Refractory castable is a granular and powdery material made by adding a certain amount of binder to refractory materials. It has high fluidity and is suitable for forming amorphous refractory materials by pouring.
Compared with other amorphous refractory materials, refractory castables have higher binder and moisture content, hence better fluidity. They have a wide range of applications and materials and binders can be selected according to usage conditions. They can be directly cast into linings for use or made into prefabricated blocks using casting or vibration methods.
In cement plants, the use of castables is very extensive, in preheaters, kiln tails, tertiary air ducts, grate coolers, and so on, all require their use. Depending on different operating conditions, different types and models are used, including high-alumina alkali-resistant, anti-spalling, wear-resistant, and specialized for coal injection pipes, among many others.
Cement is a powdery hydraulic inorganic binder. When mixed with water, it forms a slurry that can harden in air or better in water, bonding materials like sand and stone together firmly. Cement is an important building material, and mortar or concrete made from it is strong, durable, and widely used in civil engineering, water conservancy, national defense, and other projects.
Refractory cement, also known as aluminate cement, is made from bauxite and limestone, calcined to produce clinker mainly composed of calcium aluminate with an alumina content of about 50%, which is then ground into a hydraulic cementitious material. According to the national standard (GB201—2000), the density and bulk density of aluminate cement are similar to ordinary Portland cement. Its fineness is specified as specific surface area ≥300m2/kg or residue on a 45μm sieve ≤20%. Aluminate cement is divided into four types: CA-50, CA-60, CA-70, and CA-80, and the setting time and strength at various ages of each type of cement must not be lower than the standard requirements.
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