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In Situ Observation of the Dissolution of Al2O3 Particles in CaO-Al2O3-SiO2 Slags
Metallurgical and Materials Transactions B ( IF 2.4 ) Pub Date : 2021-07-06 , DOI: 10.1007/s11663-021-02256-w
Changyu Ren 1 , Lifeng Zhang 1 , Ji Zhang 2 , Songjie Wu 2 , Pei Zhu 2 , Ying Ren 2
Affiliation  

The dissolution of Al2O3 particles in CaO-Al2O3-SiO2 slags was investigated by confocal scanning laser microscope at the temperature range from 1723 K to 1853 K. It was found that the rate-limiting step was the diffusion in the liquid slag. The dissolution of Al2O3 particles in CaO-Al2O3-SiO2 slags with various temperatures, CaO/Al2O3, and CaO/SiO2 in slag was in situ observed. Increasing the C/A and C/S of slag promoted the absorption of Al2O3 inclusions by the CaO-Al2O3-SiO2 slag, but only if the slag was pure liquid at the refining temperature. A model related to dissolution driving force and slag viscosity was shown to be v = 18.716 × ΔC/η to predict the dissolution rate of Al2O3. Effective binary diffusion coefficients for various CaO-Al2O3-rich slags were obtained using the developed model. The dissolution rate of Al2O3 in CaO-Al2O3-SiO2 slags with low SiO2 content at the steelmaking temperature was predicted.



中文翻译:

原位观察 Al2O3 颗粒在 CaO-Al2O3-SiO2 渣中的溶解情况

在 1723 K 至 1853 K 的温度范围内,通过共聚焦扫描激光显微镜研究了Al 2 O 3颗粒在 CaO-Al 2 O 3 -SiO 2渣中的溶解。发现限速步骤是在液态炉渣。原位观察到Al 2 O 3颗粒在不同温度的CaO-Al 2 O 3 -SiO 2炉渣、CaO/Al 2 O 3和CaO/SiO 2炉渣的溶解。提高渣的C/A和C/S促进Al 2 O的吸收3夹杂物由 CaO-Al 2 O 3 -SiO 2渣组成,但前提是渣在精炼温度下为纯液体。与溶解驱动力和炉渣粘度相关的模型显示为v = 18.716 × Δ C / η以预测 Al 2 O 3的溶解速率。使用开发的模型获得了各种富含 CaO-Al 2 O 3 的炉渣的有效二元扩散系数。Al 2 O 3在CaO-Al 2 O 3 -SiO 2低SiO 2渣中的溶解速率 预测炼钢温度下的含量。

更新日期:2021-07-07
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