Abstract. 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.
˜e extraordinary growth in steel demand has emerged in iron mines for further production. Magnetite and hematite (iron oxides) are the primary iron resources mainly upgraded by magnetic ...
Within the last 15–20 years, an increasing number of environmental scientists have become interested in investigating the magnetic properties of a range of earth surface materials, from atmospheric dusts, soils, and all kinds of sediments — deep-sea,...
The results show that pellet made from ultrafine magnetite concentrate possesses better oxidability and preheating performance than that made from Chinese magnetite concentrate. ... and less emission of environmentally harmful dust and gases during the production process [1–3].
Results indicated that ether diamine and monoamine could highly float ultrafine quartz particles (95.9 and 97.7%, respectively) and efficiently separate them …
Here we report the recovery and identification of pure, ultrafine-grained magnetite from some UK soils that have no apparent external source of magnetite.
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 ... a clean pellet production method of calcium roasting and sulfuric acid leaching of vanadium from vanadium and titanium magnetite concentrates is ...
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 …
Formation of ultrafine-grained magnetite in soils ... reported extracellular production of magnetite by an anaerobic iron-reducing organism, designated GS-15. The magnetite grains
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.
Ultrafine magnetite particles of 4–10 nm were prepared in aqueous solutions of polyvinylalcohol (PVA) or PVA with partially exchanged carboxyl groups.…
Magnetite has been used for magnetic resonance and uorescence imaging for medical diagnosis [1], AC magnetic eld-assisted cancer therapy [2], drug delivery [3], chemi-cal [4] and biochemical sensors [5], adsorbents for environmental remediation [6 ], visible light water spliing for hydrogen production [7 ], ferrouids [8 ],
Most ultra-fine magnetite grains were adjacent and wrapped with limonite to form complex intergrowths, which resulted in low-efficiency magnetite recovery in low …
Magnetic particles formed by dissimilatory iron-reducing bacteria are typically ultrafine, as such generating mineral carriers with superparamagnetic properties, (e.g. ultrafine magnetite or greigite) from …
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 …
To investigate the feasibility of co-sintering of fluxed iron ore with magnetite concentrates, the mineralogical properties of a novel fluxed iron ore were studied using particle size analysis, microscopic morphology characterization, and X-ray diffraction Rietveld analysis. Following that, the experiments for granulation performance and basic …
This review offers a general presentation of magnetite, covering topics such as the morphologies, properties, and applications of this material. Further on, the …
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% ...
The reaction for production of magnetite is relatively slower than other neutralization reactions, and therefore a very low concentration of magnetite is expected to be present at the start of the reaction. ... (2018) A model for the particle mass yield in the aerosol synthesis of ultrafine monometallic nanoparticles by spark ablation. Journal ...
Bacterial production of magnetite represents a significant contribution to the natural remanent magnetism of deep-sea and other sediments1–5. Because cells of the freshwater magnetotactic bacterium Aquaspirillum magnetotacticum require molecular oxygen for growth and magnetite synthesis6, production of magnetite by magnetotactic bacteria …
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% compared with that of pellets prepared from ordinary iron ore concentrate with relatively coarse particle size, which is significantly lower than the …
The production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent magnetism of sediments2-4.
Maghemite found in association with coarser aeolian magnetite provides evidence for ultrafine maghemite production from magnetite oxidation, although the proportional contribution of this pathway to total soil magnetic enhancement is unclear (Chen et al., 2005).
Bacterial production of magnetite represents a significant contribution to the natural remanent magnetism of deep-sea and other sediments1–5. Because cells of the freshwater magnetotactic ...
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 …
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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In this study, homogeneous ultrafine magnetite particles were prepared by a hydrothermal procedure starting from a solution of iron chloride and iron powder, using …
Utilizing ultrafine iron ore concentrate for pellet production can expand domestic iron ore resources in China and promote the utilization of low-grade ores. However, a challenge arises with the low decrepitation temperature and reducibility in the preparation process of ultrafine iron ore concentrate pellets. To address the challenge, …
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 ...
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, promoting …
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