What is bioleaching PDF?
Bioleaching is the extraction of metals from their ores through the use of living organisms. • This is much cleaner than the traditional heap leaching using cyanide.
What are commercial methods of bioleaching?
Commercial Processes: Methods described below are generally employed in large scale bioleaching processes: (a) Slope Leaching: In this method finely powdered ore, approximately 10,000 tons are made into large piles along the slopes of a mountain, and water containing Thiobacillus is continuously sprinkled.
What is bioleaching in biotechnology?
Bioleaching is a part of microbial mining. In microbial leaching or bioleaching metals can be extracted from large quantities of low grade ores This process has been used for centuries to recover copper form the drainage water of mines the role of microbes in the bioleaching came into notice some 40 years ago.
What are the applications of bioleaching?
Bioleaching is one of several applications within biohydrometallurgy and several methods are used to recover copper, zinc, lead, arsenic, antimony, nickel, molybdenum, gold, silver, and cobalt.
Which microorganisms are used in bioleaching?
Acidithiobacillus ferrooxidans, Acidithiobacillus caldus, Acidithiobacillus thiooxidans, and Acidithiobacillus ferrivorans are the well-known and widely studied microorganism for bioleaching due to their capability to oxidize the sulfidic minerals (Johnson, 2014).
What are the factors affecting bioleaching?
4 Factors influencing bioleaching
- 4.1 Nutrients.
- 4.2 O2 and CO.
- 4.3 pH.
- 4.4 Temperature.
- 4.5 Mineral substrate.
- 4.6 Heavy metals.
- 4.7 Surfactants and organic extractants.
Where is bioleaching used?
Bioleaching is used today in commercial operations to process ores of copper, nickel, cobalt, zinc and uranium, whereas, biooxidation is used in gold processing and coal desulfurization. Bioleaching involves the use of microorganisms to catalyze the oxidation of iron sulfides to create ferric sulfate and sulfuric acid.
What are the different types of bioleaching?
1. DEFINITION OF BIOLEACHING MICROORGANISMS USED IN BIOLEACHING CHEMISTRY OF BIOLEACHING TYPES EXAMPLES 1. COPPER LEACHING 2. URANIUM LEACHING 3. GOLD AND SILVER LEACHING 4. SILICA LEACHING 2. Bioleaching is the process by which metals are dissolved from ore bearing rocks using microorganisms. 3.
What are the applications of microbial leaching?
18. Microbial leaching of refractory process metal ores to enhance gold and silver recovery is one of the promising applications Gold is obtained through bioleaching of arsenopyrite/pyrite Silver is also obtained by bioleaching of arsenopyrite but it is more readily solubilized than gold during microbial leaching of iron sulphide. 19.
What are the different types of leaching?
URANIUM LEACHING 3. GOLD AND SILVER LEACHING 4. SILICA LEACHING 2. Bioleaching is the process by which metals are dissolved from ore bearing rocks using microorganisms. 3.
What is the kinetics of bioleaching?
Bioleaching kinetics – The rate of bacterial oxidation is higher than that of chemical oxidation under Subprocesses in biooxidation. Growth bacteria. Ferrous to ferric oxidation Fe2 The rate of bacterial oxidation is higher than that of chemical oxidation under Subprocesses in biooxidation. Growth bacteria.