Selective removal of silica from silica containing brines

  • US 9,051,827 B1
  • Filed: 06/24/2010
  • Issued: 06/09/2015
  • Est. Priority Date: 09/02/2009
  • Status: Active Grant
First Claim
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1. A method for preventing silica scale in geothermal brine reinjection wells by selectively removing silica from a geothermal brine solution, the method comprising the steps of:

  • obtaining a geothermal brine solution comprising silica;

    maintaining the pH of the geothermal brine solution at a pH of between 4 and 6.25;

    contacting the geothermal brine solution comprising silica with activated alumina, such that silica present in the geothermal brine solution selectively binds to the activated alumina;

    recovering an aqueous brine product stream from the contacting step, said aqueous product stream having a reduced silica concentration relative to the geothermal brine solution; and

    injecting the aqueous brine product stream into the geothermal well, the aqueous brine product stream comprising less than about 80 ppm of silica.

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