Physical and chemical processes in hydrothermal
solution in which colloidal silica took part were
researched. The rate of nucleation of orthosilicic acid
molecules H4SiO4 were calculated with the help of
mathematical model. The order and constants of rate
of silicic acid polymerization reaction were
determined. The sizes and diffusion coefficients of
colloidal silica particles were measured. Mechanism
of coagulation and precipitation of colloidal silica
particles by metal cations was investigated. In the
experiments various types of metal cations were
added to the solution: Ca 2+ , Mg 2+ , Co 2+ , Cu 2+ , Pb 2+ ,
Al 3+ , Fe 3+ . Cations were added to the solution with
slaked lime, calcium chloride, magnesium sulphate,
cobalt sulphate, cupric sulphate, plumbous nitrate,
aluminium sulphate, aluminium chloride, ferric
chloride, sea water. Also cations were added by
electrocoagulation on electrodes with soluble metals
such as aluminium, ferric and cupric electrodes. The
technological scheme of silica precipitation from the
separate of geothermal electric power station was
developed.

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