Separation of Dy,Y,Tm and Yb from Heavier Rare Earth Residue by Column Method Using Solvent Impregnated Resin : Separation of rare earth with solvent impregnated resin (3rd Report)

摘要

Heavier rare earth which is contained in a small amount in ores such as bastna site and monazite has been accumulated as heavier rare earth residue without doing separation and purification due to its small demand.The heavier rare earth residue includes seven rare earth elements such as Tb,Dy,Ho,Y,Er,Tm and Yb.The separation and recovery process of Dy,Y,Tm and Yb from leached solution of the heavier rare earth residue was investigated by using a column method with a solvent impregnated resin.The solvent impregnated resin was prepared by impregnation of organophosphorous extractant whose trade name is PC-88A into a macro porous resin, Amberlite XAD-7. It was almost impossible to separate them in simple adosorption and elution steps.However,we attained to individually separate Dy, Y, Tm and Yb from the leached solution first by changing eluent concentration from pH 2 to 2N HC1 in the elution step,and secondly by using a development column and changing eluent concentration in the elution step.The separation process flow was proposed for raw materials containing rare earth by using the conventional solvent extraction method and solvent impregnated resin method.