Al2O3含量变化对CaO–SiO2–Cr2O3–Al2O3熔渣粘度及结构的影响

袁方; 赵峥; 张延玲; 吴拓

doi:10.1007/s12613-021-2306-2

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(8): 1522-1531

Fang Yuan, Zheng Zhao, Yanling Zhang, and Tuo Wu, Effect of Al₂O₃ content on the viscosity and structure of CaO–SiO₂–Cr₂O₃–Al₂O₃ slags, Int. J. Miner. Metall. Mater., 29(2022), No. 8, pp. 1522-1531. https://doi.org/10.1007/s12613-021-2306-2

Cite this article as:

Fang Yuan, Zheng Zhao, Yanling Zhang, and Tuo Wu, Effect of Al2O3 content on the viscosity and structure of CaO–SiO2–Cr2O3–Al2O3 slags, Int. J. Miner. Metall. Mater., 29(2022), No. 8, pp. 1522-1531. https://doi.org/10.1007/s12613-021-2306-2

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研究论文

Al₂O₃含量变化对CaO–SiO₂–Cr₂O₃–Al₂O₃熔渣粘度及结构的影响

北京科技大学钢铁冶金新技术国家重点实验室, 北京 100083, 中国

通讯作者:
张延玲 E-mail: zhangyanling@metall.ustb.edu.cn

文章亮点

(1) 系统地测量了CaO–SiO₂–Cr₂O₃–Al₂O₃熔渣的粘度。

(2) 探索了Al₂O₃含量变化时熔渣粘度及结构的变化规律。

(3) 阐述了硅酸盐结构及铝酸盐结构变化与CaO–SiO₂–Cr₂O₃–Al₂O₃熔渣的粘度之间的关系。

中文摘要

熔渣粘度对冶炼过程中渣金反应的传质有着至关重要的作用，适当的熔渣粘度能够有效促进渣金反应，提升传质效率。为了促进含铬熔渣中铬的回收利用，本文使用柱体旋转法研究了Al₂O₃含量变化对CaO-SiO₂-Cr₂O₃-Al₂O₃渣粘度和结构的影响规律。熔渣在高温下表现出良好的牛顿流体行为。当Al₂O₃含量从0%增加到10wt%时，酸性渣的粘度首先从0.825增加到1.141 Pa·s，然后当Al₂O₃含量进一步增加到15wt%时，粘度降低到1.071 Pa·s。当Al₂O₃含量从0增加到15wt%时，碱性炉渣的粘度首先从0.084增加到0.158Pa·s，然后当Al₂O₃含量进一步增加到20wt%时，粘度降低到0.135 Pa·s。此外，含Cr₂O₃的炉渣比无Cr₂O₃的炉渣需要更少的Al₂O₃才能达到最大粘度；对于酸性和碱性炉渣，熔渣粘度达到最大值所需的Al₂O₃含量分别为10%和15%。熔渣的活化能变化规律与粘度结果一致。拉曼光谱表明，熔渣中仅有少量Al₂O₃时，Al以[AlO₄]四面体形式出现，随着Al₂O₃含量的逐渐增加，[AlO₄]四面体被[AlO₆]八面体所取代，对硅酸盐结构的分峰解谱结果也与粘度结果一致。

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Research Article

Effect of Al₂O₃ content on the viscosity and structure of CaO–SiO₂–Cr₂O₃–Al₂O₃ slags

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Abstract

Abstract

The effect of Al₂O₃ content on the viscosity and structure of CaO–SiO₂–Cr₂O₃–Al₂O₃ slags was investigated to facilitate recycling of Cr in steelmaking slags. The slags exhibit good Newtonian behavior at high temperature. The viscosity of acidic slag first increases from 0.825 to 1.141 Pa·s as the Al₂O₃ content increases from 0 to 10wt% and then decreases to 1.071 Pa·s as the Al₂O₃ content increases further to 15wt%. The viscosity of basic slag first increases from 0.084 to 0.158 Pa·s as the Al₂O₃ content increases from 0 to 15wt% and then decreases to 0.135 Pa·s as the Al₂O₃ content increases further to 20wt%. Furthermore, Cr₂O₃-containing slag requires less Al₂O₃ to reach the maximum viscosity than Cr₂O₃-free slag; the Al₂O₃ contents at which the behavior changes are 10wt% and 15wt% for acidic and basic slags, respectively. The activation energy of the slags is consistent with the viscosity results. Raman spectra demonstrate that [AlO₄] tetrahedra appear initially and were replaced by [AlO₆] octahedra with further addition of Al₂O₃. The dissolved organic phosphorus content of the slag first increases and then decreases with increasing Al₂O₃ content, which is consistent with the viscosity and Raman results.
- viscosity;
- structure;
- Cr-containing slag;
- Raman spectra

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