The advantages of refractory castables are obvious compared to refractory bricks. The production process of refractory castable is simple, labor-saving and energy-saving, high construction efficiency, good quality, and can be prepared on-site or select materials with excellent performance according to needs. Therefore, the refractory castable is an unshaped refractory with a large amount and a wide range of applications in furnace construction. So, what are the main application industries of refractory castables? The Rongsheng refractory castable manufacturer will explain based on the following refractory lining materials for industrial kilns.
Kinds of Refractory Castables for Furnace Lining
1. Application of castables in cement rotary kiln
In the new dry-process cement rotary kiln, castables (http://www.aluminabricks.com/refractory-castable/) have been widely used. There are many types of refractory castables used in this kiln. According to the different working environments of the kiln, the following types of castables are used. Ordinary refractory castables, ultra-low cement refractory castables, non-cement refractory castables, steel fiber refractory castables, explosion-proof refractory castables, anti-skinning refractory castables, phosphate refractory castables, alkali-resistant castables, heat insulation Castable. In addition, there are new types of castables such as self-flowing refractory castables.
2. Application of castable in glass melting furnace
Due to the requirements of the working environment of the glass melting furnace, the castable used should have the characteristics of good high-temperature resistance, strong resistance to corrosion of molten glass, and low porosity. The main refractory castables used are fused silica castables, corundum castables, lightweight mullite castables, and so on.
3. Application of castables in metallurgical industry
1) Castable for ironmaking system.
In the ironmaking system, there are many refractory castables used in the blast furnace taphole, and ASC refractory castables are generally used. ASC castables are generally low cement or ultra-low cement castables, mainly composed of Al2O3 aggregate, SiC, carbon, cement, and various additives.
2) Castable for hot metal pretreatment.
Refractory castables are mainly used in the application of molten iron ladle with alumina-silicon carbide carbon castables in the furnace bottom, molten pool, and slag line; spray guns are important devices for hot metal pretreatment. Since the middle and late 1980s in our country, spray gun refractories have gradually developed into castable integral casting spray guns, whose materials are mainly Al2O3-SiO2 series. The integral spray gun made of this castable has the characteristics of uniform organization, no joints, good thermal shock resistance, and long life.
3) Castable for electric furnace steelmaking.
The application of refractory castables in electric furnaces is mainly concentrated in the area of the furnace cover. In the late 1990s, the fully water-cooled furnace top technology was widely adopted, and the castable integral prefabrication technology was generally used in the electrode triangle area. On the whole, the integral castable furnace cover may become a development trend of electric furnace cover materials in the future.
4) Castable for refining outside the furnace.
There are four types of castables for refining outside the furnace. High-aluminum castables and aluminum-magnesium castables are used in a small amount in the RH furnace lining. The upper part of the RH vacuum chamber adopts Al2O3-MgO·Al2O3 castable integral lining or gunning integral lining, and integral aluminum-magnesium castable on the outer wall of the RH furnace dip tube. LF furnace castables are also castables for refining outside the furnace. The materials used for the curtain wall of the LF furnace cover are mainly high-aluminum or corundum series castables. High alumina-spinel refractory castables are mostly used to pour large bricks in the impact area of the bottom of the package. The third type is the castable for CAS refining device. The CAS refining device is divided into upper and lower parts. The refractory materials used are all castables. The upper part is mostly low-expansion Al2O3-SiO2 castables, and the lower part is mostly corundum-spinel series castables with fused corundum and MgO superfine powder. In the later stage, in order to extend the service life of the device, magnesia-aluminum gunning materials are mostly used.
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