1. When drying and regenerating, attention should be paid to gradually increase the temperature so as not to cause severe cracking of the colloidal particles and reduce the recovery rate.
2. When roasting and regenerating silica gel, high temperature will cause changes in the pore structure of the silica gel and significantly reduce its adsorption effect, affecting the use value. For blue plastic indicator or discolored silica gel, the desorption regeneration temperature should not exceed 120 °C, otherwise it will lose color because of the gradual oxidation of the color reagent.
3. The regenerated silica gel should generally be sieved to remove fine particles to make the particles uniform.