A system and method for gradient elution extraction kinetics grouping separation of rare earth ions

Abstract

The invention relates to a system and method for gradient elution extraction dynamics grouping and separating rare earth ions. The system includes a hollow straight pipe or a plurality of hollow straight pipes, a liquid replenishing device, a liquid storage device, a spraying device and a collecting device; the hollow straight pipe There is an inlet of rare earth ion mixed solution on the upper side of the pipe wall, an outlet on the lower side, an inlet of extraction agent at the bottom, and an overflow port at the top; the nozzle of the injection device is inserted into the hollow straight pipe from the inlet of the extraction agent; the outlet of the overflow port and the collecting device The inlet is connected; the outlet of the liquid storage device is connected with the injection device, and the inlet is connected with the outlet of the liquid replenishment device. The method comprises: the organic solution droplets containing the extractant are floated up from bottom to top in a mixed aqueous solution containing various rare earth ions, and then aggregated to obtain an organic phase, the molar concentration of the extractant increases or decreases in a gradient manner, and batchwise The organic phase was collected and back-extracted separately to obtain enriched solutions containing different rare earth ions. The continuous extraction and group separation of rare earth ions are realized, the process is simple, and the separation efficiency is high.

Description

technical field [0001] The invention belongs to the field of chemical extraction and separation, and in particular relates to a system and method for gradient elution extraction dynamics grouping separation of rare earth ions. Background technique [0002] The ions of the fourteen rare earth elements of the lanthanide series (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) have similar outer electron shell structures and similar chemical properties, and the separation is very good. difficulty. At present, the common method for separating the fourteen rare earth elements of the lanthanide series is solvent extraction. The principle generally starts from the extraction equilibrium kinetics, and uses the difference in the complexation stability constants of the complexes formed between the organic extractant and the rare earth ions with different ionic radii to separate the rare earth ions from each other. In order to obtain a single rare earth, it is usually necessar...

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Problems solved by technology

Liu Anxi and others put the resin Cl-P204 adsorbed with the extractant P204 into the column, and then pumped the mixed solution containing five rare earth ions of La, Ce, Nd, Sm and Eu into the column for adsorption, and then used the concentration from 0.1mol / The rare earth ions adsorbed on the resin column were rinsed with hydrochloric acid aqueous solution with a continuous gradient change from L to 1.0 mol / L, and the effluents containing different rare earth ions were obtained at different elution times, namely La, Ce, Nd, Sm and Eu, but this method cannot realize the elution of rare earth groups, and is not suitable for mixed aqueous solutions containing more rare earth ions

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