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Recovery of Precious Metals, Rare Earth Elements and Special Metals...
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Recovery of Precious Metals, Rare Earth Elements and Special Metals from Spent Secondary Products, Volume II

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Processing and Extractive Metallurgy".

Deadline for manuscript submissions: closed (30 November 2022) | Viewed by 5080

Special Issue Editors

Prof. Dr. Zenixole Tshentu

E-Mail Website
Guest Editor
School of Biomolecular and Chemical Sciences, Department of Chemistry, Nelson Mandela University, Port Elizabeth 6031, Africa
Interests: base metals; PGMs; hydrometallurgy; desulfurization; denitrogenation; functional materials
Special Issues, Collections and Topics in MDPI journals
Dr. Durga Parajuli

E-Mail Website
Guest Editor
Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba 305-8565, Japan
Interests: fabrication, characterization, application of materials for energy and environment
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

The global demand for precious metals, in chemical, petrochemical, electrical and electronic products, medical and dentistry applications, jewelry and automobile industries, against the dwindling natural deposits; demands the development of more efficient recovery methods, as well as a move towards urban mining. The latter is becoming more attractive due to the high yields compared with extraction from primary ores. Current recovery rates of precious metals and REEs from spent products are low and there is a need to drive towards a closed-loop recycling system. However; the heterogeneous nature of such secondary sources of precious metals and REEs demands the development of robust methods for the recovery of strategic metals. This Special Issue will contribute to the knowledge gap in the characterization and recycling of precious metals and REEs from spent secondary materials. Spent secondary materials include catalytic converters, electronic boards, magnet scraps, fluorescent lamps, CRTs, LCDs, PV cells, solar panels, batteries, and fly ash, among others.

Prof. Dr. Zenixole Tshentu
Dr. Durga Parajuli
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. Minerals 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 2400 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

  • precious metals
  • REEs
  • spent products
  • metal scrap
  • urban mining

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Published Papers (1 paper)

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Research

21 pages, 2707 KiB  
Article
Recovery of Rare Earth Elements Present in Mobile Phone Magnets with the Use of Organic Acids
by Ronei Tiago Stein, Angela Cristina Kasper and Hugo Marcelo Veit
Minerals 2022, 12(6), 668; https://doi.org/10.3390/min12060668 - 27 May 2022
Cited by 13 | Viewed by 4717
Abstract
Currently, the recovery of materials from secondary sources is increasingly necessary because of the scarcity of materials. Significant amounts of rare earth elements (REE) are found in permanent neodymium-iron-boron (NdFeB) magnets, used in various electrical and electronic equipments, such as mobile phones. However, [...] Read more.
Currently, the recovery of materials from secondary sources is increasingly necessary because of the scarcity of materials. Significant amounts of rare earth elements (REE) are found in permanent neodymium-iron-boron (NdFeB) magnets, used in various electrical and electronic equipments, such as mobile phones. However, the estimated recycling rate for REEs is only 1%. Hydrometallurgical routes are the most commonly used for REE recovery from secondary sources. This route usually uses inorganic acids, which are expensive and toxic. Thus, in this work the leaching efficiency of organic acids (acetic and citric) in leaching the REE (neodymium and praseodymium) present in magnets of obsolete or defective mobile phones was evaluated. Different concentrations of acids, solid/liquid relations, times and leaching techniques (microwave, ultrasound and conventional) are also evaluated. The results indicate that acetic and citric acids have the potential to leach Nd and Pr. Microwave leaching was the most effective method, compared to ultrasound and conventional methods. In microwaves, citric acid at 0.5 M (ratio s/l 1/100) leached 57% of Nd and 58% of Pr. Acetic acid at 0.5 M (s/l ratio—1/100) leached 48% of Nd and 65% of Pr, in 15 min. Furthermore, both citric acid and acetic acid also leached high percentages of iron (51% and 72%, respectively). Full article
(This article belongs to the Special Issue Recovery of Precious Metals, Rare Earth Elements and Special Metals from Spent Secondary Products, Volume II)
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