Regeneration of silica gel

During the use of silica gel, the adsorption capacity decreases due to the adsorption of water vapor or other organic substances in the medium, and it can be reused after regeneration.

(1) Regeneration after silica gel adsorption of water vapor.

(2) Regeneration after adsorption of organic impurities by silica gel.

(3) Problems that should be paid attention to in the regeneration of silica gel:

When drying and regenerating, attention should be paid to gradually increase the temperature, so as to avoid the explosion of silicon particles caused by severe drying and reduce the recovery rate.

When the silica gel is calcined and regenerated, too high temperature will cause the change of the pore structure of the silica gel, which will obviously reduce its adsorption effect and affect the use value. For blue gel indicator or color-changing silica gel, the temperature of desorption and regeneration should not exceed 120 °C, otherwise the color developing effect will be lost due to the gradual oxidation of the color developer. The regenerated silica gel should generally be sieved to remove fine particles to make the particles uniform.