Development of CO Gas Bottom Blowing Process in Combined Blowing Converter and Its Characteristics in Metallurgical Reaction

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  • 上底吹き転炉におけるCOガス底吹き法の開発と冶金反応特性
  • ウワゾコブキ テンロ ニ オケル CO ガス ソコブキホウ ノ カイハツ ト

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Abstract

In order to use CO gas purified from off gas of a converter as a bottom blowing gas in 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.<BR>In the case of CO gas blowing, 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 and 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 was proposed by considering the oxygen potential in slag. The model can reasonablly explain the experimental results.<BR>Commercial use of CO gas has been started since 1985 in 180 t combined blowing converter at Mizushima Works, and satisfying results have been obtained.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 75 (7), 1146-1153, 1989

    The Iron and Steel Institute of Japan

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