Recovery of rare earth elements with ionic liquids
Recovery of rare earth elements with ionic liquids
复制标题
利用离子液体回收稀土元素
DOI：
10.1039/c7gc02141k
复制
发表时间：
2017-10
期刊：
影响因子：
9.8
通讯作者：
Kaiying Wang;H. Adidharma;M. Radosz;P. Wan;Xin Xu;Christopher K. Russell;Hanjing Tian;M. Fan;Jiang Yu
中科院分区：
文献类型：
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作者：
Kaiying Wang;H. Adidharma;M. Radosz;P. Wan;Xin Xu;Christopher K. Russell;Hanjing Tian;M. Fan;Jiang Yu
稀土元素 (REE) 作为现代绿色技术和其他先进技术的关键材料，需求量很大。本综述的重点是使用离子液体 (IL) 作为绿色稀释剂和萃取剂从废物中回收稀土元素，以应对稀土元素供应挑战。深入讨论了不同提取系统中的提取机制，包括纯离子液体、使用提取剂的非功能性离子液体和功能性离子液体。基于IL的提取工艺不同于传统的基于分子溶剂的提取工艺。此外，汽提对于回收离子液体至关重要，并且引入超临界二氧化碳 (Sc-CO2) 以从离子液体相中回收 REE 复合物。此外，Sc-CO2 可以通过增强传质来加速整个萃取过程。面临的挑战是了解 IL/Sc-CO2 系统的提取机制，以促进废物中稀土元素的绿色回收。
Rare earth elements (REEs) are in high demand as critical materials in modern green and other advanced technologies. This review focuses on the recovery of REEs from waste with ionic liquids (ILs) as green dilutants and extractants to tackle the REE supply challenge. Extraction mechanisms in different extraction systems, including pure ILs, non-functional ILs with extractants, and functional ILs, are discussed in depth. The IL-based extraction process is different from the traditional molecular solvent-based extraction process. In addition, stripping is crucial to recovering ILs, and supercritical CO2 (Sc-CO2) is introduced to recover REE complexes from the IL phase. Also, Sc-CO2 can accelerate the whole extraction process by enhancing mass transfer. The challenge is to understand the extraction mechanism of the IL/Sc-CO2 system to advance the green recovery of REEs from waste.