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Minerals
Special Issues
Bio-Metallurgical Processes and Sustainable Metal Recovery
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Bio-Metallurgical Processes and Sustainable Metal Recovery

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Environmental Mineralogy and Biogeochemistry".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 6013

Special Issue Editor

Dr. Karel Folens

E-Mail Website
Guest Editor
Center for Microbial Ecology and Technology, Ghent University, Coupure Links 653, B‐9000 Ghent, Belgium
Interests: bio-metallurgy and resource recovery; microbial metal interactions; biological sorption and accumulation processes; bio-analytical chemistry and molecular detection techniques, including speciation analysis

Special Issue Information

Dear Colleagues,

Bio-metallurgy has developed as a mature field in metal refining, found upon zero-waste solutions and sustainable processes. This Special Issue of Minerals on “Bio-Metallurgical Processes and Sustainable Metal Recovery” aims to showcase recent advances in

  • Heterotrophic and autotrophic bioleaching and metal extraction;
  • Biosorption, microbial accumulation, and bio-precipitation of metals;
  • Environmental remediation and bio-technology that aim at valorisation of metals from secondary sources;
  • Bio-based, integrated processes or green innovations in (bio-)electro-refining and hydrometallurgy.

Dr. Karel Folens
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 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

  • biometallurgy
  • bioleaching
  • biosorption
  • bioprecipitation
  • metal recovery
  • sustainable mineral processing
  • microbial metal interaction
  • biomining

Published Papers (2 papers)

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Research

20 pages, 3836 KiB  
Article
Effect of Initial Cell Concentration on Bio-Oxidation of Pyrite before Gold Cyanidation
by Ka Yu Cheng, Caroline C. Rubina Acuña, Naomi J. Boxall, Jian Li, David Collinson, Christina Morris, Chris A. du Plessis, Natalia Streltsova and Anna H. Kaksonen
Minerals 2021, 11(8), 834; https://doi.org/10.3390/min11080834 - 31 Jul 2021
Cited by 4 | Viewed by 1997
Abstract
Bio-oxidation of refractory sulfidic gold minerals has been applied at the commercial scale as a pre-treatment to improve gold yields and reduce chemical consumption during gold cyanidation. In this study, the effect of initial cell concentration on the oxidation of pyritic gold ore [...] Read more.
Bio-oxidation of refractory sulfidic gold minerals has been applied at the commercial scale as a pre-treatment to improve gold yields and reduce chemical consumption during gold cyanidation. In this study, the effect of initial cell concentration on the oxidation of pyritic gold ore was evaluated with four aerated bioreactors at 30 °C with 10% pulp density and pH maintained at 1.4 with NaOH. Results of NaOH consumption and changes in soluble Fe and S concentrations indicated that increasing the initial cell concentration from 2.3 × 107 to 2.3 × 1010 cells mL−1 enhanced pyrite oxidation during the first week. However, by day 18 the reactor with the lowest initial cell concentration showed profound performance enhancement based on soluble Fe and S concentrations, sulfide-S and pyrite contents in the residues, and subsequent gold leaching of the bio-oxidation residues by cyanidation. Overall, the results showed that the cell concentration was clearly beneficial during the initial stages of oxidation (first 7–8 days). Full article
(This article belongs to the Special Issue Bio-Metallurgical Processes and Sustainable Metal Recovery)
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13 pages, 2033 KiB  
Article
Bioleaching of Gold from Silicate Ore by Macrococcus caseolyticus and Acinetobacter calcoaceticus: Effect of Medium, Amino Acids and Growth Supernatant
by Kanjana Kudpeng, Parinda Thayanukul and Paitip Thiravetyan
Minerals 2021, 11(6), 580; https://doi.org/10.3390/min11060580 - 30 May 2021
Cited by 6 | Viewed by 3166
Abstract
The aims of this work were to study the gold leaching by the isolated bacteria from silicate ore. Three strains were isolated and identified as Macrococcus caseolyticus, Acinetobacter calcoaceticus, and Bacillus sp. MBEA40. However, only M. caseolyticus and A. calcoaceticus were [...] Read more.
The aims of this work were to study the gold leaching by the isolated bacteria from silicate ore. Three strains were isolated and identified as Macrococcus caseolyticus, Acinetobacter calcoaceticus, and Bacillus sp. MBEA40. However, only M. caseolyticus and A. calcoaceticus were capable of gold bioleaching. In order to examine only the effect of microorganisms involved in the gold bioleaching process, minimal medium and ethanol mineral salt medium without amino acids were used for culturing M. caseolyticus and A. calcoaceticus, respectively. The result showed that the growth supernatant (in the absence of microorganisms) of both strains might be more suitable to leaching gold from ore than leaching by microorganisms (in the presence of microorganisms) directly. This might be due to the fact that there is no interference of gold absorption and metal toxicity in microorganisms in the long-term operation. The result also confirmed that amino acids/peptides/proteins produced by microorganisms might be involved in gold bioleaching, as shown in the high-performance liquid chromatography (HPLC) results. The Fourier transform infrared spectroscopy (FTIR) study also found that amine groups and carboxylic groups played important roles in gold bioleaching by M. caseolyticus and A. calcoaceticus. In addition, the bioleaching process had significantly higher gold leaching than mixed pure amino acids due to the growth supernatant containing mixed amino acids/peptides/proteins and other compounds. Therefore, the growth supernatant of M. caseolyticus and A. calcoaceticus can be applied in gold bioleaching under neutral pH conditions, which is considered to be a safe, not corrosive, and environmentally friendly leaching process. This study is also needed further study in order to increase the percentage of gold bioleaching and decrease times. Full article
(This article belongs to the Special Issue Bio-Metallurgical Processes and Sustainable Metal Recovery)
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