Title

ULTRA-LOW PHOSPHORUS STEEL GRADE PRODUCTION IN ONE BATCH BOF BOTTOM BLOWING PROCESS

ULTRA-LOW PHOSPHORUS STEEL GRADE PRODUCTION IN ONE BATCH BOF BOTTOM BLOWING PROCESS

Authorship

Henrique Silva Furtado; Tathagata Bhattacharya; Hoyong Hwang; Odair Jose Kirmse

Henrique Silva Furtado

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Tathagata Bhattacharya

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Hoyong Hwang

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Odair Jose Kirmse

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DOI

10.5151/1982-9345-24297

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Abstract

Concerning production of low phosphorus steel critical grades at ArcelorMittal Tubarão site, bottom blowing system plays a very important role. For those systems with independently controlled tuyeres, some non-uniform bottom blowing patterns seem to be promising in improving metal-slag mixing; however, based on computational fluid dynamics (CFD) results of ArcelorMittal Tubarão’s post oxygen bottom blowing, this may not be generalized. Also, from industrial trials it became clear that higher the bottom blowing flow rate, the closer were the end point P to the equilibrium. Despite this result an analysis of the apparent mass transfer coefficient has shown a week correlation with the classical power stir correlation suggesting a more complex kinetic limiting step for phosphorus removal.

Concerning production of low phosphorus steel critical grades at ArcelorMittal Tubarão site, bottom blowing system plays a very important role. For those systems with independently controlled tuyeres, some non-uniform bottom blowing patterns seem to be promising in improving metal-slag mixing; however, based on computational fluid dynamics (CFD) results of ArcelorMittal Tubarão’s post oxygen bottom blowing, this may not be generalized. Also, from industrial trials it became clear that higher the bottom blowing flow rate, the closer were the end point P to the equilibrium. Despite this result an analysis of the apparent mass transfer coefficient has shown a week correlation with the classical power stir correlation suggesting a more complex kinetic limiting step for phosphorus removal.

Keywords

Dephosphorization; BOF process; Bottom blowing; CFD; Mixing

Dephosphorization; BOF process; Bottom blowing; CFD; Mixing