Rate of reduction of chromium ore by liquid iron containing carbon and silicon

Takamitsu Nakasuga, Haiping Sun, Kunihiko Nakashima, Katsumi Mori

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The rate of smelting reduction of top-added chromium ore with fluxes such as SiO2, CaO-SiO2 and Na2B4O7 by liquid iron containing carbon and silicon was measured at 1400 to approximately 1600 °C under an argon atmosphere. Experiments were carried out to examine effects of initial silicon content, temperature, kind of flux additive and amount of flux addition. The rate of reduction increased remarkably with an increase of silicon content in liquid iron. It also increased with the addition of various fluxes Na2B4O7 was found to have the largest promoting effect on the reduction. When fluxes were added, it was observed that they reacted with chromium ore to form liquid slag. Therefore, it was estimated that the reduction took place mainly at the interface between slag and metal. The initial rate of reduction is not affected by the amount of fluxes addition. However, the chromium yield increased with increased amount of fluxes. The effect of temperature on the rate of reduction was significant. The apparent activation energies were about 217 to approximately 320 kJ/mol in the case of formation of liquid slag. The reduction mechanism and the rate-controlling steps were discussed, finally.

Original languageEnglish
Pages (from-to)499-506
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume86
Issue number8
DOIs
Publication statusPublished - Jan 1 2000

All Science Journal Classification (ASJC) codes

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

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