Abstract:In this paper, the solvent extraction method is used to extract rare earths from the nitric acid solution enriched with rare earth elements lanthanum (La), neodymium (Nd), yttrium (Y), and cerium (Ce) through an organic phosphinic acid extractant. The effects of different acidity, extractant concentration, comparison, and extraction time on the extraction rate and stripping rate were investigated. According to the analysis, the optimal conditions for extraction of rare earth with diisobutylphosphinic acid were as follows: room temperature, acidity 0.2mol /l, extractant concentration 40%, comparison (A/O) is 1:5, extraction time 15min. At this time, the extraction rates of lanthanum (La), neodymium (Nd), cerium (Ce), and yttrium (Y) are: 41.68%, 81.30%, 81.29%, 100%. When stripping with HCl, the best stripping conditions are: room temperature, 0.3 mol/L of the initial aqueous rare earth solution, the stripping agent is 6 mol/L hydrochloric acid solution, the volume ratio of the loaded organic phase to the hydrochloric acid solution is 1:6, The stripping oscillation time was changed to 5min, and the stripping rates of lanthanum (La), neodymium (Nd), cerium (Ce), and yttrium (Y) were 92.45%, 94.88%, 95.76%, and 93.34%, respectively. This organic phosphinic acid has different extraction effects on rare earth elements (La), neodymium (Nd), cerium (Ce), and yttrium (Y), in which the extraction rate of yttrium is higher, and the extraction rate of lanthanum, neodymium, and cerium The effect is poor. This is an organic phosphinic acid with low affinity for light rare earth elements and strong affinity for heavy rare earth elements.