【摘要】 以粒度均为5～3、3～1、≤1mm的电熔镁砂和低钙电熔镁钙砂(w(CaO)≈20%)或高钙烧结镁钙砂(w(CaO)≈50%)为骨料,鳞片石墨、电熔镁砂粉为基质,保持骨料与基质的质量比为7:3,采用加入量为30%、40%、55%、70%的低钙电熔镁钙砂或高钙烧结镁钙砂分别取代电熔镁砂骨料制备CaO含量不同的MgO-CaO-C砖,利用回转抗渣法对比了这两种砖抗CaO-SiO2渣的侵蚀性能,并对残砖进行了SEM分析。结果表明:随着两种镁钙砂含量的增加,低钙电熔料制备的MgO-CaO-C砖抗渣侵蚀性能及挂渣性能均逐渐增强,而高钙烧结料制备的MgO-CaO-C砖抗渣侵蚀性能却降低;在镁钙砂加入量相同的情况下,低钙电熔料制备的MgO-CaO-C砖抗渣侵蚀性能及挂渣性能均远远好于高钙烧结料制备的MgO-CaO-C砖;MgO-CaO-C砖在CaO-SiO2渣中的蚀损主要是MgO在渣中的溶解,其溶解速度取决于镁砂及镁钙砂的致密度,MgO的晶粒粒径,镁钙砂中CaO的分布;只有当镁钙砂的致密度较高时,其抗CaO-SiO2渣侵蚀的优势才能体现出来。更多还原

【Abstract】 Two different MgO-CaO-C bricks with different CaO content were prepared with fused magnesia and fused doloma(w(CaO)≈20%)or sintered doloma(w(CaO)≈50%)as aggregate(grain size:5-3,3-1,≤1 mm),flake graphite and fused magnesia powder as matrix.Based on fixed mass ratio of aggregate to matrix of 7:3,fused magnesia aggregate was partially substituted by fused doloma or sintered doloma with additions of 30%,40%,55%,70%,respectively.Corrosion resistance to CaO-SiO2 slag of the two different MgO-CaO-C bricks was compared by rotary corrosion test.Residual specimens were analyzed by SEM.The results show that with the increase of CaO content,slag corrosion resistance of MgO-CaO-C brick with fused doloma is enhanced,however,slag corrosion resistance of MgO-CaO-C brick with sintered doloma decreases.With the same addition of doloma,slag corrosion resistance and slag adhesion of MgO-CaO-C bricks with fused doloma are far better than those with sintered doloma.The corrosion damage of MgO-CaO-C brick in CaO-SiO2 slag is mainly the dissolution of MgO.Dissolution rate lies on density of magnesia and doloma,grain size of MgO and CaO distribution in doloma.Only the density of doloma is high enough,can the advantage of corrosion resistance to CaO-SiO2 slag of MgO-CaO-C brick be exerted.更多还原