Rare earth elements from waste [electronic resource]

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 553.495 Platinum metals

Thông tin xuất bản: Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2022

Mô tả vật lý: Size: Article No. eabm3132 : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 267671

 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<
 sup>
 ?1<
 /sup>
 . The potential for this route to be rapidly scaled is outlined.
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