Glass melting furnaces use various high-tech composite sealing refractory materials to make glass melting furnaces "sealed". This not only ensures the safe use of the melting furnace, but also avoids the occurrence of furnace accidents, greatly extending the service life of the melting furnace. Various high-tech composite sealing refractory series for glass melting furnaces have been widely promoted and applied in glass industry furnaces. The sealing of the large crown, pool bottom and pool wall must adopt a multi-layer sealing structure to make the glass melting furnace "sealed". This not only ensures the safe use of the melting furnace, but also avoids the occurrence of furnace accidents, greatly extending the service life of the melting furnace, and due to the implementation of sealing and enhanced insulation, the melting process is greatly improved. Therefore, sealing the furnace is a major structural improvement of the glass melting furnace.
Silica sealing refractory series for crown top
The high-tech composite sealing refractory series for glass melting furnaces mainly includes: silica sealing refractory series for crown top, and electric fused zirconium corundum sealing refractory series for pool bottom and pool wall. Both types of materials are typical high-tech multiphase composite sealing refractory materials, which have dynamic characteristics that are difficult to see in other composite materials.
Silica sealing refractory materials are an important new type of refractory materials widely used in glass kilns. The sealing of the melting furnace arch is achieved through the sealing mud used for masonry of the arch, the dry sealing powder used to treat cracks in the kiln baking process, and the sealing layer material laid on the top of the silica brick arch.
Silica sealing refractory series is a modern high-tech multiphase composite material, which is composed of six phases: aggregate, ceramic binder, dispersion medium phase, modified external phase, chemical addition phase and water. The use of SiO2 ceramic binder puts forward many special requirements, which significantly improves the technical performance indicators of silica sealing refractory materials. The refractoriness of the sealing masonry mud and the sealing layer material is as high as 1750℃, and the load softening point is 1710℃. These two high-temperature performance indicators are 40℃-50℃ higher than those of high-silicon high-quality fire clay and large arch bricks, respectively. This is a major progress in the research of siliceous refractory materials at home and abroad.
At room temperature, low temperature, medium temperature and high temperature, it has a particularly high bonding strength, which is another important reason for the successful use of this high-tech composite sealing material in the large arch of the melting furnace. The bonding strength at room temperature can ensure that the masonry arch bricks will not be drawn and sink after the arch tire is removed; at low temperature, after being dried at 110℃, the cold flexural strength is more than 5 times higher than other high-quality muds, reaching 4MPa; the improvement and enhancement of strength at medium temperature (800℃-1000℃) is one of the main characteristics of the ceramic binder comprehensive system of this composite sealing material; at high temperature, due to the good sintering effect, the large arch has an overall structural strength.
Electrofused zirconium corundum sealing refractory series for pool bottom and pool wall
With the substantial increase in melting temperature and output of glass production, the strengthening of heat preservation requires the extension of furnace life, and the adoption of electric melting and bubbling technology, strict and effective sealing of the melting furnace is an important development trend of modern glass melting furnaces, especially the pool bottom and pool wall that are in direct contact with glass.
Electric fused zirconium corundum sealing refractory series for pool bottom and pool wall is a castable modern sealing material prepared by using electrofused zirconium corundum as raw material, combining with a new generation of ceramic binder, adding dispersed phase, modified added phase, and chemical added phase. It is mainly used for the high-tech composite sealing refractory series of glass melting furnace pool bottom, pool wall, small furnace, etc., which is matched with electrofused zirconium corundum bricks. It has good glass erosion resistance, which is the key to ensure the safe operation of the melting furnace. It is not comparable to general traditional materials. The erosion resistance index is 0.6 times that of electrofused zirconium corundum bricks, and more than doubled that of phosphate-bonded AZS sealing ramming material. Its excellent corrosion resistance is due to the fact that it uses fused zirconium corundum as the main raw material, which has almost no pores and is composed of mineral phases such as corundum, mullite, and baddeleyite with strong corrosion resistance. On the other hand, this new type of sealing castable forms a fine capillary-shaped, dense, corrosion-resistant organizational structure as a result of the high-dispersion ceramic binder and colloidal particles filling the gaps in the sealing material after molding, which greatly improves the material's damage resistance. It has been used in the actual sealing of the bottom and wall of the melting furnace, and has achieved outstanding use results and successful sealing experience.
The high-tech composite sealing refractory series for glass melting furnaces are all based on the viewpoint of composite materials. The composition, function and role of each component phase, as well as the dynamic reaction between them, have been studied, thereby determining the production method, technical route, and process theoretical basis of this new type of sealing refractory material, and successfully developing a modern high-tech dynamic composite sealing material series, adding new varieties to the refractory industry.
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