The composition and method of obtaining highly porous materials at low-temperature swelling of liquid glass and ash-and-slag material from the combustion of oil shale, used as a filler and burnout additive, are proposed. It has been shown that expanded clay based on water glass must be cooled at a rate of 60 ° C / min, since at such a cooling rate, a porous material with a high coefficient of structural quality and with the highest FeO content is formed.
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