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In the high-temperature furnaces of modern industry, there is a material that plays a critical role in ensuring the stable operation of equipment due to its excellent refractory, wear-resistant, and corrosion-resistant properties—high alumina castable.
High alumina castable shows its superior application effects in several key parts of cement rotary kilns, such as kiln door coverings, grate coolers, preheaters, decomposers, and tertiary air ducts. This material is not only suitable for these specific parts; its broad application range also includes diverse high-temperature equipment such as various heating furnaces, soaking pits, heat treatment furnaces, and rotary kilns.
High alumina castable is widely favored in industries like metallurgy, building materials, and chemical industries due to its excellent refractory and wear-resistant properties. In the metallurgical industry, whether it's the lining, furnace wall, or furnace top of blast furnaces, ladles, iron pots, electric furnaces, or converters, high alumina castable can ensure the stable operation of equipment with its excellent ability to withstand high temperatures, high pressures, and highly corrosive gases.
In the building materials industry, the linings and furnace tops of construction production equipment like cement kilns and glass kilns widely use high alumina castable. This is mainly because it can effectively resist high-temperature flue gases and chemically aggressive flue gases, while also demonstrating long life, low permeability, and outstanding wear resistance, significantly extending the equipment's service life.
Moreover, in the chemical industry, whether in petrochemical, metallurgical chemical, or alkaline chemical fields, high alumina castable provides strong resistance to high-temperature acidic and alkaline substances and excellent corrosion and wear resistance, ensuring the normal operation of the equipment.
High alumina bricks and high alumina castable materials are both important members of the refractory material family and are widely used in the construction of high-temperature industrial kilns. They share a notable feature: a high content of Al2O3, which grants them excellent high-temperature erosion resistance. However, despite this commonality, they have significant differences.
First, in terms of form, high alumina brick is a type of shaped refractory material. Each high alumina brick has a fixed shape and size. In contrast, high alumina castable is an unshaped refractory material; it has no fixed shape and is usually in powder form and stored in bags, offering greater flexibility.
In terms of production, there are obvious differences between the two. The making process of high alumina bricks is relatively complex, requiring precisely proportioned raw materials to be formed under high pressure and then sintered at high temperatures to finally form solid shaped bricks. In contrast, the production of high alumina castable omits the high-temperature sintering and shaping steps. Once the raw materials are proportioned, they are directly bagged, simplifying the production process.
Finally, in terms of construction methods, high alumina bricks and high alumina castable are made from high alumina cement but also have their characteristics. High alumina bricks can be directly used during construction and are usually combined with high-temperature mortar to ensure a tight fit between the bricks. In contrast, high alumina castable needs to be mixed with water first and then poured into pre-prepared molds, air-dried until shaped. After shaping, the entire kiln needs to be baked to ensure the castable is fully cured before it can be put into use. Although this construction method involves more steps, it also offers higher customization and adaptability.
