Greenhouse Gas Emissions from Molten Fluoride Electrolysis Composed of Raw and Magnet Recycling Derived Oxides: A Comparative Study

Materials, Journal Year: 2025, Volume and Issue: 18(1), P. 184 - 184

Published: Jan. 4, 2025

In situ measurements of the chemical identity and quantity anode gases during electrochemical rare earth (RE) electrolysis from fluoride-based molten salts composed different kinds oxides (REOs) were performed using FTIR spectrometry. Linear sweep voltammetry (LSV) was carried out to characterize oxidation processes determine anodic effect NdF3 + PrF3 LiF REO melt. RE complex formation subsequent reactions on GC surface discussed understand pathways CO/CO2 perfluorocarbon (PFC), mainly CF4 C2F6. The LSV shows that increasing content 1 wt.% up 4 in system, leads a positive shift critical potential for full effect, recorded around 4.50 V vs. W with REO. results on-line off-gas analysis indicate gas products CO CO2, whereas can be detected before C2F6 at after this phenomenon. Compositions off-gases REOs compared. main component found as raw materials, while magnet recycling derived (MRDOs), CO2 slightly higher compared CO. PFC emissions generally similar: periodically, but negligible concentrations, not detected.

Language: Английский

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Sustainable recovery of rare Earth elements from industrial waste: A path to circular economy and environmental health

Waste Management Bulletin, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

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Investigation on the Recovery of Rare Earth Fluorides from Spent Rare Earth Molten Electrolytic Slag by Vacuum Distillation

Materials, Journal Year: 2025, Volume and Issue: 18(7), P. 1538 - 1538

Published: March 28, 2025

Spent rare earth molten salt electrolytic slag (REMES) needs to be recovered not only because of its economic value elements (REEs), lithium, and fluorine, but also for the environmental benefits. Vacuum distillation has many advantages, such as a short process less wastewater. Aiming find an environmentally friendly method recover REEs, this research studied challenges in recovering REMES by vacuum solutions handle these obstacles. Distillation experiments raw material were initially implemented XRD, XPS, DSC, SEM methods used investigate phase changes REMES, thus discovering that oxide impurities could transform REF3 into REOF, which significantly affected REEs recovery. Only 42.04% evaporated at 1573 K 0.1 Pa 4 h with 99.99% LiF. To tackle issue, fluorination pretreatment was proposed. NH4HF2 utilized impurities, RE2O3, REOF fluorides almost no waste gas released, improving recovery efficiency 86.23%. Therefore, paper proposes fluorination–vacuum method, from efficiently wastewater or released.

Language: Английский

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Preparation of Zeolite A from Ion-Adsorbing Rare Earth Tailings for Selective Adsorption of Pb2+: An Innovative Approach to Waste Valorization

Molecules, Journal Year: 2024, Volume and Issue: 29(21), P. 5065 - 5065

Published: Oct. 26, 2024

Ion-adsorbing rare earth tailings (IRETs) contain a large amount of clay minerals, which are potential source silicon and aluminum for the preparation zeolite materials. The complexity tailings' composition impurity main difficulties in controllable zeolite. Herein, IRETs were treated by classification activation technology IRET-ZEO, was used removal heavy metal Pb

Language: Английский

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