Study on Selective Depression of Pyrite during Copper Bioleaching

Ruan, Ren Man; Zhou, Gui Ying; Wen, Jian Kang

doi:10.4028/0-87849-452-9.172

Cited by 1 publication

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“…In real heap leaching environments, the ratio of CO 2 /O 2 consumed was approximately 10 times greater than that in air, so the availability of carbon dioxide was likely to become limiting to microbial growth before the availability of oxygen becomes limiting [22]. Sometimes, if the oxidation process was too fast, like high pyrite-bearing copper sulfide ores, lots of iron would be leached if the process was not controlled [23]. So, the present work examined the effect of CO 2 and N 2 on column bioleaching of a high pyrite-bearing chalcocite ore in order to acquire information on the control of microbial community structure during bioleaching.…”

Section: Discussionmentioning

confidence: 99%

Effect of CO2 and N2 on microbial community changes during column bioleaching of low-grade high pyrite-bearing chalcocite ore

Chen

Liu

et al. 2015

J. Cent. South Univ.

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Simulated heap bioleaching of low-grade high pyrite-bearing chalcocite ore was conducted at 40 °C with aeration of CO 2 and N 2 . Ore samples were collected at day 43, 64, 85, 106 and subjected to microbial community analysis by 16S rRNA gene clone library. Phylogenetic analyses of 16S rDNA fragments revealed that the retrieved sequences are mainly related to genus Acidithiobacillus, Leptospirillum and Sulfobacillus. Aeration of CO 2 and N 2 significantly impacted the microbial community composition. When CO 2 was aerated, the proportion of genus Acidithiobacillus considerably increased, whereas the proportion of genus Leptospirillum and genus Sulfobacillus declined. However, with the aeration of N 2 , the proportion of genus Acidithiobacillus and Leptospirillum increased, but genus Sulfobacillus decreased. When there was no aeration, the microbial community was similar to the inocula with the proportion of genus Leptospirillum mounted. These results indicated that the limitation of oxygen could change the bioleaching microbial community and the aeration of CO 2 and N 2 was favourable for the growth of sulfur-oxidizer (At. caldus) and iron-oxidizer (L. ferriphilum) respectively, which could be used for the regulation of microorganisms' role in mineral bioleaching.

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Section: Discussionmentioning

confidence: 99%