宝钢转炉溅渣炉衬蚀损的研究

Study on the corrosion of BOF lining bricks in Bao-Steel under slag splashing process

借助SEM -EDAX和XRD手段研究了溅渣护炉作业条件下MgO -C砖的蚀损。熔蚀 -反应带基本上是终渣的组成 ,其中主相为RO(脱溶 )、C2 S、C2 F、CaO和Fe。脱碳层为疏松、多孔结构 ,可以观察到方镁石晶体的台阶生长和形成二次方镁石纤维这些与还原 -氧化气相反应相关的现象。但并不存在所谓的“MgO致密层”。

The corrosion mechanism of MgO-C lining brick of BOF under slag splashing process has been investigated by means of SEM,EDAX and XRD. The compositions of the hot-face zone, slag reaction layer are mainly the same as that of the end slag. The main phases are RO-phase(exsolution), P-C 2S ,C 2F,CaO and iron globules. The decarbonized zone is porous. In this layer, the stepgrowth on the surface of periclase and the fascicular fibers of secondary periclase can be observed under SEM. These phenomena are in close relationship with oxidation-reduction reaction of MgO+C= Mg↑+CO↑. The so called “dense MgO layer” between corrosion zone and decarbonized zone couldn't be observed.