FIELD: halurgy.
SUBSTANCE: original hydrothermal solution is obtained by separating two-phase steam-water heat carrier escaping hydrothermal deposits. Solution is subjected to ageing to complete nucleation and polycondensation of orthosilicic acid and formation of colloidal silica particles, whose size and concentration depend on temperature and pH of solution in the ageing stage and on concentration and size of polycondensation nuclei. After ageing, cationic coagulators are added to solution in order to enlarge silica particles and solution is then passed to baro-membrane filters to produce concentrated aqueous silica hydrosol. Purified filtrate is used to generate electrical and heat energy. Concentrate is supplemented with alkaline metal or ammonium hydroxide resulting in reaction leading to dissolution of colloidal silica and formation of silicate-hydrates. Reaction may be accelerated by heating of the solution. Depending of SiO2/Me2O ratio, aqueous polysilicates or liquid glasses are obtained.
EFFECT: enhanced efficiency of utilizing hydrothermal heat carrier.
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