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Journals
Separations
Special Issues
Solid Waste Recycling and Strategic Metal Extraction
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Solid Waste Recycling and Strategic Metal Extraction

A special issue of Separations (ISSN 2297-8739). This special issue belongs to the section "Separation Engineering".

Deadline for manuscript submissions: 20 October 2025 | Viewed by 1229

Special Issue Editors

Dr. Lihui Gao

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Guest Editor
School of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
Interests: extraction of strategic metal resources; adsorption; wastewater treatment
Special Issues, Collections and Topics in MDPI journals
Dr. Daoguang Teng

E-Mail Website
Guest Editor
1. Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, China
2. School of Chemical Engineering, Zhengzhou University, Zhengzhou, China
3. The Key Lab of Critical Metals Minerals Supernormal Enrichment and Extraction, Ministry of Education, Zhengzhou, China
Interests: enrichment and extraction of critical rare metals; utilization of coal-based solid waste/secondary metallurgical resources/urban mining resources; intensification of separation processes
Special Issues, Collections and Topics in MDPI journals
Dr. Shulei Li

E-Mail Website
Guest Editor
National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, China
Interests: utilization of solid waste resources; wastewater treatment; separation; flotation
Special Issues, Collections and Topics in MDPI journals
Dr. Chunlin He

E-Mail Website
Guest Editor
School of Resources, Environment and Materials, Guangxi University, Nanning, China
Interests: adsorbent material; enrichment and extraction of key metals

Special Issue Information

Dear Colleagues,

This Special Issue of Separations delves into advanced separation technologies for the valorization of solid waste and the enrichment of rare earth elements (REEs). This Special Issue invites contributors to submit innovative research, review articles, and case studies that highlight a comprehensive array of methodologies, including, but not limited to, the value-added utilization of biomass, synthesis of adsorption materials, and efficient enrichment and extraction of REEs. The focus of this Special Issue is on developing processes that are efficient, environmentally friendly, and economically viable to achieve resource recovery from solid waste and meet the growing demand for REEs.

Dr. Lihui Gao
Dr. Daoguang Teng
Dr. Shulei Li
Dr. Chunlin He
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Separations is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • solid waste
  • biomass
  • adsorption material
  • wastewater treatment
  • strategic metal resources

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (2 papers)

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Review

26 pages, 7085 KiB  
Review
Advances in Electrolytic Manganese Residue: Harmless Treatment and Comprehensive Utilization
by Weijian Yu, Xiaoya Li, Wenting Xu, Qingjun Guan, Fujia Zhou, Jiani Zhang, Li Wang, Yanxiu Wang and Honghu Tang
Separations 2025, 12(7), 180; https://doi.org/10.3390/separations12070180 - 7 Jul 2025
Viewed by 286
Abstract
Electrolytic manganese residue (EMR) is a byproduct of electrolytic manganese production, rich in soluble pollutants such as manganese and ammonia nitrogen. Traditional stockpiling methods result in contaminant leaching and water pollution, threatening ecosystems. Meanwhile, EMR has significant resource-recovery potential. This paper systematically reviews [...] Read more.
Electrolytic manganese residue (EMR) is a byproduct of electrolytic manganese production, rich in soluble pollutants such as manganese and ammonia nitrogen. Traditional stockpiling methods result in contaminant leaching and water pollution, threatening ecosystems. Meanwhile, EMR has significant resource-recovery potential. This paper systematically reviews the harmless process and resource technology of EMR, efficiency bottlenecks, and the current status of industrial applications. The mechanisms of chemical leaching, precipitation, solidification, roasting, electrochemistry, and microorganisms were analyzed. Among these, electrochemical purification stands out for its efficiency and environmental benefits, positioning it as a promising option for broad industrial use. The mechanisms of chemical leaching, precipitation, solidification, roasting, electrochemistry, and microorganisms were analyzed, revealing the complementarity between building materials and chemical materials (microcrystalline glass) in scale and high-value-added production. But the lack of impurity separation accuracy and market standards restricts its promotion. Finally, it proposes future directions for EMR resource utilization based on practical and economic considerations. Full article
(This article belongs to the Special Issue Solid Waste Recycling and Strategic Metal Extraction)
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26 pages, 948 KiB  
Review
Antimony Recovery from Industrial Residues—Emphasis on Leaching: A Review
by Marinela Panayotova, Serhii Pysmennyi and Vladko Panayotov
Separations 2025, 12(6), 156; https://doi.org/10.3390/separations12060156 - 8 Jun 2025
Viewed by 739
Abstract
Antimony (Sb) is a metalloid widely used in different areas—from the cutting-edge renewable energy technologies to “classical” lead acid batteries. Its availability in primary sources is limited, and these sources are geographically unevenly distributed worldwide. Antimony use will increase in the future. That [...] Read more.
Antimony (Sb) is a metalloid widely used in different areas—from the cutting-edge renewable energy technologies to “classical” lead acid batteries. Its availability in primary sources is limited, and these sources are geographically unevenly distributed worldwide. Antimony use will increase in the future. That is why Sb is included in the critical raw material lists of the European Union and the USA. In order to mitigate the future Sb shortage, Sb recovery from industrial residues is worth considering. This paper presents the availability of Sb in nonferrous metals extraction waste and the applicability of the hydrometallurgical route for Sb recovery from such sources. Leaching is emphasized. The use of acidic and alkaline leaching methods, their recent modifications, and the effect of different process parameters (reagents’ type, solid-to-liquid ratio, temperature, and the addition of oxidizing reagents) are highlighted. The use of new leaching systems, such as deep eutectic solvents and non-aqueous solutions, is presented. Initial attempts to apply bioleaching are described. Finally, some proposals for future investigations are given. Full article
(This article belongs to the Special Issue Solid Waste Recycling and Strategic Metal Extraction)
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