Abstract: A multistage precipitation and flocculation production process is disclosed in which primary silica particles are prepared and flocculated useing an alkali metal salt solution and further silica precipitated in the presence of the salt, the pH of the mixture reduced and the silica isolated, purified carefully dried and optionally milled.
June 22, 1977
Date of Patent:
November 28, 1978
Joseph Crosfield and Sons Limited
Derek Aldcroft, Donald Barby, Anthony L. Lovell, James P. Quinn