A production process for producing high-purity silica from a crude silica source by means of fluosilic acid, including the steps of: (a) subjecting the crude silica souce and the fluosilicic acid to a reaction in a reaction stage, so as to produce silicon tetrafluoride and water; (b) selectively evaporating the silicon tetrafluoride with respect to at least a portion of at least one impurity derived from the crude silica source, and (c) reacting the silicon tetrafluoride with water to produce the high-purity silica, wherein the reaction stage (a) is performed at a temperature above 75.degree. C.

 
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< Pyrogenic silicon dioxide powder and dispersion thereof

> Large-volume CaF.sub.2 single crystals with reduced scattering and improved laser stability, and uses thereof

> Calcium-sodium polysulfide chemical reagent and production methods

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