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Hydrothermal preparation and characterization of ultrafine

1994.9.1  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.

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Inorganic Formation of Ultrafine-Grained Magnetite SpringerLink

First, magnetic measurements of natural materials are highly sensitive; they can detect the presence of ferrimagnetic minerals, such as magnetite, at concentrations as low as ten

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Formation of ultrafine-grained magnetite in soils Nature

1988.11.24  Here we report the recovery and identification of pure, ultrafine-grained magnetite from some UK soils that have no apparent external source of magnetite. We

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Simultaneous Removal of Multiple Heavy Metal Ions

2019.4.30  Here, four heavy metal ions, namely, Pb 2+, Cd 2+, Cu 2+, and Ni 2+, have been successfully removed simultaneously from river water using ultrafine mesoporous magnetite (Fe 3 O 4) nanoparticles

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Rapid, high-yield aqueous synthesis of ultrafine magnetite ...

2023.12.28  Rapid, high-yield aqueous synthesis of ultrafine magnetite nanoparticles from Fe (III) precursor at room temperature. The magnetite Fe 3 O 4 nanoparticles have

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Particle size and wettability effect of ultrafine magnetite ... - USTB

The results suggest that ultrafine particle size and wettability strongly affect ballability. Its better wettability on account of particle ultrafine size characteristic is beneficial to...

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Ultrafine Magnetite Nanopowder: Synthesis,

2012.1.1  Magnetite (Fe3O4) nanoparticles prepared by microwave-assisted hydrothermal synthesis have been characterized in terms of morphological and structural features.

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Rapid, High-Yield Aqueous Synthesis of Ultrafine Magnetite ...

Rapid, High-Yield Aqueous Synthesis of Ultrafine Magnetite Nanoparticles from Fe (III) Precursor at Room Temperature. The magnetite Fe3O4 nanoparticles have a broad

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Some basic properties of granules from ore blends consisting of ...

2019.7.27  Some basic properties of granules, including the granule size distribution, packed-bed permeability, and chemical composition of the adhering layer, were investigated in this study for four iron ore blends consisting of 5wt%, 25wt%, and 45wt% ultrafine magnetite and 25wt% ultrafine hematite concentrates. The effects of varying the sinter

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Some basic properties of granules from ore blends consisting of ...

2018.9.14  Some basic properties of granules, including the granule size distribution, packed-bed permeability, and chemical composition of the adhering layer, were investigated in this study for four iron ore blends consisting of 5wt%, 25wt%, and 45wt% ultrafine magnetite and 25wt% ultrafine hematite concentrates. The effects of varying the sinter

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Formation of ultrafine-grained magnetite in soils - NASA/ADS

The magnetic properties of certain soils indicate the widespread presence of ultrafine-grained magnetite, even where there is no detrital input of magnetite 1-3 . This suggests that in situformation of magnetite can occur under soil-forming conditions. Schwertmann and Taylor 4 have stated, however, that magnetite has not been found as a newly

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Constraining the magnetic properties of ultrafine- and fine

2018.12.24  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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Particle size and wettability effect of ultrafine magnetite ... - USTB

Two kinds of magnetite concentrates from Pilbara in Australia and an area in the northeast in China were used to explore the effect of wettability, which depends on particle size, on ballability. Capillary osmosis equipment of a horizontal plate was constructed based on the equation Washburn. To investigate the effect of particle size and wettability of ultrafine

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Simultaneous Removal of Multiple Heavy Metal Ions from River

2019.4.24  Here, four heavy metal ions, namely, Pb 2+, Cd 2+, Cu 2+, and Ni 2+, have been successfully removed simultaneously from river water using ultrafine mesoporous magnetite (Fe 3 O 4) nanoparticles (UFMNPs) based on the affinity of these metal ions toward the UFMNP surfaces as well as their unique mesoporous structure,

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Reverse Column Flotation of Ultrafine Magnetite Mixture with

2022.5.5  Reverse Column Flotation of Ultrafine Magnetite Mixture with Fine Glass Beads Enhanced by Fine Bubbles N. N. Rulyov 1,2, L. O. Filippov 3,*, D. Y. Sadovskyi 1,2, V. V. Lukianova 2,4 and I. V. Filippova 3 1 Institute of Biocolloid Chemistry, National Academy of Sciences of Ukraine, 03142 Kyiv, Ukraine;

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Biodegradable ether amines for reverse cationic flotation

2023.11.23  However, the upgrading of ultrafine magnetite flotation was rarely addressed. Chipakwe et al. examined the effect of a polyacrylic acid-based grinding additive (GA) through flotation separation of magnetite from quartz (size fraction of − 106 + 38 µm) using an ether amine-based collector and indicated that using GA can reduce collector

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Biodegradable ether amines for reverse cationic flotation ... - Nature

2023.11.23  However, the upgrading of ultrafine magnetite flotation was rarely addressed. Chipakwe et al. examined the effect of a polyacrylic acid-based grinding additive (GA) through flotation separation of ...

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Magnetic properties of ultrafine magnetite particles and their

1996.4.20  The pH of the magnetite suspension after the end of precipitation was 1.5, 4.0 or 0.6 respectively. The suspension of the ultrafine magnetite particles was prepared by adding the washed particles to a 3 wt.% PYA aqueous solution and then ball-milling with one hundred 16 mm glass balls for 48 h. The ball-milled sample was denoted Mag-OH

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Biodegradable ether amines for reverse cationic flotation ... - Nature

magnetite particles (potentially hydrophobic coagulation) and enhance their depression. Surface analyses revealed that the collector mainly adsorbed on the quartz particles, while it was essentially a

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[PDF] Ultrafine-grained magnetite in deep-sea sediments:

A new extraction technique now permits ultrafine magnetite crystals to be separated from a variety of deep-sea sediments. Morphologic characterization of these particles with transmission electron microscopy reveals the presence of several distinct crystal types, some of which closely resemble those formed by the magnetotactic bacteria. The

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Home Tasmania Mines Pty Ltd

Tasmania Mines Pty Ltd is a privately owned company. The primary source of our magnetite products is from the Kara Mine site, located 35km south from the Port of Burnie in North West Tasmania, Australia. Our products are sold directly from Tasmania Mines Pty Ltd to export customers and through Kara Magnetite Pty Ltd for customers in Australia.

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Preparation of ultrafine silica- and PEG-coated magnetite particles

2001.4.1  Particle size and electrophoresis data for a range of SiPEG-coated magnetite particles (varying molecular weight PEG groups: 350, 550, 750, 1000 and 3400 Da, coating reactions performed at 80°C) are plotted together as a function of pH in Fig. 4 a–e.. Download : Download full-size image Download : Download full-size image

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Ultrafine-grained magnetite in deep-sea sediments: Possible

A new extraction technique now permits ultrafine magnetite crystals to be separated from a variety of deep-sea sediments. Morphologic characterization of these particles with transmission electron microscopy reveals the presence of several distinct crystal types, some of which closely resemble those formed by the magnetotactic bacteria.

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Rapid, High-Yield Aqueous Synthesis of Ultrafine Magnetite ...

Rapid, High-Yield Aqueous Synthesis of Ultrafine Magnetite Nanoparticles from Fe(III) Precursor at Room Temperature Journal of Materials Science 2024 Andris Šutka, Sanda Bitina, Krisjanis Smits, Anna Šutka, Liga Bikse, Mikhail Maiorov, Tanel Käämbre, Martin Timusk, Lauma Laipniece, Kristīne Lazdoviča. The magnetite Fe3O4 nanoparticles have

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of Ultrafine Disseminated Magnetite Ores - ResearchGate

adhesion with feldspar; ultrafine quartz in aggregated grains or veins are common; dissemination is highly non-uniform, the fineness size is below 0.15 mm; particularly, 50% of the grains are of ...

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Improving roasting performance and consolidation of pellets

2020.4.8  For improving the strength of pellets made of ultrafine and super-high-grade magnetite concentrates, the influence of basicity (CaO/SiO2 ratio) on the roasting and consolidation of pellets was investigated. The results showed that with the basicity of pellets increasing from 0.09 to 0.60, the compressive strength of both preheated and

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Some basic properties of granules from ore blends consisting of ...

Some basic properties of granules, including the granule size distribution, packed-bed permeability, and chemical composition of the adhering layer, were investigated in this study for four iron ore blends consisting of 5wt%, 25wt%, and 45wt% ultrafine magnetite and 25wt% ultrafine hematite concentrates.

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Recovery of ultrafine scheelite particles by magnetic seeding ...

2021.11.5  The EDLVO calculation quantified the interaction energy between the modified magnetite and ultrafine scheelite, and the results revealed that the interaction energy between the modified magnetite and ultrafine scheelite appeared as an attraction, building the foundation for the magnetic separation of ultrafine scheelite.

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Shear behavior of ultrafine magnetite tailings subjected to freeze

To study the shear behavior of the ultrafine magnetite tailings subjected to freeze-thaw cycles, unconsolidated-undrained shear tests were conducted on ultrafine-grained tailings that were subjected to 1-11 cycles of freeze-thaw and defined as a type of clayey silt under confining pressures of 100, 200, and 300 kPa. Taking the number of freeze-thaw cycles,

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Hydrothermal preparation and characterization of ultrafine magnetite ...

1994.9.1  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.

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(PDF) Simultaneous Removal of Multiple Heavy Metal Ions from

2019.4.30  Application of ultrafine magnetite nanoparticles in different types of water. Individual removal of Pb 2+ , Cu 2+ , Cd 2+ , and Ni 2+ ions from contaminated (a) deionized water and (b) river water.

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Effect of Ultrafine Powder of Hematite and Magnetite on

Effect of ultrafine powder of Hematite and Magnetite on granulation characteristics of iron oxide was investigated by mixing and exterior coating granulation. The results obtained are follows: (1) In the case of Hematite Ore H, particle diameter of granule is increase with increasing the amount of fine powder in both mixing granulation and exterior coating

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Quantifying ultrafine pedogenic magnetic particles in Chinese

2010.10.13  Considering both the mathematical difficulty for quantifying the distribution of coercivities and uncertainty concerning the fraction of ultrafine pedogenic magnetite or maghemite in Chinese loess, we presume two different mean coercivities of H c = 25 mT and 30 mT, respectively, with saturation magnetization of J s = 478 kA/m for magnetite

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Formation of Ultra Fine-Grained Magnetite in Soils - ResearchGate

1988.11.24  Many studies show that ultrafine-grained magnetite is formed inorganically during pedogenesis (Taylor et al., 1987; Maher and Taylor, 1988; Geiss and Zanner, 2006).

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Innovative pre-concentration technology for recovering ultrafine ...

2021.11.1  1. Introduction. Panzhihua, the largest vanadium–titanium magnetite resource base, provides more than 70% ilmenite for the titanium industry in China [1], [2].Owing to the complex element lattice substitution, the vanadium–titanium magnetite ore in Panzhihua is finely ground to recover the titanium magnetite [3].However, it is worth

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Mineralization characteristics of pellets prepared by ultrafine ...

Ultrafine magnetite concentrate Ordinary magnetite Fig. 1 Grain size distribution of UMC Fig. 2 Microstructure property of UMC Table 1 Main chemical compositions of raw materials (wt.%) Raw material TFe FeO SiO 2 CaO MgO Al 2O 3 K 2ONa 2OS P Ordinary magnetite concentrate 67.08 23.56 5.01 0.13 0.34 0.48 0.04 0.07 0.03 0.03

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Some basic properties of granules from ore blends consisting of ...

Some basic properties of granules from ore blends consisting of ultrafine magnetite and hematite ores Cong-cong Yang, De-qing Zhu, Jian Pan, and Yue Shi School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China (Received: 14 September 2018; revised: 9 November 2018; accepted: 13 November 2018)

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