Thermoacidophilic microbial community oxidizing the gold-bearing flotation concentrate of a pyrite-arsenopyrite ore
| Autor: | Iraida A. Tsaplina, N. V. Grigor’eva, Tamara F. Kondrat'eva, A. E. Panyushkina |
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| Rok vydání: | 2014 |
| Předmět: |
Arsenopyrite
chemistry.chemical_classification Sulfobacillus thermotolerans Sulfide ved/biology Thermophile ved/biology.organism_classification_rank.species chemistry.chemical_element Microbial consortium engineering.material Biology Applied Microbiology and Biotechnology Microbiology Sulfur chemistry visual_art Environmental chemistry visual_art.visual_art_medium engineering Pyrite Leaching (metallurgy) |
| Zdroj: | Microbiology. 83:539-549 |
| ISSN: | 1608-3237 0026-2617 |
| Popis: | An aboriginal community of thermophilic acidophilic chemolithotrophic microorganisms (ACM) was isolated from a sample of pyrite gold-bearing flotation concentrateat 45-47 degrees C and pH 1.8-2.0. 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 micioorganisms from thie experimental and aboriginal communities during oxidation of sulfide ore flotation concentrate at 47 degrees C. The dominant bacteria of this new ACM community were Acidithiobacillus caldus strains (the most active sulfur oxidizers) and Sulfobacillus thermotolerans strains (active oxidizers 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 concentrates at high pulp density (S:L = 1:4). |
| Databáze: | OpenAIRE |
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