Removing carbon dioxide from waste streams through co-generation of carbonate and/or bicarbonate minerals
First Claim
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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Accused Products
Abstract
Apparatuses and methods for removing carbon dioxide and other pollutants including heavy metals from a gas stream are provided. The methods include obtaining a water-condensate from the 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 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 flue-gas stream; adding a portion of the hydroxide to the water-condensate 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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Citations
8 Claims
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1. A method of separating heavy metals and carbon dioxide from an incoming flue-gas stream, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification