A Kinetic study of the effect of ZrO2 and CaO/Al 2O3 ratios on the crystallization behavior of a CaO-Al2O3-based slag system

Binbin Jiang, Wanlin Wang, Il Sohn, Juan Wei, Lejun Zhou, Boxun Lu

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The crystallization behavior of a CaO-Al2O3-based slag system with various ZrO2 content (from 1 to 5 wt pct) and CaO/Al2O3 (C/A) ratio (from 0.8 to 1.2) has been studied by using single hot thermocouple technology (SHTT) in this article. The continuous-cooling-transformation (CCT) diagrams and time-temperature- transformation (TTT) diagrams of the above slag system were constructed for the analysis of the varying crystallization behaviors. The results suggested that Al2O3 tended to enhance the slag samples crystallization when the C/A ratio ranged from 0.8 to 1.2, and the critical cooling rate and crystallization temperature increased with the decrease of C/A ratio; meanwhile, the incubation time was also getting shorter with the reduction of C/A ratio. The addition of ZrO2 would enhance the crystallization of slag samples because of the induced heterogeneous nucleation of molten slag. However, the general crystallization was determined by the balance between molten slag viscosity and heterogeneous nucleation, such that Sample 3 (C/A = 1.0, ZrO 2 = 3 pct, B2O3 = 10 pct, Li2O = 3 pct [in wt pct]) would demonstrate the strongest crystallization kinetics in a high-temperature zone. The different crystals formed during the tests were also analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD).

Original languageEnglish
Pages (from-to)1057-1067
Number of pages11
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume45
Issue number3
DOIs
Publication statusPublished - 2014 Jun

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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