Effect of pH and Fe(III) ions on chalcopyrite bioleaching by an adapted consortium from biogas sweetening

Dorado, Antonio David; Solé, M.; Lao, Conxita; Alfonso, Pura; Gamisans, Xavier

doi:10.1016/j.mineng.2012.06.009

Cited by 26 publications

(22 citation statements)

References 14 publications

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“…Several studies have been focused on the effects of H + , Fe 3+ , temperature and leaching bacteria on the bioleaching process [13,14]. The results implied that H + and Fe 3+ are of great benefit for the bio-oxidation and decomposition of sulfide minerals.…”

Section: Introductionmentioning

confidence: 99%

Mechanism for the Bio-Oxidation and Decomposition of Pentlandite: Implication for Nickel Bioleaching at Elevated pH

Sun

Wen

et al. 2020

Minerals

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This work investigated the effects of Fe3+, H+ and adsorbed leaching bacteria on the bioleaching of pentlandite. Collectively, an integrated model for the oxidation and decomposition of pentlandite was built to describe the behaviors of different components in a bioleaching system. Proton ions and ferric ions could promote the break and oxidation of Ni-S and Fe-S bonds. The iron-oxidizing microorganisms could regenerate ferric ions and maintain a high Eh value. The sulfur-oxidizing microorganisms showed significant importance in the oxidation of polysulfide and elemental sulfur. The atoms in pentlandite show different modification pathways during the bioleaching process: iron transformed through a (Ni,Fe)9S8 → Fe2+ → Fe3+ → KFe3(SO4)2(OH)6 pathway; nickel experienced a transformation of (Ni,Fe)9S8 → NiS → Ni2+; sulfur modified through the pathway of S2−/S22− → Sn2− → S0 → SO32− → SO42−. During bioleaching, a sulfur-rich layer and jarosite layer formed on the mineral surface, and the rise of pH value accelerated the process. However, no evidence for the inhibition of the layers was shown in the bioleaching of pentlandite at pH 3.00. This study provides a novel method for the extraction of nickel from pentlandite by bioleaching at elevated pH values.

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Section: Introductionmentioning

confidence: 99%

Mechanism for the Bio-Oxidation and Decomposition of Pentlandite: Implication for Nickel Bioleaching at Elevated pH

Sun

Wen

et al. 2020

Minerals

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“…The particle size used in the bioleaching experiments was between 2 and 3 mm, following the recommendations of Dorado et al 19 To obtain this size, the mineral was ground with a hammer mill (Serie 24, Humboldt Wedag Española SA, Spain) and sieved to the desired diameter range.…”

Section: Methodsmentioning

confidence: 99%

“…In this sense, it is well known that the use of pure cultures of Acidithiobacillus ferrooxidans or Acidithiobacillus thiooxidans in bioleaching results in high extraction yields of copper from minerals such as chalcopyrite 16 . However, mixed consortiums, containing these types of microorganisms can also be used for this purpose with several advantages such as the capacity to be adapted to the process in a short time and, thus, they are an economic alternative with greater potential for widespread use 17‐20 . In addition, it has been reported that the mixed consortia can be more efficient than pure culture since can be adapted easily to the process 21 …”

Section: Introductionmentioning

confidence: 99%

Influence of ore grade and mineral medium on chalcopyrite bioleaching with mixed microbial consortia

Benzal

Solé

Lao

et al. 2021

Env Prog and Sustain Energy

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In the present work, key parameters in copper bioleaching from chalcopyrite have been investigated at long‐term operation. In detail, the type of mixed microbial consortium (origin and adaptation); the composition of two mineral media (the growth medium and the modified 9K medium); its buffer capacity by the buffers HCl/KCl and Na2HPO4/KH2PO4; and the influence of different ore grades in relation with the potential alkalinity associated have been investigated. For the first time, a mixed microbial consortium, obtained from a gas‐phase biotrickling filter treating high loads of H2S, was employed revealing significant copper extraction by biological leaching. Results reveal that a single adaptation step of this biomass improved both kinetics and process efficiency, nearly doubling the amount of copper obtained compared with the non‐adapted consortium. Nevertheless, the growth medium also influences the efficiency of the bioleaching process, enhancing copper extraction at higher sulfate concentration. The ore containing the metal is also a determining factor, obtaining same copper extraction for biotic and abiotic in one case, and enhancing up to 50 times from the abiotic in the other. Thus, this becomes a relevant limitation for the applicability of bioleaching for some ores, mainly due to the composition of the matrix.

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“…Recently, bioleaching has been proposed as an alternative to conventional physical-chemical processes, showing important advantages such as low cost, high efficiency and environmental friendliness [8]. Bioleaching process has been studied for many years in the mining field [9][10][11], especially when low-grade ores have to be treated, due to the low cost of bioleaching process [12]. This technique, which has proven to be effective in this field, has been extended for the metal extraction from other possible metals sources [13,14].…”

Section: Introductionmentioning

confidence: 99%

Elemental Copper Recovery from e-Wastes Mediated with a Two-Step Bioleaching Process

Benzal

Solé

Lao

et al. 2020

Waste Biomass Valor

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Copper recovery from printed circuit boards (PCB) from waste mobile phones was investigated using a two-step bioleaching process. The method consists of a first step where Fe(II) ions are biologically oxidised to Fe(III) by Acidithiobacillus ferrooxidans. Later, Fe (III) ions are put in contact with the PCBs for copper solubilisation. At the conditions tested in the present work, the Fe(II) bio-oxidation (first step) was almost completed in 48 h. Two different methods (filtration and sedimentation) for biomass separation before the second step were tested. No significance differences between both separation methods were observed in terms of the overall process efficiency. In both cases, using 7.5 g/L of e-waste concentration, copper recovery of 95-100% were obtained in only 48 hours. In order to test an inexpensive and environmental friendly method to recovery the copper from the leachate solution, cementation of Cu (II) with metallic iron was performed. The copper powder obtained had purity of 64.8%.

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Effect of pH and Fe(III) ions on chalcopyrite bioleaching by an adapted consortium from biogas sweetening

Cited by 26 publications

References 14 publications

Mechanism for the Bio-Oxidation and Decomposition of Pentlandite: Implication for Nickel Bioleaching at Elevated pH

Mechanism for the Bio-Oxidation and Decomposition of Pentlandite: Implication for Nickel Bioleaching at Elevated pH

Influence of ore grade and mineral medium on chalcopyrite bioleaching with mixed microbial consortia

Elemental Copper Recovery from e-Wastes Mediated with a Two-Step Bioleaching Process

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