Refractory castables are an important refractory material, widely used in high-temperature equipment and structures in metallurgy, chemical industry, cement, power and other industries. According to different ingredients, uses, refractoriness and construction methods, refractory castables can be classified in many ways. These classifications and their characteristics will be introduced in detail below.

1. Classification by composition
Acidic castables

Composition: The main component is silicon dioxide (SiO₂), which usually contains a high proportion of acidic materials, such as aluminum silicate ore.
Characteristics: Good acid resistance, strong resistance to acidic atmosphere and molten metal, but poor tolerance to alkaline substances.
Application: Widely used as refractory materials in acidic environments such as chemical equipment, oil refining, pickling tanks, etc.
Alkaline castables

Composition: Mainly composed of materials such as magnesium ore and bauxite.
Characteristics: It has excellent alkali resistance and is suitable for contact with alkaline substances at high temperatures.
Application: Commonly used in steel smelting, furnace lining of molten metal, etc.
Neutral castable

Ingredients: mainly bauxite, often containing a certain proportion of acidic and alkaline components.
Features: strong refractory, suitable for neutral molten metal and high temperature atmosphere.
Application: suitable for a variety of industrial furnace linings.
2. Classification by use
Furnace lining castable

Use: mainly used for the lining of high-temperature furnaces to provide necessary refractory protection.
Features: the material is required to have high refractoriness, wear resistance and thermal stability to resist high temperature and chemical erosion.
Casting castable

Use: used for the production of casting molds to help form precise castings.
Features: has excellent fluidity and thermal shock resistance, can adapt to high temperature casting process.
Refractory brick castable

Use: used to make refractory bricks and refractory blocks.
Features: requires high mechanical strength and good wear resistance.
3. Classification by refractoriness
High aluminum castable

Refractory: generally above 1300℃, some special high aluminum materials can reach above 1700℃.
Features: High-aluminum castables have excellent refractory properties and thermal shock resistance, and are suitable for use under high temperature conditions.
Special refractory castables

Ingredients: including zirconium-containing castables, carbon-containing castables, etc.
Features: Designed for specific environments and needs, with special high temperature resistance and corrosion resistance.
4. Classification by construction method
Self-leveling castables

Features: It has good fluidity, can be naturally leveled under gravity, and is easy to construct.
Application: Commonly used in applications with high surface requirements.
Vibration castables

Features: Vibration equipment is used to make the material more compact and improve the mechanical strength of the refractory castable.
Application: Suitable for construction occasions requiring higher density and strength.
Summary
The diversity of refractory castables enables it to meet the needs of different industrial applications. When selecting suitable refractory castables, factors such as its composition, purpose, refractoriness, and construction method should be comprehensively considered to ensure that the performance of the material can adapt to the specific working environment. In practical applications, the reasonable selection and use of refractory castables can significantly improve the durability and work efficiency of equipment. With the advancement of technology, the performance and types of refractory castables are also constantly developing. In the future, more high-performance refractory materials may appear to adapt to more demanding industrial conditions.