Silica Gel Desiccant: What is it and How Does it Work?

Silica Gel Desiccant: What is it and How Does it Work?

Today's article will introduce a type of desiccant known as silica gel desiccant. So, what is silica gel desiccant, and what are the principles behind its main applications? Some may not be familiar with the answers to these questions, so this article compiles relevant information for a comprehensive understanding.

What is Silica Gel Desiccant?

Silica gel desiccant is a transparent or milky-white granular solid with an open porous structure, exhibiting strong adsorption capabilities for a variety of substances. Its applications are diverse, extending from specialized materials in aviation, advanced technology, and military sectors to widespread use across various sectors of the national economy. These sectors include construction, electronics, textiles, automotive, machinery, leather, papermaking, chemical, light industry, metal and paint, pharmaceuticals, and healthcare.

Principles Behind the Main Applications of Silica Gel Desiccant

Silica gel desiccant is primarily produced through the reaction of sodium silicate and sulfuric acid, followed by a series of post-treatment processes such as aging and acid bubbling. It is insoluble in water and any solvents, non-toxic, odorless, and chemically stable. With the exception of strong alkalis and hydrofluoric acid, it does not react with any substances.

Both its chemical and physical properties contribute to the excellent moisture absorption capabilities of silica gel. As a drying agent, its principle relies on the adsorption process to remove water molecules from damp substances. This occurs through the interaction of solid surface particles with water molecules in various gases and liquids, creating mutual attractive forces that cause the water molecules to be adsorbed onto the surface of the solid material. Such materials typically have numerous pores, providing a vast surface area.

Handling Used Silica Gel Desiccant

The characteristics of silica gel desiccant allow for its repeated use. To handle used silica gel desiccant, it can be returned to companies specializing in the recycling of desiccants. These companies have specific equipment for a processing workflow that enables the restoration of the moisture-absorbing capacity of silica gel desiccant. However, it's important to note that the moisture absorption rate of reused silica gel desiccant may not be as high as that of new material. Therefore, when purchasing silica gel desiccant, it is advisable to choose products from reputable manufacturers. Silica gel desiccants produced by reputable manufacturers use new materials, ensuring quality assurance. Only silica gel desiccants produced from new materials can meet the required moisture absorption rates.