Effect of Slag Basicity on Alumina Dissolution and Diffusivity: A High-temperature Confocal Laser Scanning Microscopy Study

doi:10.19691/j.cnki.1004-4493.2024.02.005

China's Refractories ›› 2024, Vol. 33 ›› Issue (2): 27-34.DOI: 10.19691/j.cnki.1004-4493.2024.02.005

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Effect of Slag Basicity on Alumina Dissolution and Diffusivity: A High-temperature Confocal Laser Scanning Microscopy Study

Burhanuddin^*, Harald HARMUTH

Montanuniversität Leoben, Leoben 8700, Austria

Online:2024-06-15 Published:2024-07-04
Contact: *e-mail: burhanuddin.burhanuddin@unileoben.ac.at
About author:Burhanuddin obtained his bachelor’s and master’s degrees in ceramics. After graduation, he had worked in an R & D of a refractory raw material company for five years. He received his doctoral degree from Montanuniversitaet Leoben in 2022 and his doctoral thesis was about the quantification of refractory dissolution. Currently he is continuing his research in Montanuniversitaet Leoben.

Abstract

Abstract: Alumina is one of the crucial and extensively utilized refractory components. As the refractory wear due to dissolution at elevated temperatures during operation is a major threat to refractory lifespan, quantifying dissolution is important for developing cost-effective and resource-efficient refractories. This study investigated the dissolution of alumina particles in two silicate and one calcium aluminate slags at 1 450, 1 500, and 1 550 °C using high-temperature confocal laser scanning microscopy (HT-CLSM). Dissolution was quantified in terms of diffusivity, with all influencing factors, including Stefan flow and bath movement, incorporated into the determination process. The trends observed in total dissolution time and diffusivity in three slags at three experimental temperatures could not be explained solely on the basis of slag basicity. Two parameters, considering the influencing factors, were introduced to explain these trends. Furthermore, the linear trend observed in Arrhenius plots of diffusivities supports the diffusivity results. Additionally, good agreement between the diffusivities of alumina in one silicate slag obtained via CLSM and rotating finger test investigations verified the reliability of the results.

Key words: alumina, dissolution, diffusivity, corrosion, refractory

Burhanuddin, Harald HARMUTH. Effect of Slag Basicity on Alumina Dissolution and Diffusivity: A High-temperature Confocal Laser Scanning Microscopy Study[J]. China's Refractories, 2024, 33(2): 27-34.

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Effect of Slag Basicity on Alumina Dissolution and Diffusivity: A High-temperature Confocal Laser Scanning Microscopy Study

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