Bioleaching is the extraction of specific metal s from their ore s through the use of living organism s. This is much cleaner than the traditional heap leaching using cyanide. ref http ngm.nationalgeographic.com 2009 01 gold larmer text 5 Flotation technique cleaner than heap leaching ref 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 . The process Bioleaching can involve numerous ferrous iron and sulfur oxidizing bacteria, including Acidithiobacillus ferrooxidans and Acidithiobacillus formerly known as Thiobacillus . As a general principle, Fe sup 3 sup ions are used to oxidize the ore. This step is entirely independent of microbes. The role of the bacteria is the further oxidation of the ore, but more importantly also the regeneration of the chemical oxidant Fe sup 3 sup from Fe sup 2 sup . For example, bacteria catalyst catalyse the breakdown of the mineral pyrite FeS sub 2 sub by oxidising the sulfur and metal in this case ferrous ... above can be applied to other sulfidic ores. Bioleaching of non sulfidic ores such as pitchblende ... is removed from the solution by adsorption adsorbing taking it up on the surface to charcoal . Bioleaching with fungi Several species of fungi can be used for bioleaching. Fungi can be grown on many ... s out of the solution after the bacteria have finished. Some advantages associated with bioleaching are Economics economical bioleaching is generally simpler and therefore cheaper to operate and maintain ... cultivated and recycling recycled . Some disadvantages associated with bioleaching are economical ..., a setup of bioleaching must be carefully planned, since the process can lead to a biosafety failure. Currently it is more economical to smelt copper ore rather than to use bioleaching, since the concentration ... Category Metallurgical processes ar ca Biolixiviaci de Bioleaching pl Bio ugowanie ... more details
Other uses Leaching disambiguation Leaching In pedology soil study pedology , leaching is the loss of mineral and organic solutes due to percolation . It is a mechanism of pedogenesis soil formation . It is distinct from the soil forming process of eluviation , which is the loss of mineral and organic colloids . Leached and elluviated materials tend to be lost from topsoil and deposited in subsoil . A soil horizon accumulating leached and eluviated materials is referred to as a zone of illuviation . See also Bioleaching Biomineralisation Leaching agriculture Groundwater recharge Soil salinity control Category Economic geology Category Sedimentology Category Soil science de Auswaschung et Leostumine zh ... more details
wiktionary In general, leaching is the extraction of certain materials from a carrier into a liquid usually, but not always a solvent . Specifically, it may refer to Leaching agriculture , the loss of water soluble plant nutrients from the soil or applying a small amount of excess irrigation to avoid soil salinity Leaching chemistry , the process of extracting minerals from a solid by dissolving them in a liquid Leaching metallurgy , a widely used extractive metallurgy technique which converts metals into soluble salts in aqueous media Dump leaching , an industrial process to extract metals from ore taken directly from the mine and stacked on the leach pad without crushing Heap leaching , an industrial process to extract metals from ore which has been crushed into small chunks Tank leaching , a hydrometallurgical method of extracting valuable material from ore In situ leaching , a process of recovering minerals such as copper and uranium through boreholes drilled into the deposit Leaching pedology , the loss of mineral and organic solutes due to percolation from soil Bioleaching , the extraction of specific metals from their ores through the use of bacteria In cooking, leaching generally refers to Parboiling . See also Leachate , the liquid that drains or leaches from a landfill Leach disambiguation Leech disambiguation disambig ca Lixiviaci ... more details
Geomicrobiology is the result of the combination of geology and microbiology . The field of geomicrobiology concerns the role of microbe and microbial processes in geological and Geochemistry geochemical processes and vice versa. The field is especially important when dealing with microorganisms in aquifer s and public drinking water supplies. Another area of investigation in geomicrobiology is the study of extremophile organisms, the microorganisms that thrive in environments normally considered hostile. Such environments may include extremely hot hot spring s or mid ocean ridge black smoker environments, extremely salinity saline environments, or even space environments such as Mars Martian soil or comet s. Recent observations and research in hyper saline lagoon environments in Brazil and Australia have shown that Anaerobic organism anaerobic sulfate reducing bacteria may be directly involved in the formation of dolomite Fact date July 2008 . This suggests the alteration and replacement of limestone sediments by dolomitization in ancient rocks was possibly aided by ancestors to these anaerobic bacteria. Some bacteria use metal ion s as their energy source. They convert or chemically reduce the dissolved metal ions from one electrical state to another. This reduction releases energy for the bacteria s use, and, as a side product, serves to concentrate the metals into what ultimately become ore deposits . Certain iron , uranium and even gold ore s are thought to have formed as the result of microbe action. Fact date May 2010 Microbes are being studied and used to degrade organic and even nuclear waste pollution see Deinococcus radiodurans and assist in environmental cleanup. It should be stressed however that microorganisms can not decrease the total radioactivity of nuclear waste. An application of geomicrobiology is bioleaching , the use of microbes to extract metals from mining mine waste. See also Acid mine drainage Bacterial oxidation Desulforudis audaxviator E ... more details
bioleaching whereby metals are extracted from their ores through oxidation . The bacteria are used as catalyst ... isolated and enriched. Bioleaching Among the group of Thiobacilli, Thiobacillus ferrooxidans ..., there is one company that has developed and commercialized bioleaching technology for the remediation ... over time. Here, the bioleaching process can stabilize these toxins from minerals and prevent additional ... more details
Biohydrometallurgy is a subfield within hydrometallurgy which includes aspects of biotechnology . Definition Interdisciplinary field involving processes that make use of microbes , usually bacteria and archaea bio mainly take place in aqueous environment hydro deal with metal production and treatment of metal containing materials and solutions metallurgy Biohydrometallurgy may be defined, in very general terms, as that branch of biotechnology dealing with the study and application of the economic potential of the interactions between the microbial world and the mineral kingdom. It concerns, thus, all those engaged, directly or indirectly, in the exploitation of mineral resources and in environmental protection geologists, economic geologists, mining engineers, metallurgists, hydrometallurgists, chemists and chemical engineers. In addition to these specialists, there are the microbiologists whose work is indispensable in the design, implementation and running of biohydrometallurgical processes. ref Rossi, G. 1990 . Biohydrometallurgy, Hamburg McGraw Hill. ISBN 3 89028 781 6 ref Applications Biohydrometallurgy is used to perform processes involving metal s, for example, microbial mining, oil recovery, bioleaching, water treatment and others. Biohydrometallurgy is mainly used to recover certain metals from sulfide ores. It is usually utilized when conventional mining procedures are too expensive or ineffective in recovering a metal such as copper , gold , lead , nickel and zinc . See also Bacterial oxidation External links http wiki.biomine.skelleftea.se wiki index.php Main Page BioMineWiki a wiki on biohydrometallurgy References reflist biotech stub Industry stub Category Metallurgy Category Biotechnology pl Biohydrometalurgia sv Biohydrometallurgi ... more details
NOTOC div style float left width 69 Biotechnology is a technology based on biology , especially when used in agriculture , food science , and medicine . Of the many different definitions available, the one formulated by the UN Convention on Biological Diversity is one of the broadest Biotechnology means any technological application that uses biological systems, living organisms, or derivatives thereof, to make or modify products or processes for specific use. Article 2. Use of Terms div style text align right margin right 10px margin bottom 4px Biotechnology More about Biotechnology... div div div style float right width 29 Biotechnology title MINUTE CURRENTTIME t div br style clear both see also Outline of biotechnology This page provides an alphabetical list of articles and other pages including categories, lists, etc about biotechnology. For other overviews of the topic, please see the Portal Biotechnology Biotechnology portal . A Agrobacterium Affymetrix Alcoholic beverages Category Alcoholic beverages Amgen AnaSpec Antibiotic Artificial selection B Biochemical engineering Biochip Biodiesel Bioengineering Biofuel Biogas Biogen Idec Bioindicator Bioinformatics Category Bioinformatics Bioleaching Biological agent Biological warfare Bioluminescence Biomimetics Bionanotechnology Bionics Biopharmacology Biophotonics Bioreactor Bioremediation Biostimulation Biosynthesis Biotechnology Category Biotechnology Category Biotechnology companies Category Biotechnology products Bt corn BioSynergy C Cancer immunotherapy Cell therapy Chimera genetics Chinese hamster Chinese Hamster Ovary cell Chiron Corp. Cloning Compost Composting Convention on Biological Diversity Chromatography D Directive on the patentability of biotechnological inventions DNA microarray Dwarfing E Enzymes Electroporation Environmental biotechnology Eugenics F fermentation food Fermentation Category Fermented foods G Gene knockout Gene therapy Genentech Genetic engineering Genetically modified food Genetic ... more details
investigation of bioleaching for base metal sulphides. 1993 FloatStar tested on an industrial ... certification. Bioleaching of copper suiphide concentrates demonstrated at Industrials AuTEK Biomedical ... of copper heap bioleaching at Sarcheshmeh Copper Complex, Iran. 2006 LeachStar gold circuit controller ... more details
technique for extracting trace metals through bioleaching , and offers solutions for the phenomenon ... the use of acidophiles, in a process known as bioleaching . Though slower than conventional ... more details
emphasizing the general nature of the problem. Yellow boy This section is linked from Bioleaching ... issues with mining Environment Agency Bioleaching International Mine Water Association References ... more details
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