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Volume 29 Issue 8
Aug.  2022

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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

  • 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。
  • 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。
  • Research Article

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

    + Author Affiliations
    • 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.
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