2025-02-25 09:22:24
Aluminum silicate fiberboard anti-erosion treatment method Aluminum silicate fiberboard is a high temperature, wind corrosion and thermal shock resistance material, which is widely used in cement, ceramics, petrochemical and other fields. However, it may be eroded by some chemicals, such as fluorine, fluoride, vanadium and other heavy metals, phosphoric acid, strong alkalis, etc. Here are some anti-erosion treatment methods for these aggressive chemicals: Prevent fluorine and fluoride from erosion. Fluorine and fluoride are very corrosive to aluminum silicate fibers, especially below 100°C, fluorine and water and aluminum silicate. The reaction of fibers will cause great damage to the fiber structure. To prevent this erosion, anti-fluorine agents can be added during the production process, or the aluminum silicate fiberboard can be prevented from contacting substances containing fluorine during use. In addition, a fluorine-resistant coating can be applied to the surface of the aluminum silicate fiberboard to reduce the erosion of fluorine and fluoride. Prevent vanadium and other heavy metals from erosion Vanadium and other heavy metals present in inferior fuels will erode the aluminum silicate fibers when burned. This corrosive substance comes from vanadium pentoxide (V203), which melts at about 690°C and reacts with aluminum silicate in the fibers. To prevent this erosion, low vanadium or vanadium-free fuels can be used, or a metal-resistant coating may be coated on the surface of the aluminum silicate fiberboard. Prevent sulfur and sulfuric acid corrosion Although aluminum silicate fibers have good resistance to sulfuric acid corrosion, they can also produce some minor chemical reactions in rare cases. For example, in the case where iron (Fe) and sulfuric acid (H2S04) coexist, an iron oxide-alumina-silica-silica composite sulfate will be produced, which will dissolve the rivet and the furnace shell. To prevent this erosion, asphalt coating or stainless steel film can be used to protect the metal rivet firmware, or to ensure that the temperature at which the metal rivet firmware is higher than the dew point temperature of sulfuric acid, generally 121~177℃12. Prevent alkali corrosion The corrosion of alkali on aluminum silicate fibers is believed to depend mainly on two factors: time and temperature. The alkali metal reacts with the fiber to form a low melting compound, causing the fiber to shrink or sinter, which ultimately leads to damage to the fiber liner. To prevent this erosion, the alkali content in the use environment can be controlled or a layer of alkali-resistant coating can be applied to the surface of the aluminum silicate fiberboard. Preventing other acids from erosion of aluminum silicate fibers are generally considered to have good resistance to hydrochloric acid (HCl), acetic acid (CH3COOH) and nitric acid, but may still be eroded by phosphoric acid at low temperatures. To prevent this erosion, the aluminum silicate fiberboard can be prevented from contacting these acidic substances, or an acid-resistant coating can be applied to the surface. Through the above method, the corrosion resistance of aluminum silicate fiberboard can be effectively improved and its service life can be extended.
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