Study on the Effect and Mechanism of Impurity Aluminum on the Solvent Extraction of Rare Earth Elements (Nd, Pr, La) by P204-P350 in Chloride Solution

Solvent extraction is the most widely used method for separation and purification of rare earth elements, organic extractants such as di(2-ethylhexyl) phosphoric acid (P204) di(1-methyl-heptyl) methyl phosphonate (P350) are commonly industrial applications. However, presence impurity ions in feed liquid during can easily emulsify extractant affect quality products. Aluminum ion common liquid, it an important cause emulsification extractant. In this study, influence aluminum was investigated on light elements by P204-P350 system hydrochloric medium. The results show that Al3+ competes with earths process, reducing overall rate. addition, stripping rate low there continuous accumulation phase affecting efficiency even causing emulsification. slope infrared detection were utilized to explore formation compound entered AlCl[(HA)2]2P350(o).