Abstract: Based on CaO-SiO₂-Al₂O₃ -MgO-Na₂O-CaF₂ slag system with 0.85 basicity, the effect of rotating velocity of TiO₂ bar (50-120 r/min) , basicity (0.7 ~ 1.15) , flux temperature (1300 ~ 1480 °C ) , TiO₂ (0 〜12% ) and CaF₂ (5% 〜15% ) content on TiO₂ absorbed rate by mold flux has been studied by rotating kinetics method. Results show that respectively with increasing temperature and basicity, decreasing TiO₂ content and increasing CaF₂ content in flux, the TiO₂ dissolution rate in flux increases, in which the effect of temperature and basicity is most notable. Diffusion process is an inhibited links for TiO₂ dissolution and activation energy of dissolution process is 130.9 kJ/mol.

Key words: Mold Flux, TiO₂ Inclusion, Kinetics, Absorption

摘要： 碱度0.85、CaO-SiO₂-Al₂O₃-MgO-Na₂O-CaF₂为基本渣系,采用旋转动力学方法研究了TiO₂棒的旋转角速度(50～120)r/min,碱度(0.7～1.15),熔渣温度(1300～1480℃),TiO₂(0～12%),CaF₂(5%～15%)对保护渣吸收TiO₂速率的影响。结果表明,分别随温度升高,碱度增加,TiO₂含量降低和CaF₂含量增加,使TiO₂在渣中的溶解速率升高,其中温度和碱度的影响最显著。TiO₂溶解的限制性环节是扩散过程,溶解过程的活化能为130.9kJ/mol。

关键词: 保护渣, TiO₂夹杂物, 动力学, 吸收