Methods using slag to provide supplementary cementing material and co2 sequestration
AssigneeNucor Corporation
InventorsDavid W. Hendrickson, Lindsay Leveen
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Abstract
Materials and methods for removing CO2 from CO2-comprising gas, e.g., stack gases from production of steel or hydrocarbon fuel combustion, air, are disclosed, which comprises exposing prepared slag to the CO2-comprising gas. The disclosure also provides for an apparatus for exposing CO2-comprising gas to slag and continuous processes of removing slag from a steel manufacturing process, contacting CO2 from the CO2-comprising gas with the slag, and directly capturing CO2 and/or providing SCM material.
Claims20
A process for providing supplementary cementing material from slag, the process comprising:
- grinding slag to a plurality of slag particles having an average particle size of less than 50 microns;
- mixing and heating the plurality of slag particles in the presence of a CO2 source gas;
- forming an amount of CaCO2 on at least a surface of the plurality of slag particles to provide CaCO2-surface coated slag particles;
- releasing at least a portion of the amount of CaCO2 from the CaCO2-surface coated slag particles to provide free CaCO2;
- and
- discharging the CaCO2-surface coated slag particles and free CaCO2.
An apparatus for providing SCM and/or removing at least a portion of CO2 from a CO2 source gas, the apparatus comprising, in combination:
- (a) a device configured to introduce the CO2 source gas to a slag;
- and
- (b) a device configured to recovery a reaction product of the slag with the CO2 source gas.
Dependencies are inferred from the claim text.