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During the induration process of magnetite iron ore pellets, the magnetite phase converts to hematite, as shown in Eq. (1) [12], [13]. FeO.Fe 2 O 3 + O 2 = 6 Fe 2 O 3 ΔH = -490 kJ/mol(1) ... Due to the oxidation of magnetite to hematite, the FeO content reduces with increasing temperature. The faster oxidation of the outer shell of pellets is ...
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Based on the obtained results by the investigation of the features of magnetite–hematite ores from the Mikhailovskoye deposit, a technological scheme of magneto-flotation beneficiation was...
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The preparation of magnetite (Fe 3 O 4) has become of long-standing interest because of the diversified applications of magnetite in the industry as a pigment, in magnetic tapes, or as raw material for iron-making [1,2,3].Therefore, it is of great interest to study innovative synthetic methods to reduce the production costs of magnetite and …
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Iron Oxidation State: The oxidation state of iron in goethite is primarily +3. This oxidation state contributes to its reddish-brown to yellow-brown color. The presence of iron in the +3 oxidation state also makes goethite an important component of iron ore deposits.; Structure and Crystallography: Goethite crystallizes in the orthorhombic …
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The schematic diagram of use for the low grade hematite ore and the surplus coke oven gas to produce SNGs and high grade magnetite. XRD pattern of the raw hematite ore. Optical microscope images ...
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The FeO content of indurated HPGR and BM pellets reduced with increasing temperature due to the oxidation of magnetite to hematite. Also, the FeO content of …
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For example, iron forms a wide range of oxides, such as: magnetite, hematite, wüstite, goethite and maghemite, depending on the environmental conditions. In this work, we limited the mechanical study to three of the most common oxides: hematite (α-Fe 2 O 3), magnetite (Fe 3 O 4) and goethite (α-FeO·OH) which can be found under …
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How The Two Can Be Confused. Hematite is an iron oxide with the chemical formula Fe2O3; magnetite is also an iron oxide but with the chemical formula Fe3O4. Another important difference between hematite and magnetite is that hematite appears in a variety of colors, but magnetite is only black in color. Hematite makes a rust or blood-red …
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2. Characteristics of wustite. The actual chemical formula of the wustite is Fe x O or Fe 1−y O, where y represents the relative number of the ferrous iron ion vacancies; x is equal to 1 − y. It is cubic crystal with sodium chloride ().In other words, there is no compound FeO with a theoretical oxygen content of 22.27 wt% and an atomic ratio of Fe …
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FeO content in the synthesized magnetite concentrate was initially 31.06% which decreased to 0.28% at an induration temperature of 850 °C. The radical decrease of FeO content is due to the oxidation of the synthesized magnetite. ... Conversion of magnetite to hematite in iron-ore pellets. Steel Transl., 37 (4) (2007), pp. 336-338. …
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Iron is mainly present in the trivalent form—Fe 2 O 3 content ranges from 50.69 to 51.88%; bivalent iron is present in small …
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The chemical composition of magnetite concentrate and bentonite are presented in Table 1. It can be found that 82 wt% of the iron ore concentrate is composed of magnetite and 11 wt% of hematite, while SiO 2, MgO, CaO, and Al 2 O 3 are present as the main gangues in iron ore concentrate. Total Fe agrees well with reported values in …
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Selective reduction of saprolitic laterite ore types have been carried out with nickel and iron content in the ore, respectively 1.71 % and 18.93 %. ... [FeO (OH)] and hematite (Fe2O3 ...
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Thermodynamic calculation. For studying the phase composition variation during the reduction of different iron ore (hematite and magnetite) in pure H 2 with temperature, the thermodynamic calculation of the relevant reduction reaction was performed using a thermodynamic software FactSage [Thermfact/CRCT (Montreal) and …
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The followings are the results when magnetite and hematite are used together to. produce iron ore pellets: • As the hematite content in the mix pellets increases, the drop number of green ...
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Hematite is the world's most important ore of iron. Although magnetite contains a higher percentage of iron and is easier to process, hematite is the leading ore because it is more abundant and present in deposits in many parts of the world. Hematite is mined in some of the largest mines in the world.
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Starting with hematite, it's made up of iron and oxygen, with a specific formula of Fe 2 O 3. That means that for every two iron atoms, there are three oxygen atoms hanging around with them. Now, magnetite's formula is a bit more complex. Its formula is Fe 2+ (Fe 3+) 2 O 4.
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Hematite, magnetite, and other iron ore minerals differ in several key aspects, including their chemical composition, crystal structure, physical properties, and occurrences. Here are some of the main differences: 1. Chemical composition: Hematite is an iron oxide mineral with the chemical formula … See more
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Siderite ore can have a theoretical iron content of a maximum 48.2%. Goethite Ore: The Hidden Gem. Goethite is an iron ore variety containing iron content ranging from 41% to 62%. Often overshadowed by hematite and magnetite, goethite has its unique charm. Its dark brown to yellow-brown color and earthy appearance set it apart.
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In the similar work, the iron content in magnetite-hematite ore of Mikhailovskoye as reported by Nikolaeva was also found in the range of 38.3–40.1% for which they regarded as "low-Fe grade". In the work of Jonathan et al. the concentrated materials showed 40.4% of iron where hematite ore was concentrated by flotation …
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The magnetic rate is the percentage of ferrous oxide (FeO) content and total iron (TFe) content in the ore (( frac{textrm{FeO}}{textrm{TFe}} ) ×). The magnetic rate of pure magnetite is 42.8%. The low magnetic rate of iron ore indicates its high degree of oxidation and weak magnetism. In industry, iron ore with magnetic rate …
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Silica distribution index improved by 1.72 times for hematite ore, 1.47 times for magnetite ore, and 1.68 times for goethite ore. It has been found that bubble cavity …
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Abstract Iron ore, pellets, and sinter were reduced with hydrogen at 800 °C to understand the degree of reduction and the mineralogical aspects. The weight loss of goethite and limonite iron ore was noticed to be lower than that of magnetite and hematite varieties. X-ray diffractometry (XRD) indicated 100 pct Fe in the case of hematite, 93 pct …
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The complexity of the reduction of hematite to magnetite and magnetite to iron was illustrated by the dependence of E on the extent of conversion, α(0.02≤α≤0.95).
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(a) Magnetite is the most important industrial iron ore in terms of the quantity used. (b) Magnetite has the inferior magnetic qualities which is not valuable in the electric industry.(c) It is the finest iron ore with a very high content of iron up to 70% (d) It has a slightly lower iron content than hematite (50-60%).
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Hardness and elastic properties of pure (crystal) and complex (product of corrosion) iron oxides, magnetite (Fe 3 O 4 ), hematite (α-Fe 2 O 3) and goethite (α …
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This paper mainly highlights the formation of magnetite ore (Fe 3 O 4) by reduction of hematite iron ore (Fe 2 O ). Here, Fe and Fe 3 O 4 are magnetic, while FeO and Fe 2 O 3 are non-magnetic in nature. 2. MATERIALS AND METHODOLOGY EMPLOYED IN THE STUDY 2.1. Materials. A sample of low-grade hematite iron ore …
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Hematite has unpaired electrons that cause its magnetic properties. It is paramagnetic because it has only ferric ion (Fe 3+).The electron configuration of Fe 3+ is 1s 2 2s 2 2p 6 3s 2 3p 6 3d 5 where 5 unpaired electrons are present. Therefore, hematite can be separated from a mixture using high-intensity magnetic separation methods which …
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Iron Content: Hematite is a rich source of iron, typically containing about 70% iron by weight. This high iron content makes it an important ore for iron extraction and steel production. Crystal Structure: …
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ABSTRACT: Present investigation includes the magnetizing roasting of low-grade iron ore fines followed by grinding and beneficiation using magnetic separation. …
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