镁铁铝复合尖晶石砖抗水泥熟料和抗碱盐侵蚀性能研究  

Corrosion resistances of magnesia-ferric oxide-alumina composite spinel bricks to cement clinker and alkali salt

作　　者：李燕京[1,2] 孙加林[2] 李勇[2] 张军杰 刘梦 马淑龙 林鑫[2] 

机构地区：[1]通达耐火技术股份有限公司,北京100085 [2]北京科技大学材料科学与工程学院,北京100083 [3]北京三环新材料高技术公司,北京100190

出　　处：《耐火材料》2015年第1期20-26,共7页Refractories

摘　　要：为分析水泥窑用镁铁铝复合尖晶石砖的侵蚀机制,对经高温烧成的商品高铁镁砂-镁铝尖晶石砖、方镁石-铁铝尖晶石砖和镁铝尖晶石砖分别进行了1 450℃4 h的抗碱盐和抗水泥熟料侵蚀试验,并对侵蚀后试样进行了SEM扫描电镜和EDS物相分析。结果表明:高铁镁砂-镁铝尖晶石砖的抗碱盐侵蚀性和抗水泥熟料侵蚀性均最好,方镁石-铁铝尖晶石砖次之,镁铝尖晶石砖相对较差。这是因为高铁镁砂-镁铝尖晶石砖结构最为致密,体系中Fe元素以固溶体的形式存在,高温烧成时结构稳定,没有像方镁石-铁铝尖晶石砖中二次尖晶石的形成和Fe元素的变价带来的微裂纹,没有Fe元素的扩散造成的孔洞,使得碱蒸气不易渗入;体系中的Fe元素与水泥熟料反应生成高黏度的铁酸钙和铁酸铝相,阻止了水泥熟料的进一步渗透。The corrosion resistances of high iron magnesia-spinel brick,periclase-hercynite brick and mag-nesium aluminate spinel brick to alkali salt and cement clinker at 1 450 ℃ for 4 h were tested,and the corroded bricks were analyzed by SEMand EDS in order to research the corrosion mechanism of magnesia-ferric oxide-alumina composite spinel bricks for cement kilns.The results show that the high iron magnesia-spinel brick has the best corrosion resistances to alkali salt and cement clinker,periclase-hercynite brick follows,magnesia-alumina spinel brick performs the worst.For high iron magnesia-spinel brick,its struc-ture is the most compact,Fe element exists in the form of solid solution,at high temperatures,the structure is stable,and there is no microcrack caused by the formation of secondary spinel and the valence change of Fe element which happens in periclase-hercynite brick,there is no cavity caused by the spread of Fe element for the infiltration of alkali vapor;Fe element can react with cement clinker to produce the high viscosity phases such as calcium ferrite and aluminum ferrite,which prevent further infiltration of the cement clinker.

关 键 词：高铁镁砂-镁铝尖晶石砖 方镁石-铁铝尖晶石砖 镁铝尖晶石砖 水泥熟料 碱盐 抗侵蚀性 

分 类 号：TQ175.75[化学工程—硅酸盐工业]