The effect of 15 wt%Al2O3 addition on the equilibrium phase relations of CaO–SiO2–TiO2 system at 1400 °C in air

Xingbang Wan, Junjie Shi*, Yuchao Qiu, Min Chen, Jianzhong Li, Changsheng Liu, Pekka Taskinen, Ari Jokilaakso

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The combined processing of industrial wastes of titania-bearing slags with coal fly ash is an important part of the circular economy. In the present work, the effect of Al2O3 on the 1400 °C liquidus isotherms of the perovskite, rutile and tridymite primary phase fields in the CaO–SiO2–TiO2–Al2O3 system has been determined by employing a high-temperature equilibration-quenching technique, followed by X-ray Photoelectron Spectroscopy and Scanning Electron Microscopy-Energy Dispersive X-ray Spectrometry. Titanium was confirmed to be stable as TiO2 in the present equilibria. The equilibrium solid phases of perovskite CaO·TiO2, rutile TiO2 and tridymite SiO2 were confirmed to be coexisting with the liquid oxide phase. The comparison of the addition of 0–15 wt% Al2O3 was beneficial for expanding the primary phase field of perovskite to lower TiO2 concentrations. Comparisons of the experimental 1400 °C isotherm with the predictions using FactSage and MTDATA databases confirmed some differences to the present experimental data, thus demonstrating the direction for updating the present thermodynamic titania-bearing oxide databases.

Original languageEnglish
Pages (from-to)24802-24808
Number of pages7
JournalCeramics International
Volume47
Issue number17
DOIs
Publication statusAccepted/In press - May 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • AlO
  • FactSage
  • Perovskite
  • Phase diagram
  • Titania-bearing slag
  • Urban mining

Fingerprint

Dive into the research topics of 'The effect of 15 wt%Al<sub>2</sub>O<sub>3</sub> addition on the equilibrium phase relations of CaO–SiO<sub>2</sub>–TiO<sub>2</sub> system at 1400 °C in air'. Together they form a unique fingerprint.

Cite this