Kinetics of Oxidation Reaction for Magnetite Pelets

Liang, Ruquan; Yang, Shuo; Yan, Fusheng; He, Jicheng

doi:10.1016/s1006-706x(13)60150-8

Cited by 21 publications

(6 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10,21) It was not difficult to find that at a given particle size, the activation energy of the second stage was always smaller compared with the first stage. This is consistent with previous studies: 22) E A(chemical reaction) > E A(diffusion) . When the temperature was in the high temperature region, the oxidation of iron ore concentrate entered the third stage.…”

Section: The Non-isothermal Oxidation Process Of Iron Oresupporting

confidence: 94%

Effect of Magnetite Concentrate Particle Size on Pellet Oxidation Roasting Process and Compressive Strength

et al. 2022

View full text Add to dashboard Cite

Section: The Non-isothermal Oxidation Process Of Iron Oresupporting

confidence: 94%

Effect of Magnetite Concentrate Particle Size on Pellet Oxidation Roasting Process and Compressive Strength

et al. 2022

View full text Add to dashboard Cite

“…In earlier studies a modified unreacted core shrinking model was used to describe the kinetics during the oxidation of magnetite pellets (Papanastassiou and Bitsianes 1973;Liang et al 2013;Zhu et al 2016). The same model is applied in the current work examine the experimental data obtained from isothermal TG experiments.…”

Section: Kinetic Analysismentioning

confidence: 99%

Section: Modellingmentioning

confidence: 99%

Pre-oxidation treatment of Indian chromite ores: kinetics and phase transformation behavior relevant to ferrochrome manufacturing and pelletization

Biswas

Konar

Kapure

et al. 2018

Mineral Processing and Extractive Metallurgy

View full text Add to dashboard Cite

Oxidation treatment of chromite ores is a commercially applied process for producing mechanically strong pellets for smelting operation in submerged arc furnace. The oxidation behaviour of chromite ores which essentially determines pellet quality bears a strong relationship with ore chemistry, heat treatment, temperature and time. The present study focuses on investigating the relationship between the oxidation behaviours of low FeO Indian chromite ore with process conditions (oxidation temperature and holding time) using a combination of experimental and simulation techniques. Non-isothermal DSC and TG analysis were conducted in temperature range of 100-1100°C to deduce the phase transformations during the oxidation process. In addition, isothermal TG analyses of chromite ores were conducted at 700, 800 and 1000°C with holding time varying between 0 and 180 min. The effect of temperature and time on the phase transformation of chromite spinel to sesquioxide phase was evaluated using XRD, SEM-EDX, and EPMA. Further, thermodynamic calculations were performed using FactSage TM to study the distribution of different elements in chromite and sesquioxide phases during the oxidation process. In addition, kinetic analysis was conducted to investigate the rate controlling phenomena. The results show that phase transformation kinetics are accelerated with increasing temperature and time and 60-120 min oxidation treatment at 1000°C is sufficient to attain equilibrium conditions. The kinetic analysis results in conjunction with experimental oxidation data indicates that phase transformation is both chemical reaction and diffusion controlled.

show abstract

“…Currently, various studies have examined the kinetics of pellet oxidation. [25][26][27][28][29][30][31] Liang et al [25] studied the kinetics of oxidation for magnetite pellets and discovered that the chemical reaction of the surface was dominant up to 750 K, while mass transfer via the gaseous boundary layer was the controlling step above 750 K. Cho et al [28] experimentally addressed the kinetics of magnetite pellet oxidation at the particle scale by assuming a shrinking core mechanism, as well as at the pellet scale, and proved the pellet oxidation model using the concept of grain model idea. Han et al [29] investigated the oxidation kinetics of vanadium-titanium magnetite (VTM) pellets according to the shrinking unreactedcore model and identified the restriction links and apparent activation energy (E) of oxidation in each temperature range.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cr₂O₃ on the Kinetics Mechanism and Microstructure of Pellet During Oxidation Roasting Process

Feng

Tang

Chu

et al. 2023

steel research int.

View full text Add to dashboard Cite

The oxidation process of iron ore with different Cr2O3 contents is separated into two stages. The Coats–Redfern method is applied to conduct the kinetic analysis, and the restriction links between stages I and II correspond to diffusion control. The apparent activation energy (E) progressively decreases at all stages as the contents of Cr2O3 increase, which is favorable for improving the oxidation kinetics. The fluctuation amplitudes of E in stages I and II are 5.450 and 16.021 kJ mol−1, respectively. The interaction of Fe2O3 and Cr2O3 during oxidation forms a Fe–Cr solid solution, which loosens the internal structure of the pellet and thus increases the number and diameters of the inner pores. This phenomenon facilitates the internal diffusion of oxygen and lowers its concentration inside and outside the pellet. Therefore, the utilization of chromium‐bearing iron ore should be comprehensively considered in terms of its kinetics and microstructure.

show abstract

Kinetics of Oxidation Reaction for Magnetite Pelets

Cited by 21 publications

References 2 publications

Effect of Magnetite Concentrate Particle Size on Pellet Oxidation Roasting Process and Compressive Strength

Effect of Magnetite Concentrate Particle Size on Pellet Oxidation Roasting Process and Compressive Strength

Pre-oxidation treatment of Indian chromite ores: kinetics and phase transformation behavior relevant to ferrochrome manufacturing and pelletization

Effect of Cr₂O₃ on the Kinetics Mechanism and Microstructure of Pellet During Oxidation Roasting Process

Contact Info

Product

Resources

About

Kinetics of Oxidation Reaction for Magnetite Pelets

Cited by 21 publications

References 2 publications

Effect of Magnetite Concentrate Particle Size on Pellet Oxidation Roasting Process and Compressive Strength

Effect of Magnetite Concentrate Particle Size on Pellet Oxidation Roasting Process and Compressive Strength

Pre-oxidation treatment of Indian chromite ores: kinetics and phase transformation behavior relevant to ferrochrome manufacturing and pelletization

Effect of Cr2O3 on the Kinetics Mechanism and Microstructure of Pellet During Oxidation Roasting Process

Contact Info

Product

Resources

About

Effect of Cr₂O₃ on the Kinetics Mechanism and Microstructure of Pellet During Oxidation Roasting Process