Methods for re-using industrial waste for carbon sequestration and magnesium-based cements
AssigneeZS2 Technologies Ltd.
InventorDouglas Geoffrey Brown
Life of this patent
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Abstract
Magnesium-based cements (in particular, magnesium oxychloride (MOC) cement) are synthesized with a salt (magnesium chloride for MOC cement), water, and magnesium oxide. In this invention the salt is sourced from a waste brine. To the brine is added a base, for example a hydroxide or magnesium oxide. Carbon dioxide is then bubbled through the brine. Calcium carbonate precipitates out of solution. The brine is then left to cure and form cement. Optionally, calcium carbonate precipitate can be added back to (or left in) the brine prior to curing as a filler.
Claims19
A method of producing magnesium-based cement, the method comprising:
- obtaining a brine;
- bubbling a gas through the brine wherein the gas contains carbon dioxide;
- precipitating calcium carbonate from the brine, wherein the precipitating calcium carbonate results from a reaction of calcium ions in the brine and carbon dioxide from the bubbled gas;
- adding magnesium oxide to the brine to form a mixture;
- and
- allowing the mixture to cure and to thereby form magnesium-based cement.
A method of producing magnesium-based cement, the method comprising:
- obtaining a brine;
- adding a base and magnesium oxide to the brine to form a mixture;
- bubbling a gas through the mixture wherein the gas contains carbon dioxide;
- precipitating calcium carbonate from the mixture, wherein the precipitating calcium carbonate results from a reaction of calcium ions in the brine and carbon dioxide from the bubbled gas;
- and
- allowing the mixture to cure and to thereby form magnesium-based cement.
A method of producing magnesium-based cement, the method comprising:
- obtaining a brine;
- adding a base to the brine to form a mixture;
- bubbling a gas through the mixture wherein the gas contains carbon dioxide, wherein the precipitating calcium carbonate results from a reaction of calcium ions in the brine and carbon dioxide from the bubbled gas;
- adding magnesium oxide to the mixture;
- and
- allowing the mixture to cure and to thereby form magnesium-based cement.
Dependencies are inferred from the claim text.