Castable Refractory

Reformer linings: They can line reformer combustion chambers, catalyst beds and flue gas ducts, and endure chemicals and exhaust gases and high temperatures.
Tundish linings: They can line tundishes, distributors and other molten steel equipment in continuous casting. Erosion and heat resistance.
Glass furnace linings: They can line furnaces, blocks, ports and other locations in glassmaking. They resist molten glass and high temperatures.
Coke oven linings: They can endure high temperatures, gases, and chemicals during coking.

Product Information

What is definition of castable refractory?

Refractory materials are divided into fixed refractory materials and unshaped refractory materials. Unshaped refractory materials usually refer to castable refractory, which are a mixture of various aggregates or aggregates and one or more binders. When used, they must be mixed evenly with one or more liquids, and have strong fluidity and plasticity.

Refractory cement castable is a granular and powdery material made of refractory materials, combined with a certain amount of binder and moisture. It has high fluidity and is suitable for construction using pouring methods. It is an amorphous refractory material that can harden without the need for heating. Composed of refractory aggregates, powders, binders, admixtures, water or other liquid materials. Generally, pouring, vibration, or tamping methods are used on site to form the concrete, and it can also be made into prefabricated components for use.

what is castable refractory used for?

Castable refractory is currently the most widely produced and used amorphous refractory material. Mainly used to construct various integrated structures such as heating furnace linings. Some high-quality varieties can also be used for smelting furnaces. For example, aluminate cement castable refractory can be widely used in various heating furnaces and other thermal equipment without slag and acid alkali erosion. In areas where the working temperature is relatively high due to erosion by molten iron, steel, and slag, such as tapping slots, steel drums, blast furnace shafts, and tapping channels, fire-resistant castable made of high-quality granular and powder materials with high alumina content and good sintering, combined with low calcium and pure high alumina cement, can be used. For example, phosphate refractory castable can be widely used in heating furnaces and soaking pits for heating metals, as well as in areas directly in contact with materials in coke ovens and cement kilns. In some parts of metallurgical furnace and other containers that are in direct contact with the slag and molten metal, the use of high-quality phosphate refractory castable also has good results.

In some areas where the working temperature is not very high and high wear resistance is required, using phosphate castable refractory is more suitable. If corundum refractory materials are used as castable refractory, they generally have good results when used in a reducing atmosphere.

As the lining and furnace body of thermal equipment, it should generally be baked before the first use, so that the physical water and water of crystallization in it can be gradually discharged, to achieve a certain degree of sintering, so that its volume and some properties can reach the stable state when used. The baking system has a significant impact on the service life. The basic principle of the baking system should be that the heating rate should correspond to the possible dehydration and other phase changes and deformations that may occur. During certain temperature stages where these changes occur rapidly, the heating should be slow or even kept for a considerable period of time. If improper baking or rapid heating without baking is used, serious cracks and even loose collapse can easily occur, and explosions may even occur in extremely thick areas.

In addition, castable refractory materials generally have high room temperature strength and can be made into prefabricated components for installation at the kiln spinning site, such as the installation of refractory castable weir plate prefabricated components for the intermediate tank of continuous casting. Refractory castable are mainly used in metallurgical industry kilns, and are also widely used in kilns and thermal equipment in petroleum, chemical, building materials, power, and mechanical industries. Hongtai refractory selles really good quanlity and good price for castable refractory cement, contact us for detail.

Classification of castable refractory materials

Mainly classified by porosity, binder, and aggregate type. In practical use, it is often classified based on usage temperature or functional characteristics.

According to the porosity, there are two types: dense refractory castable and insulation castable refractory with a porosity of no less than 45%.

According to the bonding agent, there are hydraulic bonding, chemical bonding, and cohesive bonding castable refractory.

The hydraulic binding castable set and harden at room temperature and harden through hydration. The main varieties are Portland cement, ordinary calcium aluminate cement, pure calcium aluminate cement, and fused pure calcium aluminate cement castable. Chemically bonded castable generally harden at room temperature by adding a hardening agent to form a chemical reaction. The main varieties include water glass, aluminum sulfate, phosphate castable, etc. Agglomerated castable is hardened by sintering during the calcination process, mainly including clay castable.

According to the refractory aggregate, it can be divided into clayey aggregate (Al2O3 30%~45%), high alumina aggregate (Al2O3% 26ge; 45%), siliceous aggregate (SiO2% 26ge; 85%, Al2O3% 26lt; 10%), alkaline aggregate (magnesia, dolomite, etc.), special aggregate (carbon, carbide, spinel, zircon, nitride, etc.) and thermal insulation aggregate (perlite, vermiculite, ceramsite, floating bead, light brick sand, porous clinker, alumina hollow ball, etc.)