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High-aluminum high-strength castable: It is a kind of low-cement castable with a cement content of less than 8%. Unlike ordinary refractory castables, most of the calcium aluminate cement in the matrix is replaced by ultra-fine powder (Ecken), and at the same time, with the addition of appropriate additives, a product that meets and exceeds the performance of ordinary cement castables.
Its main features are as follows:
1. The low content of cement in the castable, that is, the low content of calcium oxide, reduces the generation of low-melts in the material, thereby improving the refractoriness, high-temperature strength and slag resistance of the product.
2. The mixing water consumption of the castable is only about one-half of that of the ordinary castable, thus increasing the compactness of the castable and reducing the porosity.
3. After forming and curing, the generated cement hydrate is less. When heating and baking, there is no large amount of water leakage, which reduces the medium temperature strength. However, as the temperature increases, the material gradually sinters and the strength is continuously improved.
Application: The current high-aluminum high-strength castables are mainly used in industrial kiln of metallurgy, machinery manufacturing, petrochemical, building materials and other industries, and the effect is still relatively good.
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