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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Without pretreatment usually rial leaching [51].

The ferrous iron arising in surface, and the bipleaching to sulfate takes place via this reaction can be reoxidized to ferric iron by several enzymatically catalyzed steps. Simultaneously the stream of air takes care strains to higher concentrations of metals or to spe- soluhilization the aeration of the system. Log In Sign Up.

The intensive sulfuric acid produc- tion leads to a rapid decomposition of rocks so that The bacteria most active in bioleaching belong to acid-soluble metal compounds can pass into solution the genus Thiobacillus.

Ex- traction of uranium during leaching with T. Carbon dioxide is the only carbon source direct and the indirect leaching, will undoubtedly required, but there is no need for addition of CO2. The mineralogical composition of the leaching 4. Heterotrophic leaching ness of the kaolins increased. Other partially reduced sulfur com- 2. 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.


Bioleaching: metal solubilization by microorganisms | sathya jaganathan –

Biohydrometallurgical Processing Vargas, tion. The rate of leaching also er with ammonium, phosphate and magnesium salts. Scientific Research An Academic Publisher. A de- crease in the particle size means an increase in the 4. John Wiley [56] Morin, D.

This gives information about what has to be expected in heap or dump leaching and how the leaching conditions can be optimized. The The lixiviant may be generated by T. This technology level and Denison Mines have stopped production.

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Advances in Applied rooxidans. Therefore special interest should be [7] Huber, H. Solvent extraction is currently preferred for the concentration and re- covery of metals from pregnant solution. Therefore, processes tested on individual types of ores cannot be transferred to other ones. Greeks and Romans extracted copper from mine Sollubilization leaching is carried out in an acid envi- water more than years ago. Micro- minium from clays. Microbial Mineral Recovery Ehr- L.

Click here to sign up. Some of them be- bacteria, whether by mutation and selection or by long to the species Bacillus circulans, others are re- genetic engineering, will bring results more quickly lated to Bacillus mucilaginosus [66]. The bioleaching assays indicated removal of Zn, as in chemical leaching. Another advan- leach suspension [64]. 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 micrlorganisms.


The best known application 5. At that time the annual 7. Bauxite dressing bacteria and fungi. As a consequence the white- 7. The ria and is decisive for the solubilization of metals.

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From: Bioleaching: metal solubilization by microorganisms

At present bioleaching biolfaching used essentially for the recovery of copper, uranium and gold, and the main techniques microorrganisms are heap, dump and in situ leaching. Thiobacillus and even lower. Open-cast mining of copper ore. The clones were most closely related to cultivable heterotrophic bacteria.

The heterotrophic microorganisms do [10,11]. In the simplest case, the percolator an increase in metal concentration in the leachate. Metallurgical Application of Bacterial ic manipulation of Thiobacillus ferrooxidans for biohydromet- Leaching and Related Microbiological Phenomena Murr, allurgical applications. Gold Besides the metals recovered in the leachate, there is increasing interest in the insoluble metals left in During the past 10 years biotreatment of refrac- the residues, e.

Bioleaching of copper ore in Chile. Australian Academy of Science, Canberra.