Influence of manganese oxide on the liquid-perovskite equilibrium in the CaO–SiO2–TiO2 system at 1400 °C in air

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

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

In the Selective Crystallization and Phase Separation (SCPS) process, manganese oxide is used as an additive to promote the precipitation of perovskite. However, the influence of manganese oxide on the liquid domain of the perovskite primary phase field is still unclear. In the present work, the liquid-perovskite equilibrium with the addition of 0–15 wt% Mn3O4 was experimentally determined using a high-temperature isothermal equilibration-quenching technique, combined with X-Ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDS). It was confirmed that manganese was mainly existed as Mn2+ and Mn3+ in the molten phase, whereas titanium existed as Ti4+. Within the composition range of the present study, the 1400 °C liquid compositions varying from 0 wt% to 15 wt% Mn3O4 overlapped significantly, mainly located at w (CaO)/w (SiO2) ratios between 0.9 and 1.1. The isotherms simulated by FactSage, as well as the data from the literature, generally agreed well with the present experimental results. The calculated 1400 °C isotherms at different Mn3O4 levels indicated that perovskite precipitation by manganese oxide was mainly promoted by increasing the Mn3O4 concentration to expand the primary phase field of perovskite toward both higher and lower TiO2 content areas.

Original languageEnglish
Pages (from-to)11176-11182
Number of pages7
JournalCeramics International
Volume47
Issue number8
Early online date30 Dec 2020
DOIs
Publication statusE-pub ahead of print - 30 Dec 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Equilibrium
  • Perovskite
  • Phase diagram
  • Recovery
  • Titania-bearing slag

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