Comparison of the electrochemical mechanism of chalcopyrite dissolution in the absence or presence of Sulfolobus metallicus at 70°C

Li, Alin; Huang, Songtao

doi:10.1016/j.mineng.2011.08.009

Cited by 16 publications

(11 citation statements)

References 12 publications

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“…These peaks indicated the occurrence of biomass. At the same time, there was a S-O bending vibration band at 1000-1200 cm −1 that could be assigned to SO 4 2− , and -NH vibration peaks at 1415 ( Figure 6C) and 1427 cm −1 (Figure 6D) that could be assigned to ammonium, which were similar to that of potassium jarosites and ammonium jarosites [30]. It is clear that both biomass and jarosites increased much more with bioleaching at the two treated surfaces cases ( Figure 6C,D) than that in the untreated surface case ( Figure 6B).…”

Section: Cell Attachment and Biofilm Formation On Chalcopyrite Surfacementioning

confidence: 68%

“…The intermediates may also affect the attachment behaviors of cells during bioleaching. Li and Huang [30] mentioned the appearance of S 0 on the chalcopyrite surface treated by electrochemical methods. In this study, covellite, bornite, and jarosites were detected on the chalcopyrite surface treated at 0.87 V, and covellite, bornite, jarosites, chalcocite, and S 0 were detected on the chalcopyrite surface treated at −0.54 V. Previous research showed that S 0 had no evident inhibitory effect on the copper extraction, although α-S 8 was produced as the predominant intermediate [28,31].…”

Section: Discussionmentioning

confidence: 99%

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The Evidence of Decisive Effect of Both Surface Microstructure and Speciation of Chalcopyrite on Attachment Behaviors of Extreme Thermoacidophile Sulfolobus metallicus

et al. 2018

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The effect of the surface microstructure and chemical speciation of chalcopyrite on the attachment behaviors of thermoacidophilic archaeon Sulfolobus metallicus was evaluated for the first time by using integrated techniques including epifluorescence microscopy (EFM) and sulfur K-edge X-ray absorption near edge structure (S K-edge XANES) spectroscopy, as well as scanning electron microscopy with energy dispersive spectrometry (SEM/EDS) and Fourier transform infrared (FT-IR) spectroscopy. In order to obtain the specific surface, the chalcopyrite slices were electrochemically oxidized at 0.87 V and reduced at −0.54 V, respectively. The EFM analysis showed that the quantity of cells attaching on the mineral surface increased with time, and the biofilm formed faster on the electrochemically treated slices than on the untreated ones. The SEM-EDS analysis indicated that the deficiency in energy substrate elemental sulfur (S 0) in the specific microsize of local defect sites was disadvantageous to the initial attachment of cells. The XANES and FT-IR data suggested that the elemental sulfur (S 0) could be in favor of initial attachment, and surface jarosites inhibited the adsorption and growth of S. metallicus. These results demonstrated that not only the surface microstructure but also the chemical speciation defined the initial attachment behaviors and biofilm growth of the extreme thermophilic archaeon S. metallicus.

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Section: Cell Attachment and Biofilm Formation On Chalcopyrite Surfacementioning

confidence: 68%

Section: Discussionmentioning

confidence: 99%

The Evidence of Decisive Effect of Both Surface Microstructure and Speciation of Chalcopyrite on Attachment Behaviors of Extreme Thermoacidophile Sulfolobus metallicus

et al. 2018

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“…We can analyze the reactions for each peak in the cyclic voltammogram of chalcopyrite alongside existing research conclusions. For peak A located within 0-200 mV, the main reaction was related to the reduction of some species produced like Cu 2+ in different states and Fe 3+ , which could be described by reaction Equations ( 1)-( 8) [3,11,15,34]. There was a peak B mainly attributed to the reactions in Equations ( 9) and ( 10) [11,15,34], which were related to the reduction of S 0 and the transformation of CuFeS 2 to Cu 2 S. However, in Figure 5, there was no obvious peak pattern around −200 mV, which might be due to the weak reaction not being shown.…”

Section: Cyclic Voltammogramsmentioning

confidence: 99%

“…At present, there have been many reports on promoting the leaching of chalcopyrite. Some studies use thermophilic microorganisms or mixed strains [8,15,16], or add metal ions for catalysis, such as Ag + [1,7,9,17], Fe 2+ [18,19], Cd 2+ [5], etc., or add another ore to form a galvanic cell [1,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Chalcopyrite Dissolution in Acidic Culture Medium: The Impact of Arsenopyrite Presence

Shangguan,

Liu,

Liu

et al. 2023

Minerals

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Nowadays, research on promoting the dissolution of chalcopyrite is important. As a natural symbiotic mineral of chalcopyrite, arsenopyrite will have an impact on the dissolution of chalcopyrite. This paper shows the influence of arsenopyrite on the dissolution of chalcopyrite in an acidic culture medium. The leaching results showed that adding arsenopyrite increased the leaching concentration of copper by 332 mg/L. The residues showed a decrease in sulfur through X-ray diffraction analysis (XRD) and an increase in dissolution degree through scanning electron microscope (SEM). Electrochemical experiments have shown that the rest potential of arsenopyrite is higher than that of chalcopyrite, so there is a galvanic interaction, and the impact on chalcopyrite is greater than that of arsenopyrite. The polarization curve also proves this. Under the interaction of galvanic couples, the reduction of S0 production and the enhancement of Cu2+ release can promote the dissolution of chalcopyrite. In addition, X-ray photoelectron spectrometer (XPS) analysis under the action of galvanic coupling indicates that more SO42− is generated on the surface of chalcopyrite, replacing Sn2−/S0, and SEM shows a stronger corrosion morphology. All results confirm that the electrochemical effect between arsenopyrite and chalcopyrite promotes the dissolution of chalcopyrite in the acidic culture medium.

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“…It was shown that Sulfolobus metallicus increases the oxidation rate of chalcopyrite, which results in an increased chalcopyrite corrosion potential and corrosion current density. S. metallicus may therefore reduce the polarization resistance of chalcopyrite in bioleaching (Li and Huang 2011).…”

Section: Introductionmentioning

confidence: 99%

An Electrochemical Study of the Influence ofMarinobacter aquaeoleion the Alteration of Hydrothermal Chalcopyrite (CuFeS₂) and Pyrite (FeS₂) under Circumneutral Conditions

Müller

Mills

Pearce

et al. 2014

Geomicrobiology Journal

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Pyrite and chalcopyrite are the two most abundant sulphides observed in seafloor hydrothermal systems. The alteration of sulphides is primarily controlled by reactions on the mineral surfaces and Fe(II)-oxidizing bacteria closely related to Marinobacter aquaeolei are thought to play a major role in iron oxidation under circumneutral conditions. We assessed the influence of M. aquaeolei on the electroactivity of FeS 2 and CuFeS 2 minerals under circumneutral conditions. Samples for the experiments were obtained from the Trans-Atlantic Geotraverse (TAG) hydrothermal mound (field), 26 • N on the Mid-Atlantic Ridge and Ireland (CuFeS 2 )]. The experimental approach relied on voltammetry and scanning electrochemical microscopy (SECM). The tip-substrate voltammetry mode of SECM was found to be particularly suitable to probe the major redox processes of those minerals and permitted an assessment of the microorganisms influence on these processes. M. aquaeolei was found to enhance FeS 2 and CuFeS 2 oxidation, particularly under suboxic conditions. M. aquaeolei also significantly enhances Fe dissolution under oxic circumneutral conditions but suppresses the dissolution of most other elements compared to abiotic conditions. Under abiotic conditions the surfaces of the minerals are rapidly passivated when oxygen is available; while addition of M. aquaeolei significantly hinders the passivation of chalcopyrite, no passivation of the pyrite surface is observed. This study demonstrates the ability of Marinobacter aquaeolei to enhance oxidation of FeS 2 and CuFeS 2 under circumneutral conditions and supports the involvement of Marinobacter species in weathering reactions on the seafloor and the control of the ultimate fate of sulphide deposits.

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Comparison of the electrochemical mechanism of chalcopyrite dissolution in the absence or presence of Sulfolobus metallicus at 70°C

Cited by 16 publications

References 12 publications

The Evidence of Decisive Effect of Both Surface Microstructure and Speciation of Chalcopyrite on Attachment Behaviors of Extreme Thermoacidophile Sulfolobus metallicus

The Evidence of Decisive Effect of Both Surface Microstructure and Speciation of Chalcopyrite on Attachment Behaviors of Extreme Thermoacidophile Sulfolobus metallicus

Enhanced Chalcopyrite Dissolution in Acidic Culture Medium: The Impact of Arsenopyrite Presence

An Electrochemical Study of the Influence ofMarinobacter aquaeoleion the Alteration of Hydrothermal Chalcopyrite (CuFeS₂) and Pyrite (FeS₂) under Circumneutral Conditions

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Comparison of the electrochemical mechanism of chalcopyrite dissolution in the absence or presence of Sulfolobus metallicus at 70°C

Cited by 16 publications

References 12 publications

The Evidence of Decisive Effect of Both Surface Microstructure and Speciation of Chalcopyrite on Attachment Behaviors of Extreme Thermoacidophile Sulfolobus metallicus

The Evidence of Decisive Effect of Both Surface Microstructure and Speciation of Chalcopyrite on Attachment Behaviors of Extreme Thermoacidophile Sulfolobus metallicus

Enhanced Chalcopyrite Dissolution in Acidic Culture Medium: The Impact of Arsenopyrite Presence

An Electrochemical Study of the Influence ofMarinobacter aquaeoleion the Alteration of Hydrothermal Chalcopyrite (CuFeS2) and Pyrite (FeS2) under Circumneutral Conditions

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An Electrochemical Study of the Influence ofMarinobacter aquaeoleion the Alteration of Hydrothermal Chalcopyrite (CuFeS₂) and Pyrite (FeS₂) under Circumneutral Conditions