Castable

Unstructured refractory materials usually refer to castables, which are mixed powder particles composed 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.
Castable material is a granular and powdery material made of refractory material, with a certain amount of binder and moisture added together. It has high fluidity and is suitable for construction by pouring method. It is an amorphous refractory material that can harden without heating. Composed of refractory aggregate, powder, binder, admixture, water or other liquid materials. Generally, it is poured, vibrated, or compacted on-site, and can also be made into prefabricated parts for use.
1. Types
Mainly classified by porosity, binder, and aggregate variety. In practical use, it is often classified based on usage temperature or functional characteristics.
There are two types of refractory castables based on porosity: dense refractory castables and insulation refractory castables with porosity not less than 45%.
According to the binder, there are three types of refractory castables: hydraulic bonding, chemical bonding, and cohesive bonding.
2. Characteristics
Castable material is currently the most widely produced and used amorphous refractory material. Mainly used for constructing various heating furnace linings and other overall structures.
As the lining and furnace body of thermal equipment, it is generally necessary to bake it before the first use to gradually remove the physical and crystalline water, achieve a certain degree of sintering, and make its volume and certain properties reach a stable state during use.
3. Application
External refractory castables generally have high room temperature strength and can be made into prefabricated parts for installation at the kiln rotary work site, such as the installation of refractory castables weir plate prefabricated parts for the intermediate tank of continuous casting (see page 20 of the color image insert). Refractory castables are mainly used in metallurgical industry kilns, and are also widely used in petroleum, chemical, building materials, power and machinery industry kilns and thermal equipment.