Special firebrick for roaster flame path wall and preparation method thereof

Abstract

The invention provides a special firebrick for a roaster flame path wall and a preparation method thereof. The firebrick consists of the following components: Al2O3, Fe2O3, CaO+MgO, Na2O+K2O, ZrO2, SiC+SiO2 and impurities. The firebrick provided by the invention can meet the requirement of domestic roaster flame path wall on the firebrick, the use effect of the firebrick can reach the same level as those of foreign firebricks, and the effects of the firebrick are more excellent in certain aspects. Especially, various properties of the firebrick product can be regulated by regulating the contents of various components so as to meet the demands of different application occasions. By using the firebrick produced by the technical scheme of the invention, the firebrick has the advantages of high temperature resistance, low creep property, good stability and stable linear variation as well as good earthquake resistant capability and toughness.

Description

technical field [0001] The invention relates to a refractory brick, in particular to a refractory brick applied to a melting furnace. Background technique [0002] The melting furnace is the most critical large-scale thermal furnace equipment for the production of carbon products. Over the years, there have been many problems in the use of the masonry of the flue wall of the roasting furnace: the service life is short for 2-3 years; during the baking time, there are sags and distortions, and the sag reaches 60-150mm: masonry brick joints Too much, the linear shrinkage of the masonry material is uneven: the formation of local defects and the tension cause the overall deformation of the flue wall, and even sudden damage. Large heat loss; serious pollution; poor operating conditions. The existence of these problems fully shows that there are many problems in the lining materials, masonry structure and masonry technology. [0003] At present, the way domestic enterprises solv...

AI Technical Summary

Problems solved by technology

Over the years, there have been many problems in the use of the masonry of the flue wall of the roasting furnace: the service life is short for 2-3 years; during the baking time, there are sags and distortions, and the sag reaches 60-150mm: masonry brick joints Excessive, uneven linear shrinkage of masonry materials: the formation of local defects and the protection of tension cause the overall deformation of the flue wall, and even sudden damage

But it doesn't take long for similar problems to reappear

At the same time, other problems will also occur when replacing the refractory bricks of the flue wall; for example: 1. It will destroy the process connection between the previously designed roasting furnace flue walls

2. It will affect the overall service life of the roaster

3. Since the replacement of the refractory bricks of the flue wall is different from the refractory bricks used in the previous masonry, the overall heating environment of the entire roasting furnace will be uneven, and the mechanical structure of the refractory bricks will be damaged. The cracks in the flue wall are serious, resulting in air leakage Leakage will affect product quality and increase heat loss. The more severely damaged flue wall must be repaired or overhauled. Since the flue wall is made of small refractory bricks, it takes about 7~ 8 hours, it takes about 24 hours to rebuild the masonry

To dismantle and rebuild a fire wall, nearly 17 tons of materials must be moved, which not only brings difficulties to the furnace repair work, but also increases the difficulty of normal production in the workshop

In particular, the roasting furnace operates in a cyclical manner, and the time left for maintenance, demolition, and rebuilding of the flue wall is very tight. Usually, planing repairs must be started when the furnace temperature is still 80°C to 90°C. The working environment is extremely harsh. In turn, it will affect the construction quality, forming a vicious circle

4. Waste of resources and increase the production cost of enterprises

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