Measurement and Modeling of Thermal Conductivity for Dense Iron Oxide and Porous Iron Ore Aggliomerates in Stepwise Reduction.

Akiyama, Tomohiro; Ohta, Hiromichi; Takahashi, Ryota; Waseda, Yoshio; Yagi, Jun‐ichiro

doi:10.2355/isijinternational.32.829

Cited by 108 publications

(81 citation statements)

References 1 publication

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“…2) Akiyama et al 3,4) measured the thermal conductivity of iron ore by laser flash method and co-related it to porosity. Kasai and Murayama 5) reported an increase in thermal conductivity with decrease in porosity for coke pellets.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity and Diffusivity of Iron Ore Pellet Having Low Porosity.

Sundarmurti

Rao

2002

ISIJ International

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Section: Introductionmentioning

confidence: 99%

Thermal Conductivity and Diffusivity of Iron Ore Pellet Having Low Porosity.

Sundarmurti

Rao

2002

ISIJ International

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“…Akiyama et al [2] studied temperature dependency of thermal conductivity of iron ore agglomerates. Thermal conductivities of dense pure hematite, magnetite, wu¨stite, and metallic iron were measured as a function of temperature, and a linear relationship between thermal resistivity (reciprocal of thermal conductivity) and temperature was proposed.…”

Section: Recently Carbothermic Reduction Processesmentioning

confidence: 99%

Changes in Effective Thermal Conductivity During the Carbothermic Reduction of Magnetite Using Graphite

Kiamehr

Ahmed

Nurni

et al. 2017

Metall Mater Trans B

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Knowledge of the effective thermal diffusivity changes of systems undergoing reactions where heat transfer plays an important role in the reaction kinetics is essential for process understanding and control. Carbothermic reduction process of magnetite containing composites is a typical example of such systems. The reduction process in this case is highly endothermic and hence, the overall rate of the reaction is greatly influenced by the heat transfer through composite compact. Using Laser-Flash method, the change of effective thermal diffusivity of magnetite-graphite composite pellet was monitored in the dynamic mode over a pre-defined thermal cycle (heating at the rate of 7 K/min to 1423 K (1150°C), holding the sample for 270 minutes at this temperature and then cooling it down to the room temperature at the same rate as heating). These measurements were supplemented by Thermogravimetric Analysis under comparable experimental conditions as well as quenching tests of the samples in order to combine the impact of various factors such as sample dilatations and changes in apparent density on the progress of the reaction. The present results show that monitoring thermal diffusivity changes during the course of reduction would be a very useful tool in a total understanding of the underlying physicochemical phenomena. At the end, effort is made to estimate the apparent thermal conductivity values based on the measured thermal diffusivity and dilatations.

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“…It may be caused by some error in the estimation of apparent thermal conductivity inside the pellet. In the present model, it is estimated by referring the calculation method 6) of thermal diffusivity applied to a porous hematite, but further examination is necessary on its validity.…”

Section: Temperature Measurements Of the Sintering Bed And Pellet Anmentioning

confidence: 99%

Design of Bed Structure Aiming the Control of Void Structure Formed in the Sinter Cake

Kasai

Komarov

Nushiro³

et al. 2005

ISIJ Int.

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Measurement and Modeling of Thermal Conductivity for Dense Iron Oxide and Porous Iron Ore Aggliomerates in Stepwise Reduction.

Abstract: Temperature dependenceof thermal conductivities of dense pure iron oxides and iron.

Cited by 108 publications

References 1 publication

Thermal Conductivity and Diffusivity of Iron Ore Pellet Having Low Porosity.

Thermal Conductivity and Diffusivity of Iron Ore Pellet Having Low Porosity.

Changes in Effective Thermal Conductivity During the Carbothermic Reduction of Magnetite Using Graphite

Design of Bed Structure Aiming the Control of Void Structure Formed in the Sinter Cake

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