An article for absorbing sequestering carbon dioxide and a method of making and using the same

Abstract

This invention provides a product for absorbing and solidifying carbon dioxide, obtained by casting a slurry. The slurry comprises steel slag, activated carbon, cement, quartz sand, a water-reducing agent, and a reinforcing agent. The mass ratio of steel slag, activated carbon, cement, and quartz sand is (110-140):(30-50):(15-30):(1-35). The mixed dry pellets prepared by this invention utilize steel slag and activated carbon as raw materials, enabling continuous adsorption of carbon dioxide and increasing the carbon dioxide absorption capacity. During product curing and subsequent use, the adsorbed carbon dioxide is slowly released, reacting internally with the steel slag to achieve more uniform carbonization. The carbon dioxide is converted into calcium carbonate through the reaction, preventing its slow release into the external environment as a gas. Simultaneously, the dry pellets also act as aggregate, forming a dense network structure and enhancing the mechanical properties of the product. This invention also provides a method for preparing and applying the product for absorbing and solidifying carbon dioxide.

Description

Technical Field

[0001] This invention belongs to the field of building materials technology, and in particular relates to a product for absorbing and consolidating carbon dioxide, its preparation method and application. Background Technology

[0002] China has pledged to the international community a "dual carbon" goal: peaking carbon emissions by 2030 and achieving carbon neutrality by 2060. CO2 adsorption materials are one of the goals in achieving this "dual carbon" objective.

[0003] Currently, activated carbon is widely used to adsorb carbon dioxide. However, conventional activated carbon is quite sensitive to temperature and humidity. Higher temperatures can cause thermal expansion and contraction of the air inside the activated carbon. For example, exposure to sunlight can increase the air volume, squeezing out odor molecules or waste gases. Then, the adsorbed substances inside the activated carbon are collected and treated, increasing the cost of waste gas treatment. Furthermore, activated carbon has a strong adsorption capacity for humid gases, rendering it unusable and wasting resources. Finally, the lifespan of activated carbon is approximately 6-12 months. If used activated carbon is not properly disposed of, it will pose a significant environmental safety hazard. Many companies often leave used activated carbon exposed to the air, causing saturated activated carbon to release the adsorbed waste gases again, causing secondary air pollution. Alternatively, improper storage conditions can lead to seepage and diffusion, resulting in secondary pollution of water and soil. Therefore, used activated carbon becomes a new source of environmental toxicity, posing a significant threat to the natural and working environments.

[0004] Therefore, there is an urgent need to propose a technical solution that can both solidify waste gas and utilize it after adsorption saturation. Summary of the Invention

[0005] The purpose of this invention is to provide a product for absorbing and solidifying carbon dioxide, a preparation method thereon, and an application thereof. The product of this invention can absorb and solidify carbon dioxide, and the carbonized product has excellent mechanical properties and can be applied in the construction field.

[0006] This invention provides an article for absorbing and solidifying carbon dioxide, which is obtained by casting a slurry.

[0007] The grouting material includes steel slag, activated carbon, cement, quartz sand, water-reducing agent, and reinforcing agent;

[0008] The mass ratio of the steel slag, activated carbon, cement and quartz sand is (110-140):(30-50):(15-30):(1-35).

[0009] Preferably, the steel slag includes, but is not limited to, tricalcium silicate, dicalcium silicate, dicalcium ferrite, RO and free lime;

[0010] R is one or more of iron, manganese and magnesium.

[0011] Preferably, the water-reducing agent is one or more of the following: naphthalene-based high-efficiency water-reducing agent, aliphatic high-efficiency water-reducing agent, amino high-efficiency water-reducing agent, polycarboxylate high-performance water-reducing agent; and the reinforcing agent is one or more of the following: magnesium sulfate, potassium chloride, and sodium chloride.

[0012] This invention provides a method for preparing an article of absorbing and solidifying carbon dioxide as described above, comprising the following steps:

[0013] A) Mix and ball-mill steel slag (40-65% of the total mass of steel slag) and activated carbon (50-80% of the total mass of activated carbon) to obtain mixed dry ball material;

[0014] The remaining steel slag, remaining activated carbon, cement, and quartz sand are mixed to obtain a mixed dry material;

[0015] B) The mixed dry pellets and mixed dry materials are mixed with the mixed solution to obtain the casting slurry;

[0016] The mixed solution includes a water-reducing agent and a reinforcing agent;

[0017] C) The slurry is poured into a mold to form a rough blank;

[0018] D) The rough blank is coated, dried, and then coated again, wherein the number of layers of multi-layer coating is not less than 3;

[0019] E) The rough blank after patina formation is carbonized and cured to obtain the finished product.

[0020] Preferably, in step A), the mass ratio of steel slag to activated carbon in preparing the mixed dry pellets is (60-70):(25-40).

[0021] Preferably, the mass ratio of the remaining steel slag, remaining activated carbon, cement and quartz sand in step A) is (50-70):(5-10):(15-30):(1-35).

[0022] Preferably, step C) is:

[0023] The slurry is poured into a mold and sealed for curing for 12 to 24 hours to obtain a rough blank.

[0024] Preferably, the drying time in step D) is 12 to 24 hours, and the drying temperature is 80 to 100°C.

[0025] Preferably, the coating material is a finely ground mixture of steel slag, cement, and quartz sand.

[0026] Preferably, the carbonization conditions are a carbon dioxide concentration of 10-100% and a time of 6-48 hours.

[0027] This invention provides the application of the article described above for absorbing and solidifying carbon dioxide in the absorption and solidification of carbon dioxide.

[0028] This invention provides an article for absorbing and solidifying carbon dioxide, which is obtained by casting a slurry; the slurry includes steel slag, activated carbon, cement, quartz sand, water-reducing agent and reinforcing agent; the mass ratio of steel slag, activated carbon, cement and quartz sand is (110-140):(30-50):(15-30):(1-35).

[0029] The beneficial effects of this invention are as follows:

[0030] (1) The mixed dry pellets prepared by this invention use steel slag and activated carbon as raw materials, which can continuously adsorb carbon dioxide and increase the amount of carbon dioxide absorbed. When the product is prepared, the adsorbed carbon dioxide will be slowly released during the curing and later use of the product. It reacts with the steel slag inside, making the carbonization of the product more uniform. The carbon dioxide is converted into calcium carbonate through the reaction and is no longer slowly released into the external environment in the form of gas. At the same time, the dry pellets also act as aggregates, forming a dense network structure and enhancing the mechanical properties of the product.

[0031] (2) The present invention provides a method for preparing a product that absorbs and solidifies carbon dioxide. Quartz sand, as one of the aggregates, can form large pore channels, allowing carbon dioxide molecules to pass into the interior of the product and react with the effective components in the steel slag to generate calcium carbonate, thereby increasing the degree and depth of carbonization and enhancing the mechanical properties of the product.

[0032] (3) The coating of the product reduces the contact between the adsorbent material and the air while ensuring that carbon dioxide does not enter, thereby avoiding the overflow of carbon dioxide and other waste gases during use and causing secondary pollution to the environment.

[0033] (4) The present invention provides a method for preparing a product that absorbs and solidifies carbon dioxide. The entire preparation process is simple to operate, easy to industrialize, and effectively solves the problem of steel slag accumulation, realizes the value-added of solid waste, saves land resources, and is conducive to the advancement of urbanization. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0035] Figure 1 This is a curve showing the change in the weight of the product over time in Example 4 of the present invention. Detailed Implementation

[0036] This invention provides an artificial stone for absorbing carbon dioxide, which is obtained by casting a slurry.

[0037] The grouting material includes steel slag, activated carbon, cement, quartz sand, water-reducing agent, and reinforcing agent;

[0038] The mass ratio of the steel slag, activated carbon, cement and quartz sand is (110-140):(30-50):(15-30):(1-35).

[0039] In this invention, the main components of the steel slag are preferably tricalcium silicate, dicalcium silicate, dicalcium ferrite, RO, and free lime, wherein RO can be one or more of iron, manganese, and magnesium; the activated carbon can be block activated carbon and / or powdered activated carbon, and in terms of usage, it can be one or more of new activated carbon, repeatedly used activated carbon, and activated carbon at the end of its service life. After the activated carbon at the end of its service life completes the CO2 adsorption, it can be solidified inside the artificial stone, and then the activated carbon at the end of its service life is treated.

[0040] In this invention, there are no special restrictions on the selection of cement and quartz sand; any common related materials in the art can be used.

[0041] In this invention, the casting slurry also includes water. In this invention, the water-reducing agent is preferably one or more of naphthalene-based high-efficiency water-reducing agents, aliphatic high-efficiency water-reducing agents, amino high-efficiency water-reducing agents, and polycarboxylate high-performance water-reducing agents; the reinforcing agent is preferably one or more of magnesium sulfate, potassium chloride, and sodium chloride; the mass ratio of the reinforcing agent to water is preferably (1-5):(20-25), more preferably (2-4):(20-25), and most preferably (2-3):(20-25).

[0042] In this invention, the preferred mass ratio of steel slag, activated carbon, cement and quartz sand is (110-140):(30-50):(15-30):(1-35), more preferably (115-135):(35-45):(20-25):(5-30), and most preferably (120-130):(40-45):(20-25):(10-25).

[0043] This invention provides a method for preparing an artificial stone that absorbs carbon dioxide, comprising the following steps:

[0044] A) Mix and ball-mill steel slag (40-65% of the total mass of steel slag) and activated carbon (50-80% of the total mass of activated carbon) to obtain mixed dry ball material;

[0045] The remaining steel slag, remaining activated carbon, cement, and quartz sand are mixed to obtain a mixed dry material;

[0046] B) The mixed dry pellets and mixed dry materials are mixed with the mixed solution to obtain the casting slurry;

[0047] The mixed solution includes a water-reducing agent and a reinforcing agent;

[0048] C) The slurry is poured into a mold to form a rough blank;

[0049] D) The rough blank is coated, dried, and then coated again, wherein the number of layers of multi-layer coating is not less than 3;

[0050] E) The rough blank after patina formation is carbonized and cured to obtain the finished product.

[0051] This application first mixes and ball-mills a portion of steel slag and a portion of activated carbon to prepare a mixed dry ball material.

[0052] In this invention, the mixed dry pellets formed by ball milling have a fixed spherical shape and are spherical materials. On the one hand, they can absorb carbon dioxide; on the other hand, the dry pellets act as aggregates, enhancing the mechanical strength of the product. In this invention, the steel slag used to prepare the mixed dry pellets accounts for 40-65% of the total mass of steel slag, preferably 45-60%, such as 40%, 45%, 50%, 60%, 65%, preferably within the range of any of the above values ​​as the upper or lower limit. The activated carbon used to prepare the mixed dry pellets accounts for 50-80% of the total mass of activated carbon, preferably 55-75%, such as 50%, 55%, 60%, 65%, 70%, 75%, 80%, preferably within the range of any of the above values ​​as the upper or lower limit.

[0053] Then, the remaining steel slag, remaining activated carbon, cement, and quartz sand are mixed to obtain a mixed dry material. In this invention, the types and amounts of steel slag, activated carbon, cement, and quartz sand are the same as those described above, and will not be repeated here.

[0054] After obtaining the mixed dry pellets and mixed dry materials, the present invention mixes the mixed dry pellets and mixed dry materials with a mixed solution containing a water-reducing agent and a reinforcing agent to form a casting slurry.

[0055] In this invention, the types and amounts of water in the water-reducing agent, reinforcing agent, and mixed solution are the same as those in the water-reducing agent, reinforcing agent, and mixed solution described above, and will not be repeated here.

[0056] After obtaining the casting slurry, the present invention pours the casting slurry into a mold, seals and cures it to form a shape, demolds it, and obtains a rough blank.

[0057] In this invention, the temperature for sealing and curing is preferably 60-100℃, more preferably 70-90℃, such as 60℃, 65℃, 70℃, 75℃, 80℃, 85℃, 90℃, 95℃, 100℃, preferably a range of values ​​with any of the above values ​​as the upper or lower limit; the time for sealing and curing is preferably 12-24 hours.

[0058] After obtaining the rough blank, the present invention applies a coating, dries the rough blank, and applies another coating, wherein the number of multiple coating layers is not less than 3.

[0059] In this invention, the coating reduces the contact between the adsorbent material and the air, thereby avoiding the leakage of carbon dioxide and other waste gases during use, which could cause secondary pollution to the environment. Preferably, this invention uses a finely ground mixture of steel slag, cement, and quartz sand for coating, wherein the preferred mass ratio of steel slag, cement, and quartz sand is (20–50):(1–10):(1–5), and more preferably (30–40):(3–8):(2–4).

[0060] The drying temperature is preferably 80-100℃, more preferably 85-95℃, and the drying time is preferably 12-24 hours, more preferably 18-20 hours.

[0061] After the patina is applied, the rough blank is carbonized and cured to obtain a product that has absorbed and solidified carbon dioxide.

[0062] The carbonization conditions are as follows: carbon dioxide concentration of 10-100%, preferably 20-80%, such as 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, preferably within the range of any of the above values ​​as the upper or lower limit; and time of 6-48 hours, preferably 10-36 hours.

[0063] The present invention also provides an application of the article for absorbing and consolidating carbon dioxide as described above in the absorption and consolidation of carbon dioxide. The article of the present invention can absorb and consolidate carbon dioxide, and at the same time improve the strength of the substrate.

[0064] This invention provides an article for absorbing and solidifying carbon dioxide, which is obtained by casting a slurry; the slurry includes steel slag, activated carbon, cement, quartz sand, water-reducing agent and reinforcing agent; the mass ratio of steel slag, activated carbon, cement and quartz sand is (110-140):(30-50):(15-30):(1-35).

[0065] The beneficial effects of this invention are as follows:

[0066] (1) The mixed dry pellets prepared by this invention use steel slag and activated carbon as raw materials, which can continuously adsorb carbon dioxide and increase the amount of carbon dioxide absorbed. When the product is prepared, the adsorbed carbon dioxide will be slowly released during the curing and later use of the product. It reacts with the steel slag inside, making the carbonization of the product more uniform. The carbon dioxide is converted into calcium carbonate through the reaction and is no longer slowly released into the external environment in the form of gas. At the same time, the dry pellets also act as aggregates, forming a dense network structure and enhancing the mechanical properties of the product.

[0067] (2) The present invention provides a method for preparing a product that absorbs and solidifies carbon dioxide. Quartz sand, as one of the aggregates, can form large pore channels, allowing carbon dioxide molecules to pass into the interior of the product and react with the effective components in the steel slag to generate calcium carbonate, thereby increasing the degree and depth of carbonization and enhancing the mechanical properties of the product.

[0068] (3) The coating of the product reduces the contact between the adsorbent material and the air, thereby avoiding the leakage of carbon dioxide and other waste gases during use, which would cause secondary pollution to the environment.

[0069] (4) The present invention provides a method for preparing a product that absorbs and solidifies carbon dioxide. The entire preparation process is simple to operate, easy to industrialize, and effectively solves the problem of steel slag accumulation, realizes the value-added of solid waste, saves land resources, and is conducive to the advancement of urbanization.

[0070] To further illustrate the present invention, the following detailed description, in conjunction with embodiments, describes an article for absorbing and solidifying carbon dioxide, its preparation method, and its application, but this should not be construed as limiting the scope of protection of the present invention.

[0071] Example 1

[0072] Mix 200g of steel slag and 120g of activated carbon evenly and then ball mill them to make mixed dry pellets.

[0073] Mix 1000g of steel slag, 200g of cement, and 600g of quartz sand evenly. Add 5% of the mass of the new activated carbon to the total mass of the mixed dry pellets and the mixed dry material (excluding activated carbon) to obtain the mixed dry material.

[0074] Dissolve 10g KCl in 200g water and stir to obtain an aqueous solution of the reinforcing agent;

[0075] Dissolve 50g of polycarboxylate superplasticizer in 300g of reinforcing agent aqueous solution to obtain a mixture;

[0076] Mix the mixed dry pellets, mixed dry materials, and mixed solution evenly to form a casting slurry;

[0077] Pour the grout into a 10cm*10cm*1cm plastic mold, cure it under sealed conditions for 12 hours, then demold it. Next, apply a coating, dry it at 80℃ for 24 hours, and repeat the coating process three times.

[0078] The rough blank after patina was cured in 20% carbon dioxide for 36 hours to obtain a product that absorbs and solidifies carbon dioxide.

[0079] Example 2

[0080] Mix 200g of steel slag and 120g of activated carbon evenly and then ball mill them to make mixed dry pellets.

[0081] Mix 1000g of steel slag, 200g of cement, and 600g of quartz sand evenly. Add 10% of the mass of the new activated carbon to the total mass of the mixed dry pellets and the mixed dry material (excluding activated carbon) to obtain the mixed dry material.

[0082] Dissolve 10g KCl in 200g water and stir to obtain an aqueous solution of the reinforcing agent;

[0083] Dissolve 50g of polycarboxylate superplasticizer in 300g of reinforcing agent aqueous solution to obtain a mixture;

[0084] Mix the mixed dry pellets, mixed dry materials, and mixed solution evenly to form a casting slurry;

[0085] Pour the grout into a 10cm*10cm*1cm plastic mold, cure it under sealed conditions for 12 hours, then demold it. Next, apply a coating, dry it at 80℃ for 24 hours, and repeat the coating process three times.

[0086] The rough blank after patina was cured in 20% carbon dioxide for 36 hours to obtain a product that absorbs and solidifies carbon dioxide.

[0087] Example 3

[0088] Mix 200g of steel slag and 120g of activated carbon evenly and then ball mill them to make mixed dry pellets.

[0089] Mix 1000g of steel slag, 200g of cement, and 600g of quartz sand evenly. Add 15% of the mass of the mixed dry pellets and the total mass of the mixed dry materials (excluding activated carbon) to obtain the mixed dry materials.

[0090] Dissolve 10g KCl in 200g water and stir to obtain an aqueous solution of the reinforcing agent;

[0091] Dissolve 50g of polycarboxylate superplasticizer in 300g of reinforcing agent aqueous solution to obtain a mixture;

[0092] Mix the mixed dry pellets, mixed dry materials, and mixed solution evenly to form a casting slurry;

[0093] Pour the grout into a 10cm*10cm*1cm plastic mold, cure it under sealed conditions for 12 hours, then demold it. Next, apply a coating, dry it at 80℃ for 24 hours, and repeat the coating process three times.

[0094] The rough blank after patina was cured in 20% carbon dioxide for 36 hours to obtain a product that absorbs and solidifies carbon dioxide.

[0095] Example 4

[0096] Mix 200g of steel slag and 120g of activated carbon evenly and then ball mill them to make mixed dry pellets.

[0097] Mix 1000g of steel slag, 200g of cement, and 600g of quartz sand evenly. Add 20% of the mass of the new activated carbon to the total mass of the mixed dry pellets and the mixed dry material (excluding activated carbon) to obtain the mixed dry material.

[0098] Dissolve 10g KCl in 200g water and stir to obtain an aqueous solution of the reinforcing agent;

[0099] Dissolve 50g of polycarboxylate superplasticizer in 300g of reinforcing agent aqueous solution to obtain a mixture;

[0100] Mix the mixed dry pellets, mixed dry materials, and mixed solution evenly to form a casting slurry;

[0101] Pour the grout into a 10cm*10cm*1cm plastic mold, cure it under sealed conditions for 12 hours, then demold it. Next, apply a coating, dry it at 80℃ for 24 hours, and repeat the coating process three times.

[0102] The rough blank after patina was cured in 20% carbon dioxide for 36 hours to obtain a product that absorbs and solidifies carbon dioxide.

[0103] Example 5

[0104] Mix 200g of steel slag and 120g of activated carbon evenly and then ball mill them to make mixed dry pellets.

[0105] Mix 1000g of steel slag, 200g of cement, and 600g of quartz sand evenly. Add new activated carbon at a mass of 30% of the total mass of the mixed dry pellets and the mixed dry material (excluding activated carbon) to obtain the mixed dry material.

[0106] Dissolve 10g KCl in 200g water and stir to obtain an aqueous solution of the reinforcing agent;

[0107] Dissolve 50g of polycarboxylate superplasticizer in 300g of reinforcing agent aqueous solution to obtain a mixture;

[0108] Mix the mixed dry pellets, mixed dry materials, and mixed solution evenly to form a casting slurry;

[0109] Pour the grout into a 10cm*10cm*1cm plastic mold, cure it under sealed conditions for 12 hours, then demold it. Next, apply a coating, dry it at 80℃ for 24 hours, and repeat the coating process three times.

[0110] The rough blank after patina was cured in 20% carbon dioxide for 36 hours to obtain a product that absorbs and solidifies carbon dioxide.

[0111] Example 6

[0112] Mix 200g of steel slag and 120g of activated carbon evenly and then ball mill them to make mixed dry pellets.

[0113] Mix 1000g of steel slag, 200g of cement, and 600g of quartz sand evenly. Add new activated carbon at a mass of 30% of the total mass of the mixed dry pellets and the mixed dry material (excluding activated carbon) to obtain the mixed dry material.

[0114] Dissolve 10g KCl in 200g water and stir to obtain an aqueous solution of the reinforcing agent;

[0115] Dissolve 50g of polycarboxylate superplasticizer in 300g of reinforcing agent aqueous solution to obtain a mixture;

[0116] Mix the mixed dry pellets, mixed dry materials, and mixed solution evenly to form a casting slurry;

[0117] Pour the grout into a 10cm*10cm*1cm plastic mold, cure it under sealed conditions for 12 hours, then demold it. Next, apply a coating, dry it at 80℃ for 24 hours, and repeat the coating process three times.

[0118] The rough blank after patina was cured in 20% carbon dioxide for 36 hours to obtain a product that absorbs and solidifies carbon dioxide.

[0119] Comparative Examples 1-6

[0120] The only difference between Comparative Examples 1-6 and Examples 1-6 is that the activated carbon used in Examples 1-6 was replaced with reusable activated carbon.

[0121] Comparative Example 7

[0122] Mix 200g of steel slag and 120g of activated carbon evenly and then ball mill them to make mixed dry pellets.

[0123] Mix 1000g of steel slag and 200g of cement evenly. Add 30% of the mass of the new activated carbon to the total mass of the mixed dry pellets and the mixed dry material (excluding activated carbon) to obtain the mixed dry material.

[0124] Dissolve 10g KCl in 200g water and stir to obtain an aqueous solution of the reinforcing agent;

[0125] Dissolve 50g of polycarboxylate superplasticizer in 300g of reinforcing agent aqueous solution to obtain a mixture;

[0126] Mix the mixed dry pellets, mixed dry materials, and mixed solution evenly to form a casting slurry;

[0127] Pour the grout into a 10cm*10cm*1cm plastic mold, cure it under sealed conditions for 12 hours, then demold it. Next, apply a coating, dry it at 80℃ for 24 hours, and repeat the coating process three times.

[0128] The rough blank after patina was cured in 20% carbon dioxide for 36 hours to obtain a product that absorbs and solidifies carbon dioxide.

[0129] Comparative Example 8

[0130] 200g of steel slag was ball-milled into a mixed dry ball material;

[0131] Mix 1000g of steel slag, 200g of cement, and 600g of quartz sand evenly to obtain a dry mixture.

[0132] Dissolve 10g KCl in 200g water and stir to obtain an aqueous solution of the reinforcing agent;

[0133] Dissolve 50g of polycarboxylate superplasticizer in 300g of reinforcing agent aqueous solution to obtain a mixture;

[0134] Mix the mixed dry pellets, mixed dry materials, and mixed solution evenly to form a casting slurry;

[0135] Pour the grout into a 10cm*10cm*1cm plastic mold, cure it under sealed conditions for 12 hours, then demold it. Next, apply a coating, dry it at 80℃ for 24 hours, and repeat the coating process three times.

[0136] The rough blank after patina was cured in 20% carbon dioxide for 36 hours to obtain a product that absorbs and solidifies carbon dioxide.

[0137] Comparative Example 9

[0138] Mix 200g of steel slag and 120g of activated carbon evenly and then ball mill them to make mixed dry pellets.

[0139] Mix 1000g of steel slag, 200g of cement, and 600g of quartz sand evenly to obtain a dry mixture.

[0140] Dissolve 10g KCl in 200g water and stir to obtain an aqueous solution of the reinforcing agent;

[0141] Dissolve 50g of polycarboxylate superplasticizer in 300g of reinforcing agent aqueous solution to obtain a mixture;

[0142] Mix the mixed dry pellets, mixed dry materials, and mixed solution evenly to form a casting slurry;

[0143] Pour the grout into a 10cm*10cm*1cm plastic mold, cure it under sealed conditions for 12 hours, then demold it. Next, apply a coating, dry it at 80℃ for 24 hours, and repeat the coating process three times.

[0144] The rough blank after patina was cured in 20% carbon dioxide for 36 hours to obtain an artificial stone product that absorbs and solidifies carbon dioxide.

[0145] Testing and Analysis:

[0146] The results of CO2 carbon sequestration, carbonization depth and compressive strength tests on the artificial stones for absorbing carbon dioxide prepared in Examples 1-6 and Comparative Examples 1-9 are shown in Table 1.

[0147] Carbon sequestration test:

[0148] Calculation of specific gravity before and after carbonization

[0149] Carbonization depth test:

[0150] Cut a 10mm radius cylindrical sample in half lengthwise, and add 10 drops of a concentration of [missing information - likely a specific concentration] to each sample.

[0151] The carbonization depth of a 2 wt% phenolphthalein solution was determined by measuring the color change of the sample using vernier calipers.

[0152] Compressive strength test:

[0153] The compressive strength of the sample was tested using a SANS universal testing machine at a descent speed of 0.5 mm / s.

[0154] Table 1

[0155]

[0156]

[0157] Examples 1-6 show that, compared to the control (Comparative Example 9) without activated carbon, the CO2 absorption efficiency significantly improved with increasing amounts of new activated carbon in the mixed dry materials, reaching a maximum of 28% when the amount of new activated carbon was 30%. The compressive strength of the product initially increased and then decreased with increasing amounts of new activated carbon, reaching a maximum of 60 MPa when the amount of new activated carbon was 20%. When the amount of new activated carbon reached 30%, the compressive strength of the product was low, only 33 MPa. When the amount of new activated carbon exceeded 30%, it affected the bonding of the cementitious material, resulting in the inability to form the product. In summary, the addition of new activated carbon can improve CO2 absorption efficiency, but the amount added should be controlled within a reasonable range. Too little is detrimental to CO2 absorption, while too much will prevent the product from forming.

[0158] Compared with the artificial carbon dioxide absorption stone prepared without activated carbon (Comparative Example 9) in Comparative Examples 1-6, as the amount of activated carbon added after repeated use increased, within the range of 1-30%, the CO2 absorption efficiency and compressive strength showed a trend of first increasing and then decreasing. The CO2 absorption efficiency reached its highest point of 25% when the amount of activated carbon added after repeated use was 30%, and the compressive strength reached its highest point of 52 MPa when the amount of activated carbon added after repeated use was 20%. When the amount of activated carbon added after repeated use exceeded 30%, the product failed to form.

[0159] Compared with Examples 1-6, the CO2 absorption rate of activated carbon after repeated use or at the end of its service life will decrease. However, the addition of activated carbon after repeated use will also play a certain role.

[0160] Compared with Example 5 and Comparative Example 7, quartz sand as aggregate can effectively improve the mechanical strength of the product. At the same time, quartz sand can provide large pores, allowing carbon dioxide to enter the interior of the product and react with steel slag to generate calcite, thereby increasing its carbonization depth and compressive strength.

[0161] The product is tested in an outdoor environment, such as... Figure 1 As shown, the weight of the product did not decrease significantly within 0 to 12 months, indicating that no gases or other substances were released during use.

[0162] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An article for absorbing and solidifying carbon dioxide, obtained by casting a slurry; The grouting material includes steel slag, activated carbon, cement, quartz sand, water-reducing agent, and reinforcing agent; The mass ratio of steel slag, activated carbon, cement, and quartz sand is (110~140):(30~50):(15~30):(1~35); The product for absorbing and solidifying carbon dioxide is prepared according to the following steps: A) Mix and ball-mill 40-65% of the total mass of steel slag and 50-80% of the total mass of activated carbon to obtain mixed dry ball material; the mass ratio of steel slag to activated carbon in the preparation of mixed dry ball material in step A) is (60-70):(25-40). The remaining steel slag, remaining activated carbon, cement, and quartz sand are mixed to obtain a mixed dry material; the mass ratio of the remaining steel slag, remaining activated carbon, cement, and quartz sand in step A) is (50~70):(5~10):(15~30):(1~35). B) The mixed dry pellets and mixed dry materials are mixed with the mixed solution to obtain the casting slurry; The mixed solution includes a water-reducing agent and a reinforcing agent; C) The slurry is poured into a mold to form a rough blank; D) The rough blank is coated, dried, and then coated again, wherein the number of layers of multi-layer coating is not less than 3; the coating material is a mixture of steel slag, cement and quartz sand, and the mass ratio of steel slag, cement and quartz sand is (20~50):(1~10):(1~5). E) Carbonize and cure the rough blank after patina formation to obtain the finished product.

2. The product for absorbing and solidifying carbon dioxide according to claim 1, characterized in that, The steel slag comprises tricalcium silicate, dicalcium silicate, dicalcium ferrite, RO and free lime; R is one or more of iron, manganese and magnesium.

3. The product for absorbing and solidifying carbon dioxide according to claim 1, characterized in that, The water-reducing agent is one or more of the following: naphthalene-based high-efficiency water-reducing agent, aliphatic high-efficiency water-reducing agent, amino high-efficiency water-reducing agent, polycarboxylate high-performance water-reducing agent; the reinforcing agent is one or more of the following: magnesium sulfate, potassium chloride, sodium chloride.

4. The method for preparing the product for absorbing and solidifying carbon dioxide as described in claim 1, comprising the following steps: A) Mix and ball-mill 40-65% of the total mass of steel slag and 50-80% of the total mass of activated carbon to obtain mixed dry ball material; the mass ratio of steel slag to activated carbon in the preparation of mixed dry ball material in step A) is (60-70):(25-40). The remaining steel slag, remaining activated carbon, cement, and quartz sand are mixed to obtain a mixed dry material; the mass ratio of the remaining steel slag, remaining activated carbon, cement, and quartz sand in step A) is (50~70):(5~10):(15~30):(1~35). B) The mixed dry pellets and mixed dry materials are mixed with the mixed solution to obtain the casting slurry; The mixed solution includes a water-reducing agent and a reinforcing agent; C) The slurry is poured into a mold to form a rough blank; D) The rough blank is coated, dried, and then coated again, wherein the number of layers of multi-layer coating is not less than 3; the coating material is a mixture of steel slag, cement and quartz sand, and the mass ratio of steel slag, cement and quartz sand is (20~50):(1~10):(1~5). E) Carbonize and cure the rough blank after patina formation to obtain the finished product.

5. The preparation method according to claim 4, characterized in that, Step C) is as follows: The slurry is poured into a mold and sealed for curing for 12-24 hours to obtain a rough blank.

6. The preparation method according to claim 4, characterized in that, The drying time in step D) is 12-24 hours, and the drying temperature is 80-100℃.

7. The preparation method according to claim 4, characterized in that, The carbonization conditions are a carbon dioxide concentration of 10-100% and a time of 6-48 hours.

8. The application of the product for absorbing and solidifying carbon dioxide as described in claim 1 in the absorption and solidification of carbon dioxide.

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