RECOMMENDATIONS FOR DRYING MONOLITHIC PRODUCTS

The elimination of water from the refractory material must be progressive and carried out at a controlled speed determined by the characteristics of the product, the quantity, the thickness and the thermal profile of the lining to be dried.

The elimination of water is done through its transformation into steam. This transformation causes a considerable increase in volume, which generates high pressures inside the refractory.

When the steam pressure inside the refractory is higher than the internal cohesion force of the same, there is a heating and/or explosion and/or spalling of the same, if not carried out optimally. In addition, the material obtained may present defects (cracks).

The drying curve is a basic and fundamental tool for the elimination of water from the refractory material and the subsequent correct formation of its characteristics. It is a complex operation that must be carried out following the manufacturer's recommendations to the letter.


The drying procedure is determined on the basis of the characteristics of the face layer material. If different products have been used, the slowest drying rules should be imposed.
Temperature control is the key to successful drying.
Once the drying phase is complete, the coating is in optimum condition to receive molten metal or to be put to work. Under no circumstances should the furnace be cooled, as the thermal stresses to which the refractory is subjected may result in a reduced life or duration of the lining.

OBSERVATIONS:
Follow the drying curve marked by the manufacturer.
Precise temperature measurement is essential; if necessary at several points.
Measure the temperature of the furnace chamber.
Use appropriate thermocouples for the drying curve.
If necessary, insert water vapour pressure se