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氟碳铈矿是最主要的稀土来源,而氟是制约稀土清洁化分离的瓶颈,因此在提取稀土前进行氟的分离是一种解决方案。利用氟铝间很强的配位性质,加入铝盐而发生竞争配位反应,使[CeF2]2+变为游离Ce4+后向萃取相转移,实现氟-铈分离。实验结果表明:[H+]≤1.0mol.L-1,以Al2(SO4)3或NaAlO2为氟络合剂,根据酸浸中F-含量,向浸出液中加入n(F)/n(Al)=1的Al2(SO4)3或n(F)/n(Al)=1.5的NaAlO2时,氟-铈分离效果最好。
Bastnasite is the most important source of rare earths, and fluorine is the bottleneck restricting the clean separation of rare earths. Therefore, fluorine separation before rare earth extraction is a solution. Utilizing the strong coordination property between fluoroalumina and aluminum salt, the competitive coordination reaction takes place, and the [CeF2] 2+ becomes free Ce4 +, and then the phase transfer is carried out to achieve the fluorine-cerium separation. The experimental results show that when n (F) / n (Al) is added to the leachate according to the content of F- in acid leaching, [H +] ≤1.0mol.L- = 1 Al2 (SO4) 3 or n (F) / n (Al) = 1.5 NaAlO2, the best separation of fluorine-cerium.