Experiments on Silicates and Gels Production with Using of Silica Extracted from Hydrothermal Solution

Abstract

Experiments on production of water polysilicates and gels with using colloidal silica extracted from hydrothermal solution were carried out. Silica was concentrated by reverse osmosis to content SiO2 5-27 g/liter. Than alkali NaOH was added for rising pH to 12.5, colloidal silica dissolution and production of polysilicate. After developing of reaction with silicate production HCl was added for solution neutralisation to pH 7-8 and gel formation. The physical and chemical characteristics of gels producted on the base of geothermal silica were investigated.