CO2-sequestering formed building materials are provided. The building materials of the invention include a composition comprising a carbonate/bicarbonate component. Additional aspects of the invention include methods of making and using the CO2-sequestering formed building material.
대표청구항▼
1. A method for producing a formed building material comprising: a) contacting a gaseous waste stream comprising CO2 with water comprising proton removing agent to form a CO2 charged water;b) producing a CO2-sequestering component from a solution of divalent cations and the CO2 charged water under o
1. A method for producing a formed building material comprising: a) contacting a gaseous waste stream comprising CO2 with water comprising proton removing agent to form a CO2 charged water;b) producing a CO2-sequestering component from a solution of divalent cations and the CO2 charged water under one or more of precipitation conditions favoring precipitation of the CO2-sequestering component comprising a metastable carbonate comprising vaterite, aragonite, or combinations thereof; andc) forming the formed building material from the CO2-sequestering component in a process comprising contacting the CO2-sequestering component with water, wherein the formed building material is a cement board. 2. The method of claim 1, wherein the gaseous waste stream further comprises NOx, SOx, VOCs, particulates, mercury, or a combination thereof. 3. The method of claim 1, wherein the formed building material comprises 50% (w/w) CO2-sequestering component or more. 4. The method of claim 1, wherein the CO2-sequestering component further comprises bicarbonates. 5. The method of claim 4, wherein the carbonates or the combination of the carbonates and bicarbonates has a δ13C less than −5‰. 6. The method of claim 1, wherein the CO2-sequestering component further comprises calcite, ikaite, magnesite, barringtonite, nesquehonite, landfordite, amorphous magnesium carbonate, or a combination thereof. 7. The method of claim 1, wherein the carbonates are metastable such that upon contact with freshwater, the carbonates reprecipitate into freshwater stable compounds. 8. The method of claim 1, wherein the CO2-sequestering component further comprises magnesium. 9. The method of claim 8, wherein the CO2-sequestering component further comprises strontium. 10. The method of claim 1, wherein the CO2-sequestering component further comprises co-products of NOx, SOx, VOCs, particulates, mercury, or a combination thereof. 11. The method of claim 10, wherein the CO2-sequestering component further comprises sulfates. 12. The method of claim 1, wherein precipitating the CO2-sequestering component comprises utilizing a low-voltage electrochemical method for removing protons from the solution of divalent cations and the gaseous waste stream comprising CO2. 13. The method of claim 1, wherein producing the CO2-sequestering component further comprises dewatering the CO2-sequestering component after precipitating the CO2-sequestering component to produce a dewatered CO2-sequestering component. 14. The method of claim 13, wherein the dewatered CO2-sequestering component is directly used in forming the formed building material. 15. The method of claim 14, wherein at least some water for forming the formed building material is provided by the CO2-sequestering component. 16. The method of claim 1, wherein forming the formed building material comprises molding, casting, cutting, extruding, sculpting, rolling, compacting, or combinations thereof, the CO2-sequestering component. 17. The method of claim 1, wherein the cement board has a carbon footprint that is neutral or negative. 18. The method of claim 1, wherein the cement board has a compressive strength ranging from 5 to 50 MPa. 19. The method of claim 1, further comprising adding plasticizer, foaming agent, accelerator, retarder, air entrainment additive, or combinations thereof, to the CO2-sequestering component to form the cement board. 20. The method of claim 1, further comprising covering face of the cement board with a fiberglass mat. 21. The method of claim 1, further comprising adding glass fiber to the CO2-sequestering component to form the cement board. 22. The method of claim 1, wherein the cement board is a backer board. 23. The method of claim 1, wherein the one or more of precipitation conditions are selected from the group consisting of temperature, pH, additive, ion ratio, rate of precipitation, mixing rate, forms of agitation, and presence of seed crystal, catalyst, membrane, or substrate. 24. The method of claim 1, further comprising contacting the CO2-sequestering component with an additional component selected from the group consisting of clay, shale, soft slate, calcium silicate, quarried stone, Portland cement, fly ash, slag, aggregate, silica fume, pozzolans, and combinations thereof.
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