CN117003534B - Carbon sealing method and device for autoclaved aerated concrete products - Google Patents
Carbon sealing method and device for autoclaved aerated concrete products Download PDFInfo
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- CN117003534B CN117003534B CN202310953365.5A CN202310953365A CN117003534B CN 117003534 B CN117003534 B CN 117003534B CN 202310953365 A CN202310953365 A CN 202310953365A CN 117003534 B CN117003534 B CN 117003534B
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- gas
- solid waste
- slurry
- carbon dioxide
- aerated concrete
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- 239000004567 concrete Substances 0.000 title claims abstract description 204
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 138
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 137
- 238000000034 method Methods 0.000 title claims abstract description 93
- 238000007789 sealing Methods 0.000 title claims abstract description 32
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 408
- 239000007789 gas Substances 0.000 claims abstract description 394
- 239000002910 solid waste Substances 0.000 claims abstract description 242
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 204
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 204
- 238000001238 wet grinding Methods 0.000 claims abstract description 193
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 57
- 239000003546 flue gas Substances 0.000 claims abstract description 57
- 230000008569 process Effects 0.000 claims abstract description 30
- 239000002002 slurry Substances 0.000 claims description 268
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 101
- 238000000227 grinding Methods 0.000 claims description 89
- 239000000463 material Substances 0.000 claims description 85
- 239000000292 calcium oxide Substances 0.000 claims description 79
- 239000002994 raw material Substances 0.000 claims description 70
- 238000011084 recovery Methods 0.000 claims description 69
- 238000004064 recycling Methods 0.000 claims description 62
- 238000003756 stirring Methods 0.000 claims description 61
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 57
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 48
- 239000011268 mixed slurry Substances 0.000 claims description 48
- 239000002245 particle Substances 0.000 claims description 43
- 238000003860 storage Methods 0.000 claims description 43
- 239000002893 slag Substances 0.000 claims description 40
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 35
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 33
- 239000000654 additive Substances 0.000 claims description 29
- 230000009919 sequestration Effects 0.000 claims description 29
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 28
- 239000011574 phosphorus Substances 0.000 claims description 28
- 229910052698 phosphorus Inorganic materials 0.000 claims description 28
- 238000003763 carbonization Methods 0.000 claims description 27
- 238000004140 cleaning Methods 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 230000000996 additive effect Effects 0.000 claims description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 24
- 239000011737 fluorine Substances 0.000 claims description 24
- 229910052731 fluorine Inorganic materials 0.000 claims description 24
- 239000010881 fly ash Substances 0.000 claims description 24
- 239000010440 gypsum Substances 0.000 claims description 24
- 229910052602 gypsum Inorganic materials 0.000 claims description 24
- 230000000284 resting effect Effects 0.000 claims description 23
- 239000002699 waste material Substances 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 15
- 238000000926 separation method Methods 0.000 claims description 13
- 239000011575 calcium Substances 0.000 claims description 12
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 12
- 238000012546 transfer Methods 0.000 claims description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 229910052791 calcium Inorganic materials 0.000 claims description 10
- 229920003086 cellulose ether Polymers 0.000 claims description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000011777 magnesium Substances 0.000 claims description 9
- 229910052749 magnesium Inorganic materials 0.000 claims description 9
- 229920002401 polyacrylamide Polymers 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000006260 foam Substances 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 239000003381 stabilizer Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 241000931143 Gleditsia sinensis Species 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000000779 smoke Substances 0.000 claims description 6
- 239000011499 joint compound Substances 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 3
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 3
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- 150000002191 fatty alcohols Chemical class 0.000 claims description 3
- 239000004088 foaming agent Substances 0.000 claims description 3
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 3
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 3
- 239000000344 soap Substances 0.000 claims description 3
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000003801 milling Methods 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000009467 reduction Effects 0.000 abstract description 5
- 230000006872 improvement Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 109
- 235000012255 calcium oxide Nutrition 0.000 description 77
- 239000000203 mixture Substances 0.000 description 36
- 230000001276 controlling effect Effects 0.000 description 32
- 239000003570 air Substances 0.000 description 27
- 238000007599 discharging Methods 0.000 description 24
- 230000000694 effects Effects 0.000 description 24
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 23
- 238000004458 analytical method Methods 0.000 description 23
- 238000005520 cutting process Methods 0.000 description 23
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 22
- 238000005259 measurement Methods 0.000 description 22
- 239000003469 silicate cement Substances 0.000 description 18
- 230000000149 penetrating effect Effects 0.000 description 7
- 230000003068 static effect Effects 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 239000004566 building material Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910001420 alkaline earth metal ion Inorganic materials 0.000 description 4
- 230000033558 biomineral tissue development Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 108010084592 Saporins Proteins 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical class [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910000863 Ferronickel Inorganic materials 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- HBYOLNPZXLHVQA-UHFFFAOYSA-J dicalcium dicarbonate Chemical compound [Ca+2].[Ca+2].[O-]C([O-])=O.[O-]C([O-])=O HBYOLNPZXLHVQA-UHFFFAOYSA-J 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- -1 silicon-aluminum-oxygen Chemical compound 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
- C04B40/0236—Carbon dioxide post-treatment of already hardened material
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2111/40—Porous or lightweight 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)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- General Chemical & Material Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a carbon sealing method and device for autoclaved aerated concrete products, and belongs to the technical field of industrial carbon reduction. According to the invention, through the improvement of wet grinding process parameters and devices, the high-efficiency carbon fixation of solid wastes is realized, and the method is used for preparing autoclaved aerated concrete products, so that the method not only can be used for absorbing industrial flue gas and capturing carbon dioxide gas in the production process of autoclaved aerated concrete products and in a chemical industrial park, but also can be used for guaranteeing the performance of autoclaved aerated concrete products, and has remarkable carbon reduction benefits.
Description
Technical Field
The invention relates to the technical field of industrial carbon reduction and carbon reduction, in particular to a carbon sealing method and device for autoclaved aerated concrete products.
Background
And the green low-carbon building material is developed to replace the building material with high energy consumption and high carbon emission. With the continuous improvement of environmental protection requirements, the comprehensive utilization of solid wastes is a requirement for comprehensive utilization of resources and improvement of utilization efficiency of the resources.
Autoclaved aerated concrete products are important building materials, and include autoclaved aerated blocks, autoclaved aerated boards and other product types. The autoclaved aerated concrete has the characteristics of light weight, heat preservation, sound absorption, fire resistance, shock resistance, easy processing and the like, the dry density can reach 300-800 kg/m 3, which is only one third to one eighth of that of common concrete, and the heat conductivity coefficient is generally lower than 0.2W/(m.k) due to the existence of a large number of closed pores in the autoclaved aerated concrete, and the sound absorption coefficient can reach 0.2-0.4, thus the autoclaved aerated concrete is a good heat preservation, heat insulation and sound absorption material. Therefore, the composite material can be used as a non-bearing peripheral heat insulation material in the building and also can be used as a bearing building block of a low-rise building, and is an important material for improving the energy conservation of the building.
However, autoclaved aerated concrete needs to be cured at high temperature and high pressure for the purpose of light weight and high mechanical strength, consumes a lot of energy, and is accompanied by carbon dioxide emission. The collection and utilization of carbon dioxide are subject to higher cost, so that the recycling of carbon dioxide discharged from the production of autoclaved aerated concrete products has important practical significance. Solidifying and sequestering carbon dioxide with a substantial amount of alkaline earth ions in the solid waste and converting it into a cementitious material is a carbon reduction process with great potential. However, alkaline earth metal ions in solid wastes are often present in the form of relatively stable amorphous or crystalline forms, and soluble alkaline earth metal ions are limited. The conventional method is difficult to effectively dissolve out soluble alkaline earth metal ions, so that the carbon fixation efficiency is low, the carbon fixation amount is small, and the application of the carbon fixation gel material in the aspect of building materials is hindered.
Therefore, how to promote ion elution with carbon fixation and carbon sequestration potential in solid wastes is a key to the carbon fixation process based on the tremendous yield of autoclaved aerated concrete products. Through the carbon mineralization reaction and the application of the carbon mineralization reaction in preparing autoclaved aerated concrete materials, carbon emission in the production process of autoclaved aerated concrete can be absorbed, and simultaneously, carbon dioxide gas obtained by carbon dioxide-rich industrial flue gas or paving around an industrial park can be absorbed, so that the development of green building materials can be effectively promoted.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, in a first aspect of the present invention, a high-efficiency and environment-friendly carbon sequestration method for autoclaved aerated concrete products is provided, comprising the steps of:
(1) Pressurizing a carbon dioxide gas source to obtain pressurized gas; the solid waste is mixed by water injection to obtain solid waste slurry;
(2) Wet grinding the solid waste slurry in the pressurized gas atmosphere to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, collecting the wet grinding residual gas which is not lower than the set concentration, recycling the wet grinding residual gas as a carbon dioxide gas source, and directly recycling the wet grinding residual gas which is lower than the set concentration;
(3) Mixing the carbonized solid waste slurry with the solid waste, the auxiliary materials and the additives which are not carbonized, or mixing the carbonized solid waste slurry with the auxiliary materials and the additives only to obtain mixed slurry; the mixed slurry is subjected to resting treatment under set conditions to obtain an aerated concrete blank;
(4) Performing autoclaved curing on the aerated concrete blank body under the carbon dioxide atmosphere with set concentration to obtain an autoclaved aerated concrete product; after the autoclaved curing is finished, the autoclaved residual gas is recovered and is used as a carbon dioxide gas source for recycling.
Preferably, in the step (1), the concentration of carbon dioxide in the carbon dioxide gas source is more than or equal to 5%, the concentration of sulfur dioxide is less than or equal to 2%, and the content of other components meets the requirements of GB 13223-2011.
Preferably, in the step (1), the carbon dioxide gas source comprises industrial flue gas or captured recovered carbon dioxide gas.
Preferably, in the step (1), the pressure of the pressurized gas is 0.2 to 0.35MPa.
Preferably, in the step (1), the total content of calcium oxide and silicon oxide in the solid waste is more than or equal to 25wt.%; the median particle size of the solid waste is less than or equal to 300 mu m.
Preferably, in the step (1), the solid waste includes at least one of steel slag, construction waste micropowder, fly ash, high-calcium fly ash, red mud, slag, magnesium slag, phosphorus slag, aerated block waste, nickel slag and copper slag.
Preferably, in the step (1), the mass ratio of the solid waste to the water is 1:0.8 to 5.
Preferably, in the step (2), in the wet grinding treatment, the conveying rate of the solid waste slurry is 30-70L/min, and the ball-to-material ratio of the grinding balls to the solid waste slurry is 1: 0.2-2, wet milling speed is 200-800 rpm.
Preferably, in the step (2), collecting wet-milling residual gas with carbon dioxide concentration more than or equal to 5%, recycling the wet-milling residual gas as a carbon dioxide gas source, and directly recovering the wet-milling residual gas with carbon dioxide concentration less than 5%.
Preferably, in the step (3), the auxiliary materials comprise cement, lime and gypsum; the additive comprises an air entraining agent and a foam stabilizer.
Further preferably, the total amount of the solid waste and the carbonized solid waste slurry is 480 parts by weight, wherein the amount of the carbonized solid waste slurry is 48 to 480 parts; the cement is 90-120 parts, the lime is 50-85 parts, and the gypsum is 15-25 parts; the air entraining agent is 5-10 parts, and the foam stabilizer is 0.8-1.3 parts.
Further preferably, the cement is Portland cement or Portland cement, and the strength grade is 42.5; the calcium oxide content of the lime is more than or equal to 85 percent; the gypsum is one of desulfurized gypsum, phosphogypsum and natural gypsum, and the content of phosphorus and fluorine is less than or equal to 1 percent.
Further preferably, the air entraining agent is one of aluminum powder, sodium dodecyl sulfate, sodium fatty alcohol polyoxyethylene ether sulfate and rosin soap foaming agent, and the standard mesh number of the air entraining agent is less than or equal to 80 meshes; the foam stabilizer is one of natural gleditsia sinensis extract, polyacrylamide and cellulose ether.
Preferably, in the step (3), the mixing speed is 350-450 rpm, and the mixing time is 3-5 min.
Preferably, in the step (3), the resting treatment is resting at 45-55 ℃ for 1.5-2.5 hours.
Preferably, in the step (4), the carbon dioxide concentration of the carbon dioxide atmosphere is not less than 85%.
Preferably, in the step (4), the autoclaved curing temperature is 170-190 ℃, the pressure is 0.5-1.3 MPa, and the autoclaved curing time is 4-10 h.
In a second aspect of the invention, there is provided an apparatus for carbon sequestration of autoclaved aerated concrete products, comprising a solid waste slurry supply and recovery system, a wet solid carbon milling system, a gas circulation system, and a solid carbon slurry storage system;
the solid waste slurry supply and recovery system comprises a solid waste raw material supply system 1, a solid waste raw material recovery system 2, a feed inlet valve 3, a solid waste raw material feed inlet 4, an equipment cleaning discharge outlet 5 and an equipment cleaning discharge outlet valve 6;
the wet carbon-fixing grinding system comprises a grinding machine barrel 7, a stirring blade 8, a grinding machine motor 9, a wear-resistant barrel bottom 10, a smoke gas inlet valve 11, a smoke gas inlet 12, a cavity 13 and a discharge hole 14;
The solid waste raw material feed inlet 4 is arranged at the bottom end of the mill barrel 7 in a penetrating manner along the tangential direction, the inner cavity of the wet solid carbon grinding system is communicated with the solid waste raw material supply system 1 through the solid waste raw material feed inlet 4, and the solid waste raw material feed inlet 4 is provided with a feed inlet valve 3 for controlling the opening and closing states of the solid waste raw material feed inlet; the stirring blade 8 is arranged along the central axis direction of the mill barrel 7, the mill motor 9 is arranged at the top of the mill barrel 7, the rotating shaft of the stirring blade 8 penetrates through the top wall of the mill barrel 7 and is connected with the mill motor 9, and the stirring blade 8 is driven to rotate by the driving of the mill motor 9; the wear-resistant barrel bottom 10 is arranged at the bottom of the mill barrel 7, and the height of the contact part of the wear-resistant barrel bottom 10 and the inner wall of the mill barrel 7 is not higher than the height of the lower wall of the solid waste raw material feed inlet 4; the equipment cleaning discharge port 5 is communicated with the bottom end of the mill barrel 7 and is communicated with the solid waste raw material recovery system 2, and the equipment cleaning discharge port 5 is provided with an equipment cleaning discharge port valve 6 for controlling the opening and closing states of the equipment cleaning discharge port valve; the flue gas inlet 12 is arranged at the bottom end of the mill barrel 7 in a penetrating way along the tangential direction, the height of the upper wall of the flue gas inlet 12 is not higher than the height of the contact part of the wear-resistant barrel bottom 10 and the inner wall of the mill barrel 7, the flue gas inlet 12 is provided with a flue gas inlet valve 11 for controlling the opening and closing state of the flue gas inlet valve, a cavity 13 is formed by surrounding the lower part of the wear-resistant barrel bottom 10 and the bottom wall of the mill barrel 7, and a discharge port 14 is arranged at the upper end of the mill barrel 7 in a penetrating way along the tangential direction;
The gas circulation system comprises a gas-liquid separation transfer tank 15, a carbon dioxide concentration sensor 16, a recovered gas control valve 17, a gas circulation device 18, an external exhaust gas control valve 21 and a gas recovery tank 22;
The carbon-fixing slurry storage system comprises a carbonization slurry stirrer 19, a carbonization slurry storage tank 20, a discharge port 23 and a discharge port control valve 24;
The gas-liquid separation transfer tank 15 is communicated with the discharge port 14, the carbon dioxide concentration sensor 16 and the carbonized slurry storage tank 20, the carbon dioxide concentration sensor 16 is communicated with the gas circulation device 18 and the gas recovery tank 22, and the connecting channels of the carbon dioxide concentration sensor 16, the gas circulation device 18 and the gas recovery tank 22 are respectively provided with a recovered gas control valve 17 and an external exhaust gas control valve 21 for controlling the opening and closing states of the connecting channels; the carbonization slurry stirrer 19 is arranged in the inner cavity of the carbonization slurry storage tank 20, the discharge port 23 is communicated with the bottom of the carbonization slurry storage tank 20 along the tangential direction, and the discharge port 23 is provided with a discharge port control valve 24.
Preferably, the wear-resistant cylinder bottom 10 is of an arc-shaped structure made of wear-resistant alloy steel, and each square centimeter is provided with 1-5 round holes with the aperture of 0.5-3 mm.
Preferably, the rotational speed of the carbonized slurry agitator 19 is greater than or equal to 50rpm when in operation.
When the process is applied, key steps are realized through a carbon sealing device for autoclaved aerated concrete products, and the specific preparation process is as follows:
After the carbon dioxide gas source is pressurized by the gas circulation device 18, the flue gas inlet valve 11 is opened, so that the carbon dioxide gas source is input into the wet grinding device through the flue gas inlet 12; opening a feed port valve 3, and inputting solid waste slurry into a wet grinding device through a solid waste raw material feed port 4 by a solid waste raw material supply system 1; the stirring blade 8 is driven to rotate by the output power of the mill motor 9, so that a carbon dioxide gas source, solid waste slurry and grinding balls are mixed for wet grinding treatment, and when the wet grinding treatment is carried out, the valve 6 of the cleaning discharge hole is in a closed state, and the gas-liquid mixture is discharged through the discharge hole 14 after continuous production; after wet grinding treatment is completed, the feed port valve 3 is closed, the equipment cleaning discharge port valve 6 is opened, and materials in the cylinder are recycled to the solid waste raw material recycling system 2 through the equipment cleaning discharge port 5; the mixture of the carbonized solid waste slurry and the wet grinding residual gas output by the discharge port 14 is subjected to gas-liquid separation by the gas-liquid separation transfer tank 15, and the wet grinding residual gas enters the carbon dioxide concentration sensor 16, and the recovered gas control valve 17 and the external exhaust gas control valve 21 are in a closed state; detecting the carbon dioxide concentration of the wet grinding residual gas, if the result is higher than the set concentration, opening a recovered gas control valve 17, and conveying the recovered gas to a gas circulation device 18 to be used as a carbon dioxide gas source for recycling; if the result is not higher than the set concentration, opening the exhaust gas control valve 21, conveying the exhaust gas to the gas recovery tank 22, and recovering the exhaust gas through saturated lime water in the tank; the carbonization treatment solid waste slurry separated by the gas-liquid separation transfer tank 15 is input and sent to the carbonization slurry storage tank 20, at the moment, the discharge port control valve 24 is in a closed state, the carbonization treatment solid waste slurry is kept stirring under the rotation of the carbonization slurry stirrer 19, when discharging is needed, the discharge port control valve 24 is opened, the carbonization treatment solid waste slurry is output by the discharge port 23, and the mixture slurry is poured according to the proportion and uniformly stirred with solid waste, cement, gypsum, lime, air entraining agent and foam stabilizer, and then the aerated concrete blank is obtained through resting treatment; turning over the aerated concrete blank, cutting according to the specification requirements of different products, and transferring into an autoclave; providing corresponding treatment conditions for the autoclaved concrete by a hot gas furnace, and conveying high-concentration carbon dioxide gas provided by a gas circulation system into an autoclave, wherein an aerated concrete blank in the autoclave is autoclaved and cured in a carbon dioxide atmosphere to obtain an autoclaved aerated concrete product; recovering the autoclaved residual gas and the tail gas of the hot gas furnace, and conveying the tail gas to a gas circulation system to be used as a carbon dioxide gas source for recycling; and taking out the autoclaved aerated concrete product from the kettle to obtain a finished product.
In combination with the above, the inventive concept of the process and the equipment of the invention is as follows:
Firstly, the effective carbon-fixing component in the solid waste is alkaline earth metal ions, and the efficiency of carbon fixing depends on Ca 2+、Mg2+ plasma dissolution in the solid particles. The enriched CO 2 dissolves in aqueous solution to form CO 3 2- and precipitates crystals on the particle surface to form a precipitate. Because the solid waste silicon-aluminum-oxygen network structure has higher thermodynamic stability, the Ca 2+、Mg2+ plasma inside is difficult to dissolve continuously, and the generated calcium carbonate calcium precipitate and the silicon aluminum colloid completely wrap the solid waste particles, so that the dissolution and diffusion of ions are blocked, and the carbon fixing efficiency is limited. Therefore, the invention concentrates on adopting the method for carbon fixation in the liquid phase grinding environment. On one hand, the gas movement is optimized by regulating and controlling the concentration and pressure of the gas, so that the collision between solid waste particles and grinding balls and the collision between the solid waste particles and the solid waste particles are aggravated, the effect of reducing the surface energy of the particles under the chemical corrosion environment of a liquid phase medium is realized, the high-efficiency refinement under the gas-liquid-solid three-phase synergistic effect is realized, and the grinding efficiency is improved; on the other hand, the high-efficiency depolymerization of the solid waste particles provides more effective carbon-fixing ions for the solution, promotes the alkalinity of the solution, further accelerates the dissolution and precipitation reaction of CO 2 in the aqueous solution, and simultaneously, due to the action of mechanical force, the produced calcium carbonate precipitates and the silica-alumina colloid migrate into the solution, further relieves the problem of particle wrapping, thereby realizing the purpose of high-efficiency carbon dioxide solidification and obviously improving the solid waste grinding efficiency and the carbon-fixing efficiency.
Secondly, through carbon mineralization modification, more solid waste raw materials can be used for producing aerated concrete. The main materials of the prior aerated concrete are fly ash or sand, auxiliary materials such as cement, gypsum and the like and additives. With the development of fly ash utilization technology and the implementation of multi-region river sand forbidden mining, raw materials with higher cost performance are difficult to obtain in some regions, however, other solid wastes are in stable mineral phases due to silicon and aluminum, and the production of aerated concrete is difficult to realize by utilizing other solid wastes. The scheme of the invention provides a technical idea of carbon mineralization, gel and crystal phase of C- (A) S-H can be effectively depolymerized through optimizing and controlling reaction parameters, so that the dissolution of active silicon and aluminum components in solid waste is promoted, and the preparation and production of aerated concrete materials can be satisfied by solid waste raw materials of steel slag, construction waste micro powder, fly ash, high-calcium fly ash, red mud, slag, magnesium slag, phosphorus slag and aerated block waste.
Subsequently, the current capture and concentration of carbon dioxide is subject to large economic cost and energy consumption, and is a typical indirect production industry especially for aerated concrete, and the concentration of carbon dioxide in flue gas is low and collection is difficult. Based on the thought, the invention provides corresponding process and key equipment, and the discharged flue gas can be directly used for pretreatment of the front-section raw material through the pipeline, so that the method has good adaptability to low-carbon-dioxide-concentration flue gas, solves the problem that the flue gas is difficult to utilize in aerated concrete production, realizes modification of the raw material, and has double effects.
Finally, carbon dioxide sealing is one of means for effectively treating carbon dioxide, and the method is an effective method for absorbing the flue gas of the industrial park or capturing the dioxygen gas, and the flue gas with different carbon dioxide concentrations is respectively utilized in the pretreatment and autoclaved curing stages of raw materials, and a recycling method is established, so that the treatment of the flue gas rich in carbon dioxide of the nearby industrial park is promoted.
Compared with the prior art, the invention has the following advantages and beneficial effects:
The invention provides a carbon sealing method for autoclaved aerated concrete products, which realizes high-efficiency carbon fixation of solid wastes through improvement of wet grinding process parameter conditions, is used for preparing autoclaved aerated concrete products, and can not only consume industrial flue gas and trapped carbon dioxide gas in the production process of autoclaved aerated concrete products and chemical industry parks, but also ensure the performance of autoclaved aerated concrete products and has remarkable carbon reduction benefit.
The invention provides a device for carbon sequestration of autoclaved aerated concrete products, which relieves the problem of particle wrapping, thereby realizing efficient carbon dioxide solidification, remarkably improving the solid waste grinding efficiency and the carbon fixing efficiency, and realizing the recycling of partial raw materials.
Drawings
FIG. 1 is a production process flow diagram of a carbon sequestration process for autoclaved aerated concrete articles;
FIG. 2 is a schematic structural view of a carbon sequestration apparatus for autoclaved aerated concrete articles;
In the figure: 1. a solid waste raw material supply system; 2. a solid waste raw material recovery system; 3. a feed inlet valve; 4. a solid waste raw material feed inlet; 5. cleaning a discharge hole by equipment; 6. cleaning a discharge port valve by equipment; 7. grinding a machine barrel; 8. stirring blades; 9. a mill motor; 10. wear-resistant cylinder bottom; 11. a flue gas inlet valve; 12. a flue gas inlet; 13. a cavity; 14. a discharge port; 15. a gas-liquid separation transfer tank; 16. a carbon dioxide concentration sensor; 17. a recycle gas control valve; 18. a gas circulation device; 19. a carbonized slurry stirrer; 20. a carbonized slurry storage tank; 21. an outer exhaust body control valve; 22. a gas recovery tank; 23. a discharge port; 24. and a discharge port valve.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention. The experimental methods, in which specific conditions are not noted in the following examples, were selected according to conventional methods and conditions, or according to the commercial specifications.
The sources of raw materials used in the following examples are as follows: the industrial flue gas is derived from the industrial flue gas obtained by preliminary purification of the coal-fired furnace; the steel slag is derived from steel plant discharged steelmaking slag; the construction waste micro powder is derived from micro powder screened out by a construction waste recycling station; the fly ash is derived from a power plant; the high-calcium fly ash is derived from fly ash obtained by combusting lignite; the red mud is derived from smelting aluminum discharge waste; slag is derived from waste slag discharged from iron making in iron and steel plants; the magnesium slag is derived from smelting magnesium discharge waste slag; the phosphorus slag is derived from yellow phosphorus discharged waste residue from phosphorite smelting; the aerated block waste material is derived from waste and defective products in the aerated concrete production process; the nickel slag is derived from the waste residue discharged from smelting the ferronickel alloy; the copper slag is derived from waste slag discharged from smelting copper;
The main performance test methods and calculations of the materials in the following examples are as follows: the test method of absolute dry volume weight and average compressive strength is implemented by referring to standard GB/T11969-2020; the carbon fixation rate calculation method is the weight ratio of CO 2 -eq absorbed in the aerated concrete to all solid raw materials in the aerated concrete.
Example 1
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with carbon dioxide concentration of 5% and sulfur dioxide concentration of 2% and other components meeting the requirements of GB 13223-2011 to 0.35MPa through a gas circulation system to obtain pressurized gas; fly ash with a median particle size of 45 μm and 48wt.% total of calcium oxide and silicon oxide was mixed with water according to a mass ratio of 1:0.8, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 50L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:2 preparing, carrying out wet grinding treatment at the speed of 400rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; 110 parts of 42.5 silicate cement, 50 parts of quicklime with the calcium oxide content of 85 percent and 20 parts of phosphogypsum with the phosphorus and fluorine content of 1 percent are respectively conveyed into a stirrer by a belt conveyor by an auxiliary material system; the additive system uniformly mixes 5 parts of aluminum powder passing through a 80-mesh square hole sieve and 0.8 part of natural gleditsia sinensis lam and then conveys the mixture to a stirrer; stirring the raw materials for 3min at a rotating speed of 350rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out static treatment for 1.5 hours at the temperature of 55 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 85% into an autoclave, controlling the temperature and the pressure in the autoclave to be 170 ℃ and 1.3MPa respectively through a steam header, autoclaved curing for 10h, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 50rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight is 742kg/m 3, the average compressive strength is 5.2MPa, and the volume weight and the strength grade of B07A5.0 in GB/T11968-2020 standard are satisfied. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 6.3%, and the product has a good carbon fixation effect.
Example 2
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The industrial flue gas with the carbon dioxide concentration of 8 percent and the sulfur dioxide concentration of 1.7 percent and other components meeting the requirements of GB 13223-2011 is pressurized to 0.35MPa by a gas circulation system to obtain pressurized gas; aerated cake waste with a median particle size of 300 μm and a total of 78wt.% of calcium oxide and silicon oxide and fly ash with a median particle size of 45 μm and a total of 48wt.% of calcium oxide and silicon oxide were mixed in a mass ratio of 1:1, mixing the obtained mixture with water according to a mass ratio of 1:1, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 70L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:1, preparing, carrying out wet grinding treatment at a speed of 400rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) 240 parts of carbonized solid waste slurry and 240 parts of fly ash which is not carbonized are conveyed to a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with the calcium oxide content of 85 percent and 20 parts of phosphogypsum with the phosphorus and fluorine content of 1 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 5 parts of aluminum powder passing through a 80-mesh square hole sieve and 0.8 part of natural gleditsia sinensis lam and then conveys the mixture to a stirrer; stirring the raw materials for 5min at a rotating speed of 350rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out static treatment for 2.5 hours at the temperature of 45 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 50rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 732kg/m 3, the average compressive strength is 5.3MPa, and the volume weight and the strength grade of B07A5.0 in GB/T11968-2020 standard are met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 9.2%, and the product has a good carbon fixation effect.
Example 3
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 16% and the sulfur dioxide concentration of 1.5% and other components meeting the GB 13223-2011 requirements to 0.31MPa through a gas circulation system to obtain pressurized gas; the high-calcium fly ash with the median particle size of 32 mu m and the total amount of calcium oxide and silicon oxide of 75wt.% is mixed with water according to the mass ratio of 1:1.5, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 50L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:1, preparing, carrying out wet grinding treatment at a speed of 400rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 90 parts of 42.5 silicate cement, 75 parts of quicklime with the calcium oxide content of 85 percent and 15 parts of phosphogypsum with the phosphorus and fluorine content of 1 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 5 parts of rosin soap foaming agent passing through a 80-mesh square hole sieve and 0.8 part of natural gleditsia sinensis lam, and then conveys the mixture into a stirrer; stirring the raw materials for 5min at a rotating speed of 350rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out static treatment for 2.5 hours at the temperature of 45 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 50rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight is 731kg/m 3, the average compressive strength is 5.1MPa, and the volume weight and the strength grade of B07A5.0 in GB/T11968-2020 standard are satisfied. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 14.2%, and the product has a good carbon fixation effect.
Example 4
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with carbon dioxide concentration of 22% and sulfur dioxide concentration of 1.5% and other components meeting the GB 13223-2011 requirements to 0.29MPa through a gas circulation system to obtain pressurized gas; fly ash with a median particle size of 45 μm and a total amount of calcium oxide and silicon oxide of 48wt.% and red mud with a median particle size of 56 μm and a total amount of calcium oxide and silicon oxide of 25wt.% are mixed in a mass ratio of 1:1, mixing the obtained mixture with water according to a mass ratio of 1:1, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 60L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.4, preparing, carrying out wet grinding treatment at the speed of 400rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; 110 parts of 42.5 silicate cement, 50 parts of quicklime with calcium oxide content of 90% and 20 parts of phosphogypsum with phosphorus and fluorine content of 0.5% are respectively conveyed into a stirrer by a belt conveyor by an auxiliary material system; the additive system uniformly mixes 5 parts of aluminum powder passing through a 80-mesh square hole sieve and 1 part of natural saporin and then conveys the mixture to a stirrer; stirring the raw materials for 5min at a rotating speed of 350rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out static treatment for 2.5 hours at the temperature of 45 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 50rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight is 589kg/m 3, the average compressive strength is 4.5MPa, and the volume weight and the strength grade of B06A3.5 in GB/T11968-2020 standard are satisfied. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 13.5%, and the product has a good carbon fixation effect.
Example 5
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The industrial flue gas with the carbon dioxide concentration of 30 percent and the sulfur dioxide concentration of 0.5 percent and other components meeting the GB 13223-2011 requirement is pressurized to 0.29MPa by a gas circulation system to obtain pressurized gas; steel slag with a median particle size of 70 mu m and a total amount of calcium oxide and silicon oxide of 69wt.% and high-calcium fly ash with a median particle size of 32 mu m and a total amount of calcium oxide and silicon oxide of 75wt.% are mixed according to a mass ratio of 2:3, mixing the obtained mixture with water according to a mass ratio of 1:1.1, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 60L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.4, preparing, carrying out wet grinding treatment at the speed of 400rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of phosphogypsum with phosphorus and fluorine content of 0.5 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 8 parts of aluminum powder passing through a 80-mesh square hole sieve and 1 part of natural saporin and then conveys the mixture to a stirrer; stirring the raw materials for 4min at a rotating speed of 350rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 50rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 590kg/m 3, the average compressive strength of the autoclaved aerated concrete block is 4.2MPa, and the volume weight and the strength grade of B06A3.5 in GB/T11968-2020 standard are met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 23.0%, and the product has a good carbon fixation effect.
Example 6
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 16% and the sulfur dioxide concentration of 1.5% and other components meeting the GB 13223-2011 requirements to 0.31MPa through a gas circulation system to obtain pressurized gas; magnesium slag with a median particle size of 62 μm and a total amount of calcium oxide and silicon oxide of 67wt.% and fly ash with a median particle size of 45 μm and a total amount of calcium oxide and silicon oxide of 48wt.% are mixed in a mass ratio of 2:3, mixing the obtained mixture with water according to a mass ratio of 1:1.1, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 60L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.4, preparing, carrying out wet grinding treatment at the speed of 400rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of phosphogypsum with phosphorus and fluorine content of 0.5 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 8 parts of aluminum powder passing through a 80-mesh square hole sieve and 1 part of natural saporin and then conveys the mixture to a stirrer; stirring the raw materials for 5min at a rotating speed of 350rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 50rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight is 605kg/m 3, the average compressive strength is 4.6MPa, and the volume weight and the strength grade of B06A3.5 in GB/T11968-2020 standard are satisfied. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 16.3%, and the product has a good carbon fixation effect.
Example 7
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 16% and the sulfur dioxide concentration of 1.5% and other components meeting the GB 13223-2011 requirements to 0.31MPa through a gas circulation system to obtain pressurized gas; building waste micropowder having a median particle diameter of 205 μm and a total of 79wt.% of calcium oxide and silicon oxide and slag having a median particle diameter of 75 μm and a total of 72wt.% of calcium oxide and silicon oxide were mixed in a mass ratio of 3:2, mixing the obtained mixture with water according to a mass ratio of 1:1.1, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 60L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.4, preparing, carrying out wet grinding treatment at the speed of 400rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of phosphogypsum with phosphorus and fluorine content of 0.5 percent into a stirrer through a belt conveyor; the additive system is used for uniformly mixing 8 parts of sodium dodecyl sulfate passing through a 80-mesh square-hole sieve and 1 part of natural gleditsia sinensis lam and then conveying the mixture into a stirrer; stirring the raw materials for 5min at a rotating speed of 350rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 50rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 621kg/m 3, the average compressive strength of the autoclaved aerated concrete block is 4.5MPa, and the volume weight and the strength grade of B06A3.5 in GB/T11968-2020 standard are met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 14.2%, and the product has a good carbon fixation effect.
Example 8
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 16% and the sulfur dioxide concentration of 1.5% and other components meeting the GB 13223-2011 requirements to 0.31MPa through a gas circulation system to obtain pressurized gas; building waste micropowder with a median particle diameter of 205 μm and a total of 79wt.% of calcium oxide and silicon oxide and phosphorous slag with a median particle diameter of 146 μm and a total of 71wt.% of calcium oxide and silicon oxide were mixed in a mass ratio of 3:2, mixing the obtained mixture with water according to a mass ratio of 1:1.1, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 60L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.4, preparing, carrying out wet grinding treatment at the speed of 400rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of phosphogypsum with phosphorus and fluorine content of 0.5 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 8 parts of fatty alcohol polyoxyethylene ether sodium sulfate passing through a 80-mesh square hole sieve and 1 part of polyacrylamide, and then conveys the mixture into a stirrer; stirring the raw materials for 5min at a rotating speed of 350rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 190 ℃ and 0.5MPa respectively through a steam header, autoclaved curing for 10 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 50rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 631kg/m 3, the average compressive strength of the autoclaved aerated concrete block is 3.9MPa, and the volume weight and the strength grade of B06A3.5 in GB/T11968-2020 standard are met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 13.8%, and the product has a good carbon fixation effect.
Example 9
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 16% and the sulfur dioxide concentration of 1.5% and other components meeting the GB 13223-2011 requirements to 0.31MPa through a gas circulation system to obtain pressurized gas; nickel slag having a median particle diameter of 95 μm and a total of 58wt.% of calcium oxide and silicon oxide and copper slag having a median particle diameter of 175 μm and a total of 71wt.% of calcium oxide and silicon oxide were mixed in a mass ratio of 1:1, mixing the obtained mixture with water according to a mass ratio of 1:1.1, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 60L/min, preparing zirconia grinding balls with the diameter of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.4, preparing, carrying out wet grinding treatment at the speed of 500rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of phosphogypsum with phosphorus and fluorine content of 0.5 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 8 parts of aluminum powder passing through a 80-mesh square hole sieve and 1 part of polyacrylamide and then conveys the mixture to a stirrer; stirring the raw materials for 5min at a rotation speed of 400rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 50rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 648kg/m 3, the average compressive strength is 4.0MPa, and the volume weight and the strength grade of B06A3.5 in GB/T11968-2020 standard are met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 9.5%, and the product has a good carbon fixation effect.
Example 10
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 16% and the sulfur dioxide concentration of 1.5% and other components meeting the GB 13223-2011 requirements to 0.31MPa through a gas circulation system to obtain pressurized gas; nickel slag with a median particle diameter of 95 μm and a total of 58wt.% of calcium oxide and silicon oxide is mixed with water according to a mass ratio of 1:1.1, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 60L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.4, preparing, carrying out wet grinding treatment at the speed of 500rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of phosphogypsum with phosphorus and fluorine content of 0.5 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 8 parts of aluminum powder passing through a 80-mesh square hole sieve and 1 part of polyacrylamide and then conveys the mixture to a stirrer; stirring the raw materials for 5min at a rotation speed of 400rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 50rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 634kg/m 3, the average compressive strength of the autoclaved aerated concrete block is 3.5MPa, and the volume weight and the strength grade of B06A3.5 in GB/T11968-2020 standard are met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 9.3%, and the product has a good carbon fixation effect.
Example 11
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 16% and the sulfur dioxide concentration of 1.5% and other components meeting the GB 13223-2011 requirements to 0.31MPa through a gas circulation system to obtain pressurized gas; copper slag with a median particle size of 75 μm and a total of 63wt.% of calcium oxide and silicon oxide was mixed with water according to a mass ratio of 1:1.3, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 60L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.4, preparing, carrying out wet grinding treatment at the speed of 500rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of desulfurized gypsum with phosphorus and fluorine content of 0.43 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 8 parts of aluminum powder passing through a 80-mesh square hole sieve and 1 part of polyacrylamide and then conveys the mixture to a stirrer; stirring the raw materials for 5min at a rotation speed of 400rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 50rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 638kg/m 3, the average compressive strength of the autoclaved aerated concrete block is 4.3MPa, and the volume weight and the strength grade of B06A3.5 in GB/T11968-2020 standard are met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 10.2%, and the product has a good carbon fixation effect.
Example 12
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 16% and the sulfur dioxide concentration of 1.5% and other components meeting the GB 13223-2011 requirements to 0.31MPa through a gas circulation system to obtain pressurized gas; slag having a median particle diameter of 75 μm and a total amount of calcium oxide and silicon oxide of 72wt.% and high-calcium fly ash having a median particle diameter of 32 μm and a total amount of calcium oxide and silicon oxide of 75wt.% were mixed in a mass ratio of 1:4, mixing the obtained mixture with water according to a mass ratio of 1:1.3, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 60L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.4, preparing, carrying out wet grinding treatment at the speed of 500rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of desulfurized gypsum with phosphorus and fluorine content of 0.43 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 8 parts of aluminum powder passing through a 80-mesh square hole sieve and 1 part of polyacrylamide and then conveys the mixture to a stirrer; stirring the raw materials for 5min at a rotation speed of 400rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 50rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 637kg/m 3, the average compressive strength of the autoclaved aerated concrete block is 4.1MPa, and the volume weight and the strength grade of B06A3.5 in GB/T11968-2020 standard are met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 19.2%, and the product has a good carbon fixation effect.
Example 13
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 16% and the sulfur dioxide concentration of 1.5% and other components meeting the GB 13223-2011 requirements to 0.31MPa through a gas circulation system to obtain pressurized gas; magnesium slag with a median particle size of 62 μm and a total amount of calcium oxide and silicon oxide of 67wt.% and high-calcium fly ash with a median particle size of 32 μm and a total amount of calcium oxide and silicon oxide of 75wt.% are mixed in a mass ratio of 1:4, mixing the obtained mixture with water according to a mass ratio of 1:1.3, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 60L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.4, preparing, carrying out wet grinding treatment at the speed of 500rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of desulfurized gypsum with phosphorus and fluorine content of 0.43 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 8 parts of aluminum powder passing through a 80-mesh square hole sieve and 1 part of polyacrylamide and then conveys the mixture to a stirrer; stirring the raw materials for 5min at a rotation speed of 400rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 80rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 631kg/m 3, the average compressive strength is 4.2MPa, and the A3.5 strength grade in the GB/T15762-2020 standard is met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 19.2%, and the product has a good carbon fixation effect.
Example 14
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 16% and the sulfur dioxide concentration of 1.5% and other components meeting the GB 13223-2011 requirements to 0.31MPa through a gas circulation system to obtain pressurized gas; steel slag with a median particle size of 70 mu m and 69wt.% of total calcium oxide and silicon oxide is mixed with water according to a mass ratio of 1:1.3, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 60L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.4, preparing, carrying out wet grinding treatment at the speed of 500rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of desulfurized gypsum with phosphorus and fluorine content of 0.43 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 8 parts of aluminum powder passing through a 80-mesh square hole sieve and 1 part of polyacrylamide and then conveys the mixture to a stirrer; stirring the raw materials for 5min at a rotation speed of 400rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 85% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 100rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 599kg/m 3, the average compressive strength is 3.8MPa, and the A3.5 strength grade in GB/T15762-2020 standard is met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 24.8%, and the product has a good carbon fixation effect.
Example 15
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with carbon dioxide concentration of 40% and sulfur dioxide concentration of 0.1% and other components meeting the GB 13223-2011 requirement to 0.28MPa through a gas circulation system to obtain pressurized gas; mixing the construction waste micropowder with the median particle diameter of 205 mu m and the total amount of calcium oxide and silicon oxide of 79wt.% with water according to the mass ratio of 1:1.5, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 60L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.4, preparing, carrying out wet grinding treatment at the speed of 500rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of desulfurized gypsum with phosphorus and fluorine content of 0.43 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 8 parts of aluminum powder passing through a 80-mesh square hole sieve and 1 part of cellulose ether and then conveys the mixture to a stirrer; stirring the raw materials for 5min at a rotation speed of 400rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 100rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 588kg/m 3, the average compressive strength of the autoclaved aerated concrete block is 3.7MPa, and the strength grade A3.5 in the GB/T15762-2020 standard is met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 21.9%, and the product has a good carbon fixation effect.
Example 16
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The industrial flue gas with the carbon dioxide concentration of 65 percent and the sulfur dioxide concentration of 0.1 percent and other components meeting the requirements of GB 13223-2011 is pressurized to 0.25MPa by a gas circulation system to obtain pressurized gas; fly ash with a median particle size of 45 μm and 48wt.% total of calcium oxide and silicon oxide was mixed with water according to a mass ratio of 1:1.5, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 30L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.2, preparing, carrying out wet grinding treatment at the speed of 200rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 48 parts of carbonized solid waste slurry and 432 parts of fly ash which is not carbonized into a stirrer; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of desulfurized gypsum with phosphorus and fluorine content of 0.43 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 8 parts of aluminum powder passing through a 80-mesh square hole sieve and 1 part of cellulose ether and then conveys the mixture to a stirrer; stirring the raw materials for 5min at a rotation speed of 400rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 100rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight is 586kg/m 3, the average compressive strength is 4.5MPa, and the A3.5 strength grade in GB/T15762-2020 standard is met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 6.7%, and the product has a good carbon fixation effect.
Example 17
Carbon sequestration methods for autoclaved aerated concrete products:
(1) Industrial flue gas with the carbon dioxide concentration of 79 percent and the sulfur dioxide concentration of 0.1 percent and other components meeting the requirements of GB 13223-2011 is pressurized to 0.2MPa by a gas circulation system to obtain pressurized gas; the high-calcium fly ash with the median particle size of 32 mu m and the total amount of calcium oxide and silicon oxide of 75wt.% is mixed with water according to the mass ratio of 1:1.3, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 30L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.2, preparing, carrying out wet grinding treatment at a speed of 800rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of desulfurized gypsum with phosphorus and fluorine content of 0.43 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 8 parts of aluminum powder passing through a 80-mesh square hole sieve and 1 part of cellulose ether and then conveys the mixture to a stirrer; stirring the raw materials at a rotation speed of 450rpm for 5min to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 100rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 593kg/m 3, the average compressive strength is 5.3MPa, and the A5.0 strength grade in the GB/T15762-2020 standard is met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 15.1%, and the product has a good carbon fixation effect.
Example 18
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 99% and the sulfur dioxide concentration of 0% and other components meeting the GB 13223-2011 requirements to 0.2MPa through a gas circulation system to obtain pressurized gas; the high-calcium fly ash with the median particle size of 56 mu m and the total amount of calcium oxide and silicon oxide of 25wt.% is mixed with water according to the mass ratio of 1:2, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 30L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.2, preparing, carrying out wet grinding treatment at a speed of 800rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 silicate cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of desulfurized gypsum with phosphorus and fluorine content of 0.43 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 8 parts of aluminum powder passing through a 80-mesh square hole sieve and 1 part of cellulose ether and then conveys the mixture to a stirrer; stirring the raw materials at a rotation speed of 450rpm for 5min to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 100rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 642kg/m 3, the average compressive strength is 3.6MPa, and the strength grade A3.5 in the GB/T15762-2020 standard is met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 23.5%, and the product has a good carbon fixation effect.
Example 19
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 99% and the sulfur dioxide concentration of 0% and other components meeting the GB 13223-2011 requirements to 0.2MPa through a gas circulation system to obtain pressurized gas; slag having a median particle diameter of 75 μm and a total of calcium oxide and silicon oxide of 72wt.% was mixed with water in a mass ratio of 1:1.3, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 30L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.2, preparing, carrying out wet grinding treatment at a speed of 800rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; 120 parts of 42.5 ordinary Portland cement, 85 parts of quicklime with calcium oxide content of 90 percent and 25 parts of desulfurized gypsum with phosphorus and fluorine content of 0.43 percent are respectively conveyed into a stirrer by a belt conveyor by an auxiliary material system; the additive system uniformly mixes 10 parts of aluminum powder passing through a 80-mesh square hole sieve and 1.3 parts of cellulose ether and then conveys the mixture to a stirrer; stirring the raw materials at a rotation speed of 450rpm for 5min to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 2 round holes with the aperture of 1mm per square centimeter; the rotational speed of the carbonized slurry agitator was 100rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight is 586kg/m 3, the average compressive strength is 4.8MPa, and the A3.5 strength grade in GB/T15762-2020 standard is met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 10.5%, and the product has a good carbon fixation effect.
Example 20
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 99% and the sulfur dioxide concentration of 0% and other components meeting the GB 13223-2011 requirements to 0.2MPa through a gas circulation system to obtain pressurized gas; magnesium slag with a median particle size of 62 mu m and 67wt.% of the total amount of calcium oxide and silicon oxide is mixed with water according to a mass ratio of 1:1.3, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 30L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.2, preparing, carrying out wet grinding treatment at a speed of 800rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 ordinary Portland cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of desulfurized gypsum with phosphorus and fluorine content of 0.43 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 10 parts of aluminum powder passing through a 80-mesh square hole sieve and 1.3 parts of cellulose ether and then conveys the mixture to a stirrer; stirring the raw materials at a rotation speed of 450rpm for 5min to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out resting treatment for 2 hours at 50 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 1 round hole with the aperture of 0.3mm per square centimeter; the rotational speed of the carbonized slurry agitator was 100rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight is 492kg/m 3, the average compressive strength is 3.9MPa, and the strength grade A3.5 in the GB/T15762-2020 standard is satisfied. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 23.5%, and the product has a good carbon fixation effect.
Example 21
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 99% and the sulfur dioxide concentration of 0% and other components meeting the GB 13223-2011 requirements to 0.2MPa through a gas circulation system to obtain pressurized gas; magnesium slag with a median particle diameter of 146 μm and a total of 71wt.% of calcium oxide and silicon oxide is mixed with water according to a mass ratio of 1:1.3, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 30L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.2, preparing, carrying out wet grinding treatment at a speed of 800rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 ordinary Portland cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of desulfurized gypsum with phosphorus and fluorine content of 0.43 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 10 parts of aluminum powder passing through a 80-mesh square hole sieve and 1.3 parts of cellulose ether and then conveys the mixture to a stirrer; stirring the raw materials for 3min at the rotating speed of 450rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out static treatment for 1.5 hours at the temperature of 55 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 180 ℃ and 0.7MPa respectively through a steam header, performing autoclaved curing for 8 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, the wear-resistant cylinder bottom of the carbon sealing equipment for autoclaved aerated concrete products is provided with 1 round hole with the aperture of 0.3mm per square centimeter; the rotational speed of the carbonized slurry agitator was 100rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 521kg/m 3, the average compressive strength is 4.6MPa, and the strength grade A3.5 in the GB/T15762-2020 standard is met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 9.9%, and the product has a good carbon fixation effect.
Example 22
Carbon sequestration methods for autoclaved aerated concrete products:
(1) The method comprises the steps of pressurizing industrial flue gas with the carbon dioxide concentration of 99% and the sulfur dioxide concentration of 0% and other components meeting the GB 13223-2011 requirements to 0.2MPa through a gas circulation system to obtain pressurized gas; aerated block waste with a median particle size of 300 μm and a total of 78wt.% calcium oxide and silicon oxide was mixed with water in a mass ratio of 1:1.3, uniformly stirring to obtain solid waste slurry;
(2) Conveying pressurized gas and solid waste slurry into wet grinding equipment through a material pipeline, wherein the conveying rate of the solid waste slurry is 30L/min, preparing alumina grinding balls with diameters of 0.4-5.0 mm, and the grinding balls and the solid waste slurry are in a ball-to-material ratio of 1:0.2, preparing, carrying out wet grinding treatment at a speed of 800rpm, and enabling the slurry after continuous grinding to enter a slurry storage tank through a discharge port to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, and for the wet grinding residual gas with the carbon dioxide concentration not lower than 5%, entering a circulating system through a recovery valve to be used as a carbon dioxide gas source for recycling, and for the wet grinding residual gas with the carbon dioxide concentration lower than 5%, discharging the wet grinding residual gas into a gas recovery tank through an exhaust valve to be recovered;
(3) Conveying 480 parts of carbonized solid waste slurry into a stirrer in parts by weight; the auxiliary material system respectively conveys 100 parts of 42.5 ordinary Portland cement, 75 parts of quicklime with calcium oxide content of 90 percent and 20 parts of natural gypsum with phosphorus and fluorine content of 0.1 percent into a stirrer through a belt conveyor; the additive system uniformly mixes 10 parts of aluminum powder passing through a 80-mesh square hole sieve and 1.3 parts of cellulose ether and then conveys the mixture to a stirrer; stirring the raw materials for 3min at the rotating speed of 450rpm to obtain mixed slurry; pouring the mixed slurry into a mould vehicle, and carrying out static treatment for 1.5 hours at the temperature of 55 ℃ to obtain an aerated concrete blank;
(4) Turning over the aerated concrete blank, cutting according to the specification requirement of the air adding block, and transferring into an autoclave; and (3) introducing gas with the carbon dioxide concentration of 90% into an autoclave, controlling the temperature and the pressure in the autoclave to be 190 ℃ and 1.3MPa respectively through a steam header, performing autoclaved curing for 4 hours, and recycling residual gas in the autoclave to a gas circulation system to obtain autoclaved aerated concrete blocks.
In the process of the embodiment, 5 round holes with the aperture of 0.5mm are arranged at the bottom of a wear-resistant cylinder of carbon sealing equipment for autoclaved aerated concrete products per square centimeter; the rotational speed of the carbonized slurry agitator was 100rpm in operation.
The autoclaved aerated concrete block is sampled and tested, and the absolute dry volume weight of the autoclaved aerated concrete block is 489kg/m 3, the average compressive strength is 4.3MPa, and the strength grade A3.5 in the GB/T15762-2020 standard is met. Through comprehensive measurement and analysis, the carbon fixation rate of the product reaches 17.6%, and the product has a good carbon fixation effect.
Example 23
The carbon sealing equipment for autoclaved aerated concrete products comprises a solid waste slurry supply and recovery system, a wet solid carbon grinding system, a gas circulation system and a solid carbon slurry storage system; the solid waste slurry supply and recovery system comprises a solid waste raw material supply system 1, a solid waste raw material recovery system 2, a feed inlet valve 3, a solid waste raw material feed inlet 4, an equipment cleaning discharge outlet 5 and an equipment cleaning discharge outlet valve 6; the wet carbon-fixing grinding system comprises a grinding machine barrel 7, a stirring blade 8, a grinding machine motor 9, a wear-resistant barrel bottom 10, a smoke gas inlet valve 11, a smoke gas inlet 12, a cavity 13 and a discharge hole 14; the solid waste raw material feed inlet 4 is arranged at the bottom end of the mill barrel 7 in a penetrating manner along the tangential direction, the inner cavity of the wet solid carbon grinding system is communicated with the solid waste raw material supply system 1 through the solid waste raw material feed inlet 4, and the solid waste raw material feed inlet 4 is provided with a feed inlet valve 3 for controlling the opening and closing states of the solid waste raw material feed inlet; the stirring blade 8 is arranged along the central axis direction of the mill barrel 7, the mill motor 9 is arranged at the top of the mill barrel 7, the rotating shaft of the stirring blade 8 penetrates through the top wall of the mill barrel 7 and is connected with the mill motor 9, and the stirring blade 8 is driven to rotate by the driving of the mill motor 9; the wear-resistant barrel bottom 10 is of an arc-shaped structure made of wear-resistant alloy steel, and is arranged at the bottom of the mill barrel 7, and the height of the contact part of the wear-resistant barrel bottom 10 and the inner wall of the mill barrel 7 is not higher than the height of the lower wall of the solid waste raw material feed inlet 4; the equipment cleaning discharge port 5 is communicated with the bottom end of the mill barrel 7 and is communicated with the solid waste raw material recovery system 2, and the equipment cleaning discharge port 5 is provided with an equipment cleaning discharge port valve 6 for controlling the opening and closing states of the equipment cleaning discharge port valve; the flue gas inlet 12 is arranged at the bottom end of the mill barrel 7 in a penetrating way along the tangential direction, the height of the upper wall of the flue gas inlet 12 is not higher than the height of the contact part of the wear-resistant barrel bottom 10 and the inner wall of the mill barrel 7, the flue gas inlet 12 is provided with a flue gas inlet valve 11 for controlling the opening and closing state of the flue gas inlet valve, a cavity 13 is formed by surrounding the lower part of the wear-resistant barrel bottom 10 and the bottom wall of the mill barrel 7, and a discharge port 14 is arranged at the upper end of the mill barrel 7 in a penetrating way along the tangential direction; the gas circulation system comprises a gas-liquid separation transfer tank 15, a carbon dioxide concentration sensor 16, a recovered gas control valve 17, a gas circulation device 18, an external exhaust gas control valve 21 and a gas recovery tank 22; the carbon-fixing slurry storage system comprises a carbonization slurry stirrer 19, a carbonization slurry storage tank 20, a discharge port 23 and a discharge port control valve 24; the gas-liquid separation transfer tank 15 is communicated with the discharge port 14, the carbon dioxide concentration sensor 16 and the carbonized slurry storage tank 20, the carbon dioxide concentration sensor 16 is communicated with the gas circulation device 18 and the gas recovery tank 22, and the connecting channels of the carbon dioxide concentration sensor 16, the gas circulation device 18 and the gas recovery tank 22 are respectively provided with a recovered gas control valve 17 and an external exhaust gas control valve 21 for controlling the opening and closing states of the connecting channels; the carbonization slurry stirrer 19 is arranged in the inner cavity of the carbonization slurry storage tank 20, the discharge port 23 is arranged at the bottom of the carbonization slurry storage tank 20 in a penetrating way along the tangential direction, and the discharge port 23 is provided with a discharge port control valve 24;
When in use, after the carbon dioxide gas source is pressurized by the gas circulation device 18, the flue gas inlet valve 11 is opened, so that the carbon dioxide gas source is input into the wet grinding device through the flue gas inlet 12; opening a feed port valve 3, and inputting solid waste slurry into a wet grinding device through a solid waste raw material feed port 4 by a solid waste raw material supply system 1; the stirring blade 8 is driven to rotate by the output power of the mill motor 9, so that a carbon dioxide gas source, solid waste slurry and grinding balls are mixed for wet grinding treatment, and when the wet grinding treatment is carried out, the valve 6 of the cleaning discharge hole is in a closed state, and the gas-liquid mixture is discharged through the discharge hole 14 after continuous production; after wet grinding treatment is completed, the feed port valve 3 is closed, the equipment cleaning discharge port valve 6 is opened, and materials in the cylinder are recycled to the solid waste raw material recycling system 2 through the equipment cleaning discharge port 5; the mixture of the carbonized solid waste slurry and the wet grinding residual gas output by the discharge port 14 is subjected to gas-liquid separation by the gas-liquid separation transfer tank 15, and the wet grinding residual gas enters the carbon dioxide concentration sensor 16, and the recovered gas control valve 17 and the external exhaust gas control valve 21 are in a closed state; detecting the carbon dioxide concentration of the wet grinding residual gas, if the result is higher than the set concentration, opening a recovered gas control valve 17, and conveying the recovered gas to a gas circulation device 18 to be used as a carbon dioxide gas source for recycling; if the result is not higher than the set concentration, opening the exhaust gas control valve 21, conveying the exhaust gas to the gas recovery tank 22, and recovering the exhaust gas through saturated lime water in the tank; the carbonization treatment solid waste slurry separated by the gas-liquid separation transfer tank 15 is input and sent to the carbonization slurry storage tank 20, at this time, the discharge port control valve 24 is in a closed state, the carbonization treatment solid waste slurry is kept stirring under the rotation of the carbonization slurry stirrer 19, and when discharging is required, the discharge port control valve 24 is opened, and the carbonization treatment solid waste slurry is output by the discharge port 23.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (9)
1. A carbon sequestration process for autoclaved aerated concrete products, comprising the steps of:
(1) Pressurizing a carbon dioxide gas source to obtain pressurized gas; the solid waste is mixed by water injection to obtain solid waste slurry;
(2) Wet grinding the solid waste slurry in the pressurized gas atmosphere to obtain carbonized solid waste slurry; after the wet grinding treatment is finished, detecting the carbon dioxide concentration of the wet grinding residual gas, collecting the wet grinding residual gas which is not lower than the set concentration, recycling the wet grinding residual gas as a carbon dioxide gas source, and directly recycling the wet grinding residual gas which is lower than the set concentration;
(3) Mixing the carbonized solid waste slurry with the solid waste, the auxiliary materials and the additives which are not carbonized, or mixing the carbonized solid waste slurry with the auxiliary materials and the additives only to obtain mixed slurry; the mixed slurry is subjected to resting treatment under set conditions to obtain an aerated concrete blank;
(4) Performing autoclaved curing on the aerated concrete blank body under the carbon dioxide atmosphere with set concentration to obtain an autoclaved aerated concrete product; after the autoclaved curing is finished, recycling autoclaved residual gas and recycling the residual gas as a carbon dioxide gas source;
the flow of the carbon sealing method is completed through a carbon sealing device, and the device comprises a solid waste slurry supply and recovery system, a wet solid carbon grinding system, a gas circulation system and a solid carbon slurry storage system;
the solid waste slurry supply and recovery system comprises a solid waste raw material supply system (1), a solid waste raw material recovery system (2), a feed inlet valve (3), a solid waste raw material feed inlet (4), an equipment cleaning discharge outlet (5) and an equipment cleaning discharge outlet valve (6);
The wet carbon-fixing grinding system comprises a grinding machine barrel (7), a stirring blade (8), a grinding machine motor (9), a wear-resistant barrel bottom (10), a smoke gas inlet valve (11), a smoke gas inlet (12), a cavity (13) and a discharge port (14);
The solid waste raw material feed inlet (4) is communicated with the bottom end of the mill barrel (7) along the tangential direction, the inner cavity of the wet solid carbon milling system is communicated with the solid waste raw material supply system (1) through the solid waste raw material feed inlet (4), and the solid waste raw material feed inlet (4) is provided with a feed inlet valve (3) for controlling the opening and closing states of the solid waste raw material feed inlet; the stirring blades (8) are arranged along the central axis direction of the mill barrel (7), the mill motor (9) is arranged at the top of the mill barrel (7), the rotating shaft of the stirring blades (8) penetrates through the top wall of the mill barrel (7) and is connected with the mill motor (9), and the stirring blades (8) are driven to rotate by the driving of the mill motor (9); the wear-resistant barrel bottom (10) is arranged at the bottom of the mill barrel (7), and the height of the contact part of the wear-resistant barrel bottom (10) and the inner wall of the mill barrel (7) is not higher than the height of the lower wall of the solid waste raw material feed inlet (4); the equipment cleaning discharge port (5) is communicated with the bottom end of the mill barrel (7) and is communicated with the solid waste raw material recovery system (2), and the equipment cleaning discharge port (5) is provided with an equipment cleaning discharge port valve (6) for controlling the opening and closing states of the equipment cleaning discharge port valve; the flue gas inlet (12) is communicated with the bottom end of the mill barrel (7) along the tangential direction, the height of the upper wall of the flue gas inlet (12) is not higher than the height of the contact part of the wear-resistant barrel bottom (10) and the inner wall of the mill barrel (7), the flue gas inlet (12) is provided with a flue gas inlet valve (11) for controlling the opening and closing state of the flue gas inlet, a cavity (13) is formed by surrounding the lower part of the wear-resistant barrel bottom (10) and the bottom wall of the mill barrel (7), and the discharge port (14) is communicated with the upper end of the mill barrel (7) along the tangential direction;
The gas circulation system comprises a gas-liquid separation transfer tank (15), a carbon dioxide concentration sensor (16), a recovered gas control valve (17), a gas circulation device (18), an external exhaust gas control valve (21) and a gas recovery tank (22);
The carbon-fixing slurry storage system comprises a carbonization slurry stirrer (19), a carbonization slurry storage tank (20), a discharge port (23) and a discharge port control valve (24);
The gas-liquid separation transfer tank (15) is communicated with the discharge port (14), the carbon dioxide concentration sensor (16) and the carbonized slurry storage tank (20), the carbon dioxide concentration sensor (16) is communicated with the gas circulation device (18) and the gas recovery tank (22), and the connecting channels of the carbon dioxide concentration sensor (16) and the gas circulation device (18) and the gas recovery tank (22) are respectively provided with a recovered gas control valve (17) and an external exhaust gas control valve (21) for controlling the opening and closing states of the connecting channels; the carbonization slurry stirrer (19) is arranged in the inner cavity of the carbonization slurry storage tank (20), the discharge port (23) is communicated with the bottom of the carbonization slurry storage tank (20) along the tangential direction, and the discharge port (23) is provided with a discharge port control valve (24).
2. The method according to claim 1, characterized in that: in the step (1), the concentration of carbon dioxide in the carbon dioxide gas source is more than or equal to 5%, the concentration of sulfur dioxide is less than or equal to 2%, and the content of other components meets the requirements of GB 13223-2011; the carbon dioxide gas source comprises industrial flue gas or captured and recovered carbon dioxide gas; the pressure of the pressurized gas is 0.2-0.35 MPa.
3. The method according to claim 1, characterized in that: in the step (1), the total content of calcium oxide and silicon oxide in the solid waste is more than or equal to 25wt.%; the median particle diameter of the solid waste is less than or equal to 300 mu m; the solid waste comprises at least one of steel slag, construction waste micropowder, fly ash, high-calcium fly ash, red mud, slag, magnesium slag, phosphorus slag, aerated block waste, nickel slag and copper slag; the mass ratio of the solid waste to the water is 1:0.8 to 5.
4. The method according to claim 1, characterized in that: in the step (2), in the wet grinding treatment, the conveying rate of the solid waste slurry is 30-70L/min, and the ball-to-material ratio of the grinding balls to the solid waste slurry is 1: 0.2-2, wet milling speed is 200-800 rpm; collecting wet grinding residual gas with carbon dioxide concentration more than or equal to 5%, recycling as a carbon dioxide gas source, and directly recovering the wet grinding residual gas with carbon dioxide concentration less than 5%.
5. The method according to claim 1, characterized in that: in the step (3), the auxiliary materials comprise cement, lime and gypsum; the additive comprises an air entraining agent and a foam stabilizer; the cement is Portland cement or ordinary Portland cement, and the strength grade is 42.5; the calcium oxide content of the lime is more than or equal to 85 percent; the gypsum is one of desulfurized gypsum, phosphogypsum and natural gypsum, and the content of phosphorus and fluorine is less than or equal to 1 percent; the air entraining agent is one of aluminum powder, sodium dodecyl sulfate, sodium fatty alcohol polyoxyethylene ether sulfate and rosin soap foaming agent, and the standard mesh number of the air entraining agent is less than or equal to 80 meshes; the foam stabilizer is one of natural gleditsia sinensis extract, polyacrylamide and cellulose ether.
6. The method according to claim 5, wherein: the total dosage of the solid waste and the carbonized solid waste slurry is 480 parts by weight, wherein the dosage of the carbonized solid waste slurry is 48-480 parts; the cement is 90-120 parts, the lime is 50-85 parts, and the gypsum is 15-25 parts; the air entraining agent is 5-10 parts, and the foam stabilizer is 0.8-1.3 parts.
7. The method according to claim 1, characterized in that: in the step (3), the mixing speed is 350-450 rpm, and the mixing time is 3-5 min; the resting treatment is that the resting is carried out for 1.5 to 2.5 hours at the temperature of 45 to 55 ℃.
8. The method according to claim 1, characterized in that: in the step (4), the carbon dioxide concentration of the carbon dioxide atmosphere is more than or equal to 85%; the autoclaved curing temperature is 170-190 ℃, the pressure is 0.5-1.3 MPa, and the autoclaved curing time is 4-10 h.
9. The method according to claim 1, characterized in that: the wear-resistant cylinder bottom (10) is of an arc-shaped structure made of wear-resistant alloy steel, and each square centimeter is provided with 1-5 round holes with the aperture of 0.5-3 mm; the rotation speed of the carbonization slurry stirrer (19) is more than or equal to 50rpm when the carbonization slurry stirrer works.
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| CN116396053A (en) * | 2023-03-03 | 2023-07-07 | 湖北工业大学 | Negative carbon foam concrete and preparation method thereof |
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| CN109368642A (en) * | 2018-11-27 | 2019-02-22 | 中国矿业大学 | A method of promoting fresh concrete absorbing carbon dioxide efficiency |
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