Reduction kinetics of zinc oxide with metallic iron under nitrogen stream

Satoshi Itoh, Kazuyuki Abe, Takeshi Azakami

Research output: Contribution to journalArticlepeer-review

Abstract

In order to clarify the reduction rate of zinc oxide with metallic iron under nitrogen stream, kinetic experiments were carried out in the temperature range between 1223 and 1373 K. Experimental data were analyzed in terms of the mixed-control kinetics based on the isothermal shrinking unreacted-core model, in which activities of ZnO and FeO were taken into account. The rate parameters were then determined. The reaction rate constant k c and the effective diffusivity D e are represented by the following equations: k c/mol·m -2·s -1=exp{-185.2 × 10 3/(RT)+13.72} D e/m 2·s -1=exp {-3433/T -8.620} where R is the gas constant. The activation energy of the reaction was 185 kJ·mol -1. The calculated reduction curves by using the rate parameters based on the shrinking unreacted-core model finely reproduced the experimental data. At temperature of only 50 K higher, the reaction rate of zinc oxide with metallic iron under nitrogen stream was comparable with that under vacuum.

Original languageEnglish
Pages (from-to)74-88
Number of pages15
JournalMetallurgical Review of MMIJ (Mining and Metallurgical Institute of Japan)
Volume14
Issue number2
Publication statusPublished - 1997 Dec
Externally publishedYes

Keywords

  • Iron-Reduction Distillation Process
  • Mixed-Control Kinetics
  • Rate-Determining Step
  • Reduction Kinetics
  • Shrinking Unreacted-Core Model
  • Zinc Oxide

ASJC Scopus subject areas

  • Metals and Alloys

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