Peculiarities of Gas Formation in One-Stage Synthesis of Foamed Glass Using Sodium Carbonate and Sodium Sulfate

Issues of the gas generation in the one-stage synthesis of silicate foam glass from the traditional glass compounds using sodium carbonate and sodium sulfate are discussed in the article. The differences in silicate formation in oxidative and inert atmospheres were revealed by the method of synchronous thermal analysis combined with mass spectroscopy. The formation of silica from sodium sulfate occurs through the intermediate formation of sulfite is assumed. It is established that the single-stage production of foamed glass from sodium sulfate and silicon oxide is impossible due to the proceeding of silica formation reactions at high temperatures, at which the melt of silicate has a low viscosity, and the gases formed easily leave the formed glass. It is determined that gas generation in the synthesis of silicate glass from sodium carbonate and amorphous silicon oxide can be used for one-stage foaming of the composition and foamed glass preparation. The use of amorphous silicon oxide instead of crystalline one leads to a significant decrease in the temperatures of silica formation and opens up the possibility of one-stage foamed glass technology. The mechanism of gas formation for the direct synthesis of gas-filled cellular silicates, such as foamed glass, from amorphous silica and sodium carbonate is revealed

A.A. KETOV¹, Doctor of Sciences (Engineering) (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. KRASNOVSKIKH2, 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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