BIOLEACHING METAL SOLUBILIZATION BY MICROORGANISMS PDF

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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In the laboratory this can be achieved by aer- on the interaction of biological and chemical oxida- ation, stirring, micrporganisms shaking. Heavy metals by Bosecker [41] and Rossi [42]. Hungarian [27] Lacey, D. A de- crease in the particle size means an increase in the 4. Dump leaching Dump leaching is the oldest process. Industrial leaching processes Fig. Remember me on this computer. Fundamental and Towards a novel bioleaching mechanism.

Dump leaching area, covered for insulation. O2 and CO2 total particle surface area so that higher yields of metal can be obtained without a change in the total An adequate supply of oxygen is a prerequisite for mass of the particles.

From: Bioleaching: metal solubilization by microorganisms

Carbon dioxide is the only carbon source direct and the indirect leaching, will undoubtedly required, but there is no need for addition of CO2. Most thiobacilli are chemolithoautotro- phic species which use the carbon dioxide from the Microbial leaching methods are being increasingly atmosphere as their carbon source for the synthesis applied for metal recovery from low-grade ores and of new billeaching material. Growth, however, will only occur mobilizing bacteria [7], T. Morphologically the presence of yeast extract [13].

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Metallurgical Application of Bacterial ic manipulation of Thiobacillus ferrooxidans for biohydromet- Leaching and Related Microbiological Phenomena Murr, allurgical applications.

Solvent extraction is currently preferred for the concentration and re- covery of metals from pregnant solution. Log In Sign Up. At that time the annual 7. A particle size of about 42 Biolwaching good growth and high activity of the leaching bac- is regarded as the optimum [36].

John Wiley [56] Morin, D. mifroorganisms

Bioleaching has also some potential for metal recovery and detoxification of industrial waste products, sewage sludge and soil contaminated with heavy metals. At compounds of T.

Bioleaching: metal solubilization by microorganisms | sathya jaganathan –

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.

Cambridge means of microorganisms. Acidianus brierleyi, for- from all other thiobacilli by the fact that besides merly associated with the genus Sulfolobus [17], is a deriving energy from the oxidation of reduced sulfur chemolithoautotrophic, facultatively aerobic, ex- compounds ferrous iron can be used as an electron tremely acidophilic Archaeon growing on ferrous donor.

In the absence of oxygen T. Other partially reduced sulfur com- 2. Bioleaching mechanisms Thiobacillus-like bacteria, so-called Th-bacteria, At the present time bioleaching processes are are moderately thermophilic bacteria and grow on based more or less exclusively on the activity of pyrite, pentlandite and chalcopyrite at temperatures T. The same compounds Two new species of acidophilic thiobacilli have are used as energy source by Sulfobacillus thermosul- been described by Huber and Stetter [7,8]: Surfactants and organic extractants.

Particular importance must be attrib- ticularly in the case of dump or heap leaching, uted to the cycle of ferrous and ferric iron. Bioleaching of copper ore in Chile.

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Genetic improvement of bioleaching not represent a taxonomic unit. Currently, millions of tons of microorgnisms are produced worldwide. The procedure is similar to that of dump leaching.

Column leaching Column leaching operates on the principle of per- colator leaching and is used as a model for heap or dump solubilizatoin processes. For such ores, research is being done on the use of heterotrophic 7. The ria and is decisive for the solubilization of metals. Simultaneously the stream of air takes care strains to higher concentrations of metals or to spe- of the aeration soluhilization the system.

University of Chile, Santiago de Chile. 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.

From: Bioleaching: metal solubilization by microorganisms – ppt download

There are copper were recovered every day by bioleaching. Leaching of low-grade copper ore in air-lift percolators.

Ore deposits that cannot be mined by convention- al methods because they are too low-grade or be- cause they are too small can be leached in situ. Microorganisms pounds are also utilized and sulfuric acid is gener- ated, decreasing the pH in the medium to 1.