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What is Precipitated silica？

November 29, 2024
silica
Precipitated Speciality Silica is a form of silica (silicon dioxide, SiO₂) that is produced through a chemical process where soluble silicates are precipitated to form a fine white powder. It is widely used in various industrial applications due to its unique properties, such as high surface area, porosity, and ability to absorb moisture and oil. Below is a detailed overview of precipitated silica, its production, properties, and applications.
 
Production of Precipitated Silica
Source of Silica:
Precipitated silica is typically produced from sodium silicate, which is derived from quartz sand.
 
Process:
The most common method for producing precipitated Fumed Silica involves the addition of an acid (often sulfuric acid) to a sodium silicate solution. This process creates a gel-like precipitate of silica, which is then washed, filtered, and dried.
The resulting product is then processed to achieve specific particle sizes and surface areas, depending on the intended application.
 
Key Properties of Precipitated Silica
High Surface Area:
Precipitated silica typically has a high surface area (150 m²/g to 400 m²/g or more), which enhances its ability to adsorb liquids and gases.
 
Porosity:
Its porous nature allows it to hold moisture and oil, making it an effective desiccant and thickening agent.
 
Particle Size and Distribution:
The average particle size can vary from 7 to 20 micrometers, and the distribution can be tailored based on processing to suit specific applications.
 
Chemical Inertness:
Precipitated silica is chemically stable and does not react with most chemicals, making it suitable for use in a variety of formulations.
 
Lightweight:
It is a low-density material, which is advantageous in applications requiring lightweight additives.
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Mr. Wen Yuan

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