Effect of TiO2 on the viscosity and slag structure in blast furnace type slags

Hyunsik Park, Jun Young Park, Gi Hyun Kim, Il Sohn

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Abstract

TiO2 additions up to 10mass% behaved as a basic oxide and lowered the viscosity in the CaO-SiO2-17mass% Al2O 3-10mass% MgO-based slags by depolymerizing the silicate network structure. Raman spectroscopy revealed the sum of NBO/Si 1 and 3 decreased while the sum of NBO/Si 2 and 4 increased with TiO2 content. Unlike the silicate structures, the aluminate structures seems to be relatively unaffected by TiO2 additions according to the FTIR results. 5mass% TiO 2 significantly decreased the viscosity compared to the TiO 2 free slags, but beyond 5mass% TiO2 meaningful changes in the viscosity was not observed. From the comparison of the viscosity at constant TiO2 of 5 and 10mass% and varying CaO/SiO2 ratio, increasing the CaO/SiO2 ratio was more effective in decreasing the viscosity than TiO2 additions. TiO2 additions lowered the viscosity of blast furnace type slags by depolymerizing the silicate network, but did not significantly affect the aluminate structures within the slags. TiO2 (5mass%) decreased the viscosity, but higher TiO2 showed no meaningful changes in the viscosity. Increasing the CaO/SiO 2 ratio was more effective in decreasing the viscosity than TiO 2 additions.

Original languageEnglish
Pages (from-to)150-156
Number of pages7
JournalSteel Research International
Volume83
Issue number2
DOIs
Publication statusPublished - 2012 Feb

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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