铝土矿
稀土
废物管理
电子废弃物
环境科学
粉煤灰
煤
资源回收
材料科学
废水
冶金
环境工程
工程类
作者
Bing Deng,Zhe Wang,Duy Xuan Luong,Robert A. Carter,Zhe Wang,Mason B. Tomson,James M. Tour
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2022-02-11
卷期号:8 (6)
被引量:62
标识
DOI:10.1126/sciadv.abm3132
摘要
Rare earth elements (REEs) are critical materials in electronics and clean technologies. With the diminishing of easily accessible minerals for mining, the REE recovery from waste is an alternative toward a circular economy. Present methods for REE recovery suffer from lengthy purifications, low extractability, and high wastewater streams. Here, we report an ultrafast electrothermal process (~3000°C, ~1 s) based on flash Joule heating (FJH) for activating wastes to improve REE extractability. FJH thermally degrades or reduces the hard-to-dissolve REE species to components with high thermodynamic solubility, leading to ~2× increase in leachability and high recovery yields using diluted acid (e.g., 0.1 M HCl). The activation strategy is feasible for various wastes including coal fly ash, bauxite residue, and electronic waste. The rapid FJH process is energy-efficient with a low electrical energy consumption of 600 kWh ton-1. The potential for this route to be rapidly scaled is outlined.
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