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The substance is silicon dioxide. Silicon dioxide includes both naturally occurring and synthetic silicon dioxides. All silicas are silicon dioxide.

Naturally occurring silicon dioxide has a crystalline structure whereas synthetic amorphous silica (SAS) is non-crystalline.

Synthetic amorphous silica (SAS) is another form of silica also known as untreated synthetic silica.

Synthetic amorphous silicon dioxide (SAS) may be produced by a thermal route yielding pryogenic silica or by a wet route yielding either precipitated silica or silica gel.

Precipitated silicas and silicon dioxide gel (also known as aerogel silica) are powders obtained by polymerization and precipitation of silica particles from an aqueous medium under the influence of high salt concentrations or other coagulants.

Silica sols are colloidal silicon dioxide. Colloidal silica is a stable aqueous dispersion or sol of discrete amorphous silica particles having diameters of 1 to 100 nm.

Silicon dioxide and synthetic amorphous silica are chemically identical. 

As an indirect use, silicon dioxide can be used in the manufacture of adhesives, coatings, defoaming agents, greases and lubricants, paper and paperboard and polymers that are then used as components of food-packaging materials. There will be no changes in the amount of silicon dioxide that may safely used in food. We have many methods for preparing amorphous silicon dioxide, for the preparation of acid leaching residue were purified amorphous silicon dioxide optimum conditions studied. Use of acid leaching slag ultra-fine grinding, acid leaching and calcination methods for purification experiments, and by scanning electron microscope , X-ray diffraction analysis.



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