Structural and Surface Properties of Silicon Dioxides Obtained by Extraction from Sulfuric Acid Solutions of Nepheline Decomposition

Abstract

There is presented the method of silicon dioxide obtaining by its extraction from silica-containing solution from nepheline decomposition with the acetone and ethanol help with organic phase subsequent gelatinisation. Structural and surface properties of the obtained SiO2 samples were investigated. The specific surface area of the obtained samples depends on the preparation method and varies in the range from 559 to 626 m2/g. The particles average diameter varies in the given series of samples from 2.26 to 6.68 nm. It has been found that the use of extraction has no destructive effect on the SiO2 specific surface area and maintains its original microporous structure.