Production of Efficient Heat-Insulating Materials on the Basis of Silica Gel

The resource and energy saving process of producing the heat-insulating material “Siver” on the basis of waste of fluorides production, silica gel, has been developed. The production technology includes main stages: mechanoactivation of silica gel, components mixing, synthesis of sodium polysilicates, crushing and classification, foaming. The central element of the developed technological process is the stage of hydrothermal synthesis of poly-silicates based on suspensions of silica gel and NaOH, which is carried out in four stages: reaction of depolymerization of silica, coagulation, dispersion and poly-condensation. A particularly important point, providing the final product with a density of less than 150 kg/m³, is the separation in time of the first two stages. The obtained granulated foamed material “Siver” has a complx of properties similar to the traditional foam glass, by the price/quality ratio it surpasses known analogs at the market of building materials of inorganic origin and is comparable to the foam plastics. A significant advantage of the material is its wide range of applications that is provided by the possibility to obtain a fine-grained and narrow fractional product, for example, fractions of 0.5–2 mm, which is urgently demanded at the market.

I.M. TERESHCHENKO, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
B.P. ZHIKH, Master of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
A.P. KRAVCHUK, Candidate of Sciences (Engineering)

Belarusian State Technological University (13a, Sverdlova Street, Minsk, 220006, Belarus)

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