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Extraction: Advanced Methods

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...

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Rare earth elements from waste.

Bing Deng¹, Xin Wang², Duy Xuan Luong¹

¹Department of Chemistry, Rice University, Houston, TX 77005, USA.

Science Advances

|February 9, 2022

Summary

This summary is machine-generated.

Flash Joule heating (FJH) offers a rapid, energy-efficient method to activate waste materials for rare earth element (REE) recovery. This process significantly enhances REE extractability from diverse waste streams, supporting a circular economy.

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Area of Science:

Materials Science
Chemical Engineering
Environmental Science

Background:

Rare earth elements (REEs) are vital for modern technologies.
Traditional REE mining faces resource depletion and environmental concerns.
Current REE recovery methods from waste are inefficient, costly, and generate significant wastewater.

Purpose of the Study:

To develop an ultrafast and energy-efficient process for enhanced rare earth element recovery from waste.
To improve the extractability of REEs from challenging waste matrices.
To demonstrate the feasibility of the proposed method for various industrial wastes.

Main Methods:

Utilized flash Joule heating (FJH) for ultrafast electrothermal activation of waste materials (~3000°C, ~1 s).
Applied FJH to degrade or reduce refractory REE species into more soluble forms.
Investigated REE recovery using diluted acid leaching (e.g., 0.1 M HCl) post-FJH treatment.

Main Results:

Achieved approximately a 2x increase in rare earth element leachability.
Demonstrated high recovery yields of REEs from diverse wastes like coal fly ash, bauxite residue, and electronic waste.
The FJH process exhibited energy efficiency with consumption as low as 600 kWh ton⁻¹.

Conclusions:

Flash Joule heating is a promising activation strategy for efficient rare earth element recovery from various waste sources.
This ultrafast, energy-efficient method offers a viable route toward a circular economy for critical materials.
The process shows potential for rapid scalability and integration into existing waste management infrastructures.