Parametric Study of Silica Precipitation from Geothermal Brine

E-ISSN： 1662-9795|2016|705|121-125

ISSN： 1013-9826

Source： Key Engineering Materials, Vol.2016, Iss.705, 2016-09, pp. : 121-125

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Abstract

The effects of reaction temperature, reaction time, and concentration of sodium hydroxide (NaOH) on yield and spectral similarity correlation (Corr) of silica harvested from geothermal brine are determined. The yield of geothermal silica is observed to increase when the reaction temperature is decreased, and when reaction time and NaOH concentration are increased. The Corr value is observed to increase when reaction temperature, reaction time, and NaOH concentration are decreased. The main effect of NaOH concentration and temperature significantly affects the yield and Corr of geothermal silica, respectively. To produce geothermal silica of high yield and spectral similarity to commercial silica filler for polymer, the optimum condition to precipitate silica from geothermal brine is predicted at temperature= 28°C, reaction time=12 h, and NaOH concentration= 7.5 %w/w.