CN115196897A - Method for preparing low-carbon admixture by using cement kiln tail gas and application - Google Patents
Method for preparing low-carbon admixture by using cement kiln tail gas and application Download PDFInfo
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- CN115196897A CN115196897A CN202210680631.7A CN202210680631A CN115196897A CN 115196897 A CN115196897 A CN 115196897A CN 202210680631 A CN202210680631 A CN 202210680631A CN 115196897 A CN115196897 A CN 115196897A
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- steel slag
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- slag powder
- cement kiln
- admixture
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 69
- 239000004568 cement Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000002893 slag Substances 0.000 claims abstract description 159
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 156
- 239000010959 steel Substances 0.000 claims abstract description 156
- 239000000843 powder Substances 0.000 claims abstract description 88
- 238000003763 carbonization Methods 0.000 claims abstract description 70
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000003546 flue gas Substances 0.000 claims abstract description 36
- 230000008569 process Effects 0.000 claims abstract description 17
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims abstract description 15
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 239000000292 calcium oxide Substances 0.000 claims abstract description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 7
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 6
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 5
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 11
- 239000011707 mineral Substances 0.000 claims description 11
- 239000004567 concrete Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 36
- 239000001569 carbon dioxide Substances 0.000 abstract description 18
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 17
- 239000004566 building material Substances 0.000 abstract description 8
- 239000002910 solid waste Substances 0.000 abstract description 7
- 230000009467 reduction Effects 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract 1
- 238000000227 grinding Methods 0.000 description 19
- 238000001035 drying Methods 0.000 description 10
- 230000007480 spreading Effects 0.000 description 9
- 238000003892 spreading Methods 0.000 description 9
- 238000007514 turning Methods 0.000 description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 8
- 239000002699 waste material Substances 0.000 description 7
- 229910052918 calcium silicate Inorganic materials 0.000 description 5
- 235000012241 calcium silicate Nutrition 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000000395 magnesium oxide Substances 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 5
- 230000009919 sequestration Effects 0.000 description 5
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 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 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 235000019976 tricalcium silicate Nutrition 0.000 description 2
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- JLDKGEDPBONMDR-UHFFFAOYSA-N calcium;dioxido(oxo)silane;hydrate Chemical compound O.[Ca+2].[O-][Si]([O-])=O JLDKGEDPBONMDR-UHFFFAOYSA-N 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- -1 thermal power Substances 0.000 description 1
- 238000010792 warming 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to the field of comprehensive utilization of industrial solid waste resources and low-carbon building materials, in particular to a method for preparing a low-carbon admixture by using tail flue gas of a cement kiln and application thereof. The preparation method comprises the following steps: taking steel slag powder and a mineralizer as raw materials, and mixing the steel slag powder and the mineralizer according to the weight ratio of 100: 0.5-2, and then carrying out carbonization reaction in the tail flue gas of the cement kiln to prepare a low-carbon admixture; the weight content of CaO in the steel slag powder is more than 30 percent; the mineralizer is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, calcium hydroxide or calcium carbonate. The invention solves the problems of low early activity and difficult large-scale utilization when metallurgical solid waste steel slag building materials are utilized, converts the steel slag into safe and stable CO which can be sealed and utilized 2 The low-carbon building material has simple process, short period and low cost, and realizes double reduction of carbon dioxide and industrial solid wastes and resource recycling.
Description
Technical Field
The invention relates to the field of comprehensive utilization of industrial solid waste resources and low-carbon building materials, in particular to a method for preparing a low-carbon admixture by using tail flue gas of a cement kiln and application thereof.
Background
With the increasing concern about global warming, the emission, capture and storage of the greenhouse gas carbon dioxide is also receiving more and more attention. The utilization and sequestration technology of carbon dioxide is considered as an important technical approach for realizing emission reduction action globally and is also an important means for coping with climate change. There are a number of carbon dioxide sequestration technologies available, with mineral sequestration being considered the safest method of carbon dioxide sequestration, which has a great potential to store carbon dioxide, and possibly even all carbon dioxide emitted in the future.
The mineral sealing and storing technology is to accelerate the alkali mineral and CO in nature by a certain technical means 2 And then form a stable carbonate. The reaction product obtained by the technology is stable, has no pollution to the environment, and is CO with very potential 2 And (4) storage technology. Bulk industrial solid wastes are the first choice for mineral sequestration due to easy acquisition and low cost. The steel slag is the waste slag discharged in the steel-making process, and the problems of unstable components, poor stability, low activity and especially low early activity exist in the slagging process of the steel slag, so that the large-scale application of the steel slag is greatly limited. The contradiction between large steel slag output, large stacking quantity and low utilization rate is increasingly prominent. The piling up of the steel slag not only occupies land, but also causes secondary pollution to the environment.
The steel slag has a large amount of calcium or magnesium-containing alkaline minerals because the chemical components and mineral compositions of the steel slag are similar to those of cement, so that the steel slag is endowed with excellent carbonization performance and can be used as a carrier for mineral sealing storageAnd (3) a body. The steel slag mainly comprises CaO and SiO 2 、Al 2 O 3 、Fe 2 O 3 、MgO、FeO、P 2 O 5 . These oxides are mainly present in the steel slag in the form of minerals, including tricalcium silicate (C) 3 S), dicalcium silicate (C) 2 S), RO phase (a continuous solid solution formed of MgO, feO and MnO), free calcium oxide (f-CaO), free magnesium oxide (f-MgO), and the like. Wherein, f-CaO, f-MgO, tricalcium silicate (C) 3 S) and dicalcium silicate (C) 2 S) and hydration reaction product of steel slag calcium hydroxide (Ca (OH) 2 ) And calcium silicate hydrate (C-S-H) and the like can be reacted with carbon dioxide to be carbonized.
The steel slag fixes CO through carbonization reaction 2 A stable carbonate can be obtained. Firstly, free calcium oxide and free magnesium oxide in the steel slag can be effectively digested through carbonization, the chemical stability of the steel slag is improved, and the steel slag can be safely applied to building materials such as cement concrete and the like. Secondly, the steel slag as a cementing material still has the problem of low early strength, which is mainly because the silicate mineral in the steel slag is subjected to high-temperature burning to cause compact structure, higher content of dicalcium silicate and slow hydration speed, dicalcium silicate can be converted into calcium carbonate in a carbonization mode, and the generated calcium carbonate crystals are filled in the system gaps, thereby being beneficial to compact structure, further improving the mechanical property of the steel slag, effectively improving the early strength, and further enabling the steel slag to be used in large scale in the building engineering.
At present, there are some methods for carbonizing building material products, artificial aggregates and the like by mixing steel slag with other raw materials. However, most of the carbonization processes are performed under high concentration of carbon dioxide and require heating and pressurization, which undoubtedly increases the manufacturing cost and energy consumption of the material. Particularly, the pressurizing condition is needed, so that the cost is increased, the requirement on carbonization equipment is greatly improved, and the yield is limited.
Therefore, an effective method is urgently needed to solve a series of contradiction problems of large carbon dioxide emission amount but low concentration, low utilization rate of steel slag resource, high energy consumption under carbonization conditions and the like in cement enterprises, and prepare a mineral admixture with wide application range.
Disclosure of Invention
The invention firstly provides a method for preparing a low-carbon admixture by using tail gas of a cement kiln, which comprises the following steps: taking steel slag powder and a mineralizer as raw materials, and mixing the steel slag powder and the mineralizer according to the weight ratio of 100: 0.5-2, and then carrying out carbonization reaction in the tail flue gas of the cement kiln to prepare a low-carbon admixture;
the weight content of CaO in the steel slag powder is more than 30 percent;
the mineralizer is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, calcium hydroxide or calcium carbonate.
The invention utilizes the cement kiln tail smoke as a carbon source to directly carbonize the steel slag powder, so that the steel slag is converted into a novel low-carbon admixture capable of fixing carbon and utilizing, the gelling activity, especially the early activity, of the steel slag is effectively improved, and the steel slag can be safely and efficiently applied to building materials.
Simultaneously, the low-concentration carbon dioxide in the tail flue gas of the cement kiln is utilized, and the CO discharged by the industry is not needed 2 The flue gas purification can change waste carbon dioxide discharged by cement enterprises into valuable, effectively reduce carbon emission and subsequent possible carbon capture cost, fully utilize the temperature characteristic of the cement kiln tail flue gas to accelerate the carbonization of the steel slag powder, has high carbonization efficiency, does not need pressurization, has simple preparation process and equipment, and can effectively reduce equipment requirements and preparation cost.
The preparation method of the invention realizes the dual purposes of utilizing the steel slag in a large scale and synergistically consuming the carbon dioxide of a cement enterprise.
In the specific implementation process, the carbonization is carried out in the tail flue gas bin of the cement kiln, so as to obtain the steel slag low-carbon admixture.
In a preferred embodiment of the present invention, the steel slag powder is derived from at least one of electric furnace steel slag, converter steel slag or open hearth steel slag.
As a preferred embodiment of the invention, CO in the tail flue gas of the cement kiln 2 The concentration of (b) is 10-25%.
As a preferred embodiment of the present invention, the temperature of the carbonization reaction is 25 to 90 ℃ and the humidity is 25 to 75%.
In a preferred embodiment of the present invention, the carbonization reaction is carried out for 2 to 7 days.
As a preferred embodiment of the present invention, the raw material further comprises water; the weight ratio of water to steel slag powder is 10-50:100.
by mixing with the water in the proportion, the steel slag powder and the mineralizer can be wetted, so that the steel slag powder and the mineralizer can be mixed fully, the carbonization reaction can be better carried out in the tail flue gas of the cement kiln, and the prepared low-carbon admixture has better performance. However, if water is not added, the carbonized steel slag powder can be directly utilized, secondary drying and grinding processes are omitted, secondary energy consumption is reduced, and the original secondary steel slag can be improved to a primary activity level.
In a preferred embodiment of the invention, the steel slag powder has a water content of 1% or less and a specific surface area of 350 to 450m 2 /kg。
As a preferred embodiment of the present invention, the method comprises the following steps:
(1) The prepared water content is less than 1 percent, and the specific surface area is 350-450m 2 Per kg of steel slag powder;
(2) And (2) mixing the steel slag powder and a mineralizer according to the weight ratio of 100: 0.5-2, or mixing the steel slag powder, the mineralizer and water according to the weight ratio of 100:0.5 to 2:10-50, performing carbonization reaction in the tail flue gas of the cement kiln, and stirring the materials at intervals of 6-12 h;
wherein the weight content of CaO in the steel slag powder is more than 30%; the mineralizer is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, calcium hydroxide or calcium carbonate;
(3) And carrying out the carbonization reaction for 2-7 days to obtain the low-carbon admixture.
As a preferred embodiment of the present invention, in the step (2), the steel slag powder and the mineralizer are mixed according to a weight ratio of 100: 0.5-2, slowly stirring for 30-60s, and quickly stirring for 90-180s to mix fully.
In the specific implementation process, the mixed materials can be loosely laid in a container and put into a tail flue gas bin of a cement kiln for carbonization reaction.
In the specific implementation process, after the carbonization reaction is carried out for 2-7 days, the materials are dried to prepare the low-carbon admixture.
Further, the present invention also provides a low carbon admixture made according to any of the embodiments described above.
The low-carbon admixture prepared by the invention can effectively reduce free CaO in the steel slag, improve the gelling activity, especially the early activity, of the steel slag, and compared with untreated steel slag powder, the activity index of 7d can be improved by 9-19%, the activity index of 28d can be improved by 4-16%, and the stability is good. Therefore, the low-carbon admixture prepared by the invention can simultaneously solve the problems of poor stability and low early activity of the steel slag.
In a preferred embodiment of the present invention, the low carbon admixture has a free CaO content of 0.7% or less.
Further, the invention also provides application of the low-carbon admixture prepared by any one of the embodiments in building engineering, and preferably application of the low-carbon admixture as a concrete mineral admixture.
The steel slag is the most difficult industrial solid waste in the metallurgical waste slag, compared with the prior art, the invention has the beneficial effects that:
the method solves the problems of poor stability and low early activity of the steel slag by means of carbonization treatment, thereby effectively converting the steel slag into a low-carbon environment-friendly building material, improving the resource utilization rate of the steel slag and reducing environmental pollution. In addition, the invention fully utilizes the characteristics of the tail flue gas of the cement kiln, effectively utilizes the low-concentration carbon dioxide discharged by a cement plant, effectively improves the carbonization reaction speed of the steel slag powder, obviously reduces the production cost and secondary energy consumption, and is beneficial to promoting the emission reduction and waste utilization of cement enterprises and the low-carbon development. In addition, the low-carbon admixture prepared by the invention is safe and stable, has excellent performance, can be widely applied to cement and concrete, and provides reference and reference for the utilization of carbon dioxide in other industrial waste gases.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The examples, where no specific techniques or conditions are indicated, are all conventional or performed according to the techniques or conditions described in the literature of the art or according to the product specifications. The reagents and instruments used are conventional products which are available from normal commercial vendors, not indicated by manufacturers.
Parts in the following examples represent parts by weight.
In the following examples, the steel slag was converter steel slag, and the steel slag was dried to a water content of less than 1%. The main chemical components of the steel slag powder are CaO (37.8 percent) and Fe 2 O 3 (29.2％)、SiO 2 (11.6％)、 Al 2 O 3 (5.9％)、MgO(10.1％)、P 2 O 5 (1.5％)。
Example 1
The embodiment provides a low-carbon admixture, and the preparation method comprises the following steps:
(1) Grinding the steel slag to 350m of specific surface area 2 Per kg of steel slag powder. 100 parts of steel slag powder, 30 parts of water and 0.5 part of mineralizer are put into a stirrer to be stirred at a low speed for 60s, and then are stirred at a high speed for 180s to be wetted and mixed;
(2) Loosely spreading the mixed wet steel slag powder in a container, putting the container into a tail flue gas bin of a cement kiln for carbonization, and stirring and turning over the steel slag powder material at intervals of 8 hours in the carbonization process;
(3) The carbonization conditions in the cement kiln tail flue gas bin are as follows: CO 2 2 The concentration is about 20%; the carbonization condition is that the temperature is 30 ℃, the humidity is 70 percent, and the carbonization time is 3d;
(4) Taking out the carbonized steel slag powder, drying and grinding the steel slag powder to the specific surface area of 350m 2 And/kg to obtain the steel slag low-carbon admixture.
Example 2
The embodiment provides a low-carbon admixture, and the preparation method comprises the following steps:
(1) Grinding the steel slag to 350m of specific surface area 2 Per kg of steelAnd (5) slag powder. 100 parts of steel slag powder, 0 part of water and 0.7 part of mineralizer are put into a stirrer to be stirred at a low speed for 60s, and then are stirred at a high speed for 180s to be wetted and mixed;
(2) Loosely spreading the mixed wet steel slag powder in a container, putting the container into a tail flue gas bin of a cement kiln for carbonization, and stirring and turning over the steel slag powder material at intervals of 8 hours in the carbonization process;
(3) The carbonization conditions in the cement kiln tail flue gas bin are as follows: CO 2 2 The concentration is about 20%; the carbonization condition is that the temperature is 25 ℃, the humidity is 75 percent, and the carbonization time is 3d;
(4) Taking out the carbonized steel slag powder, drying and obtaining the steel slag low-carbon admixture without grinding.
Example 3
The embodiment provides a low-carbon admixture, and the preparation method comprises the following steps:
(1) Grinding the steel slag to 350m of specific surface area 2 Per kg of steel slag powder. 100 parts of steel slag powder, 20 parts of water and 0.8 part of mineralizer are put into a stirrer to be stirred at a slow speed for 60s, and then are quickly stirred for 120s to be wetted and mixed;
(2) Loosely spreading the mixed wet steel slag powder in a container, putting the container into a tail flue gas bin of a cement kiln for carbonization, and stirring and turning over the steel slag powder material at intervals of 10 hours in the carbonization process;
(3) The carbonization conditions in the cement kiln tail flue gas bin are as follows: CO 2 2 The concentration is about 15%; the carbonization conditions comprise the temperature of 30 ℃, the humidity of 60% and the carbonization time of 3d;
(4) Taking out the carbonized steel slag powder, drying, and grinding to a specific surface area of 360m 2 And/kg to obtain the steel slag low-carbon admixture.
Example 4
The embodiment provides a low-carbon admixture, and a preparation method of the low-carbon admixture comprises the following steps:
(1) Grinding the steel slag to 350m of specific surface area 2 Per kg of steel slag powder. 100 parts of steel slag powder, 50 parts of water and 1.0 part of mineralizer are put into a stirrer to be stirred at a low speed for 60s, and then are stirred at a high speed for 90s to be wetted and mixed;
(2) Loosely spreading the mixed wet steel slag powder in a container, putting the container into a tail flue gas bin of a cement kiln for carbonization, and stirring and turning over the steel slag powder material at intervals of 10 hours in the carbonization process;
(3) The carbonization conditions in the cement kiln tail flue gas bin are as follows: CO 2 2 The concentration is about 20%; the carbonization condition is that the temperature is 40 ℃, the humidity is 50 percent and the carbonization time is 7d;
(4) Taking out the carbonized steel slag powder, drying, and grinding the steel slag powder to the specific surface area of 350m 2 And/kg to obtain the steel slag low-carbon admixture.
Example 5
The embodiment provides a low-carbon admixture, and a preparation method of the low-carbon admixture comprises the following steps:
(1) Grinding the steel slag to 350m of specific surface area 2 Per kg of steel slag powder. 100 parts of steel slag powder, 50 parts of water and 0.8 part of mineralizer are put into a stirrer to be slowly stirred for 30-60s, and then are quickly stirred for 180s to be wetted and mixed;
(2) Loosely spreading the mixed wet steel slag powder in a container, putting the container into a tail flue gas bin of a cement kiln for carbonization, and stirring and turning over the steel slag powder material at intervals of 8 hours in the carbonization process;
(3) The carbonization conditions in the cement kiln tail flue gas bin are as follows: CO 2 2 The concentration is about 25%; the carbonization conditions comprise the temperature of 60 ℃, the humidity of 70% and the carbonization time of 3d;
(4) Taking out the carbonized steel slag powder, drying, and grinding the steel slag powder to the specific surface area of 370m 2 And/kg to obtain the steel slag low-carbon admixture.
Example 6
The embodiment provides a low-carbon admixture, and the preparation method comprises the following steps:
(1) Grinding the steel slag to 350m of specific surface area 2 Per kg of steel slag powder. 100 parts of steel slag powder, 45 parts of water and 1.5 parts of mineralizer are put into a stirrer to be stirred at a low speed for 60s, and then are quickly stirred for 180s to be wetted and mixed;
(2) Loosely spreading the mixed wet steel slag powder in a container, putting the container into a tail flue gas bin of a cement kiln for carbonization, and stirring and turning over the steel slag powder material at intervals of 8 hours in the carbonization process;
(3) Carbonization in cement kiln tail flue gas binThe conditions are as follows: CO 2 2 The concentration is about 20%; the carbonization condition is 35 ℃, the humidity is 60 percent and the carbonization time is 7d;
(4) Taking out the carbonized steel slag powder, drying and grinding the steel slag powder to the specific surface area of 400m 2 And/kg to obtain the steel slag low-carbon admixture.
Example 7
The embodiment provides a low-carbon admixture, and a preparation method of the low-carbon admixture comprises the following steps:
(1) Grinding the steel slag to the specific surface area of 390m 2 Per kg of steel slag powder. 100 parts of steel slag powder, 0 part of water and 0.5 part of mineralizer are put into a stirrer to be stirred at a low speed for 60s, and then are stirred at a high speed for 180s to be wetted and mixed;
(2) Loosely spreading the mixed wet steel slag powder in a container, putting the container into a tail flue gas bin of a cement kiln for carbonization, and stirring and turning over the steel slag powder material at intervals of 10 hours in the carbonization process;
(3) The carbonization conditions in the cement kiln tail flue gas bin are as follows: CO 2 2 The concentration is about 20%; the carbonization condition is 85 ℃, the humidity is 75 percent, and the carbonization time is 3d;
(4) Taking out the carbonized steel slag powder and drying the steel slag powder without grinding to obtain the steel slag low-carbon admixture.
Example 8
The embodiment provides a low-carbon admixture, and a preparation method of the low-carbon admixture comprises the following steps:
(1) Grinding the steel slag to the specific surface area of 420m 2 Per kg of steel slag powder. 100 parts of steel slag powder, 0 part of water and 0.5 part of mineralizer are put into a stirrer to be stirred at a low speed for 60s, and then are stirred at a high speed for 120s to be wetted and mixed;
(2) Loosely spreading the mixed wet steel slag powder in a container, putting the container into a tail flue gas bin of a cement kiln for carbonization, and stirring and turning over the steel slag powder material at intervals of 8 hours in the carbonization process;
(3) The carbonization conditions in the cement kiln tail flue gas bin are as follows: CO 2 2 The concentration is about 20%; the carbonization conditions comprise the temperature of 30 ℃, the humidity of 75% and the carbonization time of 7d;
(4) Taking out the carbonized steel slag powder, drying and grinding the steel slag powder to the specific surface area of 400m 2 And/kg to obtain the steel slag low-carbon admixture.
Comparative example
The present comparative example provides a low carbon admixture, the preparation method of which differs from example 1 only in that: no mineralizer was added. The preparation method comprises the following steps:
(1) Grinding the steel slag to 350m of specific surface area 2 Per kg of steel slag powder. 100 parts of steel slag powder and 30 parts of water are put into a stirrer to be stirred at a low speed for 60s, and then are quickly stirred for 180s to be wetted and mixed;
(2) Loosely spreading the mixed wet steel slag powder in a container, putting the container into a tail flue gas bin of a cement kiln for carbonization, and stirring and turning over the steel slag powder material at intervals of 8 hours in the carbonization process;
(3) The carbonization conditions in the cement kiln tail flue gas bin are as follows: CO 2 2 The concentration is about 20%; the carbonization condition is that the temperature is 30 ℃, the humidity is 70 percent, and the carbonization time is 3d;
(4) Taking out the carbonized steel slag powder, drying and grinding the steel slag powder to the specific surface area of 350m 2 And/kg to obtain the steel slag low-carbon admixture.
Test examples
Further, the steel slag low-carbon admixture prepared in the embodiment is used as a concrete admixture, and the performance of the concrete admixture is tested by the following specific operations:
(1) The measuring method comprises the following steps: the performance index test of the steel slag low-carbon admixture refers to the national standard GB/T20491-2017 steel slag powder used in cement and concrete;
(2) The test results are shown in Table 1, wherein the control group is untreated steel slag powder.
TABLE 1 Performance test results for low-carbon steel slag admixtures
As can be seen from table 1, after the steel slag powder is carbonized by using the cement kiln tail flue gas to prepare the low-carbon admixture powder, the f-CaO content of the prepared steel slag low-carbon admixture is reduced to below 0.7% from 3.21% originally, the 7d activity index of the steel slag low-carbon admixture reaches 77-89%, the 28d activity index reaches 76-91%, the 7d activity index can be improved by 9-19%, and the 28d activity index can be improved by 4-16%.
In summary, the method for preparing the low-carbon admixture by using the cement kiln tail flue gas provided by the invention can improve the gelling activity of the steel slag, can well solidify and utilize low-concentration carbon dioxide in the cement kiln flue gas, solves the problem of carbon dioxide emission in industries such as cement, steel, thermal power, coal chemical industry and the like, effectively improves the large-scale comprehensive utilization rate of the steel slag, treats waste by waste, changes waste into valuable, and realizes double reduction and resource utilization of industrial waste gas carbon dioxide and solid waste.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A method for preparing a low-carbon admixture by using cement kiln tail gas is characterized by comprising the following steps: taking steel slag powder and a mineralizer as raw materials, and mixing the steel slag powder and the mineralizer according to the weight ratio of 100: 0.5-2, and then carrying out carbonization reaction in the tail flue gas of the cement kiln to prepare a low-carbon admixture;
the weight content of CaO in the steel slag powder is more than 30 percent;
the mineralizer is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, calcium hydroxide or calcium carbonate.
2. The method of claim 1, wherein the steel slag powder is derived from at least one of electric furnace steel slag, converter steel slag, or open hearth steel slag.
3. The method for preparing the low-carbon admixture by using the cement kiln tail gas as claimed in claim 1 or 2, wherein the CO in the cement kiln tail gas 2 The concentration of (A) is 10-25%.
4. The method for preparing the low-carbon admixture by using the cement kiln tail gas as claimed in any one of claims 1 to 3, wherein the temperature of the carbonization reaction is 25-90 ℃ and the humidity is 25-75%.
5. The method of utilizing cement kiln tail gas to prepare a low carbon admixture according to claim 1 wherein the feedstock further comprises water; the weight ratio of water to steel slag powder is 10-50:100.
6. the method for preparing the low-carbon admixture by using the cement kiln tail gas as claimed in claim 1, wherein the water content of the steel slag powder is less than 1%, and the specific surface area is 350-450m 2 /kg。
7. The method for preparing a low carbon admixture using cement kiln tail gas according to any one of claims 1 to 6, comprising the steps of:
(1) The prepared water content is less than 1 percent, and the specific surface area is 350-450m 2 Per kg of steel slag powder;
(2) And (2) mixing the steel slag powder and a mineralizer according to the weight ratio of 100: after 0.5 to 2 parts of the mixture is mixed,
or, mixing the steel slag powder, the mineralizer and water according to the weight ratio of 100:0.5 to 2:10-50, performing carbonization reaction in the tail flue gas of the cement kiln, and stirring the materials at intervals of 6-12 h;
wherein the weight content of CaO in the steel slag powder is more than 30%; the mineralizer is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, calcium hydroxide or calcium carbonate;
(3) And carrying out the carbonization reaction for 2-7 days to obtain the low-carbon admixture.
8. A low carbon admixture characterized in that it is obtainable by the process for the preparation of a low carbon admixture according to any one of claims 1 to 7.
9. The low carbon admixture of claim 8, wherein the low carbon admixture has a free CaO content of 0.7% or less.
10. Use of the low carbon admixture of claim 8 or 9 in construction engineering, preferably as a mineral admixture for concrete.
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