Heat Curing
Heat Curing
The heat curing application varies in direct proportion to the material used.
Heat Curing for Ceramic Bonded – Heat-Setting Plastic Refractory
Heat Curing for Ceramic Bonded – Heat-Setting Plastic Refractory
In heat-setting plastic refractories (excluding the CH group), the drying process should be started as soon as possible without losing time after the application is completed. The material begins to harden slowly after its contact with air. In order for the applied lining to exhibit its full performance characteristics, a low-temperature drying must be performed.
It is recommended that the drying characteristics be as follows:
• Bring the environment to 80-90°C with a heating rate of 17°C / hour.
• Wait at this temperature for 6 hours.
• Bring the ambient temperature to 150°C with the same heating rate.
• Wait at this temperature for 5 hours.
• Bring the environment to 350°C with a heating rate of 17°C / hour.
• Then, keep the furnace temperature stable for 1 hour for each 25 mm of applied plastic.
• Then, go above 50°C of the operating temperature with a heating rate of 25-30°C / hour.
Notes:
The heat curing application is normally much more detailed than the schedule given above. Information such as burner size, gas outlet area, air volume, and flow rate must be known and evaluated. At this point, Kiltaş recommends that you contact experts regarding heat curing.
If the heat curing application is interrupted for any reason, Kiltaş recommends starting the application from the very beginning. By using initiative, the system can be restarted, and after the system is reheated to the temperature where the interruption occurred and stabilized at this temperature for a certain period, the remaining process can be continued. However, as Kiltaş, we accept no responsibility for product degradation that may occur in this case.
Heat Curing for Phosphate Bonded – Air-Setting Plastic Materials
Heat Curing for Phosphate Bonded – Air-Setting Plastic Materials
It is necessary to ensure the controlled evacuation of water within the plastic material, and to prevent potential steam pressure accumulation and spalling caused by steam. Prevent drying and peeling by protecting the refractory surface with a nylon tarp, cloth, or sack. Nylon is generally used for this purpose. If cloth or sack is used, the fabric should be wetted by spraying water on it to preserve moisture and prevent surface dryness. Once the heating process is started, it must continue until it is completed. Do not stop the heating process.
• Bring the environment to 150°C with a heating rate of 25°C / hour.
• Wait at this temperature for 1 hour for each 25 mm of thickness. Do not exceed 8 hours.
• Raise the temperature to 325°C with a heating rate of 25°C / hour.
• Wait at this temperature for 1 hour for each 25 mm of thickness. Do not exceed 8 hours.
• Raise the temperature to 550°C with a heating rate of 25°C / hour.
• Wait at this temperature for 1 hour for each 25 mm of thickness. Do not exceed 8 hours.
• After making the required wait at 550°C, raise the ambient temperature to the operating temperature with a heating rate of 24°C / hour. If the system will not be operated and will be cooled, wait at the operating temperature for 1 hour for each 25 mm and then leave it to natural cooling, but do not allow the cooling rate to exceed 38°C / hour.
Notes:
The heat curing application is normally much more detailed than the schedule given above. Information such as burner size, gas outlet area, air volume, and flow rate must be known and evaluated. At this point, Kiltaş recommends that you contact experts regarding heat curing. If the heat curing application is interrupted for any reason, Kiltaş recommends starting the application from the very beginning. By using initiative, the system can be restarted, and after the system is reheated to the temperature where the interruption occurred and stabilized at this temperature for a certain period, the remaining process can be continued. However, as Kiltaş, we accept no responsibility for product degradation that may occur in this case.
Heat Curing for Concrete Refractories
This heat curing is provided for informational purposes for small and medium-scaled enterprises. It varies depending on the amount and thickness used, and you can contact our company for different heat curing applications. The correct application of heat curing to concrete refractories and the controlled removal of the water they contain are very important in terms of the refractory exhibiting full performance under operating conditions and its lifespan. The heat curing schedule for concrete refractories is generally as follows:
• As a start to the heat curing application, raise the ambient temperature to 100°C with increases of approximately 17°C/hour.
• Wait between 100°C - 250°C for a minimum of 24 hours, provided that the temperature is not increased until its steam release is finished.
• Wait between 350°C - 550°C again for a minimum of 24 hours, until the crystal water in the structure of the refractory material evaporates.
• Bring the ambient temperature to 750°C with an increase of 30°C/hour.
• If steam release is still observed between 750°C - 950°C, keep it stable at the temperature where the release occurs. It can be waited for about 24 hours after the steam release is finished.
• In the final period between 1250°C - 1450°C (This temperature is variable and is 50°C above the operating temperature), it is required to wait for a minimum of 8 hours. After this final waiting, the environment can be taken into operation by lowering it to the operating temperature.
Notes:
The heat curing application is normally much more detailed than the schedule given above. Information such as burner size, gas outlet area, air volume, and flow rate must be known and evaluated. At this point, Kiltaş recommends that you contact experts regarding heat curing. During the heat curing application, the temperature on the refractory surface should be monitored from very many zones. If steam accumulation occurs in the environment during heat curing, the temperature should be stabilized, steam evacuation should be performed, and heating should be continued afterwards. If the heat curing application is interrupted for any reason, Kiltaş recommends starting the application from the very beginning. By using initiative, the system can be restarted, and after the system is reheated to the temperature where the interruption occurred and stabilized at this temperature for a certain period, the remaining process can be continued. However, as Kiltaş, we accept no responsibility for product degradation that may occur in this case.
Heat Curing for Insulating Concrete Refractories
Heat Curing for Insulating Concrete Refractories
The correct application of heat curing to insulating concrete refractories and the controlled removal of the water they contain are very important in terms of the refractory exhibiting full performance under operating conditions and its lifespan. The heat curing schedule for insulating concrete refractories is generally as follows:
• As a start to the heat curing application, raise the ambient temperature to 150°C with increases of approximately 25°C/hour.
• Wait between 150°C - 250°C for a minimum of 24 hours, provided that the temperature is not increased until its steam release is finished.
• Wait between 350°C - 550°C again for a minimum of 24 hours, until the crystal water in the structure of the refractory material evaporates.
• Bring the ambient temperature to 750°C with an increase of 30°C/hour.
• If steam release is still observed between 750°C - 950°C, keep it stable at the temperature where the release occurs. It can be waited for about 24 hours after the steam release is finished.
• In the final period at the operating temperature, it is required to wait for a minimum of 8 hours. After this final waiting, the environment can be taken into operation by lowering it to the operating temperature.
Notes:
The temperatures specified above are measured in the hot zone of the lining. Allow the lining to cool down naturally. In cooling, do not allow it to drop below a rate of 56°C/hour. The heat curing application is normally much more detailed than the schedule given above. Information such as burner size, gas outlet area, air volume, and flow rate must be known and evaluated. At this point, Kiltaş recommends that you contact experts regarding heat curing. During the heat curing application, the temperature on the refractory surface should be monitored from very many zones. If steam accumulation occurs in the environment during heat curing, the temperature should be stabilized, steam evacuation should be performed, and heating should be continued afterwards. Throughout the heating project, hot air should be distributed and its escape should be well ensured in order to expel the steam formed inside. If the heat curing application is interrupted for any reason, Kiltaş recommends starting the application from the very beginning. By using initiative, the system can be restarted, and after the system is reheated to the temperature where the interruption occurred and stabilized at this temperature for a certain period, the remaining process can be continued. However, as Kiltaş, we accept no responsibility for product degradation that may occur in this case.
