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  • The effect of microorganisms on Fe precipitation rate at ,
    The effect of microorganisms on Fe precipitation rate at ,

    Moreover, a recent study by Kasama and Murakami (2001) documented that, at neutral pH, iron-oxidizing bacteria are capable of increasing the rate of Fe 2+ oxidation by up to four orders of .

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  • The shift of microbial communities and their roles in ,
    The shift of microbial communities and their roles in ,

    Iron and sulfur are major energy sources for microorganisms in copper ore bioleaching system, and bioleaching process always companied with transformation of Fe&S compounds , genera capable of .

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  • Iron ore - Wikipedia
    Iron ore - Wikipedia

    Iron ore being unloaded at docks in Toledo, Ohio Iron ores are rocks and minerals from which metallic iron can be economically extracted The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, or deep purple to rusty red The iron is usually found in the form of magnetite (Fe 3 O 4, 724% Fe), hematite (Fe 2 O 3, 699% Fe), goethite (FeO(OH), 629% Fe .

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  • Methods of Metal Recovery by Microorganisms (2 Methods)
    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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  • Metal-eating microbes in African lake could solve mystery ,
    Metal-eating microbes in African lake could solve mystery ,

    Sep 09, 2015· By oxidizing iron, these microorganisms likely helped shape the chemistry of Earth over billions of years, ultimately leading to the evolution ,

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  • Iron Bacteria - an overview | ScienceDirect Topics
    Iron Bacteria - an overview | ScienceDirect Topics

    Iron bacteria There are several groups of iron bacteria, all of which are capable of abstracting and oxidizing any ferrous and manganous ions present in a water The process is continuous with a large accumulation of rust coloured or black deposits developing over time

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  • A Prelimary Molecular Approach for Characterizing ,
    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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  • Investigation of an Iron-Oxidizing Microbial Mat Community ,
    Investigation of an Iron-Oxidizing Microbial Mat Community ,

    MICROBIAL IRON OXIDATION: FIELD STUDIES 4023 atmosphere have studied the fossilized remains of bacteria akin to modern day iron bacteria for hints about the biogeo- chemistry of the early Earth (19) Thequantitative data from most of these reports have focused on the geochemistry and/or age of the Fe oxides, while microbial studies have been primarily phenomenological, describing some of the .

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  • Fossilized iron bacteria reveal a pathway to the ,
    Fossilized iron bacteria reveal a pathway to the ,

    Jun 20, 2013· Most aerobic iron-oxidizing appendage bacteria escape entombment during growth on iron by discarding their stalks 26, which probably explains why ,

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  • Neutrophilic lithotrophic iron-oxidizing prokaryotes and ,
    Neutrophilic lithotrophic iron-oxidizing prokaryotes and ,

    Biology of lithotrophic neutrophilic iron-oxidizing prokaryotes and their role in the processes of the biogeochemical cycle of iron are discussed This group of microorganisms is phylogenetically, taxonomically, and physiologically heterogeneous, comprising three metabolically different groups: aerobes, nitratedependent anaerobes, and phototrophs; the latter two groups have been revealed .

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  • Iron-oxidizing bacteria - Wikipedia
    Iron-oxidizing bacteria - Wikipedia

    The iron bacteria oxidize ferrous iron to ferric iron by using the derived energy for the chemo-synthetic assimilation of carbon Gallionella, a true iron bacteria , is a rod or kidney-shaped bacteria that secretes long, slender, twisted bands or stalks of ferric hydroxide

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  • Reduction of Iron(III) Ions at Elevated Pressure by ,
    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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  • Application of biotechnology in iron ore beneficiation ,
    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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  • Bioleaching of copper- and zinc-bearing ore using ,
    Bioleaching of copper- and zinc-bearing ore using ,

    Jul 19, 2018· This phenomenon clearly showed that the indigenous iron-oxidizing bacteria had profound effect on the ore particles for copper and zinc bioleaching Sometimes, the changes occur in the position of peaks can attribute to jarosite formation over the ore surface that is an eminent phenomenon (Zhu et al 2011 ; Panda et al 2013a )

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  • Iron in Primeval Seas Rusted by Bacteria | Geology Page
    Iron in Primeval Seas Rusted by Bacteria | Geology Page

    In 1993, bacteria were discovered which do not need oxygen but can oxidize Fe(II) by using energy from light (anoxygenic phototrophic iron-oxidizing bacteria) Studies by Professor Kappler’s team in 2005 and 2010 showed that these bacteria transform dissolved ferric iron into iron oxide (rust) — like the material in the early iron or

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  • Microbial community study of the iron ore concentrate of ,
    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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  • Iron-oxidizing bacteria and similar topics | Frankensaurus
    Iron-oxidizing bacteria and similar topics | Frankensaurus

    Iron-oxidizing bacteria are chemotrophic bacteria that derive the energy they need to live and multiply by oxidizing dissolved ferrous iron , Iron ore consisting of a mixture of hydrated iron oxide-hydroxides in varying composition Frequently written as FeOnH 2 O, although this is not entirely accurate as the ratio of oxide to hydroxide .

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  • Iron in primeval seas rusted by bacteria - Physorg
    Iron in primeval seas rusted by bacteria - Physorg

    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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  • Microbial Bioremediation | Boundless Microbiology
    Microbial Bioremediation | Boundless Microbiology

    The critical reaction is the oxidation of sulfide by ferric iron The main role of the bacterial step is the regeneration of this reactant Copper leaching has a very similar mechanism Microorganisms Capable of Ore Leaching Bioleaching reactions industrially are performed by many bacterial species that can oxidize ferrous iron and sulfur

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  • Iron Oxidizing Bacterium - an overview | ScienceDirect Topics
    Iron Oxidizing Bacterium - an overview | ScienceDirect Topics

    CF Earhart, in Encyclopedia of Microbiology (Third Edition), 2009 Iron in Primary Fueling Reactions Some bacteria can use the oxidation of iron compounds as their primary energy source Bacteria capable of using inorganic, rather than organic, molecules for their fueling reactions are termed chemolithotrophs, and iron-oxidizing bacteria are a major group in this nutritional category

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  • Metal-eating microbes in African lake could solve mystery ,
    Metal-eating microbes in African lake could solve mystery ,

    Sep 09, 2015· The microbes metabolize iron and grow at rates high enough to indicate their ancient equivalents were capable of depositing some of the world’s largest sedimentary iron ore deposits, known as banded iron formations By oxidizing iron, these microorganisms likely helped shape the chemistry of the Earth over billions of years, ultimately .

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  • 166A: Microbial Ore Leaching - Biology LibreTexts
    166A: Microbial Ore Leaching - Biology LibreTexts

    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 ,

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  • THE LITTLE WORKERS OF THE MINING INDUSTRY | SCQ
    THE LITTLE WORKERS OF THE MINING INDUSTRY | SCQ

    Once this bacteria begins to grow it uses the Fe 2+ released in the second reaction as an electron source, thus regenerating Fe 3+, the ion capable of oxidizing even more of the mineral sulphid This process will continue until the pH of the water in the pile approaches 1 [1]

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  • Biobeneficiation of Iron Ores - sapub
    Biobeneficiation of Iron Ores - sapub

    Jan 02, 2012· Abstract 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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  • Iron in primeval seas rusted by bacteria -- ScienceDaily
    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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  • Acidithiobacillus - Wikipedia
    Acidithiobacillus - Wikipedia

    Iron-oxidizing bacteria - Wikipedia

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  • (PDF) Thermophilic iron-oxidizing bacteria found in copper ,
    (PDF) Thermophilic iron-oxidizing bacteria found in copper ,

    Rod-shaped bacteria capable of oxidizing ferrous iron at 55 degrees C were cultured from samples of a copper mine leach dump Yeast extract or cysteine was required by these Thiobacillus-like .

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  • A Study of Iron-Oxidizing Bacteria
    A Study of Iron-Oxidizing Bacteria

    Iron-oxidizing bacteria are chemotrophic bacteria that derive the energy they need to live and multiply by oxidizing dissolved ferrous iron They are known to grow and proliferate in waters containing iron concentrations as low as 01 mg/L However, at any rate 03 ppm of disintegrated oxygen is needed to carry out oxidation

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  • Innovations in Copper: Mining & Extraction: Producing ,
    Innovations in Copper: Mining & Extraction: Producing ,

    8 These bacteria were given the name ferrooxidans for their ability to oxidize iron sulfid A second set of bacteria was also identified and given the name thiooxidans for their ability to oxidize sulfur to yield sulfuric ac The bacteria, which were native to the soil, in effect created a completely natural metallurgical processing plant

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  • Mineral and iron oxidation at low temperatures by pure and ,
    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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