reducibility of magnetite

  • Fluidization behavior and reducibility of iron ore fines during hydrogen-induced fluidized …

     · A laboratory fluidized bed reactor was used to investigate the fluidization behavior and reducibility of various iron ore fines. Hydrogen was chosen as a reducing agent across a temperature range of 873–1073 K. The magnetite ore used exhibited strong sticking ...

  • Lime Magnetite Pellets

    reducibility of pellets. The requirement to pre-oxidize the magnetite before introduction to an ironmaking plant increases the CO 2 emissions generated during the ironmaking process. In this paper, a novel, alternative agglomeration route for magnetite 3 O

  • ALTERNATIVE BINDERS TO BENTONITE FOR IRON ORE …

    Reducibility of magnetite pellets sintered at 1300oC and reduced at 900oC for 3 hour Table 1. Swelling indices of pellets sintered at 1300oC and reduced at 900oC for 3 hours 3.3 Microstructures of pellets SEM micro-images of pellets thermally treated at 800o ...

  • Improvement of sinter strength and reducibility through promotion of magnetite …

    magnetite oxidation to hematite is important for high reduc-ibility. In addition to the above-mentioned effects, oxidation promotion means increase of heat generation, which can cause high sinter strength. Therefore, promoting oxidation of magnetite ore can

  • AND IN OREICOAL COMPOSITES

    For environmental and economical considerations, it is desirable to use iron ore concentrates directly without agglomeration and coal directly without coking for ironmcking.The present work is a study of the kinetics and mechanisms of iron ore reduction in ore/coal composites. ...

  • Improving reducibility of iron ore pellets by optimization of …

    Thus, with increase in amount of calcium hydroxide, hematite phase decreases due to dissociation of higher oxides to lower oxides. The reducibility increased with increasing amount of calcium hydroxide until 0.5 and then decreased due to increase of divalent oxides which are more difficult to reduce.

  • Reduction of Iron Oxides with Hydrogen—A Review

    If the reduction temperature is lower than 570 °C, reduction to Fe occurs stepwise from Fe 2 O 3 to Fe 3 O 4, called magnetite, and continues to Fe. The intermediate oxide, wüstite Fe (1−x) O, is not stable at temperatures lower than 570 °C.

  • Effect of Magnetite on Mineral Phase Formation in Sintering Process

    Tension strength and reducibility of the major phases in sinter ore.1,2) Tension strength (MPa) Reducibility (%) Hematite 49 50 Magnetite 58 27 Calcium ferrite 102 44

  • Improving reducibility of iron ore pellets by optimization of physical parameters

    reducibility of iron ore pellets of a specific chemistry can be improved by the optimization of physical parameters such as ... magnesio-ferrite, secondary hematite and magnetite etc.[ 1,2 ]. Furthermore, phase formation in pellets mainly depends upon the gangue ...

  • Improvement of sinter strength and reducibility through …

    Through magnetite concentration deteriorates reducibility because of high FeO content in sinter product. Such situation makes it to promote oxidation of magnetite iron ore during sintering process for improving sinter reducibility. In addition, promoting oxidation of ...

  • Reaction Kinetics of Iron Oxides in Ok Tedi Magnetite Skarn Ore

    3)/magnetite (Fe 3O 4)], particle size, porosity of pellets, temperature, and reduction time etc [1]. Similarly, in carbothermic reduction, the physical and chemical qualities of carbon are important influencing factors. It is therefore very essential to

  • Interactions Between Iron Oxides and 2010 the Additives Quartzite, Calcite and Olivine in Magnetite …

    2.2.1 Reducibility 9 2.2.2 Mechanical strength 10 2.2.3 High melting point and narrow softening-melting interval 10 2.2.4 Low swelling 10 2.3 Agglomeration of fine ore for blast furnace use 11 2.3.1 History 11 2.3.2 Pelletising of magnetite ore 12 2.4 2.4.1

  • IRON ORE SINTERING PART 2. QUALITY INDICES AND PRODUCTIVITY SINTERIZACIÓN …

    reducibility, and sinter quality in general, improves with a higher level of hematite than magnetite, and its structure improves with a higher level of primary or residual hematite and ferrites than secondary or precipitated hematite. 2.1.1. FeO sinter The FeO content

  • Features of the Reducibility of Titanomagnetite Iron Ore …

    The reducibility of titanomagnetite iron ore materials (agglomerate, pellets) with various TiO2 contents are studied. The mineralogical features of agglomerate and pellets before and after reduction are investigated. Calculations of technical and economic indicators of ...

  • Understanding the effects of goethitic iron ore – …

    Compared with hematite and magnetite, goethite has a much more diverse range of textural forms and occurrences, and its influence on iron ore processing is less understood. Currently, most analysis of the effects of goethite on mine performance considers only the …

  • REDUCIBILITY TEST OF IRON ORE LUMPS

    It was concluded from the results that the maximum size for magnetite was 25-30mm except those which had very low reducibility, about 40mm for dense hematite and about 50mm for porous hematite. With hematite and limonite of high porgsity or those which suffered cracks during heating, the size of org became no more a dominating factor upon reducibility.

  • Reducibility of iron ore pellets and effect of additions: …

     · Lime additions (with or without silica) lower the reducibility of sintered hematite and magnetite ore pellets. When silica alone is added, the reducibility of the pellet is not much affected. In the reduction of pellets made from a high-grade iron ore with no lime addition, there is initially rapid internal reduction of hematite to wustite; subsequently, the porous iron layer begins to form.

  • Improvement of sinter strength and reducibility through …

     · Through magnetite concentration deteriorates reducibility because of high FeO content in sinter product. Such situation makes it to promote oxidation of magnetite iron ore during sintering process for improving sinter reducibility.

  • Reduction Behavior of Dolomite-Fluxed Magnetite: …

     · Although the reducibility of magnetite concentrates is lower than hematite, the overall content of Fe (≤ 67 pct) is higher and can increase the productivity of the BF (blast furnace) operation. To increase the Fe content in the ore and lower the gangue content, beneficiation using iron ore fines and subsequent pelletizing is typical.

  • Metal Substitution-Induced Reducing Capacity of …

    Aqueous Fe­(II) (Fe­(II)aq) effectively magnifies the reducibility of magnetite toward environmental substances. In natural magnetite, isomorphous substitution by foreign metals is ubiquitous, and Zn2+ and Co2+ have been reported to positively improve the reducing capacity of magnetite coupled with Fe­(II)aq. Though most metal ions significantly alter the surface properties of magnetite ...

  • Iron Ore 2019

    Iron Ore 2019 was held in Perth, WA on 22-24 July 2019. It was the eighth in a series of international iron ore conferences jointly hosted by AusIMM and CSIRO. It covered the latest technological developments in a wide range of aspects of the iron ore industry, with ...

  • Sinter Quality and Process of Sintering Iron Ores – IspatGuru

     · Sinter is normally the major component of the blast furnace (BF) charge burden. Sinter consists of many mineral phases produced during process of sintering of iron ores. The quality and properties of sinter are dependent on the mineral structure of sinter. However, since the sintering conditions are usually not uniform throughout the sinter bed ...

  • Estimation of Reducibility of Sinter with Continuous …

     · In general, the reduction degree increase as time goes on, which the increase of magnetite phase contents in the sinter ore. When the hematite phase turned into magnetite phase by means of gas reduction, the volume of particles expands by gas penetration via pore, which causes the crack inside of the particle [ 14 ].

  • Reducibility and reduction swelling behaviour of some iron ore …

    Reducibility test: Total of 26 pellets Total weight: 120 g Size: 12.5–16 mm Well-fired pellets with nil to small-sized magnetite nucleus "No additives" test (CO-CO 2-N 2 gas)Reduction swelling test: 2 pellets of a certain grade, total of 4 pellet grades Weight: 4.7±0

  • Reduction of Iron Oxides with Hydrogen—A Review

    Oxidized magnetite shows nearly the same reducibility as natural hematite. Edström 41 investigated the reducibility of different iron oxides with hydrogen and carbon monoxide at 1000 C, as shown in Figure 7. The reduction of hematite occurs faster in both The ...

  • Improvement of Sinter Strength and Reducibility through Promotion of Magnetite …

    Through magnetite concentration deteriorates reducibility because of high FeO content in sinter product. Such situation makes it to promote oxidation of magnetite iron ore during sintering process for improving sinter reducibility. In addition, promoting oxidation of

  • CiNii

    It was found that reducibility of magnetite pellet was enhanced more than increase of mixing ratio by addition of hematite to magnetite ore, and rate retardation during H_2-reduction of magnetite pellet was also improved by the same treatment.

  • CHARACTERIZATION AND REDUCIBILITY OF ITAKPE AND …

    Clay Minerals (1984) 19, 843-856 CHARACTERIZATION AND REDUCIBILITY OF ITAKPE AND AGBAJA (NIGERIAN) IRON ORES F. A. ADEDEJI AND F. R. SALE* Delta Steel Complex, Warri, Nigeria, and *Department of Metallurgy and

  • Iron Ore Sinter – IspatGuru

     · Reducibility – The reducibility and reducibility index (RI) depends on the ease with which the reduction gases can penetrate the sinter. Reducibility of the sinter therefore depends on the porosity and surface structure, the intrinsic reducibility of the minerals and their assemblages, and the additional surface area generated during reduction as a result of the inherent volumetric changes ...

  • Improvement of sinter strength and reducibility through …

    Through magnetite concentration deteriorates reducibility because of high FeO content in sinter product. Such situation makes it to promote oxidation of magnetite iron ore during sintering process for improving sinter reducibility. In addition, promoting oxidation of

  • Metal Substitution-Induced Reducing Capacity of …

     · Aqueous Fe(II) (Fe(II)aq) effectively magnifies the reducibility of magnetite toward environmental substances. In natural magnetite, isomorphous substitution by foreign metals is ubiquitous, and Zn2+ and Co2+ have been reported to positively improve the reducing capacity of magnetite coupled with Fe(II)aq. Though most metal ions significantly alter the surface properties of magnetite…

  • Metal Substitution-Induced Reducing Capacity of Magnetite …

    Aqueous Fe(II) (Fe(II) aq) effectively magnifies the reducibility of magnetite toward environmental substances natural magnetite, isomorphous substitution by foreign metals is ubiquitous, and Zn 2+ and Co 2+ have been reported to positively improve the reducing capacity of magnetite …

  • Optimization of Reduction Parameters of Quenched …

    To improve the reducibility of titaniferous magnetite ore (TMO), a technique of high-temperature heating followed by water quenching has been adapted. This quenching technique imparts cracks into the dense TMO which in turn leads to the enhancement of reducibility during carbothermal reduction using boiler grade coal. A major problem associated with TMO is that the reducibility of the ore is ...

  • MAGNETITE ORE OF NAGALAND – ITS MINERALOGY AND …

    Keywords: Magnetite ore, Mineralogy, Reducibility, Reduction kinetics. INTRODUCTION The magnetite body near Pokphur in the Kiphere district of Nagaland assumes particular significance because of its rare type of occurrence associated with ophiolite. It ...

  • De-reducibility mechanism of titanium on maghemite …

     · Maghemite, as a non-stoichiometric iron oxide, was used in catalytic oxidation for its excellent reducibility and oxygen storage-release ability. It can be considered as an Fe(II)-deficient magnetite with formula (Fe III 8 ) A [Fe III 40/3 8/3 ] B O 32 where represents a cations vacancy, A and B indicates tetrahedral and octahedral positioning respectively.

  • Reducibility

    Reducibility of metal oxide decreases in general with an increase in the strength of M–O bond or heat of formation of metal oxide. By the same reason, the partially reduced metal oxide is more easily reoxidized as the strength of M–O bond or heat of formation of metal oxide increases. This is schematically illustrated in Fig. 2.7.

  • Metal Substitution-Induced Reducing Capacity of …

    Ying Li, Ying Li, Ying Li, Gaoling Wei, Gaoling Wei, Xiaoliang Liang, Xiaoliang Liang, Xiaoliang Liang, Caihua Zhang, Jianxi Zhu, Jianxi Zhu, Jianxi Zhu, Yuji Arai

  • IRON ORE SINTERING PART 2. QUALITY INDICES AND …

    It is important to have a high iron content, low gangue content, and basicity of the order of 1.6-2.1. Sinter reducibility, and sinter quality in general, improves with a higher level of hematite than magnetite, and its structure improves with a higher level of primary or residual hematite and ferrites than secondary or precipitated hematite. 2 ...

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