Development of a Quasi-chemical Viscosity Model for Fully Liquid Slags in the Al2O3–CaO–‘FeO’–MgO–SiO2 System. The Experimental Data for the ‘FeO’–MgO–SiO2, CaO–‘FeO’–MgO–SiO2 and Al2O3–CaO–‘FeO’–MgO–SiO2 Systems at Iron Saturation

Abstract

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Quasi-Chemical Viscosity Model for Fully Liquid Slag in the Al2O3-CaO-MgO-SiO2 System—Part I: Revision of the Model

“…[1][2][3][4][5][6] The present as well as other structurally based models [8][9][10][11] have advantages over phenomenological models that express viscosity as a function of just composition. The model parameters of the structurally based models bear physical meaning; the values of the parameters obtained from the lower-order systems can be extrapolated into multi-component and higher-order systems where no experimental data are available, enabling predictions to be performed and, in some cases, discrepancies between experimental data to be identified.…”

“…The previous formalism [1][2][3][4][5][6][7] had some limitations in the description of viscosities in complex silicate slag systems and therefore had been critically reviewed and subsequently revised in the present study. A number of further significant improvements introduced into the model are discussed in the following sections.…”

“…A higher power term E SiÀSi;2 a;SiÀSi was previously used [1][2][3][4][5][6] in the expression of E a;SiÀSi to describe experimental data in the SiO 2 -containing systems. More complex terms in the expression of E a;SiÀSi were later introduced [7] for the Na-and K-containing silicate slags.…”

“…The effect of neighboring SUs on a given partial activation energy is expressed as a function of the concentrations of other types of SUs. The partial molar activation energy of each type of SU was previously [1][2][3][4][5][6] expressed using the following Eqs. [3] to [5]:…”

“…Development of a structurally based viscosity model for predictions in the multi-component slag systems valid over wide ranges of compositions and temperatures has been the focus of previous studies [1][2][3][4][5][6][7] ; the present paper describes recent developments of the model formalism and its application for fully liquid silicate slags in the Al 2 O 3 -CaO-MgO-SiO 2 system. Similar to other structurally based viscosity slag models, [8][9][10][11][12] the link of viscosities to the complex internal slag structure at the atomic level improves the predictive capability of slag viscosities.…”