CN118388165A - Additive for improving carbon fixation amount and activity of steel slag-based carbonized cementing material and application method of additive - Google Patents
Additive for improving carbon fixation amount and activity of steel slag-based carbonized cementing material and application method of additive Download PDFInfo
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- CN118388165A CN118388165A CN202410393166.8A CN202410393166A CN118388165A CN 118388165 A CN118388165 A CN 118388165A CN 202410393166 A CN202410393166 A CN 202410393166A CN 118388165 A CN118388165 A CN 118388165A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 99
- 239000010959 steel Substances 0.000 title claims abstract description 99
- 239000002893 slag Substances 0.000 title claims abstract description 98
- 239000000654 additive Substances 0.000 title claims abstract description 88
- 230000000996 additive effect Effects 0.000 title claims abstract description 86
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 48
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000000463 material Substances 0.000 title claims abstract description 23
- 230000000694 effects Effects 0.000 title abstract description 35
- 238000002360 preparation method Methods 0.000 claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 24
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 10
- 239000002253 acid Substances 0.000 claims abstract description 9
- 239000002904 solvent Substances 0.000 claims abstract description 4
- 238000003763 carbonization Methods 0.000 claims description 116
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 42
- BJEPYKJPYRNKOW-UHFFFAOYSA-N malic acid Chemical compound OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 17
- 235000011090 malic acid Nutrition 0.000 claims description 12
- 229920002125 Sokalan® Polymers 0.000 claims description 7
- 239000004584 polyacrylic acid Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 5
- 239000003575 carbonaceous material Substances 0.000 claims 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 abstract description 30
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 abstract description 15
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 abstract description 15
- 229910000027 potassium carbonate Inorganic materials 0.000 abstract description 15
- 238000004064 recycling Methods 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 27
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 17
- 238000003756 stirring Methods 0.000 description 13
- 239000000203 mixture Substances 0.000 description 12
- 230000009286 beneficial effect Effects 0.000 description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 7
- 235000011054 acetic acid Nutrition 0.000 description 5
- 125000004432 carbon atom Chemical group C* 0.000 description 5
- 230000000536 complexating effect Effects 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000000395 magnesium oxide Substances 0.000 description 4
- 235000011181 potassium carbonates Nutrition 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- 230000009919 sequestration Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 238000010668 complexation reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229960001484 edetic acid Drugs 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Chemical group 0.000 description 1
- 239000002184 metal Chemical group 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an additive for improving the carbon fixation amount and activity of a steel slag-based carbonized cementing material and a use method thereof, belonging to the technical field of building materials. The additive of the invention comprises the following raw materials in parts by weight: 1-5 parts of disodium ethylenediamine tetraacetate, 1-10 parts of potassium carbonate, 1-5 parts of polycarboxylic acid and 80-98 parts of solvent, the additive obtained by adopting the preparation raw material can effectively improve the carbon fixation amount, the activity index and the stability of the steel slag by only adding a small amount, and can be widely used for carbon dioxide sealing and steel slag recycling. In addition, the preparation method of the additive is simple, complex and tedious operation is not needed, the cost of raw materials is low, the safety is high, and the additive is suitable for industrial production.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to an additive for improving the carbon fixation amount and activity of a steel slag-based carbonized cementing material and a use method thereof.
Background
Related researches show that the CO 2 can be permanently stored in the form of carbonate directly by utilizing the accelerated carbonation of alkaline industrial solid wastes such as steel slag and the like containing free calcium oxide, free magnesium oxide and the like, and the carbonation is beneficial to improving the volume stability of the steel slag, so that the recycling utilization rate of the steel slag is greatly improved, and the dual purposes of carbon dioxide sequestration and recycling utilization of the steel slag are realized. However, most of steel enterprises in China are difficult to effectively capture carbon dioxide at present, and the problem of low carbon dioxide capture efficiency exists.
Based on the above, how to increase the carbon dioxide capturing rate and increase the carbon fixation amount of the steel slag becomes a technical problem to be solved urgently.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the additive for improving the carbon fixation amount and the activity of the steel slag-based carbonized cementing material, and the additive can effectively improve the carbon fixation amount, the activity index and the stability of the steel slag.
The invention also provides a preparation method of the additive.
The invention also provides a steel slag carbon fixing method.
The invention also provides a steel slag carbonized cementing material.
The invention also provides application of the additive in preparation of solid carbon gel materials or fixation of carbon dioxide.
In a first aspect of the present invention, there is provided an admixture, the preparation raw materials comprising, in parts by weight:
the additive according to the embodiment of the invention has at least the following beneficial effects:
(1) The additive provided by the invention consists of disodium ethylenediamine tetraacetate, potassium carbonate, polycarboxylic acid and a solvent, and can improve the dissolution of Ca 2+ through the complexation of polar groups such as hydroxyl, carboxyl and the like, thereby accelerating the carbonization rate of steel slag.
(2) The disodium ethylenediamine tetraacetate added in the additive can be directly dissolved in water to form a coordination system, and the coordination system and the polycarboxylic acid cooperate to promote the complex reaction with metal ions in the steel slag, so that the stability and carbon fixing performance of the steel slag are improved. In addition, the combination of the polycarboxylic acid and the disodium ethylenediamine tetraacetate is also beneficial to improving the viscosity and the fluidity of the steel slag, so that the steel slag is easier to wrap and fix carbon elements, and the carbon fixation amount is improved.
(3) The complexing component (such as disodium ethylenediamine tetraacetate, potassium carbonate and polybasic carboxylic acid) provided by the invention can reach a significant improvement level in carbon fixation amount and activity index by adding a small amount (about 0.5% -1.5% of the weight of the steel slag), for example, compared with undoped carbon fixation amount, the complexing component can improve the 3d activity index of the steel slag by 20% -40%, the 28d activity index can improve by 5% -17%, and the 28d activity index can improve by 5% -10%, and meanwhile, the stability of the steel slag is ensured to be qualified.
In some embodiments of the invention, the polycarboxylic acid is selected from at least one or two of acetic acid, 2-hydroxysuccinic acid, polyacrylic acid.
In some embodiments of the present invention, the preparation raw materials include, in parts by weight:
in some embodiments of the invention, the solvent comprises water.
In some embodiments of the present invention, the preparation raw materials include, in parts by weight:
The 2-hydroxy succinic acid is used as an organic acid containing hydroxyl and carboxyl, has better complexing performance compared with polyacrylic acid, can form a stable complex with metal ions, further reduces the activity of the metal ions, and is beneficial to improving the stability and carbon fixing performance of steel slag. The polyacrylic acid is a high molecular compound, has stronger adsorption capacity and cohesiveness, and is beneficial to improving the capture of CO 2 by improving the fluidity and viscosity of steel slag in the carbon fixing process, so that the carbon fixing effect is improved.
In some embodiments of the invention, the admixture is used for CO 2 capture and sequestration.
In a second aspect of the present invention, there is provided a method for producing the admixture according to the first aspect, wherein the admixture is produced by mixing raw materials for producing the admixture.
The preparation method provided by the embodiment of the invention has at least the following beneficial effects: the additive disclosed by the invention is simple in preparation process, free from complex and complicated operation, low in cost and high in safety.
According to a third aspect of the invention, a steel slag carbon fixing method is provided, wherein the additive in any one of the first aspect is contacted with steel slag, and the steel slag carbon fixing method is performed after carbonization treatment.
In some embodiments of the invention, the mass ratio of the admixture to the steel slag is 1:3 to 8; preferably, the mass ratio of the additive to the steel slag is 1:3 to 6.
In some embodiments of the invention, the steel slag comprises 35％～42％ CaO、25％～30％ Fe2O3、10％～15％SiO2、5％～8％ MgO、3～6％％Al2O3、3％～4％ MnO and 1-2% P 2O5.
In some embodiments of the invention, the steel slag comprises 38％～40％ CaO、27％～30％ Fe2O3、12％～15％SiO2、5％～8％ MgO、3％～5％ Al2O3、3％～4％ MnO and 1-2% P 2O5.
In some embodiments of the invention, the specific surface area of the steel slag is 300-400 m 2/kg.
In some embodiments of the invention, the carbonization treatment is at a temperature of 30 to 70 ℃.
The carbonization temperature range is favorable for effectively combining carbon atoms and metal atoms, and the carbon fixation amount is improved. Above this temperature, the amount of carbon fixation decreases because, at high temperatures, although the carbonization reaction is fast, excessive carbonization or formation of isolated carbides may occur, adversely affecting the carbon fixation effect.
In some embodiments of the invention, the carbonization treatment is for a period of time ranging from 0.5 to 2 hours. Preferably, the carbonization treatment is performed for 0.5 to 1 hour.
In some embodiments of the invention, the carbonization treatment is performed at a pressure of 0.02 to 0.04MPa.
In the carbonization pressure range, carbon atoms can more easily penetrate into the surface and the inside of the steel slag to form a uniform carbonization layer, thereby being beneficial to improving the carbon fixation amount. Below this pressure range, the gas molecule diffusion capacity is significantly reduced and it is often difficult for carbon atoms to effectively penetrate the surface or interior of the material; when the pressure is higher than the pressure range, excessive aggregation of carbon atoms is easily caused, large-particle carbide is formed, and the carbon fixing effect is adversely affected.
In some embodiments of the invention, the concentration of CO 2 in the carbonization process is 90% to 100%.
When the concentration of CO 2 is lower than the range, the carbonization reaction is slow due to insufficient carbon atom supply, so that an uneven carbonized layer is formed, and the improvement of the carbon fixation amount is not facilitated.
According to a fourth aspect of the invention, there is provided a steel slag carbonized gelling material, the raw materials for preparing which comprise the additive according to any one of the first aspects and steel slag.
In a fifth aspect of the invention there is provided the use of an admixture as defined in any one of the first aspects in the preparation of a solid carbon gelling material or in the fixation of carbon dioxide.
In some embodiments of the invention, the solid carbon gelling material comprises a steel slag carbonized gelling material.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values for the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range description features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to include any and all subranges subsumed therein.
In a specific embodiment of the invention, the steel slag is derived from a major component comprising about 39.20％ CaO、28.33％ Fe2O3、13.45％ SiO2、6.13％ MgO、4.59％ Al2O3、3.885％ MnO and 1.86% P 2O5; the specific surface area of the steel slag is 300-400 m 2/kg.
The term "about" in the present invention means that the allowable error is within + -2% unless otherwise specified.
Unless otherwise indicated, the term "room temperature" in the present invention means 25.+ -. 5 ℃.
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
The embodiment provides an additive for improving the carbon fixation amount and activity of a steel slag-based carbonized cementing material and a use method thereof. Wherein the additive comprises the following preparation raw materials in parts by weight as shown in table 1:
Table 1: example 1 Admixture Components
The application method of the additive comprises the following steps:
and step S1, fully mixing disodium ethylenediamine tetraacetate, potassium carbonate, acetic acid and water according to the parts by weight under the condition of room temperature to obtain an additive solution.
S2, adding steel slag according to the ratio of the mass of the additive solution to the mass of the steel slag of 1:5, uniformly stirring, and then placing the mixture into a carbonization kettle for carbonization, wherein the carbonization conditions are as follows: the carbonization temperature is 30-70 ℃, the carbonization pressure is 0.02-0.04 MPa, the carbonization time is 0.5-1.0 h, the concentration of CO 2 is 90-100%, and the finished product A is obtained after carbonization is completed.
Example 2
The embodiment provides an additive for improving the carbon fixation amount and activity of a steel slag-based carbonized cementing material and a use method thereof. Wherein the additive comprises the following preparation raw materials in parts by weight as shown in table 2:
table 2: example 2 additive component
The application method of the additive comprises the following steps:
And step S1, fully mixing disodium ethylenediamine tetraacetate, potassium carbonate, acetic acid, 2-hydroxysuccinic acid and water according to the parts by weight under the condition of room temperature to obtain an additive solution.
S2, adding steel slag according to the ratio of the mass of the additive solution to the mass of the steel slag of 1:5, uniformly stirring, and then placing the mixture into a carbonization kettle for carbonization, wherein the carbonization conditions are as follows: the carbonization temperature is 30-70 ℃, the carbonization pressure is 0.02-0.04 MPa, the carbonization time is 0.5-1.0 h, the concentration of CO 2 is 90-100%, and the finished product B is obtained after carbonization is completed.
Example 3
The embodiment provides an additive for improving the carbon fixation amount and activity of a steel slag-based carbonized cementing material and a use method thereof. Wherein the additive comprises the following preparation raw materials in parts by weight as shown in table 3:
Table 3: example 3 additive component
The application method of the additive comprises the following steps:
And step S1, fully mixing disodium ethylenediamine tetraacetate, potassium carbonate, acetic acid, 2-hydroxysuccinic acid and water according to the parts by weight under the condition of room temperature to obtain an additive solution.
S2, adding steel slag according to the ratio of the mass of the additive solution to the mass of the steel slag of 1:5, uniformly stirring, and then placing the mixture into a carbonization kettle for carbonization, wherein the carbonization conditions are as follows: the carbonization temperature is 30-70 ℃, the carbonization pressure is 0.02-0.04 MPa, the carbonization time is 0.5-1.0 h, the concentration of CO 2 is 90-100%, and the finished product C is obtained after carbonization is completed.
Example 4
The embodiment provides an additive for improving the carbon fixation amount and activity of a steel slag-based carbonized cementing material and a use method thereof. Wherein the additive comprises the following preparation raw materials in parts by weight as shown in table 4:
Table 4: example 4 additive component
The application method of the additive comprises the following steps:
And step S1, fully mixing disodium ethylenediamine tetraacetate, potassium carbonate, acetic acid, polyacrylic acid and water according to the parts by weight under the condition of room temperature to obtain an additive solution.
S2, adding steel slag according to the ratio of the mass of the additive solution to the mass of the steel slag of 1:5, uniformly stirring, and then placing the mixture into a carbonization kettle for carbonization, wherein the carbonization conditions are as follows: the carbonization temperature is 30-70 ℃, the carbonization pressure is 0.02-0.04 MPa, the carbonization time is 0.5-1.0 h, the concentration of CO 2 is 90-100%, and the finished product D is obtained after carbonization is completed.
Example 5
The embodiment provides an additive for improving the carbon fixation amount and activity of a steel slag-based carbonized cementing material and a use method thereof. Wherein the additive comprises the following preparation raw materials in parts by weight as shown in table 5:
Table 5: example 5 additive component
The application method of the additive comprises the following steps:
And step S1, fully mixing disodium ethylenediamine tetraacetate, potassium carbonate, acetic acid, 2-hydroxysuccinic acid and water according to the parts by weight under the condition of room temperature to obtain an additive solution.
S2, adding steel slag according to the ratio of the mass of the additive solution to the mass of the steel slag of 1:5, uniformly stirring, and then placing the mixture into a carbonization kettle for carbonization, wherein the carbonization conditions are as follows: the carbonization temperature is 30-70 ℃, the carbonization pressure is 0.02-0.04 MPa, the carbonization time is 0.5-1.0 h, the concentration of CO 2 is 90-100%, and the finished product E is obtained after carbonization is completed.
Example 6
The embodiment provides an additive for improving the carbon fixation amount and activity of a steel slag-based carbonized cementing material and a use method thereof. Wherein the additive comprises the following preparation raw materials in parts by weight as shown in table 6:
table 6: example 6 Admixture Components
The application method of the additive comprises the following steps:
And step S1, fully mixing disodium ethylenediamine tetraacetate, potassium carbonate, acetic acid, polyacrylic acid and water according to the parts by weight under the condition of room temperature to obtain an additive solution.
S2, adding steel slag according to the ratio of the mass of the additive solution to the mass of the steel slag of 1:5, uniformly stirring, and then placing the mixture into a carbonization kettle for carbonization, wherein the carbonization conditions are as follows: the carbonization temperature is 30-70 ℃, the carbonization pressure is 0.02-0.04 MPa, the carbonization time is 0.5-1.0 h, the concentration of CO 2 is 90-100%, and the finished product F is obtained after carbonization is completed.
Comparative example 1
This comparative example provides a method for sequestering carbon dioxide with steel slag, which differs from example 1 in that the admixture solution is replaced with an equal volume of water, the remainder being unchanged, comprising the specific steps of:
Adding steel slag into 100 parts of water, uniformly stirring, and then placing into a carbonization kettle for carbonization, wherein the carbonization conditions are as follows: the carbonization temperature is 30-70 ℃, the carbonization pressure is 0.02-0.04 MPa, the carbonization time is 0.5-1.0 h, the concentration of CO 2 is 90-100%, and the finished product G is obtained after carbonization is completed.
Comparative example 2
The comparative example provides an admixture for steel slag-based carbonization and a method of use thereof. Wherein the additive comprises the following preparation raw materials in parts by weight as shown in table 7:
Table 7: comparative example 2 Admixture component
The application method of the additive comprises the following steps:
And step S1, fully mixing potassium carbonate, acetic acid, 2-hydroxysuccinic acid and water according to the parts by weight under the condition of room temperature to obtain an additive solution.
S2, adding steel slag according to the ratio of the mass of the additive solution to the mass of the steel slag of 1:5, uniformly stirring, and then placing the mixture into a carbonization kettle for carbonization, wherein the carbonization conditions are as follows: the carbonization temperature is 30-70 ℃, the carbonization pressure is 0.02-0.04 MPa, the carbonization time is 0.5-1.0H, the concentration of CO 2 is 90-100%, and the finished product H is obtained after carbonization is completed.
Comparative example 3
The comparative example provides an admixture for steel slag-based carbonization and a method of use thereof. Wherein the additive comprises the following preparation raw materials in parts by weight as shown in table 8:
Table 8: comparative example 3 Admixture component
The application method of the additive comprises the following steps:
And step S1, fully mixing disodium ethylenediamine tetraacetate, acetic acid, 2-hydroxysuccinic acid and water according to the parts by weight under the condition of room temperature to obtain an additive solution.
S2, adding steel slag according to the ratio of the mass of the additive solution to the mass of the steel slag of 1:5, uniformly stirring, and then placing the mixture into a carbonization kettle for carbonization, wherein the carbonization conditions are as follows: the carbonization temperature is 30-70 ℃, the carbonization pressure is 0.02-0.04 MPa, the carbonization time is 0.5-1.0 h, the concentration of CO 2 is 90-100%, and the finished product I is obtained after carbonization is completed.
Comparative example 4
The comparative example provides an admixture for steel slag-based carbonization and a method of use thereof. Wherein the additive comprises the following preparation raw materials in parts by weight as shown in table 9:
Table 9: comparative example 4 Admixture component
The application method of the additive comprises the following steps:
And step S1, fully mixing acetic acid, 2-hydroxysuccinic acid and water according to the parts by weight under the condition of room temperature to obtain an additive solution.
S2, adding steel slag according to the ratio of the mass of the additive solution to the mass of the steel slag of 1:5, uniformly stirring, and then placing the mixture into a carbonization kettle for carbonization, wherein the carbonization conditions are as follows: the carbonization temperature is 30-70 ℃, the carbonization pressure is 0.02-0.04 MPa, the carbonization time is 0.5-1.0 h, the concentration of CO 2 is 90-100%, and the finished product J is obtained after carbonization is completed.
Comparative example 5
The comparative example provides an admixture for steel slag-based carbonization and a method of use thereof. Wherein the additive comprises the following preparation raw materials in parts by weight as shown in table 10:
table 10: comparative example 5 Admixture component
The application method of the additive comprises the following steps:
and step S1, fully mixing disodium ethylenediamine tetraacetate, potassium carbonate and water according to the parts by weight under the condition of room temperature to obtain an additive solution.
S2, adding steel slag according to the ratio of the mass of the additive solution to the mass of the steel slag of 1:5, uniformly stirring, and then placing the mixture into a carbonization kettle for carbonization, wherein the carbonization conditions are as follows: the carbonization temperature is 30-70 ℃, the carbonization pressure is 0.02-0.04 MPa, the carbonization time is 0.5-1.0 h, the concentration of CO 2 is 90-100%, and the finished product K is obtained after carbonization is completed.
Comparative example 6
The comparative example provides an admixture for steel slag-based carbonization and a method of use thereof. Wherein the additive comprises the following preparation raw materials in parts by weight as shown in table 11:
Table 11: comparative example 6 Admixture component
The application method of the additive comprises the following steps:
And step S1, fully mixing disodium ethylenediamine tetraacetate, potassium carbonate, acetic acid, 2-hydroxysuccinic acid and water according to the parts by weight under the condition of room temperature to obtain an additive solution.
S2, adding steel slag according to the ratio of the mass of the additive solution to the mass of the steel slag of 1:5, uniformly stirring, and then placing the mixture into a carbonization kettle for carbonization, wherein the carbonization conditions are as follows: the carbonization temperature is 30-70 ℃, the carbonization pressure is 0.02-0.04 MPa, the carbonization time is 0.5-1.0 h, the concentration of CO 2 is 70%, and the finished product L is obtained after carbonization is completed.
Comparative example 7
The comparative example provides an admixture for steel slag-based carbonization and a method of use thereof. Wherein the additive comprises the following preparation raw materials in parts by weight as shown in table 12:
table 13: comparative example 7 Admixture component
The application method of the additive comprises the following steps:
And step S1, fully mixing ethylene diamine tetraacetic acid, potassium carbonate, acetic acid, 2-hydroxysuccinic acid and water according to the parts by weight under the condition of room temperature to obtain an additive solution.
S2, adding steel slag according to the ratio of the mass of the additive solution to the mass of the steel slag of 1:5, uniformly stirring, and then placing the mixture into a carbonization kettle for carbonization, wherein the carbonization conditions are as follows: the carbonization temperature is 30-70 ℃, the carbonization pressure is 0.02-0.04 MPa, the carbonization time is 0.5-1.0 h, the concentration of CO 2 is 90-100%, and the finished product M is obtained after carbonization is completed.
Test case
The carbon fixation amount, 3d activity, 28d activity and stability of the finished products A to M prepared by using the additives of examples 1 to 6 and comparative examples 1 to 7 were measured. Wherein:
the carbon fixation amount is expressed as the loss on ignition at 600 ℃ and 900 ℃, wherein the treatment at 600 ℃ aims at removing water in the finished product;
the detection method of the 3d and 28d activities refers to GB/T51003-2014 technical Specification for mineral admixture application;
The method for detecting the stability refers to GB/T1346 2011 water consumption, setting time and stability of cement standard consistence.
The test results are shown in Table 14.
Table 14: carbon fixation and physical Properties of examples and comparative examples
The detection results show that compared with comparative example 1 (only water is doped), the additives prepared in examples 1, 2, 3, 4, 5, 6 and 7 of the invention can obviously improve the carbon fixation amount, 3d and 28d activity index of the steel slag, ensure that the steel slag is qualified in stability, and show good application effects. Wherein, the carbon fixation amount of the steel slag doped with the additive of the embodiment 3 of the invention is improved by 38.15 percent, the 3d activity index is improved by 16.76 percent and the 28d activity index is improved by 10.63 percent compared with the comparative example 1.
Further, as can be seen from comparison of comparative examples 2, 3, 4 and 5 of the present invention, the admixture of the present invention requires co-action of disodium edetate, potassium carbonate, polycarboxylic acid and water to obtain superior carbon sequestration amount of steel slag, 3d and 28d activity index. As can be seen from comparative example 6, when the concentration of carbon dioxide is reduced during carbonization of the steel slag to which the admixture is added, the carbon fixation amount is reduced, and the 3d and 28d activity indexes are also significantly reduced, presumably related to the non-uniformity of the carbonized layer caused by insufficient supply of carbon atoms. In addition, the present inventors found that when the main component of the admixture of the present invention is replaced with ethylenediamine tetraacetic acid, the carbon fixation amount of the steel slag is also significantly reduced, presumably in connection with complexation.
In summary, the invention provides an additive for improving the carbon fixation amount and activity of a steel slag-based carbonized cementing material and a use method thereof, wherein the additive mainly comprises disodium ethylenediamine tetraacetate, potassium carbonate, an auxiliary complexing component and water, the auxiliary complexing component is polycarboxylic acid, and the polycarboxylic acid is at least one selected from acetic acid, 2-hydroxysuccinic acid and polyacrylic acid. In addition, the invention also provides an application of the admixture in steel slag carbonization, which specifically comprises the steps of firstly compounding the admixture components, mixing the admixture components with water to form liquid, then mixing the liquid with steel slag, and carbonizing to obtain the steel slag-based carbonized cementing material. According to the comparison experiment, when the mixing amount of the additive is 0.5-1.5% of the weight of the steel slag, the carbon fixation amount of the steel slag is improved by 20-40% compared with that of the steel slag when only water is mixed (comparative example 1), the 3d activity index of the steel slag is improved by 5-17%, the 28d activity index is improved by 5-10%, and meanwhile, the stability of the steel slag is ensured to be qualified.
While the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Claims (10)
1. The additive is characterized by comprising the following preparation raw materials in parts by weight:
2. the admixture of claim 1, wherein the polycarboxylic acid is selected from at least one or two of acetic acid, 2-hydroxysuccinic acid, polyacrylic acid.
3. The additive according to claim 2, wherein the preparation raw materials comprise, in parts by weight:
4. An admixture according to any one of claims 1 to 3, wherein the solvent comprises water.
5. The method of producing an admixture according to any one of claims 1 to 4, wherein the admixture is produced by mixing raw materials for producing the admixture.
6. A method for solidifying carbon in steel slag, which is characterized in that the additive in any one of claims 1-4 is contacted with steel slag and carbonized.
7. The method for solidifying carbon from steel slag according to claim 6, wherein the carbonization treatment temperature is 30-70 ℃;
and/or the carbonization treatment time is 0.5-2 h;
and/or the pressure of the carbonization treatment is 0.02-0.04 MPa;
And/or, the concentration of CO 2 in the carbonization treatment is 90-100%.
8. A steel slag carbonized gelling material, characterized in that the raw materials for preparation comprise the admixture according to any one of claims 1-4 and steel slag.
9. Use of an admixture according to any one of claims 1 to 4 for the preparation of a solid carbon gel material or for the fixation of carbon dioxide.
10. The use according to claim 9, wherein the solid carbonaceous material comprises steel slag carbonized cementitious material.
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| CN202410393166.8A CN118388165A (en) | 2024-04-02 | 2024-04-02 | Additive for improving carbon fixation amount and activity of steel slag-based carbonized cementing material and application method of additive |
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