【摘要】 利用低水泥浇注料技术,采用粒径≤0. 074mm的一级矾土和粒径 <8mm的二级矾土为主要原料,水泥和二氧化硅微粉作为结合系统,并引入适量外加剂制备了Al2O3 -SiO2 系浇注料试样。通过对系列试验配方进行优选,确定满足设计指标要求的生产配方,依照该配方生产出炭素焙烧炉用大型预制件。检测结果表明:生产的预制件的强度、抗热震性和 1350℃ 3h烧后的永久线变化率等性能都满足设计指标要求。显微结构分析表明,预制件 1350℃ 3h烧后的基质中有大量莫来石晶相,另有少量石英和玻璃相。更多还原

【Abstract】 Low cement castable technique is used to design the series experimental formulations of the precast blocks for carbon baking furnace,in which 70% Al₂O₃ bauxite is used as main raw materials,cement and silica fume as bonding system and some more suitable additives selected to improve workability.After comparison experiments,optimized formulation is determined to produce the precast blocks.The results show that properties of the precast blocks,including strength,thermal shock resistance and permanent linear change after heat treatment both at 110 ℃ for 24 h and at 1350 ℃ for 3 h,can meet the required designing standards.Main phase of the blocks after heat treatment at 1350 ℃ for 3 h is mullite,and some quartz and glass phase are also observed by SEM.更多还原