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HomeDynamic on-line monitoring and end-point control of dephosphorisation in the BOF (BOFdePhos)
Final report
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The main objective of the BOFdePhos project was the investigation of relevant thermodynamic and kinetic aspects of the dephosphorisation reaction in the BOF process, such as the effect of slag composition and solid phases on phosphorus distribution, lime dissolution and the evolution of metal-slag emulsion as main reaction zone. It was found that BOF slags are heterogeneous during a large period of the blow and at the end of blow in most cases. The consideration of solid phases formation in the slag, especially the C2S_C3P phase which was found to dissolve phosphorus with certain kinetic limitations, is crucial for a successful modelling and control of dephosphorisation. An appropriate new approach for thermodynamic modelling of the P-distribution between a heterogeneous slag and liquid iron covering the total blowing period in converter was developed and incorporated in a kinetic dephosphorisation model. The kinetics have been derived taking into account metal droplet circulation rate and residence time in metal-slag emulsion. A newly developed TSO probe for application in slag provided additional information about BOF slag properties after end of blow. The findings regarding thermodynamics and kinetics of the dephosphorisation reaction in BOF have been implemented within appropriate submodels for dynamic online and offline process models in order to validate the newly developed approach at the BOF plants of Tata Steel in Port Talbot and IJmuiden. Finally, new strategies for the enhancement of dephosphorisation control in the BOF converter, focusing on using the potential of the solid C2S_C3P phase in removing phosphorus, were derived.
- Published:
- Corporate author(s): Directorate-General for Research and Innovation (European Commission)
- Personal author(s): Schlautmann, M ; Kleimt, B ; Peiss, V ; Schrama, F ; Barnes, C ; Glaser, B ; Hack, K ; Monheim, P ; Khadhraoui, S ; Uebber, N ; Odenthal, J ; Antonic, R ; Fischer, H
- Themes: Basic metals industry, steel industry , Industrial research and development
- Subject: applied research , innovation , iron and steel product , metal by-product , metalworking , research report , steel , technological process
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| ISSN 1831-9424 | ISBN 978-92-76-27838-2 | DOI 10.2777/151609 | Catalogue number KI-NA-30535-EN-N |
- Released on EU publications website:
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