Carbon sequestration method and apparatus for autoclaved aerated concrete products

Abstract

Disclosed are a method and apparatus for carbon sequestration used for autoclaved aerated concrete products, belonging to the technical field of industrial carbon reduction. The present invention realizes efficient carbon fixation of solid waste by means of improving wet grinding process parameters and apparatuses; when it is used to prepare autoclaved aerated concrete products, it can not only absorb industrial flue gas and capture carbon dioxide gas in a production process for autoclaved aerated concrete products and in chemical industrial parks, but can also ensure the performance of autoclaved aerated concrete products, and has significant carbon reduction benefits.

Description

Carbon sequestration method and apparatus for autoclaved aerated concrete products Technical Field

[0001] The present invention relates to the technical field of industrial carbon reduction and decarbonization, and in particular to a carbon sequestration method and device for autoclaved aerated concrete products. Background Art

[0002] Carbon emissions from buildings account for 51.3% of total carbon emissions, of which building materials account for 28%. Developing green, low-carbon building materials to replace high-energy-consuming, high-carbon-emission materials is crucial for reducing carbon emissions. With the deepening of ecological civilization construction and the continuous improvement of environmental protection requirements, the comprehensive utilization of solid waste, as a key component of building a green, low-carbon circular economy, is essential for the comprehensive utilization of resources and the comprehensive improvement of resource utilization efficiency.

[0003] Autoclaved aerated concrete products are important building materials, including autoclaved aerated blocks, autoclaved aerated boards and other product types. Autoclaved aerated concrete has the characteristics of light weight, heat preservation, sound absorption, fire resistance, earthquake resistance, and easy processing. The dry density can reach 300-800kg / m 3 , only one-third to one-eighth of ordinary concrete. Due to the large number of closed pores within it, the thermal conductivity is generally less than 0.2W / (m·k), and the sound absorption coefficient can reach 0.2-0.4, making it an excellent thermal insulation and sound absorption material. Therefore, in construction, it can be used as both a non-load-bearing external insulation material and as a load-bearing block in low-rise buildings, making it an important material for improving building energy conservation.

[0004] However, in order to achieve light weight and high mechanical strength, autoclaved aerated concrete needs to be cured at high temperature and high pressure, which consumes a lot of energy and is accompanied by the emission of carbon dioxide. The collection and utilization of carbon dioxide will face high costs. Therefore, the recycling of carbon dioxide emitted during the production of autoclaved aerated concrete products has important practical significance. Using alkaline earth metal ions in large amounts of solid waste to solidify and seal carbon dioxide and convert it into cementitious materials is a carbon reduction method with great potential. However, the alkaline earth metal ions in solid waste often exist in the form of relatively stable amorphous or crystalline substances, and the soluble alkaline earth metal ions are limited. It is difficult to effectively dissolve soluble alkaline earth metal ions through conventional methods, resulting in low carbon fixation efficiency and low carbon fixation amount, which hinders the application of carbon-fixing cementitious materials in building materials.

[0005] Therefore, given the massive production of autoclaved aerated concrete products, promoting the dissolution of ions with carbon sequestration and carbon storage potential from solid waste is crucial to the carbon sequestration process. By mineralizing carbon and using it to prepare autoclaved aerated concrete materials, we can not only absorb carbon emissions from the autoclaved aerated concrete production process, but also absorb CO2-rich industrial flue gas or collected CO2 from surrounding industrial parks, effectively promoting the development of green building materials.

[0006] Summary of the Invention

[0007] In view of the above-mentioned deficiencies in the prior art, in a first aspect of the present invention, a highly efficient and environmentally friendly carbon sequestration method for autoclaved aerated concrete products is provided, comprising the following steps:

[0008] (1) The carbon dioxide gas source is pressurized to obtain pressurized gas; solid waste is mixed with water to obtain solid waste slurry;

[0009] (2) The solid waste slurry is wet-milled in the pressurized gas atmosphere to obtain a carbonized solid waste slurry; after the wet-milling treatment is completed, the carbon dioxide concentration of the wet-milling residual gas is detected, and the wet-milling residual gas with a concentration not lower than a set concentration is collected and recycled as a carbon dioxide gas source, and the wet-milling residual gas with a concentration lower than the set concentration is directly recovered;

[0010] (3) mixing the carbonized solid waste slurry with the uncarbonized solid waste, auxiliary materials, and admixtures, or only mixing the carbonized solid waste slurry with auxiliary materials and admixtures to obtain a mixed slurry; and subjecting the mixed slurry to a static curing treatment under set conditions to obtain an aerated concrete body;

[0011] (4) The aerated concrete body is autoclaved and cured in a carbon dioxide atmosphere of a set concentration to obtain an autoclaved aerated concrete product; after the autoclaving is completed, the autoclaved residual gas is recovered and recycled as a carbon dioxide gas source.

[0012] Preferably, in step (1), the concentration of carbon dioxide in the carbon dioxide gas source is ≥5%, the concentration of sulfur dioxide is ≤2%, and the contents of other components meet the requirements of GB 13223-2011.

[0013] Preferably, in step (1), the carbon dioxide gas source includes industrial flue gas or captured and recovered carbon dioxide gas.

[0014] Preferably, in step (1), the pressure of the pressurized gas is 0.2-0.35 MPa.

[0015] Preferably, in step (1), the total content of calcium oxide and silicon oxide in the solid waste is ≥25 wt.%; and the median particle size of the solid waste is ≤300 μm.

[0016] Preferably, in step (1), the solid waste includes at least one of steel slag, construction waste powder, fly ash, high calcium fly ash, red mud, slag, magnesium slag, phosphorus slag, aerated block waste, nickel slag, and copper slag.

[0017] Preferably, in step (1), the mass ratio of the solid waste to water is 1:0.8-5.

[0018] Preferably, in the step (2), during the wet grinding treatment, the conveying rate of the solid waste slurry is 30 to 70 L / min, the ball-to-material ratio of the grinding balls to the solid waste slurry is 1:0.2 to 2, and the wet grinding rate is 200 to 800 rpm.

[0019] Preferably, in step (2), wet grinding residual gas with a carbon dioxide concentration of ≥5% is collected and recycled as a carbon dioxide gas source, and wet grinding residual gas with a carbon dioxide concentration of <5% is directly recycled.

[0020] Preferably, in step (3), the auxiliary materials include cement, lime, and gypsum; and the admixtures include air entraining agents and foam stabilizers.

[0021] Further preferably, in parts by weight, the total amount of the solid waste and the carbonization-treated solid waste slurry is 480 parts, of which the amount of the carbonization-treated solid waste slurry is 48 to 480 parts; the amount of the cement is 90 to 120 parts, the amount of the lime is 50 to 85 parts, and the amount of the gypsum is 15 to 25 parts; the amount of the air entraining agent is 5 to 10 parts, and the amount of the foam stabilizer is 0.8 to 1.3 parts.

[0022] Further preferably, the cement is silicate cement or ordinary silicate cement, and its strength grade is 42.5; the lime is quicklime, and its calcium oxide content is ≥85%; the gypsum is one of desulfurized gypsum, phosphogypsum, and natural gypsum, and its phosphorus and fluorine content is ≤1%.

[0023] Further preferably, the air entraining agent is one of aluminum powder, sodium lauryl sulfate, sodium fatty alcohol polyoxyethylene ether sulfate, and rosin soap foaming agent, and its standard mesh number is ≤80 mesh; the foam stabilizer is one of natural saponin, polyacrylamide, and cellulose ether.

[0024] Preferably, in step (3), the mixing rate is 350-450 rpm, and the mixing time is 3-5 min.

[0025] Preferably, in step (3), the resting treatment is resting at 45-55° C. for 1.5-2.5 hours.

[0026] Preferably, in step (4), the carbon dioxide concentration of the carbon dioxide atmosphere is ≥85%.

[0027] Preferably, in step (4), the temperature of the autoclave curing is 170-190° C., the pressure is 0.5-1.3 MPa, and the autoclave curing time is 4-10 h.

[0028] In a second aspect of the present invention, there is provided an apparatus for carbon sequestration in autoclaved aerated concrete products, comprising a solid waste slurry supply and recovery system, a wet carbon sequestration grinding system, a gas circulation system, and a carbon sequestration slurry storage system;

[0029] The solid waste slurry supply and recovery system includes a solid waste raw material supply system 1, a solid waste raw material recovery system 2, a feed inlet valve 3, a solid waste raw material feed inlet 4, an equipment cleaning discharge port 5, and an equipment cleaning discharge port valve 6;

[0030] The wet carbon fixation grinding system includes a grinding drum 7, a stirring blade 8, a grinding motor 9, a wear-resistant drum bottom 10, a flue gas inlet valve 11, a flue gas inlet 12, a cavity 13, and a discharge port 14;

[0031] The solid waste raw material feed port 4 is set at the bottom end of the mill barrel 7 along the tangential direction, and the inner cavity of the wet carbon fixation grinding system is connected with the solid waste raw material supply system 1 through the solid waste raw material feed port 4. The solid waste raw material feed port 4 is provided with a feed port valve 3 for controlling its opening and closing state; the stirring blade 8 is set along the central axis direction of the mill barrel 7, and the mill motor 9 is set at the top of the mill barrel 7. The rotating shaft of the stirring blade 8 passes through the top wall of the mill barrel 7 and is connected to the mill motor 9. The rotation of the stirring blade 8 is driven by the drive of the mill motor 9; the wear-resistant barrel bottom 10 is set at the bottom of the mill barrel 7, and the height of the contact point between the wear-resistant barrel bottom 10 and the inner wall of the mill barrel 7 is not higher than The height of the lower wall of the solid waste raw material feed port 4; the equipment cleaning discharge port 5 is arranged through the bottom end of the mill barrel 7 and is connected to the solid waste raw material recovery system 2, and the equipment cleaning discharge port 5 is provided with an equipment cleaning discharge port valve 6 for controlling its opening and closing state; the flue gas inlet 12 is arranged through the bottom end of the mill barrel 7 along the tangential direction, and the height of the upper wall of the flue gas inlet 12 is not higher than the height of the contact point between the wear-resistant barrel bottom 10 and the inner wall of the mill barrel 7. The flue gas inlet 12 is provided with a flue gas inlet valve 11 for controlling its opening and closing state, and the bottom of the wear-resistant barrel bottom 10 and the bottom wall of the mill barrel 7 surround a cavity 13, and the discharge port 14 is arranged through the upper end of the mill barrel 7 along the tangential direction;

[0032] The gas circulation system includes a gas-liquid separation transfer tank 15, a carbon dioxide concentration sensor 16, a recovery gas control valve 17, a gas circulation device 18, an exhaust gas control valve 21, and a gas recovery tank 22;

[0033] The carbon fixation slurry storage system includes a carbonization slurry agitator 19, a carbonization slurry storage tank 20, a discharge port 23, and a discharge port control valve 24;

[0034] The gas-liquid separation transfer tank 15 is connected to the discharge port 14, the carbon dioxide concentration sensor 16, and the carbonized slurry storage tank 20. The carbon dioxide concentration sensor 16 is connected to the gas circulation device 18 and the gas recovery pool 22. The connecting passages between the carbon dioxide concentration sensor 16 and the gas circulation device 18 and the gas recovery pool 22 are respectively provided with a recovery gas control valve 17 and an external gas control valve 21 for controlling the opening and closing state of the connecting passages; the carbonized slurry agitator 19 is arranged in the inner cavity of the carbonized slurry storage tank 20, and the discharge port 23 is arranged at the bottom of the carbonized slurry storage tank 20 along the tangential direction, and the discharge port 23 is provided with a discharge port control valve 24.

[0035] Preferably, the wear-resistant cylinder bottom 10 is an arc-shaped structure made of wear-resistant alloy steel, and is provided with 1 to 5 circular holes with a diameter of 0.5 to 3 mm per square centimeter.

[0036] Preferably, the rotation speed of the carbonized slurry agitator 19 during operation is ≥50 rpm.

[0037] When the process of the present invention is applied, the key steps are achieved by a device for carbon sequestration in autoclaved aerated concrete products. The specific preparation process is as follows:

[0038] After the carbon dioxide gas source is pressurized by the gas circulation device 18, the flue gas inlet valve 11 is opened to allow it to be fed into the wet grinding device through the flue gas inlet 12; the feed port valve 3 is opened, and the solid waste slurry is fed into the wet grinding device through the solid waste raw material supply system 1 and the solid waste raw material feed port 4; the grinding motor 9 outputs power to drive the stirring blade 8 to rotate, so that the carbon dioxide gas source, solid waste slurry and grinding balls are mixed for wet grinding. During the wet grinding process, the cleaning discharge port valve 6 is in a closed state. After continuous production, the gas-liquid mixture is discharged through the discharge port 14; when the wet grinding process is completed, the feed port valve 3 is closed and the device is opened. The discharge port valve 6 is prepared for cleaning, and the material in the cylinder is recovered through the equipment cleaning discharge port 5 and recycled to the solid waste raw material recovery system 2; the mixture of carbonized solid waste slurry and wet grinding residual gas outputted from the discharge port 14 passes through the gas-liquid separation transfer tank 15 to complete gas-liquid phase separation, and the wet grinding residual gas enters the carbon dioxide concentration sensor 16. At this time, the recovery gas control valve 17 and the external gas control valve 21 are in the closed state; the carbon dioxide concentration of the wet grinding residual gas is tested. If the result is higher than the set concentration, the recovery gas control valve 17 is opened and the residual gas is transported to the gas circulation device 18 for recycling as a carbon dioxide gas source; If the result is not higher than the set concentration, the exhaust gas control valve 21 is opened to transport the gas to the gas recovery pool 22 and recover it through the saturated lime water in the pool; the carbonized solid waste slurry separated by the gas-liquid separation transfer tank 15 is input to the carbonized slurry storage tank 20. At this time, the discharge port control valve 24 is in a closed state, and the carbonized solid waste slurry is kept stirred under the rotation of the carbonized slurry agitator 19. When discharge is required, the discharge port control valve 24 is opened, and the carbonized solid waste slurry is output from the discharge port 23 and mixed with solid waste, cement, gypsum, lime, air entraining agent, and foam stabilizer in proportion. The aerated concrete body is turned over, cut according to the specifications of different products, and transported to an autoclave; a hot air furnace is used to provide corresponding processing conditions for autoclaving, and high-concentration carbon dioxide gas provided by a gas circulation system is transported to the autoclave, and the aerated concrete body in the autoclave is autoclaved and cured under a carbon dioxide atmosphere to obtain an autoclaved aerated concrete product; the autoclaved residual gas and the tail gas of the hot air furnace are recovered and transported to the gas circulation system for recycling as a carbon dioxide gas source; the autoclaved aerated concrete product is obtained after it is taken out of the autoclave.

[0039] In combination with the above, the inventive ideas of the process and equipment of the present invention are as follows:

[0040] First, the effective carbon fixation component in solid waste is alkaline earth metal ions, and the efficiency of carbon fixation depends on the Ca 2+ Mg 2+ Plasma dissolution. Rich in CO2 dissolves in aqueous solution to form CO3 2-, and precipitate and crystallize on the particle surface to form a precipitate. Since the silicon-aluminum-oxygen network structure of solid waste has high thermodynamic stability, the internal Ca 2+ Mg 2+ Plasma is difficult to dissolve continuously, and the generated calcium carbonate precipitate and silicon-aluminum colloid completely wrap the solid waste particles, resulting in the dissolution and diffusion of ions being hindered, limiting the carbon fixation efficiency. To this end, the present invention focuses on the method of carbon fixation in a liquid grinding environment. On the one hand, by regulating the concentration and pressure of the gas, optimizing the movement of the gas, intensifying the collision between solid waste particles and grinding balls, and between solid waste particles, while reducing the surface energy of the particles in the liquid medium chemical dissolution environment, achieving efficient refinement under the synergistic effect of gas-liquid-solid three-phase, and improving the grinding efficiency; on the other hand, the efficient depolymerization of solid waste particles provides more effective carbon fixation ions in the solution, increases the alkalinity of the solution, and accelerates the dissolution and precipitation reaction of CO2 in the aqueous solution. At the same time, due to the action of mechanical force, the produced calcium carbonate precipitate and silicon-aluminum colloid migrate into the solution, thereby alleviating the problem of particle wrapping, thereby achieving the purpose of efficient carbon dioxide solidification, and significantly improving the solid waste grinding efficiency and carbon fixation efficiency.

[0041] Secondly, after carbon mineralization modification, more solid waste raw materials can be used for the production of aerated concrete. In the past, the main materials of aerated concrete were fly ash or sand, with auxiliary materials and admixtures such as cement and gypsum. With the development of fly ash utilization technology and the implementation of river sand mining bans in many regions, it is difficult for some areas to obtain raw materials with high cost performance. However, other solid wastes are difficult to produce aerated concrete due to the presence of silicon and aluminum in stable mineral phases. The scheme of the present invention provides a technical idea for carbon mineralization. Through the optimization and regulation of reaction parameters, the gel and crystal phase of C-(A)SH can be effectively depolymerized, thereby promoting the dissolution of active silicon and aluminum components in solid waste, and realizing that steel slag, construction waste powder, fly ash, high calcium fly ash, red mud, slag, magnesium slag, phosphorus slag, and aerated block waste solid waste raw materials can meet the preparation and production of aerated concrete materials.

[0042] However, the current capture and concentration of carbon dioxide faces significant economic costs and energy losses, especially for aerated concrete, a typical indirect production industry, where the carbon dioxide concentration in flue gas is low and difficult to collect. Based on the above ideas, the present invention provides corresponding processes and key equipment, which can directly use the exhaust flue gas through a pipeline for the pretreatment of upstream raw materials. It has good adaptability to flue gas with low carbon dioxide concentrations, solving the problem of difficult to utilize flue gas from aerated concrete production while simultaneously achieving raw material modification, achieving a dual effect.

[0043] Finally, carbon dioxide sequestration will be one of the means of effectively treating carbon dioxide. In response to the demand for carbon dioxide sequestration in industrial parks, the scheme of the present invention is also an effective method for disposing of flue gas in industrial parks or capturing dioxide gas. Flue gas with different carbon dioxide concentrations is utilized in the pretreatment and autoclaving stages of raw materials, and a recycling method is established, thereby promoting the disposal of carbon dioxide-rich flue gas in nearby industrial parks.

[0044] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0045] The present invention provides a carbon sequestration method for autoclaved aerated concrete products. By improving the parameters of the wet grinding process, efficient carbon sequestration of solid waste is achieved. The method is used to prepare autoclaved aerated concrete products. The method not only absorbs industrial flue gas generated during the production of autoclaved aerated concrete products and in chemical parks and captures carbon dioxide gas, but also ensures the performance of the autoclaved aerated concrete products, thereby achieving significant carbon reduction benefits.

[0046] The present invention provides a device for carbon sequestration in autoclaved aerated concrete products, which alleviates the problem of particle encapsulation, thereby achieving efficient carbon dioxide solidification, significantly improving the solid waste grinding efficiency and carbon sequestration efficiency, and enabling the recycling of some raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] FIG1 is a production process flow chart of a carbon sequestration method for autoclaved aerated concrete products;

[0048] FIG2 is a schematic structural diagram of a carbon sequestration device for autoclaved aerated concrete products;

[0049] In the figure: 1. Solid waste raw material supply system; 2. Solid waste raw material recovery system; 3. Feed inlet valve; 4. Solid waste raw material feed inlet; 5. Equipment cleaning discharge port; 6. Equipment cleaning discharge port valve; 7. Mill barrel; 8. Mixing blades; 9. Mill motor; 10. Wear-resistant barrel bottom; 11. Flue gas inlet valve; 12. Flue gas inlet; 13. Cavity; 14. Discharge port; 15. Gas-liquid separation transfer tank; 16. Carbon dioxide concentration sensor; 17. Recovery gas control valve; 18. Gas circulation device; 19. Carbonization slurry agitator; 20. Carbonization slurry storage tank; 21. External exhaust gas control valve; 22. Gas recovery tank; 23. Discharge port; 24. Discharge port valve. DETAILED DESCRIPTION

[0050] The present invention is further illustrated by way of examples below, but the present invention is not limited to the scope of the examples. Experimental methods in the following examples where specific conditions are not specified were performed according to conventional methods and conditions, or selected according to the product specifications.

[0051] The raw materials used in the following examples are derived from the following sources: industrial flue gas is derived from industrial flue gas obtained through preliminary purification from a coal-fired furnace; steel slag is derived from steelmaking waste slag discharged from a steel plant; construction waste fine powder is derived from fine powder screened from a construction waste recycling station; fly ash is derived from a power plant; high-calcium fly ash is derived from fly ash obtained from burning lignite; red mud is derived from waste discharged from aluminum smelting; slag is derived from waste discharged from ironmaking in a steel plant; magnesium slag is derived from waste discharged from magnesium smelting; phosphorus slag is derived from waste discharged from yellow phosphorus smelting in phosphate ore; aerated block waste is derived from waste and defective products in the production process of aerated concrete; nickel slag is derived from waste discharged from nickel-iron alloy smelting; copper slag is derived from waste discharged from copper smelting;

[0052] The main performance test methods and calculation basis of the materials in the following embodiments are as follows: the test methods of absolute dry bulk density and average compressive strength are implemented with reference to standard GB / T11969-2020; the carbon fixation rate is calculated as the weight ratio of CO2-eq absorbed in aerated concrete to the weight of all solid raw materials in the aerated concrete.

[0053] Example 1

[0054] Carbon sequestration methods for autoclaved aerated concrete products:

[0055] (1) Industrial flue gas with a carbon dioxide concentration of 5%, a sulfur dioxide concentration of 2%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.35 MPa through a gas circulation system to obtain pressurized gas; fly ash with a median particle size of 45 μm and a total amount of calcium oxide and silicon oxide of 48 wt.% is mixed with water at a mass ratio of 1:0.8 to obtain a solid waste slurry;

[0056] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 50L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:2, and wet grinding is carried out at a rate of 400 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve into the gas recovery pool for recovery;

[0057] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 110 parts of 42.5 silicate cement, 50 parts of quicklime with a calcium oxide content of 85%, and 20 parts of phosphogypsum with a phosphorus and fluorine content of 1% to the mixer via a belt conveyor; the admixture system mixes 5 parts of aluminum powder passed through an 80-mesh square hole sieve and 0.8 parts of natural saponin and then transports them to the mixer; the above raw materials are stirred at a speed of 350 rpm for 3 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 55°C for 1.5 hours to obtain an aerated concrete body;

[0058] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 85% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 170°C and 1.3 MPa respectively through a steam header, and autoclaved and cured for 10 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0059] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator is 50 rpm during operation.

[0060] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 742 kg / m 3 The average compressive strength is 5.2 MPa, meeting the B07A5.0 bulk density and strength grade specified in the GB / T 11968-2020 standard. Comprehensive measurement and analysis indicate that the product's carbon fixation rate reaches 6.3%, demonstrating excellent carbon retention.

[0061] Example 2

[0062] Carbon sequestration methods for autoclaved aerated concrete products:

[0063] (1) Industrial flue gas having a carbon dioxide concentration of 8%, a sulfur dioxide concentration of 1.7%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.35 MPa through a gas circulation system to obtain pressurized gas; aerated block waste having a median particle size of 300 μm and a total amount of calcium oxide and silicon oxide of 78 wt.% and fly ash having a median particle size of 45 μm and a total amount of calcium oxide and silicon oxide of 48 wt.% are mixed in a mass ratio of 1:1, and the obtained mixture is stirred evenly with water in a mass ratio of 1:1 to obtain a solid waste slurry;

[0064] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 70L / min. Alumina grinding balls with a diameter of 0.4 to 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:1, and wet grinding is carried out at a rate of 400 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve and is recycled as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve to the gas recovery pool for recovery;

[0065] (3) In parts by weight, 240 parts of carbonized solid waste slurry and 240 parts of fly ash without carbonization treatment are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 85%, and 20 parts of phosphogypsum with a phosphorus and fluorine content of 1% to the mixer via a belt conveyor; the admixture system mixes 5 parts of aluminum powder passed through an 80-mesh square hole sieve and 0.8 parts of natural saponin and then transports them to the mixer; the above raw materials are stirred at a speed of 350 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 45°C for 2.5 hours to obtain an aerated concrete body;

[0066] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0067] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator is 50 rpm during operation.

[0068] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 732 kg / m 3 The average compressive strength is 5.3 MPa, meeting the B07A5.0 bulk density and strength grade specified in the GB / T 11968-2020 standard. Comprehensive measurement and analysis show that the carbon fixation rate of the product reaches 9.2%, demonstrating excellent carbon fixation effectiveness.

[0069] Example 3

[0070] Carbon sequestration methods for autoclaved aerated concrete products:

[0071] (1) Industrial flue gas with a carbon dioxide concentration of 16%, a sulfur dioxide concentration of 1.5%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.31 MPa through a gas circulation system to obtain pressurized gas; high-calcium fly ash with a median particle size of 32 μm and a total amount of calcium oxide and silicon oxide of 75 wt.% is mixed with water in a mass ratio of 1:1.5 to obtain a solid waste slurry;

[0072] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 50L / min. Alumina grinding balls with a diameter of 0.4 to 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:1, and wet grinding is carried out at a rate of 400 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve into the gas recovery pool for recovery;

[0073] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 90 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 85%, and 15 parts of phosphogypsum with a phosphorus and fluorine content of 1% to the mixer via a belt conveyor; the admixture system mixes 5 parts of rosin soap foaming agent passed through an 80-mesh square hole sieve and 0.8 parts of natural saponin and then transports them to the mixer; the above raw materials are stirred at a speed of 350 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 45°C for 2.5 hours to obtain an aerated concrete body;

[0074] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0075] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator is 50 rpm during operation.

[0076] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 731 kg / m 3The average compressive strength is 5.1 MPa, meeting the B07A5.0 bulk density and strength grade specified in the GB / T 11968-2020 standard. Comprehensive measurement and analysis show that the carbon fixation rate of the product reaches 14.2%, demonstrating excellent carbon fixation effectiveness.

[0077] Example 4

[0078] Carbon sequestration methods for autoclaved aerated concrete products:

[0079] (1) Industrial flue gas with a carbon dioxide concentration of 22%, a sulfur dioxide concentration of 1.5%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.29 MPa through a gas circulation system to obtain pressurized gas; fly ash with a median particle size of 45 μm and a total amount of calcium oxide and silicon oxide of 48 wt.% and red mud with a median particle size of 56 μm and a total amount of calcium oxide and silicon oxide of 25 wt.% are mixed in a mass ratio of 1:1, and the obtained mixture is stirred evenly with water in a mass ratio of 1:1 to obtain a solid waste slurry;

[0080] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 60L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.4, and wet grinding is carried out at a rate of 400 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve into the gas recovery pool for recovery;

[0081] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 110 parts of 42.5 silicate cement, 50 parts of quicklime with a calcium oxide content of 90%, and 20 parts of phosphogypsum with a phosphorus and fluorine content of 0.5% to the mixer via a belt conveyor; the admixture system mixes 5 parts of aluminum powder passed through an 80-mesh square hole sieve and 1 part of natural saponin and then transports them to the mixer; the above raw materials are stirred at a speed of 350 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 45°C for 2.5 hours to obtain an aerated concrete body;

[0082] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0083] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator is 50 rpm during operation.

[0084] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 589 kg / m 3 The average compressive strength is 4.5 MPa, meeting the B06A3.5 bulk density and strength grade specified in the GB / T 11968-2020 standard. Comprehensive measurement and analysis indicate that the product's carbon fixation rate reaches 13.5%, demonstrating excellent carbon fixation effectiveness.

[0085] Example 5

[0086] Carbon sequestration methods for autoclaved aerated concrete products:

[0087] (1) Industrial flue gas with a carbon dioxide concentration of 30%, a sulfur dioxide concentration of 0.5%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.29 MPa through a gas circulation system to obtain pressurized gas; steel slag with a median particle size of 70 μm and a total amount of calcium oxide and silicon oxide of 69 wt.% and high-calcium fly ash with a median particle size of 32 μm and a total amount of calcium oxide and silicon oxide of 75 wt.% are mixed in a mass ratio of 2:3, and the obtained mixture is mixed with water in a mass ratio of 1:1.1 to obtain a solid waste slurry;

[0088] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 60L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.4, and wet grinding is carried out at a rate of 400 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve into the gas recovery pool for recovery;

[0089] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to a mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of phosphogypsum with a phosphorus and fluorine content of 0.5% to the mixer via a belt conveyor; the admixture system mixes 8 parts of aluminum powder passed through an 80-mesh square hole sieve and 1 part of natural saponin and then transports them to the mixer; the above raw materials are stirred at a speed of 350 rpm for 4 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0090] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0091] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator is 50 rpm during operation.

[0092] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 590 kg / m 3 The average compressive strength is 4.2 MPa, meeting the B06A3.5 bulk density and strength grade specified in the GB / T 11968-2020 standard. Comprehensive measurement and analysis indicate that the product's carbon fixation rate reaches 23.0%, demonstrating excellent carbon fixation effectiveness.

[0093] Example 6

[0094] Carbon sequestration methods for autoclaved aerated concrete products:

[0095] (1) Industrial flue gas with a carbon dioxide concentration of 16%, a sulfur dioxide concentration of 1.5%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.31 MPa through a gas circulation system to obtain pressurized gas; magnesium slag with a median particle size of 62 μm and a total amount of calcium oxide and silicon oxide of 67 wt.% and fly ash with a median particle size of 45 μm and a total amount of calcium oxide and silicon oxide of 48 wt.% are mixed in a mass ratio of 2:3, and the obtained mixture is stirred evenly with water in a mass ratio of 1:1.1 to obtain a solid waste slurry;

[0096] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 60L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.4, and wet grinding is carried out at a rate of 400 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve into the gas recovery pool for recovery;

[0097] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of phosphogypsum with a phosphorus and fluorine content of 0.5% to the mixer via a belt conveyor; the admixture system mixes 8 parts of aluminum powder passed through an 80-mesh square hole sieve and 1 part of natural saponin and then transports them to the mixer; the above raw materials are stirred at a speed of 350 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0098] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0099] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator is 50 rpm during operation.

[0100] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 605 kg / m 3 The average compressive strength is 4.6 MPa, meeting the B06A3.5 bulk density and strength grade specified in the GB / T 11968-2020 standard. Comprehensive measurement and analysis show that the product's carbon fixation rate reaches 16.3%, demonstrating excellent carbon fixation effectiveness.

[0101] Example 7

[0102] Carbon sequestration methods for autoclaved aerated concrete products:

[0103] (1) Industrial flue gas with a carbon dioxide concentration of 16%, a sulfur dioxide concentration of 1.5%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.31 MPa through a gas circulation system to obtain pressurized gas; construction waste fine powder with a median particle size of 205 μm and a total amount of calcium oxide and silicon oxide of 79 wt.% and slag with a median particle size of 75 μm and a total amount of calcium oxide and silicon oxide of 72 wt.% are mixed in a mass ratio of 3:2, and the obtained mixture is stirred evenly with water in a mass ratio of 1:1.1 to obtain a solid waste slurry;

[0104] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 60L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.4, and wet grinding is carried out at a rate of 400 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve into the gas recovery pool for recovery;

[0105] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of phosphogypsum with a phosphorus and fluorine content of 0.5% to the mixer via a belt conveyor; the admixture system mixes 8 parts of sodium lauryl sulfate passed through an 80-mesh square hole sieve and 1 part of natural saponin and transports them to the mixer; the above raw materials are stirred at a speed of 350 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0106] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0107] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator is 50 rpm during operation.

[0108] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 621 kg / m3 The average compressive strength is 4.5 MPa, meeting the B06A3.5 bulk density and strength grade specified in the GB / T 11968-2020 standard. Comprehensive measurement and analysis show that the product's carbon fixation rate reaches 14.2%, demonstrating excellent carbon fixation effectiveness.

[0109] Example 8

[0110] Carbon sequestration methods for autoclaved aerated concrete products:

[0111] (1) Industrial flue gas having a carbon dioxide concentration of 16%, a sulfur dioxide concentration of 1.5%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.31 MPa through a gas circulation system to obtain pressurized gas; construction waste fine powder having a median particle size of 205 μm and a total amount of calcium oxide and silicon oxide of 79 wt.% and phosphorus slag having a median particle size of 146 μm and a total amount of calcium oxide and silicon oxide of 71 wt.% are mixed in a mass ratio of 3:2, and the obtained mixture is stirred evenly with water in a mass ratio of 1:1.1 to obtain a solid waste slurry;

[0112] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 60L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.4, and wet grinding is carried out at a rate of 400 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve into the gas recovery pool for recovery;

[0113] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of phosphogypsum with a phosphorus and fluorine content of 0.5% to the mixer via a belt conveyor; the admixture system mixes 8 parts of fatty alcohol polyoxyethylene ether sodium sulfate passed through an 80-mesh square hole sieve and 1 part of polyacrylamide and then transports them to the mixer; the above raw materials are stirred at a speed of 350 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0114] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 190°C and 0.5 MPa respectively through a steam header, and autoclaved and cured for 10 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0115] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator is 50 rpm during operation.

[0116] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 631 kg / m 3 The average compressive strength is 3.9 MPa, meeting the B06A3.5 bulk density and strength grade specified in the GB / T 11968-2020 standard. Comprehensive measurement and analysis show that the carbon fixation rate of the product reaches 13.8%, demonstrating excellent carbon fixation effectiveness.

[0117] Example 9

[0118] Carbon sequestration methods for autoclaved aerated concrete products:

[0119] (1) Industrial flue gas having a carbon dioxide concentration of 16%, a sulfur dioxide concentration of 1.5%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.31 MPa through a gas circulation system to obtain pressurized gas; nickel slag having a median particle size of 95 μm and a total amount of calcium oxide and silicon oxide of 58 wt.% and copper slag having a median particle size of 175 μm and a total amount of calcium oxide and silicon oxide of 71 wt.% are mixed in a mass ratio of 1:1, and the obtained mixture is stirred evenly with water in a mass ratio of 1:1.1 to obtain a solid waste slurry;

[0120] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 60L / min. Zirconia grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.4, and wet grinding is carried out at a rate of 500 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve into the gas recovery pool for recovery;

[0121] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of phosphogypsum with a phosphorus and fluorine content of 0.5% to the mixer via a belt conveyor; the admixture system mixes 8 parts of aluminum powder passed through an 80-mesh square hole sieve and 1 part of polyacrylamide and then transports them to the mixer; the above raw materials are stirred at a speed of 400 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0122] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0123] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator is 50 rpm during operation.

[0124] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 648 kg / m 3 The average compressive strength is 4.0 MPa, meeting the B06A3.5 bulk density and strength grade specified in the GB / T 11968-2020 standard. Comprehensive measurement and analysis indicate that the product's carbon fixation rate reaches 9.5%, demonstrating excellent carbon fixation effectiveness.

[0125] Example 10

[0126] Carbon sequestration methods for autoclaved aerated concrete products:

[0127] (1) Industrial flue gas with a carbon dioxide concentration of 16%, a sulfur dioxide concentration of 1.5%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.31 MPa through a gas circulation system to obtain pressurized gas; nickel slag with a median particle size of 95 μm and a total amount of calcium oxide and silicon oxide of 58 wt.% is mixed with water in a mass ratio of 1:1.1 to obtain a solid waste slurry;

[0128] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 60L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.4, and wet grinding is carried out at a rate of 500 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve into the gas recovery pool for recovery;

[0129] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of phosphogypsum with a phosphorus and fluorine content of 0.5% to the mixer via a belt conveyor; the admixture system mixes 8 parts of aluminum powder passed through an 80-mesh square hole sieve and 1 part of polyacrylamide and then transports them to the mixer; the above raw materials are stirred at a speed of 400 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0130] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0131] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator is 50 rpm during operation.

[0132] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 634 kg / m 3 The average compressive strength is 3.5 MPa, meeting the B06A3.5 bulk density and strength grade specified in the GB / T 11968-2020 standard. Comprehensive measurement and analysis show that the product's carbon fixation rate reaches 9.3%, demonstrating excellent carbon fixation effectiveness.

[0133] Example 11

[0134] Carbon sequestration methods for autoclaved aerated concrete products:

[0135] (1) Industrial flue gas with a carbon dioxide concentration of 16%, a sulfur dioxide concentration of 1.5%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.31 MPa through a gas circulation system to obtain pressurized gas; copper slag with a median particle size of 75 μm and a total amount of calcium oxide and silicon oxide of 63 wt.% is mixed with water in a mass ratio of 1:1.3 to obtain a solid waste slurry;

[0136] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 60L / min. Alumina grinding balls with a diameter of 0.4 to 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.4, and wet grinding is carried out at a rate of 500rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve and is recycled as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged to the gas recovery pool through the exhaust valve for recovery;

[0137] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of desulfurized gypsum with a phosphorus and fluorine content of 0.43% to the mixer via a belt conveyor; the admixture system mixes 8 parts of aluminum powder passed through an 80-mesh square hole sieve and 1 part of polyacrylamide and then transports them to the mixer; the above raw materials are stirred at a speed of 400 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0138] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0139] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator is 50 rpm during operation.

[0140] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 638 kg / m 3The average compressive strength is 4.3 MPa, meeting the B06A3.5 bulk density and strength grade specified in the GB / T 11968-2020 standard. Comprehensive measurement and analysis show that the product's carbon fixation rate reaches 10.2%, demonstrating excellent carbon fixation effectiveness.

[0141] Example 12

[0142] Carbon sequestration methods for autoclaved aerated concrete products:

[0143] (1) Industrial flue gas with a carbon dioxide concentration of 16%, a sulfur dioxide concentration of 1.5%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.31 MPa through a gas circulation system to obtain pressurized gas; slag with a median particle size of 75 μm and a total amount of calcium oxide and silicon oxide of 72 wt.% and high-calcium fly ash with a median particle size of 32 μm and a total amount of calcium oxide and silicon oxide of 75 wt.% are mixed in a mass ratio of 1:4, and the obtained mixture is mixed with water in a mass ratio of 1:1.3 to obtain a solid waste slurry;

[0144] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 60L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.4, and wet grinding is carried out at a rate of 500 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve into the gas recovery pool for recovery;

[0145] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of desulfurized gypsum with a phosphorus and fluorine content of 0.43% to the mixer via a belt conveyor; the admixture system mixes 8 parts of aluminum powder passed through an 80-mesh square hole sieve and 1 part of polyacrylamide and then transports them to the mixer; the above raw materials are stirred at a speed of 400 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0146] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0147] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator is 50 rpm during operation.

[0148] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 637 kg / m 3 The average compressive strength is 4.1 MPa, meeting the B06A3.5 bulk density and strength grade specified in the GB / T 11968-2020 standard. Comprehensive measurement and analysis show that the carbon fixation rate of the product reaches 19.2%, demonstrating excellent carbon fixation effectiveness.

[0149] Example 13

[0150] Carbon sequestration methods for autoclaved aerated concrete products:

[0151] (1) Industrial flue gas with a carbon dioxide concentration of 16%, a sulfur dioxide concentration of 1.5%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.31 MPa through a gas circulation system to obtain pressurized gas; magnesium slag with a median particle size of 62 μm and a total amount of calcium oxide and silicon oxide of 67 wt.% and high-calcium fly ash with a median particle size of 32 μm and a total amount of calcium oxide and silicon oxide of 75 wt.% are mixed in a mass ratio of 1:4, and the obtained mixture is mixed with water in a mass ratio of 1:1.3 to obtain a solid waste slurry;

[0152] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 60L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.4, and wet grinding is carried out at a rate of 500 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve into the gas recovery pool for recovery;

[0153] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of desulfurized gypsum with a phosphorus and fluorine content of 0.43% to the mixer via a belt conveyor; the admixture system mixes 8 parts of aluminum powder passed through an 80-mesh square hole sieve and 1 part of polyacrylamide and then transports them to the mixer; the above raw materials are stirred at a speed of 400 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0154] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0155] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator is 80 rpm during operation.

[0156] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 631 kg / m 3 The average compressive strength is 4.2 MPa, meeting the A3.5 strength grade in the GB / T 15762-2020 standard. Comprehensive measurement and analysis show that the product's carbon fixation rate reaches 19.2%, demonstrating excellent carbon fixation effectiveness.

[0157] Example 14

[0158] Carbon sequestration methods for autoclaved aerated concrete products:

[0159] (1) Industrial flue gas with a carbon dioxide concentration of 16%, a sulfur dioxide concentration of 1.5%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.31 MPa through a gas circulation system to obtain pressurized gas; steel slag with a median particle size of 70 μm and a total amount of calcium oxide and silicon oxide of 69 wt.% is mixed with water in a mass ratio of 1:1.3 to obtain a solid waste slurry;

[0160] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 60L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.4, and wet grinding is carried out at a rate of 500 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve into the gas recovery pool for recovery;

[0161] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of desulfurized gypsum with a phosphorus and fluorine content of 0.43% to the mixer via a belt conveyor; the admixture system mixes 8 parts of aluminum powder passed through an 80-mesh square hole sieve and 1 part of polyacrylamide and then transports them to the mixer; the above raw materials are stirred at a speed of 400 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0162] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 85% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved curing is carried out for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0163] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator during operation is 100 rpm.

[0164] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 599 kg / m 3 The average compressive strength is 3.8 MPa, meeting the A3.5 strength grade in the GB / T 15762-2020 standard. Comprehensive measurement and analysis show that the carbon fixation rate of the product reaches 24.8%, demonstrating excellent carbon fixation effectiveness.

[0165] Example 15

[0166] Carbon sequestration methods for autoclaved aerated concrete products:

[0167] (1) Industrial flue gas with a carbon dioxide concentration of 40%, a sulfur dioxide concentration of 0.1%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.28 MPa through a gas circulation system to obtain pressurized gas; construction waste fine powder with a median particle size of 205 μm and a total amount of calcium oxide and silicon oxide of 79 wt.% is mixed with water in a mass ratio of 1:1.5 to obtain a solid waste slurry;

[0168] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 60L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.4, and wet grinding is carried out at a rate of 500 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve into the gas recovery pool for recovery;

[0169] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of desulfurized gypsum with a phosphorus and fluorine content of 0.43% to the mixer via a belt conveyor; the admixture system mixes 8 parts of aluminum powder passed through an 80-mesh square hole sieve and 1 part of cellulose ether and then transports them to the mixer; the above raw materials are stirred at a speed of 400 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0170] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0171] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator during operation is 100 rpm.

[0172] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 588 kg / m 3The average compressive strength is 3.7 MPa, meeting the A3.5 strength grade in the GB / T 15762-2020 standard. Comprehensive measurement and analysis show that the carbon fixation rate of the product reaches 21.9%, demonstrating excellent carbon fixation effectiveness.

[0173] Example 16

[0174] Carbon sequestration methods for autoclaved aerated concrete products:

[0175] (1) Industrial flue gas with a carbon dioxide concentration of 65%, a sulfur dioxide concentration of 0.1%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.25 MPa through a gas circulation system to obtain pressurized gas; fly ash with a median particle size of 45 μm and a total amount of calcium oxide and silicon oxide of 48 wt.% is mixed with water in a mass ratio of 1:1.5 to obtain a solid waste slurry;

[0176] (2) The pressurized gas and solid waste slurry are conveyed to the wet grinding equipment through the material pipeline. The conveying rate of the solid waste slurry is 30L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.2, and wet grinding is carried out at a rate of 200 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve and is recycled as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged through the exhaust valve to the gas recovery pool for recovery;

[0177] (3) In parts by weight, 48 parts of carbonized solid waste slurry and 432 parts of fly ash without carbonization treatment are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of desulfurized gypsum with a phosphorus and fluorine content of 0.43% to the mixer via a belt conveyor; the admixture system mixes 8 parts of aluminum powder passed through an 80-mesh square hole sieve and 1 part of cellulose ether and transports them to the mixer; the above raw materials are stirred at a speed of 400 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0178] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0179] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator during operation is 100 rpm.

[0180] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 586 kg / m 3 The average compressive strength is 4.5 MPa, meeting the A3.5 strength grade in the GB / T 15762-2020 standard. Comprehensive measurement and analysis show that the product's carbon fixation rate reaches 6.7%, demonstrating excellent carbon fixation effectiveness.

[0181] Example 17

[0182] Carbon sequestration methods for autoclaved aerated concrete products:

[0183] (1) Industrial flue gas with a carbon dioxide concentration of 79%, a sulfur dioxide concentration of 0.1%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.2 MPa through a gas circulation system to obtain pressurized gas; high-calcium fly ash with a median particle size of 32 μm and a total amount of calcium oxide and silicon oxide of 75 wt.% is mixed with water in a mass ratio of 1:1.3 to obtain a solid waste slurry;

[0184] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 30L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.2, and wet grinding is carried out at a rate of 800 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged into the gas recovery pool through the exhaust valve for recovery;

[0185] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of desulfurized gypsum with a phosphorus and fluorine content of 0.43% to the mixer via a belt conveyor; the admixture system mixes 8 parts of aluminum powder passed through an 80-mesh square hole sieve and 1 part of cellulose ether and transports them to the mixer; the above raw materials are stirred at a speed of 450 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0186] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0187] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator during operation is 100 rpm.

[0188] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 593 kg / m 3 The average compressive strength is 5.3 MPa, meeting the A5.0 strength grade in the GB / T 15762-2020 standard. Comprehensive measurement and analysis show that the carbon fixation rate of the product reaches 15.1%, demonstrating excellent carbon fixation effectiveness.

[0189] Example 18

[0190] Carbon sequestration methods for autoclaved aerated concrete products:

[0191] (1) Industrial flue gas with a carbon dioxide concentration of 99%, a sulfur dioxide concentration of 0%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.2 MPa through a gas circulation system to obtain pressurized gas; high-calcium fly ash with a median particle size of 56 μm and a total amount of calcium oxide and silicon oxide of 25 wt.% is mixed with water in a mass ratio of 1:2 to obtain a solid waste slurry;

[0192] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 30L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.2, and wet grinding is carried out at a rate of 800 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged into the gas recovery pool through the exhaust valve for recovery;

[0193] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 silicate cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of desulfurized gypsum with a phosphorus and fluorine content of 0.43% to the mixer via a belt conveyor; the admixture system mixes 8 parts of aluminum powder passed through an 80-mesh square hole sieve and 1 part of cellulose ether and transports them to the mixer; the above raw materials are stirred at a speed of 450 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0194] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0195] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator during operation is 100 rpm.

[0196] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 642 kg / m 3 The average compressive strength is 3.6 MPa, meeting the A3.5 strength grade in the GB / T 15762-2020 standard. Comprehensive measurement and analysis show that the product's carbon fixation rate reaches 23.5%, demonstrating excellent carbon fixation effectiveness.

[0197] Example 19

[0198] Carbon sequestration methods for autoclaved aerated concrete products:

[0199] (1) Industrial flue gas with a carbon dioxide concentration of 99%, a sulfur dioxide concentration of 0%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.2 MPa through a gas circulation system to obtain pressurized gas; slag with a median particle size of 75 μm and a total amount of calcium oxide and silicon oxide of 72 wt.% is mixed with water in a mass ratio of 1:1.3 to obtain a solid waste slurry;

[0200] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 30L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.2, and wet grinding is carried out at a rate of 800 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged into the gas recovery pool through the exhaust valve for recovery;

[0201] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to a mixer; the auxiliary material system transports 120 parts of 42.5 ordinary Portland cement, 85 parts of quicklime with a calcium oxide content of 90%, and 25 parts of desulfurized gypsum with a phosphorus and fluorine content of 0.43% to the mixer via a belt conveyor; the admixture system mixes 10 parts of aluminum powder passed through an 80-mesh square hole sieve and 1.3 parts of cellulose ether and transports them to the mixer; the above raw materials are stirred at a speed of 450 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0202] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0203] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with two circular holes with a diameter of 1 mm per square centimeter; the rotation speed of the carbonization slurry agitator during operation is 100 rpm.

[0204] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 586 kg / m 3 The average compressive strength is 4.8 MPa, meeting the A3.5 strength grade in the GB / T 15762-2020 standard. Comprehensive measurement and analysis show that the product's carbon fixation rate reaches 10.5%, demonstrating excellent carbon fixation effectiveness.

[0205] Example 20

[0206] Carbon sequestration methods for autoclaved aerated concrete products:

[0207] (1) Industrial flue gas with a carbon dioxide concentration of 99%, a sulfur dioxide concentration of 0%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.2 MPa through a gas circulation system to obtain pressurized gas; magnesium slag with a median particle size of 62 μm and a total amount of calcium oxide and silicon oxide of 67 wt.% is mixed with water in a mass ratio of 1:1.3 to obtain a solid waste slurry;

[0208] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 30L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.2, and wet grinding is carried out at a rate of 800 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged into the gas recovery pool through the exhaust valve for recovery;

[0209] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 ordinary Portland cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of desulfurized gypsum with a phosphorus and fluorine content of 0.43% to the mixer via a belt conveyor; the admixture system mixes 10 parts of aluminum powder passed through an 80-mesh square hole sieve and 1.3 parts of cellulose ether and transports them to the mixer; the above raw materials are stirred at a speed of 450 rpm for 5 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 50°C for 2 hours to obtain an aerated concrete body;

[0210] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0211] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with one circular hole with a diameter of 0.3 mm per square centimeter; the rotation speed of the carbonization slurry agitator during operation is 100 rpm.

[0212] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 492 kg / m 3The average compressive strength is 3.9 MPa, meeting the A3.5 strength grade in the GB / T 15762-2020 standard. Comprehensive measurement and analysis show that the product's carbon fixation rate reaches 23.5%, demonstrating excellent carbon fixation effectiveness.

[0213] Example 21

[0214] Carbon sequestration methods for autoclaved aerated concrete products:

[0215] (1) Industrial flue gas with a carbon dioxide concentration of 99%, a sulfur dioxide concentration of 0%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.2 MPa through a gas circulation system to obtain pressurized gas; magnesium slag with a median particle size of 146 μm and a total amount of calcium oxide and silicon oxide of 71 wt.% is mixed with water in a mass ratio of 1:1.3 to obtain a solid waste slurry;

[0216] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 30L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.2, and wet grinding is carried out at a rate of 800 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged into the gas recovery pool through the exhaust valve for recovery;

[0217] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to the mixer; the auxiliary material system transports 100 parts of 42.5 ordinary Portland cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of desulfurized gypsum with a phosphorus and fluorine content of 0.43% to the mixer via a belt conveyor; the admixture system mixes 10 parts of aluminum powder passed through an 80-mesh square hole sieve and 1.3 parts of cellulose ether and then transports them to the mixer; the above raw materials are stirred at a speed of 450 rpm for 3 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 55°C for 1.5 hours to obtain an aerated concrete body;

[0218] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 180°C and 0.7 MPa respectively through a steam header, and autoclaved and cured for 8 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0219] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with one circular hole with a diameter of 0.3 mm per square centimeter; the rotation speed of the carbonization slurry agitator during operation is 100 rpm.

[0220] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 521 kg / m 3 The average compressive strength is 4.6 MPa, meeting the A3.5 strength grade in the GB / T 15762-2020 standard. Comprehensive measurement and analysis show that the carbon fixation rate of the product reaches 9.9%, demonstrating excellent carbon fixation effectiveness.

[0221] Example 22

[0222] Carbon sequestration methods for autoclaved aerated concrete products:

[0223] (1) Industrial flue gas with a carbon dioxide concentration of 99%, a sulfur dioxide concentration of 0%, and other components meeting the requirements of GB 13223-2011 is pressurized to 0.2 MPa through a gas circulation system to obtain pressurized gas; aerated block waste with a median particle size of 300 μm and a total amount of calcium oxide and silicon oxide of 78 wt.% is mixed with water at a mass ratio of 1:1.3 to obtain a solid waste slurry;

[0224] (2) The pressurized gas and solid waste slurry are transported to the wet grinding equipment through the material pipeline. The transport rate of the solid waste slurry is 30L / min. Alumina grinding balls with a diameter between 0.4 and 5.0 mm are prepared. The grinding balls and solid waste slurry are prepared according to a ball-to-material ratio of 1:0.2, and wet grinding is carried out at a rate of 800 rpm. After continuous grinding, the slurry enters the slurry storage tank through the discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected. For wet grinding residual gas with a carbon dioxide concentration of not less than 5%, it enters the circulation system through the recovery valve for recycling as a carbon dioxide gas source. For wet grinding residual gas with a carbon dioxide concentration of less than 5%, it is discharged into the gas recovery pool through the exhaust valve for recovery;

[0225] (3) In parts by weight, 480 parts of carbonized solid waste slurry are transported to a mixer; the auxiliary material system transports 100 parts of 42.5 ordinary Portland cement, 75 parts of quicklime with a calcium oxide content of 90%, and 20 parts of natural gypsum with a phosphorus and fluorine content of 0.1% to the mixer via a belt conveyor; the admixture system mixes 10 parts of aluminum powder passed through an 80-mesh square hole sieve and 1.3 parts of cellulose ether and then transports them to the mixer; the above raw materials are stirred at a speed of 450 rpm for 3 minutes to obtain a mixed slurry; the mixed slurry is poured into a mold car and cured at 55°C for 1.5 hours to obtain an aerated concrete body;

[0226] (4) The aerated concrete body is turned over, cut according to the specifications of the aerated blocks, and transferred to an autoclave; a gas with a carbon dioxide concentration of 90% is introduced into the autoclave, and the temperature and pressure in the autoclave are controlled to 190°C and 1.3 MPa respectively through a steam header, and autoclaved and cured for 4 hours. The residual gas in the autoclave is recovered to the gas circulation system to obtain an autoclaved aerated concrete block.

[0227] In the process of this embodiment, the wear-resistant bottom of the carbon sequestration equipment used for autoclaved aerated concrete products is provided with five circular holes with a diameter of 0.5 mm per square centimeter; the rotation speed of the carbonization slurry agitator is 100 rpm during operation.

[0228] The autoclaved aerated concrete blocks were sampled and tested, and their absolute dry density was found to be 489 kg / m 3 The average compressive strength is 4.3 MPa, meeting the A3.5 strength grade in the GB / T 15762-2020 standard. Comprehensive measurement and analysis show that the product's carbon fixation rate reaches 17.6%, demonstrating excellent carbon fixation effectiveness.

[0229] Example 23

[0230] The carbon sequestration equipment for autoclaved aerated concrete products includes a solid waste slurry supply and recovery system, a wet carbon fixation grinding system, a gas circulation system and a carbon fixation slurry storage system; the solid waste slurry supply and recovery system includes a solid waste raw material supply system 1, a solid waste raw material recovery system 2, a feed port valve 3, a solid waste raw material feed port 4, an equipment cleaning discharge port 5, and an equipment cleaning discharge port valve 6; the wet carbon fixation grinding system includes a mill barrel 7, a stirring blade 8, a mill motor 9, a wear-resistant barrel bottom 10, a flue gas inlet valve 11, a flue gas inlet 12, a cavity 13, and a discharge port 14; the solid waste raw material feed port 4 is arranged to pass through the bottom end of the mill barrel 7 along a tangential direction, and the inner cavity of the wet carbon fixation grinding system passes through the solid waste raw material feed port 4. It is connected to the solid waste raw material supply system 1, and the solid waste raw material feed port 4 is provided with a feed port valve 3 for controlling its opening and closing state; the stirring blade 8 is arranged along the central axis direction of the mill barrel 7, and the mill motor 9 is arranged at the top of the mill barrel 7. The rotating shaft of the stirring blade 8 passes through the top wall of the mill barrel 7 and is connected to the mill motor 9, and the rotation of the stirring blade 8 is driven by the drive of the mill motor 9; the wear-resistant barrel bottom 10 is an arc-shaped structure made of wear-resistant alloy steel, which is arranged at the bottom of the mill barrel 7, and the height of the contact between the wear-resistant barrel bottom 10 and the inner wall of the mill barrel 7 is not higher than the lower wall height of the solid waste raw material feed port 4; the equipment cleaning discharge port 5 is set at the bottom end of the mill barrel 7 and is connected to the solid waste raw material recovery system 2, and the equipment cleaning discharge port 5 is provided with an equipment cleaning The wash outlet valve 6 is used to control its opening and closing state; the flue gas inlet 12 is set to pass through the bottom end of the mill barrel 7 along the tangential direction, and the height of the upper wall of the flue gas inlet 12 is not higher than the height of the contact point between the wear-resistant barrel bottom 10 and the inner wall of the mill barrel 7. The flue gas inlet 12 is provided with a flue gas inlet valve 11 to control its opening and closing state. The bottom of the wear-resistant barrel 10 and the bottom wall of the mill barrel 7 are surrounded to form a cavity 13, and the discharge port 14 is set to pass through the upper end of the mill barrel 7 along the tangential direction; the gas circulation system includes a gas-liquid separation transfer tank 15, a carbon dioxide concentration sensor 16, a recovery gas control valve 17, a gas circulation device 18, an external exhaust gas control valve 21, and a gas recovery tank 22; the carbon fixation slurry storage system includes a carbonization slurry agitator 19, carbonized slurry storage tank 20, discharge port 23, discharge port control valve 24; the gas-liquid separation transfer tank 15 is connected with the discharge port 14, the carbon dioxide concentration sensor 16, and the carbonized slurry storage tank 20, the carbon dioxide concentration sensor 16 is connected with the gas circulation device 18 and the gas recovery pool 22, and the connection passages of the carbon dioxide concentration sensor 16, the gas circulation device 18, and the gas recovery pool 22 are respectively provided with a recovery gas control valve 17 and an external gas control valve 21 for controlling the opening and closing state of the connection passages; the carbonized slurry agitator 19 is arranged in the inner cavity of the carbonized slurry storage tank 20, and the discharge port 23 is arranged along the tangential direction through the bottom of the carbonized slurry storage tank 20, and the discharge port 23 is provided with a discharge port control valve 24;

[0231] During use, after the carbon dioxide gas source is pressurized by the gas circulation device 18, the flue gas inlet valve 11 is opened to allow it to be input into the wet grinding device through the flue gas inlet 12; the feed port valve 3 is opened, and the solid waste slurry is input into the wet grinding device through the solid waste raw material supply system 1 from the solid waste raw material feed port 4; the power output by the mill motor 9 drives the stirring blade 8 to rotate, so that the carbon dioxide gas source, solid waste slurry and grinding balls are mixed for wet grinding treatment. During the wet grinding treatment, the cleaning discharge port valve 6 is in a closed state, and after continuous production, the gas-liquid mixture is discharged through the discharge port 14; when the wet grinding treatment is completed, the feed port valve 3 is closed, and the equipment cleaning discharge port valve 6 is opened, and the material in the barrel is recovered to the solid waste raw material recovery system 2 through the equipment cleaning discharge port 5; the mixture of carbonized solid waste slurry and wet grinding residual gas output from the discharge port 14 is separated into gas and liquid through the gas-liquid separation transfer tank 15 , the wet grinding residual gas enters the carbon dioxide concentration sensor 16, at which time the recovery gas control valve 17 and the external gas control valve 21 are in a closed state; the carbon dioxide concentration of the wet grinding residual gas is detected, and if the result is higher than the set concentration, the recovery gas control valve 17 is opened to transport it to the gas circulation device 18 for recycling as a carbon dioxide gas source; if the result is not higher than the set concentration, the external gas control valve 21 is opened to transport it to the gas recovery pool 22, and it is recovered through the saturated lime water in the pool; the carbonized solid waste slurry separated by the gas-liquid separation transfer tank 15 is input to the carbonized slurry storage tank 20, at which time the discharge port control valve 24 is in a closed state, and the carbonized solid waste slurry is kept stirred under the rotation of the carbonized slurry agitator 19. When discharging is required, the discharge port control valve 24 is opened to output the carbonized solid waste slurry from the discharge port 23.

[0232] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A carbon sequestration method for autoclaved aerated concrete products, characterized in that: The steps include: (1) The carbon dioxide gas source is pressurized to obtain pressurized gas; solid waste is mixed by water injection to obtain solid waste slurry; (2) The solid waste slurry is subjected to wet grinding treatment under the pressurized gas atmosphere to obtain a carbonized solid waste slurry; after the wet grinding treatment is completed, the carbon dioxide concentration of the wet grinding residual gas is detected, and the wet grinding residual gas with a concentration not lower than a set concentration is collected and recycled as a carbon dioxide gas source, and the wet grinding residual gas with a concentration lower than the set concentration is directly recovered; (3) mixing the carbonized solid waste slurry with the solid waste that has not been carbonized, auxiliary materials, and admixtures, or only mixing the carbonized solid waste slurry with auxiliary materials and admixtures to obtain a mixed slurry; and subjecting the mixed slurry to static curing under set conditions to obtain an aerated concrete body; (4) The aerated concrete body is autoclaved and cured in a carbon dioxide atmosphere of a set concentration to obtain an autoclaved aerated concrete product; after the autoclave curing is completed, the autoclaved residual gas is recovered and recycled as a carbon dioxide gas source.

2. The method according to claim 1, characterized in that: In the step (1), the concentration of carbon dioxide in the carbon dioxide gas source is ≥5%, the concentration of sulfur dioxide is ≤2%, and the contents of other components meet the requirements of GB 13223-2011; the carbon dioxide gas source includes industrial flue gas or captured and recovered carbon dioxide gas; and the pressure of the pressurized gas is 0.2-0.35 MPa.

3. The method according to claim 1, characterized in that: In the step (1), the total content of calcium oxide and silicon oxide in the solid waste is ≥25wt.%; the median particle size of the solid waste is ≤300μm; the solid waste includes at least one of steel slag, construction waste powder, fly ash, high calcium fly ash, red mud, slag, magnesium slag, phosphorus slag, aerated block waste, nickel slag, and copper slag; the mass ratio of the solid waste to water is 1:0.8-5.

4. The method according to claim 1, characterized in that: In the step (2), during the wet grinding treatment, the conveying rate of the solid waste slurry is 30 to 70 L / min, the ball-to-material ratio of the grinding balls to the solid waste slurry is 1:0.2 to 2, and the wet grinding rate is 200 to 800 rpm; wet grinding residual gas with a carbon dioxide concentration ≥5% is collected and recycled as a carbon dioxide gas source, and wet grinding residual gas with a carbon dioxide concentration <5% is directly recovered.

5. The method according to claim 1, characterized in that: In the step (3), the auxiliary materials include cement, lime and gypsum; the admixtures include air entraining agent and foam stabilizer; the cement is silicate cement or ordinary silicate cement, and its strength grade is 42.5; the lime is quicklime, and its calcium oxide content is ≥85%; the gypsum is one of desulfurized gypsum, phosphogypsum and natural gypsum, and its phosphorus and fluorine content is ≤1%; the air entraining agent is one of aluminum powder, sodium lauryl sulfate, sodium polyoxyethylene fatty alcohol ether sulfate and rosin soap foaming agent, and its standard mesh number is ≤80 mesh; the foam stabilizer is one of natural saponin, polyacrylamide and cellulose ether.

6. The method according to claim 5, characterized in that: In parts by weight, the total amount of the solid waste and the carbonization treatment solid waste slurry is 480 parts, of which the amount of carbonization treatment solid waste slurry is 48-480 parts; the amount of cement is 90-120 parts, the amount of lime is 50-85 parts, and the amount of gypsum is 15-25 parts; the amount of air entraining agent is 5-10 parts, and the amount of foam stabilizer is 0.8-1.3 parts.

7. The method according to claim 1, characterized in that: In the step (3), the mixing rate is 350-450 rpm, and the mixing time is 3-5 min; the resting treatment is resting at 45-55° C. for 1.5-2.5 h.

8. The method according to claim 1, characterized in that: In the step (4), the carbon dioxide concentration of the carbon dioxide atmosphere is ≥85%; the temperature of the autoclave curing is 170-190° C., the pressure is 0.5-1.3 MPa, and the autoclave curing time is 4-10 hours.

9. A carbon sequestration device for autoclaved aerated concrete products, comprising a solid waste slurry supply and recovery system, a wet carbon fixation grinding system, a gas circulation system and a carbon fixation slurry storage system, characterized in that: The solid waste slurry supply and recovery system comprises a solid waste raw material supply system (1), a solid waste raw material recovery system (2), a feed inlet valve (3), a solid waste raw material feed inlet (4), an equipment cleaning discharge port (5), and an equipment cleaning discharge port valve (6); The wet carbon fixation grinding system comprises a grinding cylinder (7), a stirring blade (8), a grinding motor (9), a wear-resistant cylinder bottom (10), a smoke inlet valve (11), a smoke inlet (12), a cavity (13), and a discharge port (14); The solid waste raw material feed port (4) is arranged at the bottom end of the mill barrel (7) along the tangential direction, and the inner cavity of the wet solid carbon grinding system is connected to the solid waste raw material supply system (1) through the solid waste raw material feed port (4). The solid waste raw material feed port (4) is provided with a feed port valve (3) for controlling its opening and closing state; the stirring blade (8) is arranged along the central axis direction of the mill barrel (7), and the mill motor (9) is arranged at the top of the mill barrel (7). The rotating shaft of the stirring blade (8) passes through the top wall of the mill barrel (7) and is connected to the mill motor (9), and the stirring blade (8) is driven by the drive of the mill motor (9) to rotate; the wear-resistant barrel bottom (10) is arranged at the bottom of the mill barrel (7), and the height of the contact between the wear-resistant barrel bottom (10) and the inner wall of the mill barrel (7) is not high The height of the lower wall of the solid waste raw material feed port (4) is such that the equipment cleaning discharge port (5) is arranged through the bottom end of the mill barrel (7) and is connected to the solid waste raw material recovery system (2). The equipment cleaning discharge port (5) is provided with an equipment cleaning discharge port valve (6) for controlling its opening and closing state. The smoke inlet (12) is arranged through the bottom end of the mill barrel (7) along the tangential direction. The height of the upper wall of the smoke inlet (12) is not higher than the height of the contact point between the wear-resistant barrel bottom (10) and the inner wall of the mill barrel (7). The smoke inlet (12) is provided with a smoke inlet valve (11) for controlling its opening and closing state. The lower part of the wear-resistant barrel bottom (10) and the bottom wall of the mill barrel (7) are surrounded to form a cavity (13). The discharge port (14) is arranged through the upper end of the mill barrel (7) along the tangential direction. The gas circulation system comprises a gas-liquid separation transfer tank (15), a carbon dioxide concentration sensor (16), a recovery gas control valve (17), a gas circulation device (18), an exhaust gas control valve (21), and a gas recovery pool (22); The carbon fixation slurry storage system comprises a carbonization slurry agitator (19), a carbonization slurry storage tank (20), a discharge port (23), and a discharge port control valve (24); The gas-liquid separation transfer tank (15) is connected to the discharge port (14), the carbon dioxide concentration sensor (16), and the carbonized slurry storage tank (20); the carbon dioxide concentration sensor (16) is connected to the gas circulation device (18) and the gas recovery pool (22); the connection passages between the carbon dioxide concentration sensor (16) and the gas circulation device (18) and the gas recovery pool (22) are respectively provided with a recovery gas control valve (17) and an external exhaust gas control valve (21) for controlling the opening and closing state of the connection passages; the carbonized slurry agitator (19) is arranged in the inner cavity of the carbonized slurry storage tank (20); the discharge port (23) is arranged along the tangential direction through the bottom of the carbonized slurry storage tank (20); and the discharge port (23) is provided with a discharge port control valve (24).

10. The device according to claim 9, characterized in that: The wear-resistant cylinder bottom (10) is an arc-shaped structure made of wear-resistant alloy steel, and is provided with 1 to 5 circular holes with a hole diameter of 0.5 to 3 mm per square centimeter; the rotation speed of the carbonized slurry agitator (19) during operation is ≥50 rpm.

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