Research progress of rare earth separation methods and technologies

Traore, Mory; Gong, Aijun; Wang, Yiwen; Qiu, Lina; Bai, Yuzhen; Zhao, Weiliang; Liu, Yang; Chen, Yi; Liu, Ying; Wu, Huilin; Li, Shuli; You, Yueyi

doi:10.1016/j.jre.2022.04.009

Cited by 75 publications

(37 citation statements)

References 90 publications

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“…Due to their distinctive electronic structure, rare earth elements possess optical, electrical, and magnetic capabilities not seen in other elements. 32 As 'contemporary industrial vitamins', rare earths and their derivatives are widely utilized in traditional materials and emerging industries. 33 2.2.1 Traditional elds.…”

Section: Typical Applications Eldsmentioning

confidence: 99%

Sustainability applications of rare earths from metallurgy, magnetism, catalysis, luminescence to future electrochemical pseudocapacitance energy storage

et al. 2023

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Section: Typical Applications Eldsmentioning

confidence: 99%

Sustainability applications of rare earths from metallurgy, magnetism, catalysis, luminescence to future electrochemical pseudocapacitance energy storage

et al. 2023

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“…Rare earth separation is important for their collection and utilization and for separating different types of rare earth elements. Various solvent extraction methods have been developed for purification and separation [7][8][9] . However, to purify rare earth elements by solvent extraction, numerous separation stages are needed, along with a mixer and settler, requiring a relatively long operation time and high cost 10 .…”

Section: Introductionmentioning

confidence: 99%

Novel rare earth separation using magnetic susceptibility difference

Chen

et al. 2023

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Rare earths are essential for manufacturing permanent magnets, widely used in various renewable energy applications, light-emitting diodes, and catalysts for reducing CO2 emissions. Rare earth minerals are distributed worldwide, but mining sites are limited. Recovering rare earth metals from minerals and recycling wastes causes environmental burdens and energy consumption. However, there is no other separation method except for solvent extraction. Here, we developed the simple rare earth separation method using magnetic susceptibility difference by controlling liquid magnetization with ferrofluid and paramagnetic liquid, after preparation of liberated rare earth particles mixture. Conventional magnetic separation could capture all paramagnetic particles as magnetic materials. We investigated particle capture to prevent magnetic levitation and different direction capture. To compare solvent extraction, the rare earth mixture groups in the separation factor of magnetic separation larger than the solvent extraction were Ce-La, Pr-Ce, Eu-Sm, Gd-Eu, Dy-Tb, Tm-Er, and Lu-Yb mixtures. This novel separation method would increase the unused, rare earth resources.

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“…The leaching reagents were widely used in the process of rare earth element leaching ( Traore et al, 2022 ). So numerous studies focused on the screening and application of leaching reagents in the process of rare earth element leaching from the REM ( Talan and Huang, 2022 ; Zhou et al, 2022 ), but a large amount of leaching reagents not only affected soil quality but also increased ecological risk for rare earth ores after closure ( Mokoena et al, 2022 ).…”

Section: Introductionmentioning

confidence: 99%

Insights into remediation effects and bacterial diversity of different remediation measures in rare earth mine soil with SO42− and heavy metals

et al. 2023

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The increased demand for rare earth resources has led to an increase in the development of rare earth mines (REMs). However, the production of high-concentration leaching agents (SO42−) and heavy metals as a result of rare earth mining has increased, necessitating the removal of contaminants. Here, a series of experiments with different remediation measures, including control (CK), sulfate-reducing bacteria (SRB) alone (M), chemicals (Ca(OH)2, 1.5 g/kg) plus SRB (CM-L), chemicals (Ca(OH)2, 3.0 g/kg) plus SRB (CM-M), and chemicals (Ca(OH)2, 4.5 g/kg) plus SRB (CM-H), were conducted to investigate the removal effect of SO42−, Pb, Zn, and Mn from the REM soil. Then, a high-throughput sequencing technology was applied to explore the response of bacterial community diversity and functions with different remediation measures. The results indicated that CM-M treatment had a more efficient removal effect for SO42−, Pb, Zn, and Mn than the others, up to 94.6, 88.3, 98.7, and 91%, respectively. Soil bacterial abundance and diversity were significantly affected by treatments with the inoculation of SRB in comparison with CK. The relative abundance of Desulfobacterota with the ability to transform SO42− into S2− increased significantly in all treatments, except for CK. There was a strong correlation between environmental factors (pH, Eh, SO42−, Pb, and Zn) and bacterial community structure. Furthermore, functional prediction analysis revealed that the SRB inoculation treatments significantly increased the abundance of sulfate respiration, sulfite respiration, and nitrogen fixation, while decreasing the abundance of manganese oxidation, dark hydrogen oxidation, and denitrification. This provides good evidence for us to understand the difference in removal efficiency, bacterial community structure, and function by different remediation measures that help select a more efficient and sustainable method to remediate contaminants in the REM soil.

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Research progress of rare earth separation methods and technologies

Cited by 75 publications

References 90 publications

Sustainability applications of rare earths from metallurgy, magnetism, catalysis, luminescence to future electrochemical pseudocapacitance energy storage

Sustainability applications of rare earths from metallurgy, magnetism, catalysis, luminescence to future electrochemical pseudocapacitance energy storage

Novel rare earth separation using magnetic susceptibility difference

Insights into remediation effects and bacterial diversity of different remediation measures in rare earth mine soil with SO42− and heavy metals

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