The drying of magnesia adobe is to remove the physical water in the binder of the adobe, so as to improve the strength of the adobe and reduce waste products during brick laying and firing.
Magnesia bricks will undergo hydration during the drying process, which will increase the difficulty of operation. If the hydration is very serious, due to the expansion of the volume, network cracks will appear during the drying process.
During the drying process of the green body, the physical and chemical changes that occur include the two processes of water evaporation and magnesia hydration. The initial stage of water removal requires a higher temperature, but too high a temperature will accelerate the hydration of magnesia. Especially in the later stage of drying, because the influence of heat and moisture conduction is greater than that of moisture conduction, too high temperature is not conducive to the elimination of moisture.