Percipitated Silica
A fine powder widely used in rubber, cosmetics, and as a thickening agent.
Step 1: Precipitation
Sodium silicate solution (water glass) and mineral acid are reacted in an agitated vessel to produce a slurry of amorphous silica particles. The critical physical properties of precipitated silica, such as particle size and porosity, are controlled during this stage of the process by manipulating, among other things, the composition, concentration, and ratio of reactants in the precipitating solution; the speed of agitation; the reaction time; and the reaction temperature.
Step 2: Washing
The precipitated silica slurry is then concentrated to form a filter cake. The product filter cake is washed to remove the salt by product that is produced during precipitation.
Step 3: Drying
The silica filter cake is then dried to the desired final product moisture content.
Step 4: Finishing and packaging
The dried silica is then finished to achieve the desired final product form. This can include: agglomeration or compaction into a low-dust form, or milling and classification to the required particle size distribution. The final product is packaged for shipment in small bags, big bags, or bulk trucks or railcars.
We are manufacturing precipitated silica for customers in the following industries.
