Refractory bricks are essential materials for industrial kilns. They are generally composed of refractory firebricks. Qualified refractories bricks are generally used for a long time in industrial kilns. However, due to the influence of external conditions, some fire bricks may be partially damaged. In this case, we need to maintain and repair these bricks. Generally, we know that refractory firebricks produced by industrial kilns mainly refer to the repair of magnesia-chrome bricks and spinel bricks.
The following will introduce to you the matters that need to be paid attention to when repairing bricks:
1. The bricks used for the patching must be from the same manufacturer and the same batch as the old bricks;
2. Use the remaining loose bricks from the same maintenance as the old bricks as much as possible (Note: Bricks that are damp or damaged are strictly prohibited);
3. The contact surface of the new and old bricks must be mortared;
4. No iron plate can be placed between the interface surfaces of the new and old refractory bricks;
5. No iron plate can be placed on the brick seams on both sides of the lock bricks. The iron plates of the two adjacent rings of bricks must be staggered, and no iron plate can be placed on both sides of the same brick;
6. The iron plate must be completely inserted into the brick seams;
7. The sealing of the first few rings of bricks must be inserted from the side, and the last ring of bricks must be sealed with bricks inserted from the front;
8. Masonry must be carried out strictly in accordance with the designed brick ratio, and the masonry ratio must not be changed at will;
9. The expansion joint cardboard of the patching bricks must not be Tear off, the bricks must be wet-laid (the fullness of the fire mud slurry should reach more than 95%. It is strictly forbidden to have no fire mud on the big head of the brick and fire mud on the small head. If this happens, it should be removed and re-laid in time;
10. Try not to use (or reduce the use of) processed bricks when patching.
Principles of patching refractory bricks
Bricks should be opened from the weakest part of the brick, but no more than three rings of bricks can be dug at the same time. If it is a continuous multi-ring patching, in order to prevent the brick from loosening as a whole, it is necessary to patch 2 rings before continuing to patch backwards. When digging bricks, pay attention to the tightness of the whole ring of bricks. If the bricks are loose as a whole, stop digging immediately, and use the brick locking iron plate to tighten the ring seams on both sides of the loose bricks. After tightening, confirm that they are not loose before continuing the patching operation.
