Abstract: Based on ion-molecule coexistence theory, a thermodynamic model for calculation of sulphur partition ratio between 57CaO-10SiO₂ -8 MgO-25 Al₂O₃ quaternary slag series and liquid steel has been established by calculating the mass action concentration of ladle furnace (LF) refining slag structural units to get the sulphur partition ratio between slag-steel of this slag series L_s=1115 in end LF refining at 1 630 ℃. The measure results of 9 heats 210 t double bottom nozzle argon blowing LF refining slag samples show that to subtract the existing definite system deviation due to restriction on conditions including worksite and oxygen level of slag series, the model is available to reflect the LF refining slag sulphur partition ratio in commercial steelmaking production.

摘要： 基于离子与分子共存理论,通过计算钢包炉（LF）精炼渣结构单元的质量作用浓度,建立了一种计算57CaO-10SiO₂-8MgO-25Al₂O₃四元渣系与钢液硫分配比的热力学模型,计算得出1630℃LF精炼结束时,该渣系的渣-钢间的硫分配比L_S=1115。通过9炉210 t双孔底吹氩LF渣样检测结果表明,当减去因现场和渣系的氧势等条件限制,所存在的定值系统偏差,该模型可有效反映工业生产的LF精炼渣硫分配比。

关键词: 钢包炉, 精炼渣, 热力学模型, 硫分配比