System and method for sequestration and utilization of co 2 for concrete mixing plant

Abstract

Disclosed in the present invention are a system and method for sequestration and utilization of CO2 for a concrete mixing plant. The system comprises a slurry-making module, a circulating and grinding module and a material storage and use module. The circulating and grinding module can grind, in the presence of a gas containing CO2 and medium balls, a composite slurry prepared by the slurry-making module, and can cyclically use the gas containing CO2, so as to achieve continuous production of carbon mineralization slurry. The material storage and use module comprises a material storage tank and a stirrer which are connected to each other, the material storage tank being used for receiving and storing the carbon mineralization slurry from a slurry tank, and the stirrer being used for mixing the carbon mineralization slurry to produce commercial concrete. The present invention uses a liquid-phase grinding mechanical force to continuously strip the surfaces of solid waste particles in the composite slurry and uses a chemical dissolution promotion component to improve the diffusion rate of CO2 and Ca2+, thereby completely releasing the carbonization potential of solid wastes, and shortening the carbonization time of traditional non-in-situ mineralization reactions from several hours into within 40 min. The present invention consumes industrial solid wastes and further solidifies CO2 gas, achieving the use of CO2 as gelatinization materials.

Description

A system and method for storing and utilizing CO2 in a concrete mixing station Technical Field

[0001] The present invention relates to the technical field of CO2 storage and utilization, and in particular to a system and method for storing and utilizing CO2 in a concrete mixing station. Background Art

[0002] Ex-situ mineralization technology refers to the process of mineralizing natural calcium magnesium silicate minerals (olivine, serpentine, etc.) and industrial solid waste (fly ash, steel industry waste, waste concrete, etc.) after crushing, screening and other pre-treatment, and then reacting with CO2 gas to permanently seal the final solid product in the form of carbonate, while obtaining high value-added chemical products. Currently, there are mainly the following technical routes:

[0003] (1) Thermally activated CO2 mineralization process. A high-temperature mineralization furnace (650-700°C) is used to react the decomposition product CaO of carbide slag with CO2 in the flue gas to achieve CO2 fixation. Although this technical route can quickly achieve CO2 fixation, the calcium-based preparation process consumes a lot of energy, and the carbon emissions generated are sufficient to offset the fixed CO2. In addition, the preparation process has extremely stringent requirements on the raw materials of carbide slag. Impurities such as silicon, aluminum, and iron oxides in carbide slag have a great impact on the quality of the mineralized product, and the existing pretreatment process is complicated.

[0004] (2) Catalytic activation and mineralization of CO2 process. Recyclable (NH4)2SO4 is used as an auxiliary agent, mixed with blast furnace slag in proportion and activated (350℃~370℃). The NH3 released during the activation process reacts with CO2 in the flue gas to generate ammonium carbonate and ammonium bicarbonate. The calcium and magnesium components leached from the activated slag can react with ammonium bicarbonate and ammonium carbonate to obtain the corresponding mineralized products. The (NH4)2SO4 obtained by evaporation and crystallization of the filtrate after the reaction can be recycled. This technical route realizes the integrated utilization of CO2 capture and storage and blast furnace slag resources, but the mineralization process still requires temperature activation, which increases carbon emissions. At the same time, the calcium and magnesium leaching efficiency is affected by the blast furnace slag crystallization phase. The low concentration of ammonium sulfate in the filtrate increases the energy consumption of ammonium sulfate evaporation and crystallization.

[0005] (3) CO2 mineralization curing concrete process. Through the mineralization reaction between CO2 (usually gas) and the cementitious components and other alkaline calcium and magnesium components in the pre-cured or early hydrated concrete components, carbonate products are formed in the pores and interface structures inside the concrete to achieve CO2 fixation. Compared with the traditional high-energy steam curing (1 to 2 days) or natural curing (28 days) to produce concrete, the use of this technology can shorten the curing time to within a few hours and reduce the carbon dioxide emissions in the concrete production process by 30-40%. However, the carbonization curing of concrete components mainly relies on the penetration of CO□. When the concrete surface is completely carbonized, CO□ will find it difficult to penetrate into the interior of the concrete, especially since the surface of high-strength concrete is very dense, so there are great limitations. Although the permeability of carbon dioxide is improved by pressurization, the pressurization conditions are very harsh.

[0006] (4) CO2 mineralization enhanced recycled aggregate process. Since cement paste is attached to the surface of the aggregate, the calcium and hydrated calcium silicate in it can react with CO2 to generate CaCO3 and silica gel, which fill the pores of the recycled aggregate and improve the performance of the aggregate. Aggregates strengthened by this technical approach can be used to replace natural aggregates in the production of building materials, greatly reducing mineral resources and energy consumption. However, due to the difficulty of penetrating the micropores on the surface of the recycled aggregate and the large diffusion limitation of the product layer, the mineralization efficiency under normal pressure is low, the diffusion and mass transfer rate of the mixed components in concrete is low, the carbonization cost of the recycled aggregate is high, and the economic benefits are low.

[0007] (5) Wet mineralization CO2 process. Dissolve fly ash, construction waste powder and other solid wastes in water and introduce CO2 into the water. 2+ Alkaline components such as CO2 will dissolve into water, and CO2 will ionize into carbonate ions in water, which will react to form carbonate mineral precipitation, achieving the effect of fixing CO2. Although this technical approach transforms the gas-solid two-phase reaction system into a gas-liquid-solid three-phase reaction system, which improves the carbonization efficiency, on the one hand, the Ca2+ dissolved in water such as fly ash and construction waste 2+ After all, alkaline components are a minority. On the other hand, when the surface of the solid waste is gradually carbonized, it will be difficult to continue carbonizing, just like the CO2 mineralization curing concrete process.

[0008] Compared with in-situ mineralization technology, non-in-situ mineralization technology can achieve large-scale CO2 emission reduction and resource utilization of industrial solid waste. It is a process technology with great production applications and promising prospects. However, it is limited by issues such as carbon fixation efficiency and economic cost. It is still in the basic research stage and urgently needs to further improve and optimize reaction conditions, improve process flow and production equipment, reduce process energy consumption, and improve CO2 mineralization efficiency and by-product product yield.

[0009] Furthermore, after nearly two decades of rapid development, China's ready-mixed concrete industry has grown into a trillion-yuan industry. According to incomplete statistics from the China Ready-Mixed Concrete Network, China's total ready-mixed concrete production reached 2.651 billion cubic meters in 2022. Even if 1 cubic meter of concrete can only sequester 20 kg of CO2, this would reduce CO2 emissions by over 50 million tons annually. Using products derived from ex-situ CO2 mineralization to produce concrete holds great promise.

[0010] Summary of the Invention

[0011] In order to solve the technical problems of harsh carbon fixation conditions, low carbon fixation efficiency and low carbon fixation amount in the existing non-in situ mineralized carbon storage and utilization process, the present invention improves the liquid phase grinding process parameters to achieve efficient carbon fixation of natural calcium magnesium silicate minerals and industrial solid waste. When used in the preparation of carbon-fixing commercial concrete, it not only does not affect the existing ready-mixed concrete production process, but also improves the durability of the concrete, and has significant carbon reduction benefits.

[0012] In order to achieve the above-mentioned object, the present invention provides a system for storing and utilizing CO2 in a concrete mixing station, comprising a pulping module, a circulating grinding module, and a material storage application module;

[0013] The pulping module is used to mix waste pulp from a concrete mixing station, natural ore and industrial additives to obtain a composite pulp, and to transport the composite pulp to the circulating grinding module;

[0014] The circulating grinding module includes a grinder, a discharging component and a CO2 circulation component. A stirring element is arranged inside the grinder, and the stirring element includes a hollow rotating shaft and medium balls. The discharging component includes a gas storage bin and a slurry bin arranged in communication with each other, and the gas storage bin is connected to the grinder and the CO2 circulation component in sequence. The gas storage bin is used to provide CO2-containing gas to the CO2 circulation component. The CO2 circulation component is used to transport to the grinder and recover the CO2-containing tail gas during the grinding process of the composite slurry in the grinder under the CO2-containing gas and medium balls. The grinder is used to grind the composite slurry under the CO2-containing gas and medium balls to prepare a carbon mineralized slurry and transport the carbon mineralized slurry to the slurry bin of the discharging component.

[0015] The material storage application module includes a connected storage bin and a mixer. The storage bin is used to receive and store the carbon mineralized slurry from the slurry bin, and the mixer is used to mix the carbon mineralized slurry to prepare commercial concrete.

[0016] Furthermore, the pulping module includes a sand and gravel separator, a sand remover and a pulping machine connected in sequence, the pulping machine includes a body, a pulp outlet on the outside of the body, a feeding port on the top of the body, a first rotating shaft in the middle of the top of the body, and a first motor on the top of the body, the lower end of the first rotating shaft is provided with a rotating blade and extends into the interior of the body, and the upper end of the first rotating shaft is connected to the driving part of the first motor through a bevel gear;

[0017] The grinder includes a cylinder, a feed port at the bottom of the cylinder, a screen inside the cylinder, a sealed operating table at the top of the cylinder, and a stirring element inside the sealed operating table. The feed port is connected to the pulp outlet of the pulper. The screen divides the inner part of the cylinder into a finished product bin above the screen and a grinding bin below the screen. An air inlet is provided on the top of the sealed operating table, and a gas pipeline is provided at the air inlet. The stirring element also includes a second motor and a driving rotating rod. The output end of the second motor is fixedly connected to the driving rotating rod, and the driving rotating rod is fixedly connected to a hollow rotating shaft. The top of the hollow rotating shaft is connected to the gas pipeline, and the lower end of the hollow rotating shaft extends to the grinding bin. Centrifugal blades and evenly distributed air outlets are provided on the hollow rotating shaft of the grinding bin, and a first discharge port is provided on the outside of the finished product bin.

[0018] A slurry inlet is provided on one side of the gas storage bin of the discharging component, and the slurry inlet is connected to the first discharging port of the finished product bin. An air vent and a pressure gauge are provided on the top of the gas storage bin. The CO2 circulation component has a circulation air inlet and a circulation air outlet. The air vent of the gas storage bin is connected to the circulation air inlet of the CO2 circulation component, and the circulation air outlet is connected to the air inlet of the grinder. The slurry bin outlet end of the discharging component is connected to a U-shaped pipe.

[0019] A feed pipe is provided at the upper end of the outer side of the storage bin, and the feed pipe is connected to the U-shaped pipe. A second discharge port is provided at the top of the storage bin, and the second discharge port is connected to the mixer.

[0020] Furthermore, a cooling cylinder is provided outside the cylinder of the grinding machine, and a water inlet is provided at the lower part of the cooling cylinder and a water outlet is provided at the upper part;

[0021] The bottom of the finished product bin of the grinding machine also has an inclination angle of 5 to 15 degrees.

[0022] Furthermore, a weighing instrument is provided at the bottom of the pulping machine body, and a display is provided on the weighing instrument;

[0023] The pulp outlet of the pulping machine is provided with a first electronic valve and a first feeding pump in sequence;

[0024] The feed inlet of the grinder is provided with a second electronic valve and a filter screen in sequence, and the water inlet of the cooling cylinder is provided with a third electronic valve;

[0025] The U-shaped pipeline is sequentially provided with a fourth electronic valve and a second feeding pump;

[0026] Rotary bearings are provided at the upper and lower ends of the storage bin, the rotary bearings are connected to a rotating shaft, a spiral blade is provided at one end of the rotating shaft away from the rotating bearing, and a third feeding pump is provided at the second discharge port.

[0027] Furthermore, it also includes a control module for controlling the pulping module, the circulation grinding module, and the storage application module;

[0028] The control module is electrically connected to the first electronic valve, the second electronic valve, the third electronic valve, the fourth electronic valve, the first feeding pump, the second feeding pump, the third feeding pump, the first motor, the second motor, the CO2 circulation component, the sand and gravel separator, and the sand remover respectively.

[0029] The present invention also provides a method for storing and utilizing CO2 in a concrete mixing station using the above system, comprising the following steps:

[0030] S1, mixing waste slurry from a concrete mixing station, solid waste, natural ore and industrial additives through a pulping machine to obtain a composite slurry;

[0031] S2, feeding the composite slurry into a grinding machine and grinding it in the presence of medium balls;

[0032] S3. After the slurry bin is filled, the grinder is sealed and the CO2-containing gas in the gas storage bin is transported to the grinder using a CO2 circulation component, so that the composite slurry is ground and reacted under the CO2-containing gas and dielectric balls to prepare a carbon mineralized slurry;

[0033] S4, repeating step S3, recycling the CO2-containing gas until the CO2 content is less than 5%, then the gas storage bin provides new CO2-containing gas for grinding reaction, realizing continuous production of carbon mineralization slurry;

[0034] S5. The carbon mineralized slurry is fed into a mixer and mixed with cement, mineral admixtures, aggregates, water and water reducing agent to obtain carbon-fixing commercial concrete.

[0035] Among them, the feeding rate of the grinding process in steps S2 to S4 is 10 to 50 L / min, the residence time in the grinding chamber is not more than 40 minutes, the grinding rate is 150 to 1000 r / min, and the ball-to-material ratio of the dielectric ball to the composite slurry is 1:1 to 5:1.

[0036] Furthermore, the composite slurry has a solid-liquid ratio of 3:1 to 3:17 and a fluidity of 160 to 280 mm;

[0037] The solid waste includes at least one of steel slag, blast furnace slag, high calcium fly ash, electric furnace slag, carbide slag, magnesium slag, biomass ash, cement kiln dust, municipal waste incineration ash, and construction waste powder, and the total mass proportion of CaO, MgO and FeO in the solid waste is ≥10%;

[0038] The natural ore includes at least one of wollastonite, olivine, serpentine, talc, pyroxene and feldspar;

[0039] The CO2 content of the CO2-containing gas is ≥30%, NO x and SO2 concentrations are ≤400mg / m 3 and ≤200 mg / m 3 The carbon dioxide delivery rate is 200-1000L / min. When the pressure of the gas storage tank is 0.18MPa, the gas containing CO2 is delivered. When the pressure of the gas storage tank is ≥0.25MPa, the delivery of the gas containing CO2 is stopped.

[0040] The content of the industrial additives is 0.01-0.2% of the solid mass in the composite slurry, and the industrial additives include at least one of a dispersant, a defoamer, an anti-precipitation agent, a neutralizer, a chelating agent, a solubilizing agent, and a nucleating agent;

[0041] The carbon mineralization slurry has a median particle size of ≤20 μm, a carbonization reaction degree of 10-80%, and a solid-liquid ratio of 4:1-2:11;

[0042] The total power consumption of the continuous production of carbon mineralization slurry is 12 to 80 kW·h.

[0043] In some embodiments of the present invention, the dispersant may be selected from at least one of benzenesulfonic acid formaldehyde complex, benzenesulfonic acid formaldehyde condensate, sodium benzoindene resin sulfonate, and the like.

[0044] In some embodiments of the present invention, the defoaming agent includes at least one of polyoxypropylene polyoxyethylene propylene glycol ether, polyoxypropylene polyoxyethylene propylglycerol ether, and polyoxypropylene polyoxyethylene monobutyl ether.

[0045] In some embodiments of the present invention, the anti-precipitation agent includes at least one of cellulose, lignin, polyacrylic acid and salts thereof.

[0046] In some embodiments of the present invention, the neutralizing agent includes at least one of phosphoric acid, soluble phosphates, glycine, aminosulfonic acid, and the like.

[0047] In some embodiments of the present invention, the chelating agent includes at least one of ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetic acid, phytic acid, and the like.

[0048] In some embodiments of the present invention, the dissolution promoter includes at least one of polyethyleneimine, polypropyleneimine, ethanolammonium nitrate, and the like.

[0049] In some embodiments of the present invention, the nucleating agent includes at least one of monoethanolamine, diethanolamine, triethanolamine, and the like.

[0050] Furthermore, when the solid waste is at least one of steel slag, carbide slag, magnesium slag, construction waste powder, biomass ash, cement kiln dust, and municipal waste incineration ash, the absolute dry mass ratio of the concrete mixing station waste slurry, solid waste, and natural ore is 1:15-65:0-20;

[0051] When the solid waste is at least one of blast furnace slag, high calcium fly ash and electric furnace slag, the absolute dry mass ratio of the concrete mixing station waste slurry, solid waste and natural ore is 1:1-15:0-20.

[0052] Furthermore, the mixing order in step S5 is aggregate, mineral admixture, cement, water, carbon mineralized slurry, and water reducing agent, and the forced mixing time is 10 to 90 seconds;

[0053] The carbon-fixing commercial concrete includes ordinary, underwater, fine stone, anti-seepage and road concrete.

[0054] Furthermore, the ordinary concrete comprises, by mass percentage, 0.5-12.5% ​​of carbon mineralized slurry, 2.5-15% of cement, 3.5-7.5% of mineral admixture, 70.3-83.8% of aggregate, 6.2-7.7% of water, and 0.2-0.8% of water reducer;

[0055] The underwater concrete comprises, by mass percentage, 1.5-12.5% ​​of carbon mineralized slurry, 2.5-15% of cement, 4.5-6.0% of mineral admixture, 71.5-75.9% of aggregate, 6.2-6.4% of water, and 0.4-0.6% of water reducer. The median particle size of the carbon mineralized slurry in the underwater concrete is not greater than 2 μm.

[0056] The fine aggregate concrete comprises, by mass percentage, 0.5-5.6% of carbon mineralized slurry, 2.5-8.1% of cement, 3.5-5.2% of mineral admixture, 80.1-83.8% of aggregate, 6.8-7.7% of water, and 0.3-0.5% of water reducer. The median particle size of the carbon mineralized slurry in the fine aggregate concrete is 10-20 μm.

[0057] The anti-permeability concrete comprises, by mass percentage, 0.7-11.7% of carbon mineralized slurry, 4.3-14.2% of cement, 3.6-7.5% of mineral admixture, 70.3-83.7% of aggregate, 6.2-6.5% of water, and 0.2-0.8% of water reducing agent. The median particle size of the carbon mineralized slurry in the anti-permeability concrete is 2-5 μm.

[0058] The road concrete comprises, by mass percentage, 0.5-5.4% carbon mineralized slurry, 2.5-7.9% cement, 3.5-5.3% mineral admixture, 80.3-83.8% aggregate, 6.8-7.7% water, and 0.2-0.5% water reducer. The median particle size of the carbon mineralized slurry in the road concrete is 6-10 μm.

[0059] Compared with the prior art, the present invention has the following beneficial effects:

[0060] 1. The wet carbonization reaction of alkaline solid waste goes through five processes: ① Ca inside solid particles 2+ Mg 2+ Plasma dissolution; ②CO2 dissolves in aqueous solution to form CO3 2- ; ③ precipitation and crystallization on the particle surface; ④ precipitation in the solution; ⑤ precipitation particles in the solution are adsorbed onto the solid surface. 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 precipitation will further block the pores and even completely wrap the solid waste particles, resulting in Ca 2+ Mg 2+ The diffusion and transport channels of plasma are isolated, which limits the carbon fixation efficiency. The surface of solid waste particles is continuously peeled off by liquid phase grinding mechanical force, while CO2 and Ca are increased by chemical dissolution components. 2+ The diffusion rate is very high, fully releasing the carbonization potential of solid waste. The introduction of large amounts of gas into the liquid-phase grinding environment also provides the conditions for hydraulic cavitation during the rotary mechanical agitation. The high-speed microjets and shock waves generated when the cavitation bubbles collapse cause extreme turbulence and mechanical shear effects that are more conducive to particle refinement, shortening the carbonization time of traditional ex-situ mineralization reactions from several hours to less than 40 minutes.

[0061] 2. Nucleating agents are used to regulate the crystal form of carbon mineralized CaCO3, and the growth of CaCO3 is limited under the action of liquid phase mechanical force. CaCO3 that replaces cement not only has a good morphological effect and improves the flexural and compressive strength of concrete, but can also serve as micro-aggregate to fill pores and improve durability.

[0062] 3. In the process of efficient carbon fixation of solid waste, the solid waste particles are efficiently refined under the impact of solid medium collision, liquid medium chemical dissolution and gas cavitation. This not only changes the actual problem of weak interface connection caused by the many corners and irregular shapes of solid waste particles, but also increases the dissolution of active oxides such as active SiO2 and Al2O3, increases the surface free energy, and improves the reaction activity, which will accelerate the secondary hydration reaction process with calcium hydroxide. As a concrete admixture, it not only improves the early and late strength of cement, but also reduces the alkalinity of the cement system and improves the volume stability and durability of cement.

[0063] 4. Commercial concrete is one of the two trillion-level industries in the building materials field. The global annual consumption of concrete for the construction of houses, water conservancy, transportation, municipal facilities and other projects is measured in tens of billions of tons. Converting concrete, the world's most widely used building material, into the earth's carbon sink resource can not only give full play to the low-carbon and carbon reduction role of concrete materials in the field of engineering construction, but also effectively absorb industrial solid waste and construction waste, and promote green and sustainable development of various industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] FIG1 shows a schematic diagram of a system for storing and utilizing CO2 in a concrete mixing station according to an embodiment;

[0065] FIG2 shows a schematic structural diagram of a system for storing and utilizing CO2 in a concrete mixing station according to an embodiment;

[0066] FIG3 shows a schematic structural diagram of a pulping machine according to an embodiment;

[0067] FIG4 shows a schematic structural diagram of a grinding machine according to an embodiment;

[0068] FIG5 shows a schematic structural diagram of a discharging component in an embodiment;

[0069] FIG6 shows a schematic structural diagram of a storage bin in an embodiment;

[0070] FIG7 shows a schematic diagram of a system for storing and utilizing CO2 in a concrete mixing station according to an embodiment;

[0071] FIG8 shows a graph showing the relationship between the conductivity and time of the composite slurry when ground under different conditions;

[0072] Explanation of the accompanying symbols: 1000, pulping module; 1100, sand and gravel separator; 1200, sand remover; 1300, pulping machine; 1301, machine body; 1302, pulp outlet; 1303, feeding port; 1304, first rotating shaft; 1305, first motor; 1306, rotating blade; 1307, bevel gear; 1308, weighing instrument; 1309, display; 1310, first electronic valve; 2000, circulation grinding module; 2100, grinding machine; 2101, cylinder; 2102, feeding port; 2103, screen; 2104, sealing operation table; 2105, finished product bin; 2106, grinding bin; 2107, gas pipeline; 2108, second motor; 2109, driving rod; 2110, hollow rotating shaft; 2111, centrifugal blade; 211 2. Gas outlet; 2113. First discharge port; 2114. Cooling cylinder; 2115. Water inlet; 2116. Water outlet; 2117. Second electronic valve; 2118. Filter; 2119. Third electronic valve; 2120. Dielectric ball; 2200. Discharge component; 2201. Slurry inlet; 2202. Gas storage bin; 2203. Slurry bin; 2204. Air vent; 2205. Barometer; 2206. Outlet port; 2207. U-shaped pipe; 2208. Fourth electronic valve; 2300. CO2 circulation component; 3000. Storage application module; 3100. Storage bin; 3101. Feed pipe; 3102. Second discharge port; 3103. Rotating shaft; 3104. Spiral blade; 3200. Mixer; 4000. Control module; DETAILED DESCRIPTION

[0073] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to form one or more new numerical ranges, and these numerical ranges should be considered to be specifically disclosed in the present invention.

[0074] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the specific embodiments of the present invention and the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0075] Example 1

[0076] Please refer to Figures 1 to 6. A system for storing and utilizing CO2 in a concrete mixing station includes a pulping module 1000, a circulating grinding module 2000, a storage application module 3000, and a control module 4000. The pulping module 1000 is used to mix waste pulp from the concrete mixing station, natural ore, and industrial additives to obtain a composite slurry, and then transport the composite slurry to the circulating grinding module 2000. The circulating grinding module 2000 includes a grinder 2100, a discharging component 2200, and a CO2 circulation component 2300. A stirring element is provided inside the grinder 2100, and the stirring element includes a hollow rotating shaft 2110 and a medium ball 2120. The discharging component 2200 includes a gas storage bin 2202 and a slurry bin 2203 that are connected to each other. The gas storage bin 2202 is connected to the grinder 2100 and the CO2 circulation component 2300 in sequence. The gas storage bin 2202 is used to supply the CO2 circulation component 2300 with a gas storage bin 2202. 300 provides CO2-containing gas. The CO2 circulation component 2300 is used to transport the gas to the grinder 2100 and recover the CO2-containing exhaust gas generated during the grinding process of the composite slurry in the CO2-containing gas and the media balls 2120 in the grinder 2100. The grinder 2100 is used to grind the composite slurry under the CO2-containing gas and the media balls 2120 to produce carbon mineralized slurry, and then transport the carbon mineralized slurry to the slurry bin 2203 of the discharge component 2200. The storage application module 3000 includes a connected storage bin 3100 and a mixer 3200. The storage bin 3100 is used to receive and store the carbon mineralized slurry in the slurry bin 2203. The mixer 3200 is used to mix the carbon mineralized slurry to produce commercial concrete. The control module 4000 is used to control the slurry production module 1000, the circulating grinding module 2000, and the storage application module 3000.

[0077] 2 , the pulping module 1000 includes a sand and gravel separator 1100, a sand remover 1200 and a pulping machine 1300 connected in sequence. Referring to FIG3 , the pulping machine 1300 includes a body 1301, a pulp outlet 1302 on the outside of the body 1301, a feeding port 1303 at the top of the body 1301, a first rotating shaft 1304 in the middle of the top of the body 1301, and a first motor 1305 at the top of the body 1301. The lower end of the first rotating shaft 1304 is provided with a rotating blade 1306 and extends to the interior of the body 1301. The upper end of the first rotating shaft 1304 is connected to the driving part of the first motor 1305 through a bevel gear 1307. A weighing meter 1308 is also provided at the bottom of the body 1301. A display 1309 is provided on the weighing meter 1308. The pulp outlet 1302 of the pulping machine 1300 is provided with a first electronic valve 1310 and a first feeding pump in sequence. The sand and gravel separator 1100 and the sand remover 1200 can separate the waste slurry generated by ready-mixed concrete production enterprises during the separation of waste concrete, equipment flushing and site flushing of the production area, and obtain a mixed liquid containing more solid particles after sand and gravel separation, namely the waste slurry of the concrete mixing station.

[0078] 4 , the grinding machine 2100 includes a cylinder 2101, a feed port 2102 at the bottom of the cylinder 2101, a screen 2103 inside the cylinder 2101, a sealed operating table 2104 at the top of the cylinder 2101, and a stirring element inside the sealed operating table 2104. The feed port 2102 is connected to the pulp outlet 1302 of the pulping machine 1300. The screen 2103 divides the interior of the cylinder 2101 into a finished product bin 2105 on the screen 2103 and a grinding bin 2106 under the screen 2103. The grinding bin 2106 contains a medium ball 2120. An air inlet is opened at the top of the sealed operating table 2104, and the air inlet is provided with a gas pipeline 2107. The stirring element also includes a second motor 2 108 and a driving rod 2109. The output end of the second motor 2108 is fixedly connected to the driving rod 2109, and the driving rod 2109 is fixedly connected to the hollow rotating shaft 2110. The top of the hollow rotating shaft 2110 is connected to the gas pipeline 2107. The lower end of the hollow rotating shaft 2110 extends to the grinding chamber 2106. Centrifugal blades 2111 and evenly distributed gas outlets 2112 are provided on the hollow rotating shaft 2110 of the grinding chamber 2106. A first discharge port 2113 is provided on the outside of the finished product chamber 2105. In order to control the temperature of the cylinder 2101, a cooling cylinder 2114 is provided on the outside of the cylinder 2101. The cooling cylinder 2114 is provided with a water inlet 2115 at the bottom and a water outlet 2116 at the top, and the temperature is controlled by circulating water. The feed port 2102 of the grinder 2100 is provided with a second electronic valve 2117 and a filter 2118 in sequence, and the water inlet 2115 of the cooling cylinder 2114 is provided with a third electronic valve 2119. The bottom of the finished product bin 2105 of the grinder 2100 also has an inclination angle of 5 to 15 degrees.

[0079] 5 , a slurry inlet 2201 is provided on one side of the gas storage bin 2202 of the discharge component 2200. The slurry inlet 2201 is connected to the first discharge port 2113 of the finished product bin 2105. A vent 2204 and a barometer 2205 are provided on the top of the gas storage bin 2202. The CO2 circulation component 2300 has a circulation inlet and a circulation outlet. The vent 2204 of the gas storage bin 2202 is connected to the circulation inlet of the CO2 circulation component 2300, and the circulation outlet of the CO2 circulation component 2300 is connected to the air inlet of the grinder 2100. The outlet end 2206 of the slurry bin 2203 of the discharge component 2200 is connected to a U-shaped pipe 2207, which is sequentially provided with a fourth electronic valve 2208 and a second feed pump. The gas storage bin 2202 can capture CO2 (gas) from the atmospheric environment and store it, and can also be connected to other equipment containing CO2 gas.

[0080] Referring to Figure 6 , a feed pipe 3101 is provided at the outer upper end of the storage bin 3100. Feed pipe 3101 is connected to U-shaped pipe 2207. A second discharge port 3102 is provided at the top of the storage bin 3100. This second discharge port 3102 is connected to the mixer 3200 and is equipped with a third feed pump. Rotary bearings are provided at both the upper and lower ends of the storage bin 3100. Rotary shaft 3103 is connected to the rotating bearings. A spiral blade 3104 is provided at the end of the rotating shaft 3103 away from the rotating bearings.

[0081] The control module 4000 is electrically connected to the first electronic valve 1310, the second electronic valve 2117, the third electronic valve 2119, the fourth electronic valve 2208, the first feed pump, the second feed pump, the third feed pump, the first motor 1305, the second motor 2108, the CO2 circulation component 2300, the sand and gravel separator 1100, and the sand remover 1200. The control module 4000 is selected as a PLC.

[0082] FIG7 shows a schematic diagram of a system for storing and utilizing CO2 in a concrete mixing plant.

[0083] The following method embodiments all use the concrete mixing station CO2 storage and utilization system of Example 1. When in use, when the pressure of the gas storage tank 2202 is equal to 0.18MPa, the vent 2204 is opened, and the CO2 circulation component 2300 conveys CO2-containing gas to the grinder 2100. When the pressure of the gas storage tank 2202 is greater than 0.25MPa, the CO2 circulation component 2300 stops conveying CO2-containing gas. Concrete mixing station waste slurry is the waste slurry generated by ready-mixed concrete production enterprises during the separation of waste concrete, equipment flushing, and site flushing of the production area, and is processed using a sand and gravel separator 1100 and a sand remover 1200. The mass of the concrete mixing station waste slurry and carbon mineralization slurry refers to the absolute dry mass, and the total mass of CaO, MgO, and FeO in the solid waste accounts for ≥10%. These contents will not be repeated.

[0084] Example 2

[0085] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0086] S1. 1 part by mass of waste slurry from a concrete mixing station, 65 parts by mass of solid waste, and 0.132 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 3:1, and the fluidity is 160 mm.

[0087] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0088] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0089] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. Then, the gas storage tank provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 2 μm; the carbonization reaction degree is 80%, the solid-liquid ratio is 10:3, and the comprehensive power is 60 kW·h

[0090] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain ordinary concrete, which comprises, by mass percentage, 2.0% carbon mineralized slurry, 11.4% cement, 5.4% mineral admixture, 73.9% aggregate, 6.7% water, and 0.6% water reducer.

[0091] In which, the solid waste in step 1 is calcium carbide slag, and the industrial additive is a mixture of a dispersant, a defoaming agent, and an anti-precipitant in a mass ratio of 1:0.1:0.1, wherein the dispersant is formed by mixing a benzenesulfonic acid formaldehyde complex with sodium benzoindene resin sulfonate in a mass ratio of 1:3, the defoaming agent is formed by mixing polyoxypropylene polyoxyethylene propyl glycerol ether in a mass ratio of 1:3, and the anti-precipitant is lignin; the feeding rate of the grinding process in steps S2 to S4 is 10L / min, the grinding chamber residence time is 40min, and the grinding rate is 1000r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 1:1; the gas conveying velocity of the CO2-containing gas in step 3 is 400L / min, and the purity is 99.99%.

[0092] Example 3

[0093] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0094] S1. 1 part by mass of concrete mixing station waste slurry, 65 parts by mass of solid waste, 20 parts by mass of natural ore, and 0.172 parts by mass of industrial additives were mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry was 3:1, and the fluidity was 160 mm.

[0095] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0096] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0097] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. The gas storage tank then provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 4 μm; the carbonization reaction degree is 65%, the solid-liquid ratio is 4:1, and the comprehensive power is 80 kW·h

[0098] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain ordinary concrete, which comprises, by mass percentage, 12.5% ​​carbon mineralized slurry, 2.7% cement, 3.5% mineral admixture, 74.0% aggregate, 6.7% water, and 0.6% water reducer.

[0099] In which, the solid waste in step 1 is steel slag, the natural ore is wollastonite, and the industrial additive is a mixture of a dispersant, a defoaming agent, and an anti-precipitant in a mass ratio of 1:0.1:0.1, wherein the dispersant is composed of a mixture of benzenesulfonic acid formaldehyde condensate and sodium benzoin resin sulfonate in a mass ratio of 2:5, the defoaming agent is composed of a mixture of polyoxypropylene polyoxyethylene propyl glycerol ether and polyoxypropylene polyoxyethylene propyl glycerol ether in a mass ratio of 1:3, and the anti-precipitant is composed of a mixture of cellulose and lignin in a mass ratio of 1:2; the feeding rate of the grinding process in steps S2 to S4 is 10L / min, the grinding chamber residence time is 40min, and the grinding rate is 1000r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 1:1; the gas delivery velocity of the CO2-containing gas in step 3 is 1000L / min, and the purity is 99.99%.

[0100] Example 4

[0101] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0102] S1. 1 part by mass of concrete mixing station waste slurry, 55 parts by mass of solid waste, 15 parts by mass of natural ore, and 0.106 parts by mass of industrial additives were mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry was 1:1, and the fluidity was 200 mm.

[0103] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0104] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0105] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. Then, the gas storage tank provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 2 μm; the carbonization reaction degree is 80%, the solid-liquid ratio is 10:3, and the comprehensive power is 60 kW·h

[0106] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain ordinary concrete, which comprises, by mass percentage, 2.0% carbon mineralized slurry, 2.5% cement, 3.8% mineral admixture, 83.0% aggregate, 7.7% water, and 0.2% water reducer.

[0107] Wherein, in step 1, the solid waste is a mixture of steel slag and carbide slag in a mass ratio of 1:1, the natural ore is a mixture of wollastonite and olivine in a mass ratio of 1:1, and the industrial additive is a mixture of a dispersant, a defoamer, and an anti-precipitant in a mass ratio of 1:0.1:0.1, wherein the dispersant is a mixture of a benzenesulfonic acid formaldehyde complex and sodium benzoindene resin sulfonate in a mass ratio of 1:5, and the defoamer is polyoxypropylene polyoxyethylene propyl glycerol ether and polyoxypropylene polyoxyethylene propyl glycerol. The oil ether is mixed in a mass ratio of 2:3, and the anti-precipitation agent is mixed in a mass ratio of 2:3 of lignin and polyacrylic acid; the feeding rate of the grinding process in steps S2 to S4 is 20L / min, the residence time in the grinding chamber is 10min, and the grinding rate is 800r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 6:5; the gas delivery rate of the CO2-containing gas in step 3 is 400L / min, and the purity is 99.99%.

[0108] Example 5

[0109] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0110] S1. 1 part by mass of concrete mixing station waste slurry, 45 parts by mass of solid waste, 10 parts by mass of natural ore, and 0.056 parts by mass of industrial additives were mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry was 1:2, and the fluidity was 240 mm.

[0111] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0112] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0113] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. The gas storage tank then provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 8 μm; the carbonization reaction degree is 35%, the solid-liquid ratio is 3:5, and the comprehensive power is 18 kW·h

[0114] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain ordinary concrete, which comprises, by mass percentage, 1.0% carbon mineralized slurry, 5.0% cement, 4.0% mineral admixture, 83.0% aggregate, 6.8% water, and 0.2% water reducer.

[0115] In which, the solid waste in step 1 is a mixture of steel slag, construction waste powder and magnesium slag in a mass ratio of 1:1:0.5, the natural ore is a mixture of wollastonite and talc in a mass ratio of 1:1:1, and the industrial additive is a mixture of dispersant, defoamer and anti-precipitant in a mass ratio of 1:0.1:0.1, wherein the dispersant is benzenesulfonic acid formaldehyde condensate, the defoamer is polyoxypropylene polyoxyethylene propyl glycerol ether, and the anti-precipitant is cellulose; the feeding rate of the grinding process in steps S2 to S4 is 30L / min, the grinding chamber residence time is 10min, and the grinding rate is 600r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the CO2-containing gas conveying velocity in step 3 is 600L / min, and the purity is 99.99%.

[0116] Example 6

[0117] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0118] S1. 1 part by mass of concrete mixing station waste slurry, 30 parts by mass of solid waste, 5 parts by mass of natural ore, and 0.018 parts by mass of industrial additives were mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry was 1:3, and the fluidity was 240 mm.

[0119] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0120] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0121] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. The gas storage tank then provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 8 μm; the carbonization reaction degree is 20%, the solid-liquid ratio is 2:5, and the comprehensive power is 16 kW·h

[0122] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain ordinary concrete, which comprises, by mass percentage, 0.5% carbon mineralized slurry, 5.7% cement, 5.1% mineral admixture, 82.0% aggregate, 6.4% water, and 0.3% water reducer.

[0123] In which, the solid waste in step 1 is a mixture of steel slag, construction waste powder and magnesium slag in a mass ratio of 1:1:0.5, the natural ore is a mixture of wollastonite and talc in a mass ratio of 1:1:1, and the industrial additive is a mixture of dispersant, defoamer and anti-precipitant in a mass ratio of 1:0.1:0.1, wherein the dispersant is benzenesulfonic acid formaldehyde condensate, the defoamer is polyoxypropylene polyoxyethylene propyl glycerol ether, and the anti-precipitant is cellulose; the feeding rate of the grinding process in steps S2 to S4 is 40L / min, the grinding chamber residence time is 10min, and the grinding rate is 400r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 4:1; the gas delivery velocity of the CO2-containing gas in step 3 is 800L / min, and the purity is 99.99%.

[0124] Example 7

[0125] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0126] S1. 1 part by mass of waste slurry from a concrete mixing station, 15 parts by mass of solid waste, and 0.008 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:4, and the fluidity is 280 mm.

[0127] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0128] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0129] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. Then, the gas storage bin provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 8 μm; the carbonization reaction degree is 40%, the solid-liquid ratio is 3:10, and the comprehensive power is 16 kW·h

[0130] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain ordinary concrete, which comprises, by mass percentage, 0.5% carbon mineralized slurry, 8.4% cement, 5.6% mineral admixture, 78.5% aggregate, 6.7% water, and 0.3% water reducer.

[0131] In which, the solid waste in step 1 is a mixture of steel slag, construction waste powder and biomass ash in a mass ratio of 1:1:0.5, and the industrial additive is a mixture of dispersant, defoamer and anti-precipitant in a mass ratio of 1:0.1:0.1, wherein the dispersant is a benzenesulfonic acid formaldehyde complex, the defoamer is polyoxypropylene polyoxyethylene monobutyl ether, and the anti-precipitant is lignin; the feeding rate of the grinding process in steps S2 to S4 is 50L / min, the residence time in the grinding chamber is 10min, and the grinding rate is 150r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 5:1; the gas delivery rate of the CO2-containing gas in step 3 is 800L / min, and the purity is 99.99%.

[0132] Example 8

[0133] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0134] S1. 1 part by mass of concrete mixing station waste slurry, 30 parts by mass of solid waste, 5 parts by mass of natural ore, and 0.018 parts by mass of industrial additives were mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry was 3:17, and the fluidity was 280 mm.

[0135] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0136] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0137] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. The gas storage tank then provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 8 μm; the carbonization reaction degree is 10%, the solid-liquid ratio is 2:11, and the comprehensive power is 16 kW·h

[0138] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain ordinary concrete, which comprises, by mass percentage, 0.5% carbon mineralized slurry, 9.1% cement, 6.3% mineral admixture, 77.1% aggregate, 6.7% water, and 0.3% water reducer.

[0139] In which, the solid waste in step 1 is a mixture of construction waste fine powder and kiln dust in a mass ratio of 1:1, the natural ore is a mixture of wollastonite, olivine and pyroxene in a mass ratio of 1:1:1, and the industrial additive is a mixture of dispersant, defoamer and anti-precipitant in a mass ratio of 1:0.1:0.1, wherein the dispersant is benzenesulfonic acid formaldehyde condensate, the defoamer is polyoxypropylene polyoxyethylene propyl glycerol ether, and the anti-precipitant is sodium polyacrylate; the feeding rate of the grinding process in steps S2 to S4 is 50L / min, the grinding chamber residence time is 10min, and the grinding rate is 400r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the CO2-containing gas conveying velocity in step 3 is 600L / min, and the purity is 99.99%.

[0140] Example 9

[0141] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0142] S1. 1 part by mass of concrete mixing station waste slurry, 30 parts by mass of solid waste, 5 parts by mass of natural ore, and 0.018 parts by mass of industrial additives were mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry was 1:2, and the fluidity was 240 mm.

[0143] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0144] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0145] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. The gas storage tank then provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 6 μm; the carbonization reaction degree is 25%, the solid-liquid ratio is 2:3, and the comprehensive power is 12 kW·h

[0146] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain ordinary concrete, which comprises, by mass percentage, 1.0% carbon mineralized slurry, 10.1% cement, 6.4% mineral admixture, 75.4% aggregate, 6.7% water, and 0.4% water reducer.

[0147] In which, the solid waste in step 1 is a mixture of construction waste fine powder and municipal waste incineration ash in a mass ratio of 1:1, the natural ore is a mixture of wollastonite, olivine pyroxene and feldspar in a mass ratio of 1:1:1, and the industrial additive is a mixture of dispersant, defoamer and anti-precipitant in a mass ratio of 1:0.1:0.1, wherein the dispersant is benzenesulfonic acid formaldehyde condensate, the defoamer is polyoxypropylene polyoxyethylene propyl glycerol ether, and the anti-precipitant is cellulose; the feeding rate of the grinding process in steps S2 to S4 is 50L / min, the grinding chamber residence time is 10min, and the grinding rate is 400r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the CO2-containing gas conveying velocity in step 3 is 800L / min, and the purity is 99.99%.

[0148] Example 10

[0149] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0150] S1. 1 part by mass of concrete mixing station waste slurry, 15 parts by mass of solid waste, 20 parts by mass of natural ore, and 0.054 parts by mass of industrial additives were mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry was 3:17, and the fluidity was 280 mm.

[0151] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0152] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0153] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. The gas storage tank then provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 3 μm; the carbonization reaction degree is 50%, the solid-liquid ratio is 5:24, and the comprehensive power is 80 kW·h

[0154] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain ordinary concrete, which comprises, by mass percentage, 0.5% carbon mineralized slurry, 11.3% cement, 6.9% mineral admixture, 74.1% aggregate, 6.7% water, and 0.5% water reducer.

[0155] In which, the solid waste in step 1 is blast furnace slag, the natural ore is wollastonite, and the industrial additive is a mixture of a dispersant, a defoaming agent, and an anti-precipitant in a mass ratio of 1:0.1:0.1, wherein the dispersant is a benzenesulfonic acid formaldehyde condensate, the defoaming agent is polyoxypropylene polyoxyethylene propyl glycerol ether, and the anti-precipitant is cellulose; the feeding rate of the grinding process in steps S2 to S4 is 20 L / min, the grinding chamber residence time is 40 min, and the grinding rate is 600 r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the CO2-containing gas conveying velocity in step 3 is 800 L / min, and the purity is 99.99%.

[0156] Example 11

[0157] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0158] S1. 1 part by mass of concrete mixing station waste slurry, 15 parts by mass of solid waste, 20 parts by mass of natural ore, and 0.054 parts by mass of industrial additives were mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry was 1:2, and the fluidity was 200 mm.

[0159] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0160] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0161] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. The gas storage tank then provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry. The median particle size of the carbon mineralized slurry is 6 μm; the carbonization reaction degree is 25%, the solid-liquid ratio is 7:13, and the total power is 48 kW·h.

[0162] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain ordinary concrete, which comprises, by mass percentage, 0.5% carbon mineralized slurry, 15.0% cement, 7.5% mineral admixture, 70.3% aggregate, 6.2% water, and 0.5% water reducer.

[0163] In which, the solid waste in step 1 is high-calcium fly ash, the natural ore is a mixture of wollastonite and olivine in a mass ratio of 1:1, and the industrial additive is a mixture of dispersant, defoamer, anti-precipitant, chelating agent, and solubilizer in a mass ratio of 1:0.1:0.1:0.2:0.2, wherein the dispersant is benzenesulfonic acid formaldehyde condensate, the defoamer is polyoxypropylene polyoxyethylene propyl glycerol ether, the anti-precipitant is cellulose, the chelating agent is disodium ethylenediaminetetraacetic acid, and the solubilizer is polypropyleneimine; the feeding rate of the grinding process in steps S2 to S4 is 20 L / min, the grinding chamber residence time is 20 min, and the grinding rate is 600 r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the gas delivery velocity of the CO2-containing gas in step 3 is 800 L / min, and the purity is 99.99%.

[0164] Example 12

[0165] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0166] S1. 1 part by mass of concrete mixing station waste slurry, 15 parts by mass of solid waste, 20 parts by mass of natural ore, and 0.054 parts by mass of industrial additives were mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry was 2:1, and the fluidity was 180 mm.

[0167] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0168] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0169] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. Then, the gas storage tank provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 2 μm; the carbonization reaction degree is 80%, the solid-liquid ratio is 10:3, and the comprehensive power is 60 kW·h

[0170] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain ordinary concrete, which comprises, by mass percentage, 10.2% carbon mineralized slurry, 4.0% cement, 6.5% mineral admixture, 72.4% aggregate, 6.3% water, and 0.6% water reducer.

[0171] In which, the solid waste in step 1 is electric furnace slag, the natural ore is a mixture of wollastonite and serpentine in a mass ratio of 1:1, and the industrial additive is a mixture of dispersant, defoamer, anti-precipitant and chelating agent, and solubilizer in a mass ratio of 1:0.1:0.1:0.2:0.2, wherein the dispersant is benzenesulfonic acid formaldehyde condensate, the defoamer is polyoxypropylene polyoxyethylene propyl glycerol ether, the anti-precipitant is cellulose, the chelating agent is disodium ethylenediaminetetraacetic acid, and the solubilizer is polypropyleneimine; the feeding rate of the grinding process in steps S2 to S4 is 20L / min, the grinding chamber residence time is 20min, and the grinding rate is 600r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the gas delivery velocity of the CO2-containing gas in step 3 is 800L / min, and the purity is 99.99%.

[0172] Example 13

[0173] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0174] S1. 1 part by mass of concrete mixing station waste slurry, 10 parts by mass of solid waste, 10 parts by mass of natural ore, and 0.021 parts by mass of industrial additives are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:1, and the fluidity is 200 mm;

[0175] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0176] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0177] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. The gas storage tank then provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 6 μm; the carbonization reaction degree is 30%, the solid-liquid ratio is 2:1, and the comprehensive power is 45 kW·h

[0178] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain ordinary concrete, which comprises, by mass percentage, 6.0% carbon mineralized slurry, 6.3% cement, 6.4% mineral admixture, 74.1% aggregate, 6.7% water, and 0.5% water reducer.

[0179] In which, the solid waste in step 1 is a mixture of blast furnace slag and high-calcium fly ash in a mass ratio of 1:1, and the industrial additive is a mixture of dispersant, defoamer, anti-precipitant, chelating agent, and solubilizer in a mass ratio of 1:0.1:0.1:0.2:0.2, wherein the dispersant is sodium benzoindene resin sulfonate, the defoamer is polyoxypropylene polyoxyethylene monobutyl ether, the anti-precipitant is polyacrylic acid, the chelating agent is ethylenediaminetetraacetic acid, and the solubilizer is ammonium nitrate; the feeding rate of the grinding process in steps S2 to S4 is 20L / min, the grinding chamber residence time is 20min, and the grinding rate is 600r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the gas delivery rate of the CO2-containing gas in step 3 is 800L / min, and the purity is 99.99%.

[0180] Example 14

[0181] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0182] S1. 1 part by mass of waste slurry from a concrete mixing station, 15 parts by mass of solid waste, and 0.016 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:2, and the fluidity is 200 mm.

[0183] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0184] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0185] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. The gas storage tank then provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry. The median particle size of the carbon mineralized slurry is 6 μm; the carbonization reaction degree is 30%, the solid-liquid ratio is 7:13, and the total power is 38 kW·h.

[0186] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain ordinary concrete, which comprises, by mass percentage, 1.0% carbon mineralized slurry, 10.1% cement, 6.4% mineral admixture, 75.4% aggregate, 6.7% water, and 0.4% water reducer.

[0187] In which, the solid waste in step 1 is a mixture of blast furnace slag, high calcium fly ash and electric furnace slag in a mass ratio of 1:1:1, and the industrial additive is a mixture of dispersant, defoamer, anti-precipitant, chelating agent and solubilizer in a mass ratio of 1:0.1:0.1:0.2:0.2, wherein the dispersant is sodium benzoindene resin sulfonate, the defoamer is polyoxypropylene polyoxyethylene monobutyl ether, the anti-precipitant is polyacrylic acid, the chelating agent is ethylenediaminetetraacetic acid, and the solubilizer is ammonium nitrate; the feeding rate of the grinding process in steps S2 to S4 is 20L / min, the grinding chamber residence time is 20min, and the grinding rate is 600r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the gas delivery velocity of the CO2-containing gas in step 3 is 800L / min, and the purity is 99.99%.

[0188] Example 15

[0189] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0190] S1. 1 part by mass of waste slurry from a concrete mixing station, 15 parts by mass of solid waste, and 0.016 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:2, and the fluidity is 200 mm.

[0191] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0192] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0193] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. Then, the gas storage bin provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 6 μm; the carbonization reaction degree is 40%, the solid-liquid ratio is 3:5, and the comprehensive power is 36 kW·h

[0194] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain ordinary concrete, which comprises, by mass percentage, 1.0% carbon mineralized slurry, 14.2% cement, 6.7% mineral admixture, 71.0% aggregate, 6.3% water, and 0.8% water reducer.

[0195] In which, the solid waste in step 1 is a mixture of blast furnace slag and steel slag in a mass ratio of 1:1, and the industrial additive is a mixture of dispersant, defoamer, anti-precipitant, neutralizer, chelating agent, and solubilizer in a mass ratio of 1:0.1:0.1:0.2:0.2:0.2, wherein the dispersant is sodium benzoindene resin sulfonate, the defoamer is polyoxypropylene polyoxyethylene monobutyl ether, the anti-precipitant is polyacrylic acid, the neutralizer is aminosulfonic acid, the chelating agent is ethylenediaminetetraacetic acid, and the solubilizer is ethanolammonium nitrate; the feeding rate of the grinding process in steps S2 to S4 is 20L / min, the grinding chamber residence time is 20min, and the grinding rate is 600r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the gas conveying velocity of the CO2-containing gas in step 3 is 800L / min, and the purity is 99.99%.

[0196] Example 16

[0197] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0198] S1. 1 part by mass of waste slurry from a concrete mixing station, 15 parts by mass of solid waste, and 0.016 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:2, and the fluidity is 160 mm.

[0199] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0200] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0201] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. Then, the gas storage tank provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralization slurry, wherein the median particle size of the carbon mineralization slurry is 1 μm; the carbonization reaction degree is 65%, the solid-liquid ratio is 3:5, and the comprehensive power is 80 kW·h

[0202] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain underwater concrete, which comprises, by mass percentage, 1.5% carbon mineralized slurry, 10.0% cement, 6.0% mineral admixture, 75.9% aggregate, 6.2% water, and 0.4% water reducer.

[0203] In which, the solid waste in step 1 is a mixture of blast furnace slag and steel slag in a mass ratio of 1:1, and the industrial additive is a mixture of a dispersant, a defoamer, an anti-precipitant and a neutralizer in a mass ratio of 1:0.1:0.1:0.2, wherein the dispersant is a mixture of benzenesulfonic acid formaldehyde complex and sodium benzoindene resin sulfonate in a mass ratio of 1:3, the defoamer is a mixture of polyoxypropylene polyoxyethylene propyl glycerol ether in a mass ratio of 1:3, the anti-precipitant is lignin, and the neutralizer is glycine; the feeding rate of the grinding process in steps S2 to S4 is 20L / min, the grinding chamber residence time is 40min, and the grinding rate is 600r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the gas delivery velocity of the CO2-containing gas in step 3 is 800L / min, and the purity is 99.99%.

[0204] Example 17

[0205] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0206] S1. 1 part by mass of waste slurry from a concrete mixing station, 15 parts by mass of solid waste, and 0.016 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:2, and the fluidity is 160 mm.

[0207] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0208] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0209] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. Then, the gas storage tank provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralization slurry, wherein the median particle size of the carbon mineralization slurry is 1 μm; the carbonization reaction degree is 65%, the solid-liquid ratio is 3:5, and the comprehensive power is 80 kW·h

[0210] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain underwater concrete, which comprises, by mass percentage, 1.8% carbon mineralized slurry, 13.4% cement, 5.0% mineral admixture, 73.0% aggregate, 6.3% water, and 0.5% water reducer.

[0211] In which, the solid waste in step 1 is a mixture of blast furnace slag and steel slag in a mass ratio of 1:1, and the industrial additive is a mixture of a dispersant, a defoamer, an anti-precipitant and a neutralizer in a mass ratio of 1:0.1:0.1:0.2, wherein the dispersant is a mixture of benzenesulfonic acid formaldehyde complex and sodium benzoindene resin sulfonate in a mass ratio of 1:3, the defoamer is a mixture of polyoxypropylene polyoxyethylene propyl glycerol ether in a mass ratio of 1:3, the anti-precipitant is lignin, and the neutralizer is glycine; the feeding rate of the grinding process in steps S2 to S4 is 20L / min, the grinding chamber residence time is 40min, and the grinding rate is 600r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the gas delivery velocity of the CO2-containing gas in step 3 is 800L / min, and the purity is 99.99%.

[0212] Example 18

[0213] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0214] S1. 1 part by mass of waste slurry from a concrete mixing station, 15 parts by mass of solid waste, and 0.016 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:2, and the fluidity is 160 mm.

[0215] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0216] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0217] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. Then, the gas storage tank provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralization slurry, wherein the median particle size of the carbon mineralization slurry is 1 μm; the carbonization reaction degree is 65%, the solid-liquid ratio is 3:5, and the comprehensive power is 80 kW·h

[0218] S5. After adding aggregate into the mixer, the storage silo delivers the carbon mineralized slurry into the mixer, and then adds mineral admixture, cement, water, carbon mineralized slurry, and water reducer, and mixes for 50 seconds to obtain underwater concrete, which includes, by mass percentage, 2.0% carbon mineralized slurry, 15.0% cement, 4.5% mineral admixture, 71.5% aggregate, 6.4% water, and 0.6% water reducer.

[0219] In which, the solid waste in step 1 is a mixture of blast furnace slag and steel slag in a mass ratio of 1:1, and the industrial additive is a mixture of a dispersant, a defoamer, an anti-precipitant and a neutralizer in a mass ratio of 1:0.1:0.1:0.2, wherein the dispersant is a mixture of benzenesulfonic acid formaldehyde complex and sodium benzoindene resin sulfonate in a mass ratio of 1:3, the defoamer is a mixture of polyoxypropylene polyoxyethylene propyl glycerol ether in a mass ratio of 1:3, the anti-precipitant is lignin, and the neutralizer is glycine; the feeding rate of the grinding process in steps S2 to S4 is 20L / min, the grinding chamber residence time is 40min, and the grinding rate is 600r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the gas delivery velocity of the CO2-containing gas in step 3 is 800L / min, and the purity is 99.99%.

[0220] Example 19

[0221] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0222] S1. 1 part by mass of waste slurry from a concrete mixing station, 30 parts by mass of solid waste, and 0.0155 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:3, and the fluidity is 280 mm.

[0223] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0224] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0225] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. Then, the gas storage tank provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 10 μm; the carbonization reaction degree is 35%, the solid-liquid ratio is 11:10, and the comprehensive power is 20 kW·h

[0226] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain fine stone concrete, which comprises, by mass percentage, 0.5% carbon mineralized slurry, 2.5% cement, 5.2% mineral admixture, 83.8% aggregate, 7.7% water, and 0.3% water reducer.

[0227] In which, the solid waste in step 1 is calcium carbide slag, and the industrial additive is a mixture of a dispersant, a defoaming agent, and an anti-precipitant in a mass ratio of 1:0.1:0.1, wherein the dispersant is formed by mixing a benzenesulfonic acid formaldehyde complex with sodium benzoindene resin sulfonate in a mass ratio of 1:3, the defoaming agent is formed by mixing polyoxypropylene polyoxyethylene propyl glycerol ether in a mass ratio of 1:3, and the anti-precipitant is lignin; the feeding rate of the grinding process in steps S2 to S4 is 20L / min, the grinding chamber residence time is 10min, and the grinding rate is 600r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the gas conveying velocity of the CO2-containing gas in step 3 is 800L / min, and the purity is 99.99%.

[0228] Example 20

[0229] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0230] S1. 1 part by mass of waste slurry from a concrete mixing station, 30 parts by mass of solid waste, and 0.0155 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:3, and the fluidity is 280 mm.

[0231] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0232] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0233] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. The gas storage tank then provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 15 μm; the carbonization reaction degree is 20%, the solid-liquid ratio is 13:25, and the comprehensive power is 20 kW·h

[0234] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain fine stone concrete, which comprises, by mass percentage, 0.8% carbon mineralized slurry, 5.6% cement, 4.5% mineral admixture, 81.2% aggregate, 7.5% water, and 0.4% water reducer.

[0235] In which, the solid waste in step 1 is steel slag, and the industrial additive is a mixture of a dispersant, a defoaming agent, and an anti-precipitant in a mass ratio of 1:0.1:0.1, wherein the dispersant is a mixture of a benzenesulfonic acid formaldehyde complex and sodium benzoindene resin sulfonate in a mass ratio of 1:3, the defoaming agent is a mixture of polyoxypropylene polyoxyethylene propyl glycerol ether in a mass ratio of 1:3, and the anti-precipitant is lignin; the feeding rate of the grinding process in steps S2 to S4 is 20L / min, the grinding chamber residence time is 10min, and the grinding rate is 600r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the CO2-containing gas conveying velocity in step 3 is 800L / min, and the purity is 99.99%.

[0236] Example 21

[0237] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0238] S1. 1 part by mass of waste slurry from a concrete mixing station, 30 parts by mass of solid waste, and 0.0155 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:3, and the fluidity is 280 mm.

[0239] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0240] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0241] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. The gas storage tank then provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 20 μm; the carbonization reaction degree is 25%, the solid-liquid ratio is 13:25, and the comprehensive power is 18 kW·h

[0242] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain fine stone concrete, which comprises, by mass percentage, 1.0% carbon mineralized slurry, 8.1% cement, 3.5% mineral admixture, 80.1% aggregate, 6.8% water, and 0.5% water reducer.

[0243] Wherein, the solid waste in step 1 is a mixture of steel slag and calcium carbide slag in a mass ratio of 1:1, and the industrial additive is a mixture of a dispersant, a defoaming agent, and an anti-precipitant in a mass ratio of 1:0.1:0.1, wherein the dispersant is formed by mixing a benzenesulfonic acid formaldehyde complex and sodium benzoindene resin sulfonate in a mass ratio of 1:3, the defoaming agent is formed by mixing polyoxypropylene polyoxyethylene propyl glycerol ether in a mass ratio of 1:3, and the anti-precipitant is cellulose; the feeding rate of the grinding process in steps S2 to S4 is 20L / min, the grinding chamber residence time is 10min, and the grinding rate is 600r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the gas conveying velocity of the CO2-containing gas in step 3 is 800L / min, and the purity is 99.99%.

[0244] Example 22

[0245] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0246] S1. 1 part by mass of waste slurry from a concrete mixing station, 15 parts by mass of solid waste, and 0.032 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:2, and the fluidity is 200 mm.

[0247] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0248] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0249] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. Then, the gas storage tank provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 4 μm; the carbonization reaction degree is 40%, the solid-liquid ratio is 3:5, and the comprehensive power is 65 kW·h

[0250] S5. After adding aggregate into the mixer, the storage silo delivers the carbon mineralized slurry into the mixer, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain an impermeable concrete, which comprises, by mass percentage, 0.7% carbon mineralized slurry, 14.2% cement, 7.5% mineral admixture, 70.3% aggregate, 6.5% water, and 0.8% water reducer.

[0251] In which, the solid waste in step 1 is blast furnace slag, and the industrial additive is a mixture of a dispersant, a defoaming agent, an anti-precipitant, a neutralizer, a chelating agent, and a solubilizing agent in a mass ratio of 1:0.1:0.1:0.2:0.1:0.1, wherein the dispersant is a mixture of a benzenesulfonic acid formaldehyde complex and sodium benzoindene resin sulfonate in a mass ratio of 1:3, the defoaming agent is a mixture of polyoxypropylene polyoxyethylene propyl glycerol ether in a mass ratio of 1:3, the anti-precipitant is lignin, the neutralizer is glycine, the chelating agent is ethylenediaminetetraacetic acid, and the solubilizing agent is polypropyleneimine; the feeding rate of the grinding process in steps S2 to S4 is 20 L / min, the grinding chamber residence time is 30 min, and the grinding rate is 600 r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the gas delivery velocity of the CO2-containing gas in step 3 is 800 L / min, and the purity is 99.99%.

[0252] Example 23

[0253] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0254] S1. 1 part by mass of waste slurry from a concrete mixing station, 15 parts by mass of solid waste, and 0.032 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:2, and the fluidity is 200 mm.

[0255] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0256] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0257] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. Then, the gas storage tank provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralization slurry, wherein the median particle size of the carbon mineralization slurry is 5 μm; the carbonization reaction degree is 30%, the solid-liquid ratio is 3:5, and the comprehensive power is 60 kW·h

[0258] S5. After adding aggregate into the mixer, the storage bin delivers the carbon mineralized slurry into the mixer, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain an impermeable concrete, which comprises, by mass percentage, 1.5% carbon mineralized slurry, 10.4% cement, 5.3% mineral admixture, 75.8% aggregate, 6.3% water, and 0.7% water reducer.

[0259] In which, the solid waste in step 1 is calcium carbide slag, and the industrial additive is a mixture of a dispersant, a defoaming agent, and an anti-precipitant in a mass ratio of 1:0.1:0.1, wherein the dispersant is a benzenesulfonic acid formaldehyde condensate, the defoaming agent is polyoxypropylene polyoxyethylene propyl glycerol ether, and the anti-precipitant is cellulose; the feeding rate of the grinding process in steps S2 to S4 is 10L / min, the grinding chamber residence time is 40min, and the grinding rate is 1000r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 1:1; the CO2-containing gas conveying velocity in step 3 is 800L / min, and the purity is 99.99%.

[0260] Example 24

[0261] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0262] S1. 1 part by mass of waste slurry from a concrete mixing station, 15 parts by mass of solid waste, and 0.032 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:2, and the fluidity is 200 mm.

[0263] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0264] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0265] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. The gas storage tank then provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry. The median particle size of the carbon mineralized slurry is 4 μm; the carbonization reaction degree is 35%, the solid-liquid ratio is 3:5, and the total power is 55 kW·h.

[0266] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain an impermeable concrete comprising, by mass percentage, 2.0% carbon mineralized slurry, 4.3% cement, 3.6% mineral admixture, 83.7% aggregate, 6.2% water, and 0.2% water reducer.

[0267] In which, the solid waste in step 1 is high-calcium fly ash, and the industrial additive is a mixture of a dispersant, a defoaming agent, an anti-precipitant, a neutralizer, a chelating agent, and a solubilizing agent in a mass ratio of 1:0.1:0.1:0.2:0.1:0.1, wherein the dispersant is a mixture of a benzenesulfonic acid formaldehyde complex and sodium benzoindene resin sulfonate in a mass ratio of 1:3, the defoaming agent is a mixture of polyoxypropylene polyoxyethylene propyl glycerol ether in a mass ratio of 1:3, the anti-precipitant is lignin, the neutralizer is glycine, the chelating agent is ethylenediaminetetraacetic acid, and the solubilizing agent is polypropyleneimine; the feeding rate of the grinding process in steps S2 to S4 is 20 L / min, the grinding chamber residence time is 30 min, and the grinding rate is 600 r / min; there are medium balls in the grinding chamber of the grinder, and the ball-to-material ratio of the medium balls to the composite slurry is 3:1; the gas delivery velocity of the CO2-containing gas in step 3 is 800 L / min, and the purity is 99.99%.

[0268] Example 25

[0269] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0270] S1. 1 part by mass of waste slurry from a concrete mixing station, 30 parts by mass of solid waste, and 0.0155 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:2, and the fluidity is 200 mm.

[0271] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0272] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0273] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. Then, the gas storage tank provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 8 μm; the carbonization reaction degree is 45%, the solid-liquid ratio is 5:9, and the comprehensive power is 25 kW·h

[0274] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain road concrete, which comprises, by mass percentage, 0.5% carbon mineralized slurry, 2.5% cement, 5.3% mineral admixture, 83.8% aggregate, 7.7% water, and 0.2% water reducer.

[0275] Wherein, the solid waste in step 1 is a mixture of steel slag, construction waste powder and magnesium slag in a mass ratio of 1:1:0.5, and the industrial additive is a mixture of a dispersant, a defoamer, an anti-precipitant, a neutralizer, a chelating agent, a solubilizer and a nucleating agent in a mass ratio of 1:0.1:0.1:0.2:0.1:0.1:0.2, wherein the dispersant is a mixture of a benzenesulfonic acid formaldehyde complex and sodium benzoindene resin sulfonate in a mass ratio of 1:3, and the defoamer is a mixture of polyoxypropylene polyoxyethylene propyl glycerol ether in a mass ratio of 1:3. The invention relates to a method for preparing a composite slurry comprising: a first step of ...

[0276] Example 26

[0277] A method for storing and utilizing CO2 in a concrete mixing station comprises the following steps:

[0278] S1. 1 part by mass of waste slurry from a concrete mixing station, 30 parts by mass of solid waste, and 0.0155 parts by mass of an industrial additive are mixed in a pulping machine to obtain a composite slurry. The solid-liquid ratio of the composite slurry is 1:2, and the fluidity is 200 mm.

[0279] S2, pumping the composite slurry into the grinding machine and grinding it in the presence of dielectric balls, at this time, the fourth electronic valve is closed;

[0280] S3. After the slurry bin is filled, the grinding machine is sealed, the fourth electronic valve is opened, and the CO2 circulation component is used to transport the CO2-containing gas from the gas storage bin to the grinding machine, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare carbon mineralization slurry.

[0281] S4. Repeat step S3 and recycle the CO2-containing gas until the CO2 content is less than 5%. Then, the gas storage tank provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralized slurry, wherein the median particle size of the carbon mineralized slurry is 8 μm; the carbonization reaction degree is 45%, the solid-liquid ratio is 5:9, and the comprehensive power is 25 kW·h

[0282] S5. After adding aggregate into the mixer, the carbon mineralized slurry is fed into the mixer from the storage bin, and then mineral admixtures, cement, water, carbon mineralized slurry, and water reducer are added and mixed for 50 seconds to obtain road concrete, which comprises, by mass percentage, 1.0% carbon mineralized slurry, 7.9% cement, 3.5% mineral admixture, 80.3% aggregate, 6.8% water, and 0.5% water reducer.

[0283] Wherein, the solid waste in step 1 is a mixture of steel slag, construction waste powder and magnesium slag in a mass ratio of 1:1:0.5, and the industrial additive is a mixture of a dispersant, a defoamer, an anti-precipitant, a neutralizer, a chelating agent, a solubilizer and a nucleating agent in a mass ratio of 1:0.1:0.1:0.2:0.1:0.1:0.2, wherein the dispersant is a mixture of a benzenesulfonic acid formaldehyde complex and sodium benzoindene resin sulfonate in a mass ratio of 1:3, and the defoamer is a mixture of polyoxypropylene polyoxyethylene propyl glycerol ether in a mass ratio of 1:3. The invention relates to a method for preparing a composite slurry comprising: a first step of ...

[0284] In order to further illustrate the principle of the present invention, 1 part by mass of concrete mixing station waste slurry and 65 parts by mass of solid waste (steel slag, construction waste fine powder and biomass ash in a mass ratio of 1:1:0.5) were mixed in a pulper to obtain a composite slurry. The solid-liquid ratio of the composite slurry was 1:3 and the fluidity was 240 mm. The composite slurry was then sent to a grinder for grinding with or without the introduction of CO2, and for grinding without or with the introduction of CO2. The mineralization reaction rate under various conditions was judged by testing the electrical conductivity. The more obvious the decrease in conductivity within a certain period of time, the faster the mineralization reaction. The results are shown in Figure 8. In the figure, T-0r: CO2 is passed, grinding is not started, and the ball-to-material ratio of the dielectric ball to the composite slurry is 1:1; N-500r: no CO2 is passed, the rotation speed is 500rpm, and the ball-to-material ratio of the dielectric ball to the composite slurry is 1:1; T-300r-1: CO2 is passed, the rotation speed is 300rpm, and the ball-to-material ratio of the dielectric ball to the composite slurry is 1:1; T-300r-1: CO2 is passed, the rotation speed is 300rpm, and the ball-to-material ratio of the dielectric ball to the composite slurry is 1:1; T-5 00r-1: CO2 is passed, the rotation speed is 500rpm, and the ball-to-material ratio of the medium ball to the composite slurry is 1:1; T-700r-1: CO2 is passed, the rotation speed is 700rpm, and the ball-to-material ratio of the medium ball to the composite slurry is 1:1; T-500r-2: CO2 is passed, the rotation speed is 500rpm, and the ball-to-material ratio of the medium ball to the composite slurry is 2:1; T-500r-3: CO2 is passed, the rotation speed is 500rpm, and the ball-to-material ratio of the medium ball to the composite slurry is 3:1. As can be seen from Figure 8, only when CO2 is passed and the medium balls are present during grinding can the carbonization time of the mineralization reaction be shortened. This is because the rotating mechanical stirring provides the conditions for hydraulic cavitation. When the cavitation bubble collapses, the high-speed micro-jet and shock wave generated will cause extreme turbulence and mechanical shear effect, which is more conducive to particle refinement. At the same time, the surface of the solid waste particles is continuously peeled off by the mechanical force of liquid phase grinding, and the chemical dissolution components are used to increase the CO2 and Ca 2+ The diffusion rate is very fast, which fully releases the carbonization potential of solid waste. In addition, the mineralization reaction time can be further optimized by adjusting the appropriate ball-to-material ratio and grinding speed.

[0285] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A system for storing and utilizing CO2 in a concrete mixing station, characterized in that: Including pulping module, circulation grinding module, storage application module; The pulping module is used to mix the waste pulp from the concrete mixing station, natural ore and industrial additives to obtain a composite pulp, and to transport the composite pulp to the circulation grinding module; The circulating grinding module includes a grinder, a discharging component and a CO2 circulating component. A stirring element is arranged inside the grinder, and the stirring element includes a hollow rotating shaft and medium balls. The discharging component includes a gas storage bin and a slurry bin which are arranged in communication with each other up and down. The gas storage bin is connected to the grinder and the CO2 circulating component in sequence. The gas storage bin is used to provide CO2-containing gas to the CO2 circulating component. The CO2 circulating component is used to transport to the grinder and recover the CO2-containing tail gas in the grinding process of the composite slurry in the grinder under the CO2-containing gas and medium balls. The grinder is used to grind the composite slurry under the CO2-containing gas and medium balls to prepare a carbon mineralized slurry and transport the carbon mineralized slurry to the slurry bin of the discharging component. The material storage application module includes a connected storage bin and a mixer, wherein the storage bin is used to receive and store the carbon mineralized slurry in the slurry bin, and the mixer is used to mix the carbon mineralized slurry to prepare commercial concrete; The pulping module comprises a sand and gravel separator, a sand remover and a pulping machine which are connected in sequence, and the pulping machine comprises a body, a pulp outlet on the outside of the body, a feeding port on the top of the body, a first rotating shaft in the middle of the top of the body, and a first motor on the top of the body, wherein the lower end of the first rotating shaft is provided with a rotating blade and extends to the inside of the body, and the upper end of the first rotating shaft is connected to the driving part of the first motor through a bevel gear; The grinding machine includes a cylinder, a feed port at the bottom of the cylinder, a screen in the cylinder, a sealed operating table at the top of the cylinder, and a stirring element in the sealed operating table. The feed port is connected to the pulp outlet of the pulping machine. The screen divides the inner part of the cylinder into a finished product bin above the screen and a grinding bin below the screen. An air inlet is provided on the top of the sealed operating table, and a gas pipeline is provided at the air inlet. The stirring element also includes a second motor and a driving rotating rod. The output end of the second motor is fixedly connected to the driving rotating rod, and the driving rotating rod is fixedly connected to a hollow rotating shaft. The top of the hollow rotating shaft is connected to the gas pipeline, and the lower end of the hollow rotating shaft extends to the grinding bin. Centrifugal blades and evenly distributed air outlets are provided on the hollow rotating shaft of the grinding bin, and a first discharge port is provided on the outer side of the finished product bin. A slurry inlet is provided on one side of the gas storage bin of the discharging component, and the slurry inlet is connected to the first discharging port of the finished product bin. A gas vent and a pressure gauge are provided on the top of the gas storage bin. The CO2 circulation component has a circulation air inlet and a circulation air outlet. The gas vent of the gas storage bin is connected to the circulation air inlet of the CO2 circulation component, and the circulation air outlet is connected to the air inlet of the grinder. The outlet end of the slurry bin of the discharging component is connected to a U-shaped pipe. A feed pipe is arranged at the upper end of the outer side of the storage bin, and the feed pipe is connected to the U-shaped pipe. A second discharge port is arranged at the top end of the storage bin, and the second discharge port is connected to the mixer.

2. The system for storing and utilizing CO2 in a concrete mixing plant according to claim 1 is characterized in that: A cooling cylinder is arranged outside the cylinder of the grinding machine, a water inlet is arranged at the bottom of the cooling cylinder, and a water outlet is arranged at the top of the cooling cylinder; The bottom of the finished product bin of the grinding machine also has an inclination angle of 5 to 15 degrees.

3. The system for storing and utilizing CO2 in a concrete mixing plant according to claim 2 is characterized in that: The bottom of the pulping machine is also provided with a weighing instrument, on which there is a display; The pulp outlet of the pulping machine is provided with a first electronic valve and a first feeding pump in sequence; The feed inlet of the grinder is provided with a second electronic valve and a filter screen in sequence, and the water inlet of the cooling cylinder is provided with a third electronic valve; The U-shaped pipeline is sequentially provided with a fourth electronic valve and a second feeding pump; Rotary bearings are arranged at the upper and lower ends of the storage bin, the rotary bearings are connected to a rotating shaft, a spiral blade is arranged at one end of the rotating shaft away from the rotating bearing, and a third feeding pump is arranged at the second discharge port.

4. The system for storing and utilizing CO2 in a concrete mixing plant according to claim 3 is characterized in that: It also includes a control module for controlling a pulping module, a circulating grinding module, and a storage application module; The control module is electrically connected to the first electronic valve, the second electronic valve, the third electronic valve, the fourth electronic valve, the first feeding pump, the second feeding pump, the third feeding pump, the first motor, the second motor, the CO2 circulation component, the sand and gravel separator, and the sand remover respectively.

5. A method for storing and utilizing CO2 in a concrete mixing plant using the system of claim 4, characterized in that: The following steps are included: S1. Mixing waste slurry from a concrete mixing station, solid waste, natural ore and industrial additives through a pulping machine to obtain a composite slurry; S2, feeding the composite slurry into a grinding machine and grinding it in the presence of medium balls; S3, after the slurry bin is filled, the grinder is sealed, and the CO2-containing gas in the gas storage bin is transported to the grinder using a CO2 circulation component, so that the composite slurry is ground and reacted under the CO2-containing gas and the medium balls to prepare a carbon mineralization slurry; S4, repeating step S3, recycling the CO2-containing gas until the CO2 content is less than 5%, and then the gas storage bin provides new CO2-containing gas for grinding reaction to achieve continuous production of carbon mineralization slurry; S5, sending the carbon mineralized slurry into a mixer, mixing it with cement, mineral admixtures, aggregates, water, and water reducing agent to obtain carbon-fixing commercial concrete, Among them, the feeding rate of the grinding process in steps S2 to S4 is 10 to 50 L / min, the residence time in the grinding chamber is not more than 40 min, the grinding rate is 150 to 1000 r / min, and the ball-to-material ratio of the medium ball to the composite slurry is 1:1 to 5:

1.

6. The method for storing and utilizing CO2 in a concrete mixing station according to claim 5 is characterized in that: The composite slurry has a solid-liquid ratio of 3:1 to 3:17 and a fluidity of 160 to 280 mm; The solid waste includes at least one of steel slag, blast furnace slag, high calcium fly ash, electric furnace slag, carbide slag, magnesium slag, biomass ash, cement kiln ash, municipal waste incineration ash, and construction waste powder, and the total mass proportion of CaO, MgO and FeO in the solid waste is ≥10%; The natural ore includes at least one of wollastonite, olivine, serpentine, talc, pyroxene and feldspar; The CO2 content of the CO2-containing gas is ≥ 30%, NO x and SO2 concentrations are ≤400mg / m 3 and ≤200 mg / m 3 , the carbon dioxide delivery rate is 200~1000L / min, when the pressure of the gas storage tank is 0.18MPa, the gas containing CO2 is delivered, and when the pressure of the gas storage tank is ≥0.25MPa, the delivery of the gas containing CO2 is stopped; The content of the industrial additives is 0.01-0.2% of the solid mass in the composite slurry. The industrial additives include dispersants, defoamers, At least one of a precipitant, a neutralizer, a chelating agent, a solubilizing agent, and a nucleating agent; The carbon mineralization slurry has a median particle size of ≤20 μm, a carbonization reaction degree of 10 to 80%, and a solid-liquid ratio of 4:1 to 2:11; The comprehensive power consumption of the continuous production of carbon mineralization slurry is 12 to 80 kW·h.

7. The method for storing and utilizing CO2 in a concrete mixing plant according to claim 6, characterized in that: When the solid waste is at least one of steel slag, carbide slag, magnesium slag, construction waste powder, biomass ash, cement kiln ash, and municipal waste incineration ash, the absolute dry mass ratio of the concrete mixing station waste slurry, solid waste, and natural ore is 1:15-65:0-20; When the solid waste is at least one of blast furnace slag, high calcium fly ash and electric furnace slag, the absolute dry mass ratio of the concrete mixing station waste slurry, the solid waste and the natural ore is 1:1-15:0-20.

8. The method for storing and utilizing CO2 in a concrete mixing plant according to claim 7, characterized in that: The mixing order in step S5 is aggregate, mineral admixture, cement, water, carbon mineralization slurry, and water reducing agent, and the forced mixing time is 10 to 90 seconds; The carbon-fixing commercial concrete includes ordinary, underwater, fine stone, impermeable and road concrete.

9. The method for storing and utilizing CO2 in a concrete mixing plant according to claim 8, characterized in that: Ordinary concrete includes, by mass percentage, 0.5-12.5% ​​of carbon mineralized paste, 2.5-15% of cement, 3.5-7.5% of mineral admixture, 70.3-83.8% of aggregate, 6.2-7.7% of water, and 0.2-0.8% of water reducing agent; The underwater concrete comprises, by mass percentage, 1.5-12.5% ​​of carbon mineralized slurry, 2.5-15% of cement, 4.5-6.0% of mineral admixture, 71.5-75.9% of aggregate, 6.2-6.4% of water, 0.4-0.6% of water reducing agent, and the median particle size of the carbon mineralized slurry in the underwater concrete is not greater than 2 μm; The fine stone concrete comprises, by mass percentage, 0.5-5.6% of carbon mineralized slurry, 2.5-8.1% of cement, 3.5-5.2% of mineral admixture, 80.1-83.8% of aggregate, 6.8-7.7% of water, 0.3-0.5% of water reducing agent, and the median particle size of the carbon mineralized slurry in the fine stone concrete is 10-20 μm; The impermeable concrete comprises, by mass percentage, 0.7-11.7% of carbon mineralized slurry, 4.3-14.2% of cement, 3.6-7.5% of mineral admixture, 70.3-83.7% of aggregate, 6.2-6.5% of water, 0.2-0.8% of water reducing agent, and the median particle size of the carbon mineralized slurry in the impermeable concrete is 2-5 μm; The road concrete includes, by mass percentage, 0.5-5.4% of carbon mineralized slurry, 2.5-7.9% of cement, 3.5-5.3% of mineral admixture, 80.3-83.8% of aggregate, 6.8-7.7% of water, and 0.2-0.5% of water reducing agent. The median particle size of the carbon mineralized slurry in the road concrete is 6-10 μm.

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