A concrete made of cement, aggregate and water, and carbon black sequestered from CO2.

A method of preparing a high-performance green building material based on combustion flue gas carbon dioxide mineralization, including: calculating a raw material ratio; taking each industrial solid waste material to obtain a solid powder; pouring the solid powder, dihydrate gypsum and gel material into a granulator, mixing uniformly, and then taking a part of the mixture, and then stirring the remaining mixture with deionized water sprayed until spherical kernels are formed, uniformly adding the previously-taken part of mixture to prepare an aggregate; performing hydration reaction on the aggregate; drying the hydrated aggregate to prepare spherical ceramic granules; placing the ceramic granules into a reaction kettle and introducing a combustion flue gas containing CO.sub.2 for mineralization reaction, and taking out reacted ceramic granules and putting into drying oven for drying to prepare a cold-bonded lightweight aggregate; supplementing water to the lightweight aggregate to perform hydration reaction and obtain a finished product.

The present invention relates to a method of capturing carbon dioxide comprising: a) providing a particulate material, wherein the particulate material comprises calcium carbonate and/or titanium dioxide, b) providing a silane, c) providing a surface activator, d) mixing the particulate material and the surface activator to form a surface activated particulate material, e) mixing the silane and the surface activated particulate material to form a mixture, f) mixing water and the mixture to form a composition, g) drying the composition to produce a carrier, and h) treating the carrier with carbon dioxide.

Disclosed herein is a composition comprising a) of about 80 wt % to about 99 wt % of a cementitious material; b) of about 0.05 wt % to about 3 wt % of a water-soluble organic compound and/or salts thereof, and c) of about 1 wt % to about 20 wt % of carbon dioxide. Additionally, articles comprising the disclosed herein composition are also disclosed. Also disclosed are methods of making the compositions and the articles.

A method for thermal activation of coal gangue and in-situ carbon fixation utilizing waste heat from steel slag is disclosed. By utilizing waste heat from high-temperature molten steel slag, coal gangue is activated to a high pozzolanic activity utilizing the system temperature of a steel slag hot-steaming device, and meanwhile, the CO.sub.2 released in the thermal activation process is captured utilizing the reaction of steel slag with CO.sub.2 to generate stable carbonates, thus achieving permanent carbon sequestration. The present disclosure effectively uses the heat from the hot steel slag discharged from the steelmaking furnace in such a way that the coal gangue is activated while the steel slag undergoes a carbonation reaction, resulting in an increased heat recovery rate during the cooling process of the steel slag.

A method of preparation of a reinforced carbonated construction element, includes a) preparing a composition containing a cement, metal reinforcing elements, water and hydrophobic additives; then b) a carbonation of the composition in presence of CO.sub.2 gas having a CO.sub.2 content higher than 500 ppm, wherein the composition includes more than 0.05% in weight, compared to the total weight of the cement, of hydrophobic additive.

Provide is a carbonated cement slurry production system capable of efficiently fixing carbon dioxide in a cement slurry with a larger amount. A carbonated cement slurry production system for producing a carbonated cement slurry formed by carbonation of a cement slurry containing cement and water by a carbon dioxide-containing gas, the carbonated cement slurry production system including: a carbonation apparatus for bringing the cement slurry into contact with the carbon dioxide-containing gas; and carbon dioxide-containing gas supply apparatus for supplying the carbon dioxide-containing gas to the carbonation apparatus at a pressure larger than an atmospheric pressure, wherein the carbonation apparatus includes a carbonation tank for storing the cement slurry and the carbon dioxide-containing gas so that a gas phase formed of the carbon dioxide-containing gas is positioned above a liquid phase of the cement slurry.

A method of producing a cementitious material, includes providing a raw material, heating the raw material to a temperature of 100-120 C., the heating including a first heating including heating the raw material to a first temperature in heat exchange with a heat exchanger fluid circulating in a first circulation loop, a second heating including heating the raw material to a second temperature in heat exchange with a heat exchanger fluid circulating in a second circulation loop, the second temperature being higher than the first temperature, calcining the heated raw material in a calciner to obtain a calcined material, cooling the calcined material to a temperature of <150 C. for obtaining the cementitious material, wherein sensible heat removed from the calcined material in the cooling is used as a heat source for heating the heat exchanger fluid circulating in the first and/or second circulation loop.

The present invention relates to a method of producing a carbonated composite:

a. providing a particulate mineral material, wherein the mineral material comprises metal slag, wherein the metal slag comprises steel slag;

b. providing a modifier, wherein the modifier comprises sodium gluconate;

c. mixing the mineral material and the modifier with water to form a slurry;

d. treating the slurry with carbon dioxide, to form a wet solid residue, wherein the concentration of carbon dioxide is greater than about 10 vol%; and

e. drying the wet solid residue to form the carbonated composite.

The present invention relates a mechanochemically carbonated clay. The invention further relates to methods of its production and uses thereof. The invention further relates to compositions comprising the mechanochemically carbonated clay and a further material selected from the group consisting of asphalt, cement, polymers and combinations thereof. The invention further relates to concrete and methods of their preparation.