The bioleaching of different sulfide concentrates using thermophilic bacteria

Torres, Francisco Alexander Morales; Blázquez, M.L.; González, F.; Ballester, A.; Mier, J. L.

doi:10.1007/bf02653862

Cited by 14 publications

(15 citation statements)

References 12 publications

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“…Chalcopyrite (CuFeS 2 ) is also the most important copper ore mineral and several studies have assessed the efficiency of Cu extraction, for example by increasing oxidation through Downloaded by [University of Massachusetts] at 07:57 03 January 2015 addition of Ag + ions and/or bioleaching with bacteria (Juarez et al 2006;Munoz et al 1998;Qiu et al 2000;Rodriguez et al 2003;Stott et al 2003;Third et al 2000;Torres et al 1995;Watling 2006). Bioleaching of low-grade chalcopyrite ores has the advantage of using less energy compared to conventional metallurgical methods and it is more environmentally friendly (Xia et al 2010).…”

Section: Introductionmentioning

confidence: 98%

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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Section: Introductionmentioning

confidence: 98%

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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“…However, thermophile microorganisms, such as Sulfolobus, Acidianus and Metallosphaera have been shown to leach chalcopyrite to high extractions at temperatures in the range 65-75°C (Konishi et al, 1999;Torres et al, 1995;Howard and Crundwell, 1999), both in shake flasks and stirred tanks. The success of thermophiles over mesophiles has not yet been clearly explained, but it has been observed that thermophile leaching takes place in a fairly low potential environment (380-500 mV Ag/AgCl) in which chalcopyrite passivation is not observed (Petersen et al, 2001;Gerike et al, 2001;Third et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Thermophilic heap leaching of a chalcopyrite concentrate

Petersen

Dixon

2002

Minerals Engineering

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Thermophiles have been shown to be the only micro-organisms to leach chalcopyrite successfully. Heap leaching may be a feasible alternative to conventional bio-reactors, providing a high temperature environment can be maintained within the heap without external heating.In the present study thermophilic heap leaching of a chalcopyrite concentrate coated onto inert support rocks (the GEOCOATe process) was studied in sets of small heated columns. The temperature was gradually increased to 70°C, while successively introducing various mesophile and thermophile cultures. Individual columns were dismantled after progressively longer leach periods and the residual concentrates analysed. Copper extractions in excess of 90% were achieved within 100 days.On the basis of head and residue analyses the rate of reaction heat generated was calculated. A comprehensive heap heat conservation model was used to determine whether the experimental temperatures can be achieved and maintained in a full scale heap. Results indicate that operating hot heaps successfully is possible within a certain range of process parameters.

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“…Many researchers (Konishi et al, 1999;Torress et al, 1995, and Ho ward and Gu indwell 1999) reported that thermophile macroorganism such as sulfolobus acidiamus and metallosphaera have been shown to leach chalcopyrite to high extraction at temperature range 65 -75 o C, both in shakes flask and stirred tanks. The success of thermophile over mesophiles has not yet been clearly explained, but it has been observed that thermophile leaching takes place in a fairly low potential environ ment (380 -500 mV Ag/AgCl) in wh ich chalcopyrite passivation is not observed (Petersen et The experiments verify the enhancement due to chloride and surfactant addition in the leaching system of chalcopyrite and H2SO4.…”

Section: Microbi Al Leaching Studies On Chalcopyritementioning

confidence: 99%

A Review on Novel Techniques for Chalcopyrite Ore Processing

Baba¹,

Ayinla²,

Adekola³

et al. 2012

MINING

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Chalcopyrite ores are usually processed by means of hydrometallurg ical or pyro metallurgical processes, but due to environmental aspects and the possibility of increased exp loitation of mixed and lower grade ores and relat ively small isolated deposits, there has been a worldwide upsurge of interest in the hydrometallurg ical processes of this ore as compared to pyrometallurgy. The different concentrates obtained through differential flotation in pyro metallu rgy are usually of poor quality with low metal recovery. This further makes pyrometallurgical processing of chalcopyrite very difficult and costly and rendered them difficult to commercialize. As a result, the metal value is preferab ly extracted directly fro m low grade ores through hydrometallurg ical process. A detailed review of chalcopyrite deposits, production and consumption, min ing, ore processing, steps involved in the pyrometallurgical and hydrometallurgical processing of copper as well as the dissolution kinetics and microbial studies of chalcopyrite ore were discussed.

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The bioleaching of different sulfide concentrates using thermophilic bacteria

Cited by 14 publications

References 12 publications

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

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

Thermophilic heap leaching of a chalcopyrite concentrate

A Review on Novel Techniques for Chalcopyrite Ore Processing

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The bioleaching of different sulfide concentrates using thermophilic bacteria

Cited by 14 publications

References 12 publications

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

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

Thermophilic heap leaching of a chalcopyrite concentrate

A Review on Novel Techniques for Chalcopyrite Ore Processing

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Product

Resources

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

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