H_2C_2O_4和CO_2复合表面处理镁钙砂及其浇注料的性能  

Properties of MgO-CaO clinker with surface treatment by H_2C_2O_4 and CO_2 and its castable

作　　者：顾华志[1] 汪厚植[1] 洪彦若[2] 张文杰[1] 孙加林[2] 欧阳军华[3] 

机构地区：[1]武汉科技大学高温陶瓷与耐火材料湖北省重点实验室,武汉430081 [2]北京科技大学材料科学与工程学院 [3]钢铁研究总院

出　　处：《耐火材料》2005年第3期161-164,共4页Refractories

基　　金：湖北省教育厅资助项目(2003A007)。

摘　　要：首先采用H2C2O4溶液对镁钙砂进行表面浸渍,然后在CO2气氛下于450℃1h热处理而制得抗水化的镁钙砂,再以此镁钙砂和电熔镁砂为原料制成不同CaO质量分数(0、10%、20%、30%)的浇注料,并研究表面处理后镁钙砂的抗水化性,镁钙浇注料的抗水化性、物理性能、抗渣渗透性及其对钢水的脱磷和脱硫效果。结果表明,经H2C2O4和CO2处理后的镁钙砂,其表面形成了一层均匀的、在低温(低于600℃)下主要由CaC2O4和CaCO3构成的保护膜,使其抗水化效果优于用H3PO4或单独用CO2处理的。采用这种镁钙砂制成的镁钙浇注料具有良好的抗水化性能,其常规物理性能优于镁质浇注料和用未处理镁钙砂制的浇注料,抗渣渗透性能强于镁质浇注料的,脱磷、脱硫效果也较未处理镁钙浇注料的更显著。The hydration resistance of the MgO-CaO clinker was modified by impregnating with H2C2O4 solution and heat treatment at 450°C for 1 hour in CO2 atmosphere. The hydration resistance, slag penetration resistance, physical properties, dephosphorization and desulphuration of the castable with different contents of CaO(0, 10%, 20% and 30% ) by using the surface treated MgO-CaO clinker and fused magnesia were comparatively investigated. The results show that MgO-CaO clinker treated with H2C2O4 solution and CO2 possesses good hydration resistance due to the formation of uniform coating consisting of CaC2O4 and CaCO3 at temperature below 600°C. Compared with untreated MgO-CaO and MgO based castables, it is also found that the MgO-CaO castable prepared with the treated clinker has better hydration resistance, physical properties and slag resistance, and much better ability for desulphuration and dephosphorization.

关 键 词：镁钙砂 表面处理 CO2 镁质浇注料 复合 物理性能 脱硫效果 抗渣渗透性 CACO3 H3PO4 抗水化性能 质量分数 电熔镁砂 渗透性能 热处理 450 CaO 保护膜 600 制成 脱磷 浸渍 气氛 

分 类 号：TQ175.713[化学工程—硅酸盐工业] TG178[金属学及工艺—金属表面处理]