摘要
以镁质坩埚为试验容器,配制碱度分别为1.2、1.5、1.7、1.9、2.2、2.4的改性钢渣并放置于坩埚中,以10℃.min-1的速率升温至1 570℃并保温30 min加热熔化。研究了热态改性钢渣对镁质坩埚的侵蚀,并采用光学显微镜、SEM、EDS和XRD进一步分析了侵蚀行为。分析表明:改性钢渣对镁质耐火材料的侵蚀反应主要在熔渣-坩埚界面处进行,熔渣碱度≤1.5时耐火材料侵蚀加重;由于钢渣中铁离子渗透进方镁石晶体内,形成弥散分布的颗粒状富FeO固溶体和含FeO方镁石基质相,这两种物相受内部FeO、MgO质量比和钢渣中Al2O3含量的影响,选择性地同渣中不同化学组分进行反应而脱落溶解至钢渣中。
Six kinds of modified BOF slag with varied basicities ( 1.2,1.5,1.7,1.9,2.2,2.4, respectively) were prepared,put in six separate magnesia crucibles, heated to 1 570 ℃at 10 ℃·min-1 holding for 30 min. The corrosion of the hot modified slags to the magnesia crucible was analyzed with optical micro- scope,SEM,EDS and XRD. Analysis shows that the corrosion reaction of magnesia crucible by the modi- fied slags mainly occurs in the slag-crucible interface,and when the basicity of liquid slag is ≤1.5 the cor- rosion of crucible gets severe;Fe ions in liquid slag penetrate into the periclase crystals forming the dis- persed granular FeO-rich solid solution and FeO-containing periclase matrix phase,and they selectively re- act with different components of liquid slag and dissolve in the slag affected by their mass ratio of FeO to MgO and the AI203 content in liquid slag.
出处
《耐火材料》
CAS
北大核心
2013年第2期81-87,共7页
Refractories
基金
国家自然科学基金重点项目(51034008)
"十二五"国家科技支撑计划重大项目(2011BAC06B10)资助项目
关键词
转炉钢渣
热态改性
镁质耐火材料
侵蚀行为
BOF slag
hot modification
magnesia refractories
corrosion behavior