In situ characterization of natural pyrite bioleaching using electrochemical noise technique

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• 作者：Guo-bao Chen ; Hong-ying Yang ; Hai-jun Li
• 关键词：bioleaching ; pyrite ; electrochemical noise ; biological oxidation ; chemical oxidation
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：23
• 期：2
• 页码：117-126
• 全文大小：2,270 KB
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• 作者单位：Guo-bao Chen (1)
  Hong-ying Yang (1)
  Hai-jun Li (1)
  
  1. School of Metallurgy, Northeastern University, Shenyang, 110819, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X

文摘

An in situ characterization technique called electrochemical noise (ECN) was used to investigate the bioleaching of natural pyrite. ECN experiments were conducted in four active systems (sulfuric acid, ferric-ion, 9k culture medium, and bioleaching solutions). The ECN data were analyzed in both the time and frequency domains. Spectral noise impedance spectra obtained from power spectral density (PSD) plots for different systems were compared. A reaction mechanism was also proposed on the basis of the experimental data analysis. The bioleaching system exhibits the lowest noise resistance of 0.101 MΩ. The bioleaching of natural pyrite is considered to be a bio-battery reaction, which distinguishes it from chemical oxidation reactions in ferric-ion and culture-medium (9k) solutions. The corrosion of pyrite becomes more severe over time after the long-term testing of bioleaching. Keywords bioleaching pyrite electrochemical noise biological oxidation chemical oxidation