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Minerals
Special Issues
Hydrometallurgy of Base and Precious Metals
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Hydrometallurgy of Base and Precious Metals

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 (15 May 2022) | Viewed by 8032

Special Issue Editors

Dr. Elsayed Oraby

E-Mail Website
Guest Editor
Western Australian School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Perth, WA 6102, Australia
Interests: leaching; gold; hydrometallurgy; base and precious metals; alternative lixiviants
Dr. Huan Li

E-Mail Website
Guest Editor
Western Australian School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Perth, WA 6102, Australia
Interests: e-waste recycling; lithium-ion battery recycling; environmentally benign hydrometallurgical process development; gold and copper recovery from concentrates, ores, and tailings; nickel and cobalt recovery from sulfide and laterite resources; lithium recovery from hard rocks (spodumene & lepidolite)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Precious metals are one of the most important pillars of many countries’ economy. This leads to the intensive support of different governments to the research in the minerals industry. This Special Issue of Minerals covers the hydrometallurgical aspects of the processing of base and precious metals. This Issue covers all aspects of the extractive metallurgy of precious metals (gold and silver) and base metals (copper, nickel, cobalt, and zinc).This Issue was designed to include submissions for any topics related to the processing of precious and base metals including mineralogy, chemistry, electrochemistry, thermodynamics, kinetics, filtration, nanofiltration, leaching, activated carbon, solvent extraction (SX), ion exchange (IX), sulfide precipitation, electrowinning (EW), chemical reduction, process economics, and process control. Any publications in the areas of the treatment of different precious and base metal resources such ores, tailings, concentrates, and E-waste are welcomed to be submitted to this Special Issue.

Dr. Elsayed Oraby
Dr. Huan Li
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

  •  Gold
  •  Cyanide
  •  Leaching
  •  Alternative Lixiviants
  •  PGMs
  •  Recovery
  •  Base Metals
  •  Silver
  •  Energy Metals
  •  Recycling

Published Papers (2 papers)

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Research

12 pages, 3996 KiB  
Article
Extraction of Gold and Copper from Flotation Tailings Using Glycine-Ammonia Solutions in the Presence of Permanganate
by Huan Li, Elsayed Oraby, Jacques Eksteen and Tanmay Mali
Minerals 2022, 12(5), 612; https://0-doi-org.brum.beds.ac.uk/10.3390/min12050612 - 12 May 2022
Cited by 10 | Viewed by 4199
Abstract
This study presents the novel idea of a cyanide-free leaching method, i.e., glycine-ammonia leaching in the presence of permanganate, to treat a low-grade and copper-bearing gold tailing. Ammonia played a key role as a pH modifier, lixiviant and potential catalyst (as cupric ammine) [...] Read more.
This study presents the novel idea of a cyanide-free leaching method, i.e., glycine-ammonia leaching in the presence of permanganate, to treat a low-grade and copper-bearing gold tailing. Ammonia played a key role as a pH modifier, lixiviant and potential catalyst (as cupric ammine) in this study. Replacing ammonia with other pH modifiers (i.e., sodium hydroxide or lime) made the extractions infeasibly low (<30%). The increased additions of glycine (23–93 kg/t), ammonia (30–157 kg/t) and permanganate (5–20 kg/t) enhanced gold and copper extractions considerably. Increasing the solids content from 20 to 40% did not make any obvious changes to copper extraction. However, gold leaching kinetics was slightly better at lower solids content. It was indicated that the staged addition of permanganate was unnecessary under the leaching conditions. Recovery of gold by CIL was shown to be feasible, and it improved gold extraction by 15%, but no effect was observed for copper extraction. Percentages of 76.5% gold and 64.5% copper were extracted in 48 h at 20 g/L glycine, 10 kg/t permanganate, 20 g/L carbon, pH 10.5 and 30% solids. Higher extractions could be potentially achieved by further optimization, such as by increasing permanganate addition, extending leaching time and ultra-fine grinding. Full article
(This article belongs to the Special Issue Hydrometallurgy of Base and Precious Metals)
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11 pages, 1433 KiB  
Article
Purification of Industrial Copper Electrolyte from Bismuth Impurity
by Patrycja Kowalik, Dorota Kopyto, Mateusz Ciszewski, Michał Drzazga and Katarzyna Leszczyńska-Sejda
Minerals 2022, 12(1), 36; https://0-doi-org.brum.beds.ac.uk/10.3390/min12010036 - 26 Dec 2021
Viewed by 3177
Abstract
This work focused on purifying copper electrolytes from a bismuth impurity on a laboratory scale. The electrolyte came from Polish copper electrorefineries with the content of main components, g/dm3: 49.6 Cu, 160 H2SO4. The electrolyte was enriched [...] Read more.
This work focused on purifying copper electrolytes from a bismuth impurity on a laboratory scale. The electrolyte came from Polish copper electrorefineries with the content of main components, g/dm3: 49.6 Cu, 160 H2SO4. The electrolyte was enriched in bismuth by Bi2O3 addition. Purification of bismuth contamination was carried out using selected agents with adsorbing effects, such as barium hydroxide octahydrate, strontium carbonate, barium carbonate, barium and lead sulfates. The trials were performed until achieving the Bi level—below 0.1 g/dm3. During the experiments, it was noticed that electrolyte purification degree depends on initial Bi concentration in electrolyte, time and temperature, as well as on the type and amount of the bismuth-lowering agent. The most satisfactory results of Bi impurity removal were with additions of barium hydroxide octahydrate, strontium carbonate and barium carbonate to electrolyte at 60 °C for 1 h. These parameters revealed the highest electrolyte purification degree. Bismuth is not removed effectively from electrolytes by barium sulfate or lead sulfate addition. The efficiency of the purification process is much higher when the agents are added to the solution in the form of carbonates or hydroxides. Extending the electrolyte purification process time may cause dissolution of bismuth from the resulting precipitate and increase of bismuth concentration in electrolytes. Full article
(This article belongs to the Special Issue Hydrometallurgy of Base and Precious Metals)
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