Refractory bricks play a vital role in high-temperature industries, and their performance and life directly affect the operating efficiency and safety of industrial equipment. In order to ensure the long-term and stable operation of refractory bricks, regular repair and maintenance are essential. This article will discuss in detail the repair and maintenance methods, common problems and solutions of refractory bricks.

1. Common problems of refractory bricks
Cracks and spalling:
Refractory bricks are used for a long time in high-temperature environments, and are prone to cracks and spalling caused by thermal stress. This phenomenon is common in furnace walls and furnace roofs, and in severe cases it will affect the sealing and thermal insulation properties of the furnace body.

Erosion and wear:
Chemical erosion and mechanical wear are one of the main causes of refractory brick damage. The chemical erosion of refractory bricks by high-temperature molten materials and slag, as well as the impact and friction of materials on the furnace lining, will cause wear and thinning of refractory bricks.

High-temperature deformation:
Under long-term high temperature, refractory bricks may undergo high-temperature deformation, resulting in unstable furnace lining structure and affecting the normal operation of the equipment.

2. Maintenance measures for refractory bricks
Regular inspection:
Inspect the inside of the furnace body regularly, especially when the equipment is shut down for maintenance, check the surface condition of the refractory bricks, and find cracks, peeling, erosion and other problems in time.

Keep clean:
Keep the inside of the furnace body clean, remove dust and debris in time, and prevent impurities from further erosion and wear of refractory bricks.

Temperature control:
During operation, strictly control the changes in furnace temperature to avoid damage to refractory bricks caused by thermal stress caused by excessive temperature fluctuations.

Timely repair:
Repair the cracks and peeling areas found in time. Refractory repair materials can be used for repair to ensure the integrity and sealing of the furnace lining.

3. Maintenance methods for refractory bricks
Crack repair:
For small cracks, refractory mud or repair materials can be used to fill them. First, clean the loose parts of the cracks, then fill them with repair materials, and compact them flat. For larger cracks or peeling areas, partial replacement is required to ensure that the repaired bricks are tightly combined with the surrounding bricks.

Replace worn bricks:
When refractory bricks are severely worn and thinned, they should be replaced in time. When replacing, you need to clean the debris around the damaged bricks first, then carefully remove the damaged bricks and replace them with new refractory bricks to ensure that the new bricks are tightly combined with the original structure.

High temperature treatment:
For refractory bricks that are deformed at high temperature, high temperature treatment can be used for repair. By heating the deformed area, it is restored to its original state. This method is suitable for refractory bricks with slight deformation.

4. Common problems and solutions
Refractory bricks fall off:

Reason: Ineffective adhesive, weak bonding between the brick body and the substrate.
Solution: Select appropriate high-temperature adhesive to ensure the close bonding between the brick body and the substrate during construction. Clean the substrate surface before construction to ensure effective adhesion of the adhesive.
Brick cracking:

Reason: Rapid temperature change and excessive mechanical stress.
Solution: Optimize the operating procedures to avoid rapid temperature changes. For areas with greater mechanical stress, refractory bricks with better thermal shock resistance can be used.
Chemical erosion:

Reason: Chemical reaction between high-temperature molten materials and slag.
Solution: Choose refractory brick materials with better chemical stability, and regularly clean the molten materials and slag in the furnace to reduce the occurrence of chemical erosion.
5. Service life management of refractory bricks
Life prediction:
According to the use and working environment of refractory bricks, regularly predict and evaluate the life, and make replacement plans in advance.

Data recording:
Establish archives of the use of refractory bricks, record detailed information of each inspection, repair and replacement, so as to analyze the damage patterns and causes of refractory bricks and optimize maintenance measures.

Technical training:
Provide professional technical training for operators and maintenance personnel to improve their understanding and skills of refractory brick maintenance and ensure the standardization and scientific maintenance of maintenance work.

Conclusion
Refractory bricks play a vital protective role in high-temperature industrial equipment, and their repair and maintenance work is directly related to the operating efficiency and safety of the equipment. Through regular inspections, timely repairs and scientific maintenance measures, the service life of refractory bricks can be effectively extended and the overall performance of the equipment can be improved. With the continuous advancement of technology, the application of new refractory materials will further improve the performance of refractory bricks and provide a more solid guarantee for the development of high-temperature industries.