FEMS Microbiology Reviews 20 () ^ Bioleaching: metal solubilization by microorganisms Klaus Bosecker * Federal Institute for Geosciences and. RRM LITERATURE REVIEW THIOBACILLUS-FERROOXIDANS THIOBACILLUS- THIOOXIDANS MICROORGANISMS BIOLEACHING METAL SOLUBILIZATION. From: Bioleaching: metal solubilization by microorganisms Figure 2 Bacterial leaching of uranium ore in shaking flasks. Extraction of uranium during leaching.

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The function of leaching bacteria is addition of acid [32].

From: Bioleaching: metal solubilization by microorganisms – ppt download

These data add significant new information on bacteria which survive in extremely acidic conditions. Conference Bacterial Leaching Schwartz, W.

The ferrous iron arising in surface, and the oxidation to sulfate takes place metall this reaction can be reoxidized to ferric iron by several enzymatically catalyzed steps. In some cases, chemical leaching is Bacillus and Pseudomonas. Australian Academy of Science, Canberra.

The The adjustment of the correct pH value is a neces- authors have indications that pyrite is degraded to sary condition for the growth of the leaching bacte- sulfate via thiosulfate in a cyclic mechanism.

In some heap leaching operations, pipes are placed in strategic positions within the doned mines. Bioleaching as far as the recovery of valuable met- Symp. Published by Elsevier Science B. In general the mineral nutrients leaching bacteria, can be achieved by external addi- are obtained from the environment and from the tion of acid, but this may not only cause the forma- material to be leached. Bioleaching has also some potential for metal recovery and detoxification of industrial waste products, sewage sludge and soil contaminated with heavy metals.


Biolecahing the price of gold has risen many mineral companies now take 6. This microorgan- which are excreted into the culture medium and dis- ism tolerates lower pH values and higher concentra- solve heavy metals by direct displacement of metal tions of uranium, molybdenum and silver than T.

Preparation of dumps for leaching. A de- crease in the particle size means an increase in the 4.

Bioleaching: metal solubilization by microorganisms | sathya jaganathan –

In the laboratory this can be achieved by aer- on the interaction of biological and chemical oxida- ation, stirring, or shaking. Future aspects production of uranium from the Stanrock Mine was about 50 kg U3 O8 whereas 60 kg U3 O8 was At present, bioleaching is being used commercially produced in the Milliken Mine after improvement of only for the recovery of copper, uranium and gold.

Industrial leaching processes Fig. SalgadoPaulo S. Bauxite dressing bacteria and fungi.

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An excellent overview of the current the genus Sulfolobus are aerobic, facultatively chem- knowledge of this species was provided by Leduc olithotrophic bacteria oxidizing ferrous iron, elemen- and Ferroni [6]. The procedures are operation [53,54].

However, referring to newest publications by Sand 4. McGraw-Hill, Ham- bacterial leaching patterns by Thiobacillus ferrooxidans on burg.


This has become a serious economic and environmental challenge because the ores used for steel production are nonrenewable resources and the production generates huge amount of waste.

Carbon dioxide is the only carbon source direct and the indirect leaching, will undoubtedly required, but there is no need for addition of CO2. Similar procedures nickel is dissolved by organic acids produced by mi- are being investigated for the extraction of silver and croorganisms.

On a technical scale, par- tion processes. At various distances most column systems have devices for tak- ing samples or for installing special instruments for measuring temperature, pH, humidity, oxygen or carbon dioxide.

From: Bioleaching: metal solubilization by microorganisms

In this study, we identified and investigated the ability of bacteria from steelmaking waste with low and high zinc concentration to promote leaching of zinc, when enriched by acidic pH 2 culture conditions. So- lutions containing the appropriate bacteria are injected into boreholes in the fractured orebody.

Uranium a second look at microorganismw that were once considered uneconomical. This technology level and Denison Mines have stopped production. John Wiley [56] Morin, D.