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Metals
Special Issues
Advances in Valuable Metal Recycling
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Advances in Valuable Metal Recycling

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

Deadline for manuscript submissions: closed (28 February 2021) | Viewed by 4455

Special Issue Editors

Dr. Jae-Chun Lee

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Guest Editor
1. Resources Recycling, Korea University of Science and Technology, Daejeon 34113, Republic of Korea
2. Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Republic of Korea
Interests: leaching, separation, and purification of metals from primary and secondary resources; material preparation by aqueous processing; recycling of valuable metals from industrial waste and waste electric and electronic equipment (WEEE) by hydrometallurgical routes
Special Issues, Collections and Topics in MDPI journals
Dr. Jungshin Kang

E-Mail Website
Guest Editor
Korea Institute of Geoscience and Mineral Resources (KIGAM), A1-316, 124 Gwahak-ro, Yuseong-gu, 34132 Daejoen, South Korea
Interests: recovery of rare metals from primary and secondary resources using pyrometallurgical methods; chlorination, metallothermic reduction, molten salt electrolysis, and electrorefining for the novel rare metal production process; thermodynamic analysis for pyrometallurgical processes

Special Issue Information

Dear Colleagues,

Recycling is recognized as the most effective way to ensure material sustainability. In addition, the recovery process of secondary resources containing metals, mostly in the metallic or partially reduced state, can ensure significantly lower energy consumption and minimal impact on climate change compared to that of primary resources (the ores/minerals). In general, current metal recycling based on conventional metallurgical technology needs further development with an innovative recycling approach, in order to secure the sustainability of metal resources as industrial materials. However, it is not straightforward to develop a sustainable recycling technology that is applicable globally, because the components of secondary resources generating by-products/emissions and end-of-life products in the manufacturing process vary depending on the time of manufacture, country, and the company. Fortunately, the growth of multinational companies in an era of globalization provides scope for using almost identical products the world over, resulting in secondary resources with similar characteristics and increasing the possibility of a global recycling technology. For this purpose, the efficient exchange of technical information and collaborative research and development are essential. This Special Issue therefore aims to provide a place for sharing the latest metal recycling technologies currently being researched and developed in countries around the world.

In view of this, we invite authors to submit original research and review articles that will encourage the continuing efforts to develop innovative technology for the recycling of rare metals from waste resources. We would also welcome articles that are primarily based on the R&D directed toward practical recycling processes.

Dr. Jae-chun Lee
Dr. Jungshin Kang
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 recycling
  • Sustainability of materials
  • Climate change
  • Hydrometallurgical recycling
  • Pyrometallurgical recycling

Published Papers (2 papers)

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Research

11 pages, 6545 KiB  
Article
Thermal Decomposition Kinetics of Rare Earth Minerals in Tailings with Addition of MgO
by Yan Zhou, Shizhe Song, Jianxing Liu, Gongjin Cheng, He Yang and Xiangxin Xue
Metals 2021, 11(5), 701; https://doi.org/10.3390/met11050701 - 25 Apr 2021
Cited by 1 | Viewed by 1688
Abstract
Due to the advantage in deactivating fluorine and enhancing the decomposition of rare earth (RE) minerals, MgO was applied to the magnetizing roasting of Bayan Obo tailings in this work. The effects of MgO dosages, roasting temperature, and holding time on the decomposition [...] Read more.
Due to the advantage in deactivating fluorine and enhancing the decomposition of rare earth (RE) minerals, MgO was applied to the magnetizing roasting of Bayan Obo tailings in this work. The effects of MgO dosages, roasting temperature, and holding time on the decomposition rate of RE minerals were experimentally studied. With a MgO dosage of 10 wt.%, the decomposition rate of RE minerals reached 98.09% at 750 °C. The phase composition of roasted samples was characterized by XRD and SEM-EDS. The incomplete decomposition rate was investigated with the observation of leaching residual by SEM-EDS. The decomposition kinetics of the RE minerals with the addition of MgO was analyzed with the Ginstling-Brundshtein model, where the reaction rate was controlled by chemical reaction. Full article
(This article belongs to the Special Issue Advances in Valuable Metal Recycling)
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15 pages, 1592 KiB  
Article
Analysis of Valorization Process of Aluminum Breakage Scraps to Obtain Green Hydrogen
by Xavier Salueña Berna, Marc Marín-Genescà and José María Dagà-Monmany
Metals 2021, 11(4), 598; https://doi.org/10.3390/met11040598 - 06 Apr 2021
Cited by 6 | Viewed by 2275
Abstract
In this article, it is proposed to use aluminum breakage scraps to obtain green hydrogen through the aluminum–water reaction with caustic soda as a catalyst with experimental research. From this exothermic reaction, both hydrogen and the heat generated can be used. Due to [...] Read more.
In this article, it is proposed to use aluminum breakage scraps to obtain green hydrogen through the aluminum–water reaction with caustic soda as a catalyst with experimental research. From this exothermic reaction, both hydrogen and the heat generated can be used. Due to the low price of aluminum chips, this allows us to produce green hydrogen below the current price that is obtained using renewable energy sources and electrolyzers. We have also developed a process that is sustainable since it is obtained as alumina and caustic soda waste that can be reused. This alumina obtained, once filtered, has high purity which allows us to produce high-quality primary aluminum without the need to use bauxite and the production of red sludge is also reduced. A comparative study-analysis was carried out between two of the forms in which the most common aluminum is presented in industry to analyze which one performs better by studying key factors such as the hydrogen produced, and the waste generated during the process. Finally, the mathematical model has been defined to be able to control the flow based on different key parameters such as temperature, molarity, and geometry. Undoubtedly, the study that we present represents a milestone for the recovery of metallic aluminum waste and may be of great interest to industries that use aluminum in their processes, such as recuperators, as well as the vehicle and aerospace industries. Full article
(This article belongs to the Special Issue Advances in Valuable Metal Recycling)
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