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Metals
Special Issues
Metal Recovery and Separation from Scraps and Wastes
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Metal Recovery and Separation from Scraps and Wastes

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Extractive Metallurgy".

Deadline for manuscript submissions: 31 August 2025 | Viewed by 3618

Special Issue Editor

Prof. Dr. Wenning Mu

E-Mail Website
Guest Editor
School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China
Interests: extraction and separation of non-ferrous metals; high-value material utilization of secondary resources; recycling of waste battery materials; photocatalysis; capacitor material preparation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the rapid development of the economy, the discharge of scrap and waste is increasing, and the environmental problems brought on by it are becoming increasingly more serious. Scrap and waste contain many important, strategic, non-ferrous metals and are important resources for metal smelting. At present, the recovery of valuable metals from solid waste is still in the initial stages of research, and the development of green, efficient, and comprehensive utilization technology for scrap and waste resources has important scientific significance.

Prof. Dr. Wenning Mu
Guest Editor

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. Metals 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

  • recovery
  • extraction
  • separation
  • secondary resources
  • waste
  • scrap
  • hydrometallurgy
  • pyrometallurgy

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Published Papers (2 papers)

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Research

16 pages, 10634 KiB  
Article
Glass—Mill Scale—Plastics Wastes Upcycling for Synthesis of Ferrosilicon Alloy at 1550 °C: Implication for Zero Wastes Practice
by Somyote Kongkarat, Sitichoke Amnuanpol and Praphaphan Wongsawan
Metals 2024, 14(7), 784; https://doi.org/10.3390/met14070784 - 4 Jul 2024
Viewed by 1551
Abstract
Driven by the rising demand for glass, metals, and plastics in industrial and household sectors, there was a substantial increase in waste and by-products generated. This study presents a method for repurposing waste glass, mill scale, and plastics as raw materials for ferrosilicon [...] Read more.
Driven by the rising demand for glass, metals, and plastics in industrial and household sectors, there was a substantial increase in waste and by-products generated. This study presents a method for repurposing waste glass, mill scale, and plastics as raw materials for ferrosilicon alloy production. This process entails reducing SiO2 and Fe2O3 using carbon derived from polystyrene/polypropylene mixtures. The glass, scale, and carbon powders were blended to achieve a C/O molar ratio of 1 (Blends A to F). The thoroughly mixed samples were then shaped into pellets and subsequently heated at 1550 °C in a tube furnace for 60 min. Ferrosilicon was successfully synthesized, with the reaction generating numerous metal droplets along with a slag layer in the crucible. The metallic yield for Blends A to F ranged from 16.65 wt% to 21.39 wt%, with the highest yield observed in Blend D. The bulk metal primarily consists of the FeSi phase, with Blend D exhibiting the highest Si concentration of 13.51 wt% and the highest hardness of 649.55 HV. Mechanism steps for ferrosilicon formation may vary with carbon dissolution rates. This work supports fossil fuel reduction and carbon neutrality, benefiting zero wastes practice and promoting sustainable material processing. Full article
(This article belongs to the Special Issue Metal Recovery and Separation from Scraps and Wastes)
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14 pages, 14586 KiB  
Article
Sustainable Recovery of Silver and Copper Photovoltaic Metals from Waste-Conductive Silver Pastes Using Thiosulfate Extraction and Ultraviolet Photolysis
by Qing Tao, Chao Han, Qiankun Jing and Guangxin Wang
Metals 2024, 14(6), 730; https://doi.org/10.3390/met14060730 - 20 Jun 2024
Cited by 2 | Viewed by 1686
Abstract
Waste-conductive silver pastes are considered an important secondary resource. The recovery of metals from waste-conductive silver pastes have high economic value. The traditional cyanidation method has serious environmental pollution, while the thiosulfate method is green, environmentally friendly, and has become a viable alternative [...] Read more.
Waste-conductive silver pastes are considered an important secondary resource. The recovery of metals from waste-conductive silver pastes have high economic value. The traditional cyanidation method has serious environmental pollution, while the thiosulfate method is green, environmentally friendly, and has become a viable alternative for metal extraction. The exposure of thiosulfate complexes to ultraviolet (UV) light has been found to generate metal sulfides, and this can be used to realize the recovery of valuable metals. In this study, the extraction of silver and copper from conductive silver pastes was systematically performed using sodium thiosulfate, and the effects of sodium thiosulfate concentration, solid-to-liquid ratio, and extraction and photolytic process temperatures were investigated. The photolytic products were characterized using X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. After 4 h of UV irradiation with a wavelength of 254 nm, 87% of silver and 49% of copper were recovered and transformed into silver and copper sulfide, respectively. This study demonstrates that thiosulfate can be applied in combination with UV photolysis technology to recover valuable metals in an environmentally friendly manner. Full article
(This article belongs to the Special Issue Metal Recovery and Separation from Scraps and Wastes)
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