Special attention is given to magnetite as it is the most versatile and naturally available iron oxide form. Its synthetic production can be performed in various methods, such as co-precipitation, solvothermal, ultrasonic irradiation, laser ablation, chemical reduction, and even plant-based processes.
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 ...
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 …
Results indicated that ether diamine and monoamine could highly float ultrafine quartz particles (95.9 and 97.7%, respectively) and efficiently separate them …
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].
ABSTRACT Particle size and shape of iron ore concentrate are effective parameters in the production of quality green pellets. In this research, the effect of particle morphology on ... Mineralization characteristics of pellets prepared by ultrafine magnetite concentrate: influence on metallurgical property and improving method. Xiao-hui Fan Zhi ...
The paper presents the results of experiments on the production of composite fibers based on polyacrylonitrile (PAN) and magnetite. For this, magnetite nanoparticles were synthesized by the method of chemical condensation from iron (III) chloride solutions with a concentration of 0.32 mol/l and iron sulfate with a concentration …
˜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 ...
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% ...
Mineralization characteristics of pellets prepared by ultrafine magnetite concentrate: influence on metallurgical property and improving method ... The increasing production capacity of pellets requires huge iron ore concentrate supply, and therefore, more and
The production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent magnetism of sediments2-4.
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 …
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.
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 …
In this investigation, the reduction characteristics of the pellets prepared from ultrafine iron ore concentrate were studied, and the mechanism of organic binder improving the …
Pellet prepared from western Australia ultrafine magnetite have compact structure. ... As a result, the pellet production will be affected due to the low cracking temperature caused by the deterioration of gas permeability [[7], [8], [9]].
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 ...
The particles used in this work were magnetite powders and ultrafine coal particles with their properties listed in Table 1. The size distribution of the magnetite powder and the ultrafine coal particles shown in Fig. 2 were measured by a Particle Size Distribution Analyzer (TSI Group Inc. Model 3603). According to the Geldart particle ...
Most ultra-fine magnetite grains were adjacent and wrapped with limonite to form complex intergrowths, which resulted in low-efficiency magnetite recovery in low …
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 …
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 ...
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 production of ultrafine-grained magnetite by magnetotactic bacteria in surficial aerobic sediments may contribute significantly to the natural remanent magnetism of sediments2-4.
Herein, we are presenting a single-step 1-minute room-temperature aqueous precipitation synthesis of ultrafine crystalline magnetite nanoparticles by using only a FeCl 3 salt as a precursor.
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.
The occurrence of ferrous and ferric iron minerals, including magnetite, martite, and goethite, has shed more light on the possible exploitation of the texturally complicated BIF as a precursor for the production of nano-magnetite through agitation leaching followed by co-precipitation method.
Formation of ultrafine-grained magnetite in soils ... reported extracellular production of magnetite by an anaerobic iron-reducing organism, designated GS-15. The magnetite grains
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 …
Download Citation | Rapid, high-yield aqueous synthesis of ultrafine magnetite nanoparticles from Fe(III) precursor at room temperature | The magnetite Fe3O4 nanoparticles have a broad range of ...
Here we report the recovery and identification of pure, ultrafine-grained magnetite from some UK soils that have no apparent external source of magnetite.