Development of continuous separation system for rare earth with solvent impregnated resin

研究了间歇式和柱式溶剂浸渍树脂分离稀土的工艺。作为应用，开发了从含七组分的重稀土渣中分离Dy.Y.Tm和Yb的工艺。主要研究结果如下：1)测定了浸渍树脂的孔径分布和比表面积，证实了PC-88A在多孔树脂中的物理吸附。3)浸渍树脂对稀土的吸附是通过溶液中的金属离子与PC-88A的氢离子发生阳离子交换反应进行的，与市售阳离子交换树脂的吸附速度相差不大。用无机酸如盐酸洗脱很容易。4)通过吸附和…获得了分离的最佳条件在不同的柱径和高度下进行了更多的洗脱实验。5)柱分离实验发现，吸附步骤回收原子序数较小的稀土元素，而对于二元溶液，如Nd/Sm和Tb/Ho，洗脱步骤回收原子序数较大的稀土元素。6)我们研制了捕捉突破点的检测器，该检测器通过测量适当波长的可见光和紫外光的吸光度来找到准确的突破点。7)建立了从重稀土渣浸出液中分离Dy、Y、Tm、Yb的流程，实现了在不同浓度的盐酸(PH2-PH0)洗脱液中Dy、Y、Tm、Yb的近乎完美的回收。较少

Investigation of a batch and a column solvent impregnated resin process was carried out for the separation of rare earth. Furthermore, the separation process of Dy.Y.Tm, and Yb from the heavy rare earth residue containing seven components was developed as an application. The results obtained are summarized as follows ;1) Measurement of pore diameter distribution and specific surface area of the impregnated resin proved physical adsorption of PC-88A in the pore of the porous resin. Amberlite XAD-7.2) The impregnated resin can recycle 20 times from the results of ageing test.3) Adsorption of rare earth with the impregnated resin takes place by the cation exchange reaction between metal ion in the solution and hydrogen ion of PC-88A.There is little difference in adsorption speed between the impregnated resin adn commercial cation exchange resins. Elution is operated easily with inorganic acid such as hydrochloric acid.4) Optinum conditions for the separation were obtained by adsorption an … More d elution experiments at various diameters and heights of the column. It is possible to apply the impregnated resin to the treatment of a large amount of waste solution using longer diameter of column and there is strong relationship between separationability and column height.5) It was found from a column separation test that rare earth with the smaller atomic number is recovered in the adsorption step, while rare earth with the larger atomic number is recovered in the elution step in the case of binary solutions, such as Nd/Sm and Tb/Ho.6) The detector to catch a breakthrough point was develped by us and the detector made it possible to find the exact breakthrough point by measurement of visible and ultra violet absorbance of proper wave length. We designed the detector system and completed the system of decision of a breakthrough point.7) We established the process in which Dy, Y,Tm, and Yb are separated from the leaching solution of heavy rare earth residue and accomplished the almost perfect recovery of Dy, Y,Tm and Yb at various concentrations of hydrochloric acid (pH2-pH0) as an eluent using a development-coulumn at elution process. Less