Effect of Cr<sub>2</sub>O<sub>3</sub> Addition on Viscosity and Structure of Ti-bearing Blast Furnace Slag

DOI Web Site 被引用文献7件 参考文献11件
  • Qiu Guibao
    School of Materials Science and Engineering, Chongqing University
  • Chen Long
    Graduate Student, School of Materials Science and Engineering, Chongqing University
  • Zhu Jianyang
    Graduate Student, School of Materials Science and Engineering, Chongqing University
  • Lv Xuewei
    School of Materials Science and Engineering, Chongqing University
  • Bai Chenguang
    School of Materials Science and Engineering, Chongqing University

抄録

The viscous flow of CaO–SiO2–MgO–TiO2–Al2O3–Cr2O3 slag (CaO/SiO2=0.9–1.3, Cr2O3=0–4 mass%) were investigated to promote understanding of the effect of Cr2O3 addition and basicity (CaO/SiO2) on the viscous behavior of slag containing TiO2. The viscosity of slag was found to significantly increase with increasing Cr2O3 content at a fixed basicity. The increase in basicity could alleviate the viscosity of the slag to a particular extent. And this study involved the use of theoretical calculations and experiments to prove that Cr2O3 in the BF slag could easily react with MgO and Al2O3 to generate spinel phase (MgCr2O4, MgCrAlO4) with high melting points, there increasing the viscosity of the slag. The perovskite phase with high melting points is easily crystallized out at high temperatures with increasing Cr2O3 content and basicity which makes the viscosity of the slag increase sharply with increasing the CaO/SiO2 ratio. In addition, this study analyzed the silicate structure of the slag via infrared spectroscopy. The addition of Cr2O3 has little effect on the silicate structure of the slag. The increasing basicity enabled the slag to become simple in structure. However, the viscosity of the slag increased rapidly because of the precipitation of the high melting phase perovskite.

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