FIELD: chemistry.
SUBSTANCE: invention relates to chemical processing of mineral raw material and can be used in chemical industry, particularly in production of mineral modifiers for cement binder. Silicon dioxide is obtained due to the fact that rice husk is subjected to acid hydrolysis in 10 % solution of hydrochloric or sulphuric acid, washing with water and thermal treatment at 800-900 °C in muffle furnace in air medium to obtain constant weight.
EFFECT: technical result of the invention is the production of silicon dioxide with an amorphous-crystalline structure and content of SiO2 in the calcined product of not less than 99,9 wt%, as well as with content of heavy metals and chlorides below the limits of objective determination.
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