Study on the effect of different proportions of pyrite on the interaction between acidophilic microorganisms and stibnite
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
万方数据
维普
