Mesophilic and thermophilic bioleaching of copper from a chalcopyrite-containing molybdenite concentrate

Abdollahi, Hadi; Shafaei, Sied Ziaedin; Noaparast, Mohammad; Manafi, Zahra; Niemelä, Seppo; Tuovinen, Olli H.

doi:10.1016/j.minpro.2014.02.003

Cited by 42 publications

(14 citation statements)

References 34 publications

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“…Our previous study demonstrated that silver addition enhances the bioleaching of Cu from a chalcopyrite-containing molybdenite concentrate (Abdollahi et al, 2014). The present work expands the previous study by examining the effect of several independent variables, most importantly the concentration of silver, initial pH, pulp density, and mesophilic and moderately thermophilic microbial consortia on the bioleaching of chalcopyrite.…”

Section: Introductionsupporting

confidence: 68%

“…These observations were also verified with EDAX-analyses, which were carried out with scanning electron microscopy and backscattered electron emission. The same bulk sample was used in our previous study of silver catalysis (Abdollahi et al, 2014).…”

Section: Molybdenite Concentratementioning

confidence: 99%

“…Two mixed cultures of acidophilic microorganisms, detailed by Abdollahi et al (2014), were used in the bioleaching experiments. The mesophilic consortium originated from mine drainage of the Sarcheshmeh copper mine, Kerman Province.…”

Section: Microorganismsmentioning

confidence: 99%

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Silver-catalyzed bioleaching of copper, molybdenum and rhenium from a chalcopyrite–molybdenite concentrate

Abdollahi

Noaparast

Shafaei

et al. 2015

International Biodeterioration & Biodegradation

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Section: Introductionsupporting

confidence: 68%

Section: Molybdenite Concentratementioning

confidence: 99%

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Silver-catalyzed bioleaching of copper, molybdenum and rhenium from a chalcopyrite–molybdenite concentrate

Abdollahi

Noaparast

Shafaei

et al. 2015

International Biodeterioration & Biodegradation

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“…In the case of chalcopyrite-bearing molybdenite, extreme thermoacidophiles achieve selective copper dissolution, leading to improvement of molybdenum flotation concentrates, with minimal (<10%) molybdenum dissolution [387,388]. Further, there is evidence that extremely thermoacidophilic archaea may be more adept than mesophilic bacteria at extracting copper from other copper-sulfide ores, based on column bioleaching involving covellite (CuS) and enargite (Cu3AsS4) [6].…”

Section: Current Biooxidation/bioleaching Practices At Elevated Tempementioning

confidence: 99%

The Confluence of Heavy Metal Biooxidation and Heavy Metal Resistance: Implications for Bioleaching by Extreme Thermoacidophiles

et al. 2015

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Extreme thermoacidophiles (Topt > 65 °C, pHopt < 3.5) inhabit unique environments fraught with challenges, including extremely high temperatures, low pH, as well as high levels of soluble metal species. In fact, certain members of this group thrive by metabolizing heavy metals, creating a dynamic equilibrium between biooxidation to meet bioenergetic needs and mechanisms for tolerating and resisting the toxic effects of solubilized metals. Extremely thermoacidophilic archaea dominate bioleaching operations at elevated temperatures and have been considered for processing certain mineral types (e.g., chalcopyrite), some of which are recalcitrant to their mesophilic counterparts. A key issue to consider, in addition to temperature and pH, is the extent to which solid phase heavy metals are solubilized and the concomitant impact of these mobilized metals on the microorganism's growth physiology. Here, extreme thermoacidophiles are examined from the perspectives of biodiversity, heavy metal biooxidation, metal resistance mechanisms, microbe-solid interactions, and application of these archaea in biomining operations.

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“…The majority of chemolithotrophic microbes reported for mineral processing belong to genera of Acidithiobacillus, Leptospirillum and Sulphobacillus etc. [45,46]. Among these microbes, Acidithiobacillus ferrooxidans bacterium is more elaborately studied for bioleaching studies.…”

Section: Chemolithotrophic Microorganisms In Processing Of Lateritic mentioning

confidence: 99%

Advances in microbial leaching processes for nickel extraction from lateritic minerals - A review

Behera

Mulaba‐Bafubiandi

2015

Korean J. Chem. Eng.

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Lateritic nickel minerals constitute about 80% of nickel reserves in the world, but their contribution for nickel production is about 40%. The obstacles in extraction of nickel from lateritic minerals are attributed to their very complex mineralogy and low nickel content. Hence, the existing metallurgical techniques are not techno-economically feasible and environmentally sustainable for processing of such complex deposits. At this juncture, microbial mineral processing could be a benevolent approach for processing of lateritic minerals in favor of nickel extraction. The microbial mineral processing route offers many advantages over conventional metallurgical methods as the process is operated under ambient conditions and requires low energy input; thus these processes are relatively simple and environment friendly. Microbial processing of the lateritic deposits still needs improvement to make it industrially viable. Microorganisms play the pivotal role in mineral bio-processing as they catalyze the extraction of metals from minerals. So it is inevitable to explore the physiological and bio-molecular mechanisms involved in this microbe-mineral interaction. The present article offers comprehensive information about the advances in microbial processes for extraction of nickel from laterites.

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Mesophilic and thermophilic bioleaching of copper from a chalcopyrite-containing molybdenite concentrate

Cited by 42 publications

References 34 publications

Silver-catalyzed bioleaching of copper, molybdenum and rhenium from a chalcopyrite–molybdenite concentrate

Silver-catalyzed bioleaching of copper, molybdenum and rhenium from a chalcopyrite–molybdenite concentrate

The Confluence of Heavy Metal Biooxidation and Heavy Metal Resistance: Implications for Bioleaching by Extreme Thermoacidophiles

Advances in microbial leaching processes for nickel extraction from lateritic minerals - A review

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