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Blaney, Lee, "Magnetite (Fe3O4): Properties, Synthesis, and Applications" (2007). Volume 15 - 2007. Paper 5. This Article is brought to you for free and open access by the Lehigh Review at Lehigh Preserve. It has been accepted for inclusion in Volume 15 - 2007 by an authorized administrator of Lehigh Preserve.
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The synthesis of magnetite at basic pH, from ferrous salts, could follow two ways, one of them where Fe(OH) 2 is precipitated, then cubic Fe 3 O 4 and another one in which the synthesis of acicular α-FeOOH and α-Fe 2 O 3 precursors are included (Fig. 1).Many of the processes through which maghemite particles are prepared, need, as …
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Even 5% of CO was sufficient to convert hematite into magnetite, which resulted in an increase in magnetization up to 85 Am 2 /kg. The kinetic analysis indicated that the reduction of hematite to magnetite is a single-step process, which can be described using the first-order reaction model.
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The induration process of oxidized pellet, containing the oxidation of magnetite phase (Fe3O4) and the sintering of oxidized magnetite phase (hematite–Fe2O3), is significant to obtain sufficient ...
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Magnetite has the chemical formula Fe3O4, which means it is composed of two iron (Fe) ions combined with three oxygen (O) ions. Here is some information on the …
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Abstract. This chapter introduces the principle of how low-grade iron ores are upgraded to high-quality iron ore concentrates by magnetic separation. Magnetite is the most magnetic of all the naturally occurring minerals on earth, so low-intensity magnetic separators are used to upgrade magnetite ores. On the other hand, because oxidized …
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An option study for a 10 Mt/a ore processing plant for a. consistently hard, fine-grained silica-rich magnetite ore was. carried out, with the emphasis on comminution circuit options. capacity of ...
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Understanding the crystallization process of magnetite will improve the design and control of its prop... This review focuses on the magnetite crystallization …
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The addition of EDDS improved the heterogeneous photo-Fenton degradation of bisphenol A (BPA) through the formation of photochemically efficient Fe-EDDS complex. This effect is dependent on the H 2 O 2 and EDDS concentrations and pH value. The high performance observed at pH 6.2 could be explained by the ability of O 2·- to generate Fe (II ...
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Semantic Scholar extracted view of "Dissolution–reprecipitation process of magnetite from the Chengchao iron deposit: Insights into ore genesis and implication for in-situ chemical analysis of magnetite" by Hao Hu et al.
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The DRP of magnetite is a fluid-assisted process involving the dissolution of early magnetite and precipitation of secondary porous magnetite with sharp boundaries (Hu et al., 2014, Hu et al ...
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To understand the formation and growth mechanism of the magnetite phase during the fluidized reduction of hematite, a high-purity hematite ore was isothermally reduced using a 20vol% CO?80vol% CO 2 gas mixture in a micro-fluidized bed to examine the process of the selective conversion of hematite to magnetite. The micro-structural …
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The magnetite-added reactor (RM) was significantly more resistant and resilient to process imbalance than the reactor run without magnetite addition (RC). RC showed unstable performance with repeated process upsets, but its performance improved to be comparable to that of RM after applying magnetite supplementation.
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Similar to igneous magnetite, the most important factors that govern compositional variations in hydrothermal magnetite are (A) temperature, (B) fluid composition — element availability, (C) oxygen and sulfur fugacity, (D) silicate and sulfide activity, (E) host rock buffering, (F) re-equilibration processes, and (G) intrinsic ...
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All are magnetic, although franklinite and jacobsite are only weakly so; magnetite, which frequently has distinct north and south poles, has been known for this …
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In the process of beneficiating iron ores by the magnetic separation, particles of hematite and quartz accumulate, forming tailings that occupy large areas of …
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Key Takeaways. Hematite and magnetite are two types of iron ore with significant industrial applications. Hematite is formed by weathering processes in sedimentary rocks, while magnetite forms during igneous processes. Hematite is easier to process and can be extracted through open-pit or underground mining methods, while …
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Magnetite in the Devonian Yuleken porphyry Cu–Mo deposit located in NW China witnessed complicated magmatic-hydrothermal ore-forming processes. The magnetite grains can be divided into Mag I-A (from the Beitashan Formation basalt), Mag I-B (from the porphyritic syenite wall rock), Mag II (from sodic-calcic alteration zone), Mag …
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The natural magnetite is widely present in various rock minerals. [6, 7] Because isomorphous substitution occurs in the structure of such magnetite iron ores, a beneficiation process is required to decrease the gangue and …
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The solid-state electrochemical reduction process of magnetite in Li batteries: in situ magnetic measurements toward electrochemical magnets. J. Mater. Chem. C 2, 5183 (2014).
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Np-magnetite addition changed the microbial community of the granular sludge, analysed via high-throughput 16S RNA sequencing, and recovered the treatment efficiency previously disturbed by the disintegration processes. These results indicate the potential of Np-magnetite as an agent for sludge aggregation in an aerobic granular reactor.
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Procedure for magnetite synthesis. The synthesis process included two main stages. The first stage was the synthesis of carbon monoxide by activated charcoal gasification. For this, activated charcoal was heated to 750 °C. After that, air was fed into the gas generator and passed through the layer of activated charcoal.
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A probable reason of conversion of a part of hematite into magnetite is the presence of ions-reductants in RM, such as high molecular weight water-soluble polymers (flocculants), sulfide ions etc., which do not directly participate in reduction of Fe(III) to Fe(II), but have a positive effect on this process (Liu and Naidu, 2014; Lu and Tsai ...
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The coprecipitation method is the most widely used process for magnetite nanoparticles synthesis because of the high yield of nanoparticles that can be synthesized, its simplicity, low-cost and its eco-friendly reaction conditions [27,28,29], very important characteristics for industrial applications.
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Magnetite (Fe 3 O 4) can form via magmatic, hydrothermal, and metamorphic processes, making it a common mineral in a variety of rock types and deposits (Dupuis and Beaudoin, 2011; Nadoll et al., 2014).
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In order to study the slag composition of vanadium-titanium magnetite in the blast furnace smelting process and slag-iron slag, the slag composition was adjusted by adding different proportions of ...
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Magnetite formed complex aggregate structures with microbes, and magnetite recycling also helped retain more biomass in the process. Methanosaeta was likely the major methanogen group responsible for DIET-based methanogenesis, in association with Proteobacteria and Chloroflexi populations as syntrophic partners.
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Magnetite geochemistry can be significantly modified by reequilibration processes, especially the dissolution and reprecipitation process (Hu et al., 2014;Wen et al., 2017;Huang and Beaudoin, 2019 ...
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Oxidation of magnetite to ferric hydroxide is more prominent at higher pH resulting in formation of intermediate product and more energy consumption. [Citation 29] Therefore, the reaction mixture is mixed in …
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