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Insight into Interaction Behavior of CeAlO3 Substrate and CaO
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Dissolution of inclusion in the melt is a common phenomenon in the metallurgy industry. In this article, the dissolution mechanism of CeAlO3 in CaO-Al2O3-Ce2O3-MgO-SiO2 slag is investigated at 1550 °C. After CeAlO3 dissolves into slag, the interfacial microstructure and the concentration profiles of the element between CeAlO3 and slag are observed by scanning electron microscopy-energy dispersive spectroscopy. Results show that an intermediate product CaCeAl3O7 formed during CeAlO3 dissolves into the slag with w(CaO)/w(Al2O3) = 1. There is no intermediate product formed during CeAlO3 dissolves into the slag with w(CaO)/w(Al2O3) above 1.1. With the increase of w(CaO)/w(Al2O3) in the slag, the dissolution of CeAlO3 shifts from an indirect mechanism to a direct mechanism. The dissolution behavior of CeAlO3 in different slags has been discussed based on slag structure. In the first and second stages of dissolution, Ce3+ formed by dissociation of CeAlO3 at the interface diffuses into the slag, and Ca2+ in the slag diffuses to the interface. In the third stage, the solid-phase precipitation when the concentration of Ca2+, Ce3+, and [AlO4]5− satisfies the nucleation concentration of CaCeAl3O7 in the concentration boundary layer (the region with large concentration gradient near the interface). Conversely, the solid-phase precipitation could not occur in the concentration boundary layer.
中文翻译：
熔体中夹杂物的溶解是冶金工业中的常见现象。本文研究了1550℃下CeAlO 3在CaO-Al 2 O 3 -Ce 2 O 3 -MgO-SiO 2渣中的溶解机理。CeAlO 3溶入炉渣后，通过扫描电镜-能谱仪观察了CeAlO 3与炉渣之间的界面微观结构和元素浓度分布。结果表明， CeAlO 3过程中形成的中间产物CaCeAl 3 O 7溶解到炉渣中，w (CaO)/w (Al 2 O 3 )=1。当w (CaO)/ w (Al 2 O 3 )大于1.1时，CeAlO 3溶解到炉渣中时没有中间产物形成。随着渣中w (CaO)/ w (Al 2 O 3 )的增加，CeAlO 3的溶解由间接机制转变为直接机制。根据炉渣结构讨论了CeAlO 3在不同炉渣中的溶解行为。在溶解的第一和第二阶段， CeAlO 3解离形成Ce 3+界面处的Ca 2+ 扩散到炉渣中，炉渣中的Ca 2+扩散到界面。第三阶段，当Ca 2+、Ce 3+和[AlO 4 ] 5−的浓度满足浓度边界层（浓度梯度大的区域） CaCeAl 3 O 7形核浓度时发生固相析出。接口附近）。反之，浓度边界层中则不会发生固相沉淀。 |
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