This document summarizes bioleaching, which uses microorganisms to extract metals from minerals and ores. It discusses the history of bioleaching and microorganisms used, including Thiobacillus ferrooxidans and Leptospirillum ferrooxidans. Direct bacterial leaching involves dissolution of the metal directly by bacterial activity, while indirect leaching uses bacteria to generate acidity or solubilize the metal. Examples of direct and indirect leaching include uranium extraction. Commercial bioprocesses include heap, in situ, and copper leaching. Key factors that affect bioleaching are temperature, pH, microbial diversity, population density, and physicochemical conditions.

1. Submitted for self study evaluation for the course
“Mass transfer - 2”
Fifth Semester, Chemical Engineering - 2016
Submitted
by :
Sirajudheen K V Manikandan R
1RV13CH032 1RV15CH402

2. SYNOPSIS
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3. BIOLEACHING
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4. HISTORY
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5. MICROORGANISMS USED IN
BIOLEACHING

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FEATURES OF ORGANISMS
INVOLVED

8. CHEMISTRY OF BIOLEACHING
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9. DIRECT BACTERIAL LEACHING
INDIRECT BACTERIAL LEACHING

10. AN EXAMPLE F0R DIRECT
BACTERIAL LEACHING AND
INDIRECT BACTERIAL LEACHING :
Extraction of uranium
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11. COMMERCIAL PROCESS OF
BIOLEACHING
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12. HEAP LEACHING
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14. IN SITU BIOLEACHING
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16. COPPER LEACHING
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19. REACTIONS
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21. MAIN FACTORS AFFECTING
BIOLEACHING
Physicochemical
Temperature, pH
Microbiological
Microbial diversity culture
Population density

22. BENEFITS OF BIOLEACHING
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23. DISADVANTAGES
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24. REFERENCES