Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.4
2.9
Journals
Metals
Special Issues
Metal Recovery from Secondary Resources
share announcement

Metal Recovery from Secondary Resources

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

Deadline for manuscript submissions: closed (31 January 2023) | Viewed by 6219

Special Issue Editors

Dr. Zhe Wang

E-Mail Website
Guest Editor
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
Interests: metal recovery; secondary resources; mineral processing; pyrometallurgy; materials characterization; waste management; electrochemistry; hydrometallurgy
Special Issues, Collections and Topics in MDPI journals
Dr. Jingxiu Wang

E-Mail Website
Guest Editor
The State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Interests: hydrometallurgy; biohydrometallurgy; resources recycling; metal recovery; mineral processing; environmental remediation

Special Issue Information

Dear Colleagues,

Primary mining is inherently unsustainable and poses significant environmental risks. In the context of the huge imbalance between the increasing demand for metals and their decreasing supply from finite natural metal resources, metal recovery via sustainable and inexpensive routes from secondary resources is a significant way to reduce mining activities and their environmental impacts. Examples include mine tailing, metallurgy slags, spent catalysts, electronic wastes, and various other industrial side streams. The metals can be precious metals including gold, silver, and platinum, industrial and base metals such as copper, aluminum, steel, and zinc, rare earth metals, or other important metals.

This Special Issue is focused on the advanced methods for metal recovery from secondary resources, such as physical method, pyrometallurgy, hydrometallurgy, electrochemistry, and biohydrometallurgy techniques. Reviews and original articles in the areas of pretreatment, metal enrichment, metal purification, process optimization, industrial applications, as well as life cycle assessment, are welcomed.

Dr. Zhe Wang
Dr. Jingxiu Wang
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. 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

  • metal recovery
  • secondary resources
  • mineral processing
  • pyrometallurgy
  • materials characterization
  • waste management
  • electrochemistry
  • hydrometallurgy

Published Papers (3 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

12 pages, 17615 KiB  
Article
Kinetics of Low-Grade Scheelite Leaching with a Mixture of Sodium Phosphate and Sodium Fluoride
by Liang Yang, Chaoyang Li, Caifang Cao, Xiang Xue, Dandan Gong and Linsheng Wan
Metals 2022, 12(10), 1759; https://0-doi-org.brum.beds.ac.uk/10.3390/met12101759 - 19 Oct 2022
Viewed by 1207
Abstract
The current technology of leaching low-grade scheelite with sodium hydroxide or sodium carbonate has the disadvantages of large leaching reagent dosage and low leaching efficiency of tungsten. In order to extract scheelite efficiently, the kinetics of low-grade scheelite leaching with a mixture of [...] Read more.
The current technology of leaching low-grade scheelite with sodium hydroxide or sodium carbonate has the disadvantages of large leaching reagent dosage and low leaching efficiency of tungsten. In order to extract scheelite efficiently, the kinetics of low-grade scheelite leaching with a mixture of sodium phosphate and sodium fluoride was investigated. In this study, the effects of temperature, phosphate concentration, and fluoride ion concentration on the leaching rate of tungsten were investigated. Our results showed that the leaching rate of tungsten was greatly influenced by the temperature and less affected by the concentration of phosphate and fluorine ions. The leaching process was controlled by a chemical reaction with an apparent activation energy value of 51 ± 0.2 kJ/mol. The apparent reaction orders with respect to phosphate and fluorine ions were 0.49 and 0.11, respectively. The reaction product calcium fluorophosphate was a loose, rod-like crystal, which would not tightly wrap on the surface of scheelite to prevent the diffusion process. The leaching kinetics of low-grade scheelite was in accordance with the shrinking core model, and the corresponding kinetic equation was also established. Full article
(This article belongs to the Special Issue Metal Recovery from Secondary Resources)
►▼ Show Figures

Figure 1

12 pages, 18753 KiB  
Article
Enhanced Separation Behavior of Metals from Simulated Printed Circuit Boards by Supergravity
by Long Meng, Yudong Liu and Zhancheng Guo
Metals 2022, 12(9), 1533; https://0-doi-org.brum.beds.ac.uk/10.3390/met12091533 - 16 Sep 2022
Viewed by 1359
Abstract
Printed circuit boards (PCBs) contain valuable metals, epoxy resin, and glass fiber, resulting in them being considered as attractive secondary sources of metals. Due to the complex metal compositions in PCBs, it is difficult to clarify the mechanism of metal separation behavior in [...] Read more.
Printed circuit boards (PCBs) contain valuable metals, epoxy resin, and glass fiber, resulting in them being considered as attractive secondary sources of metals. Due to the complex metal compositions in PCBs, it is difficult to clarify the mechanism of metal separation behavior in the pyrometallurgical recovery process. In this paper, pure Pb, Sn and Cu were used to simulate the effects of temperature, time, particle size and shape on the reaction and separation process. With the increase of temperature and time, the thickness of the interface reaction layer was improved. Under the same temperature and time, the reaction degree of Cu with Sn was greater than that of Cu with Pb. In the separation process, reducing temperature, time and increasing Cu particle size were conducive to the separation and recovery of Pb-Sn alloy by supergravity. Under the same or similar particle size, the recovery of Pb-Sn alloy in irregular Cu particles was lower than that in regular Cu spheres. Improving the gravity coefficient benefited the recoveries of Pb and Sn. The results will provide technical guidance for the separation and recovery of Pb, Sn and Cu from real PCBs. Full article
(This article belongs to the Special Issue Metal Recovery from Secondary Resources)
►▼ Show Figures

Figure 1

12 pages, 1371 KiB  
Article
Microwave Digestion and ICP-MS Determination of Major and Trace Elements in Waste Sm-Co Magnets
by Natalia A. Korotkova, Vasilisa B. Baranovskaya and Kseniya V. Petrova
Metals 2022, 12(8), 1308; https://0-doi-org.brum.beds.ac.uk/10.3390/met12081308 - 4 Aug 2022
Cited by 5 | Viewed by 3052
Abstract
In this article, inductively coupled plasma mass-spectrometry (ICP-MS) and inductively coupled plasma optical-emission spectrometry (ICP-OES) were used for the development of an analytical procedure for analysis of the waste of Sm-Co magnets. Experimental parameters related to microwave digestion processes and acid concentrations were [...] Read more.
In this article, inductively coupled plasma mass-spectrometry (ICP-MS) and inductively coupled plasma optical-emission spectrometry (ICP-OES) were used for the development of an analytical procedure for analysis of the waste of Sm-Co magnets. Experimental parameters related to microwave digestion processes and acid concentrations were optimized. Microwave digestion was carried out in mixtures of HF, HCl, HNO3 and H2SO4. The complete dissolution of the samples occurred in the system: 10 mL H2O, 2 mL HNO3, 10 mL HCl and 1 mL H2SO4. The dependence of the matrix effect on the ICP-MS analysis of waste Sm-Co magnets was studied and optimal instrumental parameters were investigated (nebulizer gas flow, sampling depth and potential at the extractor lens). The optimal conditions were a nebulizer gas flow of 0.85–0.90 L/min, a sampling depth of 101, potential at the extractor lens of −400 V and a sample flow rate of 50 rpm. A recovery test and inter-method experiments were performed to verify the accuracy of the proposed method. Full article
(This article belongs to the Special Issue Metal Recovery from Secondary Resources)
►▼ Show Figures

Graphical abstract

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-3
Back to TopTop