Ion-absorbed rare earth ores radioactive residues (IREORR) are a class of waste residue from the production of rare earth elements (REEs). Because of its radioactive dose, IREORR are usually stored in waste warehouses. IREORR are difficult to be disposed of. However, it contains relatively high concentrations of REEs, which can be considered as a valuable secondary resource. In this paper, a novel process is developed for the separation of thorium (Th) and recovery of REEs from IREORR hydrochloric acid leachate with primary amine N1923 and Cyanex® 572, respectively. The effects of sulfate concentration, extractant concentration and pH on N1923 extraction in hydrochloric acid solution were investigated in detail. The results show that the extraction capacity of N1923 can be improved by adding sulfate to the solution and increasing the concentration of N1923. Acidity has little effect on the extraction of Th when pH is higher than 1. As for the stripping, REEs are more easily stripped from loaded organic phase than Th, and nitric acid is a better stripping agent than hydrochloric acid. Combined with the extraction of Cyanex® 572 for REEs, a fractional extraction experiment for separating Th and enriching of REEs was performed. The yield of Th is higher than 99.9% and the concentration of REEs is enriched to 183.84 g/L.

离子吸收稀土矿放射性残留物 (IREORR) 是稀土元素 (REE) 生产过程中产生的一类废渣。由于其放射性剂量，IREORR 通常储存在废物仓库中。IREORR 很难被处理掉。然而，它含有相对高浓度的稀土元素，可被视为一种宝贵的二次资源。在本文中，开发了一种分别使用伯胺 N1923 和 Cyanex® 572 从 IREORR 盐酸浸出液中分离钍 (Th) 和回收 REE 的新工艺。详细研究了硫酸盐浓度、萃取剂浓度和pH值对N1923在盐酸溶液中萃取的影响。结果表明，在溶液中加入硫酸盐和增加N1923的浓度可以提高N1923的萃取能力。pH高于1时，酸度对Th的萃取影响不大。在汽提方面，REE比Th更容易从负载的有机相中汽提，硝酸是比盐酸更好的汽提剂。结合 Cyanex® 572 对 REE 的萃取，进行了分离 Th 和富集 REE 的分级萃取实验。Th收率高于99.9%，REEs浓度富集至183.84 g/L。结合 Cyanex® 572 对 REE 的萃取，进行了分离 Th 和富集 REE 的分级萃取实验。Th收率高于99.9%，REEs浓度富集至183.84 g/L。结合 Cyanex® 572 对 REE 的萃取，进行了分离 Th 和富集 REE 的分级萃取实验。Th收率高于99.9%，REEs浓度富集至183.84 g/L。