Development of CO gas bottom blowing process in combined blowing converter and its characteristics in metallurgical reaction

Yasuo Kishimoto, Syuji Takeuchi, Yoshiei Kato, Tetsuya Fujii, Hisashi Osanai, Rinzo Tachibana

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Abstract

In order to use CO gas purified from off gas of a converter as a bottom blowing gas in a combined blowing converter, the metallurgical characteristics brought by bottom injected CO gas were examined in a 5 t test converter. There was no appreciable difference in metallurgical reactions between CO gas and N2 or Ar gas. In the case of CO gas blowing, a decrease in the partial pressure, Pco, cannot be expected in comparison with that in the case of N2 or Ar blowing. Nevertheless, decarburization and deoxidation were observed during rinsing. Concentrations of oxygen and carbon after rinsing reduced to those in equilibrium with 0.6 atm of CO. These phenomena cannot be explained by the effect of Pco reduction by bottom blowing gas. On the basis of the experimental results, a new reaction model is proposed by considering the oxygen potential in slag.

Original languageEnglish
Pages (from-to)1146-1153
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume75
Issue number7
DOIs
Publication statusPublished - Jan 1 1989
Externally publishedYes

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ASJC Scopus subject areas

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

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