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After silica gel absorbing moisture, the moisture can be removed through
thermal desorption . The heating methods are various, such as
electrothermal furnace , flue waste heat heating and hot air drying,
The temperature of desorption heating is controlled between 120 ℃ and 180 ℃ . For blue gel indicator, allochroic silica gel and DL type blue silica gel, the temperature should be controlled between 100 ℃ and 120 ℃. During the regeneration of industrial silica gel of various kinds, the maximum temperature should not be higher than below limit:
For coarse-pored silica gel, it should not be higher than 600 ℃;
For fined-pored silica gel, it should not be higher than 200 ℃ ;
For blue gel indicator (or allochroic silica gel), it should not be higher than 120 ℃ ;
For alumino silica gel, it should not be higher than 350 ℃ .
For silica gel after being regenerated, its moisture should be controlled below 2% for repeated operation.