Biodissolution of pyrite and bornite by moderate thermophiles

Wu, Xueling; Liao, Wanqing; Peng, Tangjian; Qiu, Guanzhou; Dolgor, Erdenechimeg; Zeng, Weimin

doi:10.1007/s11771-022-5166-7

Cited by 4 publications

(3 citation statements)

References 50 publications

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“…Recently, it was found that an appropriate Fe/S ratio in the ores is critical for the growth and activities of the bioleaching microorganisms, which would be the prerequisite for the synergistic effects of the bacterial consortia (Xia et al, 2009 ). The process of community succession and metabolism of a microbial consortium composed of Acidithiobacillus thiooxidans ( A. thiooxidans ), Acidithiobacillus ferrooxidans ( A. ferrooxidans ) and Leptospirillum ferriphilum ( L. ferriphilum ) were closely related to the leaching behavior of minerals, and could be regulated by mineral composition and element ratio like iron/sulfur ratio (Yang et al, 2021 ; Sun et al, 2022 ; Wu et al, 2022 ). The variation in energy metabolism structure of the microbial community during chalcopyrite bioleaching with different iron/sulfur ratios was proved different (Yang et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Sulfur enhancement effects for uranium bioleaching in column reactors from a refractory uranium ore

Yang

et al. 2023

Front. Microbiol.

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The feasibility of sulfur enhancement for uranium bioleaching in column reactors was assessed with a designed mixed Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans and Leptospirillum ferriphilum from a refractory uranium ore. The uranium extraction reached 86.2% with the sulfur enhancement (1 g/kg) in 77 days leaching process, increased by 12.6% vs. the control without sulfur addition. The kinetic analysis showed that uranium bioleaching with sulfur enhancement in columns followed an internal diffusion through the product layer-controlled model. Ore residue characteristics indicated that sulfur enhancement could strengthen the porosity of passivation layer, improving the ore permeability. Notably, bacterial community analysis showed that sulfur enhancement at 1 g/kg could make the iron-oxidizing and sulfur-oxidizing bacteria on the ore surface maintain a good balance (approx. 1:1), and thus decomposing ore more effectively. Lastly, a possible mechanism model for uranium bioleaching with sulfur enhancement was proposed.

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Section: Introductionmentioning

confidence: 99%

Sulfur enhancement effects for uranium bioleaching in column reactors from a refractory uranium ore

Yang

et al. 2023

Front. Microbiol.

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“…Although At. ferrooxidans was considered to be the most important microorganism in bioleaching of metals for many years, leptospirilla have been found to be the dominant iron-oxidizing bacteria in gold-arsenopyrite and pyrite biooxidation reactors operating at 40 • C [1][2][3][4][5][6]. One of the major factors that determines the dominance of particular microorganisms in the commercial bioleaching operations is the ratio of ferric/ferrous ions (related to the redox potential).…”

Section: Introductionmentioning

confidence: 99%

“…ferrooxidans, Leptospirillum ferrooxidans is found to be resistant even to 500 mM ferric iron concentration [7]. Both L. ferrooxidans and L. ferriphilum can oxidize ferrous iron even at a pH as low below 1.0 and up to 40 • C temperature [6,[8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Bioleaching of Sulfide Minerals by Leptospirillum ferriphilum CC from Polymetallic Mine (Armenia)

et al. 2023

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A strain of Leptospirillum sp. CC previously isolated from Akhtala polymetallic ore (Armenia) was studied. The main morphological and physiological characteristics of CC were revealed. The optimal growth temperature was 40 °C and optimal pH 1.5. A phylogenetic analysis based on 16S rRNA gene sequences (GenBank ID OM272948) showed that isolate CC was clustered with L. ferriphilum and possessed 99.8% sequence similarity with the strain L. ferriphilum OL12-2 (KF356024). The molar fraction of DNA (G+C) of the isolate was 58.5%. Bioleaching experiment indicates that L. ferriphilum CC can oxidize Fe(II) efficiently, and after 17 days, 44.1% of copper and 91.4% of iron are extracted from chalcopyrite and pyrite, respectively. The efficiency of L. ferriphilum CC in pyrite oxidation increases 1.7 times when co-cultivated with At. ferrooxidans ZnC. However, the highest activity in pyrite oxidation shows the association of L.ferriphilum CC with heterotrophic Acidocella sp. RBA bacteria. It was shown that bioleaching of copper and iron from chalcopyrite by association of L. ferriphilum CC, At. ferrooxidans ZnC, and At. albertensis SO-2 in comparison with pure culture L. ferriphilum CC for 21 days increased about 1.2 and 1.4–1.6 times, respectively.

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Micro-biophysical interactions at bacterium-mineral interfaces determine potassium dissolution

Han,

Zhu,

Ruan

et al. 2024

Environmental Technology & Innovation

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Biodissolution of pyrite and bornite by moderate thermophiles

Cited by 4 publications

References 50 publications

Sulfur enhancement effects for uranium bioleaching in column reactors from a refractory uranium ore

Sulfur enhancement effects for uranium bioleaching in column reactors from a refractory uranium ore

Bioleaching of Sulfide Minerals by Leptospirillum ferriphilum CC from Polymetallic Mine (Armenia)

Micro-biophysical interactions at bacterium-mineral interfaces determine potassium dissolution

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