【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。更多还原

【Abstract】 The hydration resistance of the MgO-CaO clinker was modified by impregnating with H₂C₂O₄ solution and heat treatment at 450 ℃ 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 ℃.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.更多还原