Abstract
Solvent extraction is the most widely used method for separation and purification of rare earth elements, and organic extractants such as di(2-ethylhexyl) phosphoric acid (P204) and di(1-methyl-heptyl) methyl phosphonate (P350) are most commonly used for industrial applications. However, the presence of impurity ions in the feed liquid during extraction can easily emulsify the extractant and affect the quality of rare earth products. Aluminum ion is the most common impurity ion in the feed liquid, and it is an important cause of emulsification of the extractant. In this study, the influence of aluminum ion was investigated on the extraction of light rare earth elements by the P204-P350 system in hydrochloric acid medium. The results show that Al3+ competes with light rare earths in the extraction process, reducing the overall extraction rate. In addition, the Al3+ stripping rate is low and there is continuous accumulation of Al3+ in the organic phase during the stripping process, affecting the extraction efficiency and even causing emulsification. The slope method and infrared detection were utilized to explore the formation of an extraction compound of Al3+ and the extractant P204-P350 that entered the organic phase as AlCl[(HA)2]2P350(o).
Highlights
Minerals 2021, 11, 61. https://Rare earth elements include the lanthanides in the periodic table as well as scandium (Sc) and yttrium (Y) [1,2]
Solvent extraction is most widely used in the separation of REEs because it is considered more effective, lower cost and easier to implement than other separation techniques, and the use of selective organic solvents such as di(2-ethylhexyl) phosphoric acid(P204) and
This study systematically examined the effect of Al3+ on the P204-P350 system for the extraction and stripping of light rare earths and explored the combination mechanism of P204-P350 and Al3+
Summary
Rare earth elements include the lanthanides in the periodic table as well as scandium (Sc) and yttrium (Y) [1,2]. The leaching solution of rare earth ions contains many impurity ions such as Al3+ , Ca2+ , Fe3+ , and Mg2+ , and the presence of these ions significantly impact the subsequent extraction and separation process [22]. In addition to rare earth minerals, the clay in this location contains a large amount of impurity ions such as Al3+ and Ca2+ Leachate prepared at this site would contain a large amount of impurity ions and rare earth ions, which will have a significant impact on the subsequent extraction and separation process. For this newly discovered ionic rare earth ore, studies have focused on the extraction and separation process of the. This study systematically examined the effect of Al3+ on the P204-P350 system for the extraction and stripping of light rare earths and explored the combination mechanism of P204-P350 and Al3+
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