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Laboratory study was carried out on deep dephosphorization of liquid steel by BaO-based fluxes at 1600℃ to achieve ultra low phosphorus level in the steel. A dynamic model of dephosphorization of liquid steel by BaO-based fluxes was established. According to the model, the controlling step of dephosphorization by BaO-based fluxes was the mass-transfer of phosphorus in steel phase under the condition of low phosphorus liquid steel. It is estimated that the apparent rate constant of dephosphorization by BaO-based fluxes was 0.4×10-3-8.2×10-3 g/(cm2·s) and the mass-transfer coefficient of phosphorus in bulk steel was 0.025-0.04 cm/s.
Laboratory study was carried out on deep dephosphorization of liquid steel by BaO-based fluxes at 1600 ° C to achieve ultra low phosphorus level in the steel. A dynamic model of dephosphorization of liquid steel by BaO-based fluxes was established. According to the model, the controlling step of dephosphorization by BaO-based fluxes was the mass-transfer of phosphorus in steel phase under the condition of low phosphorus liquid steel. It is estimated that the apparent rate constant of dephosphorization by BaO-based fluxes was 0.4 × 10 -3 -8.2 × 10 -3 g / (cm 2 · s) and the mass-transfer coefficient of phosphorus in bulk steel was 0.025-0.04 cm / s.