Thermoacidophilic microbial community oxidizing the gold-bearing flotation concentrate of a pyrite-arsenopyrite ore

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• 作者：A. E. Panyushkina ; I. A. Tsaplina ; N. V. Grigor’eva ; T. F. Kondrat’eva
• 关键词：flotation concentrate of a gold ; bearing sulfide ore ; thermoacidophilic microbial communities ; species composition of ACM communities
• 刊名：Microbiology
• 出版年：2014
• 出版时间：September 2014
• 年：2014
• 卷：83
• 期：5
• 页码：539-549
• 全文大小：1,958 KB
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• 作者单位：A. E. Panyushkina (1)
  I. A. Tsaplina (1)
  N. V. Grigor’eva (1)
  T. F. Kondrat’eva (1)
  
  1. Winogradsky Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 2, Moscow, 117312, Russia
  
• ISSN：1608-3237

文摘

An aboriginal community of thermophilic acidophilic chemolithotrophic microorganisms (ACM) was isolated from a sample of pyrite gold-bearing flotation concentrate at 45-7°C and pH 1.8-.0. Compared to an experimental thermoacidophilic microbial consortium formed in the course of cultivation in parallel bioreactors, it had lower rates of iron leaching and oxidation, while its rate of sulfur oxidation was higher. A new thermophilic acidophilic microbial community was obtained by mutual enrichment with the microorganisms from the experimental and aboriginal communities during the oxidation of sulfide ore flotation concentrate at 47°C. The dominant bacteria of this new ACM community were Acidithiobacillus caldus (the most active sulfur oxidize) and Sulfobacillus thermotolerans (active oxidizer of both iron and sulfur), while iron-oxidizing archaea of the family Ferroplasmaceae and heterotrophic bacteria Alicyclobacillus tolerans were the minor components. The new ACM community showed promise for leaching/oxidation of sulfides from flotation concentrate at high pulp density (S : L = 1 : 4).