Bioleaching and electrochemical properties of chalcopyrite by pure and mixed culture of Leptospirillum ferriphilum and Acidthiobacillus thiooxidans

Gu, Guohua; Hu, Ke-ting; Li, Shuang-ke

doi:10.1007/s11771-013-1474-2

Cited by 18 publications

(4 citation statements)

References 15 publications

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“…The mixture of all studied microorganisms showed the highest efficiency of oxidation of both sulfide minerals and elemental sulfur. This agrees with the results of numerous studies that reported the advantage of combined cultures of iron-and sulfur-oxidizing acidophiles over their pure cultures during oxidation of various substrates, including those containing chalcopyrite, pyrite, and covellite [50][51][52][53][54][55]. The most common explanation for the high efficiency of the microbial community is a more successful removal of the products of oxidation reactions (including elemental sulfur) from the surface of sulfide minerals.…”

Section: Microbialsupporting

confidence: 90%

Distinct Roles of Acidophiles in Complete Oxidation of High-Sulfur Ferric Leach Product of Zinc Sulfide Concentrate

Muravyov¹,

Panyushkina²

2020

Microorganisms

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A two-step process, which involved ferric leaching with biologically generated solution and subsequent biooxidation with the microbial community, has been previously proposed for the processing of low-grade zinc sulfide concentrates. In this study, we carried out the process of complete biological oxidation of the product of ferric leaching of the zinc concentrate, which contained 9% of sphalerite, 5% of chalcopyrite, and 29.7% of elemental sulfur. After 21 days of biooxidation at 40 °C, sphalerite and chalcopyrite oxidation reached 99 and 69%, respectively, while the level of elemental sulfur oxidation was 97%. The biooxidation residue could be considered a waste product that is inert under aerobic conditions. The results of this study showed that zinc sulfide concentrate processing using a two-step treatment is efficient and promising. The microbial community, which developed during biooxidation, was dominated by Acidithiobacillus caldus, Leptospirillum ferriphilum, Ferroplasma acidiphilum, Sulfobacillus thermotolerans, S. thermosulfidooxidans, and Cuniculiplasma sp. At the same time, F. acidiphilum and A. caldus played crucial roles in the oxidation of sulfide minerals and elemental sulfur, respectively. The addition of L. ferriphilum to A. caldus during biooxidation of the ferric leach product proved to inhibit elemental sulfur oxidation.

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Section: Microbialsupporting

confidence: 90%

Distinct Roles of Acidophiles in Complete Oxidation of High-Sulfur Ferric Leach Product of Zinc Sulfide Concentrate

Muravyov¹,

Panyushkina²

2020

Microorganisms

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“…In the process of bioleaching a sulfide ore, the introduction of sulfur-oxidizing microorganisms into a pure culture or a mixed culture dominated by iron-oxidizing microorganisms is conducive to the oxidation of the passivation layer on the surface of the ore (Deng et al 2017 ). Therefore, elemental S is oxidized to sulfuric acid, and the pH of the culture medium decreases, which inhibits the formation of the potassium ferrovanadium passivation layer (Gu et al 2015 ) and ultimately improves the efficiency of bioleaching (Gu et al 2013 ).…”

Section: Biofilm Of Acidophilic Microorganisms In Bioleaching Wlibsmentioning

confidence: 99%

Advances in bioleaching of waste lithium batteries under metal ion stress

Zhang

Shi²,

Tan³

et al. 2023

Bioresour. Bioprocess.

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In modern societies, the accumulation of vast amounts of waste Li-ion batteries (WLIBs) is a grave concern. Bioleaching has great potential for the economic recovery of valuable metals from various electronic wastes. It has been successfully applied in mining on commercial scales. Bioleaching of WLIBs can not only recover valuable metals but also prevent environmental pollution. Many acidophilic microorganisms (APM) have been used in bioleaching of natural ores and urban mines. However, the activities of the growth and metabolism of APM are seriously inhibited by the high concentrations of heavy metal ions released by the bio-solubilization process, which slows down bioleaching over time. Only when the response mechanism of APM to harsh conditions is well understood, effective strategies to address this critical operational hurdle can be obtained. In this review, a multi-scale approach is used to summarize studies on the characteristics of bioleaching processes under metal ion stress. The response mechanisms of bacteria, including the mRNA expression levels of intracellular genes related to heavy metal ion resistance, are also reviewed. Alleviation of metal ion stress via addition of chemicals, such as spermine and glutathione is discussed. Monitoring using electrochemical characteristics of APM biofilms under metal ion stress is explored. In conclusion, effective engineering strategies can be proposed based on a deep understanding of the response mechanisms of APM to metal ion stress, which have been used to improve bioleaching efficiency effectively in lab tests. It is very important to engineer new bioleaching strains with high resistance to metal ions using gene editing and synthetic biotechnology in the near future.

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“…Direct acid leaching processes such as ferric salt leaching, pressure oxidative leaching [3,4], and bioleaching [5][6][7] were performed. An alternative process by roasting prior to direct leaching was also employed for improving dissolution efficiency of valuable metals.…”

Section: Introductionmentioning

confidence: 99%

Leaching kinetics of calcification roasting calcinate from multimetallic sulfide copper concentrate containing high content of lead and iron

Liao

Zhou

Huang

et al. 2015

Separation and Purification Technology

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Bioleaching and electrochemical properties of chalcopyrite by pure and mixed culture of Leptospirillum ferriphilum and Acidthiobacillus thiooxidans

Cited by 18 publications

References 15 publications

Distinct Roles of Acidophiles in Complete Oxidation of High-Sulfur Ferric Leach Product of Zinc Sulfide Concentrate

Distinct Roles of Acidophiles in Complete Oxidation of High-Sulfur Ferric Leach Product of Zinc Sulfide Concentrate

Advances in bioleaching of waste lithium batteries under metal ion stress

Leaching kinetics of calcification roasting calcinate from multimetallic sulfide copper concentrate containing high content of lead and iron

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