When the furnace top is flat, the lining of the furnace roof is generally cast directly with low cement castables and supported by anchor bricks.
However, some low-water castables may have particles skewed to the west due to the particle ratio of the process or excessive water addition during construction or during the mixing process, causing the refractory castables to peel off. At this time, in order not to delay production for too long, it is possible to use spraying for emergency repair, or use refractory plastic castables to repair.
1. The uses and effects of both
If the damaged area of the stove top is too deep, delamination will occur due to the thickness of the spray paint being too thick. In this case, plastic refractory can be used to repair the stove top, because after the stove top is repaired with plastic, the stove top will be repaired flat. In addition, because the plastic is combined with phosphoric acid, as the temperature increases during use, it will combine better with the old furnace top lining.
However, if the damage to the entire furnace top is too serious, it is possible to replace the entire furnace top or spray the entire furnace top. If the original castable has fallen into large pits and deep pits, it is better to use plastic to repair it.
2. The difference between the two
The difference between spray repair and plastic castables repair is that spray construction is faster, while plastic repair construction is relatively slower. Because the spray paint is sprayed with a professional sprayer, the construction is fast and the adhesion is strong. However, spray paint has a certain percentage of rebound rate, but there is no loss of plastic. It is manually beaten with a leather hammer. The service life will be relatively longer than that of spray paint.
3. The top of the heating furnace can be repaired with plastic
Generally speaking, the top of the heating furnace is mostly repaired with plastic, but if the furnace has a flat top, it can be repaired with plastic. With the emergence and development of new technologies, the use of special binders for spray paint is also effective. In addition, the construction is less labor intensive than plastic castables.
In short, plastic can be used for small batches, and spray paint can be used for large batches. The cost of spraying with too little amount will be high, while the plastic construction period will be longer than that of spray paint, but the construction cost is relatively low.
