Thermodynamics of Calcium Ferrite Slags at 1200 and 1300°

Takeda, Yoichi; Nakazawa, Shigeatsu; Yazawa, Akira

doi:10.1179/cmq.1980.19.3.297

Cited by 72 publications

(57 citation statements)

References 9 publications

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“…From these equations, all the thermodynamic properties and phase diagrams of simple Tsukihashi. [15] The data of Takeda et al [16] and Takeda [17] in the limiting ternary systems are also shown. The agreement systems can be reproduced and those of multicomponent systems can be predicted.…”

Section: Effect Of Oxygen On the Liquidus Surface Of Feo-fe 2 O mentioning

confidence: 83%

“…First, it considerably reduces Some other experimental data on the liquid regions of this system at 1300 ЊC and oxygen partial pressure of 10 Ϫ7 the amount of the experimental work needed to characterize the aforementioned properties over a wide range of composiatm have been reported by Shigaki et al [18] These data do not agree with the data of Tsukihashi [15] in the quaternary tions and temperatures. Based on the existing experimental data, the model employs thermodynamically and structurally system and those of Takeda et al [16] and Takeda [17] on the limiting ternary systems, which, as shown previously, satiscorrect interpolations and extrapolations to predict the liquidus temperature on several regions of composition and factorily agree with the model. for the slags consisting of iron oxide and silica of composition near Fe 2 SiO 4 regardless of the oxygen potential to which they are exposed.…”

Section: Effect Of Oxygen On the Liquidus Surface Of Feo-fe 2 O mentioning

confidence: 99%

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Liquidus surface of FeO-Fe2O3-SiO2-CaO slag containing Al2O3, MgO, and Cu2O at intermediate oxygen partial pressures

Kongoli¹,

Yazawa

2001

Metall Mater Trans B

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The liquidus surface of the FeO-Fe 2 O 3 -SiO 2 -CaO system is of special importance in general pyrometallurgy. It determines several industrial slags, such as "fayalite" slag, calcium ferrite slag, acidic and basic steelmaking slags, as well as the newly proposed "ferrous calcium silicate slags" (FCS), which are all nominally based on this system. Nevertheless, the liquidus surface of this system has been studied only in equilibrium with metallic iron or in air, and the data at intermediate oxygen partial pressures are almost missing. In reductive smelting processes, the aforementioned slags were based on the liquidus surface of the FeO-Fe 2 O 3 -SiO 2 -CaO system in equilibrium with metallic iron. In oxidative matte smelting and in today's modern trends of nonferrous smelting, such as continuous converting or white metal production, the characterization of the liquidus surface of this system at intermediate oxygen partial pressures becomes imperative. Furthermore, the effect of minor oxides on the liquidus surface of this system has not been studied at higher oxygen potentials and confusing conclusions are found in literature even for low oxygen potentials. In this work, a quantitative description of the liquidus surface of FeO-Fe 2 O 3 -SiO 2 -CaO slag containing Al 2 O 3 , MgO, and Cu 2 O is carried out by means of a thermodynamic model at various intermediate oxygen partial pressures. Through a new type of easy-to-understand multicomponent phase diagram, it is shown that important differences exist between the liquidus surfaces of this system in reductive and oxidative conditions. It is also shown that minor components can have fundamentally different effects in reductive and oxidative conditions.

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Section: Effect Of Oxygen On the Liquidus Surface Of Feo-fe 2 O mentioning

confidence: 83%

Section: Effect Of Oxygen On the Liquidus Surface Of Feo-fe 2 O mentioning

confidence: 99%

Liquidus surface of FeO-Fe2O3-SiO2-CaO slag containing Al2O3, MgO, and Cu2O at intermediate oxygen partial pressures

Kongoli¹,

Yazawa

2001

Metall Mater Trans B

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“…The data are for FeO x -CaO (29 to 32 pct) as pCO 2 /pCO, in comparison with iron-oxide slags. at 1300 ЊC, [8] FeO x -CaO-SiO 2 (CaO/SiO 2 ϭ 2) at 1450 ЊC, [18] FeO x -CaOSiO 2 -Al 2 O 3 (CaO/SiO 2 ϳ 1) at 1350 ЊC, FeO x -CaO-SiO 2 -Al 2 O 3 (CaO/SiO 2 ϳ 0.45, 7 pct FeO x ) at 1450 ЊC [17] and FeO x -SiO 2 (30 to 40 pct SiO 2 ) at 1350 ЊC. [9] The equilibrium Fe 3ϩ /Fe 2ϩ ratio in slags as a function of oxygen activity defined as pCO 2 /pCO, in low iron slags.…”

Section: Metals In Slagsmentioning

confidence: 98%

“…and in many cases to have demonstrated that there are many For liquid iron oxide, [6] lime-saturated calcium ferrite, [7,8] more facets in the kinetics of steelmaking reactions. There and silica-saturated iron silicate, [9] it has been shown [10,11] are more challenges, more intricacies to these metallurgical that the Fe 3ϩ /Fe 2ϩ ratio is approximately proportional to reactions than just "simple" mass or heat transport domi-(a O ) 0.5 .…”

Section: Introductionmentioning

confidence: 97%

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Redox equilibria and kinetics of gas-slag reactions

Sun¹,

Jahanshahi²

2000

Metall Mater Trans B

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Measurements of redox equilibria involving a number of transition metals (Fe, Mn, Ti, and V) are summarized and discussed with respect to the effects of oxygen activity and chemistry of the melts on the oxidation state of the transition metal oxide. Recently measured data on kinetics of CO-CO 2 on surfaces of calcium silicate-based slags containing 1 to 68 wt pct FeO x or 18 to 38 wt pct MnO x are presented and discussed in terms of the limiting steps and the dependence of the limiting step on concentration of the transition metal oxides in the melts. Similar data on nonferrous-type slags containing PbO, ZnO, or TiO x in the presence or absence of FeO x are also reviewed. The review also includes recent investigations of the effects of iron oxide on the diffusivity of iron and oxygen in slags.

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Bosh Slag Chemistry Control for High PCR and Low Slag Volume Blast Furnace Operation

Sangbong

2003

steel research international

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For the high pulverized‐coal ratio (PCR) operation in the blast furnace, the slag volume should be minimized to secure good gas/liquid permeability in the low part of the blast furnace. As a measure of slag volume reduction, the MgO content in the sinter has been reduced to the level of 5%. As the slag volume is reduced, the chemistry of slags formed is expected to be changed. Using the tuyere probing technique in the field trials, the effects of slag volume reduction on the slag chemistry was studied. Based upon the analysis of the field trial data as well as laboratory experiment results, it is elucidated that the enhanced gas/liquid permeability is attributed not only to the slag volume reduction but also to the decrease of bosh slag viscosity. By lowering MgO content in the sinter, the bosh slag viscosity can be effectively decreased leading to a stable high PCR/low slag volume operation of the blast furnace.

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Thermodynamics of Calcium Ferrite Slags at 1200 and 1300°

Cited by 72 publications

References 9 publications

Liquidus surface of FeO-Fe2O3-SiO2-CaO slag containing Al2O3, MgO, and Cu2O at intermediate oxygen partial pressures

Liquidus surface of FeO-Fe2O3-SiO2-CaO slag containing Al2O3, MgO, and Cu2O at intermediate oxygen partial pressures

Redox equilibria and kinetics of gas-slag reactions

Bosh Slag Chemistry Control for High PCR and Low Slag Volume Blast Furnace Operation

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