METHOD FOR EXTRACTION, ENRICHMENT AND RECOVERY OF RARE LANDS FROM LOW RARE GROUND CONCENTRATION SOLUTION

摘要

extraction method, rare earth enrichment and recovery from low rare earth concentration solution is a method for extraction, rare earth enrichment and recovery from a low concentration rare earth solution, using a non-saponification organic extractor to perform centrifugal extraction, obtaining an organic phase containing rare earths and a refined one; using an inorganic acid to perform centrifugal extraction in the rare earth-containing organic phase,obtaining a rare earth enriched liquid. low concentration rare earth solution indicates a rare earth solution with an aerial concentration of 0.05 to 8 g / l. single or double coupling centrifugal extraction is performed according to the actual concentration of the rare earth solution, allowing all rare earths or light rare earths and medium-heavy rare earths to be enriched respectively in the organic phase containing rare earths, and then, centrifugal reextraction is performed through inorganic acid, thus obtaining the rare earth enriched liquid containing all rare earths or containing mainly light rare earths or medium-heavy rare earths. The present method has simple operation, protects the environment, has a high rare earth recovery rate and is low in recovery cost.