A Study of Refining Performance in a BOS Converter

09 Sep 2011

M.S. Millman; Tata Steel RD&T Teesside Technology Centre, United Kingdom
A. Overbosch, A Kapilashrami; Tata Steel RD&T IJmuiden, The Netherlands
D. Malmberg; Swerea MEFOS, Sweden
M. Brämming; SSAB Tunnplat AB, Sweden

A unique in-blow sampling system has been applied to a blowing converter to retrieve representative bulk metal bath and slag/metal emulsion samples simultaneously from seven specified positions and every two minutes from start of blow. Full sample data sets from twenty heats have been grouped according to differences in the bulk bath phosphorus removal profiles
and analysed with respect to relative refining ability of the slag/ metal emulsion and the bulk metal bath. The complexity of the thermo-kinetic relationships behind the removal of carbon and the transfer of silicon, phosphorus, manganese and sulphur between the metal and slag are highlighted and the metal circulation rate in the emulsion is derived.

Paper presented at EOSC 2011 - The 6th European Oxygen Steelmaking Conference, Stockholm, Sweden, September 7-9, 2011