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Metallurgical and Materials Transactions B

, Volume 48, Issue 1, pp 346–356 | Cite as

Viscosity Measurement and Structure Analysis of Cr2O3-Bearing CaO-SiO2-MgO-Al2O3 Slags

  • Qiuhan Li
  • Jintao Gao
  • Yanling ZhangEmail author
  • Zhuoqing An
  • Zhancheng Guo
Article

Abstract

In this study, the effects of different Cr2O3 contents and optical basicity (denoted by Λ) on the viscosity and structure of the Cr2O3-bearing CaO-SiO2-MgO-Al2O3 slag were investigated. The viscosities of Cr2O3-bearing CaO-SiO2-MgO-Al2O3 slags in the liquid phase below 1823 K (1550 °C) were measured by rotating-cylinder method, and the structures of the slags were examined via Raman spectroscopy. Three different parameters were used to characterize the structures of the slags. The results showed that the viscosity of the slags increased as the Cr2O3 content increased, but decreased as Λ increased. The Cr3+ ions acted as network formers and increased the degree of polymerization (DOP), and thus, the addition of Cr2O3 to the slag increased the number of bridging oxygen atoms in the silicate structural units. Generally, the viscosity increased by increasing DOP. In addition, there was a linear inverse relationship between the viscous activation energy (E μ ) and Λ. Furthermore, as the Cr2O3 content increased, the gradients of the plots of E μ vs Λ decreased. This indicates that for a slag with a high Cr2O3 content, trying to improve the fluidity of the slag by increasing Λ has a limited effect.

Keywords

Raman Band Relative Fraction Mold Flux Slag Sample Molten Slag 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2016

Authors and Affiliations

  • Qiuhan Li
    • 1
  • Jintao Gao
    • 1
  • Yanling Zhang
    • 1
    Email author
  • Zhuoqing An
    • 1
  • Zhancheng Guo
    • 1
  1. 1.State Key Laboratory of Advanced MetallurgyUniversity of Science & Technology BeijingBeijingChina

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