FIELD: preparation of heat-resistant binding compositions, hydroinsulation of layers in oil and gas production, and construction. SUBSTANCE: polysilicic acid solution is heated by introducing live steam into solution volume with steam temperature of 110-130 and with solution temperature maintained at 85-98 C so as to increase total solution volume by 1.05-1.50 times. Solution is then concentrated by ultrafiltration. EFFECT: no formation of solid silica suspended in solution. 2 ex
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Authors
Dates
1999-08-10—Published
1998-05-29—Filed