Carbon dioxide fixation device

Abstract

To provide a device of fixing carbon dioxide gas, capable of reducing the amount of carbon dioxide gas discharged from a construction site and efficiently disposing of unused ready-mixed concrete.SOLUTION: A device 1 of fixing carbon dioxide gas according to an embodiment of the present invention, comprises a storage 2 storing water W, a cylindrical unit 3 disposed in the storage 2 to receive unused ready-mixed concrete C being fed thereinto, a rotary driver 4 rotating the cylindrical unit 3 on a shaft 4b extending in an axial direction D, i.e., in the direction along which an axial line L of the cylindrical unit 3 extends, and a carbon dioxide introduction unit 5 introducing carbon dioxide gas G into the storage 2. The cylindrical unit 3 is a mesh-like body with a plurality of through holes 3b formed thereon to connect the inside and the outside of the cylindrical unit 3. The carbon dioxide introduction unit 5 introduces the carbon dioxide gas G into the cylindrical unit 3 that stores the ready-mixed concrete C and is rotated by the rotary driver 4.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a carbon dioxide fixation device that fixes carbon dioxide in unused ready-mixed concrete. [Background technology]

[0002] Japanese Patent Application Laid-Open Publication No. 2005-289783 describes an aggregate separation device that separates aggregate from ready-mixed concrete and reuses the separated aggregate. The aggregate separation device includes a base, a drum support stand erected on the base, two drum holding rollers rotatably mounted on the drum support stand, and a rotating drum held by each drum holding roller.

[0003] The rotating drum has a pair of conical cylinders and a cylindrical body connecting the pair of conical cylinders. One of the pair of conical cylinders has an opening for feeding fresh concrete and for discharging aggregate mixture remaining in the rotating drum. An external heating device is attached to the other of the pair of conical cylinders.

[0004] Several iron blocks are placed in the rotating drum at the same time as the ready-mixed concrete. These iron blocks act as anti-agglomeration agents to prevent the ready-mixed concrete from agglomerating as it rotates inside the drum. As the ready-mixed concrete is placed in the rotating drum, it is agitated and dried by high-temperature gas injected into the drum, turning it into a mixture of aggregate.

[0005] After drying, the mixture is discharged from the rotary drum and fed into a vibratory separator. The vibratory separator vibrates and sifts the mixture, separating it into coarse aggregate, fine aggregate, and fine particles. Each of the separated coarse aggregate, fine aggregate, and fine particles is reused. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-289783 Summary of the Invention [Problem to be solved by the invention]

[0007] However, when cement is manufactured, a large amount of carbon dioxide (CO2) can be emitted, and when that cement is used to build a concrete structure, the problem of increased carbon dioxide emissions from the construction site can arise. There is also a need for a more efficient way to reduce unused ready-mixed concrete. Therefore, there is a need for a way to reduce carbon dioxide and efficiently process unused ready-mixed concrete.

[0008] The present disclosure aims to provide a carbon dioxide fixation device that can reduce the amount of carbon dioxide emitted from a work site and efficiently process unused ready-mixed concrete. [Means for solving the problem]

[0009] The carbon dioxide fixation device according to the present disclosure comprises a storage section for storing water, a cylindrical section provided inside the storage section and into which unused ready-mixed concrete is poured, a rotation drive section for rotating the cylindrical section around a shaft extending in the axial direction of the cylindrical section, and a carbon dioxide gas introduction section for introducing carbon dioxide gas into the storage section. The cylindrical section is in a mesh shape with a plurality of through holes that communicate between the inside and outside of the cylindrical section, and the carbon dioxide gas introduction section introduces carbon dioxide gas into the cylindrical section, which stores ready-mixed concrete and is rotated by the rotation drive section.

[0010] In this carbon dioxide fixation device, water is stored in a storage section, and unused ready-mixed concrete is poured into a cylindrical section located inside the storage section. The cylindrical section is mesh-like, and the cylindrical section containing the ready-mixed concrete is rotated by a rotary drive unit. This rotation leaves the aggregate of the ready-mixed concrete inside the cylindrical section and sifts out the cement sludge from the cylindrical body, allowing the aggregate and cement sludge to be separated. This carbon dioxide fixation device includes a carbon dioxide gas inlet section that introduces carbon dioxide gas into the storage section, and the carbon dioxide gas inlet section introduces carbon dioxide gas into the cylindrical section rotated by the rotary drive unit. Thus, by supplying carbon dioxide gas to the ready-mixed concrete stored inside the rotating cylindrical section, the carbon dioxide gas is supplied to the rotating ready-mixed concrete, allowing the carbon dioxide gas to be efficiently fixed in the ready-mixed concrete. This allows for efficient processing of unused ready-mixed concrete. Furthermore, by efficiently fixing carbon dioxide gas in the ready-mixed concrete, carbon dioxide emissions from the site can be reduced.

[0011] The cylindrical portion may include an inner pipe and an outer pipe, and the plurality of through holes may include a plurality of first through holes that communicate the inside and outside of the inner pipe and a plurality of second through holes that communicate the inside and outside of the outer pipe. In this case, it is possible to leave coarse aggregate inside the inner pipe, leave aggregate such as fine aggregate that is finer than the coarse aggregate between the inner pipe and the outer pipe, and sift out cement sludge. Furthermore, when the rotary drive unit rotates the inner pipe and the outer pipe, it is possible to more efficiently separate the aggregate in the ready-mixed concrete.

[0012] The rotary drive unit may separate the ready-mixed concrete into cement sludge and aggregate by rotating the cylindrical unit into which the ready-mixed concrete has been poured, leaving the aggregate of the ready-mixed concrete inside the cylindrical unit and discharging the cement sludge of the ready-mixed concrete from the cylindrical unit. The carbon dioxide gas introduction unit may introduce carbon dioxide gas into the cement sludge separated from the aggregate. In this case, since carbon dioxide gas is introduced into the separated cement sludge, the fixation of the carbon dioxide gas can be performed more efficiently.

[0013] The carbon dioxide fixation device may be equipped with a set retarder injection means for injecting a set retarder into the container. In this case, the set retarder is injected into the unused ready-mixed concrete, making it easier for the ready-mixed concrete to react with carbon dioxide. As a result, carbon dioxide emissions at the work site can be further reduced.

[0014] The carbon dioxide fixation device may include an extraction part that extracts from the storage part a precipitate containing calcium carbonate produced by introducing carbon dioxide into the cement sludge. In this case, the precipitate obtained by immobilizing carbon dioxide in the cement sludge can be extracted from the extraction part.

[0015] The carbon dioxide fixation device may be equipped with a measurement unit that measures the amount of carbon dioxide fixed in the ready-mixed concrete from at least one of the pH inside the storage unit and the concentration of carbon dioxide inside the storage unit. In this case, the amount of carbon dioxide fixed in the ready-mixed concrete is measured by the measurement unit, so the amount of carbon dioxide reduced can be determined by the measurement by the measurement unit.

[0016] The carbon dioxide fixation device may include a tilting device that tilts the storage section to discharge the aggregate remaining inside the cylindrical section from the cylindrical section. In this case, the tilting device tilts the storage section, making it possible to easily discharge the aggregate remaining inside the cylindrical section.

[0017] The carbon dioxide fixation device may include a traveling body that is equipped with a storage unit, a cylindrical unit, a rotation drive unit, and a carbon dioxide gas introduction unit. In this case, the storage unit, the cylindrical unit, the rotation drive unit, and the carbon dioxide gas introduction unit are mounted on the traveling body, so that the ready-mixed concrete can be treated while being moved within a work site or between multiple work sites by the traveling body. Therefore, the treatment of ready-mixed concrete and the fixation of carbon dioxide gas in the ready-mixed concrete can be performed more efficiently.

[0018] The carbon dioxide fixation device may be provided with a pipeline for supplying exhaust gas generated by the driving of the traveling body to the carbon dioxide gas introduction part, and the carbon dioxide gas introduction part may introduce the exhaust gas together with carbon dioxide into the storage part. In this case, the exhaust gas generated by the driving of the traveling body can be effectively used for fixing carbon dioxide gas in the ready-mixed concrete. [Effects of the Invention]

[0019] According to the present disclosure, it is possible to reduce the amount of carbon dioxide emitted from the site and efficiently process unused ready-mixed concrete. [Brief explanation of the drawings]

[0020] [Figure 1] 1(a) is a side view showing the carbon dioxide gas fixation device according to the first embodiment, and FIG. 1(b) is a side view showing a state in which the storage section of the carbon dioxide gas fixation device according to the first embodiment is tilted by a tilting device. [Figure 2] FIG. 10 is a perspective view showing an input section of a carbon dioxide gas fixation device according to a modified example. [Figure 3] 3(a) is a cross-sectional view schematically showing the cylindrical part and the storage part of the carbon dioxide gas fixation device according to the embodiment, and FIG. 3(b) is a cross-sectional view taken along line AA in FIG. 3(a). [Figure 4] FIG. 2 is a perspective view showing a solid-liquid separator of the carbon dioxide gas fixation apparatus according to the first embodiment. [Figure 5] FIG. 10 is a side view schematically showing a carbon dioxide gas fixation device according to a second embodiment. [Figure 6] 6(a) is a side view showing the cylindrical part of the carbon dioxide gas fixation device according to the second embodiment, and FIG. 6(b) is a side view schematically showing a state in which aggregate is being discharged from the cylindrical part of FIG. 6(a). [Figure 7] FIG. 10 is a perspective view showing a carbon dioxide gas fixation device according to a third embodiment. [Figure 8] 10(a), (b), and (c) are perspective views showing a cylindrical portion according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment of a carbon dioxide gas fixation device according to the present disclosure will be described with reference to the drawings. In the description of the drawings, identical or corresponding elements are designated by the same reference numerals, and duplicate explanations will be omitted as appropriate. The drawings may be partially simplified or exaggerated for ease of understanding, and the dimensional proportions and the like are not limited to those shown in the drawings.

[0022] (First embodiment) Fig. 1(a) is a side view showing a carbon dioxide fixation device 1 according to a first embodiment. The carbon dioxide fixation device 1 is installed, for example, at a construction site A (site). The carbon dioxide fixation device 1 processes, for example, unused ready-mixed concrete C generated at the construction site A inside the construction site A. The carbon dioxide fixation device 1 prevents, for example, returned concrete (ready-mixed concrete that has been ordered but is returned without being unloaded from the ready-mixed concrete truck) from being generated at the construction site A.

[0023] The carbon dioxide fixation device 1 neutralizes (carbonates) muddy water or concrete wash water with carbon dioxide, for example. The carbon dioxide fixation device 1 includes a storage section 2 that stores water W, a cylindrical section 3 that is located inside the storage section 2 and stores ready-mixed concrete C, a rotation drive section 4 that rotates the cylindrical section 3, a carbon dioxide gas introduction section 5 that introduces carbon dioxide gas G into the storage section 2, and a traveling body 10 that carries the storage section 2, the cylindrical section 3, the rotation drive section 4, and the carbon dioxide gas introduction section 5.

[0024] In the carbon dioxide fixation device 1, ready-mixed concrete C is contained in a cylindrical portion 3, and as the cylindrical portion 3 rotates inside a storage portion 2 containing water W, coarse aggregate C1 and cement sludge C2 are separated from the ready-mixed concrete C, and carbon dioxide G is immobilized in the cement sludge C2 by introducing carbon dioxide G into the storage portion 2 through a carbon dioxide gas introducing portion 5. The carbon dioxide fixation device 1 is, for example, a batch-type device that performs the above separation and fixation of carbon dioxide G on a certain amount of ready-mixed concrete C.

[0025] The storage unit 2 has, for example, an openable and closable lid 2b. With the lid 2b open, water can be poured into the storage unit 2. For example, the carbon dioxide fixation device 1 has a covering member 6 that opens and closes the storage unit 2 and the rotary drive unit 4. For example, the covering member 6 covers the storage unit 2 and the rotary drive unit 4 when the rotary drive unit 4 is operating. This reduces noise from the storage unit 2 and the rotary drive unit 4 and prevents the carbon dioxide G supplied to the storage unit 2 from leaking, thereby facilitating the fixation of the carbon dioxide G in the ready-mixed concrete C.

[0026] The storage section 2 is, for example, box-shaped. The storage section 2 houses a cylindrical section 3, which rotates inside the storage section 2 by being driven by a rotation drive section 4. The cylindrical section 3 rotates while housing ready-mixed concrete C, thereby washing the coarse aggregate C1 of the ready-mixed concrete C with water W. The carbon dioxide fixation device 1 includes, for example, a water injection means 7 that injects water W into the storage section 2, and a setting retarder injection means 8 that injects a setting retarder K into the storage section 2.

[0027] As an example, the water injection means 7 injects water W in an amount between 5 times and 5000 times the amount of ready-mixed concrete C contained inside the cylindrical portion 3. The water injection means 7 may also inject water W in an amount 10 times or more, 50 times or more, or 100 times or more the amount of ready-mixed concrete C, or may inject water W in an amount 1000 times or less.

[0028] The set retarder K injected by the set retarder injection means 8 is, for example, a super retarder. The pH of the ready-mixed concrete C is lowered by injecting water W into the ready-mixed concrete C, and the setting speed of the ready-mixed concrete C is adjusted (slowed down) by injecting set retarder K into the ready-mixed concrete C. The ready-mixed concrete C contained in the cylindrical portion 3 is stirred, for example, together with water W and set retarder K inside the cylindrical portion 3.

[0029] The rotation drive unit 4 has a shaft 4b extending along an axial direction D, which is the direction in which the axis L of the cylindrical portion 3 extends, and a motor 4c provided at the end of the shaft 4b and outside the storage unit 2. The rotation drive unit 4 rotates the cylindrical portion 3 around the shaft 4b by the driving force of the motor 4c. The shaft 4b extends, for example, along the axis L of the cylindrical portion 3. The motor 4c is provided outside the storage unit 2 on the loading platform 11 of the traveling body 10.

[0030] The cylindrical portion 3 extends in the front-to-rear direction of the traveling body 10. Unused ready-mixed concrete C is poured into the cylindrical portion 3. The cylindrical portion 3 is in a mesh shape with a plurality of through holes 3b that connect the inside and outside of the cylindrical portion 3. Therefore, when the cylindrical portion 3 into which the ready-mixed concrete C has been poured rotates, the coarse aggregate C1 of the ready-mixed concrete C remains inside the cylindrical portion 3, and the cement sludge C2 of the ready-mixed concrete C is sieved out to the outside of the cylindrical portion 3. The cement sludge C2 is in a slurry state.

[0031] For example, at least a portion of the carbon dioxide gas introduction section 5 is provided outside the storage section 2 on the loading platform 11. The carbon dioxide gas introduction section 5 supplies carbon dioxide gas G to the ready-mixed concrete C to neutralize the ready-mixed concrete C. A portion of the carbon dioxide gas G that the carbon dioxide gas introduction section 5 supplies to the ready-mixed concrete C contains carbon dioxide gas (exhaust gas, etc.) emitted at the construction site A. For example, the carbon dioxide gas introduction section 5 has a pipe 5b that passes through the inside of the storage section 2, and a portion of the pipe 5b protrudes into the inside of the storage section 2. The carbon dioxide gas introduction section 5 supplies carbon dioxide gas G into the inside of the storage section 2 via the pipe 5b.

[0032] The carbon dioxide gas introduction unit 5 has, for example, a carbon dioxide gas cylinder 5c, and introduces carbon dioxide gas G from the carbon dioxide gas cylinder 5c through a pipe 5b into the inside of the storage unit 2. As an example, the carbon dioxide gas introduction unit 5 supplies carbon dioxide gas G into the inside of the storage unit 2 by pressurizing it. Alternatively, the carbon dioxide gas introduction unit 5 may supply carbon dioxide gas G from a DAC device, which is a carbon dioxide recovery device, into the inside of the storage unit 2. In this case, the carbon dioxide gas G can be supplied into the storage unit 2 by the carbon dioxide gas introduction unit 5 from the DAC device that directly absorbs carbon dioxide (carbon dioxide gas) from the atmosphere, and the carbon dioxide stored in the DAC device can be effectively utilized.

[0033] The carbon dioxide gas introduction section 5 may supply the exhaust gas generated by the operation of the traveling body 10 as carbon dioxide gas G into the inside of the storage section 2. In this case, the exhaust gas from the traveling body 10 can be effectively used for fixing the carbon dioxide gas in the ready-mixed concrete C. The carbon dioxide gas introduction section 5 may also supply the carbon dioxide gas G discharged from at least one of a ready-mixed concrete truck, a pump truck, and mechanical equipment arranged at the construction site A into the inside of the storage section 2. The mechanical equipment arranged at the construction site A is, for example, a generator, construction machinery, or heavy machinery. In this case, the exhaust gas from the mechanical equipment, etc. arranged at the construction site A can be effectively used for fixing the carbon dioxide gas in the ready-mixed concrete C.

[0034] The carbon dioxide gas introducing section 5 introduces carbon dioxide gas G, for example, as bubbles into the water W inside the storage section 2. In this case, it is possible to efficiently supply carbon dioxide gas G to the cement sludge C2 separated from the ready-mixed concrete C. As an example, the carbon dioxide gas introducing section 5 introduces carbon dioxide gas G as microbubbles.

[0035] The traveling body 10 includes, for example, a loading platform 11 and a traveling device 12 provided below the loading platform 11. For example, the storage section 2, the cylindrical section 3, the rotation drive section 4, the carbon dioxide gas introduction section 5, and the covering member 6 are mounted on the loading platform 11. The traveling device 12 includes a vehicle body 12b and a plurality of wheels 12c located below the vehicle body 12b.

[0036] As an example, the vehicle body 12b has an internal combustion engine 12d, a radiator 12f, and a pipe 12g extending from the internal combustion engine 12d to the pipe 5b of the carbon dioxide gas introduction unit 5. Exhaust gas is generated from the internal combustion engine 12d, and for example, the exhaust gas from the internal combustion engine 12d is supplied to the pipe 5b of the carbon dioxide gas introduction unit 5 via the pipe 12g. In this case, the carbon dioxide gas introduction unit 5 introduces carbon dioxide gas G into the interior of the storage unit 2 together with the exhaust gas from the internal combustion engine 12d, so that the exhaust gas from the internal combustion engine 12d can be effectively used to fix the carbon dioxide gas in the ready-mixed concrete C. Furthermore, the pipe 12g may be directly connected to the bottom surface of the storage unit 2. In this case, it is possible to introduce the exhaust gas from the internal combustion engine 12d directly into the interior of the storage unit 2.

[0037] As shown in FIG. 1(b), the carbon dioxide fixation device 1 includes a tilting device 9 that tilts the storage section 2 to discharge the coarse aggregate C1 (aggregate) remaining inside the cylindrical section 3 from the cylindrical section 3. Note that FIG. 1(b) shows some parts, such as the storage section 2, in a simplified manner. The tilting device 9 has, for example, a dump-up mechanism for a traveling body 10. The tilting device 9 tilts the loading platform 11 so that the rear side of the loading platform 11 faces downward by pushing up the front part of the loading platform 11 using the rear part of the loading platform 11 as a fulcrum. This allows the coarse aggregate C1 and cement sludge C2 remaining inside the storage section 2 to be discharged from the storage section 2.

[0038] The traveling body 10 is equipped with an extraction unit 13 that discharges the cement sludge C2 from the storage unit 2. The extraction unit 13 is, for example, a pipe that extends downward and diagonally rearward from the bottom surface of the storage unit 2. The extraction unit 13 makes it possible to discharge only the separated cement sludge C2 from the storage unit 2.

[0039] Fig. 2 is a perspective view showing a traveling body 10A according to a modified example. Note that Fig. 2 shows some parts, such as the storage section 2, in a simplified form. As shown in Fig. 2, the traveling body 10A includes a crane device 14 located between the storage section 2 and the cabin 10b of the traveling body 10A, and a hopper 15 suspended by the crane device 14. Unused ready-mixed concrete C is poured into the hopper 15 from a ready-mixed concrete truck at the construction site A.

[0040] Then, the hopper 15 into which the ready-mixed concrete C has been charged is lifted by the crane device 14, and the ready-mixed concrete C is charged from the hopper 15 into the cylindrical portion 3 inside the storage section 2. However, the means for charging the ready-mixed concrete C into the cylindrical portion 3 is not limited to the crane device 14 and the hopper 15, and can be changed as appropriate. For example, the ready-mixed concrete C may be charged into the cylindrical portion 3 directly from a pump truck at the construction site A.

[0041] Next, an example of the structure of the cylindrical portion 3 will be described in more detail. Fig. 3(a) is a side cross-sectional view schematically showing the storage portion 2 and the cylindrical portion 3. Fig. 3(b) is a cross-sectional view taken along line AA in Fig. 3(a). As shown in Figs. 3(a) and 3(b), the cylindrical portion 3 has, for example, a double-tube structure. In this case, the cylindrical portion 3 includes a mesh-like inner tube 3A and a mesh-like outer tube 3B that houses the inner tube 3A.

[0042] The multiple through holes 3b of the cylindrical portion 3 include multiple first through holes 3c formed in the inner pipe 3A and multiple second through holes 3d formed in the outer pipe 3B. For example, the second through holes 3d are smaller (finer) than the first through holes 3c. In this case, it is possible to capture relatively coarse particles (e.g., fine aggregate) of the ready-mixed concrete C between the inner pipe 3A and the outer pipe 3B, while relatively fine particles (e.g., sand) can be discharged outside the outer pipe 3B.

[0043] For example, the rotation drive unit 4 has two shafts 4b and two motors 4c. One of the two shafts 4b and one of the two motors 4c rotates, for example, the inner tube 3A. The other of the two shafts 4b and the other of the two motors 4c rotates the outer tube 3B.

[0044] For example, one of the two motors 4c is arranged on one side of the axial direction D of the storage unit 2, and the other of the two motors 4c is arranged on the other side of the axial direction D of the storage unit 2. As an example, the rotation direction of the inner pipe 3A is opposite to the rotation direction of the outer pipe 3B. In this case, the ready-mixed concrete C in the water W can be stirred more efficiently and the coarse aggregate C1 can be washed. For example, the carbon dioxide gas introducing unit 5 introduces carbon dioxide gas G into the water W outside the outer pipe 3B inside the storage unit 2. This allows the carbon dioxide gas G to be immobilized more efficiently in the cement sludge C2 separated from the ready-mixed concrete C.

[0045] The cement sludge C2 separated from the ready-mixed concrete C and having the carbon dioxide G immobilized therein is, for example, discharged to the outside of the storage unit 2 via the extraction unit 13 and subjected to solid-liquid separation by a solid-liquid separator. Fig. 4 is a perspective view showing an example of a solid-liquid separator 20. For example, the solid-liquid separator 20 includes a collector 21 that collects the cement sludge C2 and a filter 22 that filters the cement sludge C2 collected by the collector 21.

[0046] For example, the collection device 21 has a suction section 21b that sucks up the cement sludge C2, a suction tube 21c extending from the suction section 21b, a main body section 21d connected to the opposite side of the suction tube 21c from the suction section 21b, and a drainage tube 21f extending from the main body section 21d to the filter device 22.

[0047] The filter device 22 includes, for example, a main body 22b to which a drainage tube 21f is connected, a filter press 22c that filters the cement sludge C2, a tank 22d that stores the water obtained by filtration by the filter press 22c, and a water supply tube 22f that extends from the tank 22d to the collection device 21. The filter press 22c and the tank 22d are, for example, built into the main body 22b.

[0048] Cement sludge C2 sucked by suction section 21b of collection device 21 is supplied to filter device 22 through suction tube 21c, main body 21d and drainage tube 21f, and is filtered by filter press 22c of filter device 22. Filtration by filter press 22c separates cement sludge C2 into a flocculate and water, and the flocculate is removed from filter device 22 after being flocculated in filter press 22c.

[0049] The aggregates removed from the filter device 22 are dried in the sun, for example. Alternatively, the aggregates may be dried while placed on porous concrete. Porous plates or pumice may be used instead of the porous concrete. The dried aggregates become, for example, surplus soil (general surplus soil, for example), and can be used as fill soil or concrete material. Meanwhile, the water separated from the cement sludge C2 is stored in the tank 22d and is supplied to the collection device 21, for example, via a water supply tube 22f.

[0050] Next, the effects obtained from the carbon dioxide fixation apparatus 1 according to this embodiment will be described in detail. As shown in Figures 1(a), 3(a), and 3(b), in the carbon dioxide fixation apparatus 1, water W is stored in the storage section 2, and unused ready-mixed concrete C is charged into a cylindrical section 3 provided inside the storage section 2. The cylindrical section 3 is mesh-like, and the cylindrical section 3 storing the ready-mixed concrete C is rotated by the drive of a rotation drive section 4. This rotation leaves aggregates such as coarse aggregate C1 of the ready-mixed concrete C inside the cylindrical section 3, while cement sludge C2 of the ready-mixed concrete C is sieved out from the cylindrical section 3, allowing the aggregate and cement sludge C2 to be separated.

[0051] The carbon dioxide fixation device 1 is equipped with a carbon dioxide gas introduction section 5 that introduces carbon dioxide gas G into the storage section 2, and the carbon dioxide gas introduction section 5 introduces carbon dioxide gas G into the cylindrical section 3 that is rotated by the rotation drive section 4. Therefore, by supplying carbon dioxide gas G to the ready-mixed concrete C contained inside the rotating cylindrical section 3, the carbon dioxide gas G is supplied to the rotating ready-mixed concrete C, and the carbon dioxide gas G can be efficiently fixed in the ready-mixed concrete C. Therefore, unused ready-mixed concrete C can be efficiently processed. Furthermore, by efficiently fixing carbon dioxide gas G in the ready-mixed concrete C, the amount of carbon dioxide gas G emitted from the construction site A can be reduced.

[0052] In this embodiment, the cylindrical portion 3 includes an inner pipe 3A and an outer pipe 3B, and the multiple through holes 3b include multiple first through holes 3c that communicate the inside and outside of the inner pipe 3A and multiple second through holes 3d that communicate the inside and outside of the outer pipe 3B. In this case, it is possible to leave coarse aggregate C1 inside the inner pipe 3A, leave aggregate such as fine aggregate finer than the coarse aggregate C1 between the inner pipe 3A and the outer pipe 3B, and sift out cement sludge C2. Furthermore, when the rotation drive unit 4 rotates the inner pipe 3A and the outer pipe 3B, the separation of the aggregate in the ready-mixed concrete C can be performed more efficiently.

[0053] In this embodiment, the rotary drive unit 4 rotates the cylindrical portion 3 into which the ready-mixed concrete C has been charged, leaving the aggregate of the ready-mixed concrete C inside the cylindrical portion 3 while discharging the cement sludge C2 of the ready-mixed concrete C from the cylindrical portion 3, thereby separating the ready-mixed concrete C into the cement sludge C2 and the aggregate. The carbon dioxide gas introducing unit 5 introduces carbon dioxide gas G into the cement sludge C2 separated from the aggregate. Therefore, since carbon dioxide gas G is introduced into the separated cement sludge C2, the fixation of the carbon dioxide gas G can be performed more efficiently.

[0054] In this embodiment, carbon dioxide G can be immobilized efficiently in the cement sludge C2 by introducing the carbon dioxide G as bubbles. The carbon dioxide gas inlet 5 may introduce carbon dioxide G into the water W inside the storage unit 2 as bubbles having a diameter on the order of nanobubbles to microbubbles. As described above, when carbon dioxide G is introduced as bubbles, the carbon dioxide G can be immobilized efficiently in the cement sludge C2. However, if the carbon dioxide G bubbles are nanobubbles, clogging may occur. In contrast, if the carbon dioxide G is in the form of microbubbles, clogging can be suppressed and the carbon dioxide G can be introduced more efficiently.

[0055] In this embodiment, the carbon dioxide fixation device 1 is equipped with a set retarder injection means 8 that injects a set retarder K into the storage section 2. Thus, the set retarder K is injected into the unused ready-mixed concrete C, which makes it easier for the ready-mixed concrete C to react with carbon dioxide G. As a result, the amount of carbon dioxide G emitted at the construction site A can be further reduced.

[0056] In this embodiment, the carbon dioxide fixation apparatus 1 includes an extraction unit 13 that extracts a precipitate containing calcium carbonate produced by introducing carbon dioxide G into the cement sludge C2 from the storage unit 2. In this case, the precipitate obtained by immobilizing carbon dioxide G in the cement sludge C2 can be extracted from the extraction unit 13.

[0057] In this embodiment, the carbon dioxide fixation device 1 includes a tilting device 9 that tilts the storage section 2 to discharge the aggregate remaining inside the cylindrical section 3 from the cylindrical section 3. Therefore, by tilting the storage section 2 with the tilting device 9, the aggregate remaining inside the cylindrical section 3 can be easily discharged.

[0058] In this embodiment, the carbon dioxide fixation device 1 includes a traveling body 10 that is equipped with a storage section 2, a cylindrical section 3, a rotary drive section 4, and a carbon dioxide gas introduction section 5. Therefore, since the storage section 2, the cylindrical section 3, the rotary drive section 4, and the carbon dioxide gas introduction section 5 are mounted on the traveling body 10, the ready-mixed concrete C can be treated while traveling within the construction site A or between multiple construction sites by the traveling body 10. Therefore, the treatment of the ready-mixed concrete C and the fixation of carbon dioxide gas G in the ready-mixed concrete C can be performed more efficiently.

[0059] In this embodiment, the carbon dioxide fixation device 1 may include a pipe 12g that supplies exhaust gas generated by the operation of the traveling body 10 to the carbon dioxide introduction part 5, and the carbon dioxide introduction part 5 introduces this exhaust gas together with carbon dioxide G into the storage part 2. In this case, the exhaust gas generated by the operation of the traveling body 10 can be effectively used for fixation of carbon dioxide G in the ready-mixed concrete C.

[0060] (Second embodiment) Next, a carbon dioxide gas fixation apparatus 31 according to a second embodiment will be described with reference to Fig. 5, Fig. 6(a), and Fig. 6(b). Part of the configuration of the carbon dioxide gas fixation apparatus 31 is the same as part of the configuration of the carbon dioxide gas fixation apparatus 1 described above. Therefore, the same reference numerals will be used to designate parts of the carbon dioxide gas fixation apparatus 31 that overlap with the configuration of the carbon dioxide gas fixation apparatus 1, and the description will be omitted as appropriate.

[0061] 5, 6(a), and 6(b), the carbon dioxide fixation device 31 is a stationary carbon dioxide fixation device that does not have a traveling body. The carbon dioxide fixation device 31 has a storage section 32 that stores water W, a cylindrical section 33 that is stored inside the storage section 32, and a carbon dioxide gas introduction section 35 that introduces carbon dioxide gas G into the storage section 32.

[0062] At least a portion of the carbon dioxide gas G introduced into the storage section 32 by the carbon dioxide gas introduction section 35 includes carbon dioxide gas G (exhaust gas, etc.) emitted at the construction site A. Furthermore, the carbon dioxide gas fixation device 31 has a pipe 31b that supplies water from the water injection means 7 to the inside of the storage section 2, and the pipe 31b, for example, penetrates the wall of the storage section 32.

[0063] The height of the water surface W1 of the water W in the storage section 32 is, for example, higher than the lower end of the cylindrical section 33 and lower than the lower end of the shaft section 4b. In this case, the coarse aggregate C1 can be washed with the water W inside the cylindrical section 33, and the intrusion of water into the shaft section 4b can be suppressed. However, the height of the water surface W1 inside the storage section 32 is not particularly limited.

[0064] The carbon dioxide fixation device 31 includes an agitator 36 that agitates the water W inside the storage section 32. For example, multiple agitators 36 are arranged inside the storage section 32. This promotes the agitation of the ready-mixed concrete C, carbon dioxide G, and water W. As an example, the storage section 32 has a rectangular shape in a plan view, and the multiple agitators 36 are arranged so as to line up on diagonals of the storage section 32 in a plan view.

[0065] The storage section 32 has a lid 32b, which can be opened and closed by the lid 32b. Closing the lid 32b prevents leakage of carbon dioxide gas G from the storage section 32. The cylindrical section 33, like the cylindrical section 3, has a mesh shape with a plurality of through holes 3b. The size of the through holes 3b (the length of one side when the through holes 3b are square) is, for example, 5 mm. The cylindrical section 33 is lifted from the storage section 32 with the lid 32b open.

[0066] For example, the cylindrical portion 33 has a pair of wires 33b extending from one end and the other end of the cylindrical portion 33 in the axial direction D. In this case, the pair of wires 33b are lifted by a lifting machine such as a crane, so that the cylindrical portion 33 can be taken in and out of the storage portion 32. Furthermore, the cylindrical portion 33 has a plurality of support portions 33f that enable the cylindrical portion 33 to be installed so as not to roll.

[0067] For example, the cylindrical portion 33 has an opening / closing portion 33d that opens and closes a side surface 33c of the cylindrical portion 33. The opening / closing portion 33d extends, for example, from one end to the other end in the axial direction D on a part of the side surface 33c. When the opening / closing portion 33d is closed, the ready-mixed concrete C is stored inside the cylindrical portion 33, and when the opening / closing portion 33d is open, the ready-mixed concrete C (coarse aggregate C1, etc.) is discharged from inside the cylindrical portion 33.

[0068] For example, carbon dioxide gas introduction section 35 has carbon dioxide gas cylinder 35b, piping 35c extending from carbon dioxide gas cylinder 35b to the inside of storage section 32, and vaporizer 35d provided in the middle of piping 35c. Carbon dioxide gas cylinder 35b is installed outside storage section 32, and piping 35c penetrates the wall of storage section 32. Carbon dioxide gas G is introduced into water W inside storage section 32 via carbon dioxide gas cylinder 35b, vaporizer 35d, and piping 35c.

[0069] For example, the carbon dioxide fixation device 31 includes a measurement unit 37 that measures the amount of carbon dioxide G fixed in the ready-mixed concrete C. The measurement unit 37 may measure the amount of carbon dioxide G fixed in the ready-mixed concrete C and quantitatively evaluate the value obtained as a result of the measurement. The measurement unit 37 has, for example, a display unit that digitizes and displays the amount of carbon dioxide G fixed in the ready-mixed concrete C in the storage unit 32.

[0070] The measuring unit 37 may measure the concentration of the fixed carbon dioxide G using a dissolved carbon dioxide sensor. Alternatively, the measuring unit 37 may measure the concentration of the fixed carbon dioxide G by irradiating the cement sludge C2 with X-rays and measuring the amount of calcium carbonate contained in the cement sludge C2. The measuring unit 37 may use an index of the carbonation degree of the cement hydrate in the ready-mixed concrete C, that is, the percentage of the CaO (calcium oxide) contained in the cement hydrate that becomes calcium carbonate through carbonation. As an example, the measuring unit 37 may calculate the carbonation region 1m of concrete using the following formula (1): 3 Amount of CO2 absorbed by cement per up may be calculated.

number

[0071] In equation (1), γ c is the degree of carbonation, C is the unit cement content of concrete (kg / m 3 ), CaO is the CaO content (%) of the cement, MCO2 is the molar mass of CO2 (= 44.0 g / mol), and MCaO is the molar mass of CaO (= 56.1 g / mol). The carbonation degree can be determined, for example, by the type of cement hydrate in the ready-mixed concrete C or the environmental conditions at the time of carbonation. For example, the carbonation degree may be 0.5, 0.75, or 0.8, or may be set to 0.35 to 0.37 assuming that only carbon and hydrogen (CH) in the hardened concrete contribute to the fixation of CO2. However, the method for measuring the amount of carbon dioxide fixed in the ready-mixed concrete C by the measuring unit 37 is not limited to the above example and can be changed as appropriate.

[0072] The measuring unit 37 may measure the amount of carbon dioxide G immobilized in the ready-mixed concrete C from at least one of the pH of the water W in the storage unit 32 and the concentration of carbon dioxide G inside the storage unit 32. For example, the carbon dioxide immobilization device 31 includes a pH sensor 38b and a carbon dioxide concentration measuring sensor 38c provided inside the storage unit 32.

[0073] The measuring unit 37 may be, for example, a monitoring panel that monitors the pH of the water W inside the storage unit 32 and the concentration of carbon dioxide gas. In this case, for example, the pH measured by the pH sensor 38b and the concentration of carbon dioxide gas G measured by the carbon dioxide gas concentration measuring sensor 38c are output to the measuring unit 37, and the measuring unit 37 can monitor the pH and concentration of carbon dioxide gas inside the storage unit 32.

[0074] The measuring unit 37 may be a monitoring control panel that controls the introduction of carbon dioxide gas G into the storage unit 32 by the carbon dioxide gas introducing unit 35. In this case, the measuring unit 37 controls the amount of carbon dioxide gas G introduced by the carbon dioxide gas introducing unit 35 in accordance with the concentration of carbon dioxide gas inside the storage unit 32. In this way, by controlling the amount of carbon dioxide gas G introduced by the carbon dioxide gas introducing unit 35 in accordance with the concentration of carbon dioxide gas G measured by the measuring unit 37, it is possible to feedback control the introduction of carbon dioxide gas G into the storage unit 32. Note that cement sludge C2 and the like are discharged from the storage unit 32 via piping 39b and a slurry extraction pump 39c.

[0075] As described above, the carbon dioxide fixation device 31 according to the second embodiment is a stationary device, and the cylindrical part 33 can be lifted from the storage part 32. Therefore, the carbon dioxide fixation device 31 has a compact configuration, and ready-mixed concrete C can be easily put in and taken out of the cylindrical part 33.

[0076] Furthermore, the carbon dioxide fixation device 31 is provided with a measurement unit 37 that measures the amount of carbon dioxide G fixed in the ready-mixed concrete C from at least one of the pH inside the storage unit 32 and the concentration of carbon dioxide G inside the storage unit 32. Therefore, since the amount of carbon dioxide G fixed in the ready-mixed concrete C is measured by the measurement unit 37, the amount of carbon dioxide G that has been reduced can be determined by the measurement by the measurement unit 37.

[0077] (Third embodiment) Next, a carbon dioxide gas fixation device 41 according to a third embodiment will be described with reference to Fig. 7. The carbon dioxide gas fixation device 41 has a storage section 42 that stores water W and a carbon dioxide gas introduction section 45 provided outside the storage section 42. The storage section 42 is made of steel, for example, and can be opened and closed by a lid similar to the lid 32b. The storage section 42 has a bottom surface 42f and a withdrawal drain 42g extending downward from the bottom surface 42f.

[0078] Inside the storage unit 42, for example, the height of the water surface W1 of the water W is higher than the upper end of the cylindrical portion 3. That is, in the third embodiment, the entire cylindrical portion 3 is immersed in the water W. The carbon dioxide gas introducing unit 45 has an outlet pipe 45b through which the cement sludge C2 and the water W flow out from the storage unit 42, an agitator 45c that agitates the cement sludge C2 and the water W that have flowed out from the outlet pipe 45b together with carbon dioxide gas G, and an inlet pipe 45d that introduces the cement sludge C2 and the water W that have been agitated together with carbon dioxide gas G by the agitator 45c into the storage unit 42.

[0079] Furthermore, the carbon dioxide gas introduction section 45 has a pump 45f provided in a part of the outflow pipe 45b, a carbon dioxide gas cylinder 45g, and a gas supply pipe 45h extending from the carbon dioxide gas cylinder 45g to a part of the outflow pipe 45b. The pump 45f causes the cement sludge C2 to flow out of the storage section 42 into the outflow pipe 45b, and carbon dioxide gas G is supplied to the outflow pipe 45b from the carbon dioxide gas cylinder 45g via the gas supply pipe 45h.

[0080] The agitator 45c is, for example, a line mixer arranged inside the sealed outlet pipe 45b and inlet pipe 45d. The agitator 45c is arranged downstream of the junction of the outlet pipe 45b and the gas supply pipe 45h in the flow path of the outlet pipe 45b, and mixes and agitates the cement sludge C2 and carbon dioxide G passing through the outlet pipe 45b. This can promote the fixation of the carbon dioxide G in the cement sludge C2.

[0081] The cement sludge C2 in which carbon dioxide G has been immobilized in the agitator 45c flows into the storage unit 42 via the inlet pipe 45d. The cement sludge C2 repeatedly flows out of the storage unit 42 to the agitator 45c and in from the agitator 45c to the storage unit 42, further promoting the immobilization of carbon dioxide G in the cement sludge C2. The cement sludge C2 in which carbon dioxide G has been immobilized is drawn out of the storage unit 42 via the draw-out drain 42g extending from the bottom surface 42f of the storage unit 42. As described above, the carbon dioxide immobilization device 41 according to the third embodiment can further promote the immobilization of carbon dioxide G in the ready-mixed concrete C (cement sludge C2).

[0082] Various embodiments of the carbon dioxide gas fixation device according to the present disclosure have been described above. However, the present disclosure is not limited to the above-described embodiments and may be further modified within the scope of the claims. In other words, the configuration, shape, size, number, material, and arrangement of each part of the carbon dioxide gas fixation device are not limited to the above-described embodiments and can be modified as appropriate. Furthermore, although the first, second, and third embodiments have been described above, the carbon dioxide gas fixation device may be a combination of at least a portion of the first embodiment, at least a portion of the second embodiment, and at least a portion of the third embodiment.

[0083] For example, in the above-described embodiment, the carbon dioxide gas fixation device 1 is described, which includes a mesh-shaped cylindrical portion 3. In the present disclosure, the configuration of the cylindrical portion housed in the housing portion can be changed as appropriate. FIGS. 8(a), 8(b), and 8(c) show cylindrical portions 53, 63, and 73 according to modified examples. Cylindrical portion 53, 63, and 73 can all be housed in the housing portion 2, 32, and 42 described above.

[0084] 8(a), the cylindrical portion 53 has a sliding portion 53b that allows the coarse aggregate C1 inside to slide easily. The cylindrical portion 53 has, for example, a mesh portion 53c having through holes 3b formed therein and a sliding portion 53b that does not have through holes 3b. By having the sliding portion 53b in the cylindrical portion 53, it is possible to make it easier to discharge the coarse aggregate C1 from the cylindrical portion 53 when the cylindrical portion 53 is tilted by the tilting device 9, for example.

[0085] 8(b), the cylindrical portion 63 may have a water agitator 63b. The water agitator 63b is, for example, a spiral agitator blade that agitates the water W as it rotates. In this case, the water W is agitated by the water agitator 63b together with the ready-mixed concrete C and carbon dioxide G inside the storage portion, which further promotes the fixation of the carbon dioxide G in the ready-mixed concrete C.

[0086] As shown in FIG. 8(c), the cylindrical portion 73 has an inner surface 73b and an aggregate discharge portion 73c protruding from the inner surface 73b. The aggregate discharge portion 73c is, for example, a spiral blade formed on the inner surface 73b. When a rotary drive unit such as the rotary drive unit 4 rotates the cylindrical portion 73 in which the coarse aggregate C1 remains, the aggregate discharge portion 73c, which is a spiral blade, transports the coarse aggregate C1 to one side in the axial direction. This transport of the coarse aggregate C1 to one side in the axial direction allows the coarse aggregate C1 to be discharged from the cylindrical portion 73. Therefore, the coarse aggregate C1 can be discharged from the cylindrical portion 73 by rotating the cylindrical portion 73 without tilting it using a tilting device 9 or the like.

[0087] In the above-described embodiment, a batch-type carbon dioxide fixation apparatus 1 has been described. However, the carbon dioxide fixation apparatus according to the present disclosure may be a continuous-type carbon dioxide fixation apparatus in which ready-mixed concrete is continuously introduced into the cylindrical part and the separated cement sludge in which carbon dioxide is immobilized is continuously discharged. In this way, there are no particular limitations on the timing of introducing ready-mixed concrete into the cylindrical part and the timing of discharging ready-mixed concrete from the storage part (cylindrical part).

[0088] In the above-described embodiment, the carbon dioxide gas introduction unit 5 is described, which introduces carbon dioxide gas G into the water W inside the storage unit 2 as air bubbles. However, carbon dioxide gas as a gas, a liquid, or a solid (e.g., dry ice) may be introduced into the storage unit, and the form of carbon dioxide gas introduced into the storage unit is not particularly limited. When carbon dioxide gas is introduced as dry ice, for example, a bag material containing dry ice obtained by solidifying carbon dioxide gas (carbon dioxide) generated industrially is introduced into the storage unit 2. A water-soluble bag material is used as this bag material. In this case, the bag material containing the dry ice dissolves inside the storage unit 2. The water-soluble bag material is made of, for example, a water-soluble film or water-soluble paper. An example of the water-soluble film is made of polyvinyl alcohol. The water-soluble paper is made of, for example, at least one of wood pulp, polysaccharides, poval, cellulose, polyvinyl alcohol, carbomethyl cellulose, and starch.

[0089] The dry ice contained in the bag material is granular. Granular dry ice is produced, for example, by a freeze-crushing device. The size of the dry ice particles is preferably 50 mm or less, more preferably 10 mm or less, and even more preferably 5 mm or less. In this way, when the granular dry ice is introduced into the storage section 2, the dry ice can be sublimated within the storage section 2 in a short period of time.

[0090] The weight of the water-soluble bag material that contains the dry ice is, for example, about several kilograms. The dimensions, shape, and weight of the water-soluble bag material that contains the dry ice are set appropriately according to the storage section 2. The water-soluble bag material that contains the dry ice may be stored, for example, inside a storage container provided around the storage section 2 (for example, adjacent to the carbon dioxide gas introduction section 5). This storage container has high cold retention properties. The water-soluble bag material that contains the dry ice may be introduced into the storage section 2 from a chute connected to the opening of the storage container so that it rolls into the rotating drum. In this way, the means for introducing the dry ice into the storage section 2 can be changed appropriately.

[0091] In the above-described embodiment, the cylindrical portion 3 has been described as having a double-tube structure. However, the cylindrical portion may be a triple-tube structure, and the number of tubes constituting the cylindrical portion is not particularly limited. Furthermore, in the above-described embodiment, an example has been described in which the rotation drive unit 4 rotates both the inner tube 3A and the outer tube 3B. However, the rotation drive unit may rotate only the inner tube, and the manner of rotation of the cylindrical portion can be changed as appropriate. [Explanation of symbols]

[0092] 1...carbon dioxide fixation device, 2...storage section, 2b...lid, 3...cylindrical section, 3A...inner tube, 3b...through hole, 3B...outer tube, 3c...first through hole, 3d...second through hole, 4...rotation drive section, 4b...shaft section, 4c...motor, 5...carbon dioxide gas introduction section, 5b...piping, 5c...carbon dioxide gas cylinder, 6...covering member, 7...water injection means, 8...setting retarder injection means, 9...tilting device, 10, 10A...running body, 10b...cabin, 11...loading platform, 12...running device, 12b...vehicle body, 12c...vehicle Ring, 12d...internal combustion engine, 12f...radiator, 12g...pipe, 13...extraction section, 14...crane device, 15...hopper, 20...solid-liquid separation device, 21...collection device, 21b...suction section, 21c...suction tube, 21d...main body, 21f...drainage tube, 22...filter device, 22b...main body, 22c...filter press, 22d...tank, 22f...water supply tube, 31...carbon dioxide fixation device, 31b...pipe, 32...storage section, 32b...lid, 33...Cylindrical portion, 33b...Wire, 33c...Side, 33d...Opening and closing portion, 33f...Support portion, 35...Carbon dioxide gas inlet portion, 35b...Carbon dioxide gas cylinder, 35c...Piping, 35d...Vaporizer, 36...Agitator, 37...Measuring portion, 38b...pH sensor, 38c...Carbon dioxide gas concentration measuring sensor, 39b...Piping, 39c...Slurry extraction pump, 41...Carbon dioxide gas fixation device, 42...Storage portion, 42f...Bottom, 42g...Extraction drain, 45...Carbon dioxide gas inlet portion, 45b...Flow Outlet pipeline, 45c...mixing device, 45d...inlet pipeline, 45f...pump, 45g...carbon dioxide cylinder, 45h...gas supply pipeline, 53...cylindrical section, 53b...sliding section, 53c...mesh section, 63...cylindrical section, 63b...water mixing section, 73...cylindrical section, 73b...inner surface, 73c...aggregate discharge section, A...construction site (site), C...ready mixed concrete, C1...coarse aggregate (aggregate), C2...cement sludge, D...axial direction, G...carbon dioxide, K...setting retarder, L...axis, W...water, W1...water surface.

Claims

1. a storage section for storing water; A cylindrical section provided inside the storage section and into which unused ready-mixed concrete is poured; a rotation drive unit that rotates the cylindrical portion around a shaft portion that extends in an axial direction, which is a direction in which the axis of the cylindrical portion extends; a carbon dioxide gas introduction section that introduces carbon dioxide gas into the storage section; Equipped with the cylindrical portion is formed in a mesh shape with a plurality of through holes communicating the inside and outside of the cylindrical portion; The carbon dioxide gas introduction unit introduces carbon dioxide gas into the cylindrical portion that accommodates the ready-mixed concrete and is rotated by the rotation drive unit, A setting retarder injection means is provided for injecting a setting retarder into the storage section. Carbon dioxide fixation device.

2. a storage section for storing water; A cylindrical section provided inside the storage section and into which unused ready-mixed concrete is poured; a rotation drive unit that rotates the cylindrical portion around a shaft portion that extends in an axial direction, which is a direction in which the axis of the cylindrical portion extends; a carbon dioxide gas introduction section that introduces carbon dioxide gas into the storage section; Equipped with the cylindrical portion is formed in a mesh shape with a plurality of through holes communicating the inside and outside of the cylindrical portion; The carbon dioxide gas introduction unit introduces carbon dioxide gas into the cylindrical portion that accommodates the ready-mixed concrete and is rotated by the rotation drive unit, A measuring unit is provided which measures the amount of carbon dioxide gas fixed in the ready-mixed concrete from at least one of the pH inside the storage unit and the concentration of carbon dioxide gas inside the storage unit. Carbon dioxide fixation device.

3. a storage section for storing water; A cylindrical section provided inside the storage section and into which unused ready-mixed concrete is poured; a rotation drive unit that rotates the cylindrical portion around a shaft portion that extends in an axial direction, which is a direction in which the axis of the cylindrical portion extends; a carbon dioxide gas introduction section that introduces carbon dioxide gas into the storage section; Equipped with the cylindrical portion is formed in a mesh shape with a plurality of through holes communicating the inside and outside of the cylindrical portion; The carbon dioxide gas introduction unit introduces carbon dioxide gas into the cylindrical portion that accommodates the ready-mixed concrete and is rotated by the rotation drive unit, a running body that carries the storage section, the cylindrical section, the rotation drive section, and the carbon dioxide gas introduction section; Carbon dioxide fixation device.

4. the cylindrical portion includes an inner tube and an outer tube, The plurality of through holes include a plurality of first through holes communicating the inside and outside of the inner tube and a plurality of second through holes communicating the inside and outside of the outer tube. The carbon dioxide fixation device according to any one of claims 1 to 3.

5. The rotation drive unit rotates the cylindrical portion into which the fresh concrete has been poured, and separates the fresh concrete into the cement sludge and the aggregate by leaving the aggregate of the fresh concrete inside the cylindrical portion and discharging the cement sludge of the fresh concrete from the cylindrical portion, The carbon dioxide gas introduction unit introduces the carbon dioxide gas into the cement sludge separated from the aggregate. The carbon dioxide fixation device according to any one of claims 1 to 3.

6. an extracting section that extracts from the storage section a precipitate containing calcium carbonate that is produced by introducing the carbon dioxide gas into the cement sludge, The carbon dioxide fixation device according to claim 5.

7. a tilting device that tilts the storage section to discharge the aggregate remaining inside the cylindrical section from the cylindrical section; The carbon dioxide fixation device according to claim 5.

8. a conduit for supplying exhaust gas generated by driving the traveling body to the carbon dioxide gas introducing section, The carbon dioxide gas introduction unit introduces the exhaust gas together with the carbon dioxide gas into the storage unit. The carbon dioxide fixation device according to claim 3.

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