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Removing carbon dioxide from waste streams through co-generation of carbonate and/or bicarbonate minerals

  • US 9,205,375 B2
  • Filed: 09/22/2008
  • Issued: 12/08/2015
  • Est. Priority Date: 09/20/2007
  • Status: Active Grant
First Claim
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1. A method of separating heavy metals and carbon dioxide from an incoming flue-gas stream, comprising:

  • obtaining a water-condensate containing heavy metals from the incoming flue-gas stream, thereby producing a dry flue-gas stream;

    obtaining a chloride salt;

    admixing the salt with water, steam, or both to produce a solution;

    electrolyzing the solution to produce a hydroxide and chlorine gas;

    admixing a portion of the hydroxide with the dry flue-gas stream to produce carbonate products, bicarbonate products, or a mixture of carbonate and bicarbonate products in an admixture;

    separating said carbonate and/or bicarbonate products from the admixture, thereby removing carbon dioxide from the incoming flue-gas stream;

    adding to the water-condensate a precipitation agent comprising a portion of the hydroxide to change the pH of the water-condensate from acidic to basic,resulting in precipitation of the heavy metals; and

    passing the water-condensate through a filtering medium.

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