In recent years, reduction roasting followed by magnetic separation has been suggested as an alternative method that is conducted to obtain an iron
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2017-7-10 Moreover, the reduction of hematite to wüstite, magnetite, and iron has been widely investigated for chemical looping combustion (Monazam et al., 2013, Monazam et al., 2014, Huang et al., 2013) and for the direct reduction process in the iron industry (Mondal et al., 2004 and Yang et al., 2007).
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Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (2): 261-266. DOI: 10.12068/j.issn.1005-3026.2019.02.021 • Resources Civil Engineering • Previous Articles Next Articles Reductive Transformation of Hematite to Magnetite with CO/CO 2 Under Fluidized Bed Conditions . YU Jian-wen， HAN Yue-xin， GAO Peng， LI Yan-jun
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2019-8-1 The transformation of weakly magnetic hematite to magnetite is a promising technique that can enhance the efficiency of magnetic separation of hematite quartzite. The transformation of hematite into magnetite involves the partial reduction of Fe(III) to Fe(II) and converting the rhombohedral crystal system of hematite into cubic of magnetite.
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2019-10-4 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 characteristics of the
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2019-7-30 4 JournalofChemistry 0 10 20 30 40 50 60 70 80 90 b b b b b b b b a a a a a Intensity b: hematite a: quartz a a a b 2theta (∘)Figure2:XRDpatternoftherawhematiteore.
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2019-7-1 The conversion of hematite to magnetite is not the limiting factor as a reduction of ferric iron to ferrous iron is a fast process and the magnetizing roasting of oxidized iron ores has been reported at low temperature 350–400 °C using CO, H 2, and syngas (Faris et al., 2017, Fruehan, 1977). Unlike conventional ores, BHJ ore consists of dual ...
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2022-1-7 In this research work, it was attempted to reduce the iron contents (Fe2O3) in silica from Shenin silica mine. This silica sand contains 93.75% SiO2, 0.44% Fe2O3, 2.78% Al2O3, and 0.08% TiO2 and ...
MoreJournal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (2): 261-266. DOI: 10.12068/j.issn.1005-3026.2019.02.021 • Resources Civil Engineering • Previous Articles Next Articles Reductive Transformation of Hematite to Magnetite with CO/CO 2 Under Fluidized Bed Conditions . YU Jian-wen， HAN Yue-xin， GAO Peng， LI Yan-jun
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2009-10-2 The production of magnetic nanoparticles of Fe3O4 or Fe0 coated with carbon and carbon nanotubes was investigated by the reduction of hematite with ethanol in a Temperature Programmed Reaction up to 950°C. XRD and Mössbauer measurements showed after reaction at 350°C the partial reduction of hematite to magnetite. At 600°C the hematite is completely
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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 characteristics of the magnetite
More
2018-9-4 process for conversion of hematite to magnetite using a gas mixture of hydrogen. and argon is enabled to produce a product containing at least 96.32 % of. magnetite. BENEFITS OF THE INVENTION. A process to utilize large quantities of hematite generated during pickling. of steel. The magnetic produced after reduction of hematite find economic and
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Coal-based direct reduction followed by magnetic separation technique was employed to produce direct reduction iron powder (DRI powder) from a high-phosphorus oolitic hematite ore, and the effects of type and particle size of coal and C/O (Fixed carbon/Oxygen) mole ratio on this process were investigated. The
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The microwave magnetic roasting process of low-grade hematite under low temperature was studied experimentally. The effects of roasting temperature, carbon content and roasting time on the reduction and magnetic separation were investigated. It shows that the best percent reduction is 10.96％(near to theoretical value 11.11%)which can be obtained under the condition of
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Direct reduction iron was prepared by adding dephosphorization agents during a direct reduction roasting-magnetic separation process,and the effects of reductants on the direct reduction process of high-phosphorus oolitic hematite were studied.Experimental results and SEM analysis show that the aggregation and growth of iron crystals,the increase of iron crystals' amount and
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The reduction of hematite occurs faster in both cases, with hydrogen and carbon monoxide. The reduction of magnetite with carbon monoxide shows a very low reduction rate. The main reason is the formation of different structures and porosities, which strongly depends on the raw material used, during the reduction process.
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2014-8-7 Thermogravimetric analysis (TGA) of magnetite (Fe3O4) oxidation was conducted at temperatures ranging from 750 to 900 °C over 10 oxidation cycles. Oxidation experiments were carried out in a continuous stream of air for period of 30 min. The oxidized magnetite (Fe3O4), which resulted in formation of hematite (Fe2O3), was then reduced by using continuous
More2009-10-2 The production of magnetic nanoparticles of Fe3O4 or Fe0 coated with carbon and carbon nanotubes was investigated by the reduction of hematite with ethanol in a Temperature Programmed Reaction up to 950°C. XRD and Mössbauer measurements showed after reaction at 350°C the partial reduction of hematite to magnetite. At 600°C the hematite is completely
More2018-9-4 process for conversion of hematite to magnetite using a gas mixture of hydrogen. and argon is enabled to produce a product containing at least 96.32 % of. magnetite. BENEFITS OF THE INVENTION. A process to utilize large quantities of hematite generated during pickling. of steel. The magnetic produced after reduction of hematite find economic and
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US2870003A US666059A US66605957A US2870003A US 2870003 A US2870003 A US 2870003A US 666059 A US666059 A US 666059A US 66605957 A US66605957 A US 66605957A US 2870003 A US2870003 A US 2870003A Authority US United States Prior art keywords hematite flame magnetite dust ore Prior art date 1957-06-17 Legal status (The legal
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2014-5-13 The more stable phases in iron oxides are hematite and magnetite. Hematite can be used in a lot of applications, such as sensors [], water photooxidation [], drug delivery [], lithium ion battery [], pigmentation [], solar cell [], etc., and magnetite can be utilized in biomedicine [7–11], magnetic devices [], etc.Therefore, studies about the nano/microstructures of iron
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Abstract: In order to investigate the effects of sodium carbonate on magnetic concentration and dephosphorization in direct reduction roasting process of a high phosphorous oolitic hematite from Nigeria， the products of direct reduction roasting were analyzed by Xray diffraction(XRD) and scanning electron microscopy(SEM) after sodium carbonate was added.
More2014-8-7 Thermogravimetric analysis (TGA) of magnetite (Fe3O4) oxidation was conducted at temperatures ranging from 750 to 900 °C over 10 oxidation cycles. Oxidation experiments were carried out in a continuous stream of air for period of 30 min. The oxidized magnetite (Fe3O4), which resulted in formation of hematite (Fe2O3), was then reduced by using continuous
MoreDirect reduction iron was prepared by adding dephosphorization agents during a direct reduction roasting-magnetic separation process,and the effects of reductants on the direct reduction process of high-phosphorus oolitic hematite were studied.Experimental results and SEM analysis show that the aggregation and growth of iron crystals,the increase of iron crystals' amount and
MoreThe reduction of hematite occurs faster in both cases, with hydrogen and carbon monoxide. The reduction of magnetite with carbon monoxide shows a very low reduction rate. The main reason is the formation of different structures and porosities, which strongly depends on the raw material used, during the reduction process.
More2006-1-18 Relationship between hematite content and frequency-dependent magnetic susceptibility (χ FD) in soil profiles developed on loess of the Russian steppe [Maher et al., 2002] in areas with mean annual precipitation (MAP) of 300 mm (open triangles), 340 mm (open circles), 380 mm (open squares), 450 mm (solid triangles) and 480 mm (solid squares) and on
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