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Mineral and iron oxidation at low temperatures by pure and ...

Aug 01, 2007· Mineral and iron oxidation at low temperatures by pure and mixed cultures of acidophilic microorganisms. Dopson M(1), Halinen AK, Rahunen N, Ozkaya B, Sahinkaya E, Kaksonen AH, Lindström EB, Puhakka JA. Author information: (1)Department of Molecular Biology, Umeå University, SE-901 87 Umeå, Sweden. [email protected]

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(PDF) Role of Microorganisms in Banded Iron Formations ...

Role of Microorganisms in Banded Iron Formations. Download. Related Papers. Biogenic Fe (III) minerals: from formation to diagenesis and preservation in the rock record. By Andreas Kappler. Simulating Precambrian banded iron formation diagenesis. By …

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Biobeneficiation of Iron Ores

Jan 02, 2012· Utilization of aerobic and anaerobic microorganisms in iron ore beneficiation is discussed. Microorganisms such as Paenibacillus polymyxa, Bacillus subtilis, Saccharomyces cerevisiae (yeast) and Desulfovibrio desulfuricans (SRB) are capable of significantly altering the surface chemical behavior of iron ore minerals such as hematite, corundum, calcite, quartz and apatite.

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Isolation, identification and characterization of some ...

Iron ore samples were collected using some clean dry and sterile polythene bag along with sterile spatula. 50g of the iron ore samples were dissolving in 100ml of distilled water to make iron ore suspensions and kept on an incubator shaker for 7days. Isolation of iron ore bacteria 50g of each sample of Agbaja iron ore sample was introduced

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An Archaeal Iron-Oxidizing Extreme Acidophile Important in ...

Mar 10, 2000· A new species of Archaea grows at pH ∼0.5 and ∼40°C in slime streamers and attached to pyrite surfaces at a sulfide ore body, Iron Mountain, California. This iron-oxidizing Archaeon is capable of growth at pH 0. This species represents a dominant prokaryote in the environment studied (slimes and sediments) and constituted up to 85% of the microbial community when solution …

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Iron in primeval seas rusted by bacteria -- ScienceDaily

Apr 23, 2013· So the very oldest banded iron formations cannot be the result of O 2-dependent oxidation. In 1993, bacteria were discovered which do not need oxygen but …

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Isolation, identification and characterization of some ...

Nov 03, 2016· Isolation of iron ore bacteria. 50g of each sample of Agbaja iron ore sample was introduced into a conical flask containing 100ml of distilled water. The pH was adjusted to between 2.0-5.0 using 0.1ml of concentrated sulphuric acid (H 2 SO …

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Acid mine drainage - microbewiki

Aug 26, 2010· The general agreement among scientists of microbial-induced pyrite oxidation is that these microorganisms raising the amount of available ferric iron which increases the rate of pyrite oxidation. Acidithiobacillus ferrooxidans, for example, use reduced ferrous iron in AMD areas as an electron donor for energy creation at low pH.

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Iron in primeval seas rusted by bacteria - Phys.org

Apr 25, 2013· So the very oldest banded iron formations cannot be the result of O2-dependent oxidation. In 1993, bacteria were discovered which do not need oxygen but …

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Methods of Metal Recovery by Microorganisms (2 Methods)

Thiobacillus ferrooxidans is a rod-shaped, motile, non-spore forming, Gram-negative bacterium. It derives energy for growth from the oxidation of iron or sulfur. This bacterium is capable of oxidising ferrous iron (Fe 2+) to ferric form (Fe 3+), and converting sulfur (soluble or insoluble sulfides, thiosulfate, elemental sulfur) to sulfate (SO ...

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CHAPTER FIVE 5. CULTURABLE MICROORGANISMS …

5.2.3 Isolation of bacteria from iron ore samples A 5000-g sample of the iron ore materials was added to 1 L of de-ionised water inside autoclaved 2-litre beakers under sterile conditions and this was replicated three times for each mineral type.

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California Researchers Accidentally Discover Metal Eating ...

Jul 17, 2020· Iron-Respiring Bacteria. ... capable of depositing some of the world's largest sedimentary iron ore deposits, known as banded iron formations. By oxidizing iron, these microorganisms …

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A Prelimary Molecular Approach for Characterizing ...

microorganisms act on mineral deposits, as a catalyst and speed up natural processes inside the ore. The bacteria use a chemical reaction called oxidation to turn metal sulphide or oxides crystals into sulphates/oxalates and pure metals (Straub and Skink, 2001). Bioleaching involves numerous ferrous iron and sulphur oxidizing bacteria.

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Phylogeny of Microorganisms Populating a Thick, Subaerial ...

Sep 01, 2000· Nearest relatives to the majority of sequences came from iron-oxidizing acidophiles, and it appears that iron oxidation is the predominant metabolic characteristic of the organisms in the slime. The most abundant of the 16S rRNA genes detected were from organisms related toLeptospirillum species. The dominant sequence (71% of clones) may ...

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Mobilization of phosphorus from iron ore by the bacterium ...

Buis, 1995) and iron-oxidizing bacteria (He and Wei, 2000). Het-erotrophic phosphate bioleaching from an iron slag using the bac-terium Frateuria aurantia has been reported by Pradhan et al. (2004). The organisms used in these previous studies were mostly isolated from sources other than the ore to be treated. From a prac-

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Microbial community study of the iron ore concentrate of ...

However, the low quality iron ore stockpiles of the Sishen Iron Ore Mine are increasing, and it is therefore essential to develop an economical, environmentally friendly process to treat the iron ore concentrates that contain high concentrations of P and K. Microorganisms are capable of converting nutrients in their surrounding environment to

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Biomineralization of Iron ore Tailing soil with Iron ...

iron-oxidizing bacteria. Flowering pots and soil were artificially contaminated with iron ore 50g were mixed in 1.5kg of soil. The soil sample was inoculated with an enhanced culture prepared in 3 pots for plant growth. The analysis took place on days 0, 15, 30, 45, and day 60, respectively.

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microorganisms capable of oxidizing iron ore

Iron in Primeval Seas Rusted by Bacteria . 23, 2013 — Researchers from the University of Tübingen have been able to show for the first time how microorganisms contributed to the formation of the world's biggest iron ore deposits. The biggest known deposits ... or by the action of microaerophilic iron-oxidizing bacteria. But scientists are still debating at ...

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Accelerating microbial iron cycling promotes re ...

Accelerating microbial iron cycling promotes re-cementation of surface crusts in iron ore regions Emma J. Gagen,1,2* Alan Levett,1,† Anat Paz,1 Heike Bostelmann,1 Rafael Borges da Silva Valadares,3 Jose Augusto Pires Bitencourt, 3 Markus Gastauer,3 Gisele Lopes Nunes,3 Guilherme Oliveira,3 Paulo M. Vasconcelos,1 Gene W. Tyson2,‡ and Gordon Southam1 1School of Earth and Environmental ...

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International Journal of Biotechnology and Bioengineering

to form sulfate. Leptospirillum sp. is solely capable of oxidizing Fe2+ ions to form Fe3+. These autotrophic microorganisms utilize the energy and reducing power derived from iron and or sulfur oxidation for several metabolic processes, including CO2 fixation and acquisition of several sources of nitrogen (Pandey and Pandey, 2011).

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Innovations in Copper: Mining & Extraction: Producing ...

Bioleaching involves the use of microorganisms to catalyze the oxidation of iron sulfides to create ferric sulfate and sulfuric acid. Ferric sulfate, which is a powerful oxidizing agent, then oxidizes the copper sulfide minerals and the copper contained is then leached by the sulfuric acid formed. In the case of uranium, the ferric sulfate ...

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Acidithiobacillus - Wikipedia

Acidithiobacillus is a genus of the Acidithiobacillia in the "Proteobacteria".The genus includes acidophilic organisms capable of iron and/or sulfur oxidation. Like all "Proteobacteria", Acidithiobacillus spp. are Gram-negative.They are also important generators of acid mine drainage, which is a major environmental problem around the world in mining.

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16.6A: Microbial Ore Leaching - Biology LibreTexts

Jan 03, 2021· Bacteria perform the key reaction of regenerating the major ore oxidizer which in most cases is ferric iron as well as further ore oxidation. The reaction is performed at the bacterial cell membrane. In the process, free electrons are generated and used for the reduction of oxygen to water which produces energy in the bacterial cell.

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EXTRACTION AND BIOCHEMICAL CHARACTERIZATION OF A …

The Agbaja mine is a large iron mine located in the central Nigerian state of Kogi. Agbaja represents one of the largest iron ore reserves in Nigeria and the world having estimated reserves of about 1.25 billion tonnes of ore capable of yielding about 48% of iron metal. (Alafara, 2003). There are a number of researches ongoing on the best ...

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Application of biotechnology in iron ore beneficiation ...

Jan 01, 2015· The sulfur-oxidizing bacteria are not as sensitive to organic matter as the iron-oxidizing bacteria and either used the organic matter as a carbon source or were not inhibited by its presence. Between 83% and 87% of the phosphorus was bioleached from the iron ore in both experiments ( Shen et al., 2012, Xiao et al., 2013 ).

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Gold Dissolution from Ore with Iodide-Oxidising Bacteria ...

Mar 12, 2019· Gold leaching from ore using iodide-iodine mixtures is an alternative to gold cyanidation. This study evaluated the ability of iodide-oxidising bacteria to solubilise gold from ore that was mainly ...

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Iron Bacteria | Article about Iron Bacteria by The Free ...

Iron Bacteria. bacteria that are able to oxidize ferrous iron compounds and to use the energy thus liberated to assimilate carbon from carbon dioxide or carbonates. The equation for the oxidation is. 4Fe (HCO3) 2 + 6H 2 O + O 2 = 4Fe (OH)3 +4H2 CO 3 + 4CO2. In this reaction a small amount of energy is liberated; there-fore, iron bacteria ...

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Reduction of Iron(III) Ions at Elevated Pressure by ...

A composed mixed acidophilic, iron-oxidizing culture (FIGB) and a thermo-acidophilic enrichment culture (TK65) were used to evaluate microbial iron(III) reduction coupled to oxidation of reduced inorganic sulfur compounds (RISCs) under high pressure. Experiments were done in batch culture in high pressure vessels at 1 and 100 bar. Microbial abundance and activity were determined by measuring ...

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