Kinetic study on deep dephosphorization treatment of liquid steel by BaO-based fluxes

Zhihong Tian , Yanyong Guo), Kaike Cai, Liqun Ai, and Huien ShiMetallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China Metallurgical Department, Heibei Institute of Technology, Tangshan 063009, China

摘 要：<正>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.

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