This study focused on the acidophilic microbial dissolution process of stibnite and investigated the effect of different pro-portions of pyrite on the interaction between acidophilic microorganisms and stibnite.The results showed that the Proteobacteria had the highest abundance at the phylum level,it was the main stibnite-tolerant bacterium.Acidithiobacillus had the highest level of abundance at the genus level,which was the representative dominant genus in acid mine environments.Additionally,SEM-EDS results showed that for microbial action systems with Sb2 S3∶FeS2 1∶1 and 1∶2,more corrosion pits and fine particles were found on the surface of mineral residues,and for the microbial action system with Sb2 S3∶FeS2 1∶1,the interfacial reaction between stibnite and pyrite was stronger.XRD and XPS results indicated that the addition of pyrite could promote the oxidative decomposition of stibnite and sulfur oxi-dation by acidophilic microorganisms.Tafel polarization curves and EIS impedance results showed that when Sb2S3∶FeS2 was 1∶1,the microbial system had the highest corrosion current density and the smallest charge-transfer impedance.The above results were of great significance for understanding the migration,transformation,and environmental fate of stibnite in antimony mining areas,and further pro-moting the development of antimony pollution control technologies.
stibnitepyriteacidophilic microorganismsmineral-microbe interactionmicrobial community
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