The present invention relates to a method for production of amorphous
silica from particulate materials containing at least 50% elemental
silicon, where the silicon-containing material is supplied to a combustion
reactor which is heated by an oil- or gas burner and where amorphous
silica is recovered after the outlet from the combustion reactor. At least
a part of the particulate silicon containing materials are supplied to the
combustion reactor in the form of an aqueous slurry. The invention further
relates to an apparatus for production of amorphous silica.
