Introduction to refractory castable construction technology and precautions

      With the continuous increase of cement clinker production lines nationwide, the requirements for the construction and use of refractory castables are getting higher and higher. For better use of refractory castables, reduce the consumption of castables. The following is a brief introduction to the refractory construction process and precautions.

      Pre-construction preparation and strict inspection contents:

      The equipment to be cast and the site to be cleaned; the construction machine is in good condition; the anchor material, type, size, arrangement and welding (fixed) quality, metal anchors are used for expansion compensation treatment; and the preventive measures for wet water with castables such as surrounding refractory bricks Whether the pre-tested castables are ineffective; the water quality should meet the drinking water standards; the above experience is accepted and the construction is ensured without interruption.

Construction requirements:

1. Molding: It is made of steel plate or hard wood board. The steel plate is coated with release agent. The wooden board should be brushed with waterproof paint and should not leak slurry. It should have sufficient strength.

2. Stirring: use a forced mixer, first pour the castable into the machine, and take out the additive pouch and pour it into it. Mix it for 2-3 minutes, add water for 3-5 minutes, add less water, and add less water. The amount of water is 7.0-7.5%.

3. Vibrating: The pouring material poured into the mold should be layered and tapped immediately with the vibrating rod. It must not be leaked and vibrated and re-vibrated at the same position to avoid segregation and holes in the castable. The stirred castable must be removed from the water to the end of 20-30 minutes, and the initial aggregate should be discarded. The expansion joint is designed to be left behind.

4. Maintenance: After the surface of the castable is dry, it can be demolded with 70% strength. The mold removal time is ≥24 hours, and the curing time is ensured ≥24 hours.

5. Drying: According to the different grades and the thickness of the castable lining and the climatic conditions of the site, the user must provide sufficient baking time to ensure that the water is not bursting. The required baking time is ≥72 hours.

Precautions:

1. Strictly control the amount of water added. The room temperature in winter must be greater than 5 °C, and there are certain antifreeze measures.

2, must use a forced mixer mixing, artificial mixing is strictly prohibited.

3, anchor nails must be added with an expansion cap or brush asphalt paint.

4. This product is strictly prohibited to be mixed with other grades of castables.

5. The retention period is 3 months.