How To Use Refractory Castables

The use of refractory castables affects the quality of the entire project. If it is not used in a standardized manner, it is easy to cause problems in the project, thus affecting the commissioning and use. So how should the castables be used, and what should be paid attention to?

1. Preparation: Before construction, all construction tools and areas should be cleaned to avoid the performance degradation of refractory castables due to impurities. If necessary, the foundation or support should be repaired and reinforced first.

2. Mixing refractory castables: When mixing refractory castables, a forced mixer should be used for stirring. When adding water, clean water with clean water quality should be used. Sewage and water containing harmful impurities should not be used. The amount of water added should be strictly added according to the manufacturer’s requirements. When mixing, first pour the dry material and additives into the mixer, dry mix for 2-3 minutes, then add water until the material is evenly mixed before discharging, and the mixed refractory castable should be used within 30 minutes.

3. Pretreatment of pouring: Before pouring, butter or engine oil should be applied to the pouring surface of the casting mold to facilitate demoulding. Secondly, it is necessary to ensure that the surface of the pouring area is moist to avoid premature water loss of the casting material due to dry water absorption.

4. After pouring: It is necessary to vibrate the inside of the casting material with a vibrating rod to expel the internal air. The vibration should be slow and orderly to prevent holes from being left. Generally, it is better to turn out no large bubbles. At the same time, the surface is re-slurry, the exhaust is less and there is no sedimentation.

5. Leveling and polishing: After the casting material is just poured and slightly solidified, you can use tools such as a knife, cotton mop, or trowel to level and polish the surface to ensure overall flatness and smoothness. This helps to improve the strength and appearance quality of the casting material.

6. Maintenance: After the casting is completed, demoulding can be carried out 24 hours later. After demoulding, the casting can be oxidized at room temperature. It can be maintained by spraying water, covering it with a protective film, or applying a curing agent, usually for about 3 days.

7. Furnace drying: After the entire kiln project is poured, the kiln should be heated and dried to completely remove the internal moisture, which gradually increases the working strength of the kiln castable. Therefore, the furnace should be dried strictly according to the furnace drying curve to ensure the quality of the furnace.

Please note that before using the castable, you should read and comply with the relevant instructions and safety operating specifications in detail. The specific usage methods and steps may vary depending on the castable.