Refractory bricks have brought people a guarantee of safety in the field of safety, but at the same time, some refractory bricks will be partially damaged due to the influence of external conditions. Then we need to maintain and repair these refractory bricks. Generally we know that the refractory bricks produced by industrial kilns mainly refer to the excavation and repair of magnesia-chrome bricks and spinel bricks. The following is an introduction to the matters needing attention in repairing bricks: burnt magnesia bricks

1. The bricks must be made of the same batch of bricks from the same manufacturer as the old bricks;

2. As far as possible, use the remaining loose bricks repaired at the same time as the old bricks (note: bricks that are damp or damaged are strictly prohibited)

3. The contact surface of new and old bricks must be fired mud;

4. No iron plate can be struck between the new and old brick interface surfaces;

5. The joints between the two sides of the lock brick can not be ironed, the iron plates of two adjacent ring bricks should be staggered, and the two sides of the same brick cannot be ironed;

6. The iron plate must be completely driven into the brick gap;

7. The sealing of the first few rings of bricks must be inserted from the side, and the last ring of bricks should be sealed with front inserts;

8. Carry out masonry in strict accordance with the design brick ratio, and do not change the masonry ratio at will;

9. The cardboard for the expansion joints of the dug bricks must not be torn off, and the dug bricks must be wet-laid (the fullness of the fire mud should be more than 95%. It is strictly forbidden that the big end of the brick has no fire mud and the small end has fire mud. If this happens, it should be Dismantle and rebuild in time;

10. Do not use (or reduce the use) of processed bricks when digging and repairing.

The principle of digging and repairing: dig bricks from the weakest part of the bricks, but you cannot dig more than three rings at the same time. If it is continuous multi-ring digging and repairing, in order to prevent the bricks from loosening as a whole, you must dig and repair 2 rings before continuing to dig and repair. When digging bricks, pay attention to the tightness of the whole ring of bricks. If the bricks are loose as a whole, stop digging and patching immediately. Use a brick-locking iron plate to insert the ring seams on both sides of the loose bricks. After tightening, make sure that they are not loose before continuing the digging and patching operation.