Carbon dioxide fixation method and carbon dioxide fixation container

Abstract

This invention provides a carbon dioxide fixation method that reduces the workload involved in fixing carbon dioxide into cementitious hardened materials. [Solution] The carbon dioxide fixation method of the present invention comprises the steps of: (a) placing a cementitious hardened body in a carbon dioxide fixation container 10; (b) transporting the fixation container 10 containing the cementitious hardened body by vehicle to a carbon dioxide-containing gas supply location; (c) supplying carbon dioxide-containing gas to the fixation container 10 containing the cementitious hardened body at the carbon dioxide-containing gas supply location to fix carbon dioxide in the cementitious hardened body; and (d) transporting the fixation container 10 containing the cementitious hardened body with carbon dioxide fixed from the carbon dioxide-containing gas supply location to another location by vehicle.

Description

Technical Field

[0001] The present invention relates to a carbon dioxide fixation method and a carbon dioxide fixation container.

Background Art

[0002] In suppressing global warming, it is an important issue to suppress the emissions of carbon dioxide gas, which is a greenhouse gas.

[0003] In relation to this, Patent Document 1 below discloses a carbon dioxide fixation device for fixing carbon dioxide to a cementitious hardened body. The fixation device of Patent Document 1 includes a reaction part for fixing carbon dioxide to a cementitious hardened body, a cementitious hardened body supply part for supplying the cementitious hardened body to the reaction part, a carbon dioxide-containing gas supply part for supplying a carbon dioxide-containing gas to the reaction part, and a water vapor supply part for supplying water vapor to the reaction part. According to the fixation device having such a configuration, carbon dioxide can be efficiently fixed to a cementitious hardened body such as waste concrete.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above fixation device, the reaction part is constituted by a rotary kiln, and carbon dioxide is fixed to the cementitious hardened body inside the rotary kiln. Therefore, when fixing carbon dioxide to waste concrete using the above fixation device, it is necessary to unload the waste concrete carried in by truck to the yard inside the facility equipped with a rotary kiln once, and then reload and carry out the waste concrete to which carbon dioxide has been fixed onto the truck again, and there is a problem that the work load is large.

[0006] This invention has been made in view of the above-mentioned problems. Therefore, the object of this invention is to provide a carbon dioxide fixation method and a carbon dioxide fixation container that can reduce the workload when fixing carbon dioxide into cementitious hardened materials such as waste concrete. [Means for solving the problem]

[0007] The above objectives of the present invention are achieved by the following means.

[0008] A carbon dioxide fixation method comprising: (1) a step of placing a cementitious hardened body in a carbon dioxide fixation container (a); a step of transporting the fixation container containing the cementitious hardened body by vehicle to a carbon dioxide-containing gas supply location (b); a step of supplying carbon dioxide-containing gas to the fixation container containing the cementitious hardened body at the carbon dioxide-containing gas supply location to fix carbon dioxide in the cementitious hardened body in the fixation container (c); and a step of transporting the fixation container containing the cementitious hardened body with the fixed carbon dioxide from the carbon dioxide-containing gas supply location to another location by vehicle (d).

[0009] (2) The carbon dioxide fixation method according to (1) above, wherein the fixation container comprises a container body for containing the cementitious hardened body and a lid covering the container body, and the container body or the lid is provided with a first supply port for supplying carbon dioxide-containing gas to the space defined by the container body and the lid, and in step (c), carbon dioxide-containing gas is supplied to the space from the first supply port.

[0010] (3) The carbon dioxide fixation method according to (2) above, wherein the container body or the lid is further provided with a second supply port for supplying water vapor to the space, and in step (c), water vapor is further supplied to the space from the second supply port.

[0011] (4) The carbon dioxide fixation method according to (3), wherein the fixation container is provided with a hygrometer for detecting the humidity of the space, and in step (c), the amount of water vapor supplied is adjusted based on the humidity of the space.

[0012] (5) The carbon dioxide fixation method according to (4), wherein the fixation container is provided with a thermometer for detecting the temperature of the space, and in step (c), the amount of water vapor supplied is adjusted based on the temperature of the space.

[0013] (6) The carbon dioxide fixation method according to any one of (2) to (5) above, wherein the container body or the lid is provided with a safety valve for maintaining the pressure in the space below a predetermined pressure.

[0014] (7) The carbon dioxide fixation method according to any one of (1) to (5) above, wherein in step (a), the cementitious hardened bodies of the same size are housed in the fixation container.

[0015] (8) The carbon dioxide fixation method according to any one of (1) to (5) above, wherein the other location is the location where the cementitious hardened body is used.

[0016] (9) The carbon dioxide fixation method described in (8) above, wherein the place of use of the cementitious hardened body and the place of supply of the carbon dioxide-containing gas are located in the same area.

[0017] (10) The carbon dioxide fixation method according to any one of (1) to (5) above, wherein in step (b), the exhaust gas of the vehicle is supplied to the fixation container.

[0018] (11) The carbon dioxide fixation method according to any one of (1) to (5) above, wherein the cementitious hardened body includes waste concrete or a dewatered cake of concrete sludge.

[0019] (12) A carbon dioxide immobilization container that can be transported by a vehicle, comprising a container main body for accommodating a cementitious hardened body and a lid portion for covering the container main body, wherein a supply port for supplying a carbon dioxide-containing gas is provided in the space defined by the container main body and the lid portion on the container main body or the lid portion.

Effects of the Invention

[0020] According to the present invention, since carbon dioxide is immobilized in the cementitious hardened body in the carbon dioxide immobilization container for transporting the cementitious hardened body, when immobilizing carbon dioxide in the cementitious hardened body, it is not necessary to take out the cementitious hardened body from the immobilization container or to re-accommodate the cementitious hardened body in which carbon dioxide is immobilized in the immobilization container. That is, the working load when immobilizing carbon dioxide in the cementitious hardened body is reduced.

Brief Description of the Drawings

[0021] [Figure 1] It is a diagram showing a schematic configuration of a carbon dioxide immobilization system. [Figure 2] It is a diagram showing the flow of reuse of waste concrete. [Figure 3] It is a diagram for explaining the local production for local consumption of waste concrete.

Modes for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and duplicate descriptions are omitted. Also, the dimensional ratios in the drawings are exaggerated for the convenience of explanation and may be different from the actual ratios.

[0023] The cementitious hardened body in this specification means a hardened body formed by the hardening of a composition containing cement and water, and for example, a hardened body made of concrete, a hardened body made of mortar, a hardened body made of cement paste, etc. Also, the term "cementitious hardened body" shall include not only a completely hardened hardened body but also a semi-hardened hardened body (in other words, a body in which hardening is in progress).

[0024] FIG. 1 is a diagram showing a schematic configuration of a carbon dioxide fixation system 1 to which a carbon dioxide fixation container (hereinafter simply referred to as "fixation container") according to an embodiment of the present invention is applied. Hereinafter, the case of fixing carbon dioxide to waste concrete will be described as an example.

[0025] As shown in FIG. 1, the carbon dioxide fixation system 1 has a fixation container 10, a carbon dioxide supply facility 20, and a steam supply facility 30. The fixation container 10 houses waste concrete after crushing (crushed waste concrete). The carbon dioxide supply facility 20 is connected to the fixation container 10 through a gas pipe 21 and supplies a carbon dioxide-containing gas to the fixation container 10. The steam supply facility 30 is connected to the fixation container 10 through a steam pipe 31 and supplies steam to the fixation container 10.

[0026] The fixation container 10 is configured to be loaded onto a vehicle such as a truck. The fixation container 10 is filled with crushed waste concrete at a crushing site such as a crushing plant, and the fixation container 10 filled with crushed waste concrete is transported by a vehicle from the crushing site to a place where the carbon dioxide supply facility 20 and the steam supply facility 30 are located (a place for supplying the carbon dioxide-containing gas).

[0027] <Fixation container 10> The fixation container 10 has a container body portion 11 that houses crushed waste concrete and a lid portion 12 that covers the container body portion 11. The container body portion 11 and the lid portion 12 are made of a metal plate such as a steel plate, and the lid portion 12 is configured to be able to seal the internal space defined by the container body portion 11 and the lid portion 12.

[0028] A first valve 13, a second valve 14, and a thermometer / hygrometer 15 are provided on the side of the container body 11. The first valve 13 adjusts the amount of carbon dioxide-containing gas supplied to the stationary container 10 through the gas piping 21. The second valve 14 adjusts the amount of water vapor supplied to the stationary container 10 through the water vapor piping 31. The thermometer / hygrometer 15 detects the temperature and humidity inside the stationary container 10.

[0029] The lid 12 is provided with a safety valve 16 for maintaining the internal pressure of the immobilized container 10 below a predetermined pressure. The safety valve 16 automatically activates when the internal pressure of the immobilized container 10 rises to the predetermined pressure, releasing carbon dioxide-containing gas and water vapor inside the immobilized container 10 into the atmosphere.

[0030] Unlike this embodiment, the lid portion 12 may be provided with piping for returning the carbon dioxide-containing gas discharged from the safety valve 16 back to the gas piping 21. Furthermore, multiple first valves 13 may be provided on the side of the container body portion 11, allowing carbon dioxide-containing gas to be supplied to the inside of the immobilization container 10 from multiple locations. A carbon dioxide gas concentration meter may also be installed in the immobilization container 10. By installing a carbon dioxide gas concentration meter, it becomes possible to increase the supply of carbon dioxide-containing gas when the carbon dioxide concentration inside the immobilization container 10 decreases, or to determine the amount of carbon dioxide immobilized in the crushed waste concrete. It is also possible to install carbon dioxide gas concentration meters in the gas piping 21 that supplies the carbon dioxide-containing gas and in the safety valve 16 that releases it into the atmosphere, and determine the amount of immobilized carbon dioxide from the difference.

[0031] <Carbon dioxide supply equipment 20> The carbon dioxide supply equipment 20 supplies carbon dioxide-containing gas to the immobilization container 10. The carbon dioxide supply equipment 20 is, for example, a storage tank for storing carbon dioxide-containing gas, and supplies the carbon dioxide-containing gas to the immobilization container 10 through gas piping 21. The storage tank stores, for example, high-concentration carbon dioxide-containing gas recovered from factory exhaust gas or atmospheric air by any method (chemical method, cryogenic separation method, air separation method, etc.).

[0032] Unlike this embodiment, the carbon dioxide supply equipment 20 may be equipment within a factory that emits carbon dioxide-containing gas as exhaust gas. In this case, for example, exhaust gas emitted from a boiler or the like within the factory is supplied to the immobilization container 10 as low-concentration carbon dioxide-containing gas. Exhaust gas from heating or kitchens can also be used, as long as it contains carbon dioxide. The exhaust gas preferably contains 10 vol% or more of carbon dioxide, and more preferably contains 15 vol% or more of carbon dioxide.

[0033] <Steam supply equipment 30> The steam supply equipment 30 supplies steam to the stationary container 10. The carbon dioxide supply equipment 20 includes, for example, a boiler and a steam heater, and supplies steam to the stationary container 10 through steam piping 31.

[0034] <Carbon dioxide fixation process> In the carbon dioxide fixation system 1 configured as described above, carbon dioxide-containing gas and steam are supplied to the fixation container 10 from the carbon dioxide supply equipment 20 and the steam supply equipment 30, and carbon dioxide is fixed in the crushed waste concrete inside the fixation container 10.

[0035] Specifically, first, the first valve 13 and the second valve 14 are opened, and carbon dioxide-containing gas and water vapor are supplied into the immobilization container 10 containing the crushed waste concrete. Then, by switching the open / closed state of the second valve 14 to switch between supplying and not supplying water vapor, carbon dioxide-containing gas is continuously supplied into the immobilization container 10 for a certain period of time, thereby immobilizing carbon dioxide in the crushed waste concrete inside the immobilization container 10.

[0036] During the above period, the inside of the immobilization container 10 is maintained in the range of relative humidity 40 to 90% RH and temperature 60 to 150°C. In this embodiment, while monitoring the temperature and humidity inside the immobilization container 10 with a thermometer and hygrometer 15, if the humidity or temperature falls below a predetermined lower limit (for example, 40% RH, 60°C), the operator switches the second valve 14 from the closed state to the open state. This introduces high-temperature (for example, 150°C) water vapor into the immobilization container 10, maintaining the humidity and temperature inside the immobilization container 10 within the above range.

[0037] Since the technology for fixing carbon dioxide in waste concrete is a well-known technology, a detailed explanation will be omitted. Also, unlike this embodiment, the opening and closing control of the second valve 14 may be performed automatically by a computer.

[0038] The sequestering container 10, which contains crushed waste concrete with fixed carbon dioxide, is transported by vehicle to a recycling site for the crushed waste concrete.

[0039] <Effects of the immobilized container 10> In the immobilization container 10 of this embodiment, carbon dioxide-containing gas is supplied to the internal space sealed by the container body 11 and the lid 12. With this configuration, there is no escape route for the carbon dioxide-containing gas, making it easier for the gas to come into contact with the crushed waste concrete, thereby promoting carbon dioxide immobilization.

[0040] Furthermore, the immobilization container 10 of this embodiment contains crushed waste concrete of the same size. With this configuration, gaps are secured between the crushed waste concrete, which ensures a contact area between the crushed waste concrete and the carbon dioxide-containing gas, making it possible to immobilize more carbon dioxide in the crushed waste concrete. Also, since the size of the crushed waste concrete is the same, the time required to immobilize carbon dioxide in each piece of crushed waste concrete is the same, making it possible to efficiently immobilize carbon dioxide in multiple pieces of crushed waste concrete. Moreover, when reusing the crushed waste concrete from which carbon dioxide has been immobilized, it becomes possible to provide crushed waste concrete of the same size in bulk.

[0041] Unlike this embodiment, when crushed waste concrete of different sizes is contained in the immobilization container 10, vibrations and other factors generated during the transport of the immobilization container 10 eliminate the voids between the crushed waste concrete, reducing the amount of carbon dioxide immobilized in the crushed waste concrete.

[0042] <Flow of waste concrete recycling> Next, with reference to Figure 2, the process of reusing waste concrete using the carbon dioxide fixation method of this embodiment will be explained. Figure 2 is a diagram illustrating the process of reusing waste concrete.

[0043] Waste concrete is generated from demolished buildings and other structures at demolition sites (see Figure 2(a)). Waste concrete generated at demolition sites can be up to 1 meter in size and may contain reinforcing steel, so it is transported to a crushing plant by dump truck (see Figure 2(b)). At the crushing plant, the waste concrete is usually crushed to 40 mm or less (see Figure 2(c)). Here, for example, if the waste concrete is processed into recycled aggregate or recycled roadbed material, the crushed waste concrete with fixed carbon dioxide can be directly transported to the reuse site, as will be described later, and adjustments to particle size, etc. after carbon dioxide fixation are unnecessary. The crushed waste concrete is stored in yards according to size, for example (see Figure 2(d)).

[0044] The crushed waste concrete, stored according to size, is loaded into the fixed container 10 by a wheel loader (see Figure 2(e)). The fixed container 10, loaded with crushed waste concrete, is loaded onto a truck using a crane, forklift, arm roll, etc., and transported to the carbon dioxide-containing gas supply location (see Figure 2(f)). Alternatively, the crushed waste concrete may be loaded directly into the fixed container 10 from the crushing plant without being stored in a yard. Alternatively, the crushed waste concrete may be loaded into the fixed container 10 while the fixed container 10 is loaded onto a truck.

[0045] The immobilized container 10, transported by truck to the carbon dioxide-containing gas supply location, is unloaded from the truck and receives carbon dioxide-containing gas from the carbon dioxide supply equipment 20 (see Figure 2(g)). Alternatively, the immobilized container 10 may receive the carbon dioxide-containing gas while still loaded on the truck. Unloading the immobilized container 10 from the truck allows the truck to perform other transport tasks during that time, thus improving the truck's operational efficiency.

[0046] Once carbon dioxide is fixed in the crushed waste concrete inside the immobilization container 10, the immobilization container 10 is loaded onto a truck again and transported to a waste concrete recycling site (see Figure 2(h)). At the recycling site, such as a construction site, the crushed waste concrete is removed from the immobilization container 10 and reused (see Figure 2(i)). The reused crushed waste concrete can be used as recycled aggregate, recycled roadbed material, recycled crushed stone (backfill material, foundation material, etc.), fluidized soil, and cement mixture (admixture). The truck carrying the immobilization container 10 may be the same truck used to transport the container 10 from the crushing plant to the carbon dioxide-containing gas supply site, or it may be a different truck. With this configuration, it is possible to dispatch a truck that is convenient at the time, thus improving the efficiency of truck operation.

[0047] As described above, according to the carbon dioxide fixation method of this embodiment, carbon dioxide is fixed in the crushed waste concrete within the fixation container 10 for transporting the crushed waste concrete. Therefore, when fixing carbon dioxide in crushed waste concrete, there is no need to remove the crushed waste concrete from the fixation container 10 or to reload the crushed waste concrete with fixed carbon dioxide back into the fixation container 10. In other words, the workload for fixing carbon dioxide in waste concrete is reduced, and labor savings are achieved.

[0048] Furthermore, according to the carbon dioxide fixation method of this embodiment, since the carbon dioxide fixation process is carried out in a fixation container 10 that can be transported by truck, it does not require large-scale facilities or land equipped with a rotary kiln or the like, and it becomes possible to fix carbon dioxide in waste concrete in a relatively small space. Although carbon dioxide-containing gas may be supplied into the fixation container 10, carbon dioxide may also be fixed in the crushed waste concrete inside the fixation container 10 by placing the fixation container 10 in a carbon dioxide-containing gas. In this case, for example, it is sufficient to have a place to install one fixation container 10, such as widening a part of the flue or using another sealed building.

[0049] Waste concrete is generated throughout Japan, but constructing large-scale facilities in various locations across the country is not practical. Furthermore, transporting waste concrete to large-scale facilities far away and then to recycling sites would generate a large amount of carbon dioxide-containing gas during transport, which is undesirable. In contrast, the carbon dioxide fixation method of this embodiment allows the fixation container 10 to be installed anywhere, making it possible to handle the problem with a nearby small-scale factory (carbon dioxide supply facility), and also shortening the transport distance of the waste concrete.

[0050] In Figure 2(g), carbon dioxide-containing gas may be supplied to the immobilization container 10 containing the crushed waste concrete from a carbon dioxide supply facility within the crushing plant. Alternatively, carbon dioxide-containing gas may be supplied to the immobilization container 10 containing the crushed waste concrete from a carbon dioxide supply facility near the reuse site (construction site).

[0051] Furthermore, in Figure 2(h), the immobilization container 10 containing the crushed waste concrete from which carbon dioxide has been immobilized may not be directly transported to the waste concrete recycling site, but may be transported to a processing facility for adjusting the size of the crushed waste concrete. If the immobilization container 10 contains crushed waste concrete of the same size, the different sizes will be mixed at the processing facility and then transported to the recycling site by dump truck. On the other hand, if the immobilization container 10 contains crushed waste concrete of different sizes, the sizes will be standardized to the same size at the processing facility and then transported to the recycling site by dump truck.

[0052] Furthermore, in Figure 2(f), while the immobilization container 10 is being transported by truck to the carbon dioxide-containing gas supply location, the truck's exhaust gas may be supplied to the immobilization container 10, and the carbon dioxide in the exhaust gas may be immobilized in the crushed waste concrete inside the immobilization container 10. When supplying exhaust gas from a truck, the function of the safety valve 16 of the immobilization container 10 may be stopped, or a gap may be created between the container body 11 and the lid 12 to allow the exhaust gas to be released into the atmosphere.

[0053] <Local production and consumption of waste concrete> Finally, with reference to Figure 3, the local production and consumption of waste concrete realized by the carbon dioxide fixation method of this embodiment will be explained. Figure 3 is a diagram illustrating the local production and consumption of waste concrete.

[0054] Waste concrete generated at the demolition site is crushed at a crushing plant (local factory) located in the same area as the demolition site (see Figures 3(a) and 3(b)). The crushed waste concrete produced at the crushing plant in the same area is loaded into a fixed container 10 and transported to a carbon dioxide gas emitting plant in the same area (for example, a nearby waste incineration facility) (see Figure 3(c)).

[0055] Then, carbon dioxide-containing gas (exhaust gas, etc.) is supplied from the carbon dioxide supply equipment 20 at the carbon dioxide gas emitting plant located in the same area to the immobilization container 10, and the carbon dioxide is immobilized in the crushed waste concrete inside the immobilization container 10 (see Figure 3(d)). The crushed waste concrete, with the carbon dioxide immobilized, is transported to a construction site or other location in the same area while still contained in the immobilization container 10, and reused (see Figures 3(e) and 3(f)).

[0056] As described above, the carbon dioxide fixation method of this embodiment enables the local production and consumption of waste concrete.

[0057] The present invention is not limited to the embodiments described above, and can be modified in various ways within the scope of the claims.

[0058] For example, in the embodiment described above, the temperature and humidity inside the immobilization container 10 were adjusted while carbon dioxide was being immobilized in the waste concrete. However, the temperature and humidity inside the immobilization container 10 do not necessarily need to be adjusted. For example, only the humidity inside the immobilization container 10 may be adjusted from the viewpoint of controlling the amount of water adhering to the crushed waste concrete. Alternatively, neither the temperature nor the humidity may be adjusted.

[0059] Furthermore, in the embodiment described above, steam was supplied into the immobilization container 10 by the steam supply equipment 30. However, it is not always necessary to supply steam into the immobilization container 10. For example, if factory exhaust gas is supplied to the immobilization container 10 as a carbon dioxide-containing gas, and the factory exhaust gas contains moisture, it is not necessary to supply steam from the steam supply equipment 30. Alternatively, if the crushed waste concrete inside the immobilization container 10 is pre-watered to wet the surface of the crushed waste concrete, it is not necessary to supply steam from the steam supply equipment 30.

[0060] Furthermore, in the embodiment described above, the first and second valves 13 and 14 are provided on the side of the immobilization container 10. However, the first and second valves 13 and 14 may also be provided on the lid 12 of the immobilization container 10. Alternatively, the immobilization container 10 may not have valves, and may only have a supply port for supplying carbon dioxide-containing gas or water vapor.

[0061] Furthermore, in the embodiment described above, the fixed container 10 was transported by being loaded onto a vehicle such as a truck. However, the fixed container 10 does not necessarily have to be loaded onto a vehicle; for example, the fixed container 10 may be equipped with wheels and towed by a vehicle.

[0062] Furthermore, in the embodiment described above, carbon dioxide-containing gas or water vapor was supplied to the immobilization container 10, which consists of a container body 11 and a lid 12. However, the immobilization container 10 does not necessarily have to be provided with a lid 12. In this case, for example, waste concrete can be placed in an immobilization container 10 with an open top consisting only of a container body 11, water can be sprinkled on the waste concrete, and then the immobilization container 10 can be left for a certain period of time in a carbon dioxide-containing gas atmosphere such as a flue or gas house to immobilize carbon dioxide in the waste concrete.

[0063] Furthermore, the above-described embodiment explained the case of fixing carbon dioxide in waste concrete as an example. However, the cementitious hardened body on which carbon dioxide is fixed is not limited to waste concrete, but may also be, for example, concrete sludge or solid matter obtained by dewatering sludge generated from a concrete manufacturing plant (dewatered cake of concrete sludge). [Explanation of symbols]

[0064] 1. Carbon dioxide sequestration system, 10 immobilization container, 11 Container body, 12 Lid, 13, 14 valves, 15 Thermohygrometer, 16 Safety valve, 20. Carbon dioxide supply facilities, 21 Gas piping, 30. Steam supply equipment, 31. Steam piping.

Claims

1. (a) A step of placing the cementitious hardened body into a carbon dioxide fixation container, (b) A step of transporting the fixed container containing the cementitious hardened body by vehicle to a location for supplying carbon dioxide-containing gas, (c) A step in which carbon dioxide-containing gas is supplied to the immobilization container containing the cementitious hardened body at the carbon dioxide-containing gas supply location, thereby immobilizing carbon dioxide in the cementitious hardened body within the immobilization container, (d) A step of transporting the immobilization container containing the cementitious hardened body in which the carbon dioxide has been immobilized from the carbon dioxide-containing gas supply location to another location by vehicle, A robust method for carbon dioxide fixation.

2. The aforementioned fixed container consists of a container body that contains the cementitious hardened body and a lid that covers the container body. The container body or the lid is provided with a first supply port for supplying carbon dioxide-containing gas to the space defined by the container body and the lid. The carbon dioxide fixation method according to claim 1, wherein in step (c), a carbon dioxide-containing gas is supplied to the space from the first supply port.

3. The container body or the lid is further provided with a second supply port for supplying steam to the space. The carbon dioxide fixation method according to claim 2, wherein in step (c), water vapor is further supplied to the space from the second supply port.

4. The aforementioned fixed container is equipped with a hygrometer for detecting the humidity of the space, The carbon dioxide fixation method according to claim 3, wherein in step (c), the amount of water vapor supplied is adjusted based on the humidity of the space.

5. The aforementioned fixed container is equipped with a thermometer for detecting the temperature of the space, The carbon dioxide fixation method according to claim 4, wherein in step (c), the amount of water vapor supplied is adjusted based on the temperature of the space.

6. The carbon dioxide fixation method according to any one of claims 2 to 5, wherein the container body or the lid is provided with a safety valve for maintaining the pressure in the space below a predetermined pressure.

7. The carbon dioxide fixation method according to any one of claims 1 to 5, wherein in step (a), the cementitious hardened bodies of the same size are housed in the fixation container.

8. The carbon dioxide fixation method according to any one of claims 1 to 5, wherein the other location is a location where the cementitious hardened body is used.

9. The carbon dioxide fixation method according to claim 8, wherein the location where the cementitious hardened body is used and the location where the carbon dioxide-containing gas is supplied are located within the same area.

10. The carbon dioxide fixation method according to any one of claims 1 to 5, wherein in step (b), the exhaust gas of the vehicle is supplied to the fixation container.

11. The carbon dioxide fixation method according to any one of claims 1 to 5, wherein the cementitious hardened body includes a dewatered cake of waste concrete or concrete sludge.

12. A carbon dioxide fixation container that can be transported by vehicle, A container body for containing the cementitious hardened material, It has a lid that covers the main body of the container, A carbon dioxide fixation container, wherein the container body or the lid is provided with a supply port for supplying carbon dioxide-containing gas to the space defined by the container body and the lid.

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