Why does the high aluminum castable have cracks after furnace baking?

Improper furnace drying operation may cause castable cracks and other engineering quality accidents. Furnace drying is a crucial link before the operation of high-aluminum castable after construction, which directly determines the future service life of the kiln. When high-alumina castables are dried in the furnace, the furnace preparation should be done well, the furnace drying time should be controlled well, and the furnace heating curve should be operated under strict conditions.

Reasons for cracks in high-aluminum castable after furnace baking

1. When the high-aluminum castable is wet-mixed, the amount of water added is not controlled well. Adding too much water will cause the castable to have insufficient bonding strength, which will cause the castable to fall off. Adding too little water will also greatly weaken the performance of the castable. Therefore, the amount of water added must be strictly controlled according to the proportion and the instructions.

1. When the castable is baked in the furnace, the temperature rises too fast. When the castable is baked in the furnace, the boiler heating curve must be controlled. When baking the furnace, the construction personnel will formulate the baking curve according to the boiler conditions. When baking in the furnace, the heating temperature of the castable is strictly controlled to avoid rapid heating and rapid cooling.
2. When the high-alumina castable is cured, the curing time is not enough, resulting in the strength of the molded castable not being achieved. Under normal circumstances, when the temperature is high, the curing time of the castable is 24 hours, and in the colder winter, the curing time of the castable is 48 hours. Due to the low temperature, a small amount of accelerator will be added to speed up the coagulation of the castable.

Curing of high-temperature castables after baking

If the cracks after the castable is baked are not obvious or serious, it is necessary to check it in time and repair it with the same castable.

If the cracks are large or the castable falls off, the construction personnel need to find a solution to the problem and repair it with a new castable.