A Model for Estimation of Viscosity of Molten Silicate Slag
ABSTRACT A model to evaluate the viscosity of silicate melts is proposed on the basis of the bonding states of oxygen, i.e. non-bridging oxygen and free oxygen ions, in the silicate structure, considering the flow mechanism of the melts with the network structure. Gaye's model is applied to evaluate the bonding state of oxygen ions using thermodynamic databases. The present model can reproduce the composition dependence of the viscosities for silicate melts in binary systems with a single model parameter, as well as the composition dependence of the viscosities for ternary systems in a wide composition range.
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ABSTRACT: The current study delivered the measurements of viscosities in the system “FeO”-SiO2 in equilibrium with metallic Fe in the composition range between 15 and 40 wt pct SiO2. The experiments were carried out in the temperature range of 1473 K to 1773 K (1200 °C to 1500 °C) using a rotational spindle technique. An analysis of the quenched sample by electron probe X-ray microanalysis (EPMA) after the viscosity measurement enables the composition and microstructure of the slag to be directly linked with the viscosity. The current results are compared with available literature data. The significant discrepancies of the viscosity measurements in this system have been clarified. The possible reasons affecting the accuracy of the viscosity measurement have been discussed. The activation energies derived from the experimental data have a sharp increase at about 33 wt pct SiO2, which corresponds to the composition of fayalite (Fe2SiO4). The modified quasi-chemical model was constructed in the system “FeO”-SiO2 to describe the current viscosity data.Metallurgical and Materials Transactions B 06/2013; 44(3). DOI:10.1007/s11663-013-9810-3 · 1.46 Impact Factor
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ABSTRACT: A semi-empirical viscosity model was proposed for silicate melts in this paper. The binary silicate melts MO-SiO2 (MO is a bivalent metal oxide) was treated as 2MO center dot SiO2-"SiO2" or "MO"-2MO center dot SiO2 system when X-MO < 0.667 or X-MO > 0.667. Viscous activation energy of silicate melts was divided into three parts which come from the contributions of "SiO2", "MO" and 2MO center dot SiO2. A relationship between pre-exponential factor A and activation energy E in Arrenhius equation was used for silicate melts. The model parameters were extracted from binary silicate melts and applied in ternary or higher order systems. The viscosities of silicate melts within CaO-MgO-MnO-FeO-SiO2 system were estimated using the present model. Good agreements have been achieved between calculated values and measured values. The mean deviation A of present model for slag systems investigated in our study is in the vicinity of 20%.ISIJ International 01/2006; 46(11):1548-1553. DOI:10.2355/isijinternational.46.1548 · 1.07 Impact Factor
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ABSTRACT: A structurally-based quasi-chemical viscosity model for fully liquid slags in the Al2O3 CaO-'FeO'-MgOSiO2 system has been developed. The focus of the work described in the present paper is the analysis of the experimental data and viscosity models in the quaternary system Al2O3 CaO-MgO-SiO2 and its subsystems. A review of the experimental data, viscometry methods used and viscosity models available in the Al2O3 CaO-MgO-SiO2 and its sub-systems is reported. The quasi-chemical viscosity model is shown to provide good agreement between experimental data and predictions over the whole compositional range.ISIJ International 01/2006; 46(3):375-384. DOI:10.2355/isijinternational.46.375 · 1.07 Impact Factor