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Carbon dioxide sequestration using alkaline earth metal-bearing minerals

  • US 7,722,842 B2
  • Filed: 12/30/2004
  • Issued: 05/25/2010
  • Est. Priority Date: 12/31/2003
  • Status: Active Grant
First Claim
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1. A method for mineral carbonation of carbon dioxide comprising,providing a particulate magnesium-containing mineral;

  • exposing said magnesium-containing mineral to an aqueous solution containing from about 0.5 to about 5.0% by weight of a weak acid to dissolve magnesium from said mineral and form a magnesium-containing solution;

    physically activating the surface of said particulate magnesium-containing mineral by fluidizing said particulate magnesium-containing mineral with grinding media, ultrasonic energy, or microwave energy to expose and dissolve additional magnesium into said solution;

    separating the remaining particulate from said magnesium-containing solution;

    mixing a gas containing carbon dioxide with said magnesium-containing solution; and

    increasing the pH of said magnesium-containing solution to form magnesium carbonate and to remove carbon dioxide from said carbon dioxide containing gas.

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