The properties and preparation methods of silica gel desiccant need to be studied urgently.

The main component of silica gel desiccant is silica, which is a neutral substance. It is not easy to react with other substances except hydrofluoric acid, and it is non-toxic and harmless. It is the only desiccant that can be used for food and medicine. Other physical and chemical properties are ok if you go to encyclopedia. Let me briefly answer the preparation method:

1. Raw material preparation: dilute sodium silicate (water glass) solution and concentrated sulfuric acid solution as required.

2. Introduce the prepared sodium silicate solution and barium sulfate into the reactor with an air compressor, and then spray it from the nozzle. The height of free fall is about 4 meters, during which the reacted liquid quickly forms hydrogel due to air tension.

3. The hydrogel falls freely into a container filled with prepared dilute sulfuric acid, and then enters a container filled with a certain concentration of dilute sulfuric acid through a conveyor belt for "acid bubble". After a period of time, the liquid in the tank is drained after the PH value of the "acid bubble end point" is qualified.

4. Inject the water treated by the "reverse osmosis device" into the tank and repeatedly "wash with water". After a period of time, measure the liquid PH value and colloid PH value of the "washing end point", and enter the drying procedure after meeting the requirements.

5. Dry with a drying device (generally using the cooling fin of the device and the drying chamber heated by steam), and enter the screening procedure after determining that the water content of silica gel meets the requirements.

6. Sieve the silica gel through different vibrating screens according to the particle size.

7. packaging