Industry Knowledge of Magnesia-Alumina Spinel Refractory Castables

The magnesia-alumina spinel refractory castables are widely used in many high-temperature industrial applications. These castables are made of a blend of magnesia and alumina spinel, which provides excellent thermal resistance and refractoriness.

There are several grades of magnesia-alumina spinel refractory castables classified based on their alumina content. Low-alumina castables contain less than 30% alumina and are suitable for temperatures up to 1650°C. Medium-alumina castables have an alumina content of 30-60% and are capable of handling temperatures up to 1750°C. High-alumina castables contain more than 60% alumina and can withstand temperatures up to 1850°C.

The technical parameters of magnesia-alumina spinel refractory castables include high-temperature strength, thermal shock resistance, abrasion resistance, and chemical resistance. The castables are used in applications such as ladles, tundishes, and electric arc furnaces because they can withstand the extreme temperatures, chemical attacks, and thermal cycling involved in these processes.

The production process of magnesia-alumina spinel refractory castables involves blending of the raw materials, dry mixing, wet mixing, and casting. The raw materials are usually calcined at high temperatures to eliminate impurities and improve reactivity. The dry mixing involves weighing and mixing of the raw materials, while wet mixing involves the addition of water and a binder to form a homogeneous mixture. The casting process involves pouring the mixture into molds and allowing it to set.

The use of magnesia-alumina spinel refractory castables has significantly improved the efficiency of many high-temperature industrial processes. Their excellent thermal and chemical resistance make them ideal for use in many harsh environments. The industry continues to explore new applications for these castables as they prove to be a reliable and cost-effective solution for many refractory needs.