The features of thermally activated pore formation of the zeolite-alkaline charge are considered. It was found that when the dry granular charge is kept in air, free NaOH carbonatizes with the formation of hydrated sodium carbonate - Na 3 [CO 3 ] [HCO 3 ] & middot; 2H 2 O. The same process occurs with NaOH occluded by intracrystalline pores and channels of zeolites. Sodium carbonate trapped in the intracrystalline pores and channels of zeolites is an additional source of pore-forming gas - CO 2 . This makes it possible to obtain foam glass with a density of 100 - 150 kg / m 3 from zeolite-containing rocks.
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