Rate of Reduction of Ferric and Ferrous Oxide from Calcia-Silica-Alumina Slag by Carbon in Liquid Iron.

• Woolley David E.

  Department of Manufacturing Engineering, Boston University

• Pal Uday B.

  Department of Manufacturing Engineering, Boston University

Abstract

Reduction of ferric and ferrous oxide from calcia-silica-alumina slag by carbon in liquid iron has been studied. A base slag (48%CaO-40%SiO₂-12%Al₂O₃) containing iron oxide (less than 16 wt% total iron) was reduced by carbon dissolved in a liquid iron bath (approx. 4 wt% C). The temperature was in the range 1 400-1 600ºC. The reaction rate was calculated from measurements of the total inlet gas flow rate and the CO concentration in the outlet gas stream. Slag and metal samples were taken in some experiments. Two observations are reported: the apparent rate constant decreases as the reaction rate decreases; and most ferric oxide (Fe₂O₃) is reduced before any ferrous oxide (FeO) is reduced. The authors conclude that the apparent rate constant is the mass transfer coefficient for ferrous cations in the slag phase, and that the overall reduction rate is determined by the mass transfer rate of ferrous cations when only ferrous oxide remains in the slag (i.e. all the ferric oxide has been reduced).

Journal

• ISIJ International

  ISIJ International 39 (2), 103-112, 1999

  The Iron and Steel Institute of Japan

Keywords

• ferric cation
• ferrous cation
• ferric oxide
• ferrous oxide
• slag
• iron
• mass transfer
• kinetics
• mass transfer coefficient
• stirring
• CO gas evolution
• reduction
• decarburization

Details

• CRID: 1390282681428876416
• NII Article ID: 10002462183
• NII Book ID: AA10680712
• DOI: 10.2355/isijinternational.39.103
• ISSN: 13475460
• ISSN: 09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational1989/39/2/39_2_103/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed