Precipitated Silica

Precipitated Silica is a form of silica produced by precipitation.

Precipitated Silica Production

Precipitated silica is a form of silica produced by precipitation. 

The production of precipitated silica starts with the reaction of an alkaline silicate solution with a mineral acid.  Sulfuric acid and sodium silicate solutions are added simultaneously with agitation to water.  Precipitation is carried out under alkaline conditions.  The choice of agitation, duration of precipitation, the addition rate of reactants, their temperature and concentration, and pH can vary the properties of the silica. The formation of a gel stage is avoided by stirring at elevated temperatures.  The resulting white precipitate is filtered, washed and dried in the manufacturing process.

Na2(SiO2)3.3(aq) + H2SO4(aq) ? 3.3 SiO2(s) + Na2SO4(aq)

Precipitated Silica Primary Applications

• Filler, softener and performance improvement in rubber and plastic.

• Cleaning, thickening and polishing agent in toothpastes for oral health care.

• Food processing and pharmaceuticals additive as anti-caking,free-flow,thickening agent and absorbent to make liquids into powders.

• Food rheology modifier

•  Defoamer component