Precast refractory shapes are non-standard and complex shaped components widely used in various industries,
including steel, petrochemical, oil, ceramics, and heat treatment. These shapes are manufactured from a combination of refractory cements and aggregates based on aluminosilicates (bauxite, andalusite, chamotte), magnesia, and alumina.
Manufacturing Process
One of the common methods for producing these shapes is the vibrocast method.
In this process, the refractory material mixture is poured into specialized molds and subjected to vibration to achieve compaction and de-aeration. Once the mixture has solidified, the shape is removed from the mold and fired at high temperatures.
Classification
Precast refractory shapes are classified into two categories based on their alumina content: lightweight (with low alumina content) and heavy-duty (with high alumina content).
Applications
Steel and Reheating Industries
- Chock tiles
- Burner tiles
- Burner blocks
- Sight holes
Petrochemical Industries
- Lintel blocks
- Deflectors
Oil Industries
- Muffle blocks
- Access doors
Ceramic Industries
- Burners for roller and shuttle kilns
Heat Treatment Furnaces
- Air nozzles
- Burner blocks for furnace burners
Advantages of Using Precast Refractory Shapes
- High Dimensional Accuracy: These shapes are manufactured using precise molds, resulting in highly accurate dimensions and sizes.
- High Resistance: These shapes exhibit excellent resistance to heat, corrosion, abrasion, and thermal shocks.
- Long Service Life: Due to their high quality and durability, these shapes have a long lifespan, eliminating the need for frequent replacements.
- Cost Reduction: Utilizing these shapes can significantly reduce construction and maintenance costs for furnaces and other equipment.
- High Versatility: These shapes are available in various shapes, sizes, and with diverse raw materials, catering to a wide range of applications.
Considerations for Selecting Precast Refractory Shapes
- Appropriate Type Selection: Choose the right type of precast refractory shape based on the intended application and operating conditions.
- Raw Material Quality: Ensure the shapes are made from high-quality and premium raw materials.
- Reputable Brand: Opting for shapes from reputable and well-known brands can guarantee their quality and performance.
- Cost-Effectiveness: The price of precast refractory shapes can vary depending on their type, quality, and brand.
Leave a Reply