氧化镧对水泥窰用方镁石-复合尖晶石砖结构与性能的影响  

Effects of Lanthana on Structures and Properties of Periclase-compound Spinel Brick for Burning Zone of Cement Rotary Kiln

作　　者：李国华[1] 陈树江[1] 田琳[1] 郝明选 袁林[2] 

机构地区：[1]辽宁科技大学高温材料与镁资源学院,辽宁鞍山114051 [2]中国建筑材料科学研究总院,北京100024

出　　处：《中国稀土学报》2015年第1期106-110,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家"十二五"科技支撑计划资助项目(2013BAE03B00)

摘　　要：为了研究水泥窑无铬化和在使用替代燃料等新环境下水泥熟料对砖的侵蚀机制,本实验以高纯镁砂、铁铝尖晶石、高铁镁砂为原料制备出了方镁石-复合尖晶石砖,研究了氧化镧对复合尖晶石砖结构与性能的影响。随着氧化镧含量增加,试样的体积密度、耐压强度、抗折强度、粘结强度、荷重软化温度、高温抗折强度均增加;氧化镧与Si O2反应生成硅酸镧,硅酸镧为高熔点矿物相,使材料由硅酸盐结合转变为由硅酸镧直接结合,增加了材料的抗侵蚀性和抗渗透性;水泥熟料中的主要矿物相为C2S,加入氧化镧能稳定水泥熟料中的C2S,防止窑皮的脱落,提高了耐火材料的挂窑皮性。In order to clarify the corrosion mechanism periclase-compound spinel brick was prepared based on The influence of lanthana content on the structure and of chrome free brick under ahemative fuels environment, high purity magnesite, hercynite and ferrginous mangesite. performance of spinel brick was also studied. The results showed that bulk density, crushing strength, bending strength, bonding strength, refractoriness under load and hot modulus of rupture increased with lanthana. Lanthana reacted with silica to produce lanthanum silicate, which had high melting point, the bonding between the magnesia and low melt silicates was replaced by the bonding between the magnesia and high melt silicates containing rare earth in the matrix of brick. Due to the improvement of micro- structure of brick, corrosion resistance and infiltration resistance were improved greatly. The main mineral phases in cement clinker was C：S, and adding lanthana could stabilize the β-C2S in cement clinker, preventing the spal- ling of coating, improving the coating adherence

关 键 词：方镁石-复合尖晶石砖 氧化镧 抗侵蚀性 挂窑皮性 

分 类 号：TQ175.71[化学工程—硅酸盐工业]