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Paper Titles
Mechanisms of Bioleaching and the Visualization of these by Combined AFM & EFM
p.297
Understanding and Modelling of Interactions in Bioleach Processes
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From Laboratory to Application Heap Bioleach or not
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Microorganisms in Bioflotation and Bioflocculation: Potential Application and Research Needs
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FISH Analysis of Bacterial Attachment to Copper Sulfides in Bioleaching Processes
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Comparative Study of Planktonic and Sessile Cells from Pure and Mixed Cultures of Acidithiobacillus Ferrooxidans and Acidiphilium Cryptum Growing on Pyrite
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Attachment Behavior of Leaching Bacteria to Metal Sulfides Elucidated by Combined Atomic Force and Epifluorescence Microscopy
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Visualisation of Bacterial Behaviour Using Tapping-Mode Atomic Force Microscopy
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Investigation and Visualisation of Microbial Attachment Trends to Sulphide Minerals in a Bioleach Environment
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FISH Analysis of Bacterial Attachment to Copper Sulfides in Bioleaching Processes

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Abstract:

Bioleaching is the biological conversion of an insoluble metal compound into a water soluble form. In this process metal sulfides are oxidized to metal ions and sulfate by acidophilic microorganisms capable of oxidizing Fe2+ and/or sulfur-compounds. The metal solubilization from sulfide minerals is a chemical process which requires Fe3+ reduction. It is an environmentally friendly technique and an economical method for recovering metals that requires low investment and operation costs. In this work we studied the bioleaching of two kinds of acid-soluble copper sulfides, one easily leached by mesophilic bacteria (covellite), and the other one refractory to their activity (chalcopyrite), in acidic media with or without Fe2+ ions. We studied attached and planktonic populations of autotrophic bacteria, such as Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans and Leptospirillum ferrooxidans in pure or mixed cultures. The influence of a heterotrophic microorganism, Acidiphilium cryptum, was also studied. Attachment was evaluated with fluorescence staining and FISH using four specific probes. L. ferrooxidans showed highest initial attachment in all cases. The presence of Ap. cryptum increased the cell attachment compared with the autotrophic pure cultures. It was possible to correlate experimental data with a mechanism of bacterial-metal sulfide oxidation, the polysulfide pathway for acid- soluble metal sulfides.

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Info:

Periodical:

Advanced Materials Research (Volumes 71-73)

Pages:

329-332

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.71-73.329

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Online since:

May 2009

Authors:

J. Huergo, C. Bernardelli, M. Viera, Wolfgang Sand, Edgardo R. Donati

Keywords:

Acidiphilium, Acidithiobacillus, Bioleaching, Chalcopyrite, Covellite, Fish

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