Investigation of the oxidation induration mechanism of Hongge vanadium titanomagnetite pellets with different Al2O3 additions

Li, Wei; Fu, Guiqin; Chu, Mansheng; Zhu, Miaoyong

doi:10.1016/j.powtec.2019.10.081

Cited by 17 publications

(6 citation statements)

References 30 publications

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“…As indicated in Formula (9), when the p is small, K 2 p 2 is also small and can be ignored. Thus, the relationship between critical rupture stress and porosity is defined by the following formula (8) [21]: Equation (10) shows that the critical rupture stress decreased with the increase in porosity, which declined the compressive strength. The larger porosity in the pellet can produce matrix instability, which decreases the critical rupture stress [18].…”

Section: Resultsmentioning

confidence: 99%

Section: Thermal Analysismentioning

confidence: 99%

“…The lower melting-point phase Ca 4 Si 2 F 2 O 7 was formed, which increased the amount of liquid phase and decreased the compression strength of pellets. Wei Li et al [21] discussed the effect of different Al 2 O 3 and SiO 2 on the oxidation induration mechanism of Hongge vanadium titanomagnetite pellets (HVTMP). The Al 2 O 3 have no significant effect on the phase composition of HVTMP.…”

Section: Introductionmentioning

confidence: 99%

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Investigate the oxidation induration mechanism of manganese-bearing magnetite concentrate pellets

Xiao

et al. 2022

Ironmaking & Steelmaking

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In this study, to promote the application of manganese-containing magnetite, the oxidation induration mechanism for manganese-bearing magnetite concentrate pellets (MBMCP) was investigated. X-ray diffraction, scanning electron microscopy-energy dispersive spectroscopy, and thermogravimetric analyses were carried out to systematically study the phase composition, microstructure, elemental distribution, and oxidation behaviour of the MBMCP. The results indicated that Mn 3 O 4 exerted had a negative effect on the oxidation induration of the pellet. With an increase in the amount of added Mn 3 O 4 , the compressive strength and oxidation degree significantly decreased and the porosity increased. The content of the formed Mn-Fe solid solution (MnFe 2 O 4 ) increased with the increase of Mn 3 O 4 , which made the matrix of the MBMCP change from dense to porous, suggesting that the growth of haematite grains was inhibited and the bridging between haematite grains was broken. These results provide the theoretical and technical foundations for the industrial production of MBMCP.

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Section: Resultsmentioning

confidence: 99%

Section: Thermal Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigate the oxidation induration mechanism of manganese-bearing magnetite concentrate pellets

Xiao

et al. 2022

Ironmaking & Steelmaking

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“…[14][15][16][17] In recent years, many researchers have studied the preparation of VTM pellets, especially the influence of composition. [18][19][20][21][22][23][24] Zeng et al [22] discussed the effect of CaO on the compressive strength of VTM pellets. The experimental results of Li et al [23] illustrated that the addition of Al 2 O 3 had a sharp influence on the oxidation degree and compressive strength of VTM pellet.…”

Section: Introductionmentioning

confidence: 99%

Effect of TiO₂ during Oxidation Roasting Process of Pellet: Kinetic Mechanism and Microstructure

Feng,

Tang,

Wang

et al. 2023

steel research int.

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This study investigates the effect of TiO2 on the oxidation kinetic mechanism of iron ore concentrate under nonisothermal conditions. Based on the fact that iron‐containing materials are mainly smelted in the form of pellets, the microstructure evolution of pellets with different TiO2 additions during oxidation is studied to verify the accuracy of the kinetic analysis results. The results show that the reaction model is the mechanism describing oxidation of iron ore concentrate under different TiO2 additions at stages I and II. The increase of TiO2 increases E and worsens the oxidation kinetic conditions at stages I and II. This phenomenon is caused by the Fe–Ti solid solution embedded in the hematite particles hindering the recrystallization and large‐scale crystal bridge connection of hematite. The fluctuation amplitude of apparent activation energy (E) at stages I and II is 23.6112 and 19.508 kJ mol−1, respectively. Furthermore, the mechanism of stage III corresponds to the diffusion model, and the increase of TiO2 decreases E and improves the oxidation kinetic conditions. It is due to the loose structure of pellets with the increase of TiO2, facilitating the internal diffusion of reaction gases. The fluctuation amplitude of E is 5.07 kJ mol−1 at stage III.

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“…The technologies used to process vanadiferous titanomagnetite are blast furnace -converter steelmaking, direct reduction -electric furnace melting and direct reduction -magnetic separation [6][7][8][9]. Moreover, several researches have shown that pre-oxidation can significantly improve the utilization efficiency of low-grade vanadiferous titanomagnetite ore when processing it [10][11][12]. Therefore, in order to improve the utilization efficiency of low-grade vanadiferous titanomagnetite concentrate with high titanium (LVCHT) as much as possible, this paper investigates its oxidation process and oxidation kinetics to provide reference for the treatment of similar minerals.…”

Section: Introductionmentioning

confidence: 99%

Oxidation kinetics of a low-grade vanadiferous titanomagnetite concentrate with high titanium

Liu

Cheng

Liu

et al. 2022

J. Phys.: Conf. Ser.

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In order to better develop and utilize the low-grade vanadiferous titanomagnetite concentrate with high titanium (LVCHT) and provide reference for the treatment of similar minerals. Oxidation process and kinetics of the LVCHT were investigated in this study. The results show that LVCHT presents weight loss at temperatures less than 600 °C, which is attributed to the removal of moisture and volatile components. Above 600 °C, the weight gain of LVCHT is due to the persistence of oxidative behavior, and the oxidation process is most likely controlled by external diffusion, and the associated activation energies (Ea) and the value of k 0 are 29.89 kJ/mol and 0.64, respectively.

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Investigation of the oxidation induration mechanism of Hongge vanadium titanomagnetite pellets with different Al2O3 additions

Cited by 17 publications

References 30 publications

Investigate the oxidation induration mechanism of manganese-bearing magnetite concentrate pellets

Investigate the oxidation induration mechanism of manganese-bearing magnetite concentrate pellets

Effect of TiO₂ during Oxidation Roasting Process of Pellet: Kinetic Mechanism and Microstructure

Oxidation kinetics of a low-grade vanadiferous titanomagnetite concentrate with high titanium

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Investigation of the oxidation induration mechanism of Hongge vanadium titanomagnetite pellets with different Al2O3 additions

Cited by 17 publications

References 30 publications

Investigate the oxidation induration mechanism of manganese-bearing magnetite concentrate pellets

Investigate the oxidation induration mechanism of manganese-bearing magnetite concentrate pellets

Effect of TiO2 during Oxidation Roasting Process of Pellet: Kinetic Mechanism and Microstructure

Oxidation kinetics of a low-grade vanadiferous titanomagnetite concentrate with high titanium

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Product

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Effect of TiO₂ during Oxidation Roasting Process of Pellet: Kinetic Mechanism and Microstructure