Biomining and Bioleaching SARDAR HUSSAIN In . Bioleaching where microorganisms are used to facilitate the mining of metals. For biomining specialized microorganisms are used in order to recover valuable metals from ores via bioleaching. Important leaching bacteria are aerobic. Microbial Leaching (Bioleaching, Biomining). Microbial leaching is the process by which metals are dissolved from ore bearing rocks using microorganisms.
|Published (Last):||13 January 2012|
|PDF File Size:||5.38 Mb|
|ePub File Size:||3.9 Mb|
|Price:||Free* [*Free Regsitration Required]|
Biomining is the use of microorganisms to leach metals from their growth medium.
From Wikipedia, the free encyclopedia. These microorganisms over time have developed metabolic networks that can utilize hydrocarbons such as oil and petroleum as a source of carbon and energy. Implementation of biological and chemical techniques biolsaching recover metals from copper-rich leach solutions.
What role does recycling play in our metal supply? The process for copper is very similar, but the efficiency and kinetics depend on the copper mineralogy.
Via targeted research and further development of bioleaching valuable substances such as economically critical metals could be recovered from mine waste dumps mine tailingscomplex ores, non-sulfidic bioleachinf such as laterites and manganese nodules, as well as industrial residues such as ashes, sludges, slags and even electronic waste.
Populations of bacteria and archaea were used to rejuvenate the coast after the oil spill.
Two electron acceptors can influence this process: Aspergillus niger can produce some organic acids such as citric acid. Applied and Environmental Microbiology. This yields soluble products that can be further purified and refined to yield the desired metal. The byproducts of the bacterial growth caused the media to turn very acidic, in which the microorganisms still thrived.
From in situ mining to mineral processing and treatment technology, biomining provides innovative and cost-effective industrial solutions. Fundamental and Applied Aspects”.
Biomining is an environmentally friendly technique compared to typical bio,ining. Treating the mixture with sodium cyanide in the presence of free oxygen dissolves the gold. However, the concentration of gold in its ore is in general very low.
Biomining – Wikipedia
This research often results in technology implementation for greater efficiency and productivity or novel solutions to complex problems. Adding concentrated acid reverses the equation, and the copper ions go back into an aqueous solution.
The copper is removed by bonding to a ligand, which is a large molecule consisting of a number of smaller groupseach possessing a lone electron pair. In this case, the lower cost of bacterial leaching outweighs the time it takes to extract the metal. There is a limited amount of bioleacuing. The potential applications of biomining are countless.
Some examples of past projects in biotechnology include a biologically assisted in situ mining program, biodegradation methods, passive bioremediation of acid rock drainage, and bioleaching of ores and concentrates.
Biomining: metal recovery from ores with microorganisms.
Companies can bioleadhing grow large chemostats of microbes that are leaching metals from their media, these vats of culture can then be transformed into many marketable metal compounds. As a consequence of the microbial activity energy producing reaction:. Please discuss this issue on the article’s talk page. Composition EcoMetals – Innovative eco-efficient biohydrometallurgy process for the recovery of strategic and rare metals: In Temple’s experiment, A.
Views Read Edit View history. What are the environmental risks of biomining?
Metal Bioleaching (Biomining)
Bacteria can mine for metals, clean oil spills, purify gold, and use radioactive elements for energy. He discovered that the bacteria grew faster and were more motile in high iron concentrations. The gold is removed from the solution by adsorbing taking it up on the surface to charcoal.
Today the recovery of copper from sulfide ores is the most important industrial application, and a significant proportion of the world copper production originates from heap or dump bioleaching. These organisms secrete different organic compounds that chelate metals from the environment and bring it back to the cell where they are typically used to coordinate electrons.