Recovery and distribution system for carbon dioxide and calcium compound

Abstract

To provide a recovery and distribution system for carbon dioxide and calcium compounds, which enables efficiently recovering of carbon dioxide contained in exhaust gas generated at a factory facility as well as a construction site, and calcium compounds contained in a calcium-containing material such as fresh concrete sludge, and performing distribution of the calcium compounds that may serve as valuable resources.SOLUTION: Provided is a recovery and distribution system for carbon dioxide and calcium compounds, comprising: a substance recovery facility for recovering at least one substance selected from calcium-containing substances including calcium compounds, and carbon dioxide contained in exhaust gas, the exhaust gas being generated in at least one factory facility as well as one construction site; an intermediate facility including a receiving facility for receiving the recovered substance; a storage facility for storing the substance, a classification facility for classifying the substance according to its properties, and a reaction facility for performing reaction of the substance; and a shipment facility for shipping a supply material by usage, as a product, from the receiving facility or intermediate facility.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to a carbon dioxide and calcium compound recovery and distribution system. [Background technology]

[0002] In recent years, interest in global warming has grown, and there is a demand for reducing the amount of carbon dioxide emitted into the atmosphere. At various facilities, such as power plants, incinerators, cement plants, ready-mix concrete plants, precast concrete plants, steel mills, and other industrial facilities, efforts are being made to reduce and capture the amount of exhaust gases, including carbon dioxide, emitted into the atmosphere during their operations. Reducing carbon dioxide emissions from cement plants, in particular, is seen as an urgent issue.

[0003] For example, Patent Document 1 discloses a method for producing calcium carbonate, which includes a carbon dioxide absorption step of absorbing carbon dioxide gas in exhaust gas from a combustion furnace or the like with a caustic soda solution by a gas-liquid contact method to produce a sodium carbonate solution, a step of hydrating quicklime to produce milk of lime, and a carbonation step of reacting the milk of lime with the sodium carbonate solution produced in the carbon dioxide absorption step. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-293537 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a system for recovering and distributing carbon dioxide and calcium compounds, which is capable of efficiently recovering carbon dioxide contained in exhaust gases generated at factory facilities and construction sites, and calcium compounds contained in calcium-containing materials such as ready-mixed concrete sludge, and distributing calcium compounds that can be used as valuable resources. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides the following carbon dioxide and calcium compound recovery and distribution system. 1. A material recovery facility for recovering at least one substance selected from carbon dioxide and calcium-containing substances including calcium compounds contained in exhaust gas generated at at least one factory facility and construction site; a receiving facility for receiving said material; storage facilities for said substances; a sorting facility for sorting the materials according to their properties; and an intermediate facility having a reaction facility for carrying out the reaction of the substances; a shipping facility that ships the supplies from the receiving facility or the intermediate facility as products according to their intended use; A carbon dioxide and calcium compound recovery and distribution system comprising:

[0007] Furthermore, the present invention provides the following carbon dioxide and calcium compound recovery and distribution system as a preferred embodiment. 2. Further, a receiving facility for receiving materials for product preparation; a storage facility for the ingredients for preparing the product; and equipment for preparing a preparation comprising said substance and said product preparation ingredients; Equipped with 2. The carbon dioxide and calcium compound recovery and distribution system according to claim 1, wherein the shipping facility ships the prepared product as a product according to its intended use. 3. A system for recovering and distributing carbon dioxide and calcium compounds according to the above item 1 or 2, wherein the calcium-containing material is calcium-containing waste. 4. A system for recovering and distributing carbon dioxide and calcium compounds according to any one of the above 1 to 3, wherein the recovery of the substances is carried out using at least one of the following means (1) to (3): Means (1) A transport means for loading the substance Means (2) A transport means for carrying a carbon dioxide absorption tower having a supply port for the exhaust gas and a discharge port for the exhaust gas, and storing an aqueous solution of an alkali metal hydroxide. Means (3) A transport means for loading a carbon dioxide absorption tower, the transport means having a carbon dioxide recovery tower equipped with a supply port for an alkali metal-containing aqueous solution, a screen, and a supply port for an exhaust gas containing carbon dioxide, the supply port for the aqueous solution being provided in an upper part of the carbon dioxide recovery tower, the supply port for the exhaust gas being provided in a lower part of the carbon dioxide absorption tower, the screen being provided between the supply port for the aqueous solution and the supply port for the exhaust gas, and a calcium-containing material being placed on the screen. 5. The system for recovering and distributing carbon dioxide and calcium compounds according to the above 4, wherein the calcium-containing material in the means (3) is selected from calcium-containing waste and calcium-containing minerals. 6. The system for recovering and distributing carbon dioxide and calcium compounds according to 4 or 5 above, wherein the aqueous solution of alkali metal hydroxide is produced in the reaction facility. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a carbon dioxide and calcium compound recovery and distribution system that can efficiently recover carbon dioxide contained in exhaust gases generated at factory facilities and construction sites, and calcium compounds contained in calcium-containing materials such as ready-mixed concrete sludge, and also distribute calcium compounds that can be used as valuable resources. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing a preferred embodiment of a system for recovering and distributing carbon dioxide and calcium compounds according to the present embodiment. [Figure 2] FIG. 1 is a schematic diagram showing a preferred embodiment of a carbon dioxide capture tower employed in the carbon dioxide and calcium compound recovery and distribution system of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention (hereinafter, sometimes referred to as "the present embodiment") will be described. The present invention is not limited to the following embodiment, and can be implemented with any modifications within the scope that does not impair the effects of the invention. In this specification, the notation of a numerical range as "AA to BB" means "at least AA and at most BB." In addition, in this specification, the numbers associated with "at least," "at most," and "to" in describing a numerical range are numbers that can be arbitrarily combined. For example, when a certain numerical range is described as "CC to DD" and "EE to FF," the numerical ranges "CC to FF" and "EE to DD" are also included.

[0011] [Recovery and distribution system for carbon dioxide and calcium compounds] The carbon dioxide and calcium compound recovery and distribution system of this embodiment includes: a material recovery facility for recovering at least one substance selected from carbon dioxide and calcium-containing substances including calcium compounds contained in exhaust gas generated in at least one factory facility and construction site; a receiving facility for receiving said material; storage facilities for said substances; a sorting facility for sorting the materials according to their properties; and an intermediate facility having a reaction facility for carrying out the reaction of the substances; and a shipping facility that ships the supplies from the receiving facility or the intermediate facility as products according to their intended use. That is it.

[0012] The production method described in Patent Document 1 aims to produce calcium carbonate by utilizing carbon dioxide contained in exhaust gases from combustion furnaces such as lime kilns, boilers, refuse incinerators, and cement incinerators (Patent Document 1, Problems to be Solved by the Invention section). This method requires equipment for performing at least three steps: a carbon dioxide gas absorption step, a milk of lime production step, and a carbonation step. This naturally results in a large and complicated apparatus. Among the various facilities that emit exhaust gases containing carbon dioxide, such as the power plants, incinerators, cement plants, steel mills, and factory facilities, some large-scale plants can independently implement the method described in Patent Document 1, while others are small- and medium-sized plants that cannot independently implement the method due to site limitations, economic constraints, and other reasons. Therefore, there is a demand for a method and apparatus for producing calcium carbonate by utilizing carbon dioxide emitted from these various facilities that is versatile enough to easily accommodate increases or decreases in scale and be miniaturized, allowing installation anywhere.

[0013] Incidentally, among the various facilities, such as power plants, incinerators, cement plants, steel mills, and factory facilities, which emit exhaust gases containing carbon dioxide, some facilities generate substances containing calcium compounds (hereinafter also referred to as "calcium-containing materials"). Examples of calcium-containing materials include materials that have primarily been disposed of, such as ready-mixed concrete sludge, waste concrete, garbage incineration ash, biomass ash, and slaked lime. By producing calcium carbonate by reacting the calcium compounds contained in such calcium-containing materials with carbon dioxide emitted from the various facilities, it is possible to reduce the amount of carbon dioxide released into the atmosphere while effectively utilizing the calcium contained in the calcium-containing materials. In this regard, the method described in Patent Document 1 employs quicklime as the calcium compound, but does not consider other calcium compounds, i.e., does not consider the effective utilization of calcium-containing materials emitted from various facilities, such as factory facilities.

[0014] Furthermore, calcium-containing waste such as ready-mixed concrete sludge is mainly generated at ready-mixed concrete plants and precast concrete plants, but may also be generated at various other sites, such as construction sites and building sites. Because these various sites are temporary, it is not practical to treat calcium-containing waste generated as work progresses on-site. Furthermore, the method described in Patent Document 1 lacks versatility as mentioned above, and therefore cannot be applied to various sites.

[0015] The inventors of the present invention have focused on the above phenomenon and have conceived the idea that this problem could be solved by accepting at least one substance selected from carbon dioxide and calcium-containing substances contained in exhaust gases, which are emissions from various large and small factory facilities and construction sites, in one lump sum, subjecting them to various treatments, and distributing them. By accepting emissions from these factory facilities and construction sites in one lump sum, it is possible to recover more carbon dioxide contained in exhaust gases, calcium-containing substances, and other emissions that have previously been discarded, in a more efficient manner. Furthermore, if the emissions can be distributed as valuable materials using reaction facilities as needed, not only will economic benefits be obtained, but it will also be possible to contribute to society by reducing the environmental burden.

[0016] Fig. 1 is a schematic diagram showing a preferred embodiment of the carbon dioxide and calcium compound recovery and distribution system of this embodiment. Hereinafter, each piece of equipment included in the carbon dioxide and calcium compound recovery and distribution system of this embodiment will be described with reference to Fig. 1.

[0017] (Collection equipment) The recovery facility recovers at least one substance selected from carbon dioxide and calcium-containing substances including calcium compounds contained in exhaust gases generated at at least one factory facility and construction site.

[0018] The substances that can be recovered in the recovery and distribution system of this embodiment include carbon dioxide contained in exhaust gases generated at factory facilities and construction sites, and calcium-containing substances including calcium compounds, and can be recovered and accepted without any particular restrictions. The calcium compound contained in the calcium-containing material can be recovered and accepted without any particular limitation as long as it is a compound containing calcium, and preferred examples include calcium hydroxide and calcium oxide. These calcium compounds are useful in recovering carbon dioxide because they react with carbon dioxide to produce calcium carbonate.

[0019] The calcium-containing material may be, for example, a product manufactured in various factory facilities, or may be waste. Considering the feature of the recovery and distribution system of this embodiment in that calcium compounds that can be used as valuable materials can be produced in reaction facilities as needed and then distributed, it is preferable that the material be waste (also referred to as "calcium-containing waste").

[0020] A representative example of calcium-containing waste is sludge-containing material. This is because sludge-containing material contains calcium hydroxide and calcium oxide. Sludge-containing material is not particularly limited as long as it contains sludge, and examples include residual concrete, concrete washing wastewater, sludge (including sludge solids), sludge water, etc. (See JIS A5308:2019 (Ready-Mixed Concrete)). Examples include residual concrete, concrete washing wastewater, sludge, and sludge water containing the same generated in various factories such as ready-mixed concrete factories, cement factories, and factories manufacturing various products. Sludge may be either dry powder or wet powder. Supernatant water as defined in JIS A5308:2019 (Ready-Mixed Concrete) is also an example of a sludge-containing material. For example, residual concrete, concrete washing wastewater, sludge, sludge water, supernatant water, etc. generated in the concrete manufacturing process at these various factories can be accepted as sludge-containing materials as they are, or they can be accepted after being treated, for example, by sieving, if necessary.

[0021] Other examples include residual concrete, concrete washing wastewater, sludge, and sludge water containing this, which are generated at various construction sites, such as building construction sites and road construction sites, where concrete is used. These residual concrete, concrete washing wastewater, sludge, sludge water, and supernatant water are included in sludge-containing materials, just like the sludge-containing materials generated at the various factories mentioned above. More specifically, sludge-containing materials generated at various construction sites include unused leftover concrete, slurries obtained by adding water to the concrete, materials containing fine powders such as cement obtained by separating coarse particles such as aggregate contained in the slurries, residues containing concrete generated after washing agitator trucks, etc., materials containing fine powders such as cement obtained by separating coarse particles such as aggregate from the residues, etc. Typical examples of construction sites include those for condominiums and buildings, and dams, while typical examples of road construction sites include those for general roads, forest roads, etc., and expressway construction sites.

[0022] The recovery facility recovers the exhaust gas and calcium-containing substances generated at at least one factory facility and construction site. There are no particular limitations on the recovery of the substances as long as the exhaust gas and calcium-containing substances can be recovered, and it is preferable to use at least one of the following means (1) to (3). Means (1) A transport means for loading the substance Means (2) A transport means for carrying a carbon dioxide absorption tower having a supply port for the exhaust gas and a discharge port for the exhaust gas, and storing an aqueous solution of an alkali metal hydroxide. Means (3) A transport means for loading a carbon dioxide absorption tower, the transport means having a carbon dioxide recovery tower equipped with a supply port for an alkali metal-containing aqueous solution, a screen, and a supply port for an exhaust gas containing carbon dioxide, the supply port for the aqueous solution being provided in an upper part of the carbon dioxide recovery tower, the supply port for the exhaust gas being provided in a lower part of the carbon dioxide absorption tower, the screen being provided between the supply port for the aqueous solution and the supply port for the exhaust gas, and a calcium-containing material being placed on the screen.

[0023] The transportation means of the above means (1) is a means for loading and transporting a substance, and can be carried out using transportation machinery such as vehicles such as dump trucks and tanker trucks, railways, ships such as bulk carriers, etc. More specifically, a storage container for storing exhaust gas and calcium-containing substances can be installed on the transportation machinery, and the substances can be stored in a storage tank and recovered.

[0024] In the method (1), when the exhaust gas is transported, the exhaust gas may be filled into a storage container such as a gas tank or cylinder and then collected. When the calcium-containing material is transported, the calcium-containing material may be stored in a storage container appropriate for its state (assumed to be liquid (slurry) or solid) and then collected.

[0025] Figure 1 shows the collection of materials by vehicle. For example, the vehicle may collect materials at one factory facility or construction site and receive them at a receiving facility, or the vehicle may travel around the factory facility and construction site as shown in Figure 1 to collect materials and receive the collected materials at a receiving facility described below. From the perspective of more efficient material collection, it is preferable to travel around multiple locations selected from the factory facility and construction site, collect materials from the multiple locations, and receive them at the receiving facility. Furthermore, with regard to the storage containers for loading substances, one storage container may be provided on the transport machine, or multiple storage containers may be provided, and if multiple storage containers are provided, a storage container for recovering exhaust gas and a storage container for calcium-containing substances may be provided.

[0026] The means (2) is a transportation means having an exhaust gas supply port and an exhaust gas discharge port, and carrying a carbon dioxide absorption tower that stores an aqueous solution of an alkali metal hydroxide. For example, a carbon dioxide absorption tower can be installed in a transportation machine that can be used in the above-mentioned means (1), and carbon dioxide contained in substances, particularly exhaust gas, can be absorbed and recovered in the carbon dioxide absorption tower. In other words, the means (2) is a means that uses a carbon dioxide absorption tower instead of a storage container that can be used in the above-mentioned means (1).

[0027] The carbon dioxide absorption tower used in means (2) is not particularly limited as long as it has an exhaust gas supply port and an exhaust gas discharge port and stores an aqueous solution of alkali metal hydroxide, and for example, is preferably an absorption tower having a structure in which the exhaust gas supply port is located at the bottom of a storage container for the aqueous solution of alkali metal hydroxide and the exhaust gas discharge port is located at the top. The exhaust gas supplied from the bottom is easily brought into contact with the aqueous solution of alkali metal hydroxide stored in the storage container, so that the alkali metal hydroxide is converted into alkali metal carbonate, which makes it easier to absorb carbon dioxide in the exhaust gas. From the viewpoint of facilitating the absorption of carbon dioxide in the exhaust gas, it is preferable to provide a nozzle capable of supplying the exhaust gas while bubbling it.

[0028] The alkali metal constituting the alkali metal hydroxide used in the method (2) is preferably lithium, sodium, or potassium, more preferably sodium or potassium, and even more preferably sodium. These alkali metals can be used alone or in combination.

[0029] The size of the carbon dioxide absorption tower used in means (2) cannot be generalized because it differs depending on, for example, the type of transport vehicle on which it is mounted and the size of the transport vehicle, and also depends on how many absorption towers are mounted on the transport vehicle. Because the structure of the carbon dioxide absorption tower is simple as described above, it is extremely easy to adjust it to a desired size.

[0030] The means (3) can install a carbon dioxide absorption tower in a transport machine that can be used in the above-mentioned means (1), for example, and absorb and recover carbon dioxide contained in a substance, particularly in exhaust gas, in the carbon dioxide absorption tower. That is, the means (3) is also a means that uses a carbon dioxide absorption tower instead of a storage container that can be used in the above-mentioned means (1), and the means (2) and means (3) differ in the type of carbon dioxide absorption tower used.

[0031] The carbon dioxide absorption tower employed in the means (3) will be described with reference to Fig. 2. Fig. 2 is a schematic diagram showing a preferred embodiment of the carbon dioxide absorption tower employed in the means (3). The carbon dioxide recovery device shown in FIG. 2 has a carbon dioxide absorption tower, which has a supply port for an alkali metal-containing aqueous solution at its upper part, a supply port for flue gas at its lower part, and a screen provided between the supply port for the alkali metal-containing aqueous solution and the supply port for flue gas. In other words, the carbon dioxide absorption tower has a supply port for the alkali metal-containing aqueous solution, a screen, and a supply port for flue gas containing carbon dioxide provided in this order from the top.

[0032] By providing the supply port and the screen in the carbon dioxide absorption tower with such a configuration, reactions between the alkali metal-containing aqueous solution, the carbon dioxide-containing exhaust gas, and the calcium-containing substance occur simultaneously in the carbon dioxide absorption tower. Preferred examples of the reactions that occur in the carbon dioxide absorption tower include the following reactions 1 and 2. Reaction 1:2M A OH+CO2→M A2 CO3+H2O Reaction 2: M A2 CO3 + CaO + H2O → CaCO3 + 2M A OH In the above reactions 1 and 2, M A indicates an alkali metal ion.

[0033] In this way, the calcium-containing material functions as a filler and as a calcium supply source, allowing the above reactions 1 and 2 to proceed simultaneously inside the carbon dioxide absorption tower. The above reactions 1 and 2, i.e., obtaining an aqueous solution of alkali carbonate and obtaining the calcium carbonate, can be performed in a single carbon dioxide absorption tower. Therefore, the carbon dioxide absorption tower can be made smaller, and a recovery device can be provided that can be installed anywhere. The carbon dioxide absorption towers used in the means (2) and (3) can be selected according to requirements, and when further miniaturization is required, it is preferable to employ the carbon dioxide absorption tower of the means (3).

[0034] 2, the carbon dioxide absorption tower preferably has two or more screens, as shown in FIG. 2. This can promote the reactions 1 and 2, and therefore can improve the versatility of the device, such as enabling more efficient and more compact design, and can also reduce carbon dioxide. When two or more screens are used, it is sufficient that the calcium-containing material is placed on one of the screens, and it is preferable that the calcium-containing material is placed on all of the screens as shown in FIG. From the same viewpoint, it is preferable that the carbon dioxide absorption tower has two or more supply ports for the alkali metal-containing aqueous solution and two or more screens. In this case, it is more preferable that the carbon dioxide absorption tower has two or more supply ports for the alkali metal-containing aqueous solution and two or more screens, and that the screens and the supply ports for the alkali metal-containing aqueous solution are provided alternately from the bottom to the top of the carbon dioxide absorption tower. It is even more preferable that a calcium-containing material is provided on all of the screens.

[0035] The carbon dioxide capture tower may be provided with an internal pipe for supplying an alkali metal-containing aqueous solution to the interior from a supply port for the alkali metal-containing aqueous solution. Furthermore, a pipe equipped with a spraying tool such as a shower nozzle may be used as the internal pipe. The carbon dioxide capture tower may be provided with an internal pipe for supplying a carbon dioxide-containing flue gas to the interior from a supply port for the carbon dioxide-containing flue gas, and a pipe having a curved shape at the bottom of the carbon dioxide capture tower is preferred, as shown in FIG. 2 . Furthermore, the carbon dioxide capture tower may be provided with a demister to remove mist, impurities, and the like from the exhaust gas discharged to the outside, as shown in Fig. 2. As the demister, a wire screen demister made of metal or synthetic resin, or the like, can be used.

[0036] The carbon dioxide capture tower preferably includes a storage tank for storing the alkali metal-containing aqueous solution below the supply port for the carbon dioxide-containing exhaust gas. By providing the storage tank at the lowest part of the carbon dioxide capture tower, the carbon dioxide capture tower can be made smaller. The aqueous alkali metal solution stored in the storage tank may be supplied from an inlet for the aqueous alkali metal solution provided in the carbon dioxide capture tower, that is, the aqueous alkali metal solution may be circulated during operation.

[0037] Furthermore, for easy transportation and installation, it is preferable that the carbon dioxide absorption tower has a disassembly structure, for example, a structure that allows the carbon dioxide absorption tower to be divided into two or more parts in the horizontal direction, or a structure that allows the spraying jig for the alkali metal-containing aqueous solution and the screen to be detachable.

[0038] The alkali metal-containing aqueous solution can be any aqueous solution containing an alkali metal, and is preferably an aqueous solution of an alkali metal salt. Examples of alkali metal salts include alkali metal hydroxides such as lithium hydroxide, sodium hydroxide, and potassium hydroxide. Among these, sodium hydroxide and potassium hydroxide are preferred, with sodium hydroxide being more preferred. For example, waste alkalis such as waste soda solution, photographic developer waste, degreasing waste, and metal soap waste also contain alkali metals, and these can be used as the alkali metal-containing aqueous solution. Alternatively, an aqueous solution of concentrated alkali metals obtained by separating a liquid containing an alkali metal salt, such as seawater, by electrolysis, membrane separation, or the like, can also be used. Furthermore, when the above-mentioned means (2) and means (3) are used in combination, it is preferable that the alkali metal constituting the alkali metal hydroxide in means (2) and the alkali metal constituting the alkali metal salt in means (3) are the same alkali metal.

[0039] The calcium-containing material is preferably a material containing calcium oxide, from the viewpoint of facilitating the above-mentioned preferred reactions 1 and 2. Examples of materials capable of promoting reactions 1 and 2, preferably containing calcium oxide, include calcium-containing waste materials such as garbage incineration ash, slag, waste concrete, ready-mixed concrete sludge, and biomass ash, as well as calcium-containing minerals such as calcium hydroxide and slaked lime. As mentioned above, the ready-mixed concrete sludge is waste generated mainly in ready-mixed concrete plants and precast concrete plants. The ready-mixed concrete sludge generated in these plants can be used as is, or can be formed into ready-mixed concrete sludge cake and used. Therefore, the calcium-containing substance can be procured from, for example, a factory facility or a construction site where the substance is recovered, and the alkali metal-containing aqueous solution can also be procured from, for example, a factory facility or a construction site where the substance is recovered.

[0040] As with the carbon dioxide absorption tower used in the above-mentioned means (2), the size of the carbon dioxide absorption tower used in means (3) cannot be generalized because it varies depending on, for example, the type of transport vehicle on which it is mounted and the size of the transport vehicle, and also depends on how many absorption towers are mounted on the transport vehicle. Because the structure of the carbon dioxide absorption tower is simple as described above, it is extremely easy to adjust it to a desired size.

[0041] In the recovery facility, at least one of the means (1) to (3) can be used as a transportation means. For example, while employing the means (2), the storage container for the calcium-containing substance of the means (1) can be simultaneously employed to recover the calcium-containing substance. That is, the storage container for the calcium-containing substance of the means (1) and the carbon dioxide absorption tower of the means (2) can be installed in one transport machine, and the calcium-containing substance and the carbon dioxide contained in the exhaust gas can be recovered by the one transport machine. Furthermore, while employing the means (3), by simultaneously employing the storage container for the calcium-containing substance of the means (1) to recover the calcium-containing substance, the calcium-containing substance and the carbon dioxide contained in the exhaust gas can also be recovered by the one transport machine.

[0042] In the recovery facility, the above-mentioned means (2) and means (3) can also be employed. Carbon dioxide can be recovered by means (2) and (3), but in the case of means (2), an alkali metal carbonate is obtained by recovering carbon dioxide. On the other hand, in the case of means (3), calcium carbonate is obtained by recovering carbon dioxide. Therefore, either means (2) or (3) can be employed depending on whether it is desired to obtain an alkali metal carbonate or calcium carbonate. It is also possible to simultaneously adopt the measures (1) to (3).

[0043] [Receiving facilities] The receiving facility is a facility that receives at least one substance selected from carbon dioxide contained in exhaust gas and calcium-containing substances including calcium compounds, which are generated at at least one factory facility and construction site and recovered by the recovery facility.

[0044] The materials received at the receiving facility are carbon dioxide contained in the exhaust gas and calcium-containing materials containing calcium compounds. For example, in the case of the above-mentioned method (1), carbon dioxide contained in the exhaust gas is received as exhaust gas or carbon dioxide, and calcium-containing materials are received as ready-mixed concrete sludge or ready-mixed concrete sludge cake, etc.

[0045] In the case of means (2), the carbon dioxide contained in the exhaust gas is accepted as an alkali metal carbonate. In the case of means (3), the carbon dioxide contained in the flue gas is accepted as calcium carbonate. Furthermore, when a calcium compound such as ready-mixed concrete sludge or ready-mixed concrete sludge cake is used as a calcium-containing material in the carbon dioxide capture tower, the calcium-containing material is accepted as calcium carbonate through a reaction between the carbon dioxide contained in the flue gas and the calcium compound contained in the calcium-containing material.

[0046] The receiving facility is not particularly limited in terms of its type, etc., as long as it can receive carbon dioxide and calcium-containing substances including calcium compounds contained in exhaust gases recovered from the above-mentioned factory facilities, construction sites, etc., and preferably can store them at least temporarily. For example, the type may be determined according to the properties of the carbon dioxide and calcium-containing substances contained in the exhaust gases to be received (for example, whether they are in powder, liquid, or gaseous form) and the transport machinery for these substances (vehicles such as dump trucks and tanker trucks; railways; ships such as bulk carriers).

[0047] A typical example of equipment included in the receiving facility is a receiving container (e.g., a receiving pit) for collectively receiving sludge-containing materials from various factory facilities and construction sites. The system of this embodiment may have one receiving container, or may have multiple receiving containers for different types of materials to be received or for different transport vehicles that transport the materials.

[0048] Furthermore, the location of the receiving facility may be on land, for example, when it is used to transport vehicles such as dump trucks and tanker trucks, or by land transport such as railways. When it is used to transport bulk ships and other sea transport, it may be located on the coast, and in this case, it may be equipped with a dedicated wharf.

[0049] [Intermediate facilities] The system of this embodiment has a storage facility, a classification facility, and a reaction facility as intermediate facilities. The intermediate facilities are facilities for treating and reacting at least one substance selected from carbon dioxide contained in exhaust gas and calcium-containing substances including calcium compounds, and are facilities for treating and reacting the substance received at the receiving facility so that it can be shipped as a product. The storage facility will be described below.

[0050] (Storage facilities) The storage facility is a facility for storing at least one substance selected from carbon dioxide contained in the exhaust gas and calcium-containing substances including calcium compounds.

[0051] Storage facilities not only store the above-mentioned materials, but can also adjust the amount of material received by temporarily or long-term storage when the amount is large, or by releasing the material stored in the storage facility when the amount is small. As mentioned above, calcium-containing materials such as ready-mixed concrete sludge and ready-mixed concrete sludge cake are calcium-containing waste materials that are generated primarily at ready-mixed concrete plants, precast concrete plants, and various other sites, such as construction sites. Since the amount generated is not constant but fluctuates, the amount received is also not constant but fluctuates. Storage facilities are capable of responding to such fluctuations in the amount received. Furthermore, storage facilities can also adjust the amount of material stored to select the necessary treatment according to the fluctuating demand for each use. Such adjustments make it possible to respond to changes in the amount of material generated, even though the amount of material generated at various factory facilities and construction sites is not constant, and also to respond to changes in supply volume according to demand for specific uses.

[0052] In the storage facility, the method for storing at least one substance selected from carbon dioxide contained in exhaust gas and calcium-containing substances including calcium compounds is not particularly limited as long as it is possible to store these substances, and may be carried out using, for example, a storage container (which may be of any type, such as a pit type, a tank type, or a vessel type).

[0053] It is preferable that storage containers be provided according to the type of material received at the receiving facility. When the above-mentioned means (1) is employed, it is preferable to employ a storage container for storing the carbon dioxide contained in the exhaust gas as exhaust gas or carbon dioxide, i.e., as a gas, and a storage container for storing the calcium-containing material as ready-mixed concrete sludge or ready-mixed concrete sludge cake, i.e., as a liquid (which may be a slurry) or a solid. When the above-mentioned means (2) is employed, it is preferable to employ a storage container for storing alkali metal carbonate, i.e., a liquid or solid electrolyte, for the carbon dioxide contained in the exhaust gas, and a storage container for storing ready-mixed concrete sludge, ready-mixed concrete sludge cake, etc., i.e., a liquid (which may be a slurry) or a solid, for the calcium-containing material. Also, when the above-mentioned means (3) is employed, it is preferable to employ a storage container for storing calcium carbonate, i.e., a solid electrolyte, for the carbon dioxide contained in the exhaust gas, and a storage container for storing ready-mixed concrete sludge, ready-mixed concrete sludge cake, calcium carbonate, etc., i.e., a liquid (which may be a slurry) or a solid, for the calcium-containing material.

[0054] Examples of materials to be stored in storage facilities include materials received at the receiving facility (hereinafter also referred to as "materials supplied from the receiving facility"), as shown in Figure 1, and materials supplied from intermediate facilities such as materials classified at the classification facility described below (hereinafter also referred to as "materials supplied from the classification facility"). As shown in Figure 1 as storage containers A to C, the substances (storage materials) stored in the storage facility can be shipped as products directly from the shipping facility (via storage container A), the reactant reacted in the reaction facility can be shipped as products from the shipping facility (via storage container B), and the prepared product prepared in the preparation facility can be shipped as products from the shipping facility (via storage container C).

[0055] When the storage facility has the storage container, the storage container may be single or multiple, and from the viewpoint of more efficient material processing and distribution, multiple storage containers are preferred, as shown in Figure 1. Furthermore, in the system of this embodiment, it is preferred that the storage facility has multiple storage containers, and that the materials received at the receiving facility are classified by the classification facility into multiple substance groups, each of which is stored in a separate storage container. This makes it possible to manage the materials to be reacted in the reaction facility, making it easier to carry out the reaction, and enabling decisions such as immediate shipping if the materials can be shipped without reaction, thereby enabling more efficient material processing and distribution.

[0056] Typical examples of storage containers in a storage facility include, as shown in FIG. 1, storage container A, which stores materials received at the receiving facility and ready for immediate shipment (supplies from the receiving facility), storage container B, which stores materials classified at the classification facility described below (supplies from the classification facility) and to be used for a reaction at the reaction facility, and storage container C, which stores materials classified at the classification facility (supplies from the classification facility) and to be used for a preparation facility described below.

[0057] (Classification equipment) The classification equipment is a facility that classifies materials according to their properties. By having the classification equipment, it is possible to manage the materials to be reacted in the reaction equipment, especially carbon dioxide contained in the exhaust gas recovered as alkali metal carbonates, and calcium-containing materials. Therefore, it is possible to decide whether to ship materials that are easy to react or can be shipped immediately without reaction, thereby enabling more efficient processing and distribution of sludge-containing materials.

[0058] The objects to be classified by the classification equipment include carbon dioxide and calcium-containing substances contained in the exhaust gas, which are substances received by the receiving equipment. The substances vary depending on which of the above means (1) to (3) is adopted as the receiving equipment, as explained above for the storage equipment. Therefore, the state of the objects to be classified can be any of gas, liquid, and solid states, and they can be classified according to any of these states.

[0059] The materials classified in the classification facility (supplies from the classification facility) may be shipped from the shipping facility as reactants obtained by reacting the materials stored in the storage facility in the reaction facility, or as prepared products in the preparation facility, as shown in Figure 1. Although not shown, the material supplied from the sorting facility may be shipped directly from the shipping facility without being stored in the storage facility, or may be shipped from the shipping facility as stockpiled material stored in the storage facility.

[0060] The properties of the substance that serve as classification criteria in the classification equipment are, for example, for calcium-containing substances, preferably sludge concentration, impurity type, and calcium content. In the system of this embodiment, it is preferable to classify according to at least one of these properties. When the above-mentioned means (3) is adopted in the receiving equipment for calcium-containing substances, it is preferable to classify according to properties such as the calcium carbonate concentration in the calcium-containing substance. Carbon dioxide contained in exhaust gas is preferably classified according to the concentration of carbon dioxide in the exhaust gas, and, when recovered as an alkali metal carbonate, according to properties such as the purity of the alkali metal carbonate and the concentration of an aqueous solution of the carbonate.

[0061] As described above, the materials received by the system of this embodiment may be waste materials discharged from the various factories and construction sites described above, and may contain impurities such as suspended solids, dust, and a wide variety of other impurities that are not calcium compounds. If the impurities contained in the materials to be received are known, more efficient material processing and distribution will be possible if materials containing the same types of impurities can be processed together in advance.

[0062] For example, when receiving calcium-containing materials with high and low sludge concentrations, it is possible to receive them together and store them in the same storage container. However, taking into account the type and properties of the product at the time of shipping, it may be possible to process and distribute the calcium-containing material more efficiently with a high or low sludge concentration. In this case, rather than storing the high and low sludge concentrations together in the same storage container, storing them separately and processing the calcium-containing material with the desired sludge concentration will enable more efficient processing and distribution of the material. The same applies to the other properties mentioned above.

[0063] In addition to the above, for example, if a calcium-containing material contains coarse particles such as aggregate, the properties of the coarse particles, such as the presence or absence of coarse particles and the particle size of the coarse particles, may be used as classification criteria. When multiple calcium-containing materials containing coarse particles of similar particle size are received, combining them facilitates processes such as impurity removal, which can be performed as needed, thereby enabling more efficient material processing and distribution. Note that the coarse aggregate may include both coarse aggregate and fine aggregate. When calcium-containing materials containing coarse and fine aggregate are received at a receiving facility and impurities are removed as needed, the coarse aggregate is primarily removed, and the properties of the fine aggregate are used as classification criteria. Furthermore, when impurity removal is not performed and the material is sorted directly in a sorting facility, both coarse and fine aggregate are present, and the properties of either of these may be used as classification criteria.

[0064] If the properties of the material to be received are known at the time of receiving, then they should be followed. If they are unknown, then a portion of the material should be sampled at the time of receiving at the receiving facility, for example, when it is received into a receiving container, and an analysis of one of the above properties should be carried out.

[0065] (Reaction equipment) A reaction facility is a facility where a reaction of substances takes place. The reaction carried out in the reaction facility can be appropriately selected depending on the type of substance, and preferred examples include the above-mentioned reactions 1 and 2. Reactions 1 and 2 are preferably carried out when the receiving facility receives exhaust gas containing carbon dioxide (when the above-mentioned means (1) is employed in the recovery facility) or when a calcium-containing substance is received.

[0066] When sodium carbonate is received at the receiving facility (when the above-mentioned method (2) is adopted at the recovery facility), the following reaction 3 may occur. Depending on the calcium compounds contained in the calcium-containing material, the above-mentioned reaction 2 may also occur. Reaction 3: M A2 CO3 + Ca(OH)2 → CaCO3 + 2M A OH In the above reaction 3, M A indicates an alkali metal ion.

[0067] When the above reaction 3 occurs, the obtained alkali metal hydroxide may be stored, for example, in a storage container of a storage facility, and used in the above reaction 1. When the above reactions 1 and 2 occur, the alkali metal hydroxide obtained in reaction 2 can also be stored, for example, in a storage container of a storage facility, and used in the above reaction 3. When an alkali metal hydroxide is obtained in reactions 2 and 3, it can be stored in a carbon dioxide capture tower based on measures (2) and (3), and loaded onto the above transportation machinery for use. That is, the alkali metal hydroxide produced in the reaction apparatus (more specifically, the alkali metal hydroxide obtained in the above reactions 2 and 3) can be used as the aqueous alkali metal hydroxide solution used in measures (2) and (3). In this way, the system of this embodiment can respond appropriately depending on the type of material received at the receiving facility.

[0068] When calcium carbonate is received at the receiving facility (when the above-mentioned means (3) is employed in the recovery facility), the calcium carbonate can be shipped from the shipping facility as it is or after being stored in a storage facility, or when the reactions 1 and 2 in the carbon dioxide recovery tower have not progressed sufficiently, at least one reaction selected from the above-mentioned reactions 2 and 3 can be carried out in the reaction facility to produce more homogeneous calcium carbonate, which can then be shipped from the shipping facility.

[0069] Calcium carbonate, as will be described in detail below, can be suitably used for applications such as cement raw material, solidification raw material, building material, resin raw material, and rubber raw material. When used for these applications, obtaining mass balance certification for calcium carbonate makes it possible to contribute to carbon neutrality according to the amount of calcium carbonate used obtained by the system of this embodiment. In this way, the system of this embodiment not only enables smooth processing and distribution of sludge-containing materials, but also enables the fixation of carbon dioxide while producing valuable materials such as calcium carbonate.

[0070] The method for reacting a calcium-containing substance with carbon dioxide in a reaction facility is not particularly limited as long as the reaction proceeds. Representative examples include a method of supplying a gas containing carbon dioxide to a calcium-containing substance (liquid state) by bubbling or the like, and a method of supplying a calcium-containing substance (liquid state) by spraying it into a gas stream containing carbon dioxide while circulating the gas. Alternatively, the reaction can be carried out using, for example, the carbon dioxide recovery tower of the above means (3).

[0071] Furthermore, when using fresh concrete sludge water as the calcium-containing material, since the fresh concrete sludge water contains dissolved calcium components such as calcium hydroxide, the sludge water may be concentrated to precipitate calcium components such as calcium hydroxide before the reaction. In other words, the reaction facility may have a concentration device in addition to the reaction device for carrying out the above reaction.

[0072] It is preferable that the calcium-containing material to be supplied to the reaction equipment has few impurities and a high sludge concentration and calcium concentration. This is because the reaction between the sludge-containing material and carbon dioxide in the reaction equipment is facilitated. Therefore, impurities may be removed as necessary.

[0073] Regarding a method for supplying a calcium-containing material to a reaction facility, for example, as shown in Fig. 1, a calcium-containing material having properties such as a small amount of impurities and a high sludge concentration and calcium concentration can be sorted in a classification facility and stored in a storage container B for storing the calcium-containing material to be supplied to the reaction facility, and then supplied to the reaction facility. Furthermore, before supplying the calcium-containing material from the storage container B to the reaction facility, solid-liquid separation can be performed as necessary, and the obtained solid content can be supplied to the reaction facility.

[0074] 1, when a calcium-containing material with a high impurity content is to be supplied to a reaction facility, the impurities may be removed from the calcium-containing material with a high impurity content as needed, and the calcium-containing material from which the impurities have been removed may be supplied to the reaction facility via a storage container B that stores the calcium-containing material, or solids may be separated from the storage container B as needed, and the solids may be supplied to the reaction facility. In this way, the system of this embodiment may include an impurity removal facility that removes impurities from a substance as needed, and a solid-liquid separation facility that performs solid-liquid separation.

[0075] The equipment used in the impurity removal equipment may be appropriately selected depending on the impurities to be removed, and may include various sieves such as a trommel (rotary sieve), a vibrating sieve, an inclined sieve, etc. The equipment used in the solid-liquid separation equipment may be appropriately selected depending on the solid and liquid components to be separated, and may include a dehydrator such as a filter press, a filtration device, etc.

[0076] Furthermore, when carrying out the above reactions 1 to 3, if there is a shortage of carbon dioxide and a calcium-containing substance, the carbon dioxide and the calcium-containing substance can be procured from the factory equipment having the system of this embodiment.

[0077] [Preparation equipment, etc.] In addition to the receiving facility and intermediate facility, the system of this embodiment further includes: a product preparation material receiving facility for receiving the product preparation materials; a storage facility for the ingredients for preparing the product; and equipment for preparing a preparation comprising said substance and said product preparation ingredients; It is preferable to have:

[0078] The receiving equipment for materials for product preparation is equipment that receives materials for product preparation, and more specifically, as shown in FIG. 1, is equipment that collects and receives waste materials such as concrete rubble (concrete debris generated during construction and demolition work) discarded from factory facilities, construction sites, etc. Waste materials such as concrete rubble can be collected using, for example, transport machinery that can be used in the recovery equipment for the above-mentioned materials. Furthermore, before collection, waste materials such as concrete rubble can be crushed and classified at a recycled crusher plant, and foreign objects such as rebar can be removed as necessary. The recycled crushed stone (RC40, etc.) can then be collected and received at the receiving equipment.

[0079] The storage facility for product preparation materials is a facility for storing the product preparation materials received at the receiving facility. There are no particular limitations on the method for storing the product preparation materials in the storage facility as long as the product preparation materials can be stored, and for example, storage containers (which may be of any type, such as pit type, tank type, or vessel type) may be used. When storing the recycled crushed stone, it is preferable to use pit type storage containers.

[0080] The preparation facility is a facility for preparing a prepared product containing the product preparation materials and substances received at the receiving facility. The preparation facility includes at least a device for mixing the product preparation materials and substances.

[0081] FIG. 1 shows that the material supplied from storage container C is used in the preparation facility. When the prepared product prepared in the preparation facility is an asphalt material, the material for preparing the product supplied from storage container C is mainly calcium carbonate. Calcium carbonate is used as a filler. Furthermore, recycled crushed stone (RC40, etc.) is preferably used as aggregate as the material for preparing the product received by the receiving facility. In addition to these product preparation materials, asphaltene and other product preparation materials can be mixed using a uniform mixing device to prepare asphalt. The resulting asphalt can be effectively used as a roadbed material with immobilized carbon dioxide.

[0082] When the system of this embodiment is equipped with equipment for receiving the above-mentioned product preparation materials, storage equipment for the product preparation materials, and equipment for preparing prepared products containing substances and the product preparation materials, the prepared products obtained in the preparation equipment can be shipped as products according to their intended use by shipping equipment.

[0083] [Shipping equipment] The shipping facility is a facility that ships the supplies from the receiving facility and the intermediate facility as products according to their intended use. By including the receiving facility and the shipping facility, the system of the present embodiment can efficiently recover and distribute carbon dioxide and calcium compounds.

[0084] As shown in Figure 1, products shipped from the shipping facility include a feed (received product) from a receiving facility, and among feeds from intermediate facilities, a feed (storage product) from a storage facility, a feed (reactant) from a reaction facility, a feed (concentrate) concentrated in a reaction facility, and a feed (prepared product) from a preparation facility. Also included, although not shown, is a feed (classified product) from a classification facility. Furthermore, these feeds may be a feed (impurity-removed product) from an impurity removal facility from which impurities have been removed as needed, or a feed (solid-liquid separated product, which is a solid and / or liquid fraction) from a solid-liquid separation facility from which solid-liquid separation has been performed.

[0085] Examples of products shipped from the system of this embodiment include calcium carbonate (for example, supplied as the above-mentioned received material, stored material, reacted material, classified material, impurity-removed material, or solid-liquid separated material); alkali metal hydroxide or an aqueous solution thereof (for example, supplied as the above-mentioned received material, stored material, reacted material, classified material, impurity-removed material, or solid-liquid separated material); aggregates such as coarse aggregate and fine aggregate contained in the calcium-containing material and mortar components (for example, supplied as the above-mentioned received material, stored material, classified material, impurity-removed material, or solid-liquid separated material); ready-mixed concrete sludge or ready-mixed concrete sludge water (for example, supplied as the above-mentioned received material, stored material, classified material, impurity-removed material, or solid-liquid separated material); calcium components such as calcium hydroxide obtained by concentrating ready-mixed concrete sludge water (for example, supplied as the above-mentioned concentrate); and the like.

[0086] When the calcium-containing material shipped from the shipping facility is a supply from a solid-liquid separation facility, at least one of the solid content and the liquid content obtained by solid-liquid separation can be shipped. When the calcium-containing material is fresh concrete sludge water containing coarse particles such as aggregate, the coarse particles such as aggregate correspond to the solid content, and the fresh concrete sludge water from which the coarse particles have been removed (the supernatant water in which calcium components such as calcium hydroxide have been dissolved) corresponds to the liquid content. The solid content may also contain impurities such as suspended solids, but if the received calcium-containing material contains a large amount of impurities, these may be removed in impurity removal equipment as necessary.

[0087] In addition, calcium-containing materials shipped from the shipping facility include calcium hydroxide and other calcium components obtained by concentrating sludge water (which may contain coarse particles such as aggregate) obtained by removing coarse particles such as aggregate. This sludge water is the supernatant water in which calcium components such as calcium hydroxide are dissolved. This is the case when the calcium-containing material received at the receiving facility is fresh concrete sludge water (which may contain coarse particles such as aggregate).

[0088] Among the calcium-containing materials shipped from the shipping facility, the calcium content such as calcium hydroxide contained in the fresh concrete sludge water can be used, for example, as a carbonate raw material, a cement raw material, a solidification material raw material, a papermaking raw material, a resin raw material, and a rubber raw material, as well as a material (secondary material, etc.) for concrete, mortar, and asphalt.

[0089] The calcium-containing materials such as the above-mentioned ready-mixed concrete sludge water can be shipped as calcium hydroxide or other calcium components to ready-mixed concrete plants and cement plants as cement raw materials, solidification raw materials, building materials, etc., or can be shipped to paper mills, resin manufacturing plants, and rubber manufacturing plants as secondary materials (e.g., usable as a chemical agent when recovering caustic soda from sodium carbonate discharged during pulp production), resin raw materials (e.g., usable as a flame retardant, antibacterial agent, deodorizer, toxic gas capture agent, etc.), and rubber raw materials (e.g., usable as an acid acceptor for fluororubber, etc.). Furthermore, high-quality sludge water with a low impurity content is particularly useful as a raw material or secondary material in paper mills, resin manufacturing plants, rubber manufacturing plants, etc., among the above. Depending on the needs of these factories, the sludge may be shipped as ready-mixed concrete sludge water or as a powder of calcium such as calcium hydroxide.

[0090] When the product shipped from the shipping facility is a supply from a reaction facility among the intermediate facilities, the supply (reactant) from the reaction facility can be calcium carbonate, which is a reactant obtained in the reaction facility. Applications of the reactants such as calcium carbonate shipped from the shipping facility can be carbonate raw materials, cement raw materials, solidification material raw materials, papermaking raw materials, resin raw materials, rubber raw materials, or auxiliary materials. For example, calcium carbonate can be shipped as a carbonate raw material, a cement raw material (e.g., cement composition), a solidifying agent raw material, or a building material. It can also be shipped to paper mills, resin manufacturing plants, and rubber manufacturing plants as a papermaking raw material (e.g., filler, flocculation aid, retention agent, etc.), a resin raw material (additive for improving various properties such as impact resistance, dimensional stability, and surface smoothness), or a rubber raw material (rubber filler for improving heat resistance, strength, and processability). Calcium carbonate can also be shipped as various materials (secondary materials) such as fillers used in mortar, concrete, asphalt, etc. (also referred to as mortar material, concrete material, and asphalt material, respectively). The use of calcium carbonate in asphalt materials is as explained above in the preparation equipment section.

[0091] When the product shipped from the shipping facility is a supply from a reaction facility among the intermediate facilities, the supply (reactant) from the reaction facility also includes an alkali metal hydroxide or an aqueous solution thereof, which is a reactant obtained in the reaction facility. The alkali metal hydroxide or its aqueous solution can be used, for example, in the carbon dioxide capture tower employed in the means (2) and (3) in the above-mentioned capture facility. In this case, the transport machine employed in the capture facility and the transport machine employed in the shipping facility can be shared. That is, the transport machine loaded with the alkali metal hydroxide or its aqueous solution shipped from the shipping facility can be used to capture at least one substance selected from carbon dioxide and calcium-containing substances, including calcium compounds, contained in exhaust gas generated at at least one factory facility and construction site.

[0092] Products shipped from the shipping facility include feed (prepared product) from the preparation facility. As described above for the preparation facility, the prepared product includes asphalt. As calcium carbonate used as a filler for asphalt, feed from the reaction facility can be preferably used. Asphalt is suitable for use as a roadbed material, and the system of this embodiment allows for effective use of asphalt as a roadbed material in which carbon dioxide is fixed.

[0093] Products shipped from the shipping facility also include aggregates such as coarse aggregate and fine aggregate. Aggregates may be contained in the calcium-containing material and are supplied from the impurity removal equipment and solid-liquid separation equipment that may be employed as needed. For example, in the impurity removal equipment, aggregate is obtained by removing aggregate as an impurity from a sludge-containing material containing aggregate. In addition, in the solid-liquid separation equipment, aggregate is obtained by separating aggregate as a solid content from a sludge-containing material containing aggregate. Here, if the calcium-containing material contains, in addition to aggregate, for example, mortar, the aggregate and mortar content are obtained as solid content by solid-liquid separation. The aggregate obtained from these facilities can be used as various materials (secondary materials) such as mortar materials, concrete materials, asphalt materials, etc., similar to the calcium carbonate described above. In addition, when a mortar component is obtained, the mortar component can be used as a mortar raw material or a concrete raw material.

[0094] The shipping facility may also include a product storage facility. By having a product storage facility for temporary or long-term storage of products before shipping, it becomes easier to respond to changes in the amount of product generated and even fluctuations in shipping volume.

[0095] There are no particular restrictions on the type of product storage facility as long as it is capable of storing products temporarily or long-term before shipping, but it is advisable to use, for example, a product storage container (which may be any type such as a pit type, tank type, tank type, or silo type).

[0096] Furthermore, when the product storage facility has the above-mentioned product storage container, the product storage container may be singular or plural, and plural product storage containers are preferable from the viewpoint of more efficient treatment and distribution of carbon dioxide and calcium compounds. When plural product storage containers are used, the product storage containers can be provided according to the properties of the products, for example, it is advisable to provide plural product storage containers according to differences in properties such as gas, liquid, or solid, or differences in product purity. More efficient shipping is possible, and therefore more efficient treatment and distribution of carbon dioxide and calcium compounds is possible.

[0097] The shipping facility is not particularly limited in type, etc., as long as it can ship the supplies from each of the above-mentioned facilities as products according to their intended use. For example, the shipping facility may be of a type that corresponds to the means of transporting the sludge-containing material and reactants for shipping (for example, vehicles such as dump trucks and tanker trucks, railways, or ships such as bulk carriers). For example, when handling vehicles such as dump trucks and tanker trucks, or land transport means such as railways, the receiving facilities should be located on land. When handling sea transport means such as bulk ships, the receiving facilities should be located on the coast, and in this case, a dedicated wharf should be provided.

[0098] The transportation means for shipping the products from the shipping facility according to their intended use can be any of the transportation machines that can be used in the means (1) to (3) in the recovery facility, i.e., vehicles such as dump trucks and tanker trucks; railways; ships such as bulk carriers; etc.

[0099] For example, when the product shipped from the shipping facility is an alkali metal hydroxide or an aqueous solution thereof, as described above, the transport machine employed in the recovery facility and the transport machine employed in the shipping facility can be shared. In this way, the system of this embodiment is equipped with everything from recovery equipment to shipping equipment, and can centrally manage all of the processing and logistics of carbon dioxide contained in exhaust gas and calcium-containing materials, including calcium compounds, thereby enabling more efficient processing and logistics.

Claims

1. a material recovery facility for recovering at least one substance selected from carbon dioxide and calcium-containing substances including calcium compounds contained in exhaust gases generated in at least one factory facility and construction site; a receiving facility for receiving said material; storage facilities for said substances; a sorting facility for sorting the materials according to their properties; and an intermediate facility having a reaction facility for carrying out the reaction of the substances; a shipping facility that ships the supplies from the receiving facility or the intermediate facility as products according to their intended use; A carbon dioxide and calcium compound recovery and distribution system comprising:

2. Further, a product preparation material receiving facility for receiving the product preparation materials; a storage facility for the ingredients for preparing the product; and equipment for preparing a preparation comprising said substance and said product preparation ingredients; Equipped with 2. The carbon dioxide and calcium compound recovery and distribution system according to claim 1, wherein the shipping facility ships the prepared product as a product for each use.

3. 3. The system for recovering and distributing carbon dioxide and calcium compounds according to claim 1, wherein the calcium-containing material is calcium-containing waste.

4. 3. The system for recovering and distributing carbon dioxide and calcium compounds according to claim 1 or 2, wherein the recovery of the substances is carried out using at least one of the following means (1) to (3): Means (1) A transport means for loading the substance Means (2) A transport means for carrying a carbon dioxide absorption tower having an inlet for the exhaust gas and an outlet for the exhaust gas, and storing an aqueous solution of an alkali metal hydroxide. Means (3) A transport means for loading a carbon dioxide absorption tower, the transport means having a carbon dioxide recovery tower equipped with a supply port for an alkali metal-containing aqueous solution, a screen, and a supply port for an exhaust gas containing carbon dioxide, the supply port for the aqueous solution being provided in an upper part of the carbon dioxide recovery tower, the supply port for the exhaust gas being provided in a lower part of the carbon dioxide absorption tower, the screen being provided between the supply port for the aqueous solution and the supply port for the exhaust gas, and a calcium-containing material being placed on the screen.

5. 5. The system for recovering and distributing carbon dioxide and calcium compounds according to claim 4, wherein the calcium-containing material in the means (3) is selected from calcium-containing waste and calcium-containing minerals.

6. 5. The system for recovering and distributing carbon dioxide and calcium compounds according to claim 4, wherein the aqueous solution of alkali metal hydroxide in the means (3) is produced in the reaction facility.

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