Abstract: To improve the thermal efficiency of cement kilns,lightweight periclase-hercynite refractories for cement kilns were prepared using self-made lightweight magnesia,sintered magnesia,and hercynite as raw materials.The effects of replacing 3-1 mm sintered magnesia with equal mass fractions (0,10%,20%,30%,and 40%) of self-made lightweight magnesia on the bulk density,apparent porosity,cold compressive strength,thermal shock resistance,refractoriness under load (RUL),and cement clinker corrosion resistance of the samples were investigated.The results show that:(1)as the lightweight magnesia addition increases,the bulk density of the samples decreases and the apparent porosity increases;(2)lightweight magnesia can form an interlocking interface with the matrix,thereby enhancing the cold compressive strength and improving the thermal shock resistance of the samples;(3)the appropriate addition of lightweight magnesia improves the cement clinker corrosion resistance of the samples and reduces the corroded area;(4)when the lightweight magnesia addition reaches 20%,the samples exhibit the optimal comprehensive performance,with the bulk density of 2.78 g·cm^-3,apparent porosity of 21.9%,cold compressive strength of 76.2 MPa,and refractoriness under load exceeding 1 700 ℃.

Key words: lightweight magnesia, lightweight periclase-hercynite brick, corrosion resistance to cement clinker, microstructure

摘要： 为了提高水泥窑的热效率,以自制的轻量化镁砂、烧结镁砂、铁铝尖晶石为原料制备水泥窑烧成带用轻量化方镁石-铁铝尖晶石材料。研究3~1 mm的轻量化镁砂等量替代同粒度的烧结镁砂(替代质量分数分别为0、10%、20%、30%、40%)对试样体积密度、显气孔率、常温耐压强度、抗热震性、荷重软化温度、抗水泥熟料侵蚀等性能的影响。结果表明:1)随着轻量化镁砂加入量的增加,体积密度减小,显气孔率增大;2)轻量化镁砂能够与基质形成互锁界面,使常温耐压强度增大,抗热震性增强;3)加入适量的轻量化镁砂能够提高试样抗水泥熟料侵蚀性能,减小侵蚀面积;4)当轻量化镁砂加入量为20%(w)时,试样的综合性能最优,体积密度为 2.78 g·cm^-3,显气孔率为21.9%,常温耐压强度为76.2 MPa,荷重软化温度高于1 700 ℃。

关键词: 轻量化镁砂, 轻量化方镁石-铁铝尖晶石材料, 抗水泥熟料侵蚀, 显微结构