Carbon dioxide fixation composition

Abstract

The purpose of the present invention is to provide a carbon dioxide fixation composition that can improve how much or how fast carbon dioxide is fixed. The present invention is a carbon dioxide fixation composition that includes: a powder that includes a calcium-containing compound; and a polyamine.

Description

Composition for carbon dioxide fixation

[0001] The present invention relates to a composition for carbon dioxide fixation. More specifically, the present invention relates to a composition for carbon dioxide fixation in the cement industry. ２ The present invention relates to a composition for fixing carbon dioxide that is useful for reducing emissions.

[0002] CO emissions from the cement industry ２ The amount is the CO emitted by all industries ２ CO emissions from the cement industry account for about 8% of the total CO emissions. ２ Reducing the amount of CO is an important issue. ２ As one of the main measures to reduce emissions, we are utilizing the calcium components contained in ready-mix concrete, returned concrete, waste concrete, etc. to reduce the CO emitted during cement production. ２ Technological developments are underway to re-fix carbon dioxide as calcium carbonate. For example, Patent Document 1 discloses a method for immobilizing carbon dioxide, which comprises contacting carbon dioxide with an aqueous solution of monoethanolamine and then adding a calcium salt or an aqueous solution of a calcium salt to the aqueous solution to generate calcium carbonate in the aqueous solution and immobilizing carbon dioxide in the aqueous solution. Furthermore, Patent Document 2 discloses a method for manufacturing a cement admixture, which includes a slurrying step of heat-treating fresh concrete sludge or fine waste concrete powder and then mixing it with water to form a slurry, and a carbonation step of passing carbon dioxide gas through the slurry to carbonate it.

[0003] JP 2012-131697 A JP 2021-138574 A

[0004] As mentioned above, various methods for fixing carbon dioxide have been developed. ２ To achieve this reduction effect, it is necessary to improve the amount and speed of carbon dioxide fixation.

[0005] The present invention has been made in view of the above-mentioned current situation, and an object of the present invention is to provide a composition for carbon dioxide fixation that can improve the amount or fixation rate of carbon dioxide.

[0006] The present inventors have conducted extensive research into compositions used for carbon dioxide fixation and have found that the amount of carbon dioxide fixation can be improved by adding a polyamine to a powder containing a calcium-containing compound. They have also found that the rate of carbon dioxide fixation can be improved by adding at least one amine selected from the group consisting of secondary amines and tertiary amines having a molecular weight of 600 or less to a powder containing a calcium-containing compound. These findings led to the realization that the above-mentioned problems can be successfully solved, and have led to the present invention.

[0007] The present invention encompasses the following compositions for fixing carbon dioxide, etc. [1] A composition for fixing carbon dioxide, comprising a powder containing a calcium-containing compound and a polyamine. [2] The composition for fixing carbon dioxide according to [1] above, wherein the polyamine is a polyalkyleneimine. [3] The composition for fixing carbon dioxide according to [1] above, wherein the polyamine is polyethyleneimine. [4] The composition for fixing carbon dioxide according to [1] or [2] above, wherein the polyamine has a weight-average molecular weight of 600 or more. [5] A composition for fixing carbon dioxide, comprising a powder containing a calcium-containing compound and at least one amine selected from the group consisting of a secondary amine and a tertiary amine having a molecular weight of 600 or less. [6] The composition for fixation of carbon dioxide according to [5] above, which contains at least one selected from the group consisting of N-propylethanolamine, isopropylethanolamine, n-butylethanolamine, 2-methylpiperazine, dimethylaminoethanol, 1-dimethylamino-2-propanol, diethylaminoethanol, 3-diethylamino-1-propanol, tetramethylethylenediamine, and pentamethyldiethylenetriamine. [7] The composition for fixation of carbon dioxide according to any of [1] to [6] above, wherein the powder containing a calcium-containing compound contains at least one selected from the group consisting of cement, concrete sludge, and waste concrete. [8] A method for fixation of carbon dioxide, which comprises a step of passing carbon dioxide through the composition for fixation of carbon dioxide according to any of [1] to [7] above. [9] The method for fixation of carbon dioxide according to [8] above, which does not include a step of heat-treating the powder containing a calcium-containing compound at a temperature in the range of 100°C to 300°C.

[10] An additive used to produce the carbon dioxide fixation composition according to any one of [1] to [7] above, comprising at least one selected from the group consisting of polyamines, secondary amines and tertiary amines having a molecular weight of 600 or less.

[0008] The carbon dioxide fixation composition of the present invention has the above-mentioned constitution, and is useful for improving the amount and speed of fixation of carbon dioxide in the cement industry. ２This composition contributes to reducing carbon dioxide emissions. Furthermore, by recovering the composition for carbon dioxide fixation, it can be reused for carbon dioxide fixation.

[0009] Preferred embodiments of the present invention will be specifically described below, but the present invention is not limited to the following description and can be appropriately modified and applied within the scope of the present invention. A combination of two or more of the individual preferred embodiments of the present invention described below also falls within the scope of the present invention. Furthermore, when the term "the present invention" is used simply in this specification, it refers to matters common to the first and second inventions.

[0010] <Composition for Fixing Carbon Dioxide of the First Invention> The composition for fixating carbon dioxide of the first invention contains a powder containing a calcium-containing compound and a polyamine. The polyamine may be a compound having two or more nitrogen atom-containing groups selected from the group consisting of a primary amino group, a secondary amino group, a tertiary amino group, a quaternary ammonium group, and an imino group, and is preferably a compound represented by the following general formula (1):

[0011]

[0012] In general formula (1), R １ are the same or different and represent a linear alkylene group having 2 to 6 carbon atoms or a branched alkylene group having 3 to 6 carbon atoms. P is the same or different and represents a hydrogen atom or a structural unit having another amino group due to branching. a, b, and c are the same or different and represent an integer of 0 or 1 or more, and the sum of a, b, and c is 1 or more.

[0013] When P in the general formula (1) is a structural unit having another amino group, the structural unit having another amino group is preferably represented by the following general formula (2), and R １’ It is preferred that the bond to the structure represented by formula (1) is via a group.

[0014]

[0015] (In general formula (2), a', b', c', P', R １’ are a, b, c, P, and R in general formula (1), respectively. １(Similar to the above.)

[0016] The polyamine is preferably a polyethylene polyamine such as diethylenetriamine, triethylenetetramine, or tetraethylenepentamine, tetrabutylenepentamine, polyethyleneimine, polyamidoamine, polyvinylamine, or polyallylamine, more preferably tetraethylenepentamine or polyethyleneimine, and even more preferably polyethyleneimine.

[0017] The weight-average molecular weight of the polyamine is not particularly limited, but is preferably 600 or more. The weight-average molecular weight of the polyamine is preferably 1,000,000 or less, more preferably 600 to 100,000, and even more preferably 600 to 10,000. The weight-average molecular weight of the polyamine can be measured by molecular weight measurement (GPC analysis) under the conditions described in the Examples.

[0018] The content of the polyamine in the composition for fixation of carbon dioxide is not particularly limited, but is preferably 0.1 to 10% by mass, more preferably 0.3 to 5.0% by mass, and even more preferably 1.0 to 5.0% by mass, relative to 100% by mass of the powder containing the calcium-containing compound.

[0019] The calcium-containing compound is not particularly limited as long as it contains calcium element, and examples thereof include calcium hydroxide, calcium oxide, calcium carbonate, dicalcium silicate, tricalcium aluminate, tetracalcium aluminoferrate, calcium sulfate, calcium nitrate, calcium chloride, calcium phosphate, calcium formate, calcium acetate, calcium lactate, etc. Among these, those containing calcium hydroxide and calcium oxide are preferred.

[0020] The powder containing the calcium-containing compound preferably contains 0.01% by mass or more of calcium hydroxide or 5% by mass or more of unhydrated cement, and 20% by mass or less of calcium carbonate. Because calcium hydroxide reacts with carbon dioxide to form calcium carbonate, and the amount of adsorbed carbon dioxide increases with an increase in the amount of unhydrated cement, the amount of fixed carbon dioxide increases when these components are within the above ranges.

[0021] Specific examples of the powder containing the calcium-containing compound include Portland cement (normal, early strength, extra early strength, medium heat, sulfate resistant, and their respective low alkali types); various blended cements (blast furnace cement, silica cement, fly ash cement); white Portland cement; alumina cement; ultra-fast hardening cement (1 clinker fast hardening cement, 2 clinker fast hardening cement, magnesium phosphate cement); cement for grout; oil well cement; low heat cement (low heat type blast furnace cement, fly ash mixed low heat type blast furnace cement) Examples of such cements include cements such as ash from municipal waste incineration ash and sewage sludge incineration ash, and high-belite cements; ultra-high-strength cements; cement-based solidification materials; ecocement (cement produced using one or more of municipal waste incineration ash and sewage sludge incineration ash as raw materials); hydraulic powders such as those obtained by adding gypsum or fine powders such as blast furnace slag, fly ash, cinder ash, clinker ash, husk ash, silica fume, silica powder, and limestone powder to these; concrete sludge, waste concrete, waste mortar, residual concrete, and returned concrete, and one or more of these may be used.

[0022] The powder containing the calcium-containing compound preferably contains at least one selected from the group consisting of cement, concrete sludge, and waste concrete, and more preferably consists of cement and / or waste concrete. When concrete sludge or waste concrete is used as the powder containing the calcium-containing compound, the mass ratio of calcium oxide (CaO) to silicon dioxide (CaO / SiO ) in calcium silicate hydrate, which is a cement hydrate contained in the powder, is preferably 0.05 to 0.05, from the viewpoint of increasing the amount of fixed carbon dioxide. ２Specifically, it is preferably 0.5 or more, more preferably 1.0 or more, and even more preferably 1.5 or more. However, as long as CaO is contained, the CaO / SiO ２ Regardless of the ratio, carbon dioxide can be immobilized as calcium carbonate.

[0023] The particle size of the powder containing the calcium-containing compound is not particularly limited, but the maximum particle size is preferably 30 cm or less, more preferably 1 cm or less, even more preferably 1 mm or less, and particularly preferably 500 μm or less.

[0024] The content of the powder containing a calcium-containing compound in the carbon dioxide fixation composition is preferably 1 to 99.9 mass%, more preferably 10 to 99.9 mass%, and even more preferably 50 to 99.9 mass%, relative to 100 mass% of the composition.

[0025] The carbon dioxide fixation composition may contain the powder containing the calcium-containing compound and a polyamine, but preferably contains a solvent. The solvent is not limited as long as it allows the calcium-containing compound to react with carbon dioxide, but water or a mixed solvent of water and an organic solvent is preferred. When the solvent is the mixed solvent, the proportion of the organic solvent is preferably 50% by mass or less, more preferably 20% by mass or less, relative to 100% by mass of the mixed solvent.

[0026] Examples of the organic solvent include alcohols such as methyl alcohol, ethyl alcohol, and isopropyl alcohol; aromatic or aliphatic hydrocarbons such as benzene, toluene, xylene, cyclohexane, and n-hexane; ester compounds such as ethyl acetate; ketone compounds such as acetone and methyl ethyl ketone; and cyclic ether compounds such as tetrahydrofuran and dioxane. Among the organic solvents, hydrophilic solvents such as alcohols are preferred.

[0027] The amount of the solvent in the composition for fixation of carbon dioxide is not particularly limited, but is preferably 1 to 10,000% by mass, more preferably 30 to 5,000% by mass, and even more preferably 100 to 3,000% by mass, relative to 100% by mass of the powder containing the calcium-containing compound.

[0028] The carbon dioxide fixation composition may be any composition as long as it contains the powder containing the calcium-containing compound and a polyamine, but is preferably in the form of a slurry.

[0029] <Composition for Fixing Carbon Dioxide of the Second Invention> The composition for fixating carbon dioxide of the second invention contains a powder containing a calcium-containing compound and at least one amine selected from the group consisting of a secondary amine having a molecular weight of 600 or less and a tertiary amine having a molecular weight of 600 or less. The composition for fixating carbon dioxide of the second invention is the same as the composition for fixating carbon dioxide of the first invention, except that the composition for fixating carbon dioxide of the second invention contains at least one amine selected from the group consisting of a secondary amine and a tertiary amine having a molecular weight of 600 or less, instead of a polyamine.

[0030] The secondary amine and tertiary amine are not particularly limited as long as they have a molecular weight of 600 or less, and examples thereof include N-methylethanolamine, N-ethylethanolamine, N-propylethanolamine (2-(propylamino)ethanol), isopropylethanolamine (2-(isopropylamino)ethanol), n-butylethanolamine (2-(butylamino)ethanol), 2-methylpiperazine, 2-dimethylaminoethanol, 1-dimethylamino-2-propanol, diethylaminoethanol, 3-diethylamino-1-propanol, N,N,N ’ , N ’ -Tetramethylethylenediamine, N-ethyldiethanolamine, triisopropanolamine, N-methyldiethanolamine, t-butyldiethanolamine, N,N,N ’ , N ’’ , N ’’ -pentamethyldiethylenetriamine, etc.

[0031] The secondary amines and tertiary amines may have a functional group such as a hydroxyl group, but the number of functional groups per molecule is preferably one or less, and more preferably one or less, of hydroxyl groups per molecule. Among the secondary amines and tertiary amines, N-propylethanolamine, isopropylethanolamine, n-butylethanolamine, 2-methylpiperazine, 2-dimethylaminoethanol, 1-dimethylamino-2-propanol, diethylaminoethanol, 3-diethylamino-1-propanol, N,N,N ’ , N ’ -Tetramethylethylenediamine and N,N,N ’ , N ’’ , N ’’ Preferred are N-pentamethyldiethylenetriamine, N-ethylethanolamine, etc. More preferred are N-propylethanolamine, isopropylethanolamine, 2-dimethylaminoethanol, 1-dimethylamino-2-propanol, diethylaminoethanol, 3-diethylamino-1-propanol, N,N,N ’ , N ’ -Tetramethylethylenediamine and N,N,N ’ , N ’’ , N ’’ - Pentamethyldiethylenetriamine.

[0032] The molecular weight of the secondary amine and tertiary amine is not particularly limited as long as it is 600 or less, but is preferably 500 or less, more preferably 300 or less, even more preferably 250 or less, and particularly preferably 200 or less. The molecular weight of the secondary amine and tertiary amine is preferably 70 or more.

[0033] The total content of the secondary amine and the tertiary amine in the composition for fixation of carbon dioxide is not particularly limited, but is preferably 0.01 to 20 mass%, more preferably 0.1 to 10 mass%, and even more preferably 0.5 to 5.0 mass%, based on 100 mass% of the powder containing the calcium-containing compound.

[0034] <Method for Fixing Carbon Dioxide> The composition for fixation of carbon dioxide of the present invention can be suitably used for fixation of carbon dioxide. The present invention also relates to a method for fixation of carbon dioxide, which includes a step of passing carbon dioxide through the composition for fixation of carbon dioxide of the present invention (hereinafter also referred to as a carbonation step). The preferred form of the composition for fixation of carbon dioxide used in the method for fixation of carbon dioxide is the same as that of the composition for fixation of carbon dioxide of the present invention.

[0035] The carbonation step is not particularly limited as long as carbon dioxide is passed through the carbon dioxide fixation composition, but it is preferable to contact a slurry-like carbon dioxide fixation composition with carbon dioxide gas. The amount of carbon dioxide gas passed through is not particularly limited, but is preferably 5 cc or more per minute per gram of powder containing a calcium-containing compound. This further improves the amount and fixation rate of carbon dioxide. The amount of carbon dioxide gas passed through is more preferably 10 cc or more per minute per gram of powder containing a calcium-containing compound, and even more preferably 20 cc or more per minute. Furthermore, the amount of carbon dioxide gas passed through is preferably 100 cc or less per minute per gram of powder containing a calcium-containing compound.

[0036] The time for passing carbon dioxide in the carbonation step is not particularly limited, but is preferably 0.01 to 24 hours, more preferably 0.01 to 7 hours, and even more preferably 0.5 to 4 hours.

[0037] The carbon dioxide is preferably passed through the carbon dioxide fixation composition in the carbonation step until the pH of the composition becomes 10 or less. This allows the amount of carbon dioxide fixed to be increased. More preferably, the carbon dioxide is passed through the composition until the pH becomes 9 or less, and even more preferably, until the pH becomes 8 or less.

[0038] The carbon dioxide fixation method is not particularly limited as long as it includes the carbonation step, but when the powder containing the calcium-containing compound in the carbon dioxide fixation composition is in the form of lumps, the method may include a step of pulverizing the lumps before the carbonation step. The pulverization method is not particularly limited, and pulverizers commonly used in cement factories, etc., such as hammer crushers, roll crushers, jaw crushers, vertical mills, ball mills, rod mills, and disc mills, can be used.

[0039] The above-mentioned carbon dioxide fixation method preferably does not include a step of heat-treating the powder containing a calcium-containing compound in the composition for fixation of carbon dioxide at a temperature range of 100° C. to 300° C. However, the above-mentioned heating step does not include a step of burning raw materials for producing clinker when producing the powder containing the calcium-containing compound.

[0040] In the above-mentioned method for immobilizing carbon dioxide, calcium carbonate is produced by passing carbon dioxide through a carbon dioxide fixation composition. A method for producing calcium carbonate, which includes a step of passing carbon dioxide through the carbon dioxide fixation composition of the present invention, also constitutes the present invention. Furthermore, a method for producing carbon dioxide fixation concrete, which includes a step of passing carbon dioxide through the carbon dioxide fixation composition of the present invention, also constitutes the present invention.

[0041] <Additives used to produce a composition for fixing carbon dioxide> The polyamine of the first invention and the secondary amine and tertiary amine having a molecular weight of 600 or less of the second invention can be suitably used as additives for producing a composition for fixing carbon dioxide. The present invention also relates to an additive that contains at least one selected from the group consisting of polyamines, secondary amines, and tertiary amines having a molecular weight of 600 or less and is used to produce a composition for fixing carbon dioxide. The polyamines, secondary amines, and tertiary amines having a molecular weight of 600 or less contained in the additive of the present invention are as described in the description of the composition for fixing carbon dioxide of the present invention.

[0042] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, "%" means "% by mass."

[0043] The molecular weight of the following polyamines was measured as follows. (Molecular Weight Measurement (GPC Analysis)) The weight-average molecular weight and number-average molecular weight in the present invention can be measured by a known method using gel permeation chromatography (GPC) with pullulan as a standard substance. The following conditions are adopted as the GPC measurement conditions in the present invention. Measuring apparatus: manufactured by Shimadzu Corporation Columns used: SHODEX OHpak SB-807HQ (two columns) + SB-806M / HQ (two columns) manufactured by Showa Denko Eluent: adjusted to 0.5 mol % sodium nitrate and 0.5 mol % acetic acid Standard substance: Pullulan P-82 (manufactured by Wako Pure Chemical Industries, Ltd.) Detector: differential refractometer (manufactured by Shimadzu Corporation) Flow rate: 0.4 ml / min.

[0044] (Experimental Equipment and Procedure) A composition was prepared by adding cement or crushed simulated waste concrete to a container, an additive (polyamine, secondary amine, or tertiary amine), and water. Carbon dioxide gas was then passed through the composition at room temperature for a predetermined time. The composition was then filtered to recover a powder, which was then dried. The weight loss rate of the resulting powder was measured using a TG-DTA device (device name: STA200 (manufactured by Hitachi High-Tech Science Corporation)), and the amount of calcium carbonate produced was calculated, thereby calculating the carbonation rate. Details are provided below. Cement: Unhydrated cement (ordinary Portland cement). Preparation of simulated crushed waste concrete: A cement paste with w / c = 0.4 was prepared (mixing method conforming to JIS R5201). The kneaded paste was packed into a formwork (Φ50 × 50 × 100 mm), and cured in air at 20°C for 3 days. After three days from pouring water, the formwork was removed and cured in water for 11 days. After curing, the hardened body was pulverized, and powder of 100 μm or less was collected using a sieve with an opening of 100 μm and used for the test. ２Injection Method: The powder was added to ion-exchanged water at a ratio of w / b = 10 (W: additives and water, B: crushed cement or waste concrete), and stirred at a constant speed using a stirring rod. When additives were used, they were added to the ion-exchanged water. The amount of polyamine added was 0.3, 1.0, or 5.0 wt% / B, and the amount of primary amine, secondary amine, and tertiary amine additives added was 0.1, 1.0, or 5.0 wt% / B. Carbon dioxide gas (manufactured by Sumitomo Seika Chemicals Co., Ltd.) was passed through the slurry at room temperature at a flow rate of 0.3 L / min for a predetermined period of time, after which the filtrate was filtered. The resulting powder was washed with acetone, dried at 40°C (under a nitrogen atmosphere) for 24 hours, and subjected to TG-DTA measurement. (Measurement of Calcium Carbonate Amount) The calcium carbonate amount was quantified using TG-DTA according to the following measurement method. Conditions: A heating rate of 20°C / min was used in a nitrogen atmosphere. Analysis: The mass loss measured by TG-DTA near 600 to 800°C was considered to be the decarbonation of calcium carbonate, and the amount of calcium carbonate was calculated. The carbonation rate was calculated as follows, with 100% being the rate when all of the calcium oxide in the cement or waste concrete had reacted with carbon dioxide. To quantify the amount of calcium oxide in the powder, the chemical composition of the ground cement or ground waste concrete was measured for the mass fraction of calcium element using an X-ray fluorescence analyzer (ZSX Primus II, manufactured by Rigaku Corporation) in accordance with JIS R 5202:2015 and JIS R 5204:2019 (X-ray fluorescence analysis of cement), and the mass fraction of calcium oxide was calculated based on this. The results are shown in Table 1. The mass fractions of calcium element and calcium oxide in the ground waste concrete were calculated after correction using the loss on ignition separately determined by TG-DTA.

[0045]

[0046] (Calculation formula for carbonation rate) Symbols are in parentheses and units are in square brackets. Maximum amount of fixed carbon dioxide (A) [g] = amount of calcium oxide in 1g of powder (B) [g] x m / n m: molecular weight of carbon dioxide [g / mol] n: molecular weight of calcium oxide [g / mol] Maximum weight loss rate (C) = (A) / (1 + (A)) x 100 [%] Carbonation rate (D) = weight loss rate / (C) x 100 [%] *Weight loss rate = mass loss at around 600-800°C as determined by TG-DTA When the carbonation rate (D0) without additives is taken to be 100%, the carbonation improvement rate (E) of a sample is: (E) = carbonation rate of sample (D1) / (D0) x 100 [%]

[0047] Examples (1)-(6) and Comparative Examples (1)-(2) As shown in Table 2 below, the carbonation rate was measured after a predetermined time (30 minutes, 1 hour, 4 hours) using the above-mentioned experimental apparatus and procedures, using polyamine and primary amine as additives. The results are shown in Table 2. The carbonation rate is shown as a ratio to the rate when no additives were added, and the final carbonation degree (amount of fixed carbon dioxide) was determined by the carbonation rate after 1 hour. Note that when the carbonation rate can be improved by 10% or more compared to the case when no additives were added, it can be said that the carbonation rate improvement effect is particularly excellent.

[0048]

[0049] Examples (7) to (17) and Comparative Examples (3) to (6) Using the primary amines, secondary amines, and tertiary amines shown in Table 3, the carbonation rate after 30 minutes was calculated using the experimental equipment and procedures described above. The results are shown in Table 3. The carbon dioxide gas injection time and stirring time were 30 minutes. The carbonation rate was also reported as a ratio to the case where no additives were added. Note that if the carbonation rate at 30 minutes can be improved by 10% or more compared to the case where no additives were added, it can be said that the carbonation rate improvement effect is particularly excellent.

[0050]

Claims

1. A composition for fixing carbon dioxide, comprising a powder containing a calcium-containing compound and a polyamine.

2. The composition for fixing carbon dioxide according to claim 1, wherein the polyamine is a polyalkyleneimine.

3. 2. The composition for fixing carbon dioxide according to claim 1, wherein the polyamine is polyethyleneimine.

4. 2. The composition for fixing carbon dioxide according to claim 1, wherein the polyamine has a weight-average molecular weight of 600 or more.

5. A composition for fixing carbon dioxide, comprising a powder containing a calcium-containing compound and at least one amine selected from the group consisting of secondary amines and tertiary amines having a molecular weight of 600 or less.

6. The carbon dioxide fixation composition according to claim 5, comprising at least one selected from the group consisting of N-propylethanolamine, isopropylethanolamine, n-butylethanolamine, 2-methylpiperazine, dimethylaminoethanol, 1-dimethylamino-2-propanol, diethylaminoethanol, 3-diethylamino-1-propanol, tetramethylethylenediamine, and pentamethyldiethylenetriamine.

7. 2. The composition for fixing carbon dioxide according to claim 1, wherein the powder containing a calcium-containing compound comprises at least one selected from the group consisting of cement, concrete sludge, and waste concrete.

8. A composition for fixing carbon dioxide as described in claim 5, wherein the powder containing the calcium-containing compound includes at least one type selected from the group consisting of cement, concrete sludge, and waste concrete.

9. A method for fixation of carbon dioxide, comprising a step of passing carbon dioxide through the composition for fixation of carbon dioxide according to any one of claims 1 to 8.

10. 10. The method for fixation of carbon dioxide according to claim 9, which does not include a step of heat-treating the powder containing the calcium-containing compound in a temperature range of 100°C to 300°C.

11. An additive used for producing the carbon dioxide fixation composition according to any one of claims 1 to 8, comprising at least one selected from the group consisting of polyamines, secondary amines and tertiary amines having a molecular weight of 600 or less.