精炼钢包用MgO-CaO浇注料的抗渣性研究  

Slag Resistance of MgO-CaO Castables for Ladle

作　　者：夏熠[1] 周宁生[2] 张三华[1] 

机构地区：[1]中钢集团洛阳耐火材料研究院研发中心,河南洛阳471039 [2]河南科技大学高温材料研究院,河南洛阳471003

出　　处：《中国冶金》2006年第2期30-32,51,共4页China Metallurgy

摘　　要：采用动态回转法研究了MgO-SiO2-H2O结合和聚磷酸盐结合的MgO-CaO浇注料的抗渣性,以MgO-CaO砂和CaCO3作CaO源,比较了CaO的引入方式对其抗渣性的影响。利用X射线衍射分析测定了各类浇注料在1 600℃烧后的相组成,借助SEM和EDAX分析了MgO-CaO浇注料经渣蚀后的显微结构。研究表明,MgO-CaO浇注料中的CaO在高温烧成时参与了基质相的反应,CaCO3细粉的引入加大了CaO在基质中参与反应的程度。聚磷酸钠结合的MgO-CaO浇注料在高温烧成时生成高熔点的结合相硅磷钙钠(NC4PS),有助于提高抗渣能力。MgO-SiO2-H2O结合浇注料中的低熔点相钙镁橄榄石和镁蔷薇辉石(CMS、C3MS2)随CaCO3的引入而增多,对抗渣性不利。The slag resistance of M-S-H gel bonded and sodium polyphosphate bonded MgO-CaO castables was studied by crucible method and rotary slag test. The influence of introducing CaO from MgO-CaO clinker and CaCO3 powder on slag resistance was compared. Microstructure analysis by SEM and EDAX was conducted to interpret corrosion behavior. Tests show that at high temperature, the CaO from MgO-CaO clinker takes part in the reactions in the matrix to form bonding phases, in the case of adding CaCO3, more CaO is involved in the reactions. Na polyphosphate bonded castables form sodium calcium phosphate silicate phase in the matrix, helpful to slag resistance. The amount of monticellite and merwinite in the matrix of M-S-H gel bonded MgO-CaO castables increases with CaCO3, which is disadvantageous to slag resistance.

关 键 词：浇注料 MgO-CaO系 结合方式 抗渣性 

分 类 号：TF769.2[冶金工程—钢铁冶金]