High-temperature viscosity analysis of aluminosilicate melts and the comparison to empirical models
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ORIGINAL ARTICLE
High‑temperature viscosity analysis of aluminosilicate melts and the comparison to empirical models Hyunseok Ko1 · Myounguk Kim1 · Sun‑Min Park1 · Hyung Mi Lim1 Received: 19 May 2020 / Revised: 9 August 2020 / Accepted: 12 August 2020 © The Korean Ceramic Society 2020
Abstract Understanding the high-temperature viscosity of aluminosilicate near liquid–solid transition is important in the metallurgical industry and fiberization processes, but the experimental determination of viscosity is time and cost consuming. To date, a number of viscosity models have been reported, yet their applicability at such temperature remains questionable. In this paper, the high-temperature viscosities of nine aluminosilicate compounds are measured by rheometer FRS 1600, which allows precise measurements under controlled conditions. Both rotational and oscillation modes are utilized to evaluate the shear viscosity and complex viscosity. The measured viscosities are then compared with empirical models in the literature. It is found that the Urbain model and FactSage simulation output reasonable prediction on viscosities for most of compositions, with an order of magnitude error. We also found none of the models showed a good agreement for Fe-rich multicomponent systems, even Kondratiev model of which Fe content was an important design factor. The results suggest that Urbain model and FactSage simulation are a fair choice for approximating the viscosities for aluminosilicate system (35–56 wt% S iO2, 11–20 wt% A l2O3, 6–37 wt% CaO, and 2–10 wt% MgO) at 1150–1400 °C, but the viscosity models have errors at given temperature range due to their limitation in design composition and temperature. Keywords Viscosity · Aluminosilicate · Slag · Empirical model · FactSage
1 Introduction Aluminosilicates is a broad term for materials composed of aluminium, silicon, and oxygen, plus countercations, and its examples include geological aluminosilicates (basalt and kaolin) and industrial byproducts such as slags and fly ashes. The viscosities of aluminosilicates constitute a significant physical property needed for an understanding of the hightemperature industrial processes. One of the processes is the mass transfer phenomena in metallurgical processes, where the floating aluminosilicate slag is tapped out to retrieve the pure iron melt. The understanding of slag viscosity is a crucial factor in designing the steel converter and the refractory lining to prevent wearing [1, 2]. Another categorization of the process is the melt-quench processes, in which mixture of industrial byproducts (e.g. slag and coal ash) and rocks in * Hyung Mi Lim [email protected] 1
Convergence Technology Division, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, Republic of Korea
nature (e.g. basalt, feldspar, etc.) is transformed into fibers via melting [3, 4]. By far, the viscosity of slag has been widely studied to design process parameters to handle the molten slag in the steel manufacturing [5–15]. The viscosity of slag is a co
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