FIELD: chemistry.
SUBSTANCE: invention is intended for chemical industry and can be used for making substrates for catalysts, absorbents, agents against caking or increasing viscosity of structure, additives to dental pastes and paper, fillers for polymer compositions. First, raw material containing water with pH of 2–5 is made and simultaneously silicate and diluted acid are added to it. After achieving congelation point concentrated acid is added to maintain specified value of pH. Then adding of concentrated acid is stopped, adding of silicate is continued. After achieving pH 7–10 silicate and acid are simultaneously added again to maintain specified value of pH. Then adding of silicate is stopped, continuing to add acid to bring pH less than 6. Obtained suspension of silicon dioxide is separated and dried by spraying.
EFFECT: invention reduces power consumption and increases efficiency of production of fine-grained silicon dioxide, while preserving all its properties and characteristics.
17 cl, 2 ex
