An improved method for preparing low-concentration polysilicate microgels from a water soluble silicate and a strong acid in which the silicate and acid are mixed at a rate to produce a Reynolds number of at least 4000, the mixture is aged and then diluted to a silica concentration of not more than 1.0...http://www.google.com.au/patents/US5503820?utm_source=gb-gplus-sharePatent US5503820 - Method for preparing low-concentration polysilicate microgels
