Al2O3夹杂物在CaO–MgO–SiO2–Al2O3–TiO2系精炼渣中的溶解行为

邓志银; 张小萌; 郝广御; 魏春新; 朱苗勇

doi:10.1007/s12613-023-2817-0

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Zhiyin Deng, Xiaomeng Zhang, Guangyu Hao, Chunxin Wei, and Miaoyong Zhu, Dissolution behavior of Al₂O₃ inclusions into CaO–MgO–SiO₂–Al₂O₃–TiO₂ system ladle slags, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2817-0

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Zhiyin Deng, Xiaomeng Zhang, Guangyu Hao, Chunxin Wei, and Miaoyong Zhu, Dissolution behavior of Al2O3 inclusions into CaO–MgO–SiO2–Al2O3–TiO2 system ladle slags, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2817-0

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研究论文

Al₂O₃夹杂物在CaO–MgO–SiO₂–Al₂O₃–TiO₂系精炼渣中的溶解行为

1)
东北大学多金属共生矿生态化冶金教育部重点实验室, 沈阳 110819, 中国
2)
东北大学冶金学院, 沈阳 110819, 中国
3)
特变电工沈阳变压器集团有限公司, 沈阳 110141, 中国
4)
鞍钢股份有限公司, 鞍山 114021, 中国

文章亮点

(1) 分析了Al₂O₃夹杂物在CaO–MgO–SiO₂–Al₂O₃–TiO₂系精炼渣中溶解的限制性环节。

(2) 计算了Al₂O₃在CaO–MgO–SiO₂–Al₂O₃–TiO₂系精炼渣中的扩散系数。

(3) 讨论了渣中TiO₂含量对Al₂O₃夹杂物溶解速率的影响机制。

中文摘要

在含钛铝镇静钢精炼过程中，钢液中的钛元素因钢–渣反应会向精炼渣中迁移，从而形成CaO–MgO–SiO₂–Al₂O₃–TiO₂系精炼渣，降低了钛的收得率。部分学者提出在精炼渣中添加少量TiO₂来提高钛收得率。为了揭示精炼渣中的TiO₂对夹杂物去除行为的影响规律，本文采用高温激光共聚焦显微镜观察了Al₂O₃夹杂物在含TiO₂精炼渣（w(TiO₂)= 0–10wt%）中的溶解行为，并利用扫描电子显微镜分析了Al₂O₃夹杂物与含TiO₂精炼渣的界面反应行为。研究表明，Al₂O₃夹杂物在溶解过程中，并不会在夹杂物与实验精炼渣的边界生成新的物相，且实验精炼渣中的TiO₂不会改变夹杂物的溶解机理，即边界层扩散是Al₂O₃夹杂物溶解的限制性环节。计算表明，在1450–1500°C时，边界层Al₂O₃的扩散系数在4.18 × 10⁻¹⁰和2.18 × 10⁻⁹ m²/s之间。当添加TiO₂后，精炼渣中Al₂O₃的溶解度降低。尽管如此，相比Al₂O₃的溶解度，精炼渣的黏度和温度对Al₂O₃夹杂物溶解速率的影响更大，即低黏度和低熔点的精炼渣更有利于Al₂O₃夹杂物溶解。添加适当的TiO₂（如5wt%）可以降低精炼渣的黏度和熔点，从而更有利于Al₂O₃夹杂物的溶解；而TiO₂添加过量时（如10wt%）则作用相反。

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Research Article

Dissolution behavior of Al₂O₃ inclusions into CaO–MgO–SiO₂–Al₂O₃–TiO₂ system ladle slags

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Abstract

Abstract

To investigate the dissolution behaviors of Al₂O₃ inclusions in CaO–5wt%MgO–SiO₂–30wt%Al₂O₃–TiO₂ system ladle slags, confocal scanning laser microscopy was conducted on the slags with different TiO₂ contents (0–10wt%), and scanning electron microscopy was performed to study the interfacial reaction between Al₂O₃ and this slag system. The results disclose that the dissolution of Al₂O₃ inclusions does not result in the formation of new phases at the boundary between the slag and the inclusions. In TiO₂-bearing and TiO₂-free ladle slags, there is no difference in the dissolution mechanism of Al₂O₃ inclusions at steelmaking temperatures. Boundary layer diffusion is found as the controlling step of the dissolution of Al₂O₃, and the diffusion coefficient is in the range of 4.18 × 10⁻¹⁰ to 2.18 × 10⁻⁹ m²/s at 1450–1500°C. Compared with the solubility of Al₂O₃ in the slags, slag viscosity and temperature play a more profound role in the dissolution of Al₂O₃ inclusions. A lower viscosity and a lower melting point of the slags are beneficial for the dissolution. Suitable addition of TiO₂ (e.g., 5wt%) in ladle slags can enhance the dissolution of Al₂O₃ inclusions because of the low viscosity and melting point of the slags, while excessive addition of TiO₂ (e.g., 10wt%) shows the opposite trend.
- inclusions;
- dissolution;
- ladle refining slag;
- titanium dioxide;
- confocal scanning laser microscopy

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