Kinetics of reduction of SiO2 in SiO2-Al 2O3-CaO slags by Al in Fe-Al(-Si) melts

Jiwon Park, Seetharaman Sridhar, Richard J. Fruehan

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Kinetic models considering mass transport in, (i) metal phase only and (ii) both metal and slag phases (mixed control or two-phase mass transfer) were developed for the reduction of SiO2 in a SiO2-Al 2O3-CaO slag by Al in an Al-Fe melt. The models were validated with experiments of the reaction with Fe-Al melt and SiO 2-Al2O3-CaO-MgOsat slags at 1873 K (1600 °C). The models predict that the rate of reaction is slower in the mixed control model because of the added resistance of slag phase mass transport. The mixed control becomes applicable when the slag contains low amounts of SiO2. In this case, when the initial Al content in the metal increases, the normalized rate of reaction decreases. The increased Al content in the metal retards the reaction due to the limited SiO2 provided to the reaction interface in the mixed control model. Sensitivity analyses were done using the models for the ratios of mass transfer coefficients of Si to Al, and Al2O3 to Si, along with slag density, which did not impose a significant effect.

Original languageEnglish (US)
Pages (from-to)1380-1388
Number of pages9
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume45
Issue number4
DOIs
StatePublished - Aug 2014
Externally publishedYes

ASJC Scopus subject areas

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

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