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Metallurgical and Materials Transactions B

, Volume 49, Issue 4, pp 1963–1973 | Cite as

Viscosity of TiO2-FeO-Ti2O3-SiO2-MgO-CaO-Al2O3 for High-Titania Slag Smelting Process

  • Kai Hu
  • Xuewei Lv
  • Shengping Li
  • Wei Lv
  • Bing Song
  • Kexi Han
Article
  • 197 Downloads

Abstract

The present study demonstrates the dependence of viscosity on chemical composition and temperature of high-titania slag, a very important raw material for producing titanium dioxide. The results indicated that completely molten high-titania slag exhibits a viscosity of less than 1 dPa s with negligible dependence on temperature. However, it increases dramatically with decreasing temperature slightly below the critical temperature, i.e., the solidus temperature of the slag. Above the critical temperature, the slag samples displayed the same order of viscosity at 0.6 dPa s, regardless of their compositional variation. However, the FeO, CaO, and MgO were confirmed to decrease viscosity, while SiO2 and Ti2O3 increase it. The apparent activation energy for viscosity-temperature relation and liquidus temperature based on experiments and thermodynamic calculations are also presented. Conclusively, the critical temperatures of the slags are on average 15 K below their corresponding calculated liquidus temperatures. The increase in FeO content was found to considerably lower the critical temperature, while the increase in both Ti2O3 and TiO2 contents increases it. The main phases of the slag in solid state, as indicated by X-ray diffraction, are (Fe, Mg)xTiyO5 (x + y = 3, pseudobrookite) and rutile.

Notes

Acknowledgments

The authors are especially grateful to the Natural Science Foundation of China (No: 51374262). The chemical compositions analysis of all the samples was performed by Panzhihua Iron and Steel Research Institute.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Kai Hu
    • 1
  • Xuewei Lv
    • 1
  • Shengping Li
    • 1
  • Wei Lv
    • 1
  • Bing Song
    • 2
  • Kexi Han
    • 2
  1. 1.School of Materials Science and EngineeringChongqing UniversityChongqingChina
  2. 2.Panzhihua Iron and Steel Research InstitutePanzhihuaChina

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