Mechanism of enhanced bioleaching efficiency of Acidithiobacillus ferrooxidans after adaptation with chalcopyrite

Xia, Lexian; Liu, Xinxing; Zeng, Jia; Yin, Chu; Gao, Jian; Liu, Jianshe; Qiu, Guanzhou

doi:10.1016/j.hydromet.2008.01.002

Cited by 53 publications

(24 citation statements)

References 23 publications

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“…Dong et al indicated that the bacterial adsorption quantity (A.t ferrooxidans LD-1) onto the five copper sulfide minerals had the same order as that of copper extractions (djurleite > bornite > pyritic chalcopyrite > covellite > porphyry chalcopyrite). Biosorption depended on both the biochemical properties of the bacteria and the interfacial properties of the solids [30]. High surface area, a microporous structure and high degree of surface reactivity, make activated carbons versatile adsorbents for both microbe and low copper ores [31].…”

Section: Adsorption Behaviors Of Bioleaching Microbes Onto Complex Comentioning

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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Section: Adsorption Behaviors Of Bioleaching Microbes Onto Complex Comentioning

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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“…Gómez et al (1999) obtained a maximum solubilization of 25% for copper in the bioleaching of an ore originating from Spain, with high concentrations of sulfide, using Acidithiobacillus ferrooxidans at a pulp density of 5%, at pH 2.0 after 15 days. Xia et al (2008) reported a differentiated bioleaching of chalcopyrite, using A. ferrooxidans, adapted or not adapted to Cu. After 21 days of the test, employing a pulp density of 5%, the recoveries were 47.5% and 39.5%, respectively.…”

Section: Indirect Microbial Leachingmentioning

confidence: 99%

BIOLEACHING OF METALS FROM A SPENT DIESEL HYDRODESULFURIZATION CATALYST EMPLOYING Acidithiobacillus thiooxidans FG-01

Ferreira

Sérvulo

Costa

et al. 2017

Braz. J. Chem. Eng.

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-This study evaluates the recovery of heavy metals employing a spent catalyst from the hydrodesulfurization (HDS) of diesel, with no chemical, thermal or physical pretreatment, using the bacterial strain Acidithiobacillus thiooxidans FG-01. Direct and indirect bioleaching tests were carried out in Erlenmeyer flasks (500 mL). The influence of the pulp density and supplementation with elemental sulfur on the bioleaching were also investigated. The spent catalyst contained organochlorines, petroleum hydrocarbons and heavy metals in its composition. The best recovery results (26% Al, 26% V and 39% Mo) were achieved in the two-stage (indirect) bioprocess, with a pulp density of 50 g/L. It was not possible to recover Co, Cu and Ni (< 5%) under any of the conditions tested. The bacterial strain A. thiooxidans FG-01 was found to be a promising candidate for the recovery of Al, V and Mo using the crude spent HDS catalyst.

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“…By continual growth of the bacteria in an environment that contains an increasing concentration of metals, the bacteria adapts and becomes tolerant to increasing toxic metals and copper. 83,84,85 Treatment of adapted cells A. ferrooxidans which are more tolerant of copper than unadapted cells by protein hydrolyzing enzymes leads to a loss of tolerance to copper. 86 …”

Section: Application Of Acidithiobacillus Ferrooxidans In Bioleachingmentioning

confidence: 99%

The Catalytic Role of Acidithiobacillus ferrooxidans for Metals Extraction from Mining - Metallurgical Resource

Maluckov

2017

BIJ

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Mechanism of enhanced bioleaching efficiency of Acidithiobacillus ferrooxidans after adaptation with chalcopyrite

Cited by 53 publications

References 23 publications

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

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

BIOLEACHING OF METALS FROM A SPENT DIESEL HYDRODESULFURIZATION CATALYST EMPLOYING Acidithiobacillus thiooxidans FG-01

The Catalytic Role of Acidithiobacillus ferrooxidans for Metals Extraction from Mining - Metallurgical Resource

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