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Study on properties of refractory materials
Refractory material refers to the refractoriness of not less than 1580 ℃, has good resistance to thermal shock and chemical erosion ability, low thermal conductivity and low expansion coefficient, inorganic non-metallic materials. It includes natural ores and various products made by certain processes according to certain purposes. At present, refractory materials generally refer to inorganic non-metallic materials used in metallurgy, petrochemical, cement, ceramics and other production equipment lining.
Refractory brick classification, what is breathable corundum brick?
For refractory bricks, some conditions of use are to use the high porosity and high air permeability of the product. At present, the steel mill widely used ladle bottom blowing argon breathable corundum brick, with gas blowing metal, that is, with gas blowing liquid with corundum brick. The use of the same particle size, the use of filler and binder in the sintering process to tightly bond the particles together, so that the product becomes a solid block, and the same size of the particle material determines the shape and size of the pores. If it is necessary to increase the breathability of the product, it is also necessary to add a burn-in additive whose particle size should be the same as the filler size, and the shape should be the same as it.
Application of Refractory Materials in Different Parts of Glass Furnace
The maximum temperature in the melting zone of the glass melting furnace is 1560°C to 1670°C. The safety limit generally depends on the softening point of the glass composition and the silica brick crown. The silica bricks begin to soften and melt at 1620°C. The reason why crowns are built with silica bricks instead of other refractory materials with higher refractoriness is that they have high strength at high temperatures and ablative materials are also compatible with glass, while other refractory materials may produce insoluble stone and other inclusions.
Common Refractory Materials and Selection Factors in Glass Furnace
Refractory glass is a broad concept, its literal meaning can be understood as a kind of glass with fire resistance. According to the different scope of use of refractory glass, it can be divided into building refractory glass: monolithic non-heat-insulating refractory glass, hollow refractory glass, heat-insulating refractory glass, etc. In addition to the refractory glass used in construction, it is used for The glass of various equipment high temperature observation windows: fireplaces, ovens, tin furnaces and other infrared heating equipment.
Progress of Refractory Materials for Glass Furnace
In recent years, the glass industry with high energy consumption and high pollution has been restricted by the national environmental protection policy. What is more worrying is that with the continuous expansion of glass production capacity, the relationship between the supply of glass products in the market is becoming more and more obvious. Many glass manufacturers are facing the pressure of declining market and declining profits. In order to change the current dilemma, it is necessary to do everything possible to reduce the operating cost of the glass kiln and reduce the pollution of the external environment in the glass production process. As a result, refractories for the traditional glass industry need to be able to better adapt to changes in glass furnace operating conditions. For example, in the process of changing from burning petroleum fuel to burning petroleum coke fuel, a large amount of S02, V205 and other impurities are introduced, and the erosion of refractory materials is intensified. Thus, it is necessary to take the corresponding kiln temperature increase, glass temperature rise, speed up the flow rate, strong scour the bottom of the pool, the pool wall refractory problem. For example, the glass kiln heat storage chamber is also widely used magnesium lattice brick, resulting in serious six valence Ming pollution problems. Therefore, the country may soon introduce mandatory regulations to restrict the use of magnesium refractory materials in the glass industry.
Development Trend of Refractory Materials for Glass Furnace
The development of refractories for glass furnaces in China will continue to focus on the life of glass furnaces, the quality and cost of glass products, energy consumption and environmental protection. In other words, the main problem faced by refractories for glass furnaces is the development of low-temperature melting. That is, with the application of glass furnace oxygen-enriched combustion, full oxygen combustion, arsenic-free material melting process and electric melting technology, will put forward higher requirements for refractory materials, especially cast refractory materials. The author believes that the development trend of refractory materials for glass furnaces in China should be shown in the following three aspects.
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