Method for extracting rare earth from emulsion liquid membrane

Abstract

The invention belongs to the field of rare earth metallurgy and provides a method for extracting rare earth from strong-acid leachate of phosphates containing rare earth. The method is characterized by comprising the following steps of stirring oil phases and an internal-phase resolving agent, namely an HCl solution with the concentration of 2-12mol / L, according to the volume ratio of 1:1 to prepare an emulsion at a high speed, wherein the oil phases include 4-14% (volume fraction, the same below) of a mobile carrier, namely phenylamine, 2-12% of a surfactant T154 and a film solvent, namely sulfonated kerosene; stirring at a low speed, and extracting rare earth in leachate, wherein the volume ratio of the emulsion to external-water-phase leachate is 1:10 to 1:100, and the highest extracting efficiency of the extracting system to rare earth in phosphate leachate can be up to more than 92%.

Description

technical field [0001] The invention belongs to the field of rare-earth metallurgy and provides a method for extracting rare-earth from the strongly acidic leaching solution of phosphate rock containing rare-earth. Background technique [0002] Most of the rare earth resources in my country come from low-grade rare earth mines. At present, the ore is mainly treated by leaching with electrolyte solution, and oxalic acid or ammonium bicarbonate is used to precipitate rare earths for leachate treatment, and the separation and extraction effect is poor. At present, there is still a considerable gap between my country and foreign advanced countries in the research fields of deep processing of rare earths and development of new materials. In order to efficiently extract rare earth elements, it is necessary to seek a low-cost and high-efficiency separation technology. The high-efficiency selectivity, high orientation, and great permeability of liquid membrane separation technology...

AI Technical Summary

Problems solved by technology

[0004] Xie Zinan et al. used P204 and P507 as mobile carriers, T154 as surfactant, 6mol / L hydrochloric acid as internal phase resolver, sulfonated kerosene as membrane solvent, and oil-to-internal ratio of 1:1 to prepare emulsified liquid membrane for phosphate rock leaching solution. For the extraction of low-concentration rare earth elements, for a solution with a pH of 1 and a concentration of 100mg / L, the ratio of milk to water is 1:10, and the extraction rate can reach a maximum of 79.93%. However, as the acidity increases, the extraction efficiency decreases a lot. =0.2, the extraction rate is only 54.71%

In summary, it can be seen that P204 and P507 are used as mobile carriers to prepare liquid films in strong acidic media, which cannot efficiently extract rare earth elements. Therefore, before extraction, it is necessary to reduce the acidity of the phosphate rock leachate with high acidity, and increase the operation of adjusting the pH value. process, which increases production costs