结晶器保护渣原渣形貌及连铸结团样矿相组织分析  

Analysis of the original slag morphology of mold protective slag and agglomerated mineral phase structure during continuous casting process

作　　者：盖一铭 徐龙云 张同生 杨健 GAI Yiming;XU Longyun;ZHANG tongsheng;YANG jian(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Wide and Heavy Plate Plant of Hunan Valin Xiangtan Iron and Steel Co.,Ltd.,Xiangtan 411200,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]湖南华菱湘潭钢铁有限公司宽厚板厂,湖南湘潭411200

出　　处：《炼钢》2024年第6期62-68,82,共8页Steelmaking

基　　金：2022年度湖南省人力资源培养开发项目(专业技术类)(湘财社指[2022]24号)。

摘　　要：利用扫描电镜和X射线衍射等测试手段对湖南华菱湘潭钢铁有限公司3种保护渣熔融冷却原渣及其连铸过程中结块的矿物组成、结晶率进行了分析研究。结果表明,三种保护渣试样球型度较高,表面光滑。保护渣A主要析晶矿相为枪晶石、霞石、硅灰石;保护渣B主要析晶矿相为枪晶石、硅灰石、铁钠钾硅石;保护渣C主要析晶矿相为枪晶石。烧结相的大量黏结是渣条、结块形成长大的主要原因。为减少结团样出现的可能性,应降低保护渣中Al_(2)O_(3)含量成分,适当提高保护渣中的碳含量,使保护渣在连铸过程中具有良好析出枪晶石的能力。这样可以均匀和稳定铸坯与结晶器的之间的传热,从而降低渣条发黏导致液渣层动态平衡被破坏可能性,以减少保护渣结块的出现。The SEM and XRD were used to analyze the mineral compositions and crystallization ratio of the original mold flux after melting and cooling down and its agglomerates during continuous casting process in Xiangtan Iron and Steel Group Co.,Ltd..The results indicate that the three types of mold flux samples have high sphericity and smooth surfaces.The main crystalline phases of mold flux A are cuspidine,nepheline,and wollastonite.Those of mold flux B are cuspidine,wollastonite,and iron sodium potassium silicate.Those of mold flux C is cuspidine.The formation and growth of mold slag bars and agglomerates is due to the large amount of bonding in the sintered phase.In order to reduce the possibility of agglomerates,the Al_(2)O_(3) content in the mold flux should be reduced,and the carbon content should be appropriately increased,so that the mold flux are capable of precipitating cuspidine well during the continuous casting process.Therefore,the heat transfer between the casting slab and mold becomes uniform and stable,thereby reducing the possibility of the destruction of dynamic equilibrium of the liquid slag layer due to slag bar sticking.The occurrence of mold slag agglomeration can be reduced.

关 键 词：特厚板 渣条 结晶矿相 保护渣 

分 类 号：TF777[冶金工程—钢铁冶金]