Electrochemical bioleaching of high grade chalcopyrite flotation concentrates in a stirred bioreactor

Ahmadi, Ahmad; Schaffie, Mahin; Manafi, Zahra; Ranjbar, Mohammad

doi:10.1016/j.hydromet.2010.05.001

Cited by 112 publications

(53 citation statements)

References 21 publications

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“…Yu et al (2011) reported that a high redox potential (ORP) can also cause the rapid deterioration of ion diffusion performance of extracellular polymeric substances (EPS) and resulted in passivation. Many efforts have been made to control the redox potential (ORP) at an appropriate range (about 380-480 mV) to enhance bioleaching process of chalcopyrite (Ahmadi et al, 2010;Gericke et al, 2010;Sandström et al, 2005;Third et al, 2002). Therefore, the addition of bornite promoted the dissolution of chalcopyrite (A) mainly by controlling the redox potential (ORP) at an appropriate range (380-480 mV).…”

Section: Bioleaching Of Chalcopyrite and Bornitementioning

confidence: 99%

Effects of pyrite and bornite on bioleaching of two different types of chalcopyrite in the presence of Leptospirillum ferriphilum

Zhao

Wang

Gan

et al. 2015

Bioresource Technology

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Section: Bioleaching Of Chalcopyrite and Bornitementioning

confidence: 99%

Effects of pyrite and bornite on bioleaching of two different types of chalcopyrite in the presence of Leptospirillum ferriphilum

Zhao

Wang

Gan

et al. 2015

Bioresource Technology

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“…It increases by the activity of iron-oxidizing microorganisms. This increase is beneficial for the dissolution of most of the metallic sulfides such as chalcocite, covellite and pyrite, but, in the case of chalcopyrite, the leaching behavior is more complicated in which its dissolution rate is maximal at low redox potentials [2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Influence of Ferric and Ferrous Iron on Chemical and Bacterial Leaching of Copper Flotation Concentrates

Ahmadi¹

2012

IJNM

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The effects of ferrous and ferric iron as well as redox potential on copper and iron extraction from the copper flotation concentrate of Sarcheshmeh, Kerman, Iran, were evaluated using shake flask leaching examinations. Experiments were carried out in the presence and absence of a mixed culture of moderately thermophile microorganisms at 50˚C. Chemical leaching experiments were performed in the absence and presence of 0.15 M iron (ferric added medium, ferrous added medium and a mixture medium regulated at 420 mV, Pt. vs. Ag/AgCl). In addition, bioleaching experiments were carried out in the presence and absence of 0.1 M iron (ferric and ferrous added mediua) at pulp density 10% (w/v), inoculated bacteria 20% (v/v), initial pH 1.6, nutrient medium Norris and yeast extract addition 0.02% (w/w). Abiotic leaching tests showed that the addition of iron at low solution redox potentials significantly increased the rate and extent of copper dissolution but when ferric iron was added, despite a higher initial rate of copper dissolution, leaching process stopped. Addition of both ferrous and ferric iron to the bioleaching medium levelled off the copper extraction and had an inhibitory effect which decreased the final redox potential. The monitoring of ferrous iron, ferric iron and copper extraction in leach solutions gave helpful results to understand the behaviour of iron cations during chemical and bacterial leaching processes.

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“…In addition, high redox potentials also caused the rapid deterioration of ion diffusion performance of EPS and readily formed the passivation layer [41,42]. Therefore, many efforts have been made to control the redox potential at an appropriate range to improve chalcopyrite bioleaching efficiency [43]. Hiroyoshi et al [44] proposed the two-step dissolution model of chalcopyrite in acid solution.…”

Section: The Copper Phase Analysis Of Bioleached Residuesmentioning

confidence: 99%

Carbon Material with High Specific Surface Area Improves Complex Copper Ores’ Bioleaching Efficiency by Mixed Moderate Thermophiles

et al. 2018

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Abstract:The catalysis of carbon materials with different specific surface areas (SSA) (2, 400, 800 and 1200 m 2 /g) on complex copper ores bioleaching by moderately mixed thermophiles was investigated. The copper extractions increased with the rise in SSA of carbon materials. A recovery of 98.8% copper in the presence of 1200 m 2 /g activated carbon was achieved, and improved by 30.7% and 76.4% compared with biotic control and chemical leaching. Moreover, the addition of 1200 m 2 /g activated carbon adsorbed large amount of bacteria, accelerated the oxidation rate of ferrous iron and maintained the solution redox potential at relatively low values, and significantly increased the dissolution of primary copper sulfide (62.7%) compared to biotic control (6.0%). Microbial community succession revealed that activated carbon changed the microbial community composition dramatically. The S. thermosulfidooxidans ST strain gained a competitive advantage and dominated the microbial community through the whole bioleaching process. The promoting effect of carbon material with higher SSA on copper extraction was mainly attributed to better galvanic interaction, biofilm formation, direct contact and lower redox potential.

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Electrochemical bioleaching of high grade chalcopyrite flotation concentrates in a stirred bioreactor

Cited by 112 publications

References 21 publications

Effects of pyrite and bornite on bioleaching of two different types of chalcopyrite in the presence of Leptospirillum ferriphilum

Effects of pyrite and bornite on bioleaching of two different types of chalcopyrite in the presence of Leptospirillum ferriphilum

Influence of Ferric and Ferrous Iron on Chemical and Bacterial Leaching of Copper Flotation Concentrates

Carbon Material with High Specific Surface Area Improves Complex Copper Ores’ Bioleaching Efficiency by Mixed Moderate Thermophiles

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