Effect of Added Olivine on Iron Ore Agglomerate During Induration

Ahmed, Hesham M.; Semberg, Pär; Andersson, Charlotte; Björkman, Bo

doi:10.2355/isijinternational.isijint-2017-327

Cited by 13 publications

(4 citation statements)

References 21 publications

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“…The appearance of MF phase means that a part of Fe 2+ is actually un-oxidized, which may result in the oxidation of Fe3O4 into Fe2O3 is impeded in a way. In addition, the MF phase has the same reverse spinel structure as the magnetite [10]. Consequently, the crystal transition from Fe3O4 to Fe2O3 existing in acid pellet is inhibited by MF phase.…”

Section: Analysis and Discussionmentioning

confidence: 99%

“…In a previous paper [9], it is pointed out that MgO adversely affects pellet strength due to the solid solution between the MgO and FeO. Ahmed et al [10] claimed that MgO in olivine can start to significantly react with Fe 3 O 4 after 1000 • C, and at 1250 • C fine olivine particles react completely whereas the reaction is limited for larger olivine particles. Also, the practice results in Baotou Iron and Steel Corporation China (Baotou, Inner Mongolia province, China) has shown that [11] when MgO content in pellet increases from 0% to 2.0%, the compressive strength decreases by about 500 N/pellet.…”

Section: Introductionmentioning

confidence: 99%

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Induration Process of MgO Flux Pellet

et al. 2018

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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 pellet strength. The current study focuses on the induration mechanisms of MgO flux pellet in terms of the oxidation process of Fe3O4 and densification process of the pellet. It is found that MgO dosage negatively affects the oxidation of Fe3O4 into Fe2O3. The number of recrystallized grain of Fe2O3 in the MgO flux pellet is less than that in the Non-MgO flux pellet. Additionally, an unreacted core model was applied to consider and clarify the oxidation of Fe3O4. According to the verification experiments, the experimental data and calculated results fit well. Therefore, the unreacted core model can describe the oxidation of Fe3O4 in the pellet induration process. Moreover, based on the development of pore parameters during the pellet induration process, a new index, the so-called oxide densification index (ODI) was defined to profoundly specify the densification degree of the pellet. The results show that the ODI of the MgO flux pellet maintains at a lower level compared with that of the Non-MgO flux pellet. It illustrates that MgO can substantially restrain the pellet densification process.

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Section: Analysis and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Induration Process of MgO Flux Pellet

et al. 2018

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“…[23][24][25] The compressive strength of oxidized pellets affects shaft furnace operation, as well as the efficiency of large-scale blast furnace production. [26][27][28][29] However, HVTM pellets (HVTMP) have a lower compressive strength than ordinary iron ores due to their complex compositions. The preparation of high-quality HVTMP is the foundation of this novel and clean smelting process.…”

Section: Influence Of B 2 O 3 On the Oxidation And Induration Processmentioning

confidence: 99%

Influence of B<sub>2</sub>O<sub>3</sub> on the Oxidation and Induration Process of Hongge Vanadium Titanomagnetite Pellets

Zeng

Wang

et al. 2021

ISIJ Int.

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“…A series of works had also been done by to investigate the addition of magnesium olivine on the reduction behaviour of magnetite pellets and interaction between iron ore and olivine under different temperatures. Also, the latest research by Ahmed et al [21] investigated the effect of olivine fineness on the induration process of magnetite pellets, which reported that only when oxidation temperature is above 1000, could the olivine significantly take part in the reaction with iron ore. However, the volume of research related relationship between magnesium olivine and compressive strength as well as the mineral structure of magnetite pellets is limited.…”

Section: Introductionmentioning

confidence: 99%

Effects of magnesium olivine on the mineral structure and compressive strength of pellets

Wang

Zhang

Liu

et al. 2018

Ironmaking & Steelmaking

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To study the effect of magnesium olivine on the compressive strength, phase composition and mineral structure of magnetite pellets, six groups of pellets were prepared by changing the content of olivine and the pellets were further subjected to the preheating and roasting processes in tube furnaces. Scanning electron microscopy-Energy dispersive spectrometer (SEM-EDS), X-Ray diffraction (XRD) and Mercury injection apparatus were used to characterise the microstructure and porosity of pellets. Results showed that four types of phases exist in pellets, which are hematite, (Mg,Fe)O-Fe 2 O 3 , silicate and incompletely mineralised magnesium olivine. With the addition of olivine, hematite phase content in pellets decreases while other phases tend a varying degree of increase. Mg in pellets mainly exists in the form of (Mg,Fe)O-Fe 2 O 3 and small part in the phase of silicate and incompletely mineralised magnesium olivine. Compressive strength of pellets decreases with the increase in magnesium olivine content. That is mainly because of the increasing porosity and impeded recrystallisation of hematite. The existence of incompletely mineralised magnesium olivine would both increase the porosity and hinder the connect of hematite particles; thus it is not conductive to the strength of pellets.

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Effect of Added Olivine on Iron Ore Agglomerate During Induration

Cited by 13 publications

References 21 publications

Induration Process of MgO Flux Pellet

Induration Process of MgO Flux Pellet

Influence of B<sub>2</sub>O<sub>3</sub> on the Oxidation and Induration Process of Hongge Vanadium Titanomagnetite Pellets

Effects of magnesium olivine on the mineral structure and compressive strength of pellets

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