What is composite refractory castable?

Composite refractory castable is a monolithic refractory material made by mixing a variety of raw materials in different proportions of aggregate and fine powder and then adding different proportions of binders.

Why is composite refractory castable needed?

As the service life of multiple furnace types and multiple furnace lining components increases, a variety of raw materials are needed to make composite refractory castables to resist the erosion of various furnace lining atmospheres. Basically, more than 70% of the castables currently used in the market are composite refractory castables.

Clay castables and high-aluminum castables are castables with a single component, while low-cement castables also have a variety of composite component castables. For example, adding silicon carbide becomes silicon carbide high-aluminum low-cement castables. , and adding mullite is to add a certain proportion of mullite to the bauxite raw material, or add a certain proportion of corundum. In fact, corundum is also bauxite, but those with an aluminum content of more than 90% are called corundum materials.

In addition, according to different needs, olivine, chromium, andalusite, kyanite, sillimanite, cordierite, etc. are added as composite refractory castables. For use in some special parts, a variety of ingredients can also be added. The three-layer compounding of raw stone, silicon carbide, and corundum is also a composite castable to increase the service life of special parts. Some also add green silicon carbide for better performance.

There are more castables that add silicon carbide composites because the blast furnace trench and some wear-resistant parts use multiple composites. Therefore, in the current use of refractory materials, there are more and more multiple composite materials. Especially under the major task of environmental protection, the lining atmosphere of the garbage incinerator is multi-complex, and the corrosion and wear conditions are intertwined, which cannot be determined by a certain corrosion component. Therefore, triple or even quadruple composite refractory castables have appeared. Lining to resist various erosions of the lining.

However, in general, the proportion of chromium added cannot be high, because chromium pollution also introduces unnecessary damage. Therefore, in general, the composite ingredients are determined based on different furnace types, different temperatures, and different degrees of corrosion. To increase the service life of the refractory castable lining.