Title

ON-LINE PHOSPHOROUS MEASUREMENT IN BASIC OXYGEN STEELMAKING

ON-LINE PHOSPHOROUS MEASUREMENT IN BASIC OXYGEN STEELMAKING

Authorship

Vortrefflich, Walter; Engel, Edo; Staudinger, Günther

Vortrefflich, Walter

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Engel, Edo

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Staudinger, Günther

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DOI

10.5151/2594-5300-23356

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Abstract

Controlling Phosphorous levels during the steelmaking process has always been difficult. With the increased use of iron ores containing high Phosphorous, the measurement of Phosphorous at end point in BOF steelmaking continues to be a subject of interest because of the impact of Phosphorous on steel quality. BOF slag is complex in nature and contains several oxides like CaO, SiO2, P2O5, MgO, MnO, and FeO etc. Towards the end of blow the kinetics of different reactions slows down such that slag composition approaches a kind of pseudo equilibrium with metal. Thus, application of (thermo-dynamical) models alone for direct estimation of Phosphorous distribution does not yield sufficient reliable information for start tapping decision. This memo describes a new measurement technology that was developed by DC for its sublance customers. The Phosphorous measurement is based on the TSO end of blow measurement, but was further enhanced over a four year development period. As final step in the technology development, a new user friendly graphical representation was created that facilitates the decision making of the converter operator at the end of heat. This technology development was carried out in several steel plants that were in normal operation.

Controlling Phosphorous levels during the steelmaking process has always been difficult. With the increased use of iron ores containing high Phosphorous, the measurement of Phosphorous at end point in BOF steelmaking continues to be a subject of interest because of the impact of Phosphorous on steel quality. BOF slag is complex in nature and contains several oxides like CaO, SiO2, P2O5, MgO, MnO, and FeO etc. Towards the end of blow the kinetics of different reactions slows down such that slag composition approaches a kind of pseudo equilibrium with metal. Thus, application of (thermo-dynamical) models alone for direct estimation of Phosphorous distribution does not yield sufficient reliable information for start tapping decision. This memo describes a new measurement technology that was developed by DC for its sublance customers. The Phosphorous measurement is based on the TSO end of blow measurement, but was further enhanced over a four year development period. As final step in the technology development, a new user friendly graphical representation was created that facilitates the decision making of the converter operator at the end of heat. This technology development was carried out in several steel plants that were in normal operation.

Keywords

Phosphorous; Converter; Measurement; Sublance.

Phosphorous; Converter; Measurement; Sublance.