### Abstract

A three-phase, transient model for hydrogen degassing of molten steel in an argon-stirred, slag-covered ladle has been developed based on the Eulerian method. The slag layer is treated as a separate phase with bubble coalescence and breakup accounted for using a discrete population balance model. A k-e turbulence model with a bubble induced source term is included along with drag, lift, turbulence dispersion, and wall lubrication submodels for the interfacial force terms. The model predictions are validated using industrial data from a vacuum arc degasser at Sheffield Forgemasters International Ltd. The effect of different ladle design and process parameters are subsequently investigated. Raising the argon injection rate from 0.07 to 0.21 m^{3}min^{-1} is found to double the hydrogen degassing efficiency. The optimum efficiency is obtained for a porous plug placement at a radial distance of r/R=0.6, which is 24% more efficient than a central plug. A ladle aspect ratio of L/D=2 produces an increase in degassing efficiency of 32% compared to an aspect ratio of L/D=1.25, while the presence of a 10mm slag layer is shown to reduce efficiency by 26% in comparison to a slag free melt.

Original language | English |
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Title of host publication | AISTech 2017 - Proceedings of the Iron and Steel Technology Conference |

Pages | 1479-1490 |

Number of pages | 12 |

ISBN (Electronic) | 9781935117643 |

Publication status | Published - 1 Jan 2017 |

Event | AISTech 2017 Iron and Steel Technology Conference - Nashville, United States Duration: 8 May 2017 → 11 May 2017 |

### Publication series

Name | AISTech - Iron and Steel Technology Conference Proceedings |
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Volume | 2 |

ISSN (Print) | 1551-6997 |

### Conference

Conference | AISTech 2017 Iron and Steel Technology Conference |
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Country | United States |

City | Nashville |

Period | 8/05/17 → 11/05/17 |

### Keywords

- degassing
- hydrogen
- modelling
- population balance
- slag

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## Cite this

*AISTech 2017 - Proceedings of the Iron and Steel Technology Conference*(pp. 1479-1490). (AISTech - Iron and Steel Technology Conference Proceedings; Vol. 2).