How to lay high alumina bricks?

High-alumina brick linings are divided into four categories according to the size of the brick joints and the fineness of operation. The categories and the size of the brick joints are as follows: first class ≤ 0.5mm; second class ≤ 1mm; third class ≤ 2mm; fourth class ≤ 3mm. The fire mud in the ash joints of the brick joints should be full, and the brick joints of the upper and lower layers and the inner and outer layers should be staggered. The preparation of refractory mortar for bricklaying should follow the following principles.

1. Before laying bricks, various refractory muds should be pre-tested and pre-laid to determine the bonding time, initial setting time, consistency and water consumption of different muds.

2. Use different utensils to prepare different muds and clean them in time.

3. Use clean water to prepare mud of different quality, accurately weigh the water, mix it evenly, and use it as needed. No water should be added to the prepared mud, and the initial setting mud should not be used continuously.

4. When mixing phosphate and mud, the specified trapping time should be guaranteed, and it should be mixing as needed. The prepared mud should not be diluted with water at will. Due to its corrosive nature, this slurry cannot come into direct contact with the metal shell. Before the brick lining is built, the site should be comprehensively inspected and cleaned up. Before the brick lining is built, the line work should be done well, and the size and elevation of the masonry should be checked according to the design drawings. The basic requirements for laying bricks are as follows: the bricks are closely attached to each other, the brick joints are straight, the circles are accurate, the bricks are locked firmly, the position is good, and the masonry should be kept flat and vertical. High-alumina bricks should be built with staggered joints, the mud in the joints of the masonry bricks should be full, the surface should be pointed, the joints should be horizontal and vertical, the arc surface should be smooth, and the masonry should be dense. According to the design plan, the variety layout of different high-alumina bricks is implemented. When laying bricks, the fullness of the fire mud should reach more than 95%, and the surface brick joints should be pointed with original mortar, but the excess mud on the surface of the brick lining should be scraped off in time.

When laying bricks, flexible tools such as wooden hammers, rubber hammers or hard plastic hammers should be used, steel hammers should not be used, bricks should not be chiseled on the masonry, and the masonry should not be knocked hard or corrected after the mud hardens. Bricks should be selected strictly, bricks of different materials and types should be strictly separated, and the length of homogeneous bricks should be uniform. The thickness of the seam steel plate is generally 1~1.2mm, and it is required to be flat, not curled, not twisted, and free of burrs. The width of each board should be about 10mm smaller than the width of the bricks. During masonry, the steel plate shall not exceed the edge of the brick, and the steel plate shall not be sounded or bridged. Only one steel plate is allowed per seam. Adjusting the narrow steel plate should be used as little as possible. Cardboard used for expansion joints should be placed as designed. When locking the bricks, use flat bricks to lock, finely process, and stagger the adjacent bricks by 1 to 2 bricks. It is strictly forbidden to use castable lock bricks alone, but the latter lock brick can be fixed with castables.

The composition and dosage of mud used for masonry of high alumina bricks.

High alumina brick refractory mud is made of refractory fine aggregate and binder, and it is made into mud of different consistency with liquid binder in a certain proportion. The refractory temperature and chemical composition of the masonry refractory product should be used.

The fire resistance of refractory products applies to the chemical composition. The prepared high alumina brick refractory mud should have certain room temperature bond strength, high temperature flexural resistance, shear strength, low temperature shrinkage, good air tightness and good construction performance.

The construction performance of masonry high alumina brick mud is mainly manifested in layability, spreadability, water loss and plasticity. Generally speaking, the water retention time of the mud is used to identify its construction performance. The so-called water retention time is to mix the mud into a suitable consistency and spread it on the brick surface with a trowel to a certain thickness. The time for moisture to be absorbed by the brick surface is generally 1 to 2 minutes. Too long or too short is not good for operation. After the mud is stirred, there should be no precipitation and segregation in a short period of time.

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