Abstract. The experiments on researching of colloidal silica formation in hydrothermal solution, precipitation and utilization of precipitatied material were done. Silica was precipitated by addition of coagulants, such as lime, salts of metal, sea water, by electrochemical coagulation and by freezing of dispersed solution. Physical and chemical characteristics of precipitated material were determined: concentration of impurities, specific surface area, density of surface hydroxyl groups, reflectivity of light by the surface, oil absorption capacity.

Methods of utilization of precipitated material in different industries were developed: 1) for addition to portland cement for increasing concreat strength; 2) for production of sorbent for purification of nature and industry waters from oil products; 3) for production of sorbent for gas chromatografy; 4) for liquid glass production. On the base of obtained results technology of precipitation of silica with required properties was developed. Precipitation of silica will increase the efficiency of hydrothermal heat carrier using generating of additional electric and heat energy and by production of amorphous silica material which can be utilyzed in silicate, chemical and other industries.

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