METHOD FOR EXTRACTION, ENRICHMENT AND RECOVERY OF RARE EARTHS FROM LOW-CONCENTRATION RARE EARTH SOLUTION

摘要

A method for extraction, enrichment and recovery of rare earths from a low-concentration rare earth solution, using a non-saponification organic extractant to perform centrifugal extraction, obtaining an organic phase containing rare earths and a raffinate; using an inorganic acid to perform centrifugal back-extraction on the organic phase containing rare earths, obtaining a rare earth enriched liquid. Low-concentration rare earth solution indicates a rare earth solution having REO concentration of 0.05-8g/L. Single or dual coupled centrifugal extraction is performed, at an extraction mixing time of 5-60s. The present method has simple operation, protects the environment, and has a high rare earth recovery rate.