激光共聚焦显微镜原位观察Al2O3 夹杂物在CaO–Al2O3–SiO2渣中的溶解动力学

任昶宇; 黄财德; 张立峰; 任英

doi:10.1007/s12613-021-2347-6

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(2): 345-353

Changyu Ren, Caide Huang, Lifeng Zhang, and Ying Ren, In situ observation of the dissolution kinetics of Al₂O₃ particles in CaO–Al₂O₃–SiO₂ slags using laser confocal scanning microscopy, Int. J. Miner. Metall. Mater., 30(2023), No. 2, pp. 345-353. https://doi.org/10.1007/s12613-021-2347-6

Cite this article as:

Changyu Ren, Caide Huang, Lifeng Zhang, and Ying Ren, In situ observation of the dissolution kinetics of Al2O3 particles in CaO–Al2O3–SiO2 slags using laser confocal scanning microscopy, Int. J. Miner. Metall. Mater., 30(2023), No. 2, pp. 345-353. https://doi.org/10.1007/s12613-021-2347-6

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研究论文

激光共聚焦显微镜原位观察Al₂O₃ 夹杂物在CaO–Al₂O₃–SiO₂渣中的溶解动力学

1)
北京科技大学冶金与生态工程学院, 北京100083, 中国
2)
燕山大学机械学院, 秦皇岛 066004, 中国
3)
首钢京唐钢铁联合有限责任公司, 唐山 063200, 中国
4)
北方工业大学机械与材料工程学院, 北京 100144, 中国

通讯作者:
张立峰 E-mail: zhanglifeng@ncut.edu.cn

任英 E-mail: yingren@ustb.edu.cn

文章亮点

(1) 通过高温激光共聚焦显微镜原位观察了Al₂O₃夹杂物在CaO–Al₂O₃–SiO₂渣中溶解行为。

(2) 应用修正扩散方程预测了精炼渣粘度对Al₂O₃夹杂物溶解速率的定量影响。

(3) 建立了夹杂物溶解预测模型，温度、渣中CaO/Al₂O₃比和颗粒尺寸的影响。

中文摘要

采用高温共聚焦激光扫描显微镜研究了1773至1873 K时在CaO–Al₂O₃–SiO₂渣中Al₂O₃夹杂物的溶解动力学。结果表明，Al₂O₃溶解的控制步骤是其在渣中的扩散。随着渣中CaO/Al₂O₃比例的增加，Al₂O₃夹杂物的溶解曲线与传统边界层扩散模型难以吻合。建立了考虑精炼渣粘度的修正扩散方程，研究了Al₂O₃在渣中的溶解机理。在1773 K至1873 K温度下，Al₂O₃在渣中的扩散系数为2.8 × 10⁻¹⁰至4.1 × 10⁻¹⁰ m²/s。随着温度的升高、CaO/Al₂O₃的增加、粒径的增大，Al₂O₃的溶出速率增大。提出了一个新的模型为$ {v}_{{\mathrm{A}\mathrm{l}}_{2}{\mathrm{O}}_{3}}=0.16\times {R}_{0}^{1.58}\times x\times {\left(T-{T}_{\mathrm{m}\mathrm{p}}\right)}^{1.11} $，预测不同粒径的Al₂O₃夹杂物的溶解速率和总溶解时间。$ {v}_{{\mathrm{A}\mathrm{l}}_{2}{\mathrm{O}}_{3}} $为Al₂O₃的体积溶解速率，μm³/s; R₀ 为夹杂物颗粒的初始粒径；x为CaO/Al₂O₃质量比值; T为温度，K；T_mp为精炼渣的熔点，K。

关键词:

Research Article

In situ observation of the dissolution kinetics of Al₂O₃ particles in CaO–Al₂O₃–SiO₂ slags using laser confocal scanning microscopy

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Abstract

Abstract

The dissolution kinetics of Al₂O₃ in CaO–Al₂O₃–SiO₂ slags was studied using a high-temperature confocal scanning laser microscope at 1773 to 1873 K. The results show that the controlling step during the Al₂O₃ dissolution was the diffusion in molten slag. It was found that the dissolution curves of Al₂O₃ particles were hardly agreed with the traditional boundary layer diffusion model with the increase of the CaO/Al₂O₃ ratio of slag. A modified diffusion equation considering slag viscosity was developed to study the dissolution mechanism of Al₂O₃ in slag. Diffusion coefficients of Al₂O₃ in slag were calculated as 2.8 × 10⁻¹⁰ to 4.1 × 10⁻¹⁰ m²/s at the temperature of 1773–1873 K. The dissolution rate of Al₂O₃ increased with higher temperature, CaO/Al₂O₃, and particle size. A new model was shown to be ${v}_{{\mathrm{A}\mathrm{l}}_{2}{\mathrm{O}}_{3}}=0.16\times {r}_{0}^{1.58}\times $$ {x}^{3.52}\times {\left(T-{T}_{\mathrm{m}\mathrm{p}}\right)}^{1.11} $ to predict the dissolution rate and the total dissolution time of Al₂O₃ inclusions with various sizes, where $ {v}_{{\mathrm{A}\mathrm{l}}_{2}{\mathrm{O}}_{3}} $ is the dissolution rate of Al₂O₃ in volume, μm³/s; x is the value of CaO/Al₂O₃ mass ratio; R₀ is the initial radius of Al₂O₃, μm; T is the temperature, K; T_mp is the melting point of slag, K.
- inclusion;
- dissolution kinetics;
- confocal scanning laser microscope;
- refining slag

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