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The refractory configuration of the furnace lining cupola lining has been described above. For details, please refer to the working environment and configuration of refractory materials for the furnace lining cupola. So far, the furnace lining cupola is mainly made of ordinary acid or alkaline refractory bricks. There are also many cupolas made of red silica brick, white foam brick, limestone brick, dolomite brick, and some cupolas using red silica powder. , white foam powder beaten. The use of ordinary acid or alkaline refractory bricks and other special bricks as the main material to build cupolas should be carried out in accordance with the following procedures and requirements.
(1) Furnace confirmation and cleaning
Before the new cupola is repaired for the first time, the diameter of the shell of the cupola and the height of the shell should be confirmed. The complete lining construction plan should be determined according to the lining design.
The cupola being used must be repaired after the furnace wall is cooled, and a safety cover and warning signs are placed at the feeding port before the furnace is repaired. Firstly, the metal charge left in the throat or other parts of the cupola feed, the large slag suspended in the furnace wall, and the loose refractory bricks are knocked down to prevent the falling objects from injuring people. When removing the stagnant metal charge, the slag suspended on the furnace wall, and the loose refractory bricks, avoid strong tapping perpendicular to the furnace wall to prevent the intact part of the lining. When the furnace is repaired, if the wall erosion depth exceeds 2/3 of the brick thickness or the refractory brick is broken or loose, the new brick should be replaced.
(2) Masonry furnace
The furnace includes a cupola (or post-furnace) furnace and a forehearth furnace. When the furnace is built with refractory bricks, it is generally built from the bottom to the top. The mud between the refractory bricks is required to be full, and the bricks and bricks are tightly combined. The upper and lower, inner and outer bricks are staggered, and the brick joints are not more than 2 mm. The composition of the cement must be compatible with the composition of the refractory brick and the moisture content is appropriate. The clay used in general acid furnace bricks can be configured according to Table 1.
When the new cupola or furnace lining is overhauled, the furnace shall be built with a brick wall of about 1000mm from bottom to top. A brick ring shall be set up; the brick ring shall be firmly welded on the furnace shell to ensure the average force of the furnace shell.
The parts of the furnace that cannot be built with refractory bricks are built or repaired with tanning materials. Before using the material to build or repair, first remove the slag, iron slag and other debris attached to the furnace wall, and at the same time apply muddy water on the furnace wall, and then repair or build the furnace with layering materials. The hammer is firm. The ingredients of the dip should conform to the nature of the lining, and the moisture should be based on the weight of the hand. The moisture content of the mash should not be too high. Table 1 lists the ratios of the materials commonly used in the construction of cupolas and furnaces for reference.
The coke powder and graphite powder contained in the paint and the paint used in the repairing of the furnace can improve the slag resistance and the penetration resistance of the refractory material. Among them, 35% of the light refractory brick powder is used in the cupola material 2, and the material is used for the parts of the cupola that need to be insulated, such as the preheating section of the cupola and the outer layer of the furnace. The furnace materials and coatings can be self-configured according to Table 1. The moisture in the distribution should be minimized under the premise of ensuring the performance of the coating and coating.
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