On the interfacial rate of reaction of CO2 with a calcium ferrite melt

Sun, Shouyi; Sasaki, Yasushi; Belton, G. R.

doi:10.1007/bf02651419

Cited by 33 publications

(45 citation statements)

References 9 publications

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“…Tsukihashi et al 2) measured the reduction rate of molten iron oxide in CO gas conveyed system at 1 723 and 1 873 K. Fine powders of iron oxide were utilized to eliminate the effect of gas phase mass transfer rate on the overall reaction rate of reduction. Nagasaka et al 6) also measured the reduction rate of molten iron oxide contained in an iron crucible under strong CO gas flow by using thermobalance in the temperature range of 1 673 to 1 723 K. Measured reduction rate constants were quite in good agreement with those measured by Tsukihashi et al Meanwhile, the dissociation rates of CO 2 on the surface of molten oxides containing iron oxide have been measured by Sasaki et al, 3) ElRahaiby et al, 7) Sun et al 8) and Mori et al 11) with isotope exchange technique. If the dissociation of CO 2 is the rate determining step of oxidation of molten oxide, the reduction rate could be calculated from the measured dissociation rate constant.…”

Section: Introductionmentioning

confidence: 58%

“…Therefore, oxidation or reduction rates for FeO x -contained molten oxides have been widely investigated. [1][2][3][4][5][6][7][8][9][10][11][12][13] Researches about the reduction rate of FeO x and FeO x -based molten oxides with CO-CO 2 gas have been conducted by many researchers. Tsukihashi et al 2) measured the reduction rate of molten iron oxide in CO gas conveyed system at 1 723 and 1 873 K. Fine powders of iron oxide were utilized to eliminate the effect of gas phase mass transfer rate on the overall reaction rate of reduction.…”

Section: Introductionmentioning

confidence: 99%

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Surface Active Effect of Na2O on the Rate of CO2 Dissociation on the Surface of Molten FeOx-Na2O and FeOx-SiO2-Na2O Systems

Matsuura

Tsukihashi

2005

ISIJ Int.

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Section: Introductionmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Surface Active Effect of Na2O on the Rate of CO2 Dissociation on the Surface of Molten FeOx-Na2O and FeOx-SiO2-Na2O Systems

Matsuura

Tsukihashi

2005

ISIJ Int.

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“…Therefore, it is not unreasonable to also expect a simple dependence of the Fe 3+ /Fe 2+ ratio on pO 2 for copper-containing calcium ferrite slags. Figure 6 shows a plot of corrected Fe 3+ /Fe 2+ ratio against pO 2 , for the present work, and compared to data from Sun et al [21] and the correlation formulated by Takeda et al [17] shown in Eq. [13]:…”

Section: Redox Equilibria Of Copper and Ironmentioning

confidence: 73%

“…Their slags contained between 15 and 30 pct CaO. The data of Sun et al [21] are at two CaO contents, 18.6 and 28.7 pct. The CaO content of slag used in the present work is between 17 and 24 pct, but most of the data points are between 22 and 24 pct.…”

Section: ½13mentioning

confidence: 87%

“…The advantages of calcium ferrite slags over the more conventional iron silicate slags include A lower dissolved copper content at a given activity of copper in slag, [11,12] A higher capacity to dissolve ferric iron and, hence, magnetite, and [13] A higher capacity for some acidic minor elements such as arsenic and antimony. [14,15] Most of the thermodynamic investigations into calcium ferrite slags have concentrated on liquidus boundaries at copper-making temperatures, [10,[16][17][18][19][20] iron redox equilibria, [16][17][18][21][22][23][24] and the solubility of copper in slag. [11,15,19,25,26] Nikolic et al [27] and Hidayat et al [28] investigated the thermodynamics of complex slag systems relevant to modern copper smelting and converting processes as part of a thermodynamic modeling study.…”

Section: Michael Somerville Shouyi Sun and Sharif Jahanshahimentioning

confidence: 99%

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Copper Solubility and Redox Equilibria in Magnesia Saturated CaO-CuOx-FeOx Slags

Somerville

Sun

Jahanshahi

2014

Metall Mater Trans B

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New measurements on solubility of copper and redox equilibria in magnesia-saturated calcium ferrite-based slags are presented. These data were obtained from equilibrium experiments at 1573 K (1300°C) and over a range of oxygen partial pressures of 10 À11 to 10 À5 atm, through equilibrating the slag with metallic copper in magnesia crucibles under a flowing Ar-CO-CO 2 gas mixture. At low oxygen partial pressures, copper was found to dissolve into slag as a univalent species (CuO 0.5 ) with a linear dependence on the oxygen partial pressure (in logarithm), with a slope of 0.23. At higher oxygen partial pressures (>10 À7 atm), the data suggest a divalent copper species becomes significant (CuO) and causes the dependence on oxygen partial pressure to increase. The determination of the Fe 3+ /Fe 2+ ratio in the slag was effected by the cuprous (Cu + ) content, which acts to increase the apparent ferrous (Fe 2+ ) content during acid digestion. A correction procedure was applied to the Fe 3+ /Fe 2+ ratio based on the calculated Cu + content of the slag. The procedure assumes that the activity coefficients of CuO 0.5 and CuO (c CuO 0:5 and c CuO ) in these slags are independent of oxygen partial pressure. The calculated activity coefficients of CuO 0.5 and CuO were 3.43 and 0.29, respectively. The corrected Fe 3+ / Fe 2+ ratio had a linear dependence of 0.17 on the oxygen partial pressure over the entire oxygen partial pressure range. This agrees with similar data from the literature.

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Reaction Kinetics of FeO Containing Molten Slags

Ito

Hamano

Matsuzaki

2003

steel research international

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The kinetic study of FeO-containing slag is valuable if we consider slag-gas and slag-metal reactions in steelmaking process. In the present work, the reduction rate of Fep-Si0 2 -Ti0 2 -MOx (MOx = CaO, MgO, Al0 1 _ 5 , P0 2 _ 5 ) melts in equilibrium with solid iron by CO gas was measured using the thermobalance system at 1673 K. A rate equation was developed based on the results obtained. The mechanisms of the reaction and the effect of P 2 0 5 as a surfactant were discussed. Solid Cao was reacted with FeO-containing slag at 1573 to 1673 K. The CaOslag interface was analyzed by SEM and EDX, and the reacted layers were identified. The rate of solid Cao dissolution into a stagnant FeOcontaining slag at hot-metal temperatures was explained by the FeO diffusion in slag phase.Reaktionskinetik FeO-haltiger flussiger Schlacken. Die kinetische Untersuchung FeO-haltiger Schlacke ist bei der Betrachtung von Schlacke/Gasund Schlacke/Metall-Reaktionen bei der Stahlherstellung von hohem Wert. In der vorliegenden Arbeit wurde die Reduktionsrate von Fep-Si0 2 -Ti0 2 -MOx-Schmelzen (MOx = Cao, MgO, AI0 1 _ 5 , P0 2 _ 5 ), die im Gleichgewicht mit festem Eisen stehen, durch CO-Gas gemessen. HierfOr wurde ein Thermowaagen-System bei 1673 K eingesetzt. Auf Basis der erzielten Ergebnisse wurde eine Gleichung fOr die Reaktionsgeschwindigkeit entwickelt. Die Reaktionsmechanismen und der oberflachenaktive Einfluss von P 2 0 5 wurden erortert. Festes CaO wurde mit FeO-haltiger Schlacke bei 1573 bis 1673 K zur Reaktion gebracht. Die CaO/Schlacke-Grenzflache wurde mit SEM und EDX analysiert, und die Zusammensetzung der ausreagierten Schichten wurde bestimmt. Die Geschwindigkeit, mit der sich festes Cao in einer tragen Schlacke bei Roheisentemperatur lost, wurde mit der FeO-Diffusion in der Schlackenphase erklart.

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On the interfacial rate of reaction of CO2 with a calcium ferrite melt

Cited by 33 publications

References 9 publications

Surface Active Effect of Na2O on the Rate of CO2 Dissociation on the Surface of Molten FeOx-Na2O and FeOx-SiO2-Na2O Systems

Surface Active Effect of Na2O on the Rate of CO2 Dissociation on the Surface of Molten FeOx-Na2O and FeOx-SiO2-Na2O Systems

Copper Solubility and Redox Equilibria in Magnesia Saturated CaO-CuOx-FeOx Slags

Reaction Kinetics of FeO Containing Molten Slags

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