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How to Choose the Right Castable Refractory

2026-02-26

How to Choose the Right Castable Refractory

Choosing the right castable refractory is crucial for ensuring the stable operation of equipment and reducing costs. Here are the key factors to consider:
- Operating Temperature: Determine the maximum operating temperature of the equipment and select castable refractory with corresponding high-temperature resistance.

- Corrosion Environment: Consider the type and concentration of corrosive media (such as slag, acid, alkali) in the equipment, and select castable refractory with appropriate corrosion resistance.

- Mechanical Load: For parts bearing high mechanical load (such as blast furnace tapholes), select dense castable refractory with high strength and wear resistance.

- Construction Requirements: According to the equipment structure and construction conditions, select castable refractory with appropriate workability (fluidity, plasticity).

- Cost-Effectiveness: Balance performance and cost, and select castable refractory that meets the requirements and has high cost-effectiveness.

The performance of castable refractory not only depends on its quality but also on proper installation and maintenance. Incorrect construction can lead to lining cracks, peeling, and premature damage, affecting the service life of the equipment.

1. Installation Tips for Castable Refractory

- Material Preparation: Before construction, ensure that the castable refractory is stored in a dry, ventilated environment to prevent moisture absorption. Mix the castable refractory with the appropriate amount of water (or other additives) according to the manufacturer’s instructions, and stir evenly to ensure uniform fluidity.

- Mold Installation: For pouring construction, install the mold firmly, ensuring that the mold surface is smooth and free of gaps. The mold should be made of materials that are easy to demold, such as steel or wood.

- Pouring and Tamping: Pour the mixed castable refractory into the mold evenly, and use a vibrator to tamp it to eliminate air bubbles and ensure the density of the lining. Avoid over-vibration, which may cause segregation of aggregates and powders.

- Curing and Demolding: After pouring, allow the castable refractory to cure at room temperature for a certain period (usually 24-72 hours) to ensure sufficient strength. Demold only when the strength reaches the required standard to avoid damage to the lining.

- Baking: After demolding, bake the castable refractory lining according to a specific temperature curve to remove moisture and residual organic matter. Slow heating is essential to prevent thermal shock and cracking—especially in the temperature range of 150-500℃.

2. Maintenance of Castable Refractory Lining

Regular maintenance can extend the service life of castable refractory lining:

- Regularly inspect the lining for cracks, peeling, or erosion, and repair small damages in a timely manner using the same type of castable refractory.

- Avoid rapid temperature changes in the equipment, which can cause thermal stress and damage to the castable refractory lining.