100results about "Carbon capture" patented technology

Methods of capturing carbon in biochar are provided. The method includes mixing the biochar with an alkaline solution to form an intermediate mixture, and exposing the intermediate mixture to a CO2 source to precipitate calcium carbonate over and in the biochar to form a CO2 weathered biochar. In some cases, the method further includes injecting CO2 into the alkaline wastewater to sequestration / store CO2, which may then be used as mixed water for the production of cementitious composites. The method can be used for upgrading three waste streams, and the treated CO2 weathered biochar maintains the compressive strength of the obtained concrete when replacing part of the pre-cured cement and aggregate components. In addition, the treated CO2-weathered recycled aggregate maintains the mechanical strength of the obtained concrete when replacing part of the aggregate.

The invention provides methods and compositions for treating wash water from concrete production with carbon dioxide. The treated wash water can be reused as mix water in fresh batches of concrete.

To provide clinker powder that can absorb more carbon dioxide during a curing process, thereby reducing the total amount of carbon dioxide emitted, and that can produce a cement composition with excellent strength development, and a method for producing the clinker powder.SOLUTION: The clinker powder has a mineral composition having a hydraulic modulus (H.M.) of 1.1-2.0, a silica modulus (S.M.) of 1.5-3.5, an iron modulus (I.M.) of 1.7-3.5, and a total content of aluminum oxide (Al2O3) and iron oxide (Fe2O3) of 9.0-14.0 mass%.SELECTED DRAWING: None

Embodiments of the present invention disclose a cement production system, a preheating assembly of the system has a first inlet for receiving cement raw materials and a first outlet for discharging the cement raw materials preheated by the preheating assembly; a first cylinder is in communication with the first outlet to receive the preheated cement raw materials discharged from the preheating assembly, a combustion assembly is arranged on the outer wall of the first cylinder, the combustion assembly is used for heating and decomposing calcium carbonate in the cement raw materials into semi-clinker and carbon dioxide gas, the first cylinder has a second outlet for discharging the semi-clinker and a third outlet for discharging the carbon dioxide gas; a part of a sintering assembly is in communication with the second outlet to receive the semi-clinker discharged from the first cylinder and sinter the semi-clinker into clinker; a carbon capture assembly is in communication with the third outlet to receive the carbon dioxide gas discharged from the first cylinder and capture and recycle the carbon dioxide gas. The cement production system of the embodiments of the present invention significantly reduces the energy consumption of carbon capture.

The disclosure relates to a method for controlling carbonation synthesis of silicon and / or aluminium carbonate minerals, wherein the concentration of dissolved silicon and / or aluminium in a mix to be cured is adjusted to at least 1 mmol / 1 before curing the mix with gas comprising carbon dioxide (CO2) having a partial pressure of CO2 of at least 0.15 bar. In some embodiments of the disclosure an alkaline substance is added to the raw material to provide the mix where the total concentration of dissolved silicon and / or aluminium of at least 1 mmol / 1. The disclosure also relates to a product obtainable by the methods of the disclosure as well as to the use of the product as building material, preferably for producing concrete-like products, more preferably for elements, most preferably for pre-casted elements and to the use of the method in construction industry or for production of elements and / or pre-casted elements.

The invention relates to a method for producing material containing hydrated cement, wherein the material is crushed in a first crushing device (2) and then supplied to a reactor (3) in which the material is mixed with an aqueous liquid and CO2 and in which a mixing movement of the material is generated, wherein the material removed from the reactor (3) is split into at least two fractions by means of a grading device (20). Furthermore, the temperature and the pressure in the reactor (3) are influenced such that an overpresssure in comparison with the atmospheric pressure and a temperature higher than 100°C are adjusted.

Method and equipment for conditioning wet concrete (703), the wet concrete (703) being agitated in a revolving-drum concrete mixer (702), thereby bringing changing portions of the wet concrete (703) to a free surface (706) of the wet concrete (703) inside the mixer (702), the agitated wet concrete (703) being cooled and partially carbonated in that liquid and / or solid carbon dioxide is supplied to the concrete mixer (702) simultaneously with liquid nitrogen so that both the supplied nitrogen and the supplied carbon dioxide contact the free surface (706) of the wet concrete (703).

The present invention relates to methods for integrating CO2-mediated mineral carbonation and / or activation in a cement production facility and methods for producing low-carbon-footprint cement, comprising withdrawing at least part of the exhaust gas generated cement production, conditioning it by modifying one or more of temperature, pressure, CO2 concentration and humidity, subjecting an activatable solid feedstock to a size-reduction operation in a size-reduction apparatus distinct from the raw mill and cement mill, and producing low-carbon-footprint cement by mixing the CO2-activated material with the cement wherein mixing is performed feeding the CO2-activated material to the cement mill or a distinct mixing apparatus.

A carbonated slurry production system that can continuously and efficiently fix carbon dioxide in a slurry formed of calcium-containing powder and water, and that can easily and stably control an average retention time of the slurry,including: a slurry tank having a first slurry storage portion for contacting the slurry with a carbon dioxide-containing gas, a slurry supply device for supplying a slurry containing a calcium-containing powder and water; a carbon dioxide-containing gas supply device for supplying a carbon dioxide-containing gas at a pressure greater than atmospheric pressure to a gas phase formed of the carbon dioxide-containing gas in the first slurry storage portion; carbonated slurry discharge device for discharging the carbonated slurry; liquid surface measurement unit for measuring the height of a liquid surface; and a slurry control device for controlling the average retention time of the slurry based on the heights of the first and second liquid surfaces.

To provide a carbonation hardening body capable of largely reducing a total amount of carbon dioxide exhausted and having large strength, by absorbing a large amount of carbon dioxide in an aging process.SOLUTION: A carbonation hardening body obtained by carbonating a hardening body of a hydraulic composition containing (A) a powdery hydraulic material containing C2S and C2AS and containing pulverized calcined material that satisfies the following conditions (1) and (2), (B) water, and (C) an aggregate containing cement hydrate-containing aggregate. (1) When the fired product does not contain C4AF, an amount of C2AS is 10 to 2,000 pts.mass with respect to 100 pts. mass of C2S, and when the fired product contains C4AF, a total amount of C2AS and C4AF with respect to 100 pts.mass of C2S is 10 to 2,000 pts.mass, and a ratio of C4AF in the total 100 mass% of C2AS and C4AF is 70% by mass or less, and (2) the fired product does not contain C3A or contains C3A in an amount of 20 pts.mass or less relative to 100 pts.mass of C2S.SELECTED DRAWING: None

The present invention relates to compositions comprising a mechanochemically carboxylated inorganic filler and a binder, wherein the binder is cement and / or asphalt, and the filler is obtained from a mechanochemically carboxylated silicate mineral. The present invention also relates to methods for making such compositions. The present invention further relates to methods for making concrete from these compositions, and to the concrete obtained from such methods. The present invention also relates to methods for using the mechanochemically carboxylated inorganic filler, for example, as a filler in asphalt or cement.

Methods of making settable compositions that include uncured carbonate aggregates are provided. Aspects of the methods include: preparing a carbonate slurry, subjecting the carbonate slurry to rotational action (optionally with an aggregate substrate), to produce an uncured carbonate aggregate, and then combining the uncured carbonate aggregate with a cement component and a liquid to produce the settable composition. Also provided are settable compositions produced by the methods and uses thereof.

The present invention relates to a method for manufacturing a carbonated binder using carbon dioxide for treating captured carbon dioxide, a deep cement mixing method for improving soft ground using same, a carbonation reaction apparatus used in the method for manufacturing a carbonated binder, and a carbon dioxide capture device using the carbonation reaction apparatus. The method for manufacturing the carbonated binder comprises: (a) mixing a powdered binder with mixing water to generate a liquid mixed binder; and (b) reacting the generated liquid mixed binder with carbon dioxide by means of a carbonation reaction apparatus to produce a carbonated binder, wherein the carbonation reaction apparatus may be configured to operate in a continuous flow manner in which the liquid mixed binder is sequentially introduced, reacted with carbon dioxide, and discharged.

The present invention provides a cementitious reagent material produced from globally abundant inorganic feedstocks, methods for the manufacture of such cementitious reagent material and for forming the reagent material as microspherical glassy particles, and also provides an apparatus, system, and method for the thermochemical production of glassy cementitious reagent having a spherical morphology. [Solution] A cementitious reagent is provided, which includes particles containing atoms of Si, Al, Fe, Ca, Mg, Na, and K, said particles having a spherical morphology with an average circularity (R) of >0.8, and said particles being at least 80% X-ray amorphous.

Methods of making a hydraulic cement are provided. Aspects of the methods include employing precipitated calcium carbonate (PCC), such as a CO2 sequestering PCC, as a feedstock for lime (CaO) production. Also provided are hydraulic cements and concretes produced by methods of embodiments of the invention, as well as products produced therefrom. In addition, systems for practicing methods of embodiments of the invention are provided.

Divalent ions are extracted from solids by leaching to form a divalent ion-containing solution. The divalent ion-containing solution is subjected to concentration to form a concentrated divalent ion-containing solution. Precipitation of a divalent ion hydroxide salt is induced from the concentrated divalent ion-containing solution. In other cases, the concentrated divalent ion-containing solution is exposed to carbon dioxide to induce precipitation of a divalent ion carbonate salt.

A cement clinker producing system, capable of providing a gas containing a carbon dioxide gas at a high concentration by increasing a carbon dioxide gas concentration for a part of an exhaust gas, includes a cyclone preheater to preheat a cement clinker raw material, a rotary kiln to burn the preheated cement clinker raw material so as to provide cement clinker, a calcination furnace to promote decarbonation of the cement clinker raw material, a clinker cooler to cool the cement clinker, a kiln exhaust-gas discharge passages to discharge an exhaust gas generated in the rotary kiln, a combustion-supporting gas supply device to supply a combustion-supporting gas having a higher oxygen concentration than air, a combustion-supporting gas supply passage to guide the combustion-supporting gas to the calcination furnace, and a calcination furnace exhaust-gas discharge passage to discharge a carbon dioxide gas-containing exhaust gas generated in the calcination furnace.

This invention provides a cement clinker manufacturing system that can produce carbon dioxide-containing material with a high concentration of carbon dioxide. [Solution] A cement clinker manufacturing system 1 comprising a cyclone-type preheating device 2, a rotary kiln 3, a calcination furnace 4 for promoting the decarbonation of cement clinker raw materials, a clinker cooler 5, a kiln exhaust gas discharge passages 6a to 6e, a combustion-supporting gas supply device 7 for supplying combustion-supporting gas with a higher oxygen concentration than air, a combustion-supporting gas supply passage 8, a carbon dioxide purification device 13 for purifying carbon dioxide-containing exhaust gas generated in the calcination furnace 4, a first calcination furnace exhaust gas supply passage 9 for guiding the exhaust gas from the calcination furnace 4 to the carbon dioxide purification device 13, a cement clinker raw material recovery device 18 for returning the decarbonated cement clinker raw materials, and a first oxygen-containing residual gas supply passage 24 for guiding oxygen-containing residual gas to at least one of the rotary kiln 3 and the calcination furnace 4.

Provided herein is a method for producing a cement material, said method comprising steps of: a. reacting sulfur dioxide and water to form a first acid, the first acid comprising at least one sulfur-containing anion; b. reacting the first acid and a first cement precursor to form a second cement precursor; wherein the second cement precursor comprises the at least one sulfur-containing anion; and c. converting the second cement precursor to the cement material. Also provided is a system for producing a cement material.

A carbon-neutral, or even carbon-negative, cement is provided. The hardening of these novel cements is based on acid-base reactions, and the cements are formulated with CO2- or biomass-derived organic acids, organic acid salts (e.g., NaHC2O4), or mixtufres thereof, and geographically abundant mineral bases, with or without small-dose functional admixtures or additives.

The present invention provides a method for supplying oxygen-rich gas to an oxygen-consuming step, which comprises supplying an anode-side feed gas containing CO2 to the anode side of a solid oxide electrolysis cell to generate oxygen-rich gas with a low nitrogen content, and generating oxygen on the anode side of the solid oxide electrolysis cell. In this manner, an anode-side product gas containing at least a portion of the oxygen-rich gas is formed. The oxygen-rich gas has a low nitrogen content, and the temperature of the oxygen-rich gas exiting the solid oxide electrolysis cell is between 600 and 1000°C. This method has several advantages, primarily in terms of energy conservation.

The invention provides methods and compositions for treating wash water from concrete production with carbon dioxide. The treated wash water can be reused as mix water in fresh batches of concrete.

The present invention relates to a cement production apparatus (10) comprising: - a preheater (12) for preheating raw meal; - a calcining furnace (14) for calcining the preheated raw meal; - a furnace (16) having a furnace burner (28) for calcining the raw meal to form cement clinker, wherein the furnace (16) has a combustion gas inlet for introducing combustion gas with an oxygen content of 30% to 75% into the furnace (16); and - a cooler (18) for cooling the cement clinker; wherein the calcining furnace (14) and the furnace (16) each have at least one fuel inlet (20) for introducing at least one fuel into the calcining furnace (14) and the furnace (16), wherein the calcining furnace (14) and the furnace (16) each have at least one inert gas inlet (64, 68) for introducing inert gas into the calcining furnace (14) and the furnace (16), respectively.

The invention relates to a plant (100, 200, 300, 400) for producing cement clinker from a raw material, comprising at least one heat exchanger (110, 210, 310, 410) located downstream in the direction of gas flow and at least one device (120, 220, 320, 420) for preheating, calcining and sintering the raw material, which device can be composed of individual and successive devices, wherein at least one device (120, 220, 320, 420) for preheating, calcining and sintering the raw material is connected on the primary side to at least one heat exchanger (110, 210, 310, 410) located downstream in the gas flow direction and is supplied with exhaust gas. According to the invention, at least one heat exchanger (110, 210, 310, 410) located downstream in the gas flow direction is connected on the secondary side to a downstream device for separating and / or sequestering carbon dioxide (CO) from the exhaust gas. This plant configuration that abandons a raw material preheater allows the plant to be operated over-fueled such that the off-gas of the plant has sufficient heat for operating a coupling process for separating and / or sequestering carbon dioxide.

Methods and systems for calcining dewatered tailings and / or mine waste are disclosed herein. In some embodiments, the method comprises (i) processing dewatered tailings comprising clay minerals, (ii) calcining the processed tailings to produced calcined tailings, and (iii) altering a composition and / or one or more characteristics of the calcined tailings to produce a cementitious product. Altering the composition can include blending the calcined tailings with one or more additives, such as lime, dolomitic lime, lime kiln dust, argillaceous limestone, limestone, pulverized quicklime, ground calcium carbonate, quicklime, gypsum, natural pozzolans, artificial pozzolans, water, flow aids, or the like.

This application discloses a zero-carbon emission cement production device and method based on hydrogen energy utilization. The production device includes: a hydrogen production system, a fuel cell system, a waste heat recovery system, a cement clinker calcination decomposition furnace system, a cement clinker calcination rotary kiln system, a grinding system, and a methanol synthesis system. This application uses hydrogen to partially replace the kiln fuel, which can achieve carbon emission reduction with minimal changes to the existing cement production line technology and at a relatively low modification cost. Addressing the high energy consumption and high carbon emissions in the cement industry, this application optimizes the material and energy flow throughout the entire cement production process, achieving the recycling of materials and the cascade utilization of energy, ensuring the low-carbon and environmentally friendly nature of the entire production method.

The invention belongs to the technical field of waste utilization devices, and particularly relates to a concrete-microalgae co-production system for carbon dioxide curing. The co-production system comprises a carbon dioxide trapping device, a microalgae culture device and calcining equipment; the microalgae culture device comprises a culture box, the bottom of the culture box is provided with an air inlet, a slag discharge port and an oil discharge port, and the top of the culture box is provided with an air outlet; a gas outlet of the carbon dioxide trapping device is communicated with a gas inlet of the incubator, and a slag discharging opening of the incubator is communicated with a feeding opening of the calcining equipment. According to the co-production system, the carbon dioxide trapping device, the microalgae culture device and the calcining equipment are connected for use, industrial waste gas is treated by the carbon dioxide trapping device, then carbon dioxide is introduced into the microalgae culture device, the carbon dioxide is efficiently fixed through photosynthesis of microalgae, and algae oil (biofuel) and algae residues are synchronously produced; and the algae residues are reused for cement clinker firing, so that a closed-loop industrial chain of carbon capture-biomass energy-building material regeneration is realized.

Provided are a cement firing facility and a firing method in a cement firing facility, in which combustion exhaust gas produced in a cement firing facility is effectively utilized to increase the carbon dioxide concentration exhausted from the cement firing facility and to efficiently recover carbon dioxide, and combustibility of fuel is improved to improve a heat efficiency of the cement firing facility.

The present invention relates to a method for the mechanochemical sequestration or capture of carbon from CO2 in solid feedstocks, the method comprising contacting a first carbon-rich gas with the solid feedstock in a size reduction apparatus such as a mill, followed by submitting the carbonated feedstock to a second carbon sequestration step by contacting it with a second carbon-rich gas. The first and second carbon-rich gas are both obtained from a combustion flue gas or a cement kiln flue gas.