New Trends in Sustainable Extraction of Energy-Critical Minerals

A special issue of Eng (ISSN 2673-4117).

Deadline for manuscript submissions: 1 December 2026 | Viewed by 1116

Special Issue Editor


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Guest Editor
Sustainable Minerals, Metals, and Materials (S3M), Department of Earth and Environmental Engineering, Fu Foundation School of Engineering and Applied Science, Columbia University, New York, NY, USA
Interests: extractive metallurgy; flotation; rare earth elements; lithium; hydrometallurgy

Special Issue Information

Dear Colleagues,

The global transition to clean energy technologies has intensified the demand for energy-critical minerals, essential for renewable energy systems, energy storage, and advanced electronics. However, conventional extractive metallurgy and mineral processing methods are often energy-intensive, costly, and of environmental concern. These methods are generally not circular and, consequently, are unsustainable in the long term. This Special Issue, New Trends in Sustainable Extraction of Energy-Critical Minerals’, aims to highlight innovative approaches that enhance the efficiency, selectivity, and environmental performance of energy-critical mineral extraction and processing. Key topics include, but are not limited to, advancements in hydrometallurgy, novel ligands for solvent extraction and saponification, bio-based extraction techniques, ionic liquid and deep eutectic solvent applications, and electrochemical- and membrane-based separations. Additionally, this Special Issue will explore circular economy strategies, including recycling, urban mining, and closed-loop processing, as well as the role of machine learning and process modeling in optimizing extraction techniques. Contributions focusing on low-waste, low-carbon, and socially responsible extraction pathways are especially encouraged. By bringing together cutting-edge research from academia and industry, this Special Issue aims to accelerate the adoption of sustainable extraction methods that support the secure and responsible supply of energy-critical minerals. Researchers, engineers, and scientists are invited to contribute original studies and reviews that shape the future of sustainable extractive metallurgy.

Dr. Behzad Vaziri Hassas
Guest Editor

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Keywords

  • energy-critical minerals
  • critical elements separation
  • novel ligands
  • solvent extraction
  • saponification
  • ionic liquid
  • deep eutectic solvents

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Published Papers (1 paper)

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Research

19 pages, 1547 KB  
Article
Kinetics of Heavy Rare Earth Element Extraction from Phosphoric Acid Solutions
by Olga Cheremisina, Elena Lukyantseva and Vasiliy Sergeev
Eng 2026, 7(2), 58; https://doi.org/10.3390/eng7020058 - 27 Jan 2026
Viewed by 594
Abstract
Rare earth elements are indispensable for a wide range of advanced technologies, which underscores their strategic importance. This study investigates the kinetics of extracting heavy rare earth elements—lutetium, thulium, yttrium, erbium, and dysprosium—from industrial phosphoric acid solutions generated during apatite processing. A comparative [...] Read more.
Rare earth elements are indispensable for a wide range of advanced technologies, which underscores their strategic importance. This study investigates the kinetics of extracting heavy rare earth elements—lutetium, thulium, yttrium, erbium, and dysprosium—from industrial phosphoric acid solutions generated during apatite processing. A comparative approach using both solvent and solid-phase extraction with di-(2-ethylhexyl)phosphoric acid (D2EHPA) was applied to elucidate the underlying mechanisms. Optimal solvent extraction parameters (Vaq:Vorg = 2:1, φD2EHPA = 0.2, 298 K, stirring at 350 rpm) achieved efficiencies exceeding 85%. Efficient solid-phase recovery was attained under mild conditions (298 K, m:V = 1:10, shaking at 100 opm). The rate-limiting steps were identified as diffusion-controlled for solvent extraction, governed primarily by agitation intensity, and as a mixed external–internal diffusion regime for solid-phase extraction. Calculated activation energies for each element corroborate these findings. Full article
(This article belongs to the Special Issue New Trends in Sustainable Extraction of Energy-Critical Minerals)
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