Special Issue "Recovery and Recycling of Valuable Metals"

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 31 December 2020.

Special Issue Editor

Dr. Dariush Azizi
Guest Editor
Institut national de la recherche scientifique (INRS-Eau Terre et Environnement), Université du Quebec, Bureau 3339A- 490, rue de la Couronne, Québec, QC, G1K 9A9, Canada.
Interests: surface chemistry; extractive metallurgy; mineral processing; DFT simulations; waste valorization

Special Issue Information

Dear Colleagues,

Metals have always played a significant role in human life, and the current global growth and prosperity are directly dependent on these materials. With the rapidly growing global demand for metals, their extraction from natural minerals (as their primary sources) has been enhanced, causing a significant reduction in the grade and quality of the ores in ore deposits and leading to the production of huge amounts of waste which needs management. In light of this, new ideas to develop more advanced metal recovery technologies from minerals are required. Besides, the huge quantity of waste generated through all steps of metal production is known to be a source of environmental pollution, while its valorization can create value via recycling metals or even though use in the production of other valuable materials. Such waste valorization is also in line with the United Nations’ Sustainable Development Goals (SDGs) as well as implementation of the Paris Agreement. On this matter, the recycling of end-user products in order to reproduce valuable metals can also create significant values and reduce mining activities, and thus their harmful consequences all around the world. Therefore, research and development in the state-of-the-art technologies for the recovery and recycling of metals are absolutely necessary.   

In this Special Issue, the endeavor is to collect a range of articles on different aspects of valuable metal recovery and recycling from primary and secondary sources. The objective is to decipher all new methods, processes, and knowledge in valuable metals production. We hope this open-access Special Issue will provide a great opportunity to demonstrate the work of researchers working in this area all around the world. Articles on all areas of hydrometallurgy, mineral processing, and waste recycling and valorization are highly desired.

Dr. Dariush Azizi
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 papers will be 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 1600 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.


  • metal production
  • mineral processing
  • hydrometallurgy
  • extraction technologies
  • pyrometallurgy
  • waste valorization
  • primary metal sources
  • secondary metal sources
  • waste and end-user product recycling
  • process development

Published Papers (1 paper)

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Open AccessArticle
Recovery of Rubidium and Cesium Resources from Brine of Desalination through t-BAMBP Extraction
Metals 2020, 10(5), 607; https://doi.org/10.3390/met10050607 - 08 May 2020
50 billion cubic meters of brine every year creates ecological hazards to the environment. In order to reuse brine efficiently, rubidium and cesium were recovered in this experiment. On the other hand, the main impurities which were needed to be eliminated in brine [...] Read more.
50 billion cubic meters of brine every year creates ecological hazards to the environment. In order to reuse brine efficiently, rubidium and cesium were recovered in this experiment. On the other hand, the main impurities which were needed to be eliminated in brine were lithium, sodium, potassium, calcium, and magnesium. In the procedure, seawater was distilled and evaporated first to turn into simulated brine. Perchloric acid was then added into simulated brine to precipitate potassium perchlorate which could reduce the influence of potassium in the extraction procedure. After that, t-BAMBP and ammonia were separately used as extractant and stripping agent in the extraction and stripping procedures to get rubidium hydroxide solutions and cesium hydroxide solutions. Subsequently, they reacted with ammonium carbonate to get rubidium carbonate and cesium carbonate. In a nutshell, this study shows the optimal parameters of pH value to precipitate potassium perchlorate. Besides, pH value in the system, the concentration of t-BAMBP and ammonia, organic phase/aqueous phase ratio (O/A ratio), reaction time, and reaction temperature in solvent extraction step were investigated to get high purities of rubidium carbonate and cesium carbonate. Full article
(This article belongs to the Special Issue Recovery and Recycling of Valuable Metals)
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