电熔镁砂在CaO–Al_(2)O_(3)–SiO_(2)熔渣中的溶解行为

Dissolution Behavior of Fused Magnesia in CaO–Al_(2)O_(3)–SiO_(2)Slags

作为镁质耐火材料的重要原料,电熔镁砂在低密度高强钢精炼用CaO–Al_(2)O_(3)–SiO_(2)系熔渣中的溶解是影响炉衬使用寿命及钢质量的重要因素。本工作采用高温激光共聚焦显微观测系统研究了1600℃下镁砂在该熔渣中的溶解行为,探究了镁砂颗粒的形状、质量及熔渣CaO和SiO_(2)质量分数比(即C/S)对其溶解行为的影响。结果表明:镁砂主要形状对其溶解速率影响较小;溶解速率随质量增大呈近线性下降,随C/S的增加而先降低后增加;镁砂颗粒的溶解曲线受质量影响更大,其溶解模型n值分别对应1/2、2/3、3/5,这为深入理解镁质耐火材料的渣蚀行为和提质优化提供指导。

As an important raw material of magnesia based refractories,the dissolution of the fused magnesia in the CaO–Al_(2)O_(3)–SiO_(2)slags for refining a low density and high strength steel is an important factor affecting the service life of furnace lining and the quality of steel.In this paper,the dissolution behavior of fused magnesia in the slag at 1600℃was investigated by a high-temperature laser confocal microscopy system.The effects of the shape and mass of magnesia particles and the mass fraction ratio of CaO to SiO_(2)(C/S)on the dissolution behavior were investigated.The results show that the shape of fused magnesia particles has little effect on its dissolution rate.The dissolution rate decreases linearly with the increase of mass,and it decreases firstly and then increases with the increase of C/S ratio.The dissolution curve of magnesia particles is affected by the mass,and the n values of the dissolution model can correspond to 1/2,2/3 and 3/5,respectively.This work provides a guidance for understanding the slag corrosion behavior of magnesia based refractories,improving the quality and optimizing the performance of magnesia based refractories.