MgO含量对CaO－SiO_2－Al_2O_3－MgO熔渣中液态相影响的模拟

Simulation on influence of MgO content on liquid phase in CaO-SiO_2-Al_2O_3-MgO slag

运用Factsage软件模拟了MgO含量对CaO-SiO2-Al2O3-MgO熔渣中液相区的影响.结果表明,随着CaO-SiO2-Al2O3-MgO渣中MgO含量增加,渣中低熔点液相区整体向低CaO高SiO2区移动.相图中1500℃液相区比例由0%MgO(质量分数)时的25.05%上升至9%MgO(质量分数)时的52.69%,而后降至15%MgO时的46.70%.相图中1400℃液相区比例由3%MgO时的14.41%上升至11%MgO时的34.39%,而后降至15%MgO时的31.04%.相图中1300℃液相区比例由5%MgO时的5.57%上升至14%MgO时的11.02%,而后降至15%MgO时的10.50%.相图中1200℃液相区域比例在MgO为0~6%时为零,由7%MgO时的0.88%上升至11%MgO时的1.22%,在MgO为13%~15%时降为零.模拟结果可对以CaO-SiO2-Al2O3-MgO为基本组元配置炼钢渣系的成分选择提供有效指导.

The influence of MgO content on liquid phase in CaO-SiO2-Al2O3-MgO slag system was simulated by Factsage software.The results show that,with increase of MgO content in CaO-SiO2-Al2O3-MgO slag,the low melting point liquid area moves forward‘low CaO high SiO2'area. 1500℃ liquid area ratio of phase diagram rises from 25. 05% of 0% MgO( mass fraction) to 52. 69% of9% MgO,and drops to 46. 70% of 15% MgO. 1400 ℃ liquid area ratio of phase diagram rises from 14. 41% of 3% MgO to 34. 39%of 11% MgO,and drops to 31. 04% of 15% MgO. 1300 ℃ liquid area ratio of phase diagram rises from 5. 57% of 5% MgO to11. 02% of 14% MgO,and drops to 10. 05% of 15% MgO. 1200 ℃ liquid area ratio of phase diagram is 0 when MgO content during0 to 6%,and rises from 0. 88% of 7% MgO to 1. 22% of 11% MgO,then changes to 0 when MgO content during 13% to 15%.Simulation results provide an effective guidance for composition selection of steelmaking slag with the CaO-SiO2-Al2O3-MgO components as the basic configuration.