转炉渣与镁质耐火材料的润湿机制  

Wetting Mechanism Between Molten Slag and MgO-C Refractories in Converter

作　　者：潘贻芳[1] 赵宏欣[1,2] 吴燕[3] 李树庆[1] 侯葵[1] 袁章福[3] 

机构地区：[1]天津钢铁集团有限公司技术中心,天津300301 [2]中国科学院过程工程研究所,北京100190 [3]北京大学工学院,北京100871

出　　处：《钢铁》2013年第5期35-40,共6页Iron and Steel

基　　金：国家自然科学基金资助项目(51174008;21106167);天津市重大科技攻关项目(07ZCKFGXD3800);博士后科学基金资助项目(2012M510552)

摘　　要：采用静滴法研究了2种情况下转炉渣与炉衬耐火材料的润湿性。当转炉渣与耐火材料直接接触时,转炉渣不熔化,当用刚玉坩埚将两者隔开时,界面处发生反应性润湿,动态接触角随温度升高而单调减小,铺展面积随时间成线性增加。渣中FeO含量由于镁碳砖基板表面的碳及中间产物CO的还原而降低,导致炉渣熔化性温度升高而未熔化。液态熔渣沿镁碳砖表面的气孔和裂纹向基体内扩散、渗透,渣中铁氧化物与镁碳砖机体内的MgO反应生成含高熔点相的黄色渗透层,起到保护炉衬的作用,从而解释了炉渣与耐火材料的粘附机制,为优化溅渣护炉工艺,合理调整炉渣成分和选择耐火材料等工艺操作提供理论依据。Wettability between molten slag and MgO-C refractories was investigated by sessile drop method at high temperatures.When the slag was contacted directly with the refractory,the slag stayed infusible.When the slag was separated by a small alumina crucible from the refractory,wettable reaction occurred.Contact angles of molten slag and MgO-C refractory in reactive wetting decreased monotonously with the increase of the temperature,while the area spreading rate linearly increased.FeO in the slag is reduced to Fe by the carbon in substrate or CO in the atmosphere,which results in the increase of the melting point（or softening temperature） of the slag.Molten slag penetrates pores and cracks on the surface of MgO-C refractory,then yellow permeability layer including high melting-point phase which protects the lining of converter is generated by the reaction of Fe2O3 in slag and MgO,which provides a theoretical basis for optimizing slag splashing process,controlling the slag composition and selecting refractory.

关 键 词：润湿 溅渣护炉 炉渣 耐火材料 

分 类 号：TF748.05[冶金工程—钢铁冶金]