Microbial production of ultrafine-grained magnetite by fermentation processes at room temperature. roh y1, kim y, lee s, jang h, suh y. author information 1faculty of earth systems and environmental sciences, chonnam national university, gwangju 500-757, korea.
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A method of producing magnetite nanoparticles was developed through culturing a microorganism designated Haejae-1, Shewanella sp., in the presence of glucose and akaganeite (beta-FeOOH). Haejae-1 isolated from inter-tidal flat sediments was able to produce copious amount of ultrafine magnetite via glucose fermentation extracellularly under anaerobic conditions at room
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The results of these studies have shown that the nonmagnetotactic GS-15 bacterium can produce large quantities of ultrafine-grained magnetite extracellularly by coupling oxidation or organic matter with reduction of ferric iron compounds under anaerobic conditions. By the method of the present invention, therefore, a new and inexpensive source of ultrafine-grained
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Unlike prior art production of magnetite using magnetotactic bacteria, GS-15 is able to produce large amounts of ultrafine-grained magnetite extracellularly under
MoreMicrobial production of ultrafine-grained magnetite by fermentation processes at room temperature. roh y1, kim y, lee s, jang h, suh y. author information 1faculty of earth systems and environmental sciences, chonnam national university, gwangju 500-757, korea.
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Unlike prior art production of magnetite using magnetotactic bacteria, GS-15 is able to produce large amounts of ultrafine-grained magnetite extracellularly under anaerobic conditions, allowing for easy separation and recovery of the magnetite without the need for rigorous control over oxygen tensions in the culture medium. As a result, the method of the present invention can be
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A method of producing magnetite is disclosed which comprises culturing a microorganism designated GS-15 in the presence of organic matter and a ferric iron compound. Unlike prior art production of magnetite using magnetotactic bacteria, GS-15 is able to produce large amounts of ultrafine-grained magnetite extracellularly under anaerobic conditions, allowing for easy
More
The production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent magnetism of sediments2-4. However, recent studies on iron reduction in anaerobic sediments suggested that bacteria can also generate magnetite in the absence of oxygen5.
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ultrafine magnetite mill mining and construction machine. Ultrafine Powder Micronizer Mill Amp Flour Milling Machine .HG ultrafine grinder mill,ultrafine grinding mill is the new type mining equipment for making micro powders, fine powders, which is widely applied in the industries of metallurgy, mining, chemistry, cement, construction, refractory materials, ceramics, and so
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Black ultrafine magnetite particles of this invention have an FeO content of 31 to 35% and a particle size of 0.1 μm or less. A process for producing the black ultrafine magnetite particles comprises dispersing ultrafine magnetite particles with a particle size of 0.1 μm or less in water containing ferrous hydroxide, aging the dispersion of 90 to 200° C. at a free alkali
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Magnetite (Fe 3 O 4 ) nanoparticles prepared by microwave-assisted hydrothermal synthesis have been characterized in terms of morphological and structural features. Electron micrographs collected in both scanning (SEM) and transmission (TEM) modes and evaluations of X-ray powder diffraction (XRD) patterns have indicated the achievement of a monodispersed crystallite
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01.09.1994 Ultrafine magnetite particles were prepared through a hydrothermal process at 130°–150°C from a solution of iron chloride and iron powder in the presence of urea. XRD and chemical analysis indicated that the product was magnetite. The size and morphology of the particles were studied by TEM. The magnetite particles had a coercive force of 175 Oe and a
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mpl ultrafine powder tech, a manufacturer of ore crushers and mills, has focused on the field of ultrafine powder grinding for many years. Independently researched and developed ultra-fine grinding mills, ultra-fine vertical roller mills, etc., which can grind ore powder of 200-3000 mesh. The machine has stable performance, high efficiency and
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A facile and green route is presented for mass production of oriented magnetite porous fibers (with >96% in yield), based on the protein assisted hydrothermal method in citric aqueous solution. The magnetite fibers are nearly cylindrical in shape, several ten micrometres in length and 120 nm in mean diameter. The whole single fibers are packed by the ultrafine Fe 3 O 4
MoreMicrobial production of ultrafine-grained magnetite by fermentation processes at room temperature. roh y1, kim y, lee s, jang h, suh y. author information 1faculty of earth systems and environmental sciences, chonnam national university, gwangju 500-757, korea.
MoreUnlike prior art production of magnetite using magnetotactic bacteria, GS-15 is able to produce large amounts of ultrafine-grained magnetite extracellularly under anaerobic conditions, allowing for easy separation and recovery of the magnetite without the need for rigorous control over oxygen tensions in the culture medium. As a result, the method of the present invention can be
MoreA method of producing magnetite is disclosed which comprises culturing a microorganism designated GS-15 in the presence of organic matter and a ferric iron compound. Unlike prior art production of magnetite using magnetotactic bacteria, GS-15 is able to produce large amounts of ultrafine-grained magnetite extracellularly under anaerobic conditions, allowing for easy
MoreThe production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent magnetism of sediments2-4. However, recent studies on iron reduction in anaerobic sediments suggested that bacteria can also generate magnetite in the absence of oxygen5.
Moreultrafine magnetite mill mining and construction machine. Ultrafine Powder Micronizer Mill Amp Flour Milling Machine .HG ultrafine grinder mill,ultrafine grinding mill is the new type mining equipment for making micro powders, fine powders, which is widely applied in the industries of metallurgy, mining, chemistry, cement, construction, refractory materials, ceramics, and so
MoreBlack ultrafine magnetite particles of this invention have an FeO content of 31 to 35% and a particle size of 0.1 μm or less. A process for producing the black ultrafine magnetite particles comprises dispersing ultrafine magnetite particles with a particle size of 0.1 μm or less in water containing ferrous hydroxide, aging the dispersion of 90 to 200° C. at a free alkali
MoreMagnetite (Fe 3 O 4 ) nanoparticles prepared by microwave-assisted hydrothermal synthesis have been characterized in terms of morphological and structural features. Electron micrographs collected in both scanning (SEM) and transmission (TEM) modes and evaluations of X-ray powder diffraction (XRD) patterns have indicated the achievement of a monodispersed crystallite
More
Magnetite: South Australia’s potential. 2021-12-17 Magnetite ore beneficiation circuits are optimised to a grind size that achieves optimal concentrate specifications (i.e. minimal impurities) for the least amount of power input (i.e. cost).
More01.09.1994 Ultrafine magnetite particles were prepared through a hydrothermal process at 130°–150°C from a solution of iron chloride and iron powder in the presence of urea. XRD and chemical analysis indicated that the product was magnetite. The size and morphology of the particles were studied by TEM. The magnetite particles had a coercive force of 175 Oe and a
MoreA facile and green route is presented for mass production of oriented magnetite porous fibers (with >96% in yield), based on the protein assisted hydrothermal method in citric aqueous solution. The magnetite fibers are nearly cylindrical in shape, several ten micrometres in length and 120 nm in mean diameter. The whole single fibers are packed by the ultrafine Fe 3 O 4
More