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
Sustainability for Extraction and Recovery of Precious, Strategic and Rare...
share announcement

Sustainability for Extraction and Recovery of Precious, Strategic and Rare Earth Metals

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

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 8252

Special Issue Editors

Prof. Dr. Juan Hernández-Ávila

E-Mail Website1 Website2
Guest Editor
Academic Area of Earth Sciences and Materials, Autonomous University of the State of Hidalgo, Mineral de la Reforma 42184, Mexico
Interests: leaching of precious metals; waste treatment; cationic exchange
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Eleazar Salinas-Rodríguez

E-Mail Website
Guest Editor
Academic Area of Earth Sciences and Materials, Institute of Basic Sciences and Engineering, Autonomous University of the State of Hidalgo, Pachuca 42184, Mexico
Interests: leaching; metals recovery; metals concentration; precious metals
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Hydrometallurgical processes for the extraction and recovery of metals are highly topical issues not only because of the advantages of the hydrometallurgical process itself but also because of their advantages in the treatment of complex ores, their lower rate of contaminating residues, their proportionally lower cost, and their versatility for treating new ores of different strategic minerals.

Likewise, with the increased use of environmentally friendly reagents along with new applications and innovative technologies, which have led to the processing of minerals that were considered marginal until some time ago, and the progress in hydrometallurgical processes, it is possible to treat ores with low grades, urban mining residues, and other recycled materials containing metals of economic interest, such as many strategic, industrial, and also rare earth ores.

Therefore, it is necessary to obtain a broad and diverse vision of the current stages among the different topics of hydrometallurgical processes for the extraction and recovery of metals based on the fundamentals of the aforementioned sciences. In addition, it is important to seek new scientific contributions for the rational and sustainable recovery of these metals.

Therefore, the Special Issue will be dedicated to the collection of articles on recent advances in the recovery of metals from various sources of raw materials, as well as the recovery of metals by means of different extractive metallurgical processes, and the synthesis of compounds and solid solutions from hydrometallurgical processes. The articles must deal with innovative results of a scientific or industrial nature and, in particular, should relate to precious, strategic, and rare earth metals.

Prof. Dr. Juan Hernández-Ávila
Prof. Dr. Eleazar Salinas-Rodríguez
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

  • Hydrometallurgy
  • Leaching
  • Recovery
  • Precious Metals
  • Recycling
  • Rare Earths
  • Cation Exchange
  • Minerals
  • Synthetic and Natural Adsorbents
  • Synthesis of Compounds and Solid Solutions

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

Jump to: Review

14 pages, 6833 KiB  
Article
Dissolution Kinetics of Chlorine from Iron Ore Sintering Dust
by Honghu Tang, Lihua Zhao, Yue Yang, Haisheng Han, Li Wang and Wei Sun
Metals 2021, 11(8), 1185; https://doi.org/10.3390/met11081185 - 26 Jul 2021
Cited by 3 | Viewed by 1927
Abstract
Chlorine is generated during iron ore sintering, mostly in the form of alkali chlorides and primarily accumulates in sintering dust, which must be removed before reusing. In this study, an in-situ monitor leaching system based was designed to detect chloride ion water leaching [...] Read more.
Chlorine is generated during iron ore sintering, mostly in the form of alkali chlorides and primarily accumulates in sintering dust, which must be removed before reusing. In this study, an in-situ monitor leaching system based was designed to detect chloride ion water leaching behaviors in real-time and improve the understanding of chlorine dissolution kinetic behaviors in water. Various parameters, including water leaching temperature, solid/liquid ratio, stirring speed, particle size and surfactant addition have been studied. Meanwhile their chlorine dissolution data exhibited a good fit to Stumm’s kinetic models. The results of kinetics analysis and transition state theory calculation on apparent activation energy demonstrated that the dissolution process was controlled by diffusion at low S/L ratio, while changed to be controlled by surface chemical reaction as the S/L ratio increased. Furthermore, increasing both temperature and stirring speed improved the chlorine removal speed. Moreover, reducing the particle size and adding 0.2% nonionic surfactant Triton X-100 reduced the surface energy and accelerated surface chemical reaction, which were also beneficial for removing chlorine from sintering dust. In addition, the SEM-EDS examination inferred that the existence of laurionite (PbOHCl) limited the chlorine dissolution rate to less than 97%, while beneficiation or hydrometallurgy treatment was needed to further remove chlorine. Full article
(This article belongs to the Special Issue Sustainability for Extraction and Recovery of Precious, Strategic and Rare Earth Metals)
►▼ Show Figures

Figure 1

10 pages, 1006 KiB  
Article
Comparative Study of MnO2 Dissolution from Black Copper Minerals and Manganese Nodules in an Acid Medium
by Carlos Moraga, Eduardo Cerecedo-Saenz, Javier González, Pedro Robles, Francisco Raul Carrillo-Pedroza and Norman Toro
Metals 2021, 11(5), 817; https://doi.org/10.3390/met11050817 - 18 May 2021
Cited by 6 | Viewed by 2105
Abstract
The low grade of copper deposits and the use of the froth flotation process have caused excessive tailing production. In recent years, experts have looked for new alternative methods to improve this situation. Black copper minerals are abundant resources not exploited by large-scale [...] Read more.
The low grade of copper deposits and the use of the froth flotation process have caused excessive tailing production. In recent years, experts have looked for new alternative methods to improve this situation. Black copper minerals are abundant resources not exploited by large-scale copper mining and possess high Mn concentrations. On the other hand, manganese nodules are submarine resources and show high concentrations of Cu, Ni, Fe, and, mainly, Mn. However, both mineral resources are refractory to conventional leaching processes, and so a reducing agent is necessary for their treatment. We studied the use of tailings obtained from the flotation of foundry slags with a high content of Fe3O4 as reducing agents at different MnO2/tailings ratios and H2SO4 concentrations. Mn dissolution was compared in marine nodule and black copper minerals samples. It was found that higher Mn dissolutions are obtained from marine nodules, likely due to the acid consumption created by Cu dissolution from black copper minerals. The remnant elements in manganese nodules were leached under an oxidant condition. Full article
(This article belongs to the Special Issue Sustainability for Extraction and Recovery of Precious, Strategic and Rare Earth Metals)
►▼ Show Figures

Figure 1

Review

Jump to: Research

17 pages, 339 KiB  
Review
Submarine Tailings in Chile—A Review
by Freddy Rodríguez, Carlos Moraga, Jonathan Castillo, Edelmira Gálvez, Pedro Robles and Norman Toro
Metals 2021, 11(5), 780; https://doi.org/10.3390/met11050780 - 11 May 2021
Cited by 11 | Viewed by 3692
Abstract
This review aims to understand the environmental impact that tailings produce on the land and marine ecosystem. Issues related to flora, fauna, and the environment are revised. In the first instance, the origin of the treatment and disposal of marine mining waste in [...] Read more.
This review aims to understand the environmental impact that tailings produce on the land and marine ecosystem. Issues related to flora, fauna, and the environment are revised. In the first instance, the origin of the treatment and disposal of marine mining waste in Chile and other countries is studied. The importance of tailings’ valuable elements is analyzed through mineralogy, chemical composition, and oceanographic interactions. Several tailings’ treatments seek to recover valuable minerals and mitigate environmental impacts through leaching, bioleaching, and flotation methods. The analysis was complemented with the particular legislative framework for every country, highlighting those with formal regulations for the disposal of tailings in a marine environment. The available registry on flora and fauna affected by the discharge of toxic metals is explored. As a study case, the “Playa Verde” project is detailed, which recovers copper from marine tailings, and uses phytoremediation to neutralize toxic metals. Countries must regularize the disposal of marine tailings due to the significant impact on the marine ecosystem. The implementation of new technologies is necessary to recover valuable elements and reduce mining waste. Full article
(This article belongs to the Special Issue Sustainability for Extraction and Recovery of Precious, Strategic and Rare Earth Metals)
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