Features of Gas Formation Chemistry at Single-Stage Synthesis of Foam Glass from Hydroxide and Sodium Nitrate

Issues of the gas formation at the single – stage synthesis of silicate foam glass from non-traditional glass-making compounds of sodium hydroxide and nitrate are considered. The method of synchronous thermal analysis combined with mass spectroscopy revealed differences in silicate formation. The hydroxyl groups can be considered as a basis for gas formation when synthesizing cellular glasses from amorphous silicon oxide and sodium hydroxide, and nitro groups when synthesizing cellular glasses from amorphous silicon oxide and sodium nitrate. It is determined that the gas formation when synthesizing the silicate glass from sodium hydroxide or nitrate and amorphous silicon oxide can be used for single-stage foaming the composition and obtaining the foam glass. The addition of carbon to the initial charge in all cases increases the volume of gases produced due to the oxidation of carbon. On the basis of the analysis of the mass spectra of gaseous products, conclusions are made about the composition of the resulting gases in the presence of carbon in the composition. In the case of the formation of silicates from hydroxide, carbon is oxidized by water vapor to carbon oxides. When glass is synthesized from nitrates, nitric oxide (II) is restored to nitric oxide (I). The resulting cellular materials in the absence of carbon or its low content are white, which expands the use of products in practice and makes it possible to use them as cladding and heat insulation materials.

Ya.I. VAYSMAN¹, Doctor of Medical Sciences (This email address is being protected from spambots. You need JavaScript enabled to view it.)
Yu.A. KETOV¹, Master (This email address is being protected from spambots. You need JavaScript enabled to view it.)
V.S. KORZANOV², Candidate of Sciences (Chemistry) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
M.P. KRASNOVSKIH², Master (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Perm National Research Polytechnic University (29, Komsomolsky Prospect, Perm, 614990, Russian Federation)
² Perm State National Research University (15, Bukireva Street, Perm, 614990, Russian Federation)

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