Abstract: In view of the characteristics of high thermal conductivity,great influence of temperature and limited thickness by volume of high alumina castables for the ladle permanent layer,calcium hexaaluminate castables for the ladle permanent layer were developed using calcium hexaluminate aggregates and fine powder,and Al₂O₃ micropowder as main raw materials,and calcium aluminate cement as the binder.The thermal conductivities of the castables at 500,800,and 1 000 ℃ are all about 0.63 W·m^-1·K^-1,less affected by temperature,which perform a good thermal insulation effect.For the permanent layer of a 200 t ladle using calcium hexaluminate castables and thermal insulation board,the average temperatures of the ladle shell were reduced by 30-50 ℃ compared with those of the permanent layer using high alumina castables.It is expected that the cost of calcium hexaluminate castables can be reduced by 20%-35% through suitable aggregate lightweight,consumption reducing and structure optimization.Meanwhile,through decreasing the temperature reduction of hot steel,the production cost of steel plants can be greatly reduced.

Key words: calcium hexaaluminate, insulation refractories, castables, ladle, thermal conductivity

摘要： 针对钢包永久层用高铝质浇注料热导率较高、受温度影响大、厚度受容积限制的特点,以六铝酸钙骨料和细粉、Al₂O₃微粉为主要原料,以铝酸钙水泥为结合剂,研制了钢包永久层用六铝酸钙质浇注料。该浇注料在500、800、1 000 ℃时的热导率均在0.63 W·m^-1·K^-1左右,受温度变化影响小,隔热保温效果好;200 t钢包永久层采用六铝酸钙质浇注料配合绝热保温板使用后,钢包包壁外壳温度与原用高铝质浇注料永久层比较,温度平均降低30～50 ℃。预期通过骨料适度轻量化、减少用量及结构变化,可将六铝酸钙材料的成本降低20%~35%,同时钢水温降减少,可大幅降低钢厂的生产成本。

关键词: 六铝酸钙, 隔热耐火材料, 浇注料, 钢包, 热导率