Dephosphorization Reaction of Chromium Containing Molten Iron by CaO-based Flux.

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概要

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• Dephosphorization tests of chromium containing molten iron by CaO-based flux have been carried out by an induction furnace. The following results were obtained: (1) When the carbon content in metal was high enough, chromium containing molten iron was able to be dephosphorized by CaO-CaF<SUB>2</SUB>-FeO flux. In this case, oxygen partial pressure at the slag and metal inferface was calculated to be about 10<SUP>-12</SUP> Pa. (2) The higher ratio of CaF<SUB>2</SUB>/(CaO+CaF<SUB>2</SUB>) and of CaO/O in flux were effective for the dephosphorization without the oxidization of chromium. Based on these results, 200 ton scale industrial tests have been carried out by the hot metal pretreatment station at Yawata Works. By the combination of the flux injection method and the oxygen top blowing method, it was clarified that the dephosphorization without chromium oxidation and the suppression of temperature drop were able to be achieved simultaneously.

• The Iron and Steel Institute of Japanの論文

著者

• Aoki Hiroyuki

  Yawata Iron And Steel Co. Ltd.

• Kitamura Shin-ya

  Yawata R & D Laboratory, Central R & D Bureau, Nippon Steel Corporation

• Aoki Hiroyuki

  Yawata Works, Nippon Steel Corporation

• Okohira Kazuo

  Yawata R&D Laboratory, Technical Development Bureau, Nippon Steel Corporation

関連論文

• Development of a Novel Degassing Process Consisting with Single Large Immersion Snorkel and a Bottom Bubbling Ladle
• Peculiarity of Evaporating Liquid-Surface with Reference to Turbulent Heat Transfer
• Dephosphorization Reaction of Chromium Containing Molten Iron by CaO-based Flux.
• Development of Analysis and Control Method for Hot Metal Dephosphorization Process by Computer Simulation.
• Effect of Stirring Energy, Temperature and Flux Composition on Hot Metal Dephosphorization Kinetics.

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