CN116874204B - Cementing material prepared by carbon capture and excitation of steel slag activity and method thereof - Google Patents
Cementing material prepared by carbon capture and excitation of steel slag activity and method thereof Download PDFInfo
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- CN116874204B CN116874204B CN202311127658.4A CN202311127658A CN116874204B CN 116874204 B CN116874204 B CN 116874204B CN 202311127658 A CN202311127658 A CN 202311127658A CN 116874204 B CN116874204 B CN 116874204B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 145
- 239000010959 steel Substances 0.000 title claims abstract description 145
- 239000002893 slag Substances 0.000 title claims abstract description 138
- 239000000463 material Substances 0.000 title claims abstract description 50
- 230000000694 effects Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 21
- 230000005284 excitation Effects 0.000 title claims abstract description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 60
- 238000003763 carbonization Methods 0.000 claims description 33
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 30
- 239000001569 carbon dioxide Substances 0.000 claims description 28
- 239000004568 cement Substances 0.000 claims description 21
- 239000007789 gas Substances 0.000 claims description 16
- 238000000227 grinding Methods 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 11
- 239000002440 industrial waste Substances 0.000 claims description 10
- 239000002912 waste gas Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 5
- 238000010000 carbonizing Methods 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 229910001341 Crude steel Inorganic materials 0.000 claims 1
- 239000004576 sand Substances 0.000 description 18
- 238000012360 testing method Methods 0.000 description 16
- 239000000843 powder Substances 0.000 description 14
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 9
- 239000000292 calcium oxide Substances 0.000 description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 9
- 239000007788 liquid Substances 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 8
- 230000000087 stabilizing effect Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
- 238000010025 steaming Methods 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000003292 glue Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- -1 alcohol amine Chemical class 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000004567 concrete Substances 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 description 3
- 229910052912 lithium silicate Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- ZNCPFRVNHGOPAG-UHFFFAOYSA-L sodium oxalate Chemical compound [Na+].[Na+].[O-]C(=O)C([O-])=O ZNCPFRVNHGOPAG-UHFFFAOYSA-L 0.000 description 3
- 229940039790 sodium oxalate Drugs 0.000 description 3
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012496 blank sample Substances 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
Abstract
The invention relates to the technical field of steel slag-based cementing materials, in particular to a cementing material prepared by carbon capture and excitation of steel slag activity and a method thereof.
Description
Technical Field
The invention relates to the technical field of steel slag-based cementing materials, in particular to a cementing material prepared by carbon capture and excitation of steel slag activity and a method thereof.
Background
Steel slag is an industrial slag produced in a steel-making process, and the discharge amount thereof is about 15% of the steel yield. The accumulated steel slag occupies a large amount of land resources and also aggravates environmental load. The steel slag is rich in dicalcium silicate (C) 2 S), tricalcium silicate (C) 3 S) and other minerals, similar to the components of cement clinker, have certain gelling activity and can be used as high-efficiency mineral admixture for cement and concrete. However, the steel slag is generally formed at a temperature above 1600 ℃ and higher than the forming temperature 1450 ℃ of the silicate cement clinker, and the cement clinker has compact mineral crystal and larger crystal grains, is called as 'overburning cement clinker', and is an active cementing material. The development and application of the steel slag are restricted by the activity problem of the steel slag, the existing research is concentrated on the aspects of activity excitation measures of the steel slag and the like, the carbonization of the steel slag is partially researched in the prior art, and the research of the influence research of an exciting agent on the carbonization rate of the steel slag shows that: when the internal mixing amount of phosphogypsum is 2.5%, the carbonization rate of steel slag can be improved, the strength of a steel slag powder carbonized consolidated body test piece is maximum, and each kilogram of steel slag mixture (the mixing amount of phosphogypsum is 2.5%) can be carbonized and stored with 155 and g CO after carbonization reaction 2 ，Na 2 CO 3 When the doping amount is 1%, the strength of the steel slag powder slurry test block reaches the maximum value of 65.7 MPa after carbonization, the strength is improved by 58.7%, and the Na is improved 2 SO 4 When the doping amount is 1%, the strength of the test piece is 60.3MPa, and the strength is improved by 45.7%. The research of the influence of carbonation pretreatment on the volume stability and hydration activity of the steel slag-cement composite cementing material shows that: cement mortar test block 3 containing 30 percent (mass fraction) of steel slag,28 The compressive strength is respectively reduced by 43.2 percent and 30.0 percent compared with the non-steel slag-doped cement mortar, and the net paste test block is collapsed due to overlarge expansion after the press steaming test; the CO2 concentration has obvious influence on the carbon fixation amount of the steel slag, and the carbon fixation amount of the steel slag reaches 3.67 percent when high-concentration (volume fraction is 99.9%) CO2 is carbonized and maintained for 3 min. According to the performance optimization and principle of steel slag-based carbonized cementing materials and carbonized artificial aggregates, a dry and hard pressure molding test block is prepared by taking ground converter steel slag powder as a raw material, the influence of molding pressure, water-solid ratio and carbonization time in the preparation process of the test block on the carbon dioxide absorptivity and compressive strength of the test block is analyzed by using a response surface model, the steel slag-based artificial aggregates are prepared by using a granulating molding technology, and the influence of accelerated carbonization on the aggregate performance is explored and the principle is revealed at different stages. CO (carbon monoxide) 2 Influence study of pretreatment on stability and hydration Activity of Steel slag by low concentration CO 2 The gas is used for preprocessing the steel slag cementing material to improve the volume stability and hydration activity of the steel slag. The study of the preparation of permeable concrete by carbonized steel slag aggregate uses carbonized aggregate to replace common aggregate to prepare permeable concrete. Patent document CN101139182A, CN101851071A, CN112110659A, CN103992054A, CN108609882A, CN109608150A, CN112266204A, CN114477948A, CN114890690A, CN115626795A, CN115872650A, CN115872637a and the like also describe that the steel slag is carbonized and then applied. However, it is not difficult to find out that carbonization of steel slag in the prior art is mainly divided into four technical paths: 1. the steel slag powder is carbonized to be used as an admixture, 2, the steel slag particles are carbonized to be used as aggregate, 3, the steel slag powder and/or the steel slag particles are used for preparing building material products and then are carbonized and maintained, and 4, carbon dioxide is introduced into the steel slag powder in the grinding process for carbonization. However, although the steel slag can be recycled in the mode, the steel slag can be mainly used as an admixture or aggregate, and cannot completely replace cement to be used as a cementing material, the activity of the steel slag as an admixture is low, the activity index of the steel slag is basically in the range of 75-90%, and the content of free calcium oxide is lower than 0.5%, so that the high-efficiency utilization of the steel slag is restricted.
Aiming at the requirements of a large amount of steel slag and environmental protection targets generated in the steel industry at present, a cementing material prepared by carbon capture and excitation of the activity of the steel slag and a method thereof are developed so as to promote the recycling of waste slag and industrial waste gas in the steel industry, and have important practical significance for realizing circular economy and targets.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a method for preparing a cementing material by carbon capture and excitation of steel slag activity, and the cementing material prepared by the method, wherein the carbon dioxide in industrial waste gas is captured by a wet method in a pressurized environment by large-particle steel slag, the steel slag cementing activity is synchronously excited, and then grinding is carried out, so that the steel slag activity is fully improved, the content of free calcium oxide in the prepared cementing material fine powder is lower than 0.1%, the mechanical property can be compared with 32.5 cement standard, and the high-efficiency recycling of steel slag and industrial waste gas is realized.
Specifically, the method for preparing the cementing material by carbon capture and excitation of the steel slag activity comprises the following steps:
1) Screening the steel slag, and selecting coarse steel slag with the grain size of 0.075-20 mm;
2) Adding the coarse steel slag into a pressurizing carbonization device according to a certain liquid-solid ratio;
3) Charging the industrial waste gas containing carbon dioxide into a pressurized carbonization device;
4) Pressurizing and carbonizing the coarse steel slag by a pressurizing and carbonizing device to trap carbon dioxide of the coarse steel slag, so as to obtain excited coarse steel slag;
5) And (3) removing the excited coarse steel slag from the pressurizing carbonization device, dehydrating, drying and grinding to obtain the cementing material.
Preferably, the grain size of the coarse steel slag in the step 1) is 0.075-1mm.
Preferably, the grain size of the coarse steel slag in the step 1) is 1-5mm.
Preferably, the grain size of the coarse steel slag in the step 1) is 5-10mm.
Preferably, the grain size of the coarse steel slag in the step 1) is 10-20mm.
Preferably, the grain size of the coarse steel slag in the step 1) is 5-20mm.
Compared with the prior art, the method directly utilizes the coarse steel slag particles to carry out carbon capture in a pressurized wet process environment and then grind the coarse steel slag particles into the size range of the cementing material, and has better steel slag excitation and free calcium oxide reduction effects compared with steel slag powder carbonization.
Preferably, the liquid-solid ratio of step 2) is 0.2-0.6. Experiments show that the invention is more beneficial to steel slag carbonization by adopting a wet environment, and the absorption liquid can adopt water or adopts aqueous solution of alcohol amine, lithium silicate and sodium oxalate according to the mass ratio of 1:0.5-0.9:0.8-1.5, wherein the mass concentration of the solution is 5-8%. The research shows that the water is used as the absorption liquid to meet the carbon trapping requirement of coarse steel slag particles, and in order to further improve the carbon trapping effect, the invention proves that the mechanical property of the cementing material can be further improved by using the aqueous solution prepared from alcohol amine, lithium silicate and sodium oxalate as the absorption liquid through multiple experiments.
Preferably, the industrial waste gas in the step 3) is at least one of waste gas of coal-fired power plants, blast furnace tail gas of steel plants, waste gas of cement kilns, or other industrial waste gas containing carbon dioxide.
Preferably, the concentration of carbon dioxide in the industrial waste gas in step 3) is 10-100%.
Preferably, the step 4) of boosting process is a gradient boosting. More effectively, the gradient boosting is boosting-stabilizing-re-boosting-re-stabilizing, and the final pressure threshold is 0.2-1MPa. The invention can select a stepped boosting-stabilizing program to reach a carbonization pressure threshold according to different grain size steel slag and liquid-solid ratio without departing from the essence of the invention, and industrial tail gas is introduced below the liquid level of the absorption liquid, and CO in the tail gas 2 Carbonate radicals are formed in the absorption liquid, and then the alkaline steel slag is carbonized.
Preferably, the carbon dioxide capturing time of the coarse steel slag is 15-480min.
Preferably, step 5) is milled to a particle size of less than 0.075mm. The cement has a particle size range equivalent to that of cement, and can be directly used as a cementing material by completely or partially replacing cement.
The invention also relates to a carbon-trapping steel slag cementing material, which is prepared by the method.
The carbon-trapping steel slag cementing material prepared by the method is detected by using the sand, the mechanical property of the cementing material can be compared with the standard of 32.5 cement, the cementing material can be used for preparing various pavement bricks, building blocks, foam cement and the like by completely replacing cement, the activity index can reach 105%, the production process completely utilizes the waste steel slag and carbon dioxide in waste gas in the steel industry production as raw materials, the problem of stockpiling pollution environment caused by difficult resource reasonable utilization of the steel slag as a by-product in the steel industry production is solved, the problem of greenhouse gas effect caused by carbon dioxide emission in industrial tail gas is reduced, and 90-120kg of carbon dioxide can be fixed by 1000kg of steel slag, so that the combination of the recycling economy and the aim of the steel industry is effectively realized.
Detailed Description
In order to characterize the technical effect of the invention, the embodiment prepares the carbon-trapping steel slag cementing material, and utilizes the carbon-trapping steel slag cementing material to replace cement to carry out a mortar test, wherein the mixing ratio is 450g of the carbon-trapping steel slag cementing material, 1350g of standard sand and 0.4 of cement ratio, and the mechanical property is detected, and the free calcium oxide is tested according to a cement stability detection method.
Example 1
The method for preparing the cementing material by carbon capture and excitation of the activity of the steel slag comprises the following steps:
1) Screening the steel slag, and selecting coarse steel slag with the grain size of 1-5 mm;
2) Adding the coarse steel slag into a pressurizing carbonization device according to a liquid-solid ratio of 0.5, wherein water is adopted as absorption liquid;
3) Charging the waste gas of the coal-fired power plant containing carbon dioxide into a pressurizing carbonization device;
4) The pressurizing carbonization device carries out gradient pressure boosting according to the process of pressure boosting, pressure stabilizing, pressure boosting again and pressure stabilizing to 0.7MPa, so that the coarse steel slag is subjected to carbon dioxide trapping, and the excited coarse steel slag is obtained, wherein the carbon dioxide trapping time is 360min;
5) And (3) removing the excited coarse steel slag from the pressurized carbonization device, dehydrating, drying, and grinding to a particle size smaller than 0.075mm to obtain a cementing material.
Through detection, the weight of the carbonized steel slag is increased by 9.2%, the compressive strength of the bonded sand is 14.9MPa for 7d, the flexural strength of the bonded sand is 3.2MPa for 7d, the compressive strength of the bonded sand is 33.8MPa for 28d, the flexural strength of the bonded sand is 5.3MPa for 28d, the concentration of free calcium oxide is 0.08%, and the compression-steaming expansion rate of the bonded sand is 0.06% in 6 hours.
Example 2
The method for preparing the cementing material by carbon capture and excitation of the activity of the steel slag comprises the following steps:
1) Screening the steel slag, and selecting coarse steel slag with the grain size of 5-20 mm;
2) Adding the coarse steel slag into a pressurizing carbonization device according to a liquid-solid ratio of 0.5, wherein an absorption liquid adopts an aqueous solution of triethanolamine, lithium silicate and sodium oxalate according to a mass ratio of 1:0.8:1, and the mass concentration of the solution is 8%;
3) Filling the cement kiln waste gas containing carbon dioxide into a pressurizing carbonization device;
4) The pressurizing carbonization device carries out gradient pressure boosting according to the process of pressure boosting, pressure stabilizing, pressure boosting again and pressure stabilizing to 0.8MPa, so that the coarse steel slag is subjected to carbon dioxide trapping, and the excited coarse steel slag is obtained, wherein the carbon dioxide trapping time is 300min;
5) And (3) removing the excited coarse steel slag from the pressurized carbonization device, dehydrating, drying, and grinding to a particle size smaller than 0.075mm to obtain a cementing material.
Through detection, the weight of the carbonized steel slag is increased by 11.2%, the compressive strength of the bonded sand is 16.3MPa for 7d, the flexural strength is 3.5MPa for 7d, the compressive strength is 38.5MPa for 28d, the flexural strength is 6.6MPa for 28d, the concentration of free calcium oxide is 0.06%, and the compression-steaming expansion rate is 0.04% for 6 hours.
Example 3
The carbon-trapping steel slag cementing material of the example 1 is used for replacing PO42.5 cement according to the proportion of 30 percent as a test example to carry out a glue sand test, and the glue sand test piece is used for carrying out 28d compressive strength comparison with a glue sand test piece which completely adopts the PO42.5 cement, the water-glue ratio is 0.4, and the activity index of the carbon-trapping steel slag cementing material as an admixture is verified.
The test shows that the compressive strength of the blank sample 28d is 45.7MPa, the compressive strength of the test example 28d is 49.2MPa, and the activity index is more than 105%.
Comparative example 1
The preparation method of the steel slag cementing material comprises the following steps:
1) Selecting coarse steel slag with the grain size of 1-5mm, and grinding the coarse steel slag until the grain size is smaller than 0.075mm to obtain steel slag micro powder;
2) Adding the steel slag micropowder into a pressurizing carbonization device according to a liquid-solid ratio of 0.5, wherein water is adopted as absorption liquid;
3) Charging the waste gas of the coal-fired power plant containing carbon dioxide into a pressurizing carbonization device;
4) The pressurizing carbonization device carries out gradient pressure boosting according to the process of pressure boosting, pressure stabilizing, pressure boosting again and pressure stabilizing to 0.7MPa, so that the steel slag micro powder is subjected to carbon dioxide trapping to obtain carbonized steel slag micro powder, and the carbon dioxide trapping time is 360min;
5) And (3) removing the carbonized steel slag micropowder from the pressurized carbonization device, and dehydrating and drying to obtain the cementing material.
Through detection, the weight of carbonized steel slag is increased by 6.2%, the compressive strength of the bonded sand is 8.7MPa, the flexural strength of the bonded sand is 7d is 2.1MPa, the compressive strength of the bonded sand is 28d is 22.4MPa, the flexural strength of the bonded sand is 28d is 3.6MPa, the concentration of free calcium oxide is 0.15%, and the compression-steaming expansion rate of the bonded sand is 0.13% in 6 hours.
Comparative example 2
The preparation method of the steel slag cementing material comprises the following steps:
1) Selecting coarse steel slag with the grain size of 1-5mm, and grinding the coarse steel slag until the grain size is smaller than 0.075mm to obtain steel slag micro powder;
2) Adding the steel slag micropowder into a pressurizing carbonization device;
3) Charging the waste gas of the coal-fired power plant containing carbon dioxide into a pressurizing carbonization device;
4) The pressurizing carbonization device carries out gradient pressure boosting according to the processes of pressure boosting, pressure stabilizing, pressure boosting again and pressure stabilizing to 0.7MPa, so that the steel slag micro powder is subjected to carbon dioxide trapping to obtain carbonized steel slag micro powder, and the carbon dioxide trapping time is 360min, so as to obtain the cementing material.
Through detection, the weight of carbonized steel slag is increased by 2.1%, the compressive strength of the bonded sand is 3.5MPa for 7d, the flexural strength is 1.2MPa for 7d, the compressive strength is 17.6MPa for 28d, the flexural strength is 1.7MPa for 28d, the concentration of free calcium oxide is 0.29%, and the compression-steaming expansion rate is 0.22% in 6 hours.
Comparative example 3
The preparation method of the steel slag cementing material comprises the following steps: selecting coarse steel slag with the grain size of 1-5mm, grinding, introducing waste gas of a coal-fired power plant containing carbon dioxide in the grinding process, and grinding until the grain size is smaller than 0.075mm to obtain a steel slag cementing material.
Through detection, the weight of carbonized steel slag is increased by 1.6%, the compressive strength of the bonded sand is 3.3MPa for 7d, the flexural strength is 1.9MPa for 7d, the compressive strength is 8.7MPa for 28d, the flexural strength is 1.5MPa for 28d, the concentration of free calcium oxide is 0.25%, and the compression-steaming expansion rate is 0.27% in 6 hours.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limited thereto; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features can be replaced with equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The method for preparing the cementing material by carbon capture and excitation of the activity of the steel slag is characterized by comprising the following steps of:
1) Screening the steel slag, and selecting coarse steel slag with the grain size of 0.075-20 mm;
2) Adding the coarse steel slag into a pressurizing carbonization device according to a certain liquid-solid ratio;
3) Charging the industrial waste gas containing carbon dioxide into a pressurized carbonization device;
4) Pressurizing and carbonizing the coarse steel slag by a pressurizing and carbonizing device to trap carbon dioxide of the coarse steel slag, so as to obtain excited coarse steel slag;
5) And (3) removing the excited coarse steel slag from the pressurizing carbonization device, dehydrating, drying and grinding to obtain the cementing material.
2. The method for preparing the cementing material by carbon capture excitation of steel slag activity according to claim 1, wherein in the step 1), the grain size of the crude steel slag is 0.075-1mm or 1-5mm, or 5-10mm or 10-20mm.
3. The method for preparing the cementing material by carbon capture excitation of steel slag activity according to claim 1, wherein the liquid-solid ratio of the step 2) is 0.2-0.6.
4. The method for preparing cementing material by carbon capture excitation of steel slag activity according to claim 1, wherein the industrial waste gas in the step 3) is at least one of waste gas of coal-fired power plants, blast furnace tail gas of steel plants and waste gas of cement kilns.
5. The method for preparing the cementing material by capturing and exciting the activity of the steel slag according to claim 1, wherein the concentration of carbon dioxide in the industrial waste gas in the step 3) is 10-100%.
6. The method for preparing the cementing material by capturing and exciting the activity of the steel slag according to claim 1, wherein the step 4) boosting process is gradient boosting.
7. The method for preparing the cementing material by carbon capture excitation steel slag activity according to claim 6, wherein the gradient pressure is increased to be increased-stabilized-increased-re-stabilized, and the final pressure threshold is 0.2-1MPa.
8. The method for preparing the cementing material by carbon capture excitation of steel slag activity according to claim 6, wherein the carbon dioxide capture time of the coarse steel slag is 15-480min.
9. The method for preparing the cementing material by carbon capture excitation of steel slag activity according to claim 1, wherein the step 5) is grinding to a particle size of less than 0.075mm.
10. The carbon-trapping steel slag cementing material is characterized by being prepared by the method of any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311127658.4A CN116874204B (en) | 2023-09-04 | 2023-09-04 | Cementing material prepared by carbon capture and excitation of steel slag activity and method thereof |
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| CN202311127658.4A CN116874204B (en) | 2023-09-04 | 2023-09-04 | Cementing material prepared by carbon capture and excitation of steel slag activity and method thereof |
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| CN116874204A CN116874204A (en) | 2023-10-13 |
| CN116874204B true CN116874204B (en) | 2023-11-07 |
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| CN202311127658.4A Active CN116874204B (en) | 2023-09-04 | 2023-09-04 | Cementing material prepared by carbon capture and excitation of steel slag activity and method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111574146A (en) * | 2020-04-20 | 2020-08-25 | 浙江大学 | Method for preparing industrial solid waste base baking-free brick by combining composite cementing material with carbonation curing technology |
| CN112110659A (en) * | 2020-09-18 | 2020-12-22 | 中冶节能环保有限责任公司 | Method for capturing CO by using steel slag2Method and device for eliminating free CaO |
| CN112430051A (en) * | 2020-11-30 | 2021-03-02 | 山西大学 | Building material prepared by synergistic carbonization of steel slag, desulfurized gypsum and fly ash and method |
| CN112456944A (en) * | 2020-11-30 | 2021-03-09 | 山西大学 | Amino modified SiO2Thermal insulation building material prepared by aerogel synergistic solid waste carbonization and method |
| KR102505258B1 (en) * | 2021-12-16 | 2023-02-28 | 정충의 | Construction material manufacturing method by capturing carbon dioxide using calcium carbonate generated from steelmaking slag |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111574146A (en) * | 2020-04-20 | 2020-08-25 | 浙江大学 | Method for preparing industrial solid waste base baking-free brick by combining composite cementing material with carbonation curing technology |
| CN112110659A (en) * | 2020-09-18 | 2020-12-22 | 中冶节能环保有限责任公司 | Method for capturing CO by using steel slag2Method and device for eliminating free CaO |
| CN112430051A (en) * | 2020-11-30 | 2021-03-02 | 山西大学 | Building material prepared by synergistic carbonization of steel slag, desulfurized gypsum and fly ash and method |
| CN112456944A (en) * | 2020-11-30 | 2021-03-09 | 山西大学 | Amino modified SiO2Thermal insulation building material prepared by aerogel synergistic solid waste carbonization and method |
| KR102505258B1 (en) * | 2021-12-16 | 2023-02-28 | 정충의 | Construction material manufacturing method by capturing carbon dioxide using calcium carbonate generated from steelmaking slag |
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Effective date of registration: 20231213 Address after: Room 503, 5th Floor, Office Building 5, South Side of Daqing Road, Taiyuan Road West, High tech Industrial Park, Tangshan City, Hebei Province, 063000 Patentee after: Carbon Solid (Hebei) Technology Co.,Ltd. Address before: 063009 West side of Taiyuan Road, High tech Zone, Tangshan City, Hebei Province South side of Daqing Road (500 meters north of the intersection of Tsinghua Road and Taiyuan Road) (lease term until October 10, 2024) Patentee before: Tangshan Ruikun Environmental Testing Service Co.,Ltd. |
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