Recovery of rare earths and lithium from rare earth molten salt electrolytic slag by lime transformation, co-leaching and stepwise precipitation

Xinglan Li, Peidi Luo, Zishuai Liu, Xuekun Tang, Baqun Zhang, Jiangfeng Guo
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Abstract

The rare earth molten salt electrolytic slag (REMSES) has recently attracted significant attention due to its potential environmental hazards and high content of rare earths and lithium, leading to a surge in recycling efforts. In this study, we propose and demonstrate a novel and straightforward process for the simultaneous extraction of rare earths and lithium from REMSES through lime transformation and sulfuric acid leaching at low temperatures. Firstly, during the lime transformation process, REMSES is converted into hydroxides that can be easily dissolved in acids. Secondly, REEs and Li present in the slag are co-extracted using a conditional sulfuric acid leaching method, resulting in 95.72% REEs leaching efficiency and 99.41% Li leaching efficiency under optimal conditions. Finally, REEs and Li in the solution are precipitated using oxalic acid and trisodium phosphate with precipitation efficiencies of 99.02% for REEs and 94.85% for Li respectively. This innovative process enables the conversion of REEs and lithium from REMSES into high-purity products (a mixture of REOs with 99.31% purity; Li3PO4 with 98.93% purity), thereby facilitating their valuable utilization.
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通过石灰转化、共浸出和逐步沉淀法从稀土熔盐电解渣中回收稀土和锂
稀土熔盐电解渣(REMSES)因其潜在的环境危害和高含量的稀土和锂,最近引起了人们的极大关注,导致回收工作激增。在本研究中,我们提出并演示了一种新颖而简单的工艺,通过石灰转化和低温硫酸浸出同时从 REMSES 中提取稀土和锂。首先,在石灰转化过程中,REMSES 被转化成氢氧化物,很容易溶解在酸中。其次,采用条件硫酸浸出法共同萃取矿渣中的 REEs 和 Li,在最佳条件下,REEs 的浸出效率为 95.72%,Li 的浸出效率为 99.41%。最后,使用草酸和磷酸三钠沉淀溶液中的 REEs 和 Li,REEs 和 Li 的沉淀效率分别为 99.02% 和 94.85%。这一创新工艺可将 REMSES 中的 REEs 和锂转化为高纯度产品(REOs 混合物,纯度为 99.31%;Li3PO4,纯度为 98.93%),从而促进了它们的宝贵利用。
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