Effect of additives on the rate of reduction of liquid iron oxide with CO

Tetsuya Nagasaka, Yasutaka Iguchi, Shiro Ban-Ya

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The effect of additives such as CaO, SiO2, MnO, MgO, Na2O, P2O5, Al2O3, TiO2, FeS, CaF2 and CaCl2 on the reduction rate of liquid iron oxide has been measured as a fundamental study for the smelting reduction process. The effect of mass transfer in both the gas and liquid phase on the overall reduction rate was estimated to learn the rate of chemical reaction on the surface. It was found that the reduction rate was greatly affected by the ratio of Fe3+/Fe2+ in the melts. An empirical rate equation was derived to express the rate of chemical reaction on the surface. Since phosphate acted like a surface active species and retarded the reduction rate markedly, the rate equation could not be applied to the liquid iron-phosphate system. The reduction rate of liquid iron oxide containing FeS, CaF2 or CaCl2 was also investigated to discuss the effect of coexisting anions on the chemical reaction rate. It was concluded that the reduction rate was mainly affected by cations and the effect of anions was very small.

Original languageEnglish
Pages (from-to)74-81
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume75
Issue number1
DOIs
Publication statusPublished - 1989 Jan 1

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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