High alumina refractory castable with high alumina bauxite 63-75%, high alumina cement 7-12%, silica fume and alumina powder 5-8%, bauxite fine powder 16-28%, admixture 0.3% According to the requirements of the project construction, some retarders or accelerators can be added. This formulation is not critical. The key to hitting is to choose a variety of materials and mix ratios, and to do a good job in the preparation and application of the materials, so that the carding function of the refractory castable is best reached as the hitting point. It is not fixed. Unmoved, the quality of the material is different, and concrete has a trademark logo. Considering application regulations, reaching the estimated application efficacy is the most critical. Many high-quality features of high aluminum refractory castables:
1. Low water requirement for project construction, usually 6-7% of the net weight of refractory castables, so it has high relative density and low porosity;
2. It has excellent volume reliability at high temperature. Although it is a non-burning refractory insulation material, its volume is reduced after boring and boring.
3. Not only has a high dry solid compressive strength at normal temperature, but also does not reduce the compressive strength after the medium temperature and high temperature solution, the absolute value of compressive strength is 3-5 times that of traditional refractory castables;
Concrete usage is low, and the calcium content in the castable is only 1 / 4-1 / 3 of the traditional refractory castable. Therefore, the total number of low-medium melting phases of the low-concrete castable is reduced, thereby further improving the high-temperature function.
