FIELD: chemistry.
SUBSTANCE: invention relates to making solid gels based on complex mixtures of hydrosilicates of alkali metals. Porous silica material, which contains not less than 70 wt % amorphous SiO2 is crushed until silica sand is obtained. The sand and the air-dried granular caustic alkali are then fed into a reactor having a switched on mixer and then stirred until a hot viscous semi-finished product is obtained. The semi-finished product is loaded into containers and held therein with gradual natural cooling to ambient temperature until a mature solid hydrosilicate gel is obtained.
EFFECT: simple equipment used in the process and less need for external heat sources.
7 cl, 4 tbl
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