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Metals
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Recent Advances in Leaching and Extractive Metallurgy
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Recent Advances in Leaching and Extractive Metallurgy

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 9540

Special Issue Editors

Dr. Rahul Ram

E-Mail Website
Guest Editor
School of Earth Atmosphere and Environment, Monash University, Melbourne, VIC, Australia
Interests: hydrometallurgy; minerals engineering; sustainable mining; thermodynamics; advanced synchrotron science; environmental remediation; applied geochemistry
Dr. Mark I. Pownceby

E-Mail Website
Guest Editor
CSIRO Mineral Resources, Private Bag 10, Clayton South, VIC 3169, Australia
Interests: applied/process mineralogy; experimental petrology and phase equilibria; geometallurgy; iron ore characterization and processing (beneficiation, agglomeration, sintering); ore mineralogy; materials characterization (SEM, EPMA, in situ XRD); heavy mineral sand deposits; uranium deposits; hydrometallurgy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The recovery of metals from ores, concentrates, and recycled or residual material plays an integral role in the multi-billion-dollar minerals processing industry. It represents a significant value asset in both developed and developing nations, and is often integrally linked to local communities. A combination of processes is integral across various stages in typical mining recovery and mineral processing circuits, be it comminution and/or beneficiation of the ore; leaching (in-situ, heap, or tank/autoclave); flotation and smelting of the concentrate/matte; electro-refining and solvent exchange processes to obtain final product; or the treatment of waste tailings/slags.

Current extraction technologies to mine and recover metals from their ores are faced with a multitude of issues related to the chemistry, geology, and engineering aspects of the processes involved. These issues include declining ore grade, variations in mineralogy across the deposits, and geo-metallurgical locations of the ore site, which influence the type of process chosen (i.e., pyrometallurgical smelting, hydrometallurgical (bio or chemical), or beneficiation/pre-treatment of ores). The development of technologies that improve energy efficiency, water and resource consumption, and waste remediation (particularly acid-rock drainage) across the circuit is also an important factor to be considered.

Therefore, there is an increased impetus to further advance and implement environmentally sustainable practices in the recovery of valuable metals through the development of novel leaching and extractive technologies in metallurgy. Papers on recent advances, and review articles—particularly in regard to fundamental science, extractive metallurgy (both upstream and downstream processes), and the development of technologies in the processing of mineral commodities from their ores—are invited for inclusion in this Special Issue on “Recent Advances in Leaching and Extractive Metallurgy”.

Dr. Rahul Ram
Dr. Mark I. Pownceby
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
  • sustainable mining
  • flotation
  • beneficiation
  • pyrometallurgy
  • process optimization
  • process circuit
  • tailings treatment
  • waste remediation

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Published Papers (2 papers)

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Research

10 pages, 3741 KiB  
Article
Preparation of Battery-Grade Lithium Carbonate with Lithium-Containing Desorption Solution
by Zheng-Guo Xu and Shu-Ying Sun
Metals 2021, 11(9), 1490; https://doi.org/10.3390/met11091490 - 19 Sep 2021
Cited by 8 | Viewed by 5959
Abstract
In this study, a process for preparing battery-grade lithium carbonate with lithium-rich solution obtained from the low lithium leaching solution of fly ash by adsorption method was proposed. A carbonization-decomposition process was carried out to remove impurities such as iron and aluminum. First, [...] Read more.
In this study, a process for preparing battery-grade lithium carbonate with lithium-rich solution obtained from the low lithium leaching solution of fly ash by adsorption method was proposed. A carbonization-decomposition process was carried out to remove impurities such as iron and aluminum. First, primary Li2CO3 was treated by CO2 to get the more soluble bicarbonates. The decomposition of LiHCO3 produced insoluble Li2CO3 at 90 °C And Li2CO3 was smashed by air stream pulverization. The final precipitation yielded a high purity (99.6%) and homogeneous Li2CO3. Some factors affecting production efficiency were investigated. The results showed that a liquid-solid ratio of 25:1, a carbonization temperature of 25 °C, an air velocity of 2 L/min, and a stirring speed of 400 rpm; a decomposition temperature of 90 °C and a stirring speed of 400 rpm, a molar ratio of EDTA to Ca 2:1; an air pressure of 0.3 MPa and hot water washing precipitate (L/S mass ratio 2:1) promoted ions removal. Full article
(This article belongs to the Special Issue Recent Advances in Leaching and Extractive Metallurgy)
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20 pages, 4623 KiB  
Article
Acid Mine Drainage Dynamics from a Paste Tailing Deposit: Effect of Sulfate Content on the Consistency and Chemical Stability after Storage
by Eduardo Leiva, María Cayazzo, Luis Dávila, Mario Torres and Christian Ledezma
Metals 2021, 11(6), 860; https://doi.org/10.3390/met11060860 - 25 May 2021
Cited by 9 | Viewed by 2470
Abstract
Surface paste tailings’ disposal has emerged recently as an optimal and efficient method to favor tailings’ self-containment after being deposited into dams. This disposal method can improve the reuse of water and reduce the generation of acid mine drainage (AMD) and the release [...] Read more.
Surface paste tailings’ disposal has emerged recently as an optimal and efficient method to favor tailings’ self-containment after being deposited into dams. This disposal method can improve the reuse of water and reduce the generation of acid mine drainage (AMD) and the release of leachates (e.g., acid and heavy metals). However, the implications of chemical factors or mixed-water chemistry in the stability of paste tailings over time are not clear. In this work, we evaluated the release of sulfate from tailing samples and the role of sulfate as a critical factor in the tailings’ strength, consistency, and stability. Our results showed that the release of acid runoff with high sulfate load from the tailings is negligible. Leaching tests were performed for 180 days and did not show a significant release of sulfate, heavy metals, or acid waters. However, the presence of sulfate salts derived from the binders used in the pretreatment of the paste tailings shows an impact on the tailings’ consistency. Undrained triaxial monotonic compression tests revealed low effective cohesion forces in the tailings samples. In addition, it was observed that, in tailings slurries prepared with varying concentrations of sulfate (0, 500, and 1000 mg/L), the slump test value dropped Δ−55% when the sulfate concentration increased from 0 to 1000 mg/L. These results support the idea that the presence of sulfate within the tailings could be relevant for the paste consistency after storage. This knowledge will contribute to a better understanding of the critical chemical factors that affect the stability of paste tailings over time. Full article
(This article belongs to the Special Issue Recent Advances in Leaching and Extractive Metallurgy)
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