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In Situ Observation of Dissolution Behavior of Aluminum Oxide and Nitride in CaO–Al2O3 Slag.

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Title: In Situ Observation of Dissolution Behavior of Aluminum Oxide and Nitride in CaO–Al2O3 Slag.
Authors: Zang, Xu1,2 (AUTHOR), Liu, Chengjun1,2 (AUTHOR) liucj@smm.neu.edu.cn, Wang, Yeguang1,2 (AUTHOR)
Source: Steel Research International. Mar2026, Vol. 97 Issue 3, p1454-1466. 13p.
Subjects: Aluminum oxide, Aluminum nitride, Diffusion coefficients, Gas phase reactions, Mass transfer, Confocal microscopy, Slag, Solubilization
Abstract: In this study, the dissolution behavior of Al2O3 and AlN inclusions in CaO–Al2O3 slag is investigated. Preliminary experiments are conducted to ensure slag homogeneity and AlN stability. Subsequently, the dissolution process of inclusions is investigated through confocal laser scanning microscopy. The dissolution process of Al2O3 inclusion is direct, and no detectable intermediate phase forms during the process. In contrast, the AlN inclusion shows a very intense gas reaction with slag during the dissolution process. Based on the inclusion dissolution mechanism, the Al2O3 directly dissolves as (Al2O3) molecules into the slag. However, AlN might undergo an indirect dissolution process within the slag. The initial reaction between AlN and (O2) from the slag phase results in the formation of N2 bubbles and Al2O3. Subsequently, the Al2O3 dissolves as (Al2O3) into the slag, and partial N2 bubbles diffuse into the slag. The rate limiting step of AlN and Al2O3 dissolution is both distance‐limited mass transfer in the slag, while the mass transfer distance of AlN is longer than that of Al2O3. The calculated mass diffusion coefficient of AlN (DAlN = 6.56 × 10−9 m2 s−1) is significantly smaller than that of Al2O3 (DAl2O3 = 4.56 × 10−8 m2 s−1). [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:In this study, the dissolution behavior of Al2O3 and AlN inclusions in CaO–Al2O3 slag is investigated. Preliminary experiments are conducted to ensure slag homogeneity and AlN stability. Subsequently, the dissolution process of inclusions is investigated through confocal laser scanning microscopy. The dissolution process of Al2O3 inclusion is direct, and no detectable intermediate phase forms during the process. In contrast, the AlN inclusion shows a very intense gas reaction with slag during the dissolution process. Based on the inclusion dissolution mechanism, the Al2O3 directly dissolves as (Al2O3) molecules into the slag. However, AlN might undergo an indirect dissolution process within the slag. The initial reaction between AlN and (O2) from the slag phase results in the formation of N2 bubbles and Al2O3. Subsequently, the Al2O3 dissolves as (Al2O3) into the slag, and partial N2 bubbles diffuse into the slag. The rate limiting step of AlN and Al2O3 dissolution is both distance‐limited mass transfer in the slag, while the mass transfer distance of AlN is longer than that of Al2O3. The calculated mass diffusion coefficient of AlN (DAlN = 6.56 × 10−9 m2 s−1) is significantly smaller than that of Al2O3 (DAl2O3 = 4.56 × 10−8 m2 s−1). [ABSTRACT FROM AUTHOR]
ISSN:16113683
DOI:10.1002/srin.202500686