水泥回转窑过渡带用尖晶石-方镁石-铝酸钙耐火材料的制备  

Preparation of Spinel-Periclase-Calcium Aluminate Refractory Used in Transitional Zone of Cement Rotary Kiln

作　　者：左斌 尹洪峰[1] 刘云 辛亚楼 刘宇驰 袁蝴蝶[1] ZUO Bin;YIN Hongfeng;LIU Yun;XIN Yalou;LIU Yuchi;YUAN Hudie(College of Materials Science and Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055

出　　处：《材料导报》2024年第12期68-72,共5页Materials Reports

基　　金：国家自然科学基金(51572213)。

摘　　要：水泥回转窑过渡带由于难以结窑皮和所用耐火材料热导率较高,使得窑体表面温度高,散热损失大。本工作以菱镁矿、白云石和煅烧氧化铝为原料合成了尖晶石-铝酸钙复相轻量骨料,以此为颗粒,以烧结镁砂细粉为基质制备出尖晶石-方镁石-铝酸钙耐火材料。借助扫描电子显微镜、X射线衍射仪等手段研究了合成原料物相组成对耐火材料常温物理性能、荷重软化温度和抗水泥物料侵蚀性能的影响,结果表明:利用菱镁矿、白云石和煅烧氧化铝为原料在1650℃保温4 h可以合成吸水率较低的尖晶石-铝酸钙复相轻量耐火原料。以合成尖晶石-铝酸钙复相材料为骨料可以制备出常温耐压强度较高的尖晶石-方镁石-铝酸钙耐火材料,其高强度得益于合成骨料与方镁石基质的良好结合。尖晶石-方镁石-铝酸钙耐火材料具有较好的抗水泥物料侵蚀性能,可用于水泥回转窑过渡带。The transitional zone of cement rotary kiln has a high surface temperature and large heat dissipation loss due to the difficulty to form the kiln skin and the high thermal conductivity of the refractory used.In this work,spinel-calcium aluminate multiphase lightweight aggregates were synthesized from magnesite,dolomite and industrial alumina,and spinel-periclase-calcium aluminate refractories were fabricated by using synthesized materials as aggregate and sintered magnesia fine powder as the matrix.With the help of scanning electron microscope,X-ray diffractometer and other means,the effects of phase composition of synthetic raw materials on their physical properties at room temperature,refractoriness under load and corrosion resistance of cement materials were investigated.The results show that spinel-aluminate mulitiphase lightweight refractory materials with low water absorption can be synthesized by using magnesite,dolomite and alumina as raw materials fired at 1650℃for 4 h.The synthetic spinel-calcium aluminate multiphase material can be used as aggregate to prepare spinel-periclase-calcium aluminate refractory with higher compressive strength at room temperature due to thier good combination between synthetic aggregate and magnesia matrix.Spinel-periclase-calcium aluminate refractory can be used in the transition zone of cement rotary kiln due to its good corrosion-resistance to cement.

关 键 词：尖晶石-铝酸钙轻量骨料 尖晶石-方镁石-铝酸钙 水泥回转窑 抗侵蚀 显微结构 

分 类 号：TQ175.71[化学工程—硅酸盐工业]