System and method for recycling carbon dioxide

Abstract

Disclosed are a system and a method for recycling carbon dioxide. A system for recycling carbon dioxide according to one aspect of the present invention comprises: a main reactor which is supplied with a first reaction solution in which a metal compound is dissolved and a first reaction gas containing carbon dioxide, and in which a reaction product in the form of a slurry and including a carbonate compound produced by a carbonation reaction between metal ions in the first reaction solution and carbon dioxide in the first reaction gas is produced; and a centrifuge for separating the reaction product discharged from the main reactor into a solid carbonate compound and a liquid.

Description

Carbon dioxide resource recovery system and method

[0001] The present invention relates to a carbon dioxide resource system and method.

[0002] With global warming accelerating, research is actively underway on systems for efficiently converting carbon dioxide. Among these, technologies for converting carbon dioxide into useful substances such as carbonate compounds are attracting particular attention because they can simultaneously achieve the dual benefits of carbon dioxide capture and product production.

[0003] However, conventional technologies require the development of more efficient technologies because they involve large facilities, complex processes, or the addition of catalysts for the conversion of carbon dioxide, or the purity of the products is low.

[0004] The present invention is intended to solve the above problems, and an object of the present invention is to provide a carbon dioxide resource system and method configured to effectively convert carbon dioxide into a carbonate compound and resource it.

[0005] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the description below.

[0006] According to one aspect of the present invention, a carbon dioxide resource system is provided, comprising: a main reactor which receives a first reaction solution containing a dissolved metal compound and a first reaction gas containing carbon dioxide, and produces a slurry-type reaction product including a carbonate compound produced by a carbonation reaction between metal ions of the first reaction solution and carbon dioxide of the first reaction gas; and a centrifuge which separates the reaction product discharged from the main reactor into a solid carbonate compound and a liquid.

[0007] At this time, the carbon dioxide resource system may further include a dryer for drying the solid carbonate compound separated through a centrifuge.

[0008] At this time, the carbon dioxide resource system may further include a pulverizer that pulverizes the carbonate compound dried in the dryer.

[0009] Meanwhile, the chemical formula of the metal compound is Ma(OH)b or MaCO3, M is a metal, and a and b may be 1 or 2, respectively.

[0010] At this time, the metal compound may be any one of Ca(OH)2, Mg(OH)2, and Na2CO3.

[0011] Meanwhile, when the acidity (PH) of the contents within the main reactor reaches the first set value, the reaction product from the main reactor can be discharged to the centrifuge.

[0012] Meanwhile, the carbon dioxide resource system may further include a stirrer for stirring the contents within the main reactor.

[0013] Meanwhile, the agitator may include a stirring shaft at least partly disposed within the main exchanger; at least one stirring blade formed on an outer surface of the stirring shaft within the main reactor; and a driving motor providing a driving force for rotating the stirring shaft.

[0014] At this time, the stirring shaft has a hollow shape, and the first reaction gas can be introduced into the main reactor through the hollow portion of the stirring shaft.

[0015] At this time, at least one gas discharge member that disperses and discharges the first reaction gas moving through the stirring shaft within the main reactor may be combined with the stirring shaft.

[0016] Meanwhile, the carbon dioxide resource system may further include a solution supply tank for storing the first reaction solution supplied to the main reactor.

[0017] Meanwhile, the carbon dioxide resource system further includes an auxiliary reactor that receives a second reaction solution in which the metal compound is dissolved and a second reaction gas containing carbon dioxide, and produces an auxiliary reaction product including a carbonate compound produced by a carbonation reaction of a portion of the metal ions of the second reaction solution, and the acid auxiliary reaction product is an unsaturated solution for the carbonated compound produced in the auxiliary reactor, and the auxiliary reaction product can be introduced into the main reactor and used as the first reaction solution.

[0018] At this time, a portion of the first reaction gas introduced into the main reactor may be introduced into the auxiliary reactor and used as the second reaction gas.

[0019] Meanwhile, when the acidity (PH) of the auxiliary reaction product within the auxiliary reactor reaches the second set value, the auxiliary reaction product can be discharged from the auxiliary reactor to the main reactor.

[0020] Meanwhile, the second reaction solution and the second reaction gas can be supplied to the auxiliary reactor in a mixed state from outside the auxiliary reactor.

[0021] According to another aspect of the present invention, a method for recycling carbon dioxide is provided, comprising: (a) supplying a first reaction gas containing carbon dioxide and a first reaction solution in which a metal compound is dissolved to a main reactor; (b) generating a slurry-type reaction product including a carbonate compound produced by a carbonation reaction between the carbon dioxide of the first reaction gas and the metal ion of the first reaction solution in the main reactor; and (c) separating the reaction product into a solid carbonate compound and a liquid in a centrifuge.

[0022] At this time, the carbon dioxide resource conversion method may further include (d) a step of drying the solid carbonate compound in a dryer; (e) a step of pulverizing the dried carbonate compound in a crusher; and (f) a sieving step of separating the pulverized carbonate compound by size in a sieving machine.

[0023] Meanwhile, the method for recycling carbon dioxide may further include, before step (a), (p) a step of supplying a second reaction gas containing carbon dioxide and a second reaction solution in which the metal compound is dissolved to an auxiliary reactor; (q) a step of generating an auxiliary reaction product including a carbonate compound generated by a carbon dioxide of the second reaction gas and a portion of the metal ions of the second reaction solution undergoing a carbonation reaction in the auxiliary reactor; and (r) a step of transporting the auxiliary reaction product to the main reactor to be used as the first reaction solution.

[0024] At this time, a portion of the first reaction gas introduced into the main reactor may be introduced into the auxiliary reactor and used as the second reaction gas.

[0025] Meanwhile, the chemical formula of the metal compound is Ma(OH)b or MaCO3, M is a metal, and a and b may be 1 or 2, respectively.

[0026] At this time, the metal compound may be any one of Ca(OH)2, Mg(OH)2, and Na2CO3.

[0027] According to the above configuration, the carbon dioxide resource system according to one aspect of the present invention generates a slurry-type reaction product containing a carbonate compound using carbon dioxide of the first reaction gas in the main reactor, and operates to transfer the generated reaction product to a centrifuge to separate a solid-type carbonate compound, thereby easily and effectively converting the carbon dioxide of the first reaction gas into a solid-type carbonate compound and reusing it as a resource.

[0028] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the composition of the invention described in the claims.

[0029] FIG. 1 is a schematic diagram showing a carbon dioxide resource system according to one embodiment of the present invention.

[0030] Figure 2 is an enlarged view of the interior of part A of Figure 1.

[0031] FIG. 3 is a drawing showing a carbon dioxide resource system according to another embodiment of the present invention.

[0032] Figure 4 is a drawing showing an enlarged portion of part B of Figure 3 cut away from the portion.

[0033] Figure 5 is an enlarged view of part C of Figure 3.

[0034] FIG. 6 is a drawing showing a carbon dioxide resource system according to another embodiment of the present invention.

[0035] FIG. 7 is a drawing showing a carbon dioxide resource system according to another embodiment of the present invention.

[0036] FIG. 8 is a drawing illustrating a carbon dioxide resource system according to another embodiment of the present invention.

[0037] Figure 9 is a flowchart of a carbon dioxide resource recovery method according to one embodiment of the present invention.

[0038] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts irrelevant to the description are omitted in the drawings, and the same reference numerals designate identical or similar components throughout the specification.

[0039] The words and terms used in this specification and claims should not be construed as limited to their ordinary or dictionary meanings, but should be interpreted in a way that is consistent with the technical idea of ​​the present invention, in accordance with the principles by which the inventor can define terms and concepts in order to best explain his or her invention.

[0040] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings correspond to a preferred embodiment of the present invention, and do not represent all of the technical ideas of the present invention, so there may be various equivalents and modified examples that can replace the configuration at the time of filing of the present invention.

[0041] In this specification, terms such as “include” or “have” are intended to describe the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0042] When a component is said to be "in front of," "behind," "above," or "below" another component, this includes not only being placed "in front of," "behind," "above," or "below" the other component in direct contact with it, but also if there is another component intervening therebetween. Furthermore, when a component is said to be "connected" to another component, this includes not only being directly connected to one another, but also being indirectly connected to one another, unless there are special circumstances.

[0043] FIG. 1 is a schematic drawing of a carbon dioxide resource system according to one embodiment of the present invention, and FIG. 2 is an enlarged drawing of the interior of part A of FIG. 1.

[0044] Referring to FIG. 1, the carbon dioxide resource system (10) according to the present embodiment may include a main reactor (100) and a centrifuge (200).

[0045] The main reactor (100) has a hollow tank shape.

[0046] A first reaction gas containing carbon dioxide and a first reaction solution containing a dissolved metal compound are introduced into the main reactor (100). Here, the first reaction solution is a concept including a solvent and a solute, and the solute is a metal compound.

[0047] In one embodiment of the present invention, the first reaction solution may be directly introduced from a solution supply tank (50). The solvent and solute may be supplied to the solution supply tank (50) periodically or non-periodically.

[0048] The solution supply tank (50) is connected to the main reactor (100) by a solution transfer line (51). A valve (not shown) may be installed in the solution transfer line (51). The valve may be operated to control the amount of the first reaction solution transferred through the solution transfer line (51).

[0049] The valve (not shown) formed in the solution transfer line (51) can be opened and closed manually or automatically.

[0050] The first reaction solution can be transferred from the solution supply tank (50) to the main reactor (100) by known means such as a pump (not shown).

[0051] The first reaction gas is a gas containing carbon dioxide and is supplied from the outside into the main reactor (100) through a gas supply line (41). The gas supply line (41) connects the main reactor (100) and a gas supply source (40).

[0052] The first reactant gas is a gas containing carbon dioxide.

[0053] For example, the first reaction gas may be a gas comprising 10% to 99% carbon dioxide. Alternatively, the first reaction gas may be composed entirely of carbon dioxide. However, the concentration of carbon dioxide contained in the first reaction gas is merely exemplary.

[0054] In one embodiment of the present invention, the gas supply source (40) may be a device or facility that emits carbon dioxide in various industrial sites.

[0055] For example, the gas supply source (40) may include a power plant, an incinerator, a factory, etc. In this case, the gas discharged from the power plant, incinerator, factory, etc. may become the first reaction gas containing carbon dioxide.

[0056] In this case, carbon dioxide contained in exhaust gases emitted from power plants, incinerators, and factories, which are recognized as the main culprits of global warming, can be recycled, thereby reducing global warming, etc.

[0057] A valve (not shown) for opening and closing the gas supply line (41) may be installed on the gas supply line (41). The first reaction gas may be transferred from a gas supply source (40) to the main reactor (100) by a known means such as a pump.

[0058] The gas supply line (41) may be extended into the main reactor (100). At this time, the end of the gas supply line (41) may be located at the lower portion of the internal space of the main reactor (100). In this case, since the first reaction gas is discharged from the lower portion of the internal space of the main reactor (100), the contact time and contact area with the first reaction solution introduced into the main reactor (100) increase, thereby promoting the carbonation reaction.

[0059] Furthermore, micro-holes may be formed in the portion of the gas supply line (41) located within the main reactor (100). In this case, the first reaction gas may be discharged in the form of micro-bubbles through the micro-holes. In particular, when the micro-holes are formed at the end of the gas supply line (41), the first reaction gas is discharged in the form of micro-bubbles from the lower portion of the internal space of the main reactor (100), thereby significantly promoting the carbonation reaction.

[0060] In this embodiment, the metal compound is M a (OH) b or M a It may have a chemical formula such as CO3, wherein M is a metal, and a and b are each 1 or 2.

[0061] For example, the metal compound may be Na2CO3, Ca(OH)2, or Mg(OH)2.

[0062] In this embodiment, the solvent in which the metal compound is dissolved may be water. In this case, the reaction solution flowing into the main reactor (100) becomes an aqueous solution.

[0063] In the main reactor (100), carbon dioxide contained in the first reaction gas and metal ions of the first reaction solution meet to cause a carbonation reaction. More specifically, the carbonation reaction is a reaction in which carbon dioxide contained in the first reaction gas dissolves in a solvent to produce bicarbonate ions or carbonate ions, and the produced bicarbonate ions or carbonate ions react with metal ions contained in the first reaction solution to produce a carbonate compound.

[0064] For example, when the first reaction solution flowing into the main reactor (100) is a Ca(OH)2 aqueous solution, the carbonation reaction may be Ca(OH)2+ CO2-> CaCO3+ H2O.

[0065] As another example, when the first reaction solution flowing into the main reactor (100) is an aqueous Mg(OH)2 solution, the carbonation reaction may be Mg(OH)2+ 2CO2-> Mg(HCO3)2-> MgCO3+ CO2+ H2O.

[0066] As another example, if the first reaction solution flowing into the main reactor (100) is a Na2CO3 aqueous solution, the carbonation reaction may be Na2CO3+CO2+H2O -> 2NaHCO3.

[0067] While the carbonation reaction is in progress in the main reactor (100), the metal compound contained in the first reaction solution introduced into the main reactor (100) gradually decreases and the newly generated carbonate compound gradually increases.

[0068] In this case, the first reaction solution in the main reactor (100) changes into a solution having different components.

[0069] For example, a carbonate compound produced by a carbonation reaction is dissolved in a solution inside the main reactor (100).

[0070] Until a predetermined time has elapsed, the solution inside the main reactor (100) is an unsaturated solution with respect to the carbonate compound.

[0071] After a certain amount of time has elapsed, the solution inside the main reactor (100) becomes a saturated solution with respect to the carbonate compound.

[0072] After the solution in the main reactor (100) becomes a saturated solution for the carbonate compound, the carbonate compound produced is not dissolved in the solution but precipitates. At this time, a slurry-type reaction product is produced in the main reactor (100) in which the saturated solution for the carbonate compound and the solid carbonate compound are mixed.

[0073] In one embodiment of the present invention, the reaction product in the form of a slurry is discharged from the main reactor (100) and introduced into a centrifuge (200).

[0074] In one embodiment of the present invention, the centrifuge (200) separates the reaction product into a solid carbonate compound and a liquid. Here, the liquid is a saturated solution of the carbonate compound.

[0075] A reaction product transfer line (101) for transferring the reaction product may be interposed between the main reactor (100) and the centrifuge (200).

[0076] A valve (not shown) for opening and closing the reaction result transfer line (101) may be installed in the reaction result transfer line (101). The valve may be opened and closed manually by an operator or automatically by a control unit (not shown).

[0077] In one embodiment of the present invention, the reaction product within the main reactor (100) may be moved from the main reactor (100) to the centrifuge (200) by gravity. At this time, the reaction product outlet formed in the main reactor (100) may be located above the reaction product inlet of the centrifuge.

[0078] Alternatively, the reaction product can be transferred to the centrifuge (200) by the difference in internal pressure between the main reactor (100) and the centrifuge (200).

[0079] Alternatively, the reaction product may be transferred from the main reactor (100) to the centrifuge (200) by known means such as a pump.

[0080] The carbonate compound separated from the reaction product by the centrifuge (200) can be collected from the centrifuge (200), processed, and used as a resource.

[0081] Meanwhile, the liquid separated from the reaction product by the centrifuge (200), i.e., the saturated solution for the carbonate compound, can be recovered to the solution supply tank (50) and reused. For this purpose, a recovery line (105) can be interposed between the centrifuge (200) and the solution supply tank (50).

[0082] The liquid separated from the reaction product by the centrifuge (200) can be recovered to the solution supply tank (50) through the recovery line (105) and reused.

[0083] A valve (not shown) for opening and closing the recovery line (105) may be installed in the recovery line (105).

[0084] The liquid separated by the centrifuge (200) can be recovered to the solution supply tank (50) by a known means such as a pump (not shown).

[0085] A carbon dioxide resource system (10) according to one embodiment of the present invention may further include a dryer (310). The dryer (310) dries the solid carbonate compound separated from the centrifuge (200).

[0086] For example, a solid carbonate compound discharged from a centrifuge (200) has a moisture content of approximately 5%. The introduced solid carbonate compound is dried in a dryer (310) to become a dried carbonate compound. At this time, the dried carbonate compound may have a moisture content of approximately 0.25% or less.

[0087] In one embodiment of the present invention, the carbonate compound separated from the reaction product in the centrifuge (200) can be moved to the dryer (310) by the transport device (201). For example, the transport device (201) can include a conveyor device arranged between the dryer (310) and the centrifuge (200). In addition, various types of transport devices can be proposed.

[0088] Alternatively, the carbonate compound separated from the reaction product in the centrifuge (200) can be transferred to a dryer (310) manually or semi-automatically by an operator.

[0089] The carbonate compound dried by the dryer (310) can be collected, processed, and used as a resource.

[0090] A carbon dioxide resource system (10) according to one embodiment of the present invention may further include a crusher (330). The crusher (330) crushes the carbonate compound dried in the dryer (310).

[0091] Carbonate compounds crushed by the crusher (330) can be collected, processed, and used as resources.

[0092] In one embodiment of the present invention, the carbonate compound dried in the dryer (310) may be transferred to the crusher (330) by a transfer device (311). For example, the transfer device (311) may include a conveyor device positioned between the dryer (310) and the crusher (330). Other types of transfer devices may be proposed.

[0093] Alternatively, the carbonate compound dried in the dryer (310) can be transferred to the crusher (330) manually or semi-automatically by an operator.

[0094] The carbon dioxide resource system (10) according to one embodiment of the present invention may further include a sieving machine (350). The sieving machine (350) receives the carbonate compound pulverized by the crusher (330) and separates it according to size. For example, the sieving machine (350) may separate the pulverized carbonate compound into carbonate compound powder having a size below a predetermined value and carbonate compound powder having a size exceeding the predetermined value.

[0095] At this time, carbonate compounds having a size below a predetermined value can be collected and used as a resource. In addition, carbonate compound powder exceeding the predetermined value can also be post-processed and used as a resource.

[0096] In one embodiment of the present invention, the carbonate compound pulverized in the crusher (330) may be transferred to the sieving machine (350) by a known transfer device (331) such as a conveyor device, or may be transferred to the sieving machine (350) manually or semi-automatically by a worker.

[0097] A carbon dioxide resource system (10) according to one embodiment of the present invention may further include a storage tank (370). The storage tank (370) may receive and store carbonate compound powder having a size of less than a predetermined value from a sieve (350).

[0098] In one embodiment of the present invention, the carbonate compound powder having a size below a predetermined value separated by the sieve (350) may be transferred to a storage tank (370) by a known transfer device (351) such as a conveyor device, or may be transferred to the storage tank (370) manually or semi-automatically by a worker.

[0099] A carbon dioxide resource system (10) according to one embodiment of the present invention may further include a first sensor (410) that measures the acidity (PH) within the main reactor (100). For example, the first sensor (410) may be a known sensor such as a PH meter, but is not limited thereto.

[0100] The first sensor (410) measures the acidity of the contents within the main reactor (100).

[0101] In this regard, if the carbonation reaction continues within the main reactor (100), the saturation of the contents within the main reactor (100) with respect to the carbonate compound increases, and the acidity of the contents within the main reactor (100) decreases.

[0102] When the duration of the carbonation reaction reaches a specific value, the contents inside the main reactor (100) become a saturated solution for the carbonate compound, and the acidity of the contents inside the main reactor (100) can have a specific value.

[0103] When the carbonation reaction continues after the contents in the main reactor (100) become a saturated solution for the carbonate compound, the acidity of the contents becomes lower than the specific value, and the carbonate compound produced by the carbonation reaction is not dissolved in the solvent but is precipitated.

[0104] At this time, the contents inside the main reactor (100) are in the form of a slurry in which a saturated solution of the carbonate compound and a solid carbonate compound are mixed. This slurry-like contents become the reaction product discharged to the centrifuge (200).

[0105] In one embodiment of the present invention, when the acidity of the contents in the main reactor (100) reaches a first set value, the reaction product may be discharged from the main reactor (100) to a centrifuge (200). In other words, when the measured value from the first sensor (410) reaches the first set value, the reaction product may be discharged from the main reactor (100) to a centrifuge (200).

[0106] The first setpoint may have a value lower than the specific acidity of the contents obtained experimentally and numerically at the moment when the contents in the main reactor (100) become a saturated solution for the carbonate compound.

[0107] Here, the first set value is determined to be lower than the specific acidity to make the contents inside the main reactor (100) not simply a saturated solution for the carbonate compound, but a slurry in which the saturated solution for the carbonate compound and the carbonate compound in solid form are mixed.

[0108] Meanwhile, when the value measured by the first sensor (410) reaches the first set value, an alarm may be generated by an alarm unit (not shown). The operator can recognize the time at which the reaction product must be discharged from the main reactor (100) through the alarm generated by the alarm unit.

[0109] Meanwhile, when the value measured by the first sensor (410) reaches the first set value, the control unit (not shown) opens the valve (not shown) formed in the reaction result transfer line (101). In this case, the reaction result can be transferred from the main reactor (100) to the centrifuge (200) through the reaction result transfer line (101).

[0110] Meanwhile, when the acidity of the contents in the main reactor (100) reaches the first set value, the supply of the first reaction gas flowing into the main reactor (100) to the main reactor (100) may be blocked.

[0111] Referring to FIGS. 1 and 2, a carbon dioxide resource system (10) according to one embodiment of the present invention may further include a stirrer (500) for stirring the contents inside the main reactor (100).

[0112] The stirrer (500) performs the role of stirring the first reaction solution and the first reaction gas introduced into the main reactor (100), and performs the role of stirring the slurry-type reaction result produced by the carbonation reaction inside the main reactor (100).

[0113] The stirrer (500) may include a stirring shaft (510), a stirring blade (520), and a driving motor (530).

[0114] The stirring shaft (510) is at least partially positioned within the main reactor (100).

[0115] The stirring shaft (510) may be positioned so that a portion thereof is located entirely within the main reactor (100), as shown in Fig. 2. In other words, a portion of the stirring shaft (510) may be positioned so as to be exposed to the outside of the main reactor (100).

[0116] The stirring shaft (510) may be arranged in a vertically extending form as shown in Fig. 1. Alternatively, although not shown, it may be arranged to extend in the left-right direction as seen in Fig. 1 or in any other direction.

[0117] At least one stirring blade (520) is formed on the outer surface of the stirring shaft (510) within the main reactor (100).

[0118] The drive motor (530) provides driving force to rotate the stirring shaft (510).

[0119] The driving power of the driving motor (530) can be transmitted by the power transmission member (540).

[0120] For example, the power transmission member (540) may include a first bevel gear (541) coupled to a driving motor (530) as shown in FIG. 2, and a second bevel gear (542) coupled to an outer surface of a stirring shaft (510) and meshed with the first bevel gear (541). The power transmission member (540) may further include a housing (543) surrounding the first bevel gear (541) and the second bevel gear (542).

[0121] The drive motor (530) may be supported on the housing (543) as shown in Fig. 2. Alternatively, although not shown, the drive motor (530) may be supported on the main stirrer (500).

[0122] As another example, the power transmission member (540) may include a worm gear (not shown) coupled to the driving motor (530) and a spur gear (not shown) coupled to the outer surface of the stirring shaft (510) and meshed with the worm gear.

[0123] The carbon dioxide resource system (10) according to one embodiment of the present invention as described above operates such that a first reaction gas and a first reaction solution are introduced into a main reactor (100), a slurry-type reaction product containing a carbonate compound produced as a result of a carbonation reaction is produced in the main reactor (100), and the produced reaction product is transferred to a centrifuge to separate a solid-type carbonate compound.

[0124] Therefore, carbon dioxide in the first reaction gas can be easily and effectively converted into a solid carbonate compound and utilized as a resource.

[0125] FIG. 3 is a drawing showing a carbon dioxide resource system according to another embodiment of the present invention, FIG. 4 is a drawing showing an enlarged portion B of FIG. 3 and a part thereof cut away, and FIG. 5 is a drawing showing an enlarged portion C of FIG. 3.

[0126] Referring to FIGS. 3 to 5, a carbon dioxide resource system (10-1) according to another embodiment of the present invention may be configured to include a main reactor (100), a centrifuge (200), a solution supply tank (50), a dryer (310), a crusher (330), a sieving machine (350), and a storage tank (370).

[0127] The carbon dioxide resource system (10-1) according to the present embodiment is different from the carbon dioxide resource system (10) according to the previous embodiment in that the first reaction gas is supplied into the main reactor (100) using the stirring shaft (510') of the stirrer (500').

[0128] In this embodiment, the stirrer (500') may include a stirring shaft (510'), a stirring blade (520), a driving motor (530), and a power transmission member (540).

[0129] At this time, the stirring shaft (510') has a hollow shape. The reaction gas can be introduced into the main reactor (100) through the hollow portion (511) of the stirring shaft (510'). At this time, a rotary joint (550) can be installed between the end of the stirring shaft (510') exposed to the outside of the main reactor (100) and the gas supply line (41).

[0130] A rotary joint (550) is a known device that interconnects a pair of relatively rotating pipes. For example, the rotary joint (550) may include a first rotating portion (551) and a second rotating portion (552) that are capable of relative rotation. The first rotating portion (551) and the second rotating portion (552) may be covered by a joint housing (553). The joint housing (553) may be supported by a housing (543) of the agitator (500).

[0131] In this embodiment, the first rotating part (551) of the rotary joint (550) can be coupled to the stirring shaft (510'), and the second rotating part (552) of the rotary joint (550) can be coupled to the gas supply line (41).

[0132] At least one gas discharge member (560) may be coupled to the stirring shaft (510'). The gas discharge member (560) has a hollow portion (561) connected to the hollow portion (511) of the stirring shaft (510'), and at least one gas discharge port (562) through which a first reaction gas is discharged is formed on the outer surface. At this time, the gas discharge port (562) may be formed to be fine in size so as to discharge fine bubbles.

[0133] In Fig. 3, a plurality of gas discharge members (560) can be arranged to extend radially around the stirring axis (510').

[0134] The stirring shaft (510') can extend to the lower part of the internal space of the main reactor (100). And the gas discharge member (560) can be coupled to the lower part of the stirring shaft (510').

[0135] In this case, the first reaction gas can be discharged below the liquid surface of the first reaction solution introduced into the main reactor (100), so that a carbonation reaction between the metal ions of the first reaction solution and the carbon dioxide of the first reaction gas can easily occur.

[0136] Furthermore, the slurry-type reaction product generated within the main reactor (100) as a result of the carbonation reaction can be effectively mixed by the exhaust force of the first reaction gas discharged from the gas discharge member (560).

[0137] And the discharge power of the first reaction gas discharged from the gas discharge member (560) can prevent the slurry-type reaction result from blocking the gas discharge port (562) formed in the gas discharge member (560).

[0138] The carbon dioxide resource system (10-1) according to the present embodiment configured as described above can have a simpler configuration of the device compared to a case where the stirrer and the means for supplying the first reaction gas are provided separately by using a stirring shaft (510') having a hollow shape as a transport path for the first reaction gas.

[0139] FIG. 6 is a drawing showing a carbon dioxide resource system according to another embodiment of the present invention.

[0140] Referring to FIG. 6, the carbon dioxide resource system (10-2) according to the present embodiment may be configured to include an auxiliary reactor (70), a main reactor (100), a centrifuge (200), a solution supply tank (50), a dryer (310), a crusher (330), a sieving machine (350), and a storage tank (370).

[0141] The carbon dioxide resource system (10-2) according to the present embodiment differs from the previous embodiment in that the first reaction solution flowing into the main reactor (100) is an auxiliary reaction product discharged from the auxiliary reactor (70).

[0142] More specifically, the auxiliary reactor (70) has a hollow tank shape.

[0143] The auxiliary reactor (70) receives a second reaction solution containing a dissolved metal compound and a second reaction solution containing carbon dioxide. Here, the second reaction solution includes a solvent and a solute, and the solute is a metal compound.

[0144] In this embodiment, the metal compound is M a (OH) b or M a It may have a chemical formula such as CO3, wherein M is a metal, and a and b are each 1 or 2.

[0145] For example, the metal compound may be Na2CO3, Ca(OH)2, or Mg(OH)2.

[0146] In this embodiment, the second reaction solution can be introduced into the auxiliary reactor (70) from the solution supply tank (50). The solution supply tank (50) is connected to the auxiliary reactor (70) by a solution transfer line (51). A valve (not shown) can be installed in the solution transfer line (51). The second reaction solution can be transferred from the solution supply tank (50) to the auxiliary reactor (70) by a known means, such as a pump (not shown).

[0147] The second reaction gas is a gas containing carbon dioxide.

[0148] In this embodiment, the second reaction gas may be a portion of the first reaction gas introduced into the main reactor (100) described below.

[0149] More specifically, the first reaction gas is a gas containing carbon dioxide, which can be supplied from a gas supply source (40) (not shown) to the main reactor (100). A portion of the first reaction gas supplied to the main reactor (100) can be transferred to the auxiliary reactor (70) via a gas transfer line (71) connecting the main reactor (100) and the auxiliary reactor (70).

[0150] A valve (not shown) may be installed in the gas transfer line (71).

[0151] For example, when the internal pressure of the main reactor (100) increases due to the continuous supply of the first reaction gas, a portion of the first reaction gas introduced into the main reactor (100) by the internal pressure of the main reactor (100) may be introduced into the auxiliary reactor (70) through the gas transfer line (71).

[0152] As another example, a portion of the first reaction gas introduced into the main reactor (100) may be introduced into the auxiliary reactor (70) by a known means such as a pump and used as a second gas.

[0153] One end of the gas transfer line (71) can be extended to the lower area of ​​the internal space of the auxiliary reactor (70).

[0154] Alternatively, the second reaction gas may be a separate gas unrelated to the first reaction gas introduced into the main reactor (100).

[0155] In this embodiment, an auxiliary reaction product including a carbonate compound generated by a carbonation reaction between carbon dioxide of the second reaction gas and some of the metal ions of the second reaction solution is generated within the auxiliary reactor (70).

[0156] In this embodiment, the auxiliary reaction product is an unsaturated solution of a carbonate compound produced by a carbonation reaction within the auxiliary reactor (70). This auxiliary reaction product is a solution containing a carbonate compound produced by the carbonation reaction and unreacted metal ions during the carbonation reaction.

[0157] The auxiliary reaction product in the auxiliary reactor (70) is transferred to the main reactor (100) by the auxiliary reaction product transfer line (72). A separate valve (not shown) may be installed in the auxiliary reaction product transfer line (72).

[0158] In this embodiment, the auxiliary reaction product in the auxiliary reactor (70) may be transferred to the main reactor (100) by gravity or pressure difference, or may be transferred to the main reactor (100) by a known means such as a pump (not shown).

[0159] A second sensor (420) may be used to measure the acidity within the auxiliary reactor (70). The second sensor (420) measures the acidity of the contents within the auxiliary reactor (70).

[0160] In this embodiment, when the acidity of the contents in the auxiliary reactor (70) reaches the second set value, the auxiliary reaction product from the auxiliary reactor (70) can be discharged to the main reactor (100).

[0161] In this regard, if the carbonation reaction continues within the auxiliary reactor (70), the saturation of the contents within the auxiliary reactor (70) with respect to the carbonate compound increases, and the acidity of the contents within the auxiliary reactor (70) decreases.

[0162] When the duration of the carbonation reaction reaches a specific value, the contents inside the auxiliary reactor (70) become a saturated solution for the carbonate compound, and the acidity of the contents inside the auxiliary reactor (70) can have a specific value.

[0163] The second setpoint may have a value higher than the specific acidity that the contents in the auxiliary reactor (70) have at the moment when they become a saturated solution for the carbonate compound, experimentally and numerically.

[0164] Here, the second set value is determined to be higher than a specific acidity to ensure that the contents in the auxiliary reactor (70) become an unsaturated solution for the carbonate compound.

[0165] In this embodiment, when the value measured by the second sensor (420) reaches the second set value, the second reaction solution can be transferred from the auxiliary reactor (70) to the main reactor (100) through the auxiliary reaction result transfer line (72).

[0166] In this embodiment, when the value measured by the second sensor (420) reaches the second set value, an alarm may be generated by an alarm unit (not shown). The operator can recognize the time at which the auxiliary reaction product must be discharged from the auxiliary reactor (70) through the alarm generated by the alarm unit.

[0167] Meanwhile, when the value measured by the second sensor (420) reaches the second set value, the control unit (not shown) opens the valve (not shown) formed in the auxiliary reaction result transfer line (72). In this case, the auxiliary reaction result can be transferred from the auxiliary reactor (70) to the main reactor (100) through the auxiliary reaction result transfer line (72).

[0168] In this embodiment, a first reaction solution and a first reaction gas containing carbon dioxide are introduced into the main reactor (100). A slurry-type reaction product containing a carbonate compound generated by a carbonation reaction between the carbon dioxide of the first reaction gas and the metal ions of the first reaction solution is generated inside the main reactor (100).

[0169] In this embodiment, the first reaction solution flowing into the main reactor (100) is the auxiliary reaction product discharged from the auxiliary reactor (70). At this time, the first reaction solution is a solution containing a carbonate compound produced by a carbonation reaction in the auxiliary reactor (70) and unreacted metal ions during the carbonation reaction.

[0170] While the carbonation reaction proceeds within the main reactor (100), the metal ions contained in the first reaction solution introduced into the main reactor (100) gradually decrease, and the newly generated carbonate compound gradually increases. In this case, the first reaction solution within the main reactor (100) changes into a solution having different components.

[0171] In this embodiment, a carbonate compound newly generated by a carbonation reaction within the main reactor (100) is dissolved in a solution within the main reactor (100).

[0172] Until a predetermined period of time has elapsed, the solution in the main reactor (100) is an unsaturated solution for carbonate compounds, as it is a solution in which carbonate compounds produced by a carbonation reaction in the auxiliary reactor (70) and carbonate compounds newly produced by a carbonation reaction in the main reactor (100) are dissolved.

[0173] After a certain amount of time has elapsed, the solution inside the main reactor (100) becomes a saturated solution for the carbonate compound.

[0174] After the solution in the main reactor (100) becomes a saturated solution for the carbonate compound, the carbonate compound produced is not dissolved in the solution but precipitates. At this time, a slurry-type reaction product is produced in the main reactor (100) in which the saturated solution for the carbonate compound and the solid carbonate compound are mixed.

[0175] In this embodiment, since a predetermined amount of carbonate compound is already dissolved in the auxiliary reaction product, i.e., the first reaction solution discharged from the auxiliary reactor (70) and introduced into the main reactor (100), a slurry-type reaction product containing a carbonate compound produced by a carbonation reaction in the main reactor (100) can be produced in a relatively short time.

[0176] In this embodiment, when the acidity of the contents in the main reactor (100) reaches the first set value, the reaction product from the main reactor (100) can be discharged to the centrifuge (200).

[0177] The slurry-type reaction product discharged from the main reactor (100) is introduced into a centrifuge (200). In the centrifuge (200), the reaction product is separated into a solid carbonate compound and a liquid. Here, the liquid is a saturated solution for the carbonate compound.

[0178] The carbonate compound separated from the reaction product by the centrifuge (200) can be collected from the centrifuge (200) and processed to be used as a resource. For example, the carbonate compound separated from the reaction product by the centrifuge (200) can be used as a resource by passing through a dryer (310), a crusher (330), a sifter (350), and a storage tank (370).

[0179] The liquid separated from the reaction product by the centrifuge (200) can be recovered to the solution supply tank (50) through the recovery line (105) and reused.

[0180] The carbon dioxide resource system (10-2) according to the present embodiment may further include a stirrer (500) for stirring the contents inside the main reactor (100). The stirrer (500) according to the present embodiment is identical to the stirrer (500) of the previous embodiment described above with reference to FIG. 1.

[0181] The carbon dioxide resource system (10-2) according to the present embodiment may further include an auxiliary stirrer (600) for stirring the contents inside the auxiliary reactor (70).

[0182] The auxiliary stirrer (600) may include an auxiliary stirring shaft (610), an auxiliary stirring blade (620), and an auxiliary driving motor (630). The driving principle of the auxiliary stirrer (600) is the same as that of the stirrer (500) of the previous embodiment described above with reference to FIG. 1.

[0183] Fig. 7 is a drawing showing a carbon dioxide resource system according to another embodiment of the present invention. The carbon dioxide resource system (10-3) according to the present embodiment may be configured to include an auxiliary reactor (70), a main reactor (100), a centrifuge (200), a solution supply tank (50), a dryer (310), a crusher (330), a sieving machine (350), a storage tank (370), and the like.

[0184] The carbon dioxide resource system (10-3) according to the present embodiment is different from the carbon dioxide resource system (10-2) according to the previous embodiment in that the stirring shaft (510') of the stirrer (500') and the auxiliary stirring shaft (610') of the auxiliary stirrer (600') have a hollow shape and are used as passages for introducing the first reaction gas and the second reaction gas into the main reactor (100) and the auxiliary reactor (70), respectively.

[0185] Among the configurations illustrated in Fig. 7, configurations given the same reference numbers as those illustrated in Fig. 6 represent the same elements, and a detailed description thereof will be replaced with the description of Fig. 7.

[0186] In this embodiment, the stirring shaft (510') of the stirrer (500') can be fluidly connected to the gas supply line (41) by a rotary joint (550). At least one gas discharge member (560) can be coupled to the stirring shaft (510'). The first reaction gas can be introduced into the main reactor (100) from the gas supply line (41) via the rotary joint (550), the stirring shaft (520'), and the gas discharge member (560).

[0187] In this embodiment, the auxiliary stirring shaft (610') of the auxiliary stirrer (600') can also be fluidly connected to the gas transfer line (71) by the auxiliary rotary joint (650). Gas can be introduced into the auxiliary reactor (70) from the gas transfer line (71) via the auxiliary rotary joint (650), the auxiliary stirring shaft (610'), and the gas discharge member (660).

[0188] FIG. 8 is a drawing illustrating a carbon dioxide resource system according to another embodiment of the present invention.

[0189] The carbon dioxide resource system (10-4) according to the present embodiment may be configured to include an auxiliary reactor (70), a main reactor (100), a centrifuge (200), a solution supply tank (50), a dryer (310), a crusher (330), a sieving machine (350), a storage tank (370), a mixer (700), etc.

[0190] The carbon dioxide resource system (10-4) according to the present embodiment has some differences from the system (10-3) of the preceding embodiment illustrated in FIG. 7 in terms of the mixing mechanism of the second reaction solution and the second reaction gas.

[0191] Among the configurations illustrated in Fig. 8, configurations given the same reference numbers as those illustrated in Fig. 7 represent the same elements, and a detailed description thereof will be replaced with the description of Fig. 7.

[0192] A second reaction solution containing a metal compound dissolved therein and a second reaction gas containing carbon dioxide are supplied to the auxiliary reactor (70).

[0193] In this embodiment, the second reaction solution and the second reaction gas can be supplied to the auxiliary reactor (70) in a mixed state from outside the auxiliary reactor (70).

[0194] For this purpose, a mixer (700) is used.

[0195] A mixer (700) is provided with a second reaction solution containing dissolved metal compounds and a second reaction gas containing carbon dioxide, which are then mixed. The second reaction solution and the second reaction gas mixed in the mixer (700) are introduced into an auxiliary reactor (70). The mixer (700) may be a known mixer that mixes different fluids.

[0196] In this embodiment, the second reaction solution flowing into the mixer (700) is discharged from the auxiliary reactor (70). The second reaction solution flowing into the auxiliary reactor (70) through the solution transfer line (51) from the solution supply tank (50) flows into the mixer (700) through the first connection line (701). A pump (not shown), a valve (not shown), etc. may be installed in the first connection line (701).

[0197] Alternatively, the mixer (700) may be directly connected to the solution supply tank (50) to receive the second reaction solution.

[0198] In this embodiment, the mixer (700) is connected to a gas supply source (40). The mixer (700) and the gas supply source (40) are connected via a gas transfer line (42). The second reaction gas is transferred from the gas supply source (40) to the mixer (700) via the gas transfer line (42). A pump (not shown), a valve (not shown), etc. may be installed in the gas transfer line (42).

[0199] The second reaction solution and the second reaction gas mixed in the mixer (700) can be introduced into the auxiliary reactor (70) through the second connection line (702). A pump (not shown), a valve (not shown), etc. can be installed in the second connection line (702).

[0200] In this case, the agitator (600') shown in FIG. 7 is not combined with the auxiliary reactor (70), so the manufacturing difficulty is reduced and the manufacturing cost and time can be saved.

[0201] Fig. 9 is a flowchart of a carbon dioxide resource conversion method according to one embodiment of the present invention. The carbon dioxide resource conversion method according to this embodiment can be implemented, for example, through the carbon dioxide resource conversion systems (10, 10-1, 10-2, 10-3, 10-4) described in Figs. 1 to 8.

[0202] Hereinafter, referring to FIGS. 1 to 9, the carbon dioxide resource conversion method according to the present embodiment may include a step (S110) of supplying a first reaction gas and a first reaction solution to a main reactor (100), a step (S120) of generating a reaction result in the form of a slurry containing a carbonate compound within the main reactor (100), and a step (S130) of separating the reaction result into a solid carbonate compound and a liquid in a centrifuge (200).

[0203] In step (S110), a first reaction gas containing carbon dioxide and a first reaction solution in which a metal compound is dissolved are supplied to the main reactor (100). At this time, the first reaction gas may be supplied by a gas supply line (41) extending into the interior of the main reactor (100) as shown in FIG. 2, or may be supplied by a hollow stirring shaft (510') connected to the gas supply line (41) as shown in FIG. 4.

[0204] The metal compound dissolved in the first reaction solution is M a (OH) b or M a It may have a chemical formula such as CO3, wherein M is a metal, and a and b are each 1 or 2.

[0205] For example, the metal compound may be Na2CO3, Ca(OH)2, or Mg(OH)2.

[0206] In step (S120), a slurry-type reaction product containing a carbonate compound generated by a carbonation reaction between carbon dioxide of the first reaction gas and metal ions of the first reaction solution is generated in the main reactor (100).

[0207] In this example, the reaction product has a slurry form in which a saturated solution of carbonate and a precipitated and solidified carbonate compound are mixed.

[0208] The carbon dioxide resource recovery method according to the present embodiment may further include a step of transferring the reaction result of the main reactor (100) to a centrifuge (200) between steps (S120) and (S130).

[0209] At this time, when the acidity of the contents in the main reactor (100) is measured and the measured value reaches the first set value, the reaction result can be transferred by opening a valve (not shown) installed in the reaction result transfer line (101) and in a closed operation.

[0210] At this time, the opening operation of the valve can be performed manually by the operator or automatically by the control unit.

[0211] At this time, the reaction result may be transferred to the centrifuge (200) by gravity or pressure difference. Alternatively, the reaction result may be transferred to the centrifuge (200) by a known means such as a pump.

[0212] In step (S130), the reaction product is separated into a solid carbonate compound and a liquid in a centrifuge (200).

[0213] At this time, the solid carbonate compound separated from the reaction product can be collected, processed, and used as a resource. The liquid separated from the reaction product can be recovered and recycled.

[0214] Although not shown in FIG. 9, a carbon dioxide resource conversion method according to one embodiment of the present invention may further include a step (S140) of drying a carbonate compound in a solid form in a dryer (310), a step (S150) of crushing the dried carbonate compound in a crusher (330), and a sieving step (S160) of separating the crushed carbonate compound by size.

[0215] Although not shown in FIG. 9, a carbon dioxide resource conversion method according to one embodiment of the present invention may further include, prior to step (S110), a step (S60) of supplying a second reaction gas and a second reaction solution to an auxiliary reactor (70), a step (S70) of generating an auxiliary reaction product including a carbonate compound within the auxiliary reactor (70), and a step (S80) of transporting the auxiliary reaction product to the main reactor (100) to be used as a first reaction solution.

[0216] In step (S60), a second reaction gas containing carbon dioxide and a second reaction solution in which a metal compound is dissolved are supplied to an auxiliary reactor (70).

[0217] At this time, a portion of the first reaction gas introduced into the main reactor (100) may be introduced into the auxiliary reactor (70) and used as the second reaction gas, but is not limited thereto.

[0218] In step (S70), an auxiliary reaction product including a carbonate compound generated by a carbonation reaction between carbon dioxide of the second reaction gas and some of the metal ions of the second reaction solution in the auxiliary reactor (70) is generated. 41

[0219] The auxiliary reaction product produced in the auxiliary reactor (70) can be introduced into the main reactor (100) and used as the first reaction solution.

[0220] In step (S80), when the acidity of the contents in the auxiliary reactor (70) reaches the second set value, a valve (not shown) installed in the auxiliary reaction result transfer line (72) and in a closed operation opens to transfer the reaction result.

[0221] At this time, the opening operation of the valve can be performed manually by the operator or automatically by the control unit.

[0222] At this time, the auxiliary reaction product may be transferred to the main reactor (100) by gravity or pressure difference. Alternatively, the auxiliary reaction product may be transferred to the main reactor (100) by a known means such as a pump.

[0223] As described above, embodiments of the present invention have been described, but the spirit of the present invention is not limited to the embodiments presented in this specification, and those skilled in the art who understand the spirit of the present invention will be able to easily propose other embodiments by adding, changing, deleting, or adding components within the scope of the same spirit, but this will also be considered to fall within the spirit scope of the present invention.

Claims

1. A main reactor that receives a first reaction solution containing a dissolved metal compound and a first reaction gas containing carbon dioxide, and produces a slurry-type reaction product containing a carbonate compound produced by a carbonation reaction between the metal ions of the first reaction solution and the carbon dioxide of the first reaction gas; and A carbon dioxide resource system, comprising a centrifuge that separates the reaction product discharged from the main reactor into a solid carbonate compound and a liquid.

2. In paragraph 1, A carbon dioxide resource system further comprising a dryer for drying the solid carbonate compound separated through the centrifuge.

3. In paragraph 2, A carbon dioxide resource system further comprising a pulverizer for pulverizing the carbonate compound dried in the above dryer.

4. In paragraph 1, The chemical formula of the above metal compound is M a (OH) b or M a It's CO3, A carbon dioxide resource system wherein the above M is a metal, and the above a and b are each 1 or 2.

5. In paragraph 4, A carbon dioxide resource system, wherein the metal compound is one of Ca(OH)2, Mg(OH)2 and Na2CO3.

6. In paragraph 1, A carbon dioxide resource system in which the reaction product from the main reactor is discharged to the centrifuge when the acidity (PH) of the contents within the main reactor reaches a first set value.

7. In paragraph 1, A carbon dioxide resource system further comprising a stirrer for stirring the contents within the main reactor.

8. In paragraph 7, The above stirrer A stirring shaft, at least a portion of which is disposed within the main reactor; At least one stirring blade formed on the outer surface of the stirring shaft within the main reactor; and A carbon dioxide resource system comprising a driving motor that provides driving force for rotating the above-mentioned stirring shaft.

9. In paragraph 8, The above stirring shaft has a hollow shape, A carbon dioxide resource system in which the first reaction gas is introduced into the main reactor through the hollow portion of the stirring shaft.

10. In paragraph 9, A carbon dioxide resource system, wherein at least one gas discharge member is coupled to the stirring shaft to disperse and discharge the first reaction gas moving through the stirring shaft within the main reactor.

11. In paragraph 1, A carbon dioxide resource system further comprising a solution supply tank for storing the first reaction solution supplied to the main reactor.

12. In paragraph 1, It further includes an auxiliary reactor that receives a second reaction solution containing the metal compound dissolved therein and a second reaction gas containing carbon dioxide, and produces an auxiliary reaction product including a carbonate compound produced by a carbonation reaction of a portion of the metal ions of the second reaction solution. The acid auxiliary reaction product is an unsaturated solution for the carbonated compound generated in the auxiliary reactor, A carbon dioxide resource system in which the auxiliary reaction product is introduced into the main reactor and used as the first reaction solution.

13. In paragraph 12, A carbon dioxide resource system in which a portion of the first reaction gas introduced into the main reactor is introduced into the auxiliary reactor and used as the second reaction gas.

14. In paragraph 12, A carbon dioxide resource system, wherein the second reaction solution and the second reaction gas are supplied to the auxiliary reactor in a mixed state from outside the auxiliary reactor.

15. In paragraph 12, A carbon dioxide resource system in which, when the acidity (PH) of the auxiliary reaction product within the auxiliary reactor reaches a second set value, the auxiliary reaction product is discharged from the auxiliary reactor to the main reactor. 16.(a) A step of supplying a first reaction gas containing carbon dioxide and a first reaction solution containing a dissolved metal compound to a main reactor; (b) a step of generating a reaction product in the form of a slurry containing a carbonate compound generated by a carbonation reaction between the carbon dioxide of the first reaction gas and the metal ions of the first reaction solution in the main reactor; and (c) A method for recycling carbon dioxide, comprising a step of separating the reaction result into a solid carbonate compound and a liquid in a centrifuge.

17. In paragraph 16, (d) a step of drying the carbonate compound in solid form in a dryer; (e) a step of pulverizing the dried carbonate compound in a pulverizer; (f) A method for utilizing carbon dioxide as a resource, further comprising a sieving step of separating the crushed carbonate compound by size in a sieving machine.

18. In paragraph 16, Before step (a) above, (p) a step of supplying a second reaction gas containing carbon dioxide and a second reaction solution in which the metal compound is dissolved to an auxiliary reactor; (q) a step of generating an auxiliary reaction product including a carbonate compound generated by a carbonation reaction between the carbon dioxide of the second reaction gas and some of the metal ions of the second reaction solution in the auxiliary reactor; and (r) A method for recycling carbon dioxide, further comprising a step of transferring the auxiliary reaction product to the main reactor to be used as the first reaction solution.

19. In paragraph 18, A method for recycling carbon dioxide, wherein a portion of the first reaction gas introduced into the main reactor is introduced into the auxiliary reactor and used as the second reaction gas.

20. In paragraph 16, The chemical formula of the above metal compound is M a (OH) b or M a It's CO3, The above M is a metal, and the above a and b are each 1 or 2, A method for recycling carbon dioxide, wherein the metal compound is any one of Ca(OH)2, Mg(OH)2 and Na2CO3.

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