Four samples containing ultrafine- and fine-grained magnetite of magnetoferritins and magnetotactic bacteria cells were magnetically characterized at both room and low temperatures. Transmission electron microscopy analysis showed that the biometrically synthesized magnetoferritins (M-HFn) have magnetite cores with a mean …
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Haejae-1 isolated from inter-tidal flat sediments was able to produce copious amount of ultrafine magnetite via glucose fermentation extracellularly under anaerobic …
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The production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent magnetism of sediments2-4.
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This paper proposes a straightforward air-aqueous oxidation of St3 steel wastes for mass production of pure ultrafine magnetite. The characterization of the obtained product has been made by X-ray fluorescence analysis, X-ray diffraction, impedance spectroscopy, low-temperature nitrogen absorption method, Möss …
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The magnetite Fe3O4 nanoparticles have a broad range of applications due to the combination of specific magnetic and electrical properties. It is important to develop synthesis approaches where magnetite nanoparticles can be obtained from cheap …
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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 temperature ...
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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. We report here on ...
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Bacterial production of magnetite represents a significant contri bution to the natural remanent magnetism of deep-sea and other sediments 1-5• Because cells of the freshwater magnetotactic bac
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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 ...
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As the ultrafine iron ore concentrate was used to prepare green pellets, the main problem was the serious cracking during the drying process. The fine particles contacted so closely that the ...
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Mostly, magnetite iron ore mine materials contain significant amounts of sulfur base components. This can cause disturbance in production process of steel. Although high-sulfur magnetite concentrate has not been inciting enough yet to be employed by steel industry, these compounds are potential alternatives for iron ore …
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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 …
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The magnetic properties of certain soils indicate the widespread presence of ultrafine-grained magnetite, even where there is no detrital input of magnetite1–3. This suggests that in ...
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In this work, the oxidation and induration characteristics of pellet made from a Western Australian ultrafine magnetite concentrate were revealed by conducting routine preheating-roasting tests in ...
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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 …
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The reducing property of pellets prepared by ultrafine magnetite concentrate (UMC) and improving method were revealed. The results show that the reduction degree of UMC pellets is only about 56% ...
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Results indicated that ether diamine and monoamine could highly float ultrafine quartz particles (95.9 and 97.7%, respectively) and efficiently separate them from ultrafine magnetite particles.
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Effect of polymer concentration and molecular weight. A range of SiPEG coated magnetite particles, with varying molecular weight PEG groups (350, 550, 750, 1000 and 3400 Da), was prepared at 80°C. In preliminary studies, SiPEG 3400 and SiPEG 5000 particles were prepared at low polymer concentration ( Ceq =0.01 and 0.015 mol dm −3, …
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The Geldart A magnetite particles were mixed with the Geldart C ultrafine coal particles having a large particle density and size differential. The Geldart C ultrafine coal particles were added to modulate the fluidization behavior of the Geldart A magnetite particles, as outlined in the work of Zhang et al. (2021) [35]. These mixture particles ...
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˚ne and ultrane magnetite and hematite particles will end up in the tailing dams1–4. Flotation separation (direct or reverse) is the most common method for processing iron oxides in a typical ...
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Semantic Scholar extracted view of "Oxidation and Induration Characteristics of Pellets Made from Western Australian Ultrafine Magnetite Concentrates and Its Utilization Strategy" by Cong-cong Yang et al. ... (BF-OSM) route is still a dominant process for worldwide steel production, currently producing more than 60% of the world's total …
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The production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent …
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Ultrafine Magnetite Nanopowder: Synthesis, Characterization, and Preliminary Use as Filler of Polymethylmethacrylate Nanocomposites ... 2 Departments of Materials and Production Engineering ...
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Rapid, high-yield aqueous synthesis of ultrafine magnetite nanoparticles from Fe(III) precursor at room temperature. ... The production of CO via Reverse Water Gas Shift (RWGS) reaction is a ...
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Ultrafine Magnetite Production Basalt Myanmar · Ultrafine Magnetite Production Basalt Myanmar We are a largescale jointstock enterprise integrating r d production sales and service after 40 years of innovation and development we now have three major production sites sandstone grinding and beneficiation and become an enterprise with both soft and …
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Magnetite is the most common and utilized form of naturally occurring iron oxides, with the chemical formula Fe 3 O 4 [32].It is characterized by a crystalline cubic inverse spinel structure, in which ferrous ions occupy half of the octahedral lattice sites and ferric ions occupy the other half of the octahedral lattice sites and all the tetrahedral …
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Ultrafine-grained magnetite can ... reported extracellular production of magnetite by an anaerobic iron-reducing organism, designated GS-15. The magnetite grains I I I SIAM I10-4 Am 0 kg-• l
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Accordingly, HCl-based agitation leaching followed by co-precipitation was carried out, resulting in ultrafine mesoporous nano-magnetite (2.47–4.27 nm particle …
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A considerable amount of ultrafine magnetite as the iron source will end up in the tailing dams since the magnetic separation process markedly drops as the particle …
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Results indicated that ether diamine and monoamine could highly float ultrafine quartz particles (95.9 and 97.7%, respectively) and efficiently separate them from ultrafine magnetite particles.
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