The Influence of Oxygen on the Rate of Nitrogen Absorption into Molten Iron and Marangoni Convection.

• Zhu Jun

  Graduate Student, Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology

• Mukai Kusuhiro

  Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology

Abstract

Under the condition of non-induction stirring, the Marangoni convection that occurred in the process of nitrogen absorption into the liquid iron with various oxygen contents was investigated. Using the periscopic high temperature lens and X-ray radiography system, the surface velocity induced by the Marangoni effect due to the nitrogen absorption into liquid iron was observed and the surface velocity was measured. The surface velocity decreased with the increase of oxygen contents. In the present study, the rate of nitrogen absorption into liquid iron containing 20-500 ppm oxygen could be described with a first order rate equation, and the process of nitrogen absorption is dominated by the mass transfer in the liquid iron. The apparent mass transfer coefficient was reduced with increasing oxygen concentration. This is mainly due to the dwindling of the Marangoni convection on the surface of liquid iron.

Journal

• ISIJ International

  ISIJ International 38 (3), 220-228, 1998

  The Iron and Steel Institute of Japan

Keywords

• Marangoni convection
• nitrogen absorption rate
• rate determining step
• non-induction stirring
• oxygen concentration

Details

• CRID: 1390282681429462656
• NII Article ID: 10002458792
• NII Book ID: AA10680712
• DOI: 10.2355/isijinternational.38.220
• ISSN: 13475460
• ISSN: 09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational1989/38/3/38_3_220/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed