A review of sulfide minerals microbially assisted leaching in stirred tank reactors

Mahmoud, Akrama; Cézac, Pierre; Hoadley, Andrew; Contamine, François; d’Hugues, Patrick

doi:10.1016/j.ibiod.2016.09.015

Cited by 163 publications

(103 citation statements)

References 272 publications

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“…It could be recovered as Cu sulfate or as metallic Cu after appropriate further chemical treatment [44]. In the decade between 1990 and 2000, bacterial leaching of sulfide ores began developing rapidly [45]. Microbial-assisted recovery of heavy metals is now an established biotechnology [45].…”

Section: Copper Biohydrometallurgymentioning

confidence: 99%

“…In the decade between 1990 and 2000, bacterial leaching of sulfide ores began developing rapidly [45]. Microbial-assisted recovery of heavy metals is now an established biotechnology [45]. The main processes involved in this activity are bioleaching and bio-oxidation.…”

Section: Copper Biohydrometallurgymentioning

confidence: 99%

“…The main processes involved in this activity are bioleaching and bio-oxidation. Bioleaching refers to the mobilization of metal cations from ores by biologically mediated leaching and oxidation, and mineral bio-oxidation is used for extraction of target metals that are locked or entrapped by a mineral matrix [45]. Then, after biooxidation of the sulfide mineral matrix, target metals are leached with chemical lixiviants [46][47][48][49].…”

Section: Copper Biohydrometallurgymentioning

confidence: 99%

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Bioleaching of Arsenic-Bearing Copper Ores

2018

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Abstract:World copper (Cu) production has been strongly affected by arsenic (As) content, because As-rich Cu concentrates are not desirable in the metal foundries. When As-rich Cu concentrates are processed by smelting they release As as volatile compounds into the atmosphere and inside furnaces, generating serious risks to human health. In recent years, exports of Cu concentrates are being penalized for the increasingly high As content of the ores, causing economies that depend on the Cu market to be seriously harmed by this impurity. In the last few decades, biohydrometallurgy has begun to replace the traditional Cu sulfide processing, however bioleaching processes for As-bearing Cu ores which contain enargite are still in the development stage. Researchers have not yet made successful progress in enargite bioleaching using typical mesophilic and thermophilic bacteria that oxidize sulfide. New approaches based on direct oxidative/reductive dissolution of As from enargite could result in significant contributions to Cu biohydrometallurgy. Thus, As-rich Cu concentrates could be pre-treated by bioleaching, replacing current technologies like roasting, pressure leaching and alkaline leaching by selective biological arsenite oxidation or arsenate reduction. In this article, we review the As problem in Cu mining, conventional technologies, the biohydrometallurgy approach, and As bioleaching as a treatment alternative.

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Section: Copper Biohydrometallurgymentioning

confidence: 99%

Section: Copper Biohydrometallurgymentioning

confidence: 99%

Section: Copper Biohydrometallurgymentioning

confidence: 99%

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Bioleaching of Arsenic-Bearing Copper Ores

2018

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“…There is a large number of enterprises using heap leaching under natural conditions for copper production [6][7][8]. An attractive way to use acidophilic microorganisms from sulfide deposits is by implementing the stirred tank biohydrometallurgical technologies for the production of gold and nonferrous metals, which have a higher intensity compared to heap leaching and in situ leaching [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Processing of Sulfidic Polymetallic Concentrates Using Biohydrometallurgy

Muravyov¹,

Фомченко²

2019

World Congress on Civil, Structural, and Environmental Engineering

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Pyrometallurgical processing of sulfidic ores for recovery of non-ferrous metals is a traditional method. It requires the use of high-grade concentrates with high metal content, which are usually produced by flotation. A delay in exploration and exploitation of new deposits resulted in the involvement of lower-grade ores and ores with complex compound composition in the treatment. The development of methods for the processing of polymetallic difficult-to-beneficiation sulfidic concentrates is a relevant issue. In this paper, an eco-friendly technology for polymetallic sulfidic ore processing is proposed. It includes a biohydrometallurgical step for processing of low-grade polymetallic sulfidic concentrate and a pyrometallurgical step for processing of high-grade concentrates. The biotechnological step of the technology is a combination of leaching of the concentrate with biogenic ferric iron and bioregeneration of leaching solution with the use of acidophilic microorganisms. The results are relevant to the development of a two-step biohydrometallurgical technology for processing of copper-zinc concentrate with a closed cycle of technological flows. This technology could be a promising technique to reduce the environmental hazard of metallurgical plants.

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“…However, it should be noted that the bio-oxidation does not solubilise the valuable metal whereas bioleaching does (Mahmoud et al, 2016). Hence, bio-oxidation mainly refers to the microbial treatment of refractory gold ores prior to cyanidation extraction.…”

Section: Bio-metallurgymentioning

confidence: 99%

Differential oxidation of iron sulfides to modify the Au:S ratio in the flotation concentrate product at Lihir

John¹

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Sulfide associated refractory gold ores hold a majority of the gold within the pyrite, which has several forms. The high proportion of the gold atomically dispersed in the pyrite has been confirmed by various mineralogy techniques such as laser ablation analysis, optical microscopy, scanning electron microscopy and secondary ion mass spectrometry. Different types of pyrite exist within a refractory ore body and certain types possess a relative abundance of gold compared to other forms.The low gold pyrite influences the rate at which the concentrate can be processed by any particular route. If the different types of pyrite could be separated by flotation, then the gold grade of the final concentrate can be improved and the invisible gold could be recovered by downstream processing. This separation of low gold pyrite from the gold-rich pyrite would increase the gold:sulfur ratio (Au:S ratio) to the autoclave feed, thereby maximising the autoclave throughput and gold production per tonne.Different methods of extraction such as chemical oxidation, thermal oxidation and biological oxidation liberate gold from refractory ores. However, such oxidation methods have not been reported yet to be successful to allow separation of the low gold pyrite from the gold-rich pyrite and modify the Au:S ratio of a pyrite concentrate. This project is an attempt to develop a hydrometallurgical framework to modify the flotation response of gold-rich pyrite and low gold pyrite so that the Au:S ratio of the final flotation concentrate can be upgraded.ii

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A review of sulfide minerals microbially assisted leaching in stirred tank reactors

Cited by 163 publications

References 272 publications

Bioleaching of Arsenic-Bearing Copper Ores

Bioleaching of Arsenic-Bearing Copper Ores

Eco-Friendly Processing of Sulfidic Polymetallic Concentrates Using Biohydrometallurgy

Differential oxidation of iron sulfides to modify the Au:S ratio in the flotation concentrate product at Lihir

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