Development and application of new generation calcium hexaaluminate castables
In view of the characteristics of high thermal conductivity,great influence of temperature and limit-ed 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·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.
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