CN116573910A - High-strength carbonized steel slag cementing material and preparation method thereof - Google Patents
High-strength carbonized steel slag cementing material and preparation method thereof Download PDFInfo
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- CN116573910A CN116573910A CN202310564183.9A CN202310564183A CN116573910A CN 116573910 A CN116573910 A CN 116573910A CN 202310564183 A CN202310564183 A CN 202310564183A CN 116573910 A CN116573910 A CN 116573910A
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- steel slag
- cementing material
- strength
- carbonized steel
- lifting agent
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 135
- 239000010959 steel Substances 0.000 title claims abstract description 135
- 239000002893 slag Substances 0.000 title claims abstract description 129
- 239000000463 material Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000003763 carbonization Methods 0.000 claims abstract description 55
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 41
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000000843 powder Substances 0.000 claims abstract description 28
- 239000000203 mixture Substances 0.000 claims abstract description 24
- YWYZEGXAUVWDED-UHFFFAOYSA-N triammonium citrate Chemical group [NH4+].[NH4+].[NH4+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O YWYZEGXAUVWDED-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000001509 sodium citrate Substances 0.000 claims abstract description 12
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims abstract description 12
- 238000010521 absorption reaction Methods 0.000 claims abstract description 7
- 210000001161 mammalian embryo Anatomy 0.000 claims abstract description 7
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 7
- 238000010000 carbonizing Methods 0.000 claims description 3
- 239000004566 building material Substances 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 16
- 239000007791 liquid phase Substances 0.000 description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 229910001424 calcium ion Inorganic materials 0.000 description 6
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 5
- 239000005539 carbonized material Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000002386 leaching Methods 0.000 description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- -1 ammonium ions Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- FNAQSUUGMSOBHW-UHFFFAOYSA-H calcium citrate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O FNAQSUUGMSOBHW-UHFFFAOYSA-H 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
- C04B28/082—Steelmaking slags; Converter slags
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The application relates to a high-strength carbonized steel slag cementing material and a preparation method thereof, which belong to the technical field of building materials and can improve the performance of carbonized steel slag blocks and CO resistance 2 Is a sealing quantity of the (c); the method comprises the following steps: s1, uniformly mixing a lifting agent and water to obtain a lifting agent solution; the lifting agent is ammonium citrate or ammonium citrate and H 2 SO 4 A mixture of at least one of citric acid, sodium citrate; s2, fully mixing the lifting agent solution and the steel slag powder to obtain a wet mixture; s3, pressing the wet mixture to obtain a blank; s4, placing the embryo body in a CO-rich state 2 Performing carbonization treatment in the environment of (1) to obtain carbonized steel slag cementing material; the compressive strength of the high-strength carbonized steel slag cementing material is 99-108MPa, and the CO content of each hundred grams of steel slag powder is higher than that of the high-strength carbonized steel slag cementing material 2 The absorption amount is 16.2-17g, and the porosity is 14.0-15.1%.
Description
Technical Field
The application relates to the technical field of building materials, in particular to a high-strength carbonized steel slag cementing material and a preparation method thereof.
Background
China is a main country for steel production, the annual steel production total amount of China is about 50% of the world production total amount at present, a large amount of steel production is accompanied with the generation of a large amount of steel slag, china is a main country for steel production, and also becomes a country for producing steel slag waste, the annual steel slag yield of China exceeds 1 hundred million tons in 2016 years, and the accumulated steel slag discharge amount of China reaches 7 hundred million tons in recent 10 years. Compared with other countries, the utilization rate of the Chinese steel slag is relatively low, and the value of the Chinese steel slag is lower than 30%. The large amount of steel slag is piled up and disposed, which wastes land and mineral resources and pollutes the environment, and enterprises also need to pay high environmental tax. At the same time as CO in steel plants 2 Is the main source of emissions from steel plants annually 2 The discharge amount accounts for the total CO 2 6-7% of emissions are next to power and cement plants.
At present, the application of the steel slag is mainly focused on the fields of road base fillers, cement production admixture and the like, mainly utilizes the hydraulic component (beta-C2S) contained in the steel slag, but does not fully exert the active component for generating strength in the steel slag. The gamma-C2S component in the steel slag has the largest proportion, but the component does not have water activity. Meanwhile, the gamma-C2S component has a strong carbonization activity and rapidly hardens in a short time, so that the current carbonized steel slag-made building materials are attracting great attention. The steel slag is also CO 2 The capturing and storing are an effective method, and the calcium component and CO in the steel slag 2 The reaction generates stable calcium carbonate, plays a role of permanently fixing carbon, and reduces CO 2 Emissions and greenhouse effect.
At present, a certain research result is achieved for producing low-grade steel slag bricks by steel slag carbonization, but the surface layer of a steel slag product is densified prematurely due to the reaction characteristic of carbonization from outside to inside, so that CO is limited 2 Transmission into the interior of the article results in a greater degree of internal reactionLow in cost, and can reduce the mechanical property of steel slag product and limit the application field.
Accordingly, there is a need to develop a high strength carbonized steel slag cement and a method of preparing the same to address the deficiencies of the prior art, to solve or alleviate one or more of the above-mentioned problems.
Disclosure of Invention
In view of the above, the application provides a high-strength carbonized steel slag cementing material and a preparation method thereof, which can improve the performance of carbonized steel slag blocks and the performance of the carbonized steel slag blocks on CO 2 Is a sealing amount of (a).
In one aspect, the application provides a method for preparing a high-strength carbonized steel slag cementing material, which comprises the following steps:
s1, uniformly mixing a lifting agent and water to obtain a lifting agent solution;
the lifting agent is ammonium citrate or ammonium citrate and H 2 SO 4 A mixture of at least one of citric acid, sodium citrate;
s2, fully mixing the lifting agent solution and the steel slag powder to obtain a wet mixture;
s3, pressing the wet mixture to obtain a blank;
s4, placing the embryo body in a CO-rich state 2 And (3) carbonizing the steel slag in the environment to obtain the carbonized steel slag cementing material.
In the aspects and any possible implementation manner, there is further provided an implementation manner, wherein the adding amount of the lifting agent accounts for 0.1-2.0wt% of the steel slag powder.
In aspects and any one of the possible implementations described above, there is further provided an implementation in which the mass ratio of the lift agent solution to the steel slag powder is 1:5-10.
In aspects and any one of the possible implementations described above, there is further provided an implementation where, when the lifting agent is the mixture, H 2 SO 4 The mass ratio of the citric acid and/or sodium citrate to the ammonium citrate is 0-1:3, and the mass ratio of the citric acid and/or sodium citrate to the ammonium citrate is 0-1:2.
In the aspect and any possible implementation manner as described above, there is further provided an implementation manner, wherein the pressure of the pressing in the step S3 is 5MPa to 10MPa, and the dwell time is 1mi n to 2mi n.
In the aspect and any possible implementation manner as described above, there is further provided an implementation manner, in step S4, the carbonization pressure of the carbonization treatment is 0.1MPa to 0.5MPa, and co 2 The concentration is 10-100%, the carbonization time is 1-24 h, the carbonization temperature is 30-60 ℃, and the relative humidity during carbonization treatment is 50-98%.
In the aspects and any possible implementation manner described above, there is further provided an implementation manner, wherein the grain size of the steel slag powder is not more than 0.3mm.
In aspects and any one of the possible implementations described above, there is further provided an implementation in which the embryo body is a cylinder with a diameter and a height of 20 mm.
In aspects and any one of the possible implementations described above, there is further provided an implementation in which the mass ratio of ammonium citrate to water in the lift agent solution is 1:45.
On the other hand, the application provides a high-strength carbonized steel slag cementing material, which is prepared by adopting the preparation method of the high-strength carbonized steel slag cementing material;
the compressive strength of the high-strength carbonized steel slag cementing material is 99-108MPa, and the CO content of each hundred grams of steel slag powder is equal to that of the high-strength carbonized steel slag cementing material 2 The absorption amount is 16.2-17g, and the porosity is 14.0-15.1%.
Compared with the prior art, one of the technical schemes has the following advantages or beneficial effects: the application uses CO with larger steel slag 2 Sealing potential, introducing a lifting agent into steel slag, and improving the non-leaching calcium ions in the early stage of carbonization and CO in the later stage of carbonization through the existence of citrate and ammonium in solution 2 The problem of difficult dissolution can be solved, and the leaching of calcium ions in the steel slag can be improved and the CO is promoted 2 Thereby promoting the calcium ions and CO of the steel slag sample in the early and late stages of carbonization 2 The carbonization reaction in the liquid phase improves the carbonization degree of the steel slag and the formation of calcium carbonate, and promotes the filling of the gaps of the steel slag sampleThe mechanical property and durability of the steel slag sample are further improved;
the other technical scheme has the following advantages or beneficial effects: the application relieves the problems of land resource waste and ecological environment pollution caused by the large-scale stacking of metallurgical slag to a certain extent, and simultaneously relieves CO 2 The emission amount of the catalyst promotes the realization of carbon neutralization; steel slag and CO 2 The resource utilization of (3) can finally realize the increase of economic benefit.
Of course, it is not necessary for any of the products embodying the application to achieve all of the technical effects described above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for preparing a high-strength carbonized steel slag cement according to one embodiment of the present application;
FIG. 2 is a bar graph of compressive strength tests for the products of inventive examples 1-4 and comparative example 1;
FIG. 3 is a bar graph showing the statistical results of the carbonization degree of the products of examples 1 to 4 and comparative example 1 according to the present application;
FIG. 4 is a bar graph of the statistical results of the porosities of the products of inventive examples 1-4 and comparative example 1.
Detailed Description
For a better understanding of the technical solution of the present application, the following detailed description of the embodiments of the present application refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The preparation method of the high-strength carbonized steel slag cementing material is shown in fig. 1, and comprises the following steps:
(1) Fully mixing the ground steel slag powder with a lifting agent and liquid substances (such as water and the like) required for preparing the steel slag cementing material to form a wetting mixture; specifically, the liquid and the lifting agent are uniformly mixed to obtain a mixed solution, and then the mixed solution is mixed with the steel slag powder to obtain a wet mixture;
the lifting agent is ammonium citrate or ammonium citrate and H 2 SO 4 Mixing at least one of citric acid and sodium citrate;
the added mass of the ammonium citrate in the lifting agent accounts for 0.1 to 2.0 weight percent of the steel slag powder, and the ammonium citrate and H 2 SO 4 The added mass of the lifting agent formed by mixing at least one of citric acid and sodium citrate accounts for 0.1-2.0wt% of the steel slag powder; the mass ratio of the lifting agent solution (i.e. the mixed solution of the lifting agent and the water) to the steel slag powder is 1:5-10;
ammonium citrate and H 2 SO 4 In the lifting agent formed by mixing at least one of citric acid and sodium citrate: h 2 SO 4 The mass ratio of the citric acid to the ammonium citrate is 0-1:3, and the mass ratio of the citric acid or the sodium citrate to the ammonium citrate is 0-1:2;
the grain size of the steel slag powder is not more than 0.3mm; during preparation, the steel slag to be treated is dried, ground and screened, and the screened raw materials are collected to obtain steel slag powder meeting the particle size requirement; the drying temperature is 100-110 ℃ and the drying time is 22-26 hours;
the application does not have rigid requirement on the dosage of liquid (water) and can meet the mixing requirement and the subsequent blank molding requirement;
(2) Pressing the well mixed wet mixture into a desired embryo;
the pressing pressure is 5-10 MPa, and the pressure maintaining time is 1-2 min;
(3) Placing the embryo body in a CO-rich state 2 Carbonizing the steel slag based carbonized material in the environment of (1) to obtain the steel slag based carbonized material;
carbonization of carbonization treatmentThe pressure is 0.1MPa to 0.5MPa, and CO 2 The concentration is 10-100%, the carbonization time is 1-24 h, the carbonization temperature is 30-60 ℃, and the relative humidity during carbonization treatment is 50-98%.
Example 1:
the preparation method of the steel slag-based carbonized material comprises the following steps:
(1) Taking 0.1g of ammonium citrate and 4.5g of water, and fully mixing to prepare a lifting agent solution;
(2) Taking 30g of steel slag powder and fully mixing the steel slag powder with the lifting agent solution prepared in the step (1) to obtain a wet mixture;
(3) Placing the wet mixture obtained in the step (2) into a stainless steel die, maintaining the pressure at 8MPa for 2min, and demolding to obtain a cylindrical steel slag pressed blank with the diameter and the height of 20 mm;
(4) Placing the steel slag pressed blank formed in the step (3) to be rich in CO 2 In the environment of (2), the carbonization pressure is 0.1MPa and CO 2 The concentration is 99%, the carbonization time is 12h, the carbonization temperature is 30 ℃, and the relative humidity during carbonization treatment is 80%. Obtaining the carbonized steel slag sample.
Example 2:
the preparation method of the steel slag-based carbonized material comprises the following steps:
(1) Take 0.02g H 2 SO 4 Thoroughly mixing 0.1g of ammonium citrate with 4.5g of water to prepare a lifting agent solution;
(2) Taking 30g of steel slag powder and fully mixing the steel slag powder with the lifting agent solution prepared in the step (1) to obtain a wet mixture;
(3) Placing the wet mixture obtained in the step (2) into a stainless steel die, maintaining the pressure at 8MPa for 2min, and demolding to obtain a cylindrical steel slag pressed blank with the diameter and the height of 20 mm;
(4) Placing the steel slag pressed blank formed in the step (3) to be rich in CO 2 In the environment of (2), the carbonization pressure is 0.1MPa and CO 2 The concentration is 99%, the carbonization time is 12h, the carbonization temperature is 30 ℃, and the relative humidity during carbonization treatment is 80%. Obtaining the carbonized steel slag sample.
Example 3:
the preparation method of the steel slag-based carbonized material comprises the following steps:
(1) Taking 0.04g of citric acid, 0.1g of ammonium citrate and 4.5g of water, and fully mixing to prepare a lifting agent solution;
(2) Taking 30g of steel slag powder and fully mixing the steel slag powder with the lifting agent solution prepared in the step (1) to obtain a wet mixture;
(3) Placing the wet mixture obtained in the step (2) into a stainless steel die, maintaining the pressure at 8MPa for 2min, and demolding to obtain a cylindrical steel slag pressed blank with the diameter and the height of 20 mm;
(4) Placing the steel slag pressed blank formed in the step (3) to be rich in CO 2 In the environment of (2), the carbonization pressure is 0.1MPa and CO 2 The concentration is 99%, the carbonization time is 12h, the carbonization temperature is 30 ℃, and the relative humidity during carbonization treatment is 80%. Obtaining the carbonized steel slag sample.
Example 4:
(1) Taking 0.04g of sodium citrate, 0.1g of ammonium citrate and 4.5g of water, and fully mixing to prepare a lifting agent solution;
(2) Taking 30g of steel slag powder and fully mixing the steel slag powder with the lifting agent solution prepared in the step (1) to obtain a wet mixture;
(3) Placing the wet mixture obtained in the step (2) into a stainless steel die, maintaining the pressure at 8MPa for 2min, and demolding to obtain a cylindrical steel slag pressed blank with the diameter and the height of 20 mm;
(4) Placing the steel slag pressed blank formed in the step (3) to be rich in CO 2 In the environment of (2), the carbonization pressure is 0.1MPa and CO 2 The concentration is 99%, the carbonization time is 12h, the carbonization temperature is 30 ℃, and the relative humidity during carbonization treatment is 80%. Obtaining the carbonized steel slag sample.
Comparative example 1:
(1) Mixing 30g of steel slag powder with 4.5g of water thoroughly to obtain a wet mixture;
(2) Placing the wet mixture obtained in the step (1) into a stainless steel die, maintaining the pressure at 8MPa for 2min, and demolding to obtain a cylindrical steel slag pressed blank with the diameter and the height of 20 mm;
(3) Placing the steel slag blank formed in the step (2)To be rich in CO 2 In the environment of (2), the carbonization pressure is 0.1MPa and CO 2 The concentration is 99%, the carbonization time is 12h, the carbonization temperature is 30 ℃, and the relative humidity during carbonization treatment is 80%. Obtaining the carbonized steel slag sample.
Performance test:
1. compressive strength test: the samples of the carbonized steel slag prepared in examples 1 to 4 and comparative example 1 were subjected to compressive strength test using CL-3002 automatic pressure tester, and the test results of compressive strength are shown in fig. 2.
2.CO 2 Absorption amount: the carbonized steel slag samples prepared in examples 1 to 4 and comparative example 1 were tested by means of mass change before and after carbonization of the samples, CO 2 The absorption amount is calculated as in formula (1), and the test result is shown in FIG. 3.
In formula (1):
M 0 representing the mass of the sample after drying, i.e. 30g, before carbonization;
M 1 indicating the mass of the sample after carbonization after drying.
3. Porosity: the samples of the carbonized steel slag prepared in examples 1 to 4 and comparative example 1 were tested using a mercury intrusion tester, and the results of the porosity test of the carbonized steel slag samples are shown in fig. 4.
As can be seen from FIG. 3, the addition of the lifting agent increased the CO of the steel slag sample compared to comparative example 1 2 Absorption and thus more calcium carbonate is produced. The high volume of calcium carbonate produced void structures filled with the carbonized steel slag sample, resulting in a sample of carbonized steel slag doped with a lifting agent having a smaller porosity and a more dense structure, as shown in fig. 4. Just because of the compact structure of the carbonized steel slag sample, the carbonized steel slag sample doped with the lifting agent has more excellent compressive strength, as shown in fig. 2. Carbonization of steel slag samples is mainly leached by calcium ions and CO 2 Wherein the pH value of the liquid phase in the carbonization early stage is high, and the leaching of calcium ions is taken as a main limiting factor; the pH value of liquid phase in the later carbonization stage is lowIn the form of CO 2 Is a major limiting factor. The lift agent provides citrate and ammonium ions to the aqueous solution in the sample void. In the initial carbonization stage of steel slag, the liquid phase has high pH value, and the ammonium ion can be combined with OH in the liquid phase - The pH value of the liquid phase is reduced by ion combination regulation, and the leaching process of calcium from the steel slag particles is promoted by combining the covalent reaction process of citrate and calcium ions; in the latter stage of carbonization, the liquid phase has a low pH value, and ammonium ions bond OH - Is released while citrate binds H in the liquid phase + The ions are used for regulating the pH value and promoting the reaction of CO 2 Dissolution in the liquid phase. Thereby promoting the carbonization process of the steel slag sample in the early and later stages of carbonization and improving CO 2 The absorption capacity and the porosity of the carbonized steel slag sample are reduced, and the mechanical property of the carbonized steel slag sample is improved.
The high-strength carbonized steel slag cementing material and the preparation method provided by the embodiment of the application are described in detail. The above description of embodiments is only for aiding in the understanding of the method of the present application and its core ideas; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or system comprising such elements. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. In the present application, the term "and/or" is used merely to describe an association relationship of association objects, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Claims (10)
1. The preparation method of the high-strength carbonized steel slag cementing material is characterized by comprising the following steps of:
s1, uniformly mixing a lifting agent and water to obtain a lifting agent solution;
the lifting agent is ammonium citrate or ammonium citrate and H 2 SO 4 A mixture of at least one of citric acid, sodium citrate;
s2, fully mixing the lifting agent solution and the steel slag powder to obtain a wet mixture;
s3, pressing the wet mixture to obtain a blank;
s4, placing the embryo body in a CO-rich state 2 And (3) carbonizing the steel slag in the environment to obtain the carbonized steel slag cementing material.
2. The method for preparing the high-strength carbonized steel slag cementing material according to claim 1, wherein the addition amount of the lifting agent is 0.1-2.0wt% of the steel slag powder.
3. The method for preparing the high-strength carbonized steel slag cementing material according to claim 2, wherein the mass ratio of the lifting agent solution to the steel slag powder is 1:5-10.
4. The method for producing high-strength carbonized steel slag cement according to claim 1, which is characterized in thatCharacterized in that when the lifting agent is the mixture, H 2 SO 4 The mass ratio of the citric acid and/or sodium citrate to the ammonium citrate is 0-1:3, and the mass ratio of the citric acid and/or sodium citrate to the ammonium citrate is 0-1:2.
5. The method for preparing a high-strength carbonized steel slag cementing material according to claim 1, wherein the pressing pressure in the step S3 is 5 MPa-10 MPa, and the dwell time is 1 min-2 min.
6. The method for producing high-strength carbonized steel slag cement according to claim 1, wherein in step S4, the carbonization pressure of the carbonization treatment is 0.1MPa to 0.5MPa, and co 2 The concentration is 10-100%, the carbonization time is 1-24 h, the carbonization temperature is 30-60 ℃, and the relative humidity during carbonization treatment is 50-98%.
7. The method for producing a high-strength carbonized steel slag cement according to claim 1, wherein the grain size of the steel slag powder is not more than 0.3mm.
8. The method for preparing the high-strength carbonized steel slag cementing material according to claim 1, wherein the embryo body is a cylinder with the diameter and the height of 20 mm.
9. The method for preparing the high-strength carbonized steel slag cementing material according to claim 1, wherein the mass ratio of the ammonium citrate to the water in the lifting agent solution is 1:45.
10. The high-strength carbonized steel slag cementing material is characterized in that the high-strength carbonized steel slag cementing material is prepared by adopting the preparation method of the high-strength carbonized steel slag cementing material according to any one of claims 1-9;
the compressive strength of the high-strength carbonized steel slag cementing material is 99-108MPa, and the CO content of each hundred grams of steel slag powder is equal to that of the high-strength carbonized steel slag cementing material 2 The absorption amount is 16.2-17g, and the porosity is 14.0-15.1%.
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