CN117500766A - Carbonation method of CaO-containing materials method for producing carbonated material - Google Patents
Carbonation method of CaO-containing materials method for producing carbonated material Download PDFInfo
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- CN117500766A CN117500766A CN202280042509.5A CN202280042509A CN117500766A CN 117500766 A CN117500766 A CN 117500766A CN 202280042509 A CN202280042509 A CN 202280042509A CN 117500766 A CN117500766 A CN 117500766A
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- cao
- carbonation
- gas
- carbon dioxide
- containing substance
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000000463 material Substances 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 83
- 239000000126 substance Substances 0.000 claims abstract description 47
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 41
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 41
- 239000002893 slag Substances 0.000 claims description 41
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 239000004567 concrete Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000009628 steelmaking Methods 0.000 claims description 9
- 239000002699 waste material Substances 0.000 claims description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 238000007664 blowing Methods 0.000 abstract description 9
- 239000007789 gas Substances 0.000 description 42
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 28
- 229910052500 inorganic mineral Inorganic materials 0.000 description 14
- 239000011707 mineral Substances 0.000 description 14
- 239000002245 particle Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 238000007873 sieving Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000004035 construction material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000004455 differential thermal analysis Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000004442 gravimetric analysis Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/70—Chemical treatment, e.g. pH adjustment or oxidation
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B2101/00—Type of solid waste
- B09B2101/45—Concrete
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B2101/00—Type of solid waste
- B09B2101/55—Slag
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention provides a carbonation method of CaO-containing substances, it is possible to achieve a high carbonic acid fixation rate without adjusting the moisture of the CaO-containing unit. The invention relates to a carbonation method of CaO-containing substances, and blowing a carbon dioxide-containing gas to the CaO-containing material for 10 minutes or more at a temperature of 400 to 1200 ℃.
Description
Technical Field
The present invention relates to a method for carbonating a CaO-containing substance and a method for producing a carbonated substance, including a step of carbonating a solidified CaO-containing substance by blowing a gas containing carbon dioxide to the CaO-containing substance.
Background
It is said that a measure for reducing the amount of carbon dioxide discharged is urgent because 2t of carbon dioxide is produced when 1t of pig iron is produced by the blast furnace method. Therefore, as one of methods for reducing the amount of carbon dioxide discharged, a carbonation process has been devised in which CaO component contained in slag produced in a steel mill reacts with carbon dioxide to fix carbon dioxide to carbonate.
For example, patent document 1 describes a method for effectively carbonating a steel-making slag while suppressing granulation of slag particles by supplying a carbon dioxide-containing gas to the steel-making slag after drying treatment.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication No. 2014-234332
Disclosure of Invention
However, in the method of patent document 1, since the carbonation treatment is performed at a low temperature of 0 to 80 ℃, it is presumed that the reaction rate is slow and the fixed amount of carbon dioxide becomes small, that is, the fixed ratio of carbonic acid becomes small. In addition, the water content of the slag needs to be adjusted, and the treatment is complicated.
In view of the above problems, an object of the present invention is to provide a method for carbonation of a CaO-containing substance, which can achieve a high carbonic acid fixation rate without adjusting moisture of the CaO-containing substance, and a method for production of a carbonated substance using the carbonation method.
The present inventors have studied and have found the following findings: by blowing a gas containing carbon dioxide to a CaO-containing substance for 10 minutes or more in a state where the temperature of the CaO-containing substance is 400 to 1200 ℃, a high carbonic acid fixation rate can be achieved.
The gist of the present invention completed based on the above findings is as follows.
[1] A method for carbonating a CaO-containing substance, wherein a gas containing carbon dioxide is blown to the CaO-containing substance for at least 10 minutes at a temperature of 400 to 1200 ℃.
[2] The method for carbonating a CaO-containing unit according to the item [1], wherein the gas contains water vapor.
[3]According to [1] above]Or [2]]The carbonation method of CaO-containing components, wherein H in the gas 2 O/(H 2 O+CO 2 ) The flow ratio of (2) is 0.03-0.30.
[4] The method for carbonation of a CaO-containing component according to any one of [1] to [3], wherein the gas is blown into the CaO-containing component in such a manner that a supply amount of carbon dioxide per 1t of the CaO-containing component is 5kg or more.
[5]According to [1] above]～[4]The method for carbonation of a CaO-containing component according to any one of the above, wherein the CaO-containing component contains 30 mass% or more of CaO and CaO/SiO 2 The mass ratio of (2) is more than 1.5.
[6] The method for carbonation of a CaO-containing component containing unit as described in any one of [1] to [5], wherein the CaO-containing component is steel slag.
[7] The method for carbonating a CaO-containing unit according to the item [6], wherein the steel slag is steel-making slag.
[8] The method for carbonation of a CaO-containing component as described in any one of [1] to [5], wherein the CaO-containing component is waste concrete.
[9] A method for producing a carbonated material, wherein the CaO-containing material is carbonated by the method for carbonation of a CaO-containing material of any one of [1] to [8] above.
According to the method for carbonating a CaO-containing unit and the method for producing a carbonatate of the present invention, a high carbonic acid fixing rate can be achieved without adjusting the moisture of the CaO-containing unit. Thus, the present invention is an industrially extremely effective process because carbon dioxide in the atmosphere is fixed to a CaO-containing substance at a high carbonic acid fixation rate, which greatly contributes to a reduction in the amount of carbon dioxide discharged.
Drawings
FIG. 1 is a graph showing the relationship between the slag temperature and the carbonic acid fixing rate in Experimental example 1.
Detailed Description
(carbonation method of CaO-containing Material)
The method for carbonating a CaO-containing unit according to one embodiment of the present invention includes a step of blowing a carbon dioxide-containing gas to the CaO-containing unit for 10 minutes or longer in a state where the temperature of the CaO-containing unit is 400 to 1200 ℃. Hereinafter, details of the carbonation method of the CaO-containing substance according to the present embodiment will be described.
[ CaO-containing Material ]
The material to be treated in the present embodiment is a coagulated CaO-containing material. The CaO-containing substance is carbonated by supplying a gas containing carbon dioxide to the solidified CaO-containing substance and fixing carbon dioxide to the CaO-containing substance by the following reaction.
CaO+CO 2 →CaCO 3
In the present embodiment, the CaO-containing material as the material to be treated preferably contains CaO/SiO 2 The mass ratio of (2) is 1.5 or more and contains 30 mass% or more of CaO. The CaO-containing material having such a composition contains free-CaO and beta-2 CaOSiO 2 As mineral phases (hereinafter, referred to as "beta-C 2 S "). The free-CaO is preferably carbonated by a carbon dioxide-containing gas. In addition, the details will be described later, but beta-C 2 S exhibits a high carbonic acid fixation rate by containing water vapor and carbon dioxide gas.
Examples of the CaO-containing steel slag include steel slag produced as a by-product in the steel production process. Steel slag is largely classified into blast furnace slag and steel-making slag. Although steel slag varies depending on the type, it contains 30 to 50 mass% of CaO, and thus carbon dioxide fixation can be expected by blowing carbon dioxide to a mineral phase containing CaO. In addition, not only CaO but also MgO, which is an oxide of an alkali metal, can be expected to have the same effect.
The steel slag used as the CaO-containing substance is preferably steel-making slag. Since the steel slag contains a large amount of free-CaO, a higher carbonic acid fixation rate can be achieved. In addition, the steel-making slag also contains beta-C 2 S is also preferred.
Further, as the CaO-containing substance, waste concrete may be exemplified. The waste concrete is a construction waste, and is concrete of a specific construction material which must be separated, removed, and recycled according to a construction material recycling method, and the like. These waste concretes include those obtained by pulverizing used concretes so as to meet JIS A5023: 2018 recycled aggregate concrete L, appendix a, and meeting JIS a 5023: recycled aggregate M for concrete in annex a of 2018 recycled aggregate concrete M, recycled crushed stone, recycled sand, and the like described in a manual for pavement recycling (japan road association, plain 22 years). These waste concrete include cements such as portland cement, and contain CaO in an amount of about 60 mass%, and thus can achieve a higher carbonic acid fixation rate.
The particle size of the CaO-containing material is not particularly limited, and may be, for example, a particle size suitable for the steel slag for road. The grain size distribution of the steel slag for road is defined in JIS A5015-2018, and in particular CS-40 can be used. CS-40 has a particle size distribution having a particle size range of 40 to 0mm, a sieving rate of 53mm based on the nominal pore diameter of a wire mesh defined in JIS Z8801-1 of 100 mass%, a sieving rate of 37.5mm of 95 to 100 mass%, a sieving rate of 19mm of 50 to 80 mass%, a sieving rate of 4.75mm of 15 to 40 mass%, and a sieving rate of 2.36mm of 5 to 25 mass%.
[ carbonation treatment ]
In this embodiment, it is important to set the temperature of the CaO-containing substance to a range of 400 to 1200 ℃. When the temperature is less than 400 ℃, the reaction rate is low, and a high fixation rate of carbonic acid cannot be achieved. Therefore, the temperature is set to 400 ℃ or higher. From the viewpoint of achieving a higher carbonic acid fixation ratio, the temperature is preferably 600 ℃ or higher, more preferably 800 ℃ or higher. On the other hand, if the temperature exceeds 1200 ℃, fe and CO contained in the slag 2 The reaction occurs, and the reaction between FeO and CO gas occurs, so that the supplied carbon dioxide is not preferable because it is difficult to use the carbon dioxide for the production of calcium carbonate. Therefore, the temperature is set to 1200 ℃ or lower. In order to achieve a higher carbonic acid fixation ratio, the temperature is preferably 1100 ℃ or lower, more preferably 1000 ℃ or lower.
The method of setting the temperature of the CaO-containing substance to the above range is not particularly limited, and for example, when the temperature of the CaO-containing substance after thermal pulverization is within the above range, the carbonation treatment of the present embodiment may be directly performed.
The carbonation time (gas blowing time) in a state where the temperature of the CaO-containing unit is within the above range is set to 10 minutes or more. This enables to achieve a high carbonic acid fixation rate. When the treatment time is less than 10 minutes, a high carbonic acid fixation rate cannot be achieved due to the short treatment time. From the viewpoint of achieving a higher carbonic acid fixation ratio, the treatment time is preferably 30 minutes or more. On the other hand, if the treatment time is too long, the temperature of the CaO-containing substance is lowered, which is not preferable. Therefore, the treatment time is preferably 180 minutes or less, more preferably 60 minutes or less.
The carbonation treatment may be performed by disposing the CaO-containing substance under the atmosphere, or may be performed by housing the CaO-containing substance in a closed container. The initial atmosphere in the closed vessel is not particularly limited, and may be air or nitrogen (N 2 ) And inert gases. When the carbonation is performed in the closed vessel, the carbonation may be performed while stirring the CaO-containing substance by rotating the closed vessel or the like. The temperature of the atmosphere in which the CaO-containing substance is disposed during the carbonation treatment is preferably the same temperature as the CaO-containing substance.
The gas (supply gas) to be blown onto the CaO-containing substance is not particularly limited as long as it is a gas containing carbon dioxide. One example of a preferable supply gas from the viewpoint of achieving a high carbonic acid fixation rate is a gas containing water vapor and carbon dioxide, and a gas composed of water vapor and carbon dioxide is preferable. As a result of the studies by the present inventors, it has been found that the CaO-containing compounds contain β -C 2 In the case of S, the beta-C 2 S exhibits a high carbonic acid fixation rate due to the gas containing water vapor and carbon dioxide. At this time, H in the gas is supplied 2 O/(H 2 O+CO 2 ) The flow rate ratio (volume ratio) of (a) is preferably 0.03 to 0.30. By setting the flow rate ratio to 0.03 or more, beta-C 2 The carbonic acid fixation rate of S is obviously improved. On the other hand, from the viewpoint of achieving stable flow rate control and suppressing corrosion of the gas supply device, the flow rate ratio is preferably 0.30 or less.
From the viewpoint of achieving a high carbonic acid fixation rate, the amount of carbon dioxide to be supplied is preferably 5kg or more, more preferably 50kg or more per 1t of CaO-containing substance, regardless of whether the supplied gas contains water vapor. The upper limit of the amount of carbon dioxide to be supplied is not particularly limited, and if the amount of the gas to be supplied is too large relative to the mass of the CaO-containing substance, the temperature of the CaO-containing substance is reduced by the supplied gas, so that it is preferably 200kg or less per 1t of CaO-containing substance. The temperature of the supplied gas is preferably 20 to 1300 ℃, and more preferably the same temperature as that of the CaO-containing substance.
(method for producing carbonated Material)
The method for producing a carbonated material according to an embodiment of the present invention includes a step of producing a carbonated material by carbonating a CaO-containing material by the above-described method for carbonating a CaO-containing material according to an embodiment. This can produce a carbonated material in which a large amount of carbon dioxide is fixed.
Examples
Experimental example 1
The carbonation test was performed according to the following procedure. First, as a CaO-containing substance, an uncured decarburized slag, which is one kind of steel-making slag, is prepared. The decarburized slag is classified into a particle size distribution of CS-40. The composition of the decarburized slag is shown in Table 1. Disposing decarburized slag in the electric furnace to make N in the electric furnace 2 The decarburized slag was heated to the slag temperature shown in Table 2 in the atmosphere, and in this state, a gas having the composition shown in Table 2 (gas temperature: 100 ℃ C.) was blown for 10 minutes to carry out carbonation treatment. In each example, the carbon dioxide supply amount was set to 200kg for each 1t of decarburized slag. After cooling in the furnace, the carbonic acid fixation rate was measured based on the change in the weight of the slag. The test results are shown in table 2 and fig. 1.
As can be seen from Table 2 and FIG. 1, 5kg-CO was achieved at a slag temperature in the range of 400 to 1200 DEG C 2 High carbonic acid fixation rate above/t-slag. It is considered that the free-CaO in the decarburized slag is carbonated when the feed gas does not contain steam. If the slag temperature exceeds 1200 ℃, the slag itself starts to melt and decomposition of carbon dioxide occurs, so that the carbonic acid fixation rate becomes low.
Experimental example 2
Single phases of 5 mineral phases shown in table 3 in the main mineral phases contained in the steel-making slag were produced, and the grain size was set to 0.075mm or less. N was blown using a thermogravimetric differential thermal analysis device (TG-DTA device) with controllable atmosphere 2 The gas is heated to 500 ℃ until the temperature of the mineral phase reaches 500 ℃ and is shown in N 2 Heating the mineral phase in the atmosphere, and heating N when the temperature of the mineral phase reaches 500 DEG C 2 The gas was changed to a gas having a composition shown in Table 3 (gas temperature: 100 ℃ C.) and was blown onto each of the mineral phases to carry out carbonation treatment. The carbonation process was carried out for 60 minutes and then switched to N 2 The gas cools each mineral phase. The amount of carbon dioxide supplied was 100kg per 1t of mineral phase. The carbonic acid fixation rate in each mineral phase was measured based on the amount of change in the weight of each mineral phase. The results are shown in Table 3.
As is clear from Table 3, by including steam in the feed gas, β -C 2 The carbonic acid fixation rate of S is obviously improved. The other mineral phases are substantially free of fixed carbon dioxide. Since this reaction is completed in a short time of 10 minutes or less, it is found that carbon dioxide can be sufficiently fixed to β -C by blowing a gas containing steam and carbon dioxide to a high-temperature steel slag for 10 minutes or more 2 S, S. If H 2 O/(H 2 O+CO 2 ) If the flow rate ratio exceeds 0.30, the supply of water vapor increases, condensation of water occurs, and the flow rate becomes unstable, so that conditions cannot be created.
Experimental example 3
Manufacture of beta-C using reagents 2 S is a single phase, and the particle size is set to be less than 0.075 mm. Using a controllable gasThermal gravimetric analysis device (TG-DTA device) for atmosphere, and N-blowing 2 Gas up to beta-C 2 The temperature of S reached the value shown in Table 4, at N 2 beta-C in atmosphere 2 S heating to beta-C 2 When the temperature of S reaches the value shown in Table 4, N is a value 2 The gas was switched to a gas having the composition shown in Table 4 (gas temperature: 100 ℃ C.) and was turned to beta-C 2 S, blowing and carbonating. The carbonation process was carried out for 60 minutes and then switched to N 2 Gas, cooled beta-C 2 S, S. The carbon dioxide supply amount was set to be β -C per 1t 2 S is 100kg. According to beta-C 2 Measurement of the amount of change in weight of S beta-C 2 The carbonic acid fixation ratio in S. The results are shown in Table 4. In the beta-C 2 The case where the temperature of S was 500℃was the same test as in Experimental example 2. That is, this experimental example 3 relates to beta-C in 5 mineral phases in experimental example 2 2 S, p-C 2 The temperature of S was varied variously, and the same test as in experimental example 2 was performed.
As is clear from Table 4, by including steam in the feed gas, β -C 2 The carbonic acid fixation rate of S is obviously improved, and the effect is beta-C 2 The temperature of S is in the range of 400-1200 ℃.
Industrial applicability
According to the method for carbonating a CaO-containing unit and the method for producing a carbonatate of the present invention, a high carbonic acid fixing rate can be achieved without adjusting the moisture of the CaO-containing unit. Thus, the present invention is an industrially extremely effective process because carbon dioxide in the atmosphere is fixed to a CaO-containing substance at a high carbonic acid fixation rate, which greatly contributes to a reduction in the amount of carbon dioxide discharged.
Claims (9)
1. A method for carbonating a CaO-containing substance, wherein a gas containing carbon dioxide is blown to the CaO-containing substance for 10 minutes or longer in a state where the temperature of the CaO-containing substance is 400 to 1200 ℃.
2. The carbonation method of CaO-containing material according to claim 1, wherein the gas contains water vapor.
3. A method of carbonation of CaO containing materials according to claim 1 or 2, wherein H in the gas 2 O/(H 2 O+CO 2 ) The flow ratio of (2) is 0.03-0.30.
4. A carbonation method according to any one of claims 1 to 3 in which said gas is blown onto said CaO-containing substance in such a manner that the supply amount of carbon dioxide per 1t of said CaO-containing substance is 5kg or more.
5. The method for carbonation of a CaO containing substance according to any one of claims 1 to 4, where the CaO containing substance contains 30 mass% or more CaO and where CaO/SiO 2 The mass ratio of (2) is more than 1.5.
6. The carbonation method for a CaO-containing substance according to any one of claims 1 to 5, wherein the CaO-containing substance is steel slag.
7. The carbonation method of CaO containing material according to claim 6 wherein the steel slag is a steel-making slag.
8. The carbonation method for CaO-containing materials according to any one of claims 1 to 5, wherein the CaO-containing materials are waste concrete.
9. A method for producing a carbonated material, wherein the CaO-containing material is carbonated by the carbonation method according to any one of claims 1 to 8.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021102032 | 2021-06-18 | ||
| JP2021-102032 | 2021-06-18 | ||
| PCT/JP2022/017523 WO2022264668A1 (en) | 2021-06-18 | 2022-04-11 | Method for carbonating cao-containing substance and method for producing carbonated substance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
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| JP (1) | JP7405263B2 (en) |
| KR (1) | KR20240006685A (en) |
| CN (1) | CN117500766A (en) |
| TW (1) | TW202300456A (en) |
| WO (1) | WO2022264668A1 (en) |
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| JP3154786B2 (en) * | 1992-02-28 | 2001-04-09 | 住友大阪セメント株式会社 | Method for producing artificial aggregate for concrete and artificial aggregate for concrete |
| JPH06206743A (en) * | 1993-01-08 | 1994-07-26 | Kawasaki Steel Corp | Modification of steel-making slag |
| JP2000157094A (en) * | 1998-11-27 | 2000-06-13 | Nkk Corp | Stone material for sinking and disposing in water and its production |
| JP2004238234A (en) | 2003-02-04 | 2004-08-26 | Jfe Steel Kk | Air-granulated slag, method for producing the same, method for treating the same, and fine aggregate for concrete |
| CN101269920A (en) | 2007-03-23 | 2008-09-24 | 宝山钢铁股份有限公司 | Carbonatation processing method of steel scoria |
| JP5327184B2 (en) * | 2010-10-19 | 2013-10-30 | 新日鐵住金株式会社 | Steelmaking slag and method for producing the same |
| JP6260115B2 (en) | 2013-06-04 | 2018-01-17 | 新日鐵住金株式会社 | Carbonation treatment method for steelmaking slag |
| RU2743393C1 (en) | 2017-09-28 | 2021-02-17 | Арселормиттал | Method for continuous production of cured steel slude and related device |
| JP6822437B2 (en) * | 2018-04-06 | 2021-01-27 | Ｊｆｅスチール株式会社 | Heat recovery device for high temperature coagulated product and heat recovery method from high temperature coagulated product |
| JP7378213B2 (en) | 2018-07-11 | 2023-11-13 | 太平洋セメント株式会社 | Carbon dioxide fixation method |
| JP2020131074A (en) | 2019-02-14 | 2020-08-31 | 太平洋セメント株式会社 | Immobilization method of carbon dioxide |
| CN110982967B (en) | 2019-12-25 | 2022-02-11 | 江西理工大学 | Method and device for realizing steel slag quenching and waste heat recovery by using water and carbon dioxide |
| CN212451213U (en) | 2020-09-18 | 2021-02-02 | 中冶节能环保有限责任公司 | Method for capturing CO by using steel slag2Device for eliminating free CaO |
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| TW202300456A (en) | 2023-01-01 |
| KR20240006685A (en) | 2024-01-15 |
| JP7405263B2 (en) | 2023-12-26 |
| WO2022264668A1 (en) | 2022-12-22 |
| JPWO2022264668A1 (en) | 2022-12-22 |
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