Separation of Rare Earth Elements in Multistage Extraction Columns in Chromatography Mode: Experimental Study and Mathematical Simulation

The application of liquid-liquid chromatography principles to solvent extraction processes in hydrometallurgy can greatly simplify rare earth metal separation technologies by separating multicomponent mixtures in one technological operation. In this study, the chromatographic separation of rare earth elements (REEs) in multistage extraction columns was experimentally studied under conditions of impulse sample injection-single and multiple loading of large volumes of metal salt solution into the installation. The results obtained showed the feasibility of operating sieve plate extraction columns in the liquid-liquid chromatography mode. A closed-loop recycling technology is proposed for the separation of rare earth elements in multistage extraction columns operating in the liquid-liquid chromatography mode. For further development and industrial implementation of this technology, experimental studies should be conducted on intensified multistage extraction columns, such as sectioned columns with agitators and vibrating plate columns. Computer simulation of the chromatographic separation of rare earth elements by closed-loop recycling liquid-liquid chromatography was carried out.

Automated summary

The application of liquid-liquid chromatography principles simplifies rare earth metal separation in hydrometallurgical solvent extraction processes. Experimental studies were conducted on the chromatographic separation of rare earth elements in multistage extraction columns under various loading conditions. The feasibility of operating sieve plate extraction columns in liquid-liquid chromatography mode was confirmed, and a closed-loop recycling technology was proposed for this separation process. Further experimental studies and computer simulations are needed to develop and implement this technology on intensified multistage extraction columns.