An additive for improving carbon fixation and activity of steel slag-based carbonized cementitious material and a method of using the additive

Abstract

The technical field of building materials of the present invention discloses an admixture for improving the carbon fixation and activity of steel slag-based carbonized cementitious materials and a method for using the admixture. The admixture of the present invention is prepared from raw materials including, by weight, 1 to 5 parts of disodium ethylenediaminetetraacetate, 1 to 10 parts of potassium carbonate, 1 to 5 parts of polycarboxylic acid, and 80 to 98 parts of solvent. The admixture obtained by using the raw materials only needs to be added in a small amount to effectively improve the carbon fixation, activity index, and stability of steel slag, and can be widely used for carbon dioxide sequestration and steel slag resource utilization. In addition, the preparation method of the admixture of the present invention is simple, does not require complicated and cumbersome operations, has low raw material costs, high safety, and is suitable for industrial production.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, in particular to an additive for improving the carbon fixation amount and activity of steel slag-based carbonized cementitious materials and a use method thereof. Background Art

[0002] Related research shows that by accelerating the carbonation of alkaline industrial solid wastes such as steel slag containing free calcium oxide and free magnesium oxide, CO2 can be directly and permanently stored in the form of carbonates. At the same time, carbonization is conducive to improving the volume stability of steel slag, promoting a significant increase in the resource utilization rate of steel slag, and achieving the dual goals of carbon dioxide storage and steel slag resource utilization. However, at present, the steel slag of most domestic steel companies is difficult to effectively capture carbon dioxide, and there is a problem of low carbon dioxide capture efficiency.

[0003] Based on this, how to improve the carbon dioxide capture rate and increase the carbon fixation capacity of steel slag has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an additive for improving the carbon fixation and activity of steel slag-based carbonized cementitious materials, which can effectively improve the carbon fixation, activity index and stability of steel slag.

[0005] The invention also provides a method for preparing the admixture.

[0006] The invention also provides a steel slag carbon fixation method.

[0007] The invention also provides a steel slag carbonization gelling material.

[0008] The invention also proposes the use of an admixture in preparing carbon-fixing gelling materials or fixing carbon dioxide.

[0009] The first aspect of the present invention provides an admixture, wherein the raw materials for preparing the admixture include, by weight:

[0010]

[0011]

[0012] The admixture according to the embodiment of the present invention has at least the following beneficial effects:

[0013] (1) The additive provided by the present invention is composed of disodium ethylenediaminetetraacetate, potassium carbonate, polycarboxylic acid and solvent, which can improve Ca through the complexation of polar groups such as hydroxyl and carboxyl groups. 2+ dissolution, thereby accelerating the carbonization rate of slag.

[0014] (2) Disodium ethylenediaminetetraacetate added to the admixture of the present invention can be directly dissolved in water to form a coordination system, and synergistically promote the complex reaction between the metal ions in the steel slag and the polycarboxylic acid, thereby improving the stability and carbon fixation performance of the steel slag. In addition, the combination of polycarboxylic acid and disodium ethylenediaminetetraacetate also helps to improve the viscosity and fluidity of the steel slag, making it easier to encapsulate and fix carbon elements, which is beneficial to increase the carbon fixation amount.

[0015] (3) The complexing components provided by the present invention (such as disodium ethylenediaminetetraacetic acid, potassium carbonate, and polycarboxylic acid) only need to be added in a small amount (about 0.5% to 1.5% of the weight of the steel slag), and the carbon fixation amount and activity index can be significantly improved. For example, the carbon fixation amount is increased by 20% to 40% compared with the undoped state, the 3d activity index of the steel slag can be increased by 5% to 17%, and the 28d activity index can be increased by 5% to 10%, while ensuring that the stability of the steel slag is qualified.

[0016] In some embodiments of the present invention, the polycarboxylic acid is selected from at least one or two of acetic acid, 2-hydroxysuccinic acid, and polyacrylic acid.

[0017] In some embodiments of the present invention, the raw materials for preparation include, by weight:

[0018]

[0019] In some embodiments of the invention, the solvent comprises water.

[0020] In some embodiments of the present invention, the raw materials for preparation include, by weight:

[0021]

[0022] 2-Hydroxybutanediol, as an organic acid containing hydroxyl and carboxyl groups, has better complexing properties than polyacrylic acid. It can form stable complexes with metal ions, thereby reducing the activity of metal ions and helping to improve the stability and carbon fixation performance of steel slag. Polyacrylic acid is a polymer compound with strong adsorption capacity and adhesion. In the carbon fixation process, it mainly improves the fluidity and viscosity of steel slag, which is conducive to improving the capture of CO2 and thus improving the carbon fixation effect.

[0023] In some embodiments of the present invention, the admixture is used for CO2 capture and storage.

[0024] The second aspect of the present invention provides a method for preparing the admixture as described in the first aspect, which is obtained by mixing the raw materials for preparing the admixture.

[0025] The preparation method according to the embodiment of the present invention has at least the following beneficial effects: the preparation process of the admixture of the present invention is simple, does not require complicated and tedious operations, and has low cost and high safety.

[0026] The third aspect of the present invention provides a method for carbonizing steel slag, comprising contacting the additive described in any one of the first aspects with steel slag and subjecting the mixture to carbonization treatment.

[0027] In some embodiments of the present invention, the mass ratio of the admixture to the steel slag is 1:3-8; preferably, the mass ratio of the admixture to the steel slag is 1:3-6.

[0028] In some embodiments of the present invention, the steel slag comprises 35% to 42% CaO, 25% to 30% Fe2O3, 10% to 15% SiO2, 5% to 8% MgO, 3% to 6% Al2O3, 3% to 4% MnO and 1% to 2% P2O5.

[0029] In some embodiments of the present invention, the steel slag comprises 38% to 40% CaO, 27% to 30% Fe2O3, 12% to 15% SiO2, 5% to 8% MgO, 3% to 5% Al2O3, 3% to 4% MnO and 1 to 2% P2O5.

[0030] In some embodiments of the present invention, the specific surface area of ​​the steel slag is 300 to 400 m 2 / kg.

[0031] In some embodiments of the present invention, the temperature of the carbonization treatment is 30-70°C.

[0032] Within this carbonization temperature range, carbon atoms and metal atoms are effectively combined, which increases the amount of carbon fixation. However, above this temperature, the amount of carbon fixation will decrease. This is because at high temperatures, although the carbonization reaction rate is faster, it may lead to excessive carbonization or the formation of isolated carbides, which in turn affects the carbon fixation effect.

[0033] In some embodiments of the present invention, the carbonization treatment time is 0.5 to 2 hours. Preferably, the carbonization treatment time is 0.5 to 1 hour.

[0034] In some embodiments of the present invention, the pressure of the carbonization treatment is 0.02-0.04 MPa.

[0035] Within this carbonization pressure range, carbon atoms can more easily penetrate into the surface and interior of the slag to form a uniform carbonization layer, which helps to increase the amount of carbon fixation. When the pressure is lower than this range, the diffusion capacity of gas molecules is significantly weakened, and carbon atoms are often difficult to effectively penetrate the surface or interior of the material; when the pressure is higher than this range, it is easy to cause excessive aggregation of carbon atoms, forming large particles of carbide, which in turn affects the carbon fixation effect.

[0036] In some embodiments of the present invention, the CO2 concentration in the carbonization treatment is 90% to 100%.

[0037] When the CO2 concentration is lower than this range, the insufficient supply of carbon atoms can easily cause the carbonization reaction to be slow, thereby forming an uneven carbonization layer, which is not conducive to increasing the amount of carbon fixation.

[0038] A fourth aspect of the present invention provides a steel slag carbonized cementitious material, the raw materials for preparing the steel slag carbonized cementitious material include the additive described in any one of the first aspects and steel slag.

[0039] The fifth aspect of the present invention provides use of the admixture as described in any one of the first aspects in preparing carbon-fixing cementitious materials or fixing carbon dioxide.

[0040] In some embodiments of the present invention, the carbon-fixing cementitious material includes steel slag carbonized cementitious material.

[0041] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the embodiments to clearly and completely describe the concept of the present invention and the technical effects produced, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0043] When a numerical range is disclosed herein, the above range is considered to be continuous and includes the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0044] In a specific embodiment of the present invention, the steel slag is derived from a steel slag having a main component of about 39.20% CaO, 28.33% Fe2O3, 13.45% SiO2, 6.13% MgO, 4.59% Al2O3, 3.885% MnO and 1.86% P2O5; the specific surface area of ​​the steel slag is 300-400m 2 / kg.

[0045] Unless otherwise specified, "about" in the present invention means that the allowable error is within ±2%.

[0046] Unless otherwise specified, "room temperature" in the present invention means 25°C±5°C.

[0047] If the specific conditions are not specified in the examples, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. If the manufacturers of the reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0048] Example 1

[0049] This embodiment provides an additive for improving the carbon fixation and activity of steel slag-based carbonized cementitious materials and a method for using the additive. The additive comprises the following raw materials as shown in Table 1 in parts by weight:

[0050] Table 1: Example 1 admixture components

[0051]

[0052]

[0053] The method for using the above-mentioned admixture comprises the following steps:

[0054] Step S1, at room temperature, according to the above weight parts, disodium ethylenediaminetetraacetate, potassium carbonate, acetic acid and water are fully mixed to obtain an additive solution.

[0055] Step S2, adding steel slag in a ratio of 1:5 of the mass of the additive solution to the mass of the steel slag, stirring evenly, and then placing it in a carbonization kettle for carbonization, the carbonization conditions are: carbonization temperature 30-70°C, carbonization pressure 0.02-0.04MPa, carbonization time 0.5-1.0h, CO2 concentration 90%-100%, and obtaining finished product A after carbonization is completed.

[0056] Example 2

[0057] This embodiment provides an additive for improving the carbon fixation and activity of steel slag-based carbonized cementitious materials and a method for using the additive. The additive comprises the following raw materials as shown in Table 2 in terms of weight:

[0058] Table 2: Example 2 admixture components

[0059]

[0060] The method for using the above-mentioned admixture comprises the following steps:

[0061] Step S1, at room temperature, according to the above weight parts, disodium ethylenediaminetetraacetate, potassium carbonate, acetic acid, 2-hydroxysuccinic acid and water are fully mixed to obtain an additive solution.

[0062] Step S2, adding steel slag in a ratio of 1:5 of the mass of the additive solution to the mass of the steel slag, stirring evenly, and then placing it in a carbonization kettle for carbonization, the carbonization conditions are: carbonization temperature 30-70°C, carbonization pressure 0.02-0.04MPa, carbonization time 0.5-1.0h, CO2 concentration 90%-100%, and obtaining the finished product B after the carbonization is completed.

[0063] Example 3

[0064] This embodiment provides an additive for improving the carbon fixation and activity of steel slag-based carbonized cementitious materials and a method for using the additive. The additive comprises the following raw materials as shown in Table 3 in parts by weight:

[0065] Table 3: Example 3 admixture components

[0066]

[0067]

[0068] The method for using the above-mentioned admixture comprises the following steps:

[0069] Step S1, at room temperature, according to the above weight parts, disodium ethylenediaminetetraacetate, potassium carbonate, acetic acid, 2-hydroxysuccinic acid and water are fully mixed to obtain an additive solution.

[0070] Step S2, adding steel slag in a ratio of 1:5 of the mass of the additive solution to the mass of the steel slag, stirring evenly, and then placing it in a carbonization kettle for carbonization, the carbonization conditions are: carbonization temperature 30-70°C, carbonization pressure 0.02-0.04MPa, carbonization time 0.5-1.0h, CO2 concentration 90%-100%, and obtaining the finished product C after carbonization is completed.

[0071] Example 4

[0072] This embodiment provides an additive for improving the carbon fixation and activity of steel slag-based carbonized cementitious materials and a method for using the additive. The additive comprises the following raw materials as shown in Table 4 in terms of weight:

[0073] Table 4: Example 4 admixture components

[0074]

[0075] The method for using the above-mentioned admixture comprises the following steps:

[0076] Step S1, at room temperature, according to the above weight parts, disodium ethylenediaminetetraacetate, potassium carbonate, acetic acid, polyacrylic acid and water are fully mixed to obtain an additive solution.

[0077] Step S2, adding steel slag in a ratio of 1:5 of the mass of the additive solution to the mass of the steel slag, stirring evenly, and then placing it in a carbonization kettle for carbonization, the carbonization conditions are: carbonization temperature 30-70°C, carbonization pressure 0.02-0.04MPa, carbonization time 0.5-1.0h, CO2 concentration 90%-100%, and the finished product D is obtained after the carbonization is completed.

[0078] Example 5

[0079] This embodiment provides an additive for improving the carbon fixation and activity of steel slag-based carbonized cementitious materials and a method for using the additive. The additive comprises the following raw materials as shown in Table 5 in parts by weight:

[0080] Table 5: Example 5 admixture components

[0081]

[0082] The method for using the above-mentioned admixture comprises the following steps:

[0083] Step S1, at room temperature, according to the above weight parts, disodium ethylenediaminetetraacetate, potassium carbonate, acetic acid, 2-hydroxysuccinic acid and water are fully mixed to obtain an additive solution.

[0084] Step S2, adding steel slag in a ratio of 1:5 between the mass of the additive solution and the mass of the steel slag, stirring evenly, and then placing it in a carbonization kettle for carbonization, the carbonization conditions are: carbonization temperature 30-70°C, carbonization pressure 0.02-0.04MPa, carbonization time 0.5-1.0h, CO2 concentration 90%-100%, and the finished product E is obtained after the carbonization is completed.

[0085] Example 6

[0086] This embodiment provides an additive and a method for using the additive to improve the carbon fixation and activity of steel slag-based carbonized cementitious materials. The additive comprises the following raw materials as shown in Table 6 in terms of weight:

[0087] Table 6: Example 6 admixture components

[0088]

[0089] The method for using the above-mentioned admixture comprises the following steps:

[0090] Step S1, at room temperature, according to the above weight parts, disodium ethylenediaminetetraacetate, potassium carbonate, acetic acid, polyacrylic acid and water are fully mixed to obtain an additive solution.

[0091] Step S2, adding steel slag in a ratio of 1:5 of the mass of the additive solution to the mass of the steel slag, stirring evenly, and then placing it in a carbonization kettle for carbonization, the carbonization conditions are: carbonization temperature 30-70°C, carbonization pressure 0.02-0.04MPa, carbonization time 0.5-1.0h, CO2 concentration 90%-100%, and the finished product F is obtained after the carbonization is completed.

[0092] Comparative Example 1

[0093] This comparative example provides a method for storing carbon dioxide using steel slag, which differs from Example 1 in that the additive solution is replaced with an equal volume of water, and the rest remains unchanged, and specifically comprises the following steps:

[0094] Add steel slag to 100 parts of water and stir evenly, then place it in a carbonization kettle for carbonization. The carbonization conditions are: carbonization temperature 30-70°C, carbonization pressure 0.02-0.04MPa, carbonization time 0.5-1.0h, CO2 concentration 90%-100%. After carbonization, the finished product G is obtained.

[0095] Comparative Example 2

[0096] This comparative example provides an admixture for steel slag-based carbonization and a method for using the admixture. The admixture comprises the following raw materials as shown in Table 7, in parts by weight:

[0097] Table 7: Comparative Example 2 Admixture Components

[0098]

[0099] The method for using the above-mentioned admixture comprises the following steps:

[0100] Step S1, at room temperature, according to the above weight parts, potassium carbonate, acetic acid, 2-hydroxysuccinic acid and water are fully mixed to obtain an additive solution.

[0101] Step S2, adding steel slag in a ratio of 1:5 of the mass of the additive solution to the mass of the steel slag, stirring evenly, and then placing it in a carbonization kettle for carbonization, and the carbonization conditions are: carbonization temperature 30-70° C., carbonization pressure 0.02-0.04 MPa, carbonization time 0.5-1.0 h, CO2 concentration 90%-100%, and obtaining the finished product H after carbonization.

[0102] Comparative Example 3

[0103] This comparative example provides an admixture for steel slag-based carbonization and a method for using the admixture. The admixture comprises the following raw materials as shown in Table 8, in parts by weight:

[0104] Table 8: Comparative Example 3 Admixture Components

[0105]

[0106] The method for using the above-mentioned admixture comprises the following steps:

[0107] Step S1, at room temperature, according to the above weight parts, disodium ethylenediaminetetraacetate, acetic acid, 2-hydroxysuccinic acid and water are fully mixed to obtain an additive solution.

[0108] Step S2, adding steel slag in a ratio of 1:5 of the mass of the additive solution to the mass of the steel slag, stirring evenly, and then placing it in a carbonization kettle for carbonization, the carbonization conditions are: carbonization temperature 30-70°C, carbonization pressure 0.02-0.04MPa, carbonization time 0.5-1.0h, CO2 concentration 90%-100%, and obtaining the finished product I after the carbonization is completed.

[0109] Comparative Example 4

[0110] This comparative example provides an admixture for steel slag-based carbonization and a method for using the admixture. The admixture comprises the following raw materials as shown in Table 9, in parts by weight:

[0111] Table 9: Comparative Example 4 Admixture Components

[0112]

[0113] The method for using the above-mentioned admixture comprises the following steps:

[0114] Step S1, at room temperature, according to the above weight parts, acetic acid, 2-hydroxysuccinic acid and water are fully mixed to obtain an additive solution.

[0115] Step S2, adding steel slag in a ratio of 1:5 of the mass of the additive solution to the mass of the steel slag, stirring evenly, and then placing it in a carbonization kettle for carbonization, the carbonization conditions are: carbonization temperature 30-70°C, carbonization pressure 0.02-0.04MPa, carbonization time 0.5-1.0h, CO2 concentration 90%-100%, and obtaining the finished product J after the carbonization is completed.

[0116] Comparative Example 5

[0117] This comparative example provides an admixture for steel slag-based carbonization and a method for using the admixture. The admixture comprises the following raw materials as shown in Table 10, in parts by weight:

[0118] Table 10: Comparative Example 5 Admixture Components

[0119]

[0120] The method for using the above-mentioned admixture comprises the following steps:

[0121] Step S1, at room temperature, according to the above weight parts, disodium ethylenediaminetetraacetate, potassium carbonate and water are fully mixed to obtain an additive solution.

[0122] Step S2, adding steel slag in a ratio of 1:5 of the mass of the additive solution to the mass of the steel slag, stirring evenly, and then placing it in a carbonization kettle for carbonization, the carbonization conditions are: carbonization temperature 30-70°C, carbonization pressure 0.02-0.04MPa, carbonization time 0.5-1.0h, CO2 concentration 90%-100%, and the finished product K is obtained after the carbonization is completed.

[0123] Comparative Example 6

[0124] This comparative example provides an admixture for steel slag-based carbonization and a method for using the admixture. The admixture comprises the following raw materials as shown in Table 11, in parts by weight:

[0125] Table 11: Comparative Example 6 Admixture Components

[0126]

[0127] The method for using the above-mentioned admixture comprises the following steps:

[0128] Step S1, at room temperature, according to the above weight parts, disodium ethylenediaminetetraacetate, potassium carbonate, acetic acid, 2-hydroxysuccinic acid and water are fully mixed to obtain an additive solution.

[0129] Step S2, adding steel slag in a ratio of 1:5 between the mass of the additive solution and the mass of the steel slag, stirring evenly, and then placing it in a carbonization kettle for carbonization, the carbonization conditions are: carbonization temperature 30-70°C, carbonization pressure 0.02-0.04MPa, carbonization time 0.5-1.0h, CO2 concentration 70%, and obtaining the finished product L after the carbonization is completed.

[0130] Comparative Example 7

[0131] This comparative example provides an admixture for steel slag-based carbonization and a method for using the admixture. The admixture comprises the following raw materials as shown in Table 12, in parts by weight:

[0132] Table 13: Comparative Example 7 Admixture Components

[0133]

[0134] The method for using the above-mentioned admixture comprises the following steps:

[0135] Step S1, at room temperature, according to the above weight parts, ethylenediaminetetraacetic acid, potassium carbonate, acetic acid, 2-hydroxysuccinic acid and water are fully mixed to obtain an additive solution.

[0136] Step S2, adding steel slag in a ratio of 1:5 between the mass of the additive solution and the mass of the steel slag, stirring evenly, and then placing it in a carbonization kettle for carbonization, the carbonization conditions are: carbonization temperature 30-70°C, carbonization pressure 0.02-0.04MPa, carbonization time 0.5-1.0h, CO2 concentration 90%-100%, and obtaining the finished product M after carbonization is completed.

[0137] Test example

[0138] This test example tests the carbon fixation, 3d activity, 28d activity and stability of the finished products A to M prepared by using the additives of the above-mentioned Examples 1 to 6 and Comparative Examples 1 to 7. Among them:

[0139] The detection of carbon fixation is expressed as the loss on ignition at 600°C and 900°C, where the purpose of the 600°C treatment is to remove moisture from the finished product;

[0140] The detection methods of 3d and 28d activity refer to GB / T 51003-2014 "Technical Specifications for Application of Mineral Admixtures";

[0141] The stability test method refers to GB / T 1346 2011 "Water consumption, setting time and stability of cement of standard consistency".

[0142] The test results are shown in Table 14.

[0143] Table 14: Carbon fixation and physical properties of the examples and comparative examples

[0144]

[0145] The test results show that compared with comparative example 1 (only water is added), the admixtures prepared in Examples 1, 2, 3, 4, 5, 6 and 7 of the present invention can significantly increase the carbon fixation amount, 3d and 28d activity indexes of steel slag, while ensuring that the stability of steel slag is qualified, showing good application effects. Among them, the carbon fixation amount of steel slag doped with the admixture of Example 3 of the present invention is increased by 38.15%, the 3d activity index is increased by 16.76%, and the 28d activity index is increased by 10.63% compared with comparative example 1.

[0146] Further, by comparing Comparative Examples 2, 3, 4 and 5 of the present invention, it is known that the admixture of the present invention requires disodium ethylenediaminetetraacetic acid, potassium carbonate, polycarboxylic acid and water to act together to obtain better slag carbon fixation, 3d and 28d activity index. By Comparative Example 6, it can be found that when the steel slag to which the admixture is added reduces the concentration of carbon dioxide during carbonization, its carbon fixation will be caused to decrease, and 3d and 28d activity indexes are also significantly reduced, which is speculated to be related to the uneven carbonization layer caused by insufficient supply of carbon atoms. In addition, the present invention finds that when the main component of the admixture of the present invention is replaced with ethylenediaminetetraacetic acid, the carbon fixation of its steel slag will also decrease significantly, which is speculated to be related to complexation.

[0147] In summary, the present invention provides an admixture for improving the carbon fixation and activity of steel slag-based carbonized cementitious materials and a method for using the admixture. The admixture group is mainly composed of disodium ethylenediaminetetraacetic acid, potassium carbonate, an auxiliary complexing component and water, and the auxiliary complexing component is a polycarboxylic acid, and the polycarboxylic acid is selected from at least one of acetic acid, 2-hydroxysuccinic acid and polyacrylic acid. In addition, the present invention also provides the application of the admixture in steel slag carbonization, specifically including first compounding the admixture components and mixing them with water to form a liquid, then mixing them with steel slag, and obtaining a steel slag-based carbonized cementitious material after carbonization. Through comparative experiments, it was found that when the admixture of the present invention was added in an amount of 0.5% to 1.5% of the weight of the steel slag, the carbon fixation of the steel slag was increased by 20% to 40% compared with that when only water was added (Comparative Example 1), the 3d activity index of the steel slag was increased by 5% to 17%, and the 28d activity index was increased by 5% to 10%, while ensuring that the stability of the steel slag was qualified.

[0148] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A method for carbon fixation in steel slag, characterized in that: The method comprises contacting an admixture with steel slag and subjecting the mixture to carbonization treatment, wherein the admixture is prepared from the following raw materials in parts by weight: The temperature of the carbonization treatment is 30-70° C., the time is 0.5-2 h, the pressure is 0.02-0.04 MPa, and the CO2 concentration is 90%-100%.

2. A steel slag carbonized cementitious material, characterized in that: The preparation raw materials include additives and steel slag, and the preparation method includes adopting the steel slag carbon fixation method as claimed in claim 1.

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