When the porous clinker refractory castable raw materials and mix ratio is certain, the larger the bulk density, the bigger the drying bending strength. High temperature injury strength also has a similar law. It should be noted that the main performance of lightweight refractory castable is the bulk density, strength, burning line changes and thermal conductivity, the four factors are closely related, and thus it shall be have integrated, comprehensive evaluation. When the bulk density is increased, the strength is improved and the post-burning line is improved, but the thermal conductivity is increased, which is disadvantageous.

In the ingredients of light refractory castable, the refractory aggregate is mainly clay porous clinker, its firing quality is improved, the grain gradation tends to be reasonable, so it can improve the performance of castable; binding agent to reduce the amount, generally 20 ~ 30%, while increasing the high-alumina powder; in order to improve the sintering performance of refractory castable and reduce its burning line shrinkage, can be mixed with soft clay and kyanite and other externally, the general amount of 3 to 10% The At the same time also doped with superplasticizer and other admixtures, so that the amount of castable water will be 17 to 25%. The use of these technical measures, the preparation process is basically the same, while the cost increases not much, and the performance is much improved.

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