Apparatus and method for carbon dioxide fixation of steel slag

Abstract

This application relates to the field of industrial waste recycling, specifically to an apparatus and method for carbon dioxide fixation of steel slag. The apparatus for carbon dioxide fixation of steel slag includes an apparatus main body, a spray device provided at the top of the apparatus main body, and an exhaust port. The apparatus main body is further provided with a supply port, a discharge port, and an intake port. A conveying unit is provided inside the apparatus main body, and the conveying unit includes multiple conveying mechanisms. The apparatus can achieve carbon dioxide fixation of steel slag by injecting carbon dioxide-containing industrial exhaust gas into the steel slag while maintaining an ambient humidity of 80-100%. By controlling the ambient humidity, the present application maintains the moisture content of the steel slag during the reaction with carbon dioxide, shortens the contact time between water and the steel slag, prevents the elution of calcium element from the steel slag, and forms a water film on the surface of the steel slag without interfering with the reaction between carbon dioxide and free calcium oxide in the steel slag, thereby allowing the reaction between carbon dioxide and free calcium oxide to proceed more efficiently.

Description

[Technical Field]

[0001] [Cross-Reference to Related Applications] The present application claims the priority of the Chinese patent application with the application number 202310911825.8 and entitled "Apparatus and Method for Carbon Dioxide Sequestration of Iron and Steel Slag", filed with the China National Intellectual Property Administration on July 24, 2023, the entire content of which is incorporated into the present application by reference.

[0002] [Technical Field] The present application relates to the field of resource utilization of industrial waste, and specifically to an apparatus and method for carbon dioxide sequestration of iron and steel slag. [Background Art]

[0003] Iron and steel slag is one of the main by-products of the iron and steel manufacturing process. A large amount of iron and steel slag is generated every year, but 60% of it has not been effectively utilized, so the resource utilization of iron and steel slag is of great significance. The main factor restricting the resource utilization of iron and steel slag is that iron and steel slag contains a large amount of unstable free calcium oxide. On one hand, due to the high content of free calcium oxide in iron and steel slag, iron and steel slag is prone to expansion and pulverization, resulting in poor volume stability. Furthermore, when iron and steel slag is used in road engineering, it causes a series of quality problems such as expansion and cracking of pavement. On the other hand, the effect of reducing free calcium oxide in iron and steel slag is unstable, and it is difficult to maintain the content at a low level. At present, reacting carbon dioxide with free calcium oxide in iron and steel slag to form calcium carbonate can not only effectively improve the stability of iron and steel slag and expand the application range of iron and steel slag, but also reduce carbon dioxide emissions, which has the dual advantages of reducing carbon dioxide emissions and recycling solid waste.

[0004] Conventional technologies have disclosed methods for CO2 fixation and the digestion of free calcium oxide in steel slag powder, mainly by stably reacting immersed steel slag with waste heat flue gas containing carbon dioxide in a mill to achieve carbon dioxide fixation and digestion of free calcium oxide. However, this method has drawbacks: immersion of steel slag leaves excess water on the surface, forming a water film that hinders contact between carbon dioxide and free calcium oxide in the steel slag; immersion of steel slag causes the leaching of other calcium elements besides free calcium oxide; wastewater after immersion needs to be retreated, leading to increased resource utilization costs; and the loss of calcium elements reduces the carbon dioxide fixation rate of the steel slag. [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] Therefore, the technical problem that this application seeks to solve is to provide a carbon dioxide fixation apparatus and method for steel slag that improves the carbon dioxide fixation rate of steel slag in order to overcome the shortcomings of the prior art, which include the formation of a water film by immersion in steel slag, which hinders contact between carbon dioxide and free calcium oxide in the steel slag, leading to increased wastewater retreatment costs, and the loss of calcium elements in the steel slag resulting in a low carbon dioxide fixation rate of steel slag. [Means for solving the problem]

[0006] In one embodiment, the present invention provides a carbon dioxide fixation apparatus for steel slag, comprising a main body, a spray device provided on the upper part of the structure of the main body, and an exhaust port, wherein the main body is further provided with a supply port, an outlet port, and an intake port, the position of the supply port is higher than the position of the outlet port, the intake port is located between the supply port and the outlet port, and a transport unit is provided inside the main body, the transport unit includes a plurality of transport mechanisms.

[0007] In another embodiment, the present invention provides a method for fixing carbon dioxide from steel slag, comprising the step of injecting carbon dioxide-containing industrial exhaust gas into steel slag under environmental humidity conditions of 80 to 100%.

[0008] The aforementioned carbon dioxide-containing industrial exhaust gas further contains SO2, with the volume content of SO2 being optionally 100-300 ppm.

[0009] The aforementioned ambient humidity is controlled by the amount of spray water dispensed.

[0010] The amount of industrial exhaust gas injected is 150,000 to 230,000 m³. 3 The supply rate of the aforementioned steel slag is 1 to 1.5 t / h.

[0011] The volume content of CO2 in the aforementioned carbon dioxide-containing industrial exhaust gas is ≥10%, and optionally, the volume content of CO2 is ≥25%, and the temperature of the industrial exhaust gas is 100-200°C.

[0012] During the reaction process between the aforementioned steel slag and the carbon dioxide-containing industrial exhaust gas, the pressure intensity is 1 to 1.5 atm.

[0013] The contact time between the steel slag and the carbon dioxide-containing industrial exhaust gas is 0.5 to 2 hours, and the transport speed of the steel slag is 0.5 to 1.5 m / min.

[0014] The particle size of 50% or more of the steel slag is ≤80 μm, the water content of the steel slag before supply is 5-15%, and the water is at least one of industrial wastewater or recycled water.

[0015] Steel slag obtained by the carbon dioxide fixation apparatus for steel slag according to this application, or steel slag obtained by the carbon dioxide fixation method for steel slag according to this application, can be applied to building materials or road construction materials. [Effects of the Invention]

[0016] The present invention has the following advantages:

[0017] 1. The carbon dioxide fixation apparatus for steel slag according to the present invention includes an apparatus body, a spray device provided on the upper part of the structure of the apparatus body, and an exhaust port. The apparatus body is further provided with a supply port, an outlet port, and an intake port, the position of the supply port is higher than the position of the outlet port, and the intake port is located between the supply port and the outlet port. A transport unit is provided inside the apparatus body, and the transport unit includes a plurality of transport mechanisms. In this invention, the spray device is provided on the upper part of the apparatus body to facilitate spraying water inside the apparatus and to ensure that the ambient humidity inside the apparatus meets the requirements. Furthermore, the intake port is provided between the supply port and the outlet port to ensure that industrial exhaust gas comes into sufficient contact with the steel slag supplied from the supply port, thereby preventing the industrial exhaust gas injected into the apparatus from overflowing from the gas outlet without reacting with the steel slag. In addition, in this invention, a transport unit formed from a plurality of transport mechanisms is provided, and by controlling the transport speed of each transport mechanism, it is possible to ensure the reaction time between the steel slag and the industrial exhaust gas inside the apparatus.

[0018] 2. The carbon dioxide fixation method for steel slag according to the present invention includes the step of injecting carbon dioxide-containing industrial exhaust gas into steel slag under environmental humidity conditions of 80-100%. By controlling the environmental humidity, the present invention maintains the water content of the steel slag during the reaction process with carbon dioxide, reduces the amount of contact between water and steel slag, avoids the leaching of calcium elements from the steel slag, thereby allowing the carbon dioxide fixation reaction of the steel slag to proceed sufficiently, and does not form a water film on the surface of the steel slag that hinders the reaction between carbon dioxide and free calcium oxide in the steel slag. By maintaining the environmental humidity, the present invention can allow the reaction between carbon dioxide and free calcium oxide in the steel slag to proceed more sufficiently.

[0019] 3. According to the carbon dioxide fixation method for iron and steel slag according to the present application, in addition to carbon dioxide, sulfur dioxide is further contained in the industrial exhaust gas that reacts with free calcium oxide in the iron and steel slag. The present application injects industrial exhaust gas containing sulfur dioxide and carbon dioxide to react with the iron and steel slag. Due to the addition of sulfur dioxide, the generated sulfurous acid and sulfuric acid can react with compounds on the surface of the iron and steel slag and dissolve to form gaps, thereby allowing carbon dioxide to penetrate deeper into the iron and steel slag and react with free calcium oxide inside the iron and steel slag, improving the efficiency of carbon dioxide fixation.

[0020] 4. According to the carbon dioxide fixation method for iron and steel slag according to the present application, in the carbon dioxide fixation process of iron and steel slag, while spraying water droplets, the conveying speed of iron and steel slag is controlled to 0.5~1.5m / min, and the contact time between the iron and steel slag and industrial exhaust gas is controlled to 0.5~2h, so that the iron and steel slag can be sufficiently contacted with the sprayed water droplets, it is ensured that the moisture content of the iron and steel slag that reacts with the industrial exhaust gas containing carbon dioxide meets the standard, and the reaction efficiency of carbon dioxide fixation of the iron and steel slag is improved.

[0021] 5. According to the carbon dioxide fixation method for iron and steel slag according to the present application, the iron and steel slag after carbon dioxide fixation has a low content of free calcium oxide, can be applied to building materials or materials for road construction, has a simple carbon dioxide fixation process, and can effectively consume industrial exhaust gas and industrial reclaimed water. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly describe the specific embodiments of the present application or the technical solutions of the prior art, the drawings required for the description of the specific embodiments or the prior art are briefly described below. Obviously, the drawings described below are several embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0023] [Figure 1] It is a structural schematic diagram of the carbon dioxide fixation device for iron and steel slag of the present application. Description of Embodiments for Carrying Out the Invention

[0024] The following examples are provided for a better understanding of the present application, but are not limited to the optimal embodiments described, do not constitute a limitation on the content and protection scope of the present application, and any products that are the same or similar to the present application obtained under the inspiration of the present application or by combining the present application with features of other prior art shall all fall within the protection scope of the present application.

[0025] If specific experimental procedures or conditions are not indicated in the examples, the operations may be carried out in accordance with conventional experimental procedures or conditions described in literature in the art. If the manufacturers of reagents or instruments used are not indicated, they are all conventional reagent products that are commercially available.

[0026] The present application provides an apparatus for carbon dioxide fixation using steel slag. As shown in FIG. 1, the apparatus for carbon dioxide fixation using steel slag comprises an apparatus main body 6, a spraying device 4 and an exhaust port 5 provided at the upper part of the structure of the apparatus main body 6, wherein the apparatus main body 6 is further provided with a feed port 3, a discharge port 1 and an intake port 2; the position of the feed port 3 is higher than that of the discharge port 1, and the intake port 2 is located between the feed port 3 and the discharge port 1; a conveying unit 7 is provided inside the apparatus main body 6, and the conveying unit 7 comprises a plurality of conveying mechanisms. In use, steel slag with a moisture content meeting requirements is put into the conveying mechanisms through the feed port 3, and the arrangement angle of the conveying mechanisms can be adjusted arbitrarily, thereby ensuring that the steel slag is laid as thinly as possible on the conveying mechanisms; the conveying mechanisms convey the steel slag, during conveying, industrial exhaust gas containing carbon dioxide or containing carbon dioxide and sulfur dioxide is injected through the intake port 2, reclaimed water or industrial wastewater is sprayed through the spraying device 4 to maintain the environmental humidity inside the apparatus main body 6, and the steel slag after carbon dioxide fixation is discharged through the discharge port 1.

[0027] Specifically, the feeding method of the present application can adopt screw feeding, conveying feeding, vibration feeding or the like, preferably the vibration feeding method. By maintaining a constant vibration frequency, the steel slag can be laid more uniformly on the conveying unit 7.

[0028] Specifically, the discharge method of this application can employ screw discharge, conveying discharge, or vibration discharge, and preferably is the vibration discharge method, which is more advantageous for the discharge of steel slag and avoids the steel slag adhering to the discharge port 1 due to excessive humidity.

[0029] Specifically, this invention does not limit the type, material, number, or installation location of the conveying mechanism of the conveying unit 7, as long as it can convey steel slag. The angle between each conveying mechanism and the horizontal line is set as the inclination angle of the conveying mechanism, and the inclination angle of the conveying mechanism can be adjusted arbitrarily, thereby ensuring that the steel slag is laid as thinly as possible on the conveying mechanism. The conveying mechanism of the present invention may be a conveyor belt, and each conveyor belt is provided with protrusions to increase the frictional force between the belt and the steel slag, and each conveyor belt is provided at a constant inclination angle, thereby causing the steel slag on the previous conveyor belt to fall onto the next conveyor belt under the action of gravity, and the present invention provides one selectable embodiment in which the conveying mechanism is two conveyor belts, one end of the first conveyor belt is provided at a supply port and used to receive steel slag from the supply port 3, the other end of the first conveyor belt is provided above one end of the second conveyor belt, and the second conveyor belt is used to receive the steel slag on the first conveyor belt and convey it to the discharge port 1, and by providing two conveyor belts, the steel slag can be laid more evenly and the steel slag can be brought into sufficient contact with industrial exhaust gas.

[0030] Specifically, this application does not limit the type, installation location, or number of spray devices 4, as long as the ambient humidity inside the device can be maintained at 80-100%, and the spray devices 4 are selectable to be multiple droplet spray devices, uniformly installed at the top of the device to ensure uniform ambient humidity inside the device.

[0031] In the examples and comparative examples of this application, the initial free calcium oxide content of the steel slag before carbon dioxide fixation was 8%, the chlorine content was 0.015%, and the sulfur content was 0.07%.

[0032] Example 1 This embodiment provides a method for fixing carbon dioxide from steel slag, and the specific steps and method are as follows.

[0033] 1. Before supply, the amount of steel slag with a particle size of ≤80 μm was controlled to 50%, and the water content of the steel slag was maintained at 10% during supply. The water content of the steel slag was controlled by spraying water onto the steel slag.

[0034] 2. The supply rate of steel slag was 1 ton / hour, and the inclination angle of the conveying mechanism was controlled to 15°.

[0035] 3. Regenerated water droplets are continuously sprayed into the device to maintain a humidity of 80%, while simultaneously blowing in CO2-containing industrial exhaust gas. The volume ratio of CO2 in the CO2-containing industrial exhaust gas is ≥25%, and the injection volume of industrial exhaust gas is 150,000 m³. 3 The parameters were / h, the industrial exhaust gas temperature was 150°C, and the pressure strength of the device body was 1.5 atm.

[0036] 4. The conveying speed of the conveying mechanism was controlled to 1 m / min, and the operating time of the steel slag inside the device was set to 1 hour, meaning that the contact time between the steel slag inside the device and the industrial exhaust gas was 1 hour.

[0037] Example 2 This embodiment provides a method for fixing carbon dioxide from steel slag, and the specific steps and method were as follows.

[0038] 1. Before supply, the amount of steel slag with a particle size of ≤80 μm was controlled to 70%, and the water content of the steel slag was maintained at 5% during supply. The water content of the steel slag was controlled by spraying water onto the steel slag.

[0039] 2. The supply rate of steel slag was 1.5 t / h, and the inclination angle of the conveying mechanism was controlled to 25°.

[0040] 3. Industrial wastewater droplets are continuously sprayed into the device to maintain a humidity of 100%, while simultaneously blowing in CO2-containing industrial exhaust gas. The volume ratio of CO2 in the CO2-containing industrial exhaust gas is ≥30%, and the injection volume of industrial exhaust gas is 200,000 m³. 3 The parameters were / h, the industrial exhaust gas temperature was 200°C, and the pressure inside the device was 1 atm.

[0041] 4. The conveying speed of the conveying mechanism was controlled to 1.5 m / min, and the operating time of the steel slag inside the device was set to 2 hours, meaning that the contact time between the steel slag inside the device and the industrial exhaust gas was 2 hours.

[0042] Example 3 This embodiment provides a method for fixing carbon dioxide from steel slag, and the specific steps and method are as follows.

[0043] 1. Before supply, the amount of steel slag with a particle size of ≤80 μm was controlled to 50%, and the water content of the steel slag was maintained at 10% during supply. The water content of the steel slag was controlled by spraying water onto the steel slag.

[0044] 2. The supply rate of steel slag was 1 ton / hour, and the inclination angle of the conveying mechanism was controlled to 15°.

[0045] 3. Regenerated water droplets are continuously sprayed into the device to maintain a humidity of 80%, while simultaneously blowing in CO2-containing industrial exhaust gas. The volume ratio of CO2 in the CO2-containing industrial exhaust gas is ≥25%, the volume content of SO2 is 150 ppm, and the injection volume of industrial exhaust gas is 150,000 m³. 3 The parameters were / h, the industrial exhaust gas temperature was 150°C, and the pressure strength of the device body was 1.5 atm.

[0046] 4. The conveying speed of the conveying mechanism was controlled to 1 m / min, and the operating time of the steel slag inside the device was set to 1 hour, meaning that the contact time between the steel slag inside the device and the industrial exhaust gas was 1 hour.

[0047] Example 4 This embodiment provides a method for fixing carbon dioxide from steel slag, and the specific steps and method were as follows.

[0048] 1. Before supply, the amount of steel slag with a particle size of ≤80 μm was controlled to 50%, and the water content of the steel slag was maintained at 15% during supply. The water content of the steel slag was controlled by spraying water onto the steel slag.

[0049] 2. The supply rate of steel slag was 1.2 t / h, and the inclination angle of the conveying mechanism was controlled to 15°.

[0050] 3. Industrial wastewater droplets are continuously sprayed into the apparatus to maintain a humidity of 90%, while simultaneously blowing in CO2-containing industrial exhaust gas. The volume ratio of CO2 in the CO2-containing industrial exhaust gas is ≥10%, the volume content of SO2 is 250 ppm, and the injection volume of industrial exhaust gas is 230,000 m³. 3 The industrial exhaust gas temperature was 100°C, and the pressure inside the device was 1.2 atm.

[0051] 4. The conveying speed of the conveying mechanism was controlled to 0.5 m / min, and the operating time of the steel slag inside the device was set to 0.5 hours, meaning that the contact time between the steel slag inside the device and the industrial exhaust gas was 0.5 hours.

[0052] Example 5 This embodiment provides a method for fixing carbon dioxide from steel slag, and the specific steps and method are the same as in Example 3, except that the volume content of SO2 in the industrial exhaust gas is 300 ppm.

[0053] Example 6 This embodiment provides a method for fixing carbon dioxide from steel slag, and the specific steps and method are the same as in Example 1, except that the moisture content of the supplied steel slag is controlled by immersion.

[0054] Example 7 This embodiment provides a method for fixing carbon dioxide from steel slag, and the specific steps and method are as follows.

[0055] Before supply, the amount of steel slag with a particle size of ≤80μm is controlled to 70%, and the moisture content of the steel slag is maintained at 5% during supply. The moisture content of the steel slag is controlled by spraying water onto the steel slag. Using the structure shown in Figure 1, according to the supply rate of 1 t / h, steel slag with a moisture content that meets the standard is conveyed to the conveying mechanism through the supply port 3. The conveying mechanism consists of two conveyor belts, and the inclination angle of both conveyor belts is controlled to 25°, thereby conveying the steel slag at the discharge port 1. The steel slag can be spread evenly on the conveyor belt, and under the influence of gravity, the steel slag on the previous conveyor belt can be dropped onto the next conveyor belt. While the steel slag is being transported within the device body 6, the spray device 4 continuously sprays recycled water droplets into the device body 6 to maintain a humidity of 100%. At the same time, the air intake 2 blows CO2-containing industrial exhaust gas into the device body 6, with the CO2 content in the CO2-containing industrial exhaust gas being ≥ 15%, and the amount of industrial exhaust gas injected is 150,000 m³. 3 The conveying speed of each conveyor belt was controlled to 1.5 m / min, the operating time of the steel slag inside the device body 6 was set to 2 hours, and the steel slag after carbon dioxide fixation was discharged from the discharge port 1.

[0056] Comparative Example 1 The comparative example of the present invention provides a method for fixing carbon dioxide from steel slag, and the specific steps and method are the same as in Example 1, except that the environmental humidity inside the carbon dioxide fixing apparatus for steel slag is maintained at 60%.

[0057] Comparative Example 2 The comparative example of the present invention provides a method for fixing carbon dioxide from steel slag, and the specific steps and method are the same as in Example 1, except that spraying is not performed during the carbon dioxide fixation process of steel slag.

[0058] Experimental example In Examples 1-5 and Comparative Examples 1-2, the free calcium oxide content, chlorine content, and sulfur content of steel slag treated by the carbon dioxide fixation method were detected. The detection method used was YB / T140-2009 "Chemical Analysis Method for Steel Slag," and the detection results are shown in Table 1.

[0059] [Table 1]

[0060] In Examples 1-5 of this application, the free calcium oxide, chlorine, and sulfur content of the steel slag treated by the carbon dioxide fixation method for steel slag all met the requirements for the chemical composition of steel slag powder in national standards GB / T20491-2017. Furthermore, the free calcium oxide content of the steel slag produced by this method was found to be far lower than the specified standard, indicating that the steel slag produced by this method also has broader applicability.

[0061] As is clear, the above embodiments are merely illustrative examples and do not limit the embodiments. Those skilled in the art can make various other modifications and variations based on the above description. It is neither necessary nor possible to cover all embodiments here. Obvious modifications and variations derived therefrom still fall within the scope of the present invention. [Explanation of symbols]

[0062] 1-Discharge port, 2-Intake port, 3-Supply port, 4-Spray device, 5-Exhaust port, 6-Device body, 7-Conveyor unit.

Claims

1. A carbon dioxide fixation apparatus for steel slag, comprising an apparatus body (6), a spray device (4) and an exhaust port (5) provided on the upper part of the structure of the apparatus body (6), wherein the apparatus body (6) is further provided with a supply port (3), an outlet port (1) and an intake port (2), the position of the supply port (3) is higher than the position of the outlet port (1), the intake port (2) is located between the supply port (3) and the outlet port (1), and a transport unit (7) is provided inside the apparatus body (6), the transport unit (7) includes a plurality of transport mechanisms. The spray device (4) is configured to spray at least one substance selected from the group consisting of industrial wastewater and recycled water into the interior of the device body (6) in order to maintain the ambient humidity inside the device body (6) at 80 to 100%. The supply port (3) is configured to receive steel slag and introduce the steel slag onto the conveying mechanism of the conveying unit (7). The transport mechanism is configured to transport the steel slag introduced from the supply port (3) and to transport the steel slag to the discharge port (1), while simultaneously causing a carbon dioxide fixation reaction to occur in the steel slag under the environmental humidity conditions within the apparatus body (6). The discharge port (1) is configured to discharge the steel slag after the carbon dioxide fixation reaction, The intake port (2) is configured to introduce carbon dioxide-containing industrial exhaust gas into the main body (6) of the device. The carbon dioxide fixation apparatus for steel slag is characterized in that the exhaust port (5) is configured to discharge the industrial exhaust gas that has reacted with the steel slag.

2. A method for fixing carbon dioxide from steel slag using the carbon dioxide fixation apparatus described in claim 1, A method for fixing carbon dioxide from steel slag, characterized by comprising the step of injecting industrial exhaust gas containing carbon dioxide into steel slag under environmental humidity conditions of 80 to 100%.

3. The aforementioned carbon dioxide-containing industrial exhaust gas contains SO 2 It also includes SO 2 The method for fixing carbon dioxide from steel slag according to claim 2, characterized in that the volume content of is 100 to 300 ppm.

4. The method for fixing carbon dioxide from steel slag according to claim 3, characterized in that the ambient humidity is controlled by the amount of sprayed water.

5. The injection volume of the aforementioned industrial exhaust gas is 150,000 to 230,000 m³. 3 / h and / or, The method for fixing carbon dioxide from steel slag according to claim 4, characterized in that the supply amount of the steel slag is 1 to 1.5 t / h.

6. CO in the aforementioned carbon dioxide-containing industrial exhaust gas 2 The volume content is ≥10%, The method for fixing carbon dioxide from steel slag according to claim 5, characterized in that the temperature of the industrial exhaust gas is 100 to 200°C.

7. The method for fixing carbon dioxide from steel slag according to claim 6, wherein the volume content of CO2 is ≥ 25%.

8. The method for fixing carbon dioxide from steel slag according to claim 6, characterized in that the pressure strength of the apparatus body (6) is 1 to 1.5 atm during the reaction process between the steel slag and the carbon dioxide-containing industrial exhaust gas.

9. The contact time between the steel slag and the carbon dioxide-containing industrial exhaust gas is 0.5 to 2 hours, and / or, The method for fixing carbon dioxide from steel slag according to any one of claims 2 to 8, characterized in that the conveying speed of the steel slag is 0.5 to 1.5 m / min.

10. The particle size of 50% or more of the steel slag is ≤80 μm, and / or, The method for fixing carbon dioxide from steel slag according to claim 9, characterized in that the moisture content of the steel slag before supply is 5 to 15%.

11. Use of steel slag obtained by the carbon dioxide fixation method for steel slag according to any one of Claims 2 to 8 in building materials or road construction materials.

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