Sustainable Metal Recovery from Electrorefining Byproducts
Summary
Electrorefining byproducts, notably copper anode slimes, represent a concentrated reservoir of both precious and critical metals including gold, silver, selenium, tellurium and rare earth elements. Sustainable recovery strategies have evolved to integrate hydrometallurgical, pyrometallurgical and bio-hydrometallurgical routes into hybrid processes that aim to maximise extraction efficiency while minimising energy use, chemical consumption and waste generation. Recent advances in microscopic and spectroscopic characterisation techniques have deepened understanding of phase distributions and impurity deportment, enabling process intensification and improved resource circularity. Coupling life cycle assessment with green chemistry principles guides the selection of low-impact pathways and supports the development of scalable, cost-effective recovery circuits. These efforts contribute to securing metal supply chains, reducing environmental footprint and advancing the circular economy on a global scale.
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Sustainable Metal Recovery from Electrorefining Byproducts publication trend
The graph below shows the total number of articles in sustainable metal recovery from electrorefining byproducts across all publications each year (not limited to Nature Index journals).
Technical terms
Electrorefining: An electrolytic process that purifies metals by oxidising and reducing them within an electrolyte to produce high-purity cathode metal and impure anode slimes.
Copper anode slime: A complex metallic residue enriched in precious and critical elements formed on the anode during copper electrorefining.
Hydrometallurgy: A set of aqueous-chemistry methods for leaching and extracting metals from ores or byproducts using solvents and reagents.
Pyrometallurgy: High-temperature metallurgical techniques for smelting or roasting byproducts to concentrate and recover metal values.
Life cycle assessment: A systematic method to evaluate environmental impacts associated with all stages of a product’s life, from extraction through processing to disposal.
References
- Comparative environmental impacts analysis of technologies for recovering critical metals from copper anode slime: Insights from LCA. Environmental Chemistry and Ecotoxicology (2025).
- Vacuum Gasification-Directional Condensation for Separation of Tellurium from Lead Anode Slime. Metals (2021).
- Detailed characterisation of precious metals and critical elements in anode slimes from the Olympic Dam copper refinery, South Australia. Minerals Engineering (2024).
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