Title

STRUCTURE AND VISCOSITY OF ALUMOSILICATE MELTS 1 CALCULATED FROM THE THERMODYNAMIC DESCRIPTION

STRUCTURE AND VISCOSITY OF ALUMOSILICATE MELTS 1 CALCULATED FROM THE THERMODYNAMIC DESCRIPTION

Authorship

Grundy, A. N.; Liu, H.; Jung, I.-H.; Decterov, S.; Pelton, A. D.

DOI

10.5151/2594-5327-0172

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Abstract

Silicate systems are of fundamental importance for many metallurgical processes for the glass industry and also for many aspects of geology. In addition to knowledge of the phase relations, there are many properties of the liquid phase such as molar volume, surface tension, absorption coefficient, thermal conductivity and viscosity that are important for understanding, simulating and modeling processes involving silicate liquids. Over the past several years, through critical evaluation of all available thermodynamic and phase equilibrium data, we have developed a quantitative thermodynamic description of multicomponent silicate melts using the Modified Quasichemical Model for short-range ordering. We find that the local structure of the liquid, in terms of the bridging behavior of oxygen, calculated using our thermodynamic description allows us to link the viscosity and the thermodynamics of the silicate liquid. We can thus simultaneously calculate phase relations, thermodynamics and viscosity of the liquid over a wide composition and temperature range. In the present work we outline the model using the SiO2-Al2O3-CaO-MgO that is the most important system for metallurgical applications and the SiO2-Al2O3-Na2O system that is fundamental for the glass industry as examples.

 

Silicate systems are of fundamental importance for many metallurgical processes for the glass industry and also for many aspects of geology. In addition to knowledge of the phase relations, there are many properties of the liquid phase such as molar volume, surface tension, absorption coefficient, thermal conductivity and viscosity that are important for understanding, simulating and modeling processes involving silicate liquids. Over the past several years, through critical evaluation of all available thermodynamic and phase equilibrium data, we have developed a quantitative thermodynamic description of multicomponent silicate melts using the Modified Quasichemical Model for short-range ordering. We find that the local structure of the liquid, in terms of the bridging behavior of oxygen, calculated using our thermodynamic description allows us to link the viscosity and the thermodynamics of the silicate liquid. We can thus simultaneously calculate phase relations, thermodynamics and viscosity of the liquid over a wide composition and temperature range. In the present work we outline the model using the SiO2-Al2O3-CaO-MgO that is the most important system for metallurgical applications and the SiO2-Al2O3-Na2O system that is fundamental for the glass industry as examples.

Keywords

Viscosity; Thermodynamic modeling; Silicates.

Viscosity; Thermodynamic modeling; Silicates.