Corundum Refractory Castable

The corundum refractory castable is to add a certain proportion of corundum material, granules or powder, add a certain large density high aluminum material, and powder, promote fluidity material, add a binder to make a mixed material called corundum castable, proportion The content and density that are different are not the same. The lowest density is above 2.7kg/cm3 is the corundum castable, which is generally used in the high temperature area of the furnace.

The composition of corundum is a-AI2O3, which belongs to the trigonal system, the crystal form is short columnar, the true density is 3.85-4.0g/m3, the melting point is 2050 degrees, corundum also has high thermal conductivity and electrical insulation, and excellent chemical stability And resistance to reduction, corundum can be used as a high-temperature refractory raw material, and is also a better artificial abrasive.The material is pided into sintered corundum and fused corundum, which are pided into brown corundum, white corundum, zirconium corundum, chromium corundum, etc.

The high-strength corundum wear-resistant castable is mainly made of corundum and chromium oxide powder as the main raw materials. The product has the characteristics of high temperature strength, good wear resistance and stable thermal shock performance. Can be made into prefabricated bricks, baked at low or high temperature.

High-strength corundum wear-resistant castables are high-grade indefinite refractory materials with stable high temperature resistance, which can be used in carbon black reaction furnaces, petrochemical furnaces, heating furnaces, waste incinerators, non-ferrous metal smelting furnaces and iron hook materials.

Chrome corundum castables are easy to construct, can be cast on site or can be made into prefabricated parts, which is convenient and fast.

Features

Corundum refractory castable is made of corundum, super high-aluminum clinker and silicon carbide, etc., and is composed of composite binder, water-reducing agent, dispersant, etc. This product has high wear resistance, erosion resistance and resistance Aggressive.

High strength, good volume stability, excellent anti-erosion performance, not affected by reducing gases such as H2 and C0. The use temperature can reach more than 1800 degrees.

Application

Corundum refractory castable has strong self-flow through its own position difference, and the construction is easy and convenient. Commonly used in CFB boilers and other thermal equipment where the erosion is severe and difficult to construct.

On the equipment, it can also be used to repair the lining of the kiln to obtain a good use effect

Conservation

Curing is one of the important factors that determine the performance of refractory castables, and it is also the most easily overlooked factor. The quality of curing after demolding directly affects the service life and use effect of casting materials. Curing is to make the binder in the casting materials. There is setting and hardening time to obtain sufficient initial strength.

Therefore, after the construction of the castables is completed, maintenance should be carried out in time, and the mold removal should be decided according to the specific situation. At the same time, the order and method of mold removal should also be paid attention to. When curing, use a wet sack or mat to cover the surface of the castable project and sprinkle water in time to keep it moist. For the parts that are not convenient to cover, use a sprayer to spray water on the surface of the casting material for oxygen protection. The curing time is preferably not less than 2 days. The curing process must be careful to fully exert the effect of the castable.

Physical And Chemical Indicators