CN116444222A - Preparation method for preparing light high-strength foam concrete by high-calcium solid waste carbonization - Google Patents
Preparation method for preparing light high-strength foam concrete by high-calcium solid waste carbonization Download PDFInfo
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- CN116444222A CN116444222A CN202310194063.4A CN202310194063A CN116444222A CN 116444222 A CN116444222 A CN 116444222A CN 202310194063 A CN202310194063 A CN 202310194063A CN 116444222 A CN116444222 A CN 116444222A
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- 239000011381 foam concrete Substances 0.000 title claims abstract description 45
- 238000003763 carbonization Methods 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000011575 calcium Substances 0.000 title claims abstract description 17
- 239000002910 solid waste Substances 0.000 title claims abstract description 17
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 101
- 239000002893 slag Substances 0.000 claims abstract description 101
- 239000010959 steel Substances 0.000 claims abstract description 101
- 239000004568 cement Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000006260 foam Substances 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 239000003381 stabilizer Substances 0.000 claims abstract description 14
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 13
- 239000002105 nanoparticle Substances 0.000 claims abstract description 13
- 239000013078 crystal Substances 0.000 claims abstract description 12
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 17
- 239000004088 foaming agent Substances 0.000 claims description 14
- 238000005187 foaming Methods 0.000 claims description 12
- 238000001238 wet grinding Methods 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 10
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical group OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 9
- 238000010000 carbonizing Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 239000000725 suspension Substances 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 5
- 229920001661 Chitosan Polymers 0.000 claims description 4
- BVHLGVCQOALMSV-JEDNCBNOSA-N L-lysine hydrochloride Chemical group Cl.NCCCC[C@H](N)C(O)=O BVHLGVCQOALMSV-JEDNCBNOSA-N 0.000 claims description 4
- 238000001723 curing Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000007790 solid phase Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000009837 dry grinding Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 108010082495 Dietary Plant Proteins Proteins 0.000 claims description 2
- 239000008346 aqueous phase Substances 0.000 claims description 2
- 239000007795 chemical reaction product Substances 0.000 claims description 2
- 238000004108 freeze drying Methods 0.000 claims description 2
- 239000002440 industrial waste Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 239000004094 surface-active agent Substances 0.000 claims description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract description 23
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract 1
- 230000036571 hydration Effects 0.000 description 11
- 238000006703 hydration reaction Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000292 calcium oxide Substances 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- 239000004567 concrete Substances 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- 239000011148 porous material Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 229910021532 Calcite Inorganic materials 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 235000012241 calcium silicate Nutrition 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- -1 silicon ions Chemical class 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 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
- 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
- 238000005266 casting Methods 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 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
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 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
- 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
- C04B28/04—Portland cements
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/383—Whiskers
-
- 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
-
- 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
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application discloses a preparation method for preparing light high-strength foam concrete by high-calcium solid waste carbonization. The light high-strength foam concrete comprises the following raw materials in parts by weight: 50-88 parts of cement, 10-40 parts of micron-sized steel slag, 2-10 parts of nano-sized steel slag, 40 parts of water, 3-4 parts of foam, 1-2 parts of crystal stabilizer, 1-2 parts of polycarboxylate water reducer and 1-2 parts of auxiliary agent. The preparation method selects the steel slag as the raw material for preparation, realizes high-value utilization of the waste slag, reduces the cement consumption, and simultaneously prepares the steel slag rich in superfine aragonite whiskers in a carbonization mode, so that the foam concrete has the characteristics of good compressive strength, good flexural strength, small dry density, energy conservation, environmental protection and the like.
Description
Technical Field
The application relates to the technical field of building materials, in particular to a preparation method for preparing light high-strength foam concrete by carbonizing high-calcium solid wastes.
Background
The foam concrete is light concrete which is prepared by taking cement-based cementing materials, admixtures and the like as main cementing materials, adding additives and water to prepare slurry, foaming by a foaming agent, casting, molding and curing. Compared with common concrete, the foam concrete has the characteristics of small density, low heat conductivity coefficient, good fire resistance, good heat preservation and insulation performance and the like because a large number of air holes exist in the foam concrete. However, foam concrete has the problem of long initial setting time, especially common Portland cement which is most widely used, and the initial setting time is much later than 45 minutes, so that the early strength of the foam concrete is generally low. Meanwhile, if the foam stability is poor, the initial setting of cementing materials such as cement is not reached, and the foam is broken, air holes cannot be formed in the concrete. Therefore, how to improve the strength and foam stability of the foam concrete is a technical key for preparing the foam concrete.
Steel slag is one of the bulk solid wastes with lower utilization rate for iron and steel enterprises. The large amount of accumulated steel slag occupies land, and chemical components in the steel slag pollute the surrounding environment, so how to use the steel slag with high added value becomes a problem to be solved urgently in the metallurgical industry at present.
The steel slag is mainly oxide formed by oxidizing elements contained in molten iron and scrap steel, and the main components of the steel slag are oxides of calcium, iron, silicon, magnesium, aluminum, manganese, phosphorus and the like, wherein CaO accounts for about 30% -60%, and SiO 2 About 8-23%, al 2 O 3 About 3% -8%, mgO about 4% -11%, and a small amount of elemental iron. The steel slag contains a large amount of free calcium oxide and tricalcium silicate (3cao.sio) 2 ) Dicalcium silicate (2 CaO. SiO) 2 ) Tricalcium aluminate (3 CaO. Al) 2 O 3 ) Tetracalcium aluminoferrite (4 CaO. Al) 2 O 3 ·Fe 2 O 3 ) The equal mineral phase has hydraulic gel property, and C-S-H gel generated by reaction when meeting water has certain strength, so the steel slag can be used for replacing cement in the field of foam concrete.
However, since the main component of the steel slag contains relatively more inert phases, the hydration activity of the steel slag is relatively low, so that the early strength of the steel slag-based foam concrete is low, and the compressive strength and the flexural strength of the foam concrete are negatively affected.
Disclosure of Invention
In view of the above, the present application provides a method for preparing light high-strength foam concrete by carbonizing high-calcium solid wastes, which can solve the problem of low compressive strength and flexural strength of foam concrete.
The application provides a preparation method for preparing light high-strength foam concrete by high-calcium solid waste carbonization, which comprises the following steps:
A. providing a micron-sized steel slag slurry with the grain size grading of 0.39-0.81 mu m and a nanometer-sized steel slag slurry with the grain size grading of 0.24-0.36 mu m;
B. respectively enabling the micron-sized steel slag slurry and the nano-sized steel slag slurry to form steel slag slurry suspension liquid under the addition of a stabilizing agent, and adding CO 2 Injecting gas into the steel slag slurry suspension for carbonization, and separating solid phase components from the carbonization reaction product liquid to obtain carbonized micron-sized steel slag and carbonized nanometer-sized steel slag;
C. preparing raw material components of the foam concrete, namely 50-88 parts of cement, 10-40 parts of carbonized micron-sized steel slag, 2-10 parts of carbonized nanometer-sized steel slag, 1-2 parts of polycarboxylate water reducer and a foaming agent according to parts by weight, and curing and forming the raw material components of the foam concrete to obtain the light high-strength foam concrete.
Suitably, but not limited to, in the step a, the method for obtaining the micro-scale steel slag slurry and the nano-scale steel slag slurry comprises the following steps:
a1, sequentially removing iron from steel slag, grinding and screening to obtain steel slag powder;
a2, carrying out wet grinding on the steel slag powder in an auxiliary agent by taking water as a medium, wherein the wet grinding is carried out until a first time to obtain micron-sized steel slag slurry, and the wet grinding is carried out until a second time to obtain nano-sized steel slag slurry.
Suitably, but not limitatively, in step A1:
the steel slag is steel industrial waste slag; the density of the obtained steel slag powder is 3.0-3.3kg/m 3 The color is brown gray, the specific surface area is 400-450m 2 /kg；
Preferably, the grain size of the steel slag powder is 20-25 mu m;
preferably, the grinding is dry grinding for 20-40min.
Suitably, but not limitatively, in step A2:
the first time is 40min, and the second time is 60min;
preferably, the auxiliary agent is triethanolamine.
Suitably, but not limitatively, in step A2, the wet milling process has a ball to ball ratio of 1:3, milling balls of 1.0-1.2mm and mill rotation speed of 350-400r/min.
Suitably, but not limitatively, in step B, the crystal stabilizer is L-lysine hydrochloride and chitosan in a weight ratio of 1:3, mixing to obtain the mixed crystal stabilizer.
Suitably, but not limitatively, in step B:
the carbonization process is to inject CO with the concentration of 20% into an aqueous phase system at the temperature of 80 ℃ and the flow rate of 1L/min 2 Gas, stirring, and carbonizing for 10-12h;
preferably, the separation of the solid phase component is specifically to filter out the filter residue from the carbonized suspension, and then freeze-drying the filter residue.
Suitably, but not limitatively, in step C, the cement is Portland cement, type p.i 42.5; the water-gel ratio was 0.4.
Suitably, but not limitatively, in step C, the foaming agent is prepared by: adding a foaming agent into water to obtain a foaming agent solution, and obtaining foam in a mechanical foaming mode; the foaming agent is a vegetable protein compound surfactant, and the mass ratio of the foaming agent to water is 1:60.
suitably, but not limited to, in step C, the polycarboxylate water reducer is a long-side group low molecular weight polycarboxylate water reducer.
The application has the following beneficial effects:
(1) Compared with pure cement foam concrete, the invention has the advantages of environmental protection, low energy consumption, high strength, reduced energy waste, and solidification and sealing of CO, and uses the steel slag to replace part of cement as the cementing material 2 Realizes the resource utilization of solid waste and has obvious economic and environmental benefits.
(2) The preparation method of the light high-strength foam concrete prepared by high-calcium solid waste carbonization applies a wet grinding technology, and the steel slag is mutually collided and extruded in the wet grinding process to damage the structure of the steel slag surface, so that the dissolution of calcium ions and silicon ions in the steel slag and the entry of hydroxyl ions in a solution are promoted, the grain size of the steel slag after wet grinding can reach the nanometer level, the specific surface area is increased, the activity is increased, the hydration process of a system is accelerated, and more C-S-H gel is generated, so that the stability of foam is improved, and the strength of foam concrete is also improved.
(3) The auxiliary agent of the application is triethanolamine and has the main effects as follows:
first, triethanolamine is used as a strong polar small molecule, and is reacted with C by acid-base acting force 3 A、C 4 Al on AF surface 3 + 、Fe 3+ The plasma cationic groups are selectively bonded, so that the polar surface energy and the total surface energy ratio are obviously reduced; at the same time, the C-C single bond in the molecule bonds it to C 3 S、C 2 Van der Waals forces also exist between S, resulting in a reduction in dispersive surface energy. The triethanolamine neutralizes unsaturated charges through adsorption, reduces the surface energy of steel slag powder particles, prevents the steel slag particles from mutually approaching to each other to generate agglomeration and section healing, and achieves the grinding-assisting effect;
second, the triethanolamine is in the molecular structureThe presence of an unshared electron pair on the central N atom enables triethanolamine to react with the metal ion Fe in the slurry 3+ 、Al 3+ Complexing occurs, so that the solubility of metal ions in the slurry is improved, the diffusion of the metal ions in the slurry is accelerated, and the dissolution rate of intermediate minerals is accelerated, thereby accelerating the hydration rate;
thirdly, triethanolamine accelerates the generation of hexagonal calcium aluminate hydrate which is an aluminate mineral hydration product, and can promote the transformation of hexagonal calcium aluminate hydrate into cubic crystal form, thereby further accelerating C 3 Hydration of A;
fourth, triethanolamine is purified by inhibiting C 3 A forms a loose structure at the initial stage of hydration so as to improve the compactness and strength of the cement stone.
(4) During carbonization of steel slag, ca dissolved in steel slag clinker 2+ With CO 2 Reacting to form aragonite, calcite or amorphous calcium carbonate; the L-lysine hydrochloride in the solution can amorphize calcite, the chitosan can promote the generation of aragonite whisker, and the compound use of the L-lysine hydrochloride and the chitosan can promote the generation of aragonite calcium carbonate and inhibit the crystallization and precipitation of the calcite calcium carbonate to influence the mechanical property; therefore, the slag rich in aragonite whisker after carbonization has amorphous phase, and the surface area is very large, so that the slag rich in aragonite whisker has high activity, and can be used as a nucleation site for accelerating cement hydration. In addition, the amorphous phase has very high pozzolanic reactivity, which consumes Ca in the pore solution 2+ This further promotes and accelerates the hydration of the cement. In addition, the aragonite phase formed after the steel slag is carbonized has a certain acceleration effect on cement hydration due to nucleation effect. Therefore, the carbonized steel slag can accelerate the hydration of cement, shorten the initial setting time of foam concrete and strengthen the early strength of the foam concrete.
(5) The steel slag is carbonized to form micron-sized aragonite whiskers, and the main functions are as follows:
firstly, the compression strength of the foaming cement can be effectively improved by the micron-sized aragonite whisker, the micron-sized aragonite whisker can be bonded with hydration products and unhydrate in a foaming cement matrix to form a three-dimensional net structure with a supporting function, so that the overall strength of the foaming cement can be improved, when the foaming cement is subjected to external force, the micron-sized aragonite whisker in the foaming cement can bear part of energy and can restrict the expansion of cracks, the whisker crossing at two ends of the cracks can play a connecting role to prevent the cracking of the foaming cement, and meanwhile, the micron-sized aragonite whisker can further compact the foaming concrete, reduce microcracks and greatly improve the fracture resistance of the foaming concrete;
secondly, in the stirring process of the slurry, the micron-sized aragonite whisker can divide large bubbles into smaller bubbles, so that the pore diameter of the foaming cement is reduced, and the pore diameter is more uniform. Therefore, the micron-sized aragonite whisker can improve the compressive strength of the foamed cement by improving the cell structure of the foamed cement;
thirdly, the low surface adhesion between the micron-sized aragonite whiskers and the cement paste can lead to high porosity of the foam concrete, so that the lightweight foam concrete with low dry density is obtained.
(6) The nano aragonite whisker generated by carbonization of steel slag can stabilize foam, improve volume stability, and can form an interpenetrating network structure with hydrated calcium silicate to strengthen microscopic mechanical properties of a pore wall structure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below in connection with the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.
< preparation method >
The preparation method for preparing the light high-strength foam concrete by carbonizing the high-calcium solid waste provided by the embodiment comprises the following steps:
step 1, the steel slag is firstly subjected to magnetic field intensity of 5 multiplied by 10 5 Carrying out iron removal treatment by a dry magnetic separator of A/m, carrying out dry grinding for 20-40min, and finally obtaining steel slag powder of 20-25 mu m through screening;
step 2, mixing the steel slag with 1.5 parts of auxiliary agent and water, and performing wet grinding for 40-60min, wherein after the wet grinding for 40min and 60min respectively, steel slag slurry with the grain size grading of 0.39-0.81 mu m and 0.24-0.36 mu m is obtained;
step 3, mixing the micrometer steel slag and the nanometer steel slag slurry with a stabilizer to prepare steel slag slurry suspension, and then mixing CO 2 Injecting gas into the suspension, carbonizing to generate steel slag slurry, and finally, filtering and drying to obtain carbonized micro-scale steel slag and nano-scale steel slag;
step 4, taking cement, carbonized micron-sized steel slag, carbonized nano-sized steel slag and water, adding a polycarboxylate water reducer, and uniformly stirring to obtain steel slag-cement slurry; then mixing the foaming agent with water according to the proportion of 1:60, mixing; finally, the slurry is mixed with the foam and stirred uniformly;
and 5, vibrating, forming and curing to obtain the light high-strength foam concrete.
The following examples were carried out according to the above preparation methods, and these specific examples differ only in the raw material composition in step 3 as embodied in each specific example.
Example 1:
the preparation method for preparing the light high-strength foam concrete by carbonizing the high-calcium solid waste comprises the following steps of 60 parts of cement, 35 parts of micron-sized steel slag, 5 parts of nano-sized steel slag, 40 parts of water, 3.5 parts of foam and 3.5 parts of crystal stabilizer MgCl in parts by weight 2 1 part of water reducer 1.5 parts of auxiliary agent 1.5 parts, and the carbonization time is 12 hours.
Example 2:
the preparation method for preparing the light high-strength foam concrete by carbonizing the high-calcium solid waste comprises the following steps of 65 parts of cement, 30 parts of micron-sized steel slag, 5 parts of nano-sized steel slag, 40 parts of water, 3.5 parts of foam and 3.5 parts of crystal stabilizer MgCl in parts by weight 2 1 part of water reducer 1.5 parts of auxiliary agent 1.5 parts, and the carbonization time is 12 hours.
Example 3:
the high-calcium solid waste carbonization preparation light high-strength foam concrete provided by the embodiment comprises, by weight, 70 parts of cement, 25 parts of micron-sized steel slag, 5 parts of nano-sized steel slag, 40 parts of water, 3.5 parts of foam and a crystal stabilizer MgCl 2 1 part of water reducer 1.5 parts of auxiliary agent 1.5 parts, and the carbonization time is 12 hours.
Example 4:
the high-calcium solid waste carbonization preparation light high-strength foam concrete provided by the embodiment comprises, by weight, 70 parts of cement, 20 parts of micron-sized steel slag, 10 parts of nano-sized steel slag, 40 parts of water, 3.5 parts of foam and a crystal stabilizer MgCl 2 1 part of polycarboxylate water reducer 1.5 parts, 1.5 parts of auxiliary agent and carbonization time of 12 hours.
Example 5:
the high-calcium solid waste carbonization preparation light high-strength foam concrete provided by the embodiment comprises 75 parts of cement, 15 parts of micron-sized steel slag, 10 parts of nano-sized steel slag, 40 parts of water, 3.5 parts of foam and a crystal stabilizer MgCl in parts by weight 2 1 part of polycarboxylate water reducer 1.5 parts, 1.5 parts of auxiliary agent and carbonization time of 12 hours.
Example 6:
the high-calcium solid waste carbonization preparation light high-strength foam concrete provided by the embodiment comprises, by weight, 80 parts of cement, 10 parts of micron-sized steel slag, 10 parts of nano-sized steel slag, 40 parts of water, 3.5 parts of foam and a crystal stabilizer MgCl 2 1 part of water reducer 1.5 parts of auxiliary agent 1.5 parts, and the carbonization time is 12 hours.
Comparative example 1
The only difference from example 1 is that the steel slag slurry obtained in step 2 has a grain size grading of 2.4. Mu.m.
Comparative example 2
The only difference from example 1 is that the steel slag slurry obtained in step 2 has a grain size grading of 0.10 μm.
Comparative example 3
The only difference from example 1 is that the nano-scale steel slag is 15 parts.
Comparative example 4
The only difference from example 1 is that the nano-scale steel slag is 0.5 parts.
After the foam concretes prepared in the above examples and comparative examples were dried to a constant weight, compressive strength, dry density, flexural strength and crack length rate were tested according to JC/T2357-2016 Standard of test method for Performance of foam concrete products, and the specific results are shown in Table 1 below.
TABLE 1 test results for examples 1-6 and comparative examples 1-4 of the present application
In summary, the embodiment of the invention has the following beneficial effects: the light high-strength foam concrete prepared in the embodiments 1-6 has the characteristics of high compressive strength and high flexural strength. Meanwhile, due to the toughening effect of the aragonite fiber, the foam concrete product has good crack resistance and can be applied to the production of novel wall materials.
The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application.
Claims (10)
1. The preparation method for preparing the light high-strength foam concrete by carbonizing the high-calcium solid waste is characterized by comprising the following steps of:
A. providing a micron-sized steel slag slurry with the grain size grading of 0.39-0.81 mu m and a nanometer-sized steel slag slurry with the grain size grading of 0.24-0.36 mu m;
B. respectively enabling the micron-sized steel slag slurry and the nano-sized steel slag slurry to form steel slag slurry suspension liquid under the addition of a stabilizing agent, and adding CO 2 Injecting gas into the steel slag slurry suspension for carbonization, and separating solid phase components from the carbonization reaction product liquid to obtain carbonized micron-sized steel slag and carbonized nanometer-sized steel slag;
C. preparing raw material components of the foam concrete, namely 50-88 parts of cement, 10-40 parts of carbonized micron-sized steel slag, 2-10 parts of carbonized nanometer-sized steel slag, 1-2 parts of polycarboxylate water reducer and a foaming agent according to parts by weight, and curing and forming the raw material components of the foam concrete to obtain the light high-strength foam concrete.
2. The preparation method according to claim 1, wherein in the step a, the method for obtaining the micron-sized steel slag slurry and the nano-sized steel slag slurry comprises the following steps:
a1, sequentially removing iron from steel slag, grinding and screening to obtain steel slag powder;
a2, carrying out wet grinding on the steel slag powder in an auxiliary agent by taking water as a medium, wherein the wet grinding is carried out until a first time to obtain micron-sized steel slag slurry, and the wet grinding is carried out until a second time to obtain nano-sized steel slag slurry.
3. The method according to claim 2, wherein in step A1:
the steel slag is steel industrial waste slag; the density of the obtained steel slag powder is 3.0-3.3kg/m 3 The color is brown gray, the specific surface area is 400-450m 2 /kg；
Preferably, the grain size of the steel slag powder is 20-25 mu m;
preferably, the grinding is dry grinding for 20-40min.
4. The method according to claim 2, wherein in step A2:
the first time is 40min, and the second time is 60min;
preferably, the auxiliary agent is triethanolamine.
5. The method according to claim 2, wherein in the step A2, the ball-to-material ratio is 1:3, the grinding balls are 1.0-1.2mm, and the rotating speed of the mill is 350-400r/min.
6. The preparation method according to claim 1, wherein in the step B, the crystal stabilizer is L-lysine hydrochloride and chitosan in a weight ratio of 1:3, mixing to obtain the mixed crystal stabilizer.
7. The method according to claim 1, wherein in step B:
the carbonization process is to inject CO with the concentration of 20% into an aqueous phase system at the temperature of 80 ℃ and the flow rate of 1L/min 2 Gas, stirring, and carbonizing for 10-12h;
preferably, the separation of the solid phase component is specifically to filter out the filter residue from the carbonized suspension, and then freeze-drying the filter residue.
8. The method according to claim 1, wherein in the step C, the cement is Portland cement, and the model is PxI 42.5; the water-gel ratio was 0.4.
9. The preparation method according to claim 1, wherein in the step C, the foaming agent is prepared by: adding a foaming agent into water to obtain a foaming agent solution, and obtaining foam in a mechanical foaming mode; the foaming agent is a vegetable protein compound surfactant, and the mass ratio of the foaming agent to water is 1:60.
10. the method of claim 1, wherein in step C, the polycarboxylate water reducer is a long-side-group low molecular weight polycarboxylate water reducer.
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| CN117185755A (en) * | 2023-09-01 | 2023-12-08 | 华新水泥股份有限公司 | High-strength carbonized aerated concrete and preparation method thereof |
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