Oxidation of chalcopyrite by Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans in shake flasks

Bevilaqua, Denise; Leite, Aline L.; Garcia, Oswaldo; Tuovinen, Olli H.

doi:10.1016/s0032-9592(02)00169-3

Cited by 107 publications

(68 citation statements)

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“…5b) were obtained in 30 days in chemical and bioleaching respectively. This shows the efficacy of bacteria to work at higher pulp ratio when compared to the results with mesophiles [5,6]. On further increasing the pulp density to 10% and 20%, the copper biorecovery was found to increase from 78% to 82% (Fig.…”

Section: Effect Of Pulp Densitymentioning

confidence: 72%

“…Different ores and concentrates have been tested to be amenable to leaching of copper, nickel, zinc, cobalt, uranium by acidophilic microorganisms in single or by mixed cultures of different species of both mesophilic and thermophilic microbes [2]. Temperature and ferric concentration greatly influence the efficiency of the chalcopyrite leaching [5,6]. In mesophilic conditions, ferric ions are effective for leaching chalcopyrite with bacteria maintaining high ferric to ferrous ratio and a high redox potential [4].…”

mentioning

confidence: 99%

“…This passivating layer could come from one or both of two sources: Fe(OH) 3 tends to form jarosite (KFe 3 (SO 4 ) 2 (OH) 6 ), which coats the unreacted material and forms a passivating layer and/or, the elemental sulfur formed in reaction (1), which also tends to coat the surface. It has been found from fundamental electrochemistry that the newer technology, using thermophilic microorganisms such that the temperature can be raised to 60 • C (140 • F) or higher, destabilizes the passivating layer on chalcopyrite [14][15][16][17].…”

mentioning

confidence: 99%

“…Application of these thermophiles has been widely reported in metal biodissolution processes, especially in copper bioleaching from chalcocite and covellite [22]. However, a scanty work has been found for low grade chalcopyrite [5,6], which is considered otherwise difficult to be processed by conventional hydrometallurgical route [2].…”

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confidence: 99%

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Bioleaching of low grade granitic chalcopyrite ore by hyperthermophiles: Elucidation of kinetics-mechanism

Abhilash¹,

Ghosh²,

Pandey³

2015

Metall. Res. Technol.

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-The current work was off-shoot of an attempt to isolate a thermophilic pyritic sulfur degrading bacteria in selective medium from a coal mine dump. This thermophilic bacteria (archaea) classified as Sulfolobus was tested for its feasibility to bioleach copper from a low grade Indian chalcopyrite ore (0.3% copper). With its prevalent ability to preferentially attack pyrite (a major phase in the ore), bioleaching was investigated at various parameters of pH, pulp density (PD), particle size, and temperature. A reflective high 85% copper recovery was obtained using <50 µm particles at 20% (w/w) pulp density, pH 2.0, 75 • C in 30 days. The copper dissolution was facilitated by iron (III) available in the leach liquor because of bacterial oxidation of pyrite present in the ore under acidic conditions. The biogenically generated Fe (III) ions enhanced copper dissolution from the chalcopyrite ore. The bioleaching of copper appeared to follow chemical control kinetic model with the reaction of lixiviant-Fe (III) and acid on the surface of the solid. Phase identification by XRD and SEM study corroborated the above mechanism of copper leaching.

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Section: Effect Of Pulp Densitymentioning

confidence: 72%

mentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Bioleaching of low grade granitic chalcopyrite ore by hyperthermophiles: Elucidation of kinetics-mechanism

Abhilash¹,

Ghosh²,

Pandey³

2015

Metall. Res. Technol.

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“…5 It is well known that chalcopyrite out of all present phases in the mineral is refractory to acid and bacterial attack. 16,17 On the contrary bornite is easily solubilized, 13,18 probably due to the fact that in its crystalline structure the iron is more exposed, 19 leading to iron dissolution via acid attack. Therefore, the mineral surface is enriched with copper sulfide by chemical attack in experiments with and without the addition of bacteria, explaining the results illustrated in Table 1, where region 1 was mainly attacked.…”

Section: Resultsmentioning

confidence: 99%

Characterization of bornite (Cu5FeS4) electrodes in the presence of the bacterium Acidithiobacillus ferrooxidans

Bevilaqua¹,

Fugivara²,

Sanz³

et al. 2003

J. Braz. Chem. Soc.

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Eletrodos de bornita foram caracterizados na presença e na ausência de Acidithiobacillus ferrooxidans, um importante microorganismo envolvido nos processos de lixiviação de metais. A presença da bactéria modificou significativamente a interface mineral/eletrólito, aumentando a taxa de corrosão, como revelado pelas análises interferométricas, AEM, ICP e EIS. A atividade bacteriana sobre o eletrodo de bornita o tornou poroso e conseqüentemente aumentaram sua área e heterogeneidade. Este comportamento foi correlacionado com a evolução dos diagramas de impedância obtidos durante o tempo do experimento. A principal diferença nestes diagramas foi a presença de uma característica indutiva (até 44 h), a qual está relacionada com a ação bacteriana sobre a dissolução do mineral e não com sua adesão. A impedância real total medida na presença da bactéria foi cerca de 10 vezes menor do que na sua ausência, devido a aceleração na dissolução do mineral, uma vez que é mantido o meio oxidante.Bornite electrodes were characterized in the absence or in the presence of Acidithiobacillus ferrooxidans, which is an important microorganism involved in metal bioleaching processes. The presence of the bacterium modified the mineral/electrolyte interface, increasing the corrosion rate, as revealed by interferometric, AEM, ICP and EIS analyses. As a consequence of bacterial activity the electrode became porous, increasing its surface heterogeneity. This behavior was correlated with the evolution of impedance diagrams obtained during the time course of experiments. The main difference in these diagrams was the presence of an inductive feature (up to 44 h), which was related to bacterial action on the mineral dissolution, better than to its adhesion on the bornite. The total real impedance measured in presence of the bacterium was about 10 times lower than in its absence, due to the acceleration of the mineral dissolution, because an oxidant environment was maintained. Keywords: Acidithiobacillus ferrooxidans, electrochemical impedance spectroscopy (EIS), bornite IntroductionAcidithiobacillus ferrooxidans, formerly Thiobacillus ferrooxidans 1 is an acidophilic chemolithoautrophic bacterium capable to utilize either ferrous iron (Fe 2+ ) or reduced sulfur compounds, including mineral sulfides, as the sole energy sources for its growth. Due to its capacity to oxidize metal sulfides, this bacterium is one of the most important microorganism utilized in industrial operations to recover metals, such as copper, uranium and gold. 2 The knowledge of the mechanisms of bacterial dissolution of sulfides has been focused in several copper minerals, in order to improve the efficiency of the bioleaching operations.The mineral bornite (Cu 5 FeS 4 ) is an important source of copper and its composition can be written as 2(Cu 2 S)CuS.FeS to show that copper in the mineral occurs in both monovalent and divalent states. 3 A large variety of experiments has been performed with mostly natural sulfide samples, in the presence of bacteria and chemicals, which also...

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Recovery of Copper from Printed Circuit Boards Waste by Bioleaching

Yamane¹,

Espinosa²,

Tenório³

2011

Recycling of Electronic Waste II

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Oxidation of chalcopyrite by Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans in shake flasks

Cited by 107 publications

References 9 publications

Bioleaching of low grade granitic chalcopyrite ore by hyperthermophiles: Elucidation of kinetics-mechanism

Bioleaching of low grade granitic chalcopyrite ore by hyperthermophiles: Elucidation of kinetics-mechanism

Characterization of bornite (Cu5FeS4) electrodes in the presence of the bacterium Acidithiobacillus ferrooxidans

Recovery of Copper from Printed Circuit Boards Waste by Bioleaching

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