Kinetics of Silica Condensation In Brines

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Homogeneous nucleation and growth of silica from brines supersaturated in silicic acid has been studied over a range of pH (4.5-6.7), temperature (75-105 C), salinity, and silicic acid concentration (700 to 1200 ppm as SiO{sub 2}). The experimental technique involved analyses for molybdate-reactive silicic acid as a function of time after a supersaturated solution of H{sub 4}SiO{sub 4} was prepared by mixing aliquots of a stock silicate solution with buffered brine. The isothermal rate of SiO{sub 2} condensation is a strong function of supersaturation (C/C{sub eq}), pH, and salinity. The overall kinetics follow what is expected from the general theory ... continued below

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Harvey, W..; Makrides, A.C.; Slaughter, J & Turner, M.J. January 1, 1976.

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Homogeneous nucleation and growth of silica from brines supersaturated in silicic acid has been studied over a range of pH (4.5-6.7), temperature (75-105 C), salinity, and silicic acid concentration (700 to 1200 ppm as SiO{sub 2}). The experimental technique involved analyses for molybdate-reactive silicic acid as a function of time after a supersaturated solution of H{sub 4}SiO{sub 4} was prepared by mixing aliquots of a stock silicate solution with buffered brine. The isothermal rate of SiO{sub 2} condensation is a strong function of supersaturation (C/C{sub eq}), pH, and salinity. The overall kinetics follow what is expected from the general theory of phase transitions and are adequately described by the Volmer-Becker-Doring expressions for condensation from solution. At supersaturations less than about 3, an induction or transition time is observed. It amounts to several hundred minutes at supersaturations of about 2.0

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  • Conference on scale management in geothermal energy development, San Diego, CA

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  • Report No.: COO-2607-4
  • Report No.: CONF-760844-4
  • Grant Number: E(11-1)-2607-4
  • Grant Number: NSF-G-AER-74-17445
  • Office of Scientific & Technical Information Report Number: 886858
  • Archival Resource Key: ark:/67531/metadc873799

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1976

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 29, 2016, 4:41 p.m.

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Harvey, W..; Makrides, A.C.; Slaughter, J & Turner, M.J. Kinetics of Silica Condensation In Brines, article, January 1, 1976; United States. (digital.library.unt.edu/ark:/67531/metadc873799/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.