Nucleation of orthosilicic acid with formation of colloidal silica particles in hydrothermal solutions was studied by the method of numerical simulation. Numerical simulation was done at different parameters: chemical composition, temperatures, pH, ionic strengths of hydrothermal solutions. The rates of nuclei formation and its growth, time dependence of orthosilicic acid concentration, final sizes of colloidal silica particles were calculated. Results of calculations were compared with experimental data. Experiments were carried out with solutions of Mutnovskoye and Pauzhetskoye geothermal fields. The approach based on numerical simulation can be used for developing of technology of silica extraction from hydrothermal solutions.

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