Kinetic Study on Thermal Decomposition Behavior of Hematite Ore Fines at High Temperature

Xing, Liyong; Wang, Chunsong; Shao, Lei; Zou, Zongshu; Song, Wenjun

doi:10.1007/s11663-019-01747-1

Cited by 17 publications

(8 citation statements)

References 32 publications

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“…The decomposition products of hematite at 1400 and 1500 • C are solid magnetite, and liquid magnetite and FeO at 1600 • C [25]. Optical-microscopy observations based on the thermal decomposition process of hematite also indicated that the core unreacted mineral is hematite, and the edge decomposition product is magnetite [29]. The results of the study correspond to the theoretical calculations in Figure 3.…”

Section: The Thermal Decomposition Reaction Mechanism and Influencing...supporting

confidence: 79%

“…The thermal decomposition temperature of hematite is higher than that of goethite. The step-by-step reaction process of the Fe 2 O 3 decomposition is shown in Equations ( 2)-( 4) [29]:…”

Section: The Thermal Decomposition Reaction Mechanism and Influencing...mentioning

confidence: 99%

“…Similarly, in TGA-DSC experiments, the initial decomposition temperature was 1383 • C for 125-250 µm hematite and 1264 • C for 45-53 µm hematite on the basis of a 10 • C/min heating rate, showing that the decomposition temperature increased for the larger iron-ore fines due to the slow heating rate [25]. However, TGA thermal decomposition experiments with different hematite particle sizes of −110 µm were also conducted, and the results showed that the particle size of hematite had no significant effect on the thermal decomposition temperature [29].…”

Section: The Thermal Decomposition Reaction Mechanism and Influencing...mentioning

confidence: 99%

“…(3) Residence time/Heating rate For the decomposition of goethite, an increase in residence time leads to an increase in its weight loss, suggesting that the heating rate is the limiting step in its thermal decomposition. Xing et al [29] showed that the start and end temperatures of the thermal decomposition reaction in the TGA experiments increased with the heating rate. There is hysteresis in the reaction at faster heating rates.…”

Section: The Thermal Decomposition Reaction Mechanism and Influencing...mentioning

confidence: 99%

“…However, two stages of the thermal decomposition of hematite in an inert atmosphere were reported with activation energies of 636 and 325 kJ/mol [33,43]. Xing's results indicated that activation energy for the thermal decomposition of hematite was 1256 kJ/mol with a pre-exponential factor of 1.94 × 10 41 s −1 with the TGA method [29].…”

Section: Rate Controlling Process Kinetic Equation Differential Formmentioning

confidence: 99%

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Study on the Bath Smelting Reduction Reaction and Mechanism of Iron Ore: A Review

Wang

Zhang

Wang

et al. 2023

Metals

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Against the background of low global carbonization, blast furnace ironmaking technology with coking puts huge amounts of pressure on the global steel industry to save energy and reduce emissions due to its high pollution levels and high energy consumption. Bath smelting reduction technology is globally favored and studied by metallurgists as a non-blast furnace ironmaking technology that directly reduces iron ore into liquid metal without using coke as the raw material. The smelting reduction reaction of iron ore, which is the core reaction of the process, is greatly significant to its productivity and energy saving. Therefore, this paper focuses on the behavior and mechanism of iron ore’s smelting reduction. This work focuses on three key aspects of smelting reduction, namely, the thermal decomposition characteristics of iron ore during the smelting reduction, the smelting reduction mechanism of iron-ore particles, and the smelting reduction mechanism of FeO-bearing slag. The experimental study methods, reaction mechanisms, influencing factors, and kinetic behavior of the three are highlighted. In this work, the reaction mechanism of thermal iron-ore decomposition, iron-ore particle smelting reduction, and FeO-bearing slag smelting reduction on the three reactions were observed, providing a theoretical basis for how to select and optimize raw materials for the bath smelting reduction process. Moreover, the kinetic study clarifies the limiting steps of the reactions and provides guidance for an improvement in the reaction rate. However, certain blank points in previous studies need to be further explored, such as the differences in the research results of same factor, the large variation in reaction activation energy, and the coupling mechanism and inter-relatedness of the three key aspects’ reactions with each other.

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Section: The Thermal Decomposition Reaction Mechanism and Influencing...supporting

confidence: 79%

“…The thermal decomposition temperature of hematite is higher than that of goethite. The step-by-step reaction process of the Fe 2 O 3 decomposition is shown in Equations ( 2)-( 4) [29]:…”

Section: The Thermal Decomposition Reaction Mechanism and Influencing...mentioning

confidence: 99%

Section: The Thermal Decomposition Reaction Mechanism and Influencing...mentioning

confidence: 99%

Section: The Thermal Decomposition Reaction Mechanism and Influencing...mentioning

confidence: 99%

Section: Rate Controlling Process Kinetic Equation Differential Formmentioning

confidence: 99%

See 3 more Smart Citations

Study on the Bath Smelting Reduction Reaction and Mechanism of Iron Ore: A Review

Wang

Zhang

Wang

et al. 2023

Metals

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Thermal Decomposition of Hematite Ore Fines in Air

Anand,

Pande,

Kumar

et al. 2024

steel research int.

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Thermal decomposition of hematite plays an important role during pelletization and the iron fine‐based smelting processes such as HIsarna and flash shaft smelter. The temperature at which pure hematite decomposition occurs depends on the partial pressure of oxygen in the gaseous atmosphere. In the air, that is, at = 0.21, the hematite decomposes at 1386 °C. In the present work, for an ore of a given composition, the effect of gangue on the thermal decomposition of hematite is experimentally determined using thermogravimetric analysis (TGA). A decomposition temperature of 1320 °C is found in the platinum crucible after analyzing the TGA curve. Thermodynamic calculations have been carried out using FactSage8.1 to investigate the effect of gangue on the stability of hematite. Thermodynamics calculations confirm that the hematite present in the ore decomposes at a lower temperature with the increase in the gangue content. Additionally, if gangue content can affect the temperature at which dissociation of hematite occurs, it is expected that the crucible material can also affect the dissociation. Interestingly most of the reported TGA experiments are performed either in alumina crucibles or it was not reported in the literature. Therefore, the effect of crucible materials, namely alumina and platinum, is also investigated.

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Volatilization Behavior of Arsenic from a Hematite Ore During Non-isothermal Heating in Argon Atmosphere: An Overview

Chiwandika

Jung

2023

The Minerals, Metals &Amp; Materials Series

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Kinetic Study on Thermal Decomposition Behavior of Hematite Ore Fines at High Temperature

Cited by 17 publications

References 32 publications

Study on the Bath Smelting Reduction Reaction and Mechanism of Iron Ore: A Review

Study on the Bath Smelting Reduction Reaction and Mechanism of Iron Ore: A Review

Thermal Decomposition of Hematite Ore Fines in Air

Volatilization Behavior of Arsenic from a Hematite Ore During Non-isothermal Heating in Argon Atmosphere: An Overview

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