了各种络合剂的效率、色层柱的最佳工作条件,并提出了色层柱中反应的机理。

PURIFICATION OF RARE EARTH COMPOUNDS BY THE CHROMATOGRAPHIC ADSORPTION ACCOMPANIED WITH COMPLEX-FORMATION

A method of chromatographic adsorption accompanied with complex-formation was developed for purifying rare earth salts from heavy metal impurities. This method provides a means to remove the following heavy metal impurities from rare earth salts to an extent of ppm level: Fe<0.57, Cu<0.5, Co<0.2, Ni<1.0 and Pb<0.2, by simply passing the solution through a chromatographic column made up of blended active charcoal and complexing agent. This method enables purification to be accomplished with a higher efficiency and in a larger capacity than other methods. The efficiency of different complexing agents and the optimum conditions have been studied. A possible reaction mechanism in the chromatographic column has been suggested as follows: 1/3Fe³⁺ (ι) + QH(s) = QFe_1/3 (s)+H+(ι).