Geochemical investigations of noble metal-bearing ores: Synchrotron-based micro-analyses and microcosm bioleaching studies

Brinza, Loredana; Ahmed, Imad A. M.; Cismasiu, C. M.; Ardelean, I.; Breaban, Iuliana Gabriela; Doroftei, Florica; Ignatyev, Konstantin; Moisescu, Cristina; Neamţu, Mariana

doi:10.1016/j.chemosphere.2020.129388

Cited by 4 publications

(2 citation statements)

References 49 publications

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“…Actualmente, la tostación y la oxidación a presión tienen como alternativa el tratamiento con microorganismos (Ahn J., 2019). Partículas de oro y plata atrapadas en matrices de pirita, calcopirita y arsenopirita son liberadas por la acción de bacterias oxidantes de hierro, determinándose que una mayor concentración de inóculo bacteriano condujo a un aumento en la cantidad de metales biolixiviados (Brinza et al, 2021).…”

Section: Estado Del Arteunclassified

Biooxidation of refractory silver minerals as pretreatment for silver recovery

Arias Arce,

Avilés Mera,

Surichaqui Hidalgo

et al. 2023

Rev. Inst. investig. Fac. minas metal cienc. geogr

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The worldwide demand for silver is increasing due to the technological development in different areas, especially for the requirements in the production of renewable energies; therefore, for the treatment of refractory minerals by conventional processes, it is necessary to study mechanisms to identify the viability of their processing and the feasibility of their recovery, ensuring profitability. Gold and silver present in the matrix of sulfide-based ores are not affordably recovered by the conventional method involving leaching in sodium cyanide solution. Therefore, it must be subjected to oxidation pretreatment or conversion of the sulfides to simple compounds that allow recovery of the precious metals. The methods of oxidation of minerals considered refractory are carried out by hydro and pyrometallurgical methods, seeking the dissolution of sulfur, iron, arsenic and other elements present. It is important to identify and consider the mineralogical structure, microbiological variety, physicochemical characteristics, types of reactors, bacterial interactions, among other factors. The choice of biooxidation as the preferred process in projects for the recovery of gold, silver, copper or other metals, in most cases is based on the economic advantage, compared to the conventional processes of roasting, chemical leaching and pressurized leaching. The biooxidation of refractory argentiferous ores has been extensively studied in recent years, concluding that its application is feasible, mainly because it is environmentally friendly.

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Section: Estado Del Arteunclassified

Biooxidation of refractory silver minerals as pretreatment for silver recovery

Arias Arce,

Avilés Mera,

Surichaqui Hidalgo

et al. 2023

Rev. Inst. investig. Fac. minas metal cienc. geogr

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“…Bioleaching, which uses bacteria for gold extraction, offers an environmentally friendly alternative. A previous study examined bioleaching using the iron-oxidising bacteria of Acidithiobacillus ferrooxidans (Brinza et al, 2021). However, the induction of exogenous or exotic bacteria in the bioleaching process caused competition with local bacteria, thereby resulting in negative effects (Phyo et al, 2020).…”

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Characteristics of rhizobacteria in potential hyperaccumulator vegetation and their resistance to gold mine tailing stress

Aminatun,

Rakhmawati,

Atun

et al. 2024

Journal of Water and Land Development

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The use of local bacteria is preferred in bioleaching as an environmental-friendly alternative technology in gold mining. In a preliminary study, rhizobacteria were isolated and cultured from three types of hyperaccumulator vegetation from the Ratatotok gold mine, Indonesia, namely Pteris vittata L., Syzygium aromaticum L., and Swietenia mahagoni Jacq. These rhizobacteria still need to be characterised and identified. This study is aimed to cover bacterial phenotypic characterisation, assessment of bacteria resistance to tailing, and identification of bacterial strains the exhibit the highest resistance to tailings. The assessment was carried out across a spectrum of tailing concentrations, selecting the three most robust strains for molecular identification. The process involved genotypic characterisation to determine the species name by analysing the 16S rRNA gene. The results reveal that the phenotypic characteristics of the bacteria isolates vary, but all of them are the indole acetic acid (IAA) hormone producers. The highest IAA producer is the isolate from the rhizosphere of S. aromaticum. Based on the genotypic characterisation test, three most resistant isolates to tailing stress are the following strains Pseudomonas aeruginosa (RTKP1) and Stenotrophomonas geniculata (RTKP2), both from the rhizosphere of P. vittata; as well as Bacillus cereus (RTKS) from the rhizosphere of S. aromaticum. These three strains need to be further tested for their bioleaching capability to recover gold from tailings. Additionally, this study recommends that gold recovery using biological agents can combine the role of hyperaccumulator plants in phytomining and rhizobacteria in bioleaching.

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Mineralogical characteristics and recovery process optimization analysis of a refractory gold ore with gold particles mainly encapsulated in pyrite and Arsenopyrite

Yang

Zhao

et al. 2023

Geochemistry

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Geochemical investigations of noble metal-bearing ores: Synchrotron-based micro-analyses and microcosm bioleaching studies

Cited by 4 publications

References 49 publications

Biooxidation of refractory silver minerals as pretreatment for silver recovery

Biooxidation of refractory silver minerals as pretreatment for silver recovery

Characteristics of rhizobacteria in potential hyperaccumulator vegetation and their resistance to gold mine tailing stress

Mineralogical characteristics and recovery process optimization analysis of a refractory gold ore with gold particles mainly encapsulated in pyrite and Arsenopyrite

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