What causes high alumina refractory bricks to return to alkali and become frosty? What are the prevention and solution measures?
High alumina refractory bricks are mainly composed of alumina and silica, and the two will affect the performance of the brick in different proportions. If the alumina content is too high, the glass phase content in the brick will increase, and crystals will easily precipitate under high temperatures, forming hoarfrost. In addition, excessive impurity content in the brick body will also adversely affect its performance.
What causes high alumina refractory bricks to return to alkali and become frosty?
1. Humidity and temperature
During the use of high-alumina refractory bricks, if the ambient humidity and temperature are too high, excessive moisture will be absorbed on the surface. This kind of moisture adsorption will cause the brick body to be susceptible to chemical corrosion, which will lead to the phenomenon of alkaline return and white frost.
2. Atmosphere influence
If there is a reducing atmosphere in the environment where high alumina refractory bricks are located, such as hydrogen, carbon monoxide, etc., these gases will react with the components in the brick at high temperatures. This reduction reaction causes a white deposit to form on the brick surface.
3. Installation problems
If the high-alumina refractory bricks have gaps or are not installed tightly during installation, this will cause them to be washed away by high-temperature gases during subsequent use, making them more susceptible to corrosion.
4. Improper operation
During use, if the operation is improper or the equipment maintenance is not timely, such as air leakage, material leakage and other problems, these factors will cause the high alumina refractory bricks to be chemically corroded, thereby forming hoarfrost.
What measures can be taken to prevent high alumina bricks from returning to alkali and causing white frost?
1. Select appropriate high-alumina refractory bricks
When purchasing high-alumina refractory bricks, you should choose products with stable quality and reasonable ingredients to avoid the problem of alkali return and white frost during use. At the same time, it is necessary to select suitable high-alumina refractory bricks according to the actual use environment to ensure that their composition matches the actual use needs to give full play to their fire-resistant performance and stability.
2. Control the usage environment
When using high-alumina refractory bricks, the ambient humidity and temperature should be controlled to avoid adverse effects from excessively high or low environmental conditions. At the same time, it is necessary to ensure that there is no reducing atmosphere in the use environment to reduce the risk of corrosion of the bricks. By taking these measures, the service life of high-alumina refractory bricks can be extended and their stability and fire-resistant performance can be ensured.
3. Standardize installation and use operations
When installing high alumina refractory bricks, ensure tight installation and no gaps to avoid uneven heating and corrosion problems of the bricks caused by air flow. At the same time, during use, the operation and maintenance behavior must be standardized to avoid the problem of alkaline return and white frost caused by improper operation or untimely equipment maintenance. Through correct installation and use, the service life of high-alumina refractory bricks can be extended and their fire-resistant performance and stability can be ensured.
4. Regular inspection and maintenance
Regular inspection and maintenance of high-alumina refractory bricks are important measures to prevent their return to alkali and whitening. Through regular inspections, problems with the bricks can be discovered in time and corresponding measures can be taken to solve them, thereby avoiding more serious consequences caused by the worsening of the problems. At the same time, corroded bricks must be cleaned and replaced regularly to ensure the normal operation and production efficiency of the equipment. Through these measures, the service life of high-alumina refractory bricks can be extended and their stability and fire-resistant performance can be ensured.
