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Hematite and magnetite are the two main minerals in China's numerous iron or e sources. As easily processed mineral resources become depleted, iron …
A study was conducted to investigate the use of flotation in combination with dense-medium cycloning utilizing ultrafine ( {minus}10 {micro}m) magnetite, as an integrated process for high-efficiency cleaning of fine coal.
Depending on culture conditions and bacterial forms (Vali et al., 2004), the respiration of iron-reducing bacteria based on solid Fe(III) mineral phases produces extracellular magnetite crystals (Lovley et al., 1987; Lovley, 1991; Coker et al., 2008) of ultrafine grains with diameters between 10 and 50 nm.
N2 - 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 ...
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).
Magnetite cored PAMAM G3 dendrimer was synthesized and amide groups were reduced using LAH to afford amine group enriched polyamine dendrimer; subsequently surface was grafted with succinic ...
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 …
Ferromagnetic properties of ultrafine magnetite (Fe 3 O 4 ) particles were examined by the ESR and the static magnetic susceptibility measurements. Ferromagnetic resonance became to be observed at the particle size larger than 3.4 nm. This finding suggests that the bulk-like ferromagnetic state cannot be formed in the particle less than 3.4 nm diameter for magnetite.
The production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent magnetism of sediments2-4.
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 basicity (CaO/SiO2 mass …
The magnetic properties of Fe‐Si‐B‐M (M: additives) alloys prepared by annealing amorphous alloys made by the single roller method over their crystallization temperature have been investigated for development of new Fe‐based soft magnetic alloys. Excellent soft magnetic properties were obtained by adding the two elements Cu and Nb to Fe‐Si‐B alloys.
In this work, preheating and roasting tests of pellets made from blends of Western Australia ultra-fine (WAU) magnetite concentrate and Chinese domestic magnetite concentrate or Brazilian hematite concentrate were carried out. The results showed that pellets made from 100 per cent WAU magnetite concentrate possesses inferior preheating and roasting performance when …
Magnetite (Fe 3 O 4) is a mineral of great commercial value in that it is useful, e.g., in magnetic recording devices and as toner for plain paper copiers. Particularly desirable for these purposes is magnetite in ultrafine-grained (roughly 20-50 nanometers in diameter) form.
@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) …
TEM image of Fe 3 O 4 (Fig. 2e) obviously shows ultrafine nanoparticles with a particle size of 6 ± 2 nm. The interplanar spacing of the lattice (Fig. 2f) is measured to be 0.485 nm, matching well with the (111) plane of magnetite Fe 3 O 4 (JCPDS no. 89–0688) .
Two grades of magnetite were used for this series of tests. Type-I was an ultrafine magnetite with a top size of 15 µm, which was supplied by the Pea Ridge Iron Ore Company. Type-II was coarser (43% < 15µm) and was …
Simple magnetic separation for a certain magnetite mine with ultrafine disseminated lean ores has resulted in low performance, as the fine sizes and aggregation of ground mineral particles have caused inefficient recovery of the ultrafine minerals. In this study, we attempt to increase the apparent sizes of target mineral particles, and improve the separation indices, by using a …
Ferritin-based ultrafine-grained magnetites can be taken as ideal sample for superparamagnetism study, because of (1) controllable and uniform grain size, (2) mono-dispersed, (3) lack of magnetic interaction, (4) good availability and (5) "ideal" SP behaviors at room temperature.
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 spectroscopy and optical microscopy.
Ultrafine scheelite could flocculate with modified magnetite and then be recovered using magnetic separation. • EDLVO calculation illustrated electrostatic force and hydrophobic force caused the flocculation. Abstract Froth flotation has been proven to be the most efficient mineral processing technology for fine particles.
Ball milling was used to prepare two ultrafine magnetic biochar/Fe3O4 and activated carbon (AC)/Fe3O4 hybrid materials targeted for use in pharmaceutical removal by adsorption and mechanochemical degradation of pharmaceutical compounds. Both hybrid adsorbents prepared after 2h milling exhibited high …
The selective recovery of ultrafine, <10 μm, particles remains a significant challenge in the minerals industry. Indeed, these particles often report to tailings impoundments, resulting in under-utilization of mined resources and the need for tailings dams. Recently, a technique has been developed offering the potential to selectively recover particles down to <1 μm in size.
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 …
Modify. . Create. . Ferric oxide is an iron oxide. Iron (III) oxide or ferric oxide is the inorganic compound with the formula Fe2O3. It is one of the three main oxides of iron, the other two being iron (II) oxide (FeO) the rarer form, and iron (II,III) oxide (Fe3O4) which naturally as magnetite.
an ultrafine system containing mostly fine target particles "f-uf", with MAG (f) and QRZ (uf). The magnetite feed grade xMAG,f is systematically set to 10%. For each experiment, the suspension is treated by ultra-sonication in a water bath for 5 min and then poured into the flotation cell for conditioning.
Ultrafine magnetite particles of 4-10 nm were prepared in aqueous solutions of polyvinylalcohol (PVA) or PVA with partially exchanged carboxyl groups. The mode of agglomeration and dispersion of the particles were different depending on the properties of polymers in the solvent.
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 situ...
aggregated with gangue minerals, such as micro-zone 5.Ultrafine magnetite particles below 5 μ m in size are commonly sighted, e.g., in micro-zones 1, …
Bringing reliable magnetite performance to the world's largest material separation and mineral processing companies. ... Ultrafine Grade. 90-95% – Passing 45 micron 95-99% – Passing 53 micron. Superfine Grade. 87-89% – Passing 45 micron 92-95% – Passing 53 micron. Fine Grade.
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 apparently biogenic magnetite …