Reducing Rate of Iron Oxide in Molten Slag by Carbon in Iron Melt

Sato, Akira; Aragane, Goro; Hirose, Fumio; Nakagawa, Ryuichi; Yoshimatsu, Shiro

doi:10.2355/tetsutohagane1955.69.3_384

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…Here, the undissolved CaO is defined as a sphere of uniform size, and the slag volume, V bulk slah (m 3 ), and the sum of the surface area of f-CaO, A f-cao (m 2 ), are calculated by Eqs. ( 10) and ( 15 Here, W s is the total weight of the slag (kg), W m is the weight of the hot metal (60 kg), ρ s is the density of the liquid slag (3 460 kg/m 3 ), 14) V f-cao is the volume of f-CaO (m 3 ), W f-cao is the weight of f-CaO (kg), ρ f-cao is the density of f-CaO (3 346 kg/m 3 ), 12,13) r is the radius of f-CaO (m), and n is the number of free-CaO particles.…”

Section: Calculation Of Overall Reaction Rate Constantmentioning

confidence: 99%

“…Here, the contents in Eq. ( 17) are all weight percent, ρ 2cs is the density of 2CS (3 300 kg/m 3 ), 12,13) and ρ 2cs-3cp is the density of 2CS-3CP (3 195 kg/m 3 ). 12,13) As shown in Fig.…”

Section: Effect Of Slag Viscosity On K Caomentioning

confidence: 99%

“…( 17) are all weight percent, ρ 2cs is the density of 2CS (3 300 kg/m 3 ), 12,13) and ρ 2cs-3cp is the density of 2CS-3CP (3 195 kg/m 3 ). 12,13) As shown in Fig. 16, k cao decreased slightly with increasing slag viscosity at the same volume fraction.…”

Section: Effect Of Slag Viscosity On K Caomentioning

confidence: 99%

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Effect of Lime Dissolution Rate in Slag on Hot Metal Dephosphorization

Kikuchi¹,

Matsui²,

Uchida

2020

ISIJ Int.

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In order to clarify the effect of the lime (CaO) dissolution rate in slag on hot metal dephosphorization, a 150 kg scale hot metal dephosphorization experiment was carried out. The rate of decrease of free CaO and the dephosphorization rate were measured while varying the ratio of CaO and SiO 2 , which was defined as basicity.The dephosphorization rate showed its maximum value at basicity of around 1.0. At basicity higher than 1.0, the dephosphorization rate decreased due to poor dissolution of CaO in the flux.A thermodynamic calculation revealed that crystallization of 2CaO•SiO 2 (-3CaO•P 2 O 5 ) in the liquid slag deteriorated CaO dissolution when basicity was higher than 1.5.The mass transfer coefficient of CaO in slag was calculated assuming that the interface between the CaO and liquid slag is saturated with CaO. High basicity showed a low mass transfer coefficient.The apparent slag viscosity was calculated in terms of the solid phase and showed a correlation with the CaO diffusion rate. The CaO diffusion rate in slag decreased with higher values of not only the liquid slag viscosity, but also the solid-liquid coexistent slag viscosity. These results suggest the existence of an optimum basicity for effective CaO dissolution.

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Section: Calculation Of Overall Reaction Rate Constantmentioning

confidence: 99%

Section: Effect Of Slag Viscosity On K Caomentioning

confidence: 99%

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Effect of Lime Dissolution Rate in Slag on Hot Metal Dephosphorization

Kikuchi¹,

Matsui²,

Uchida

2020

ISIJ Int.

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Interfacial kinetics of hydrogen with liquid slag containing iron oxide

Nagasaka

Hino

Ban-Ya

2000

Metall Mater Trans B

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Interfacial kinetics on the hydrogen reduction of liquid Fe t O in Fe t O-M x O y slag (M x O y ϭ CaO, SiO 2 , Al 2 O 3 , and TiO 2 ) has been studied at 1673 K. Because the rate of hydrogen reduction was very fast, the rate was controlled by gas-phase mass transfer under most of the experimental conditions. The effect of CaO or SiO 2 addition on the interfacial chemical reaction rate of hydrogen reduction was empirically evaluated as a function of the ferrous-ferric ratio in the slag. The observed interfacial chemical reaction rates in Fe t O-CaO and Fe t O-SiO 2 slags showed reasonable agreement with the estimated values. Most of the available literature data on the reduction rate of liquid iron oxide by solid carbon, hot metal, and reducing gases were also reviewed and compared with the results of the present work. It was found that the rate of hydrogen reduction of liquid iron oxide slag is much faster than that with other reducing agents such as solid carbon, carbon dissolved in the liquid iron, and CO gas.

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Reduction of Liquid Iron Oxide

Fuwa

1988

Trans. JIM

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Previous kinetic studies on the reduction of liquid iron oxide or iron oxide contained in liquid slag were reviewed, being focussed on experimental procedures.Reduction of liquid wustite with carbon dissolved in liquid iron proceeds faster than with carbon monoxide or solid carbon.Previous works have given much valuable information to understand the complicated reactions, and to show still some problems remained to be solved.

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Reducing Rate of Iron Oxide in Molten Slag by Carbon in Iron Melt

Cited by 4 publications

References 2 publications

Effect of Lime Dissolution Rate in Slag on Hot Metal Dephosphorization

Effect of Lime Dissolution Rate in Slag on Hot Metal Dephosphorization

Interfacial kinetics of hydrogen with liquid slag containing iron oxide

Reduction of Liquid Iron Oxide

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