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

本文对溶剂浸渍树脂法分离稀土进行了间歇式和间歇式的研究。在此基础上，开发了从七组份重稀土渣中分离Dy、Y、Tm、Yb的工艺流程。结果表明：（1）通过对浸渍树脂的孔径分布和比表面积的测定，证明PC-88 A在多孔树脂的孔中发生了物理吸附。Amberlite XAD-7.2）浸渍树脂的老化试验结果表明，浸渍树脂可循环使用20次。3）浸渍树脂对稀土的吸附是通过溶液中的金属离子与PC-88 A中的氢离子进行阳离子交换反应进行的，其吸附速度与市售阳离子交换树脂相差不大。用无机酸如盐酸洗脱，操作简便。4）通过吸附分离， ...更多信息 d洗脱实验在不同直径和高度的柱。可以将浸渍树脂应用于使用较长直径的柱的大量废液的处理，并且分离能力与柱高度之间存在强关系。5）从柱分离试验发现，具有较小原子序数的稀土在吸附步骤中被回收，虽然在二元溶液的情况下在洗脱步骤中回收具有较大原子序数的稀土，例如Nd/Sm和Tb/Ho。6）我们研制了一种捕捉穿透点的检测器，该检测器通过测量适当的样品的可见和紫外吸光度，波长7）建立了从重稀土渣浸出液中分离Dy、Y、Tm、Yb的工艺流程，并采用展开-库仑洗脱法，在不同浓度盐酸（pH 2-pH 0）的淋洗液中，实现了Dy、Y、Tm、Yb的几乎完全回收。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