转炉生产低碳低磷钢炉衬侵蚀机理研究  

A study on erosion mechanism of steel furnace lining in converter producing low carbon and low phosphorus

作　　者：吕长海 李晶 吴国平 闫威 闫晨 戴雨翔 LV Changhai;LI Jing;WU Guoping;YAN Wei;YAN Chen;DAI Yuxiang(State Key Laboratory of Advanced Metallurgy Technology,University of Science and Technology Beijing,Beijing 100083,China;Nanjing Iron and Steel Co.,Ltd.,Nanjing 210035,China)

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [2]南京钢铁股份有限公司,南京210035

出　　处：《江西冶金》2019年第6期1-8,共8页Jiangxi Metallurgy

基　　金：国家自然科学基金资助项目(51904022)

摘　　要：通过现场取炉衬溅渣层及镁碳砖样品研究炉衬侵蚀机理,利用SEM扫描电镜、高倍显微镜、X射线荧光光谱分析仪、Factsage软件,从微观和宏观两方面详细地分析了炉衬的侵蚀过程.在实际生产过程中,炉衬的侵蚀原因有很多种,主要研究了三方面内容,分别为溅渣层的熔损、镁碳砖中碳的氧化及镁砂颗粒的溶解与迁移.溅渣层的熔损主要与炉渣中(FeO)含量有较大关系,降低炉渣中(FeO)含量能提高溅渣层中物相的分解温度,从而起到减缓炉衬侵蚀、保护炉衬作用.镁碳砖中碳与溅渣层中(FeO)发生反应生成气体而损失,之后高氧化性炉渣侵入到镁碳砖中镁砂颗粒周围,形成包裹发生部分溶解,伴随着炉渣的逐步侵入,镁砂颗粒随着炉渣中(MgO)的饱和溶解度的变化,发生不断溶解和被动迁移.通过研究的炉衬侵蚀机理来看,造成炉衬侵蚀的主要原因与生产钢种的炉渣有较大关系.The erosion mechanism of furnace lining was studied by the analysis of the furnace lining slag layer and magnesia carbon brick samples. The erosion process of the lining was analyzed from the perspective of micro and macro level by the utilization of the SEM scanning electron microscope, high power microscope, Xray fluorescence spectrum analyzer and Factsage software. In the practice of production process, there are many reasons concluded for the erosion of the lining. Three aspects were mainly studied in this paper, namely the erosion of the slag splashing layer, the oxidation of carbon in the magnesia carbon brick and the dissolution and migration of the magnesia granule. It shows that the erosion of the slag splashing layer was mainly related to the content of(FeO) in the slag. By reducing the(FeO) content in the slag can increase the decomposition temperature of the phase in the slag splashing layer, reducing the lining erosion and protecting the lining.Given the gas was produced by the chemical reaction between the carbon in the magnesia carbon brick and(FeO) in the slag splashing layer, the loss of slag splashing layer was caused. Then, the high oxidization slag was formed around the magnesia granules in the magnesia carbon bricks. Therefore, the granules were partly dissolved. With the accumulation of the slag, the magnesia granules continued to be dissolved and migrated passively as the saturated solubility of the slag(MgO) changes. Based on the lining erosion mechanism studied in this paper, the main cause of lining erosion was highly related to the slag in steel production.

关 键 词：炉衬寿命 侵蚀机理 溅渣层熔损 碳氧化 镁砂被动迁移 高氧化性炉渣 

分 类 号：TG142[一般工业技术—材料科学与工程]