Supercritical carbon dioxide/nitrogen/air extraction with multistage stripping enables selective recovery of rare earth elements from coal fly ashes

被引:4
|
作者
Zhu, Yaguang [1 ,2 ]
Wang, Guangcheng [1 ,3 ]
Jun, Young-Shin [1 ]
机构
[1] Washington Univ St Louis, Dept Energy Environm & Chem Engn, St. Louis, MO 63130 USA
[2] Princeton Univ, Andlinger Ctr Energy & Environm, Princeton, NJ 08540 USA
[3] Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 117585, Singapore
来源
RSC SUSTAINABILITY | 2023年 / 1卷 / 02期
关键词
FLUID EXTRACTION; TRIBUTYL-PHOSPHATE; ACID; DIOXIDE; PHOSPHORUS; KINGSTON; IMPACTS; OXIDES; SPILL;
D O I
10.1039/d2su00033d
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Rare earth elements (REEs) are widely used in electronic devices and renewable energy technology, but their supply is geopolitically-limited and they are extracted by environmentally unsustainable mining practices. Coal fly ash (CFA), which is mostly discarded as waste, has recently gained attention as a potential low-grade REE source, motivating the development of greener and highly specific processes for recovering and enriching REEs. Here we present a proof-of-concept for a novel REE extraction process in which supercritical fluid enhances the ability of tributyl phosphate (TBP) to selectively extract REEs directly from solid CFA matrices. For the first time, we show that supercritical nitrogen and supercritical air can work like supercritical carbon dioxide for selective extraction. Moreover, using a prototype multistage stripping process with an aqueous solution, we collected REEs with concentrations up to 21.4 mg L-1 from the extractant. Our final products contain up to 6.47% REEs, whereas the coal fly ash source initially contained only 0.0234% REEs. Using supercritical fluid, our novel process can recover valuable and critical resources from materials previously considered to be waste. Using supercritical fluids, our novel process selectively extracts rare earth elements from coal fly ashes that were previously considered as waste and an environmental threat.
引用
收藏
页码:251 / 260
页数:11
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