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Kinetics of Phosphorus Mass Transfer and the Interfacial Oxygen Potential for Bloated Metal Droplets during Oxygen Steelmaking

  • Kezhuan Gu
  • Neslihan Dogan
  • Kenneth S. Coley

Abstract

Knowledge of oxygen potential is crucial for better understanding of fundamentals of refining reactions kinetics within droplets during oxygen steelmaking. In this study, the changes in the phosphorus content of droplets were measured with time using X-ray fluoroscopy technique at 1853K. Specifically, the effects of sulfur content on dephosphorization kinetics of droplets were investigated during periods of intense decarburization. The experimental results showed that the droplets with low sulfur contents (0.007wt%, 0.011wt%) exhibit a lower minimum phosphorous level and an earlier and more significant reversion compared to those with high sulfur contents. The authors suggest that dephosphorisation rate and maximum partition are favored at lower CO evolution rates as well as lower amount of CO gas generation which result in a higher interfacial oxygen potential between slag and bloated droplets. Equating the rate of CO evolution with that of FeO mass transport allowed mass transfer coefficient of FeO to be calculated, which show that FeO mass transport in dense slag is faster than it is in foaming slag.

Keywords

BOF Reaction Kinetics Dephosphorization Mass transfer Metal Droplets Interfacial Oxygen Potential 

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Copyright information

© TMS (The Minerals, Metals & Materials Society) 2016

Authors and Affiliations

  • Kezhuan Gu
    • 1
  • Neslihan Dogan
    • 1
  • Kenneth S. Coley
    • 1
  1. 1.McMaster Steel Research Centre Department of Materials Science and EngineeringMcMaster UniversityHamiltonCanada

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