Slag formation path during dephosphorization process in a converter

Jiang Diao, Yong Qiao, Xuan Liu, Xie Zhang, Xin Qiu, Bing Xie

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    Jiang Diao, Yong Qiao, Xuan Liu, Xie Zhang, Xin Qiu, and Bing Xie, Slag formation path during dephosphorization process in a converter, Int. J. Miner. Metall. Mater., 22(2015), No. 12, pp.1260-1265. https://dx.doi.org/10.1007/s12613-015-1193-9
    Jiang Diao, Yong Qiao, Xuan Liu, Xie Zhang, Xin Qiu, and Bing Xie, Slag formation path during dephosphorization process in a converter, Int. J. Miner. Metall. Mater., 22(2015), No. 12, pp.1260-1265. https://dx.doi.org/10.1007/s12613-015-1193-9
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    Slag formation path during dephosphorization process in a converter

    • College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    基金项目: 

    This work was partially supported by the Fundamental Research Funds for the Central Universities (No. CDJZR 14130001).

      通信作者:

      Jiang Diao E-mail: diaojiang@163.com

    中文摘要

    The slag formation path is important for efficient dephosphorization in steelmaking processes. The phosphorus capacity and the melting properties of the slag are critical parameters for optimizing the slag formation path. Regarding these two factors, the phosphorus partition ratio was calculated using the regular solution model (RSM), whereas the liquidus diagrams of the slag systems were estimated using the FactSage thermodynamic package. A slag formation path that satisfies the different requirements of dephosphorization at different stages of dephosphorization in a converter was thus established through a combination of these two aspects. The composition of the initial slag was considered to be approximately 15wt%CaO–44wt%SiO2–41wt%FeO. During the dephosphorization process, a slag formation path that follows a high-iron route would facilitate efficient dephosphorization. The composition of the final dephosphorization slag should be approximately 53wt%CaO–25.5wt%SiO2–21.5wt%FeO. The composition of the final solid slag after dephosphorization is approximately 63.6wt%CaO–30.3wt%SiO2–6.1wt%FeO.

     

    Slag formation path during dephosphorization process in a converter

    Author Affilications

      • College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    • Funds: 

      This work was partially supported by the Fundamental Research Funds for the Central Universities (No. CDJZR 14130001).

    • Received: 07 October 2014; Revised: 04 December 2014; Accepted: 20 December 2014;
    The slag formation path is important for efficient dephosphorization in steelmaking processes. The phosphorus capacity and the melting properties of the slag are critical parameters for optimizing the slag formation path. Regarding these two factors, the phosphorus partition ratio was calculated using the regular solution model (RSM), whereas the liquidus diagrams of the slag systems were estimated using the FactSage thermodynamic package. A slag formation path that satisfies the different requirements of dephosphorization at different stages of dephosphorization in a converter was thus established through a combination of these two aspects. The composition of the initial slag was considered to be approximately 15wt%CaO–44wt%SiO2–41wt%FeO. During the dephosphorization process, a slag formation path that follows a high-iron route would facilitate efficient dephosphorization. The composition of the final dephosphorization slag should be approximately 53wt%CaO–25.5wt%SiO2–21.5wt%FeO. The composition of the final solid slag after dephosphorization is approximately 63.6wt%CaO–30.3wt%SiO2–6.1wt%FeO.

     

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