There are many methods of laying furnace bricks, which have a great impact on the quality of furnace bricks, and are generally evaluated through the following requirements:
a. Safety of operation
b. Correct and proficient installation
c. Time spent laying bricks
d. Handleability (flexibility) of bricklaying equipment
Several methods of furnace brick masonry and key points of masonry
A. According to the use of cement or not, brick laying can be divided into dry laying method and wet laying method.
1. Wet laying method is mainly used for clay bricks and high alumina bricks. When the high-alumina brick is wet laid, the refractoriness of the kiln brick and the refractory clay must be relatively close, otherwise, the kiln brick will not be worn during operation, but the refractory clay will be gone, so the brick will be easily dropped. The refractory mud should be spread evenly.
2. The dry laying method is mainly used for dolomite bricks and magnesia-chromium refractory bricks, mainly because these two kinds of bricks are easily affected by moisture and their quality.
B. According to the arrangement of bricks, it can be divided into two types: horizontal circular laying method and vertical staggered laying method.
1. At present, the vertical staggered masonry method is rarely used. Although its overall strength is better than that of calibration, the connection between them is relatively close, but when a problem occurs, a small point failure may cause a larger surface damage.
2. The horizontal ring laying method can be divided into two kinds of laying methods: the two adjacent brick circles are sewn into a straight line and the brick seams are staggered. When the bricks are sewn into a straight line, the brick seams are not in a straight line due to the deviation of the size of the bricks or the bricklaying.
C. According to the different methods of laying furnace bricks, it can be divided into rotating method, fixed method and adhesive method.
1. At present, the rotary method is only used for some small kilns. For large kilns, there is a huge pressure when supporting the kiln, which will deform the kiln shell. The kiln support is bulky and inconvenient to carry and support. The larger the kiln diameter, the greater the force the kiln support bears, which is prone to danger and the speed of brick laying is relatively slow.
2. Adhesive method, no auxiliary tools are needed, and the brick laying speed is fast. But the gluing method is mainly difficult to ensure the quality of kiln bricks, and there is no way to determine whether the brick laying circle is firm. It is difficult to deal with finishing bricks and unevenness. Before laying bricks, the kiln is required to be very clean, otherwise the effect of viscose bonding will be affected.
3. Fixed method: The lower half of the kiln shell is built manually, and the upper half of the kiln shell is fixed by a bricklaying machine. There is no need to turn the kiln during the bricklaying process. Bricks can be laid anywhere in the section of the kiln, and the bricklaying machine is inside the kiln. It is very convenient to move. Bricklaying is fast, efficient and safe to operate.
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