ultrafine magnetite production

ultrafine magnetite production

Microbial production of ultrafine-grained magnetite by ...

Microbial production of ultrafine-grained magnetite by fermentation processes at room temperature A method of producing magnetite nanoparticles was developed through culturing a microorganism designated Haejae-1, Shewanella sp., in

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US4886752A - Microbial production of ultrafine-grained ...

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

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Microbial production of ultrafine-grained magnetite - The ...

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.

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Pure ultrafine magnetite from carbon steel wastes ...

Jan 01, 2019 · 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, Mössbauer spectroscopy and optical microscopy.

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Protein assisted hydrothermal synthesis of ultrafine ...

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

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Constraining the magnetic properties of ultrafine- and ...

Dec 24, 2018 · 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 size of 5.3 ± 1.2 nm

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One-Pot Synthesis and Large-Scale Production Strategies ...

In this study, we demonstrate a facile strategy for the large-scale preparation of ultrafine magnetic Sm2Fe17N3 particles. During the preparation of magnetic nanoparticles (which includes reduction at a high temperature), a blocking agent (e.g., CaO), which enwraps the intermediate phase and discretizes it from the magnetic phase, is often introduced to control the particle size.

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Improvement on the thermal cracking performance of pellets ...

Jan 15, 2019 · Pellet prepared from western Australia ultrafine magnetite have compact structure. ... Hence, how to improve the cracking temperature of green pellets is the key to the stable and efficient production. In this paper, the ultra-fine material of SINO magnetite concentrate (abbreviated form of UMC) coming from west Australia was used to prepare ...

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Microbial production of ultrafine-grained magnetite by ...

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 g

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Cost-effective production of large quantities of ultrafine ...

Jul 21, 2017 · JP-2020528106-A chemical patent summary.

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Reaction Mechanisms of the Electrosynthesis of Magnetite ...

5 小时前 · Ultrafine magnetite particles are prepd. through an electrochem. process, at room temp., from an iron-based electrode immersed in an alk. aq. medium contg. complexing compds. XRD and chem. anal. indicate that the product is pure magnetite, Fe3O4. The size and morphol. of the particles are studied by SEM.

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Protein assisted hydrothermal synthesis of ultrafine ...

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

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Constraining the magnetic properties of ultrafine- and ...

Dec 24, 2018 · 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 size of 5.3 ± 1.2 nm

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The use of flotation to separate fine coal and ultrafine ...

Oct 01, 1995 · @article{osti_110014, title = {The use of flotation to separate fine coal and ultrafine magnetite from dense-medium cyclone products}, author = {Polat, M and Klima, M S and Chander, S and Ahuja, G}, abstractNote = {A study was conducted to investigate the use of flotation in combination with dense-medium cycloning utilizing ultrafine ({minus}10 {micro}m)

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JPS61242902A - Production of ultrafine particle of high ...

JPS61242902A JP8213185A JP8213185A JPS61242902A JP S61242902 A JPS61242902 A JP S61242902A JP 8213185 A JP8213185 A JP 8213185A JP 8213185 A JP8213185 A JP 8213185A JP S61242902 A JPS61242902 A JP S61242902A Authority JP Japan Prior art keywords production oxygen melting ultrafine metallic oxide Prior art date 1985-04-19 Legal

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Why we need Magnetite’s high-grade iron ore - and heaps of ...

Dec 13, 2021 · Magnetite projects stand to benefit from the shifting sands There are two main types of minerals in iron ore deposits sold in the commercial seaborne iron ore market. The first is hematite, which has high in-situ grades of high 50s to mid 60s in iron content, and is the cheapest to develop and operate at large scale, making it the mainstay of ...

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Natural Magnetite: an efficient catalyst for the ...

May 11, 2015 · The • OH production also increased with H 2 O 2 concentration ... Maher, B. A. & Taylor, R. M. Formation of Ultrafine-Grained Magnetite in Soils. Nature 336, 368–370 (1988).

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Ultrafine ferroferric oxide nanoparticles embedded into ...

Dec 03, 2015 · An effective one-pot hydrothermal method for in situ filling of multi-wall carbon nanotubes (CNT, diameter of 20–40 nm, length of 30–100

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Magnetite Formation During Microbial Dissimilatory Iron ...

During the initial studies with these Fe(III)-reducing organisms it was discovered that ultrafine-grained magnetite is an endproduct of dissimilatory Fe(III) reduction. Keywords Sedimentary Environment Ferric Iron Band Iron Formation Magnetotactic Bacterium Anaerobic Sediment

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The oxidation kinetic study of mechanically milled ...

Jun 04, 2018 · Ultrafine iron powders are used in different areas as catalysts, magnetic fluids, magnetic alloys etc [1,2,3].One of the methods for ultrafine powders production, including iron powders, is an electrical explosion of wires (EEW) [4,5,6,7,8].The iron powders obtained by EEW differ from iron micropowders by their characteristics, primarily the lower temperature of

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XZM Ultrafine Grinding Mill - Shanghai Zenith Company

Ultrafine powder, wide applications, excellent environmental effect. ZENITH’s XZM Ultrafine Grinding Mill is widely used for superfine powder production. The output size can reach 2500mesh (5um). It is suitable to grind soft or medium-hard materials whose moisture is below 6%. Materials should be non-explosive and non-flammable such as ...

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XZM Ultrafine Mill - m.zenithcrusher

XZM Ultrafine Mill. ZENITH's XZM Series Ultrafine Mill is widely used for micron powder production. It is suitable to grind the material with middle and low hardness, moisture below 6%, and the material should be non-explosive and non-flammable.

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(PDF) Formation of Ultra Fine-Grained Magnetite in Soils

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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Ultrafine Magnetite Nanopowder: Synthesis ...

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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Cost-effective production of large quantities of ultrafine ...

Jul 21, 2017 · JP-2020528106-A chemical patent summary.

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Formation of ultrafine-grained magnetite in soils | Nature

Nov 24, 1988 · 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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Reaction Mechanisms of the Electrosynthesis of Magnetite ...

5 小时前 · Ultrafine magnetite particles are prepd. through an electrochem. process, at room temp., from an iron-based electrode immersed in an alk. aq. medium contg. complexing compds. XRD and chem. anal. indicate that the product is pure magnetite, Fe3O4. The size and morphol. of the particles are studied by SEM.

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(PDF) Protein assisted hydrothermal synthesis of ultrafine ...

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

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Anaerobic production of magnetite by a dissimilatory iron ...

The production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent magnetism of sediments 2-4. However, recent studies on iron reduction in anaerobic sediments suggested that bacteria can also generate magnetite in the absence of oxygen 5.

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Magnetite: South Australia’s potential

Production of magnetite ore commenced in South Australia in 2007 and has averaged around 2 Mtpa since then. Production has been derived predominantly from the Iron Magnet mine (South Middleback Range), a massive magnetite-bearing metasomatite deposit underlying the Iron Duke and Iron Duchess hematite deposits.

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Magnetite (Fe3O4): Properties, Synthesis, and Applications

33 Magnetite: Properties, Synthesis, & Application Lee Blaney SYNOPSIS The subsequent report presents scientific data concerning properties of micro- (diameter in 10-6 m meter range) and nano- (diameter in 10-9 m meter range) magnetite, an iron oxide with chemical structure Fe3O4, particles; additionally, the properties of nano-particulate magnetite are

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Ultrafine CoO nanoparticles as an efficient cocatalyst for ...

In order to further enhance the performance of photocatalysts, cocatalysts are used to accelerate the photocatalytic reactions. Herein, ultrafine cobalt oxide (CoO) nanoparticles are synthesized through a novel bottom-up strategy and explored as an efficient non-noble cocatalyst to dramatically promote the photocatalytic hydrogen evolution rate of CdS nanorods.

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Continuous production of nanosized magnetite through low ...

Continuous production of nanosized magnetite through low grade burial Myriam Kars Laboratoire de Géologie, Ecole Normale Supérieure, UMR8538 CNRS, 24 Rue Lhomond, FR-75231 Paris CEDEX 05, France ([email protected]) Laboratoire des Fluides Complexes et leurs Réservoirs, Université de Pau et des Pays de l’Adour,

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Dextran coated ultrafine superparamagnetic iron oxide ...

Dextran coated ultrafine superparamagnetic iron oxide nanoparticles: compatibility with common fluorometric and colorimetric dyes. by Sioned M Griffiths, Neenu Singh, Gareth J S Jenkins, Paul M Williams, Alvin W Orbaek, Andrew R Barron, Chris J Wright, Shareen H Doak. Analytical chemistry. Read more related scholarly scientific articles and abstracts.

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Dextran Coated Ultrafine Superparamagnetic Iron Oxide ...

May 15, 2011 · The distinct difference in the oxidative potential of maghemite and magnetite may be related to the oxidative state of the iron ions in the complex. In maghemite (Fe 2 O 3) iron ions are mostly Fe 3+, while in magnetite (Fe 3 O 4) they are a mixture of Fe 3+ and Fe 2+ with a Fe 2+ /Fe 3+ ratio of 0.435 (Table (Table1). 1).

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