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Related Experiment Videos

Heavy metal mining using microbes.

Douglas E Rawlings1

  • 1Department of Microbiology, University of Stellenbosch, Private Bag X1, South Africa. der@sun.ac.za

Annual Review of Microbiology
|July 27, 2002
PubMed
Summary
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Acidiphilic microbes are key to biomining, oxidizing metals like copper and gold. Thermophilic microbes offer potential for higher-temperature biooxidation, expanding mineral processing capabilities.

Area of Science:

  • Biotechnology
  • Environmental Science
  • Geochemistry

Background:

  • Biomining utilizes acidiphilic, chemolithotrophic microbes for metal recovery from minerals.
  • Current industrial processes involve oxidizing insoluble metal sulfides to soluble metal sulfates.
  • Microorganisms primarily reoxidize ferrous iron to ferric iron, aiding mineral decomposition.

Purpose of the Study:

  • To explore the potential of thermophilic microbes in biomining.
  • To investigate extending biomining capabilities to higher temperatures.
  • To enhance the variety of commercially processable minerals.

Main Methods:

  • Isolation and characterization of thermophilic iron- and sulfur-oxidizing microbes.
  • Assessing microbial performance at elevated temperatures (80°C and higher).

Related Experiment Videos

  • Evaluating the application of these microbes in mineral biooxidation processes.

    • Main Results:

    • Thermophilic microbes capable of growth at 80°C or higher have been successfully isolated.
    • These thermophilic microbes show potential for high-temperature mineral biooxidation.
    • Higher-temperature processes are expected to broaden the scope of commercially viable biomining.

    Conclusions:

    • Thermophilic microbes represent a significant advancement for biomining technology.
    • Elevated temperature biomining processes will increase the range of treatable minerals.
    • This research paves the way for more efficient and diverse metal recovery.