CN113461403A - Pretreated semidry-method sintered desulfurized ash autoclaved aerated concrete and preparation method thereof - Google Patents
Pretreated semidry-method sintered desulfurized ash autoclaved aerated concrete and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title description 8
- 239000002956 ash Substances 0.000 claims abstract description 80
- 238000005245 sintering Methods 0.000 claims abstract description 45
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000010881 fly ash Substances 0.000 claims abstract description 38
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 37
- 230000023556 desulfurization Effects 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 29
- 239000000292 calcium oxide Substances 0.000 claims abstract description 23
- 239000002002 slurry Substances 0.000 claims abstract description 22
- 239000004568 cement Substances 0.000 claims abstract description 21
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 19
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 19
- 239000010440 gypsum Substances 0.000 claims abstract description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 18
- 239000004576 sand Substances 0.000 claims abstract description 16
- 230000029087 digestion Effects 0.000 claims abstract description 12
- 238000000498 ball milling Methods 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 230000003068 static effect Effects 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 16
- 239000004566 building material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 239000011449 brick Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000002994 raw material 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
- 239000011575 calcium Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000012798 spherical particle Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000011464 hollow brick Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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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
- C04B28/144—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 a flue gas desulfurization product
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses pretreated semidry sintering desulfurization ash autoclaved aerated concrete and a preparation method thereof, wherein the pretreated semidry sintering desulfurization ash autoclaved aerated concrete comprises 5-10% of cement, 10-15% of quicklime, 1-25% of semidry sintering desulfurization ash, 35-50% of fly ash, 20-30% of tailing sand, 3-5% of desulfurization gypsum and 0.08-0.1% of aluminum paste by mass percent, and water, wherein the water-material ratio is 0.5-0.65, and the semidry sintering desulfurization ash is obtained by adding water for digestion and ball milling pretreatment. And (3) stirring the dried material and water, adding aluminum paste dissolved in a small amount of water, pouring the slurry into a mold, standing, curing and forming, demolding, cutting, and performing autoclaved curing to obtain the aluminum-based composite material. The autoclaved aerated concrete disclosed by the invention is good in stability, compressive strength, dry density and durability, the problem of long setting time of autoclaved aerated concrete slurry caused by too high mixing amount of desulfurized ash is avoided, and meanwhile, waste is changed into valuable.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to pretreated semi-dry sintered desulfurized ash autoclaved aerated concrete and a preparation method thereof.
Background
In recent years, sustainable development has become a global concern. The coal-fired power generation industry, industrial boilers and sintering plants consume a large amount of fossil fuels every year and simultaneously discharge a large amount of SO2The semidry flue gas desulfurization has the advantages of low investment, high reaction speed, high desulfurization efficiency, no wastewater discharge and the like as a desulfurization technology, however, desulfurization ash is difficult to recycle, and about 1600 ten thousand tons of desulfurization ash are produced every year in China, and billions of tons are accumulated until 2020. The desulfurization ash usually contains calcium sulfite, dihydrate gypsum, calcium carbonate, silicon dioxide and unreacted calcium hydroxide, and the desulfurization ash generated by domestic power plants is mostly stacked in the open air at present, and dust emission causes serious pollution to the atmosphere and soil. The desulfurized fly ash, as a solid waste, has a certain chemical instability, mainly due to f-CaO and CaSO therein3The content of f-CaO in the desulfurized fly ash is higher, and the f-CaO can generate Ca (OH) through chemical reaction in the long-term hydration process2Causing the volume expansion while continuing to release heat, resulting in instability of the desulfurized fly ash; CaSO3Easily decompose and release SO at high temperature2The rate of decomposition is directly proportional to the temperature rise. Therefore, when the desulfurized ash is directly used as an additive for cement admixture, brick and tile blocks, concrete and other materials, the structure of the building material can be damaged, and the service life of the building can be further influenced. The pretreatment of digesting and grinding the desulfurized fly ash can improve the influence caused by later expansion of the desulfurized fly ash, and the digestion can convert the f-CaO in the desulfurized fly ash into Ca (OH) in advance through hydration reaction2The stability of the desulfurized fly ash is improved; the uniformity of the desulfurized fly ash can be improved by levigating the desulfurized fly ash, so that the desulfurized fly ash is more compact in filling effect and is originally not usedThe regular spherical particles are changed into the regular spherical particles, the surfaces of the particles are rougher, the contact area of the desulfurization ash participating in hydration reaction is increased, and the activity of the desulfurization ash is effectively improved.
Autoclaved aerated concrete as a novel building material is mainly prepared from quick lime, cement, siliceous materials and water. The chemical components of the desulfurization ash contain active SiO2、Al2O3And effective CaO, has fine particles, higher volcanic ash activity and self-gelation property, and can replace partial siliceous materials or quicklime. Meanwhile, the autoclaved aerated concrete is used as a novel light building material which is being vigorously developed in China, has the advantages of light weight, high thermal resistance, good processability, waste utilization benefiting, environmental protection and the like, has performance superior to that of clay bricks, hollow bricks and common concrete, is a building material which can meet 50 percent of energy-saving standard by only one single wall body in China at present, is widely applied to various building structure systems, and becomes a leading product for replacing solid clay bricks.
The resource application of the desulfurized ash in the autoclaved aerated concrete is beneficial to relieving the problem of industrial resource shortage, realizes the recycling of waste resources, has important guiding significance for the development of green building material industry, and has positive promoting effects on protecting environment, developing green building materials and relieving urban operation pressure.
Disclosure of Invention
In view of the above, the main object of the present invention is to provide a pretreated semidry sintering desulfurization ash autoclaved aerated concrete, wherein the pretreated semidry sintering desulfurization ash is used as a substitute for part of calcareous materials, siliceous materials and desulfurization gypsum in the autoclaved aerated concrete, so as to solve the problem of large-scale and stable application of the semidry sintering desulfurization ash in the autoclaved aerated concrete.
The invention also aims to provide a preparation method of the pretreated semidry sintered desulfurized fly ash autoclaved aerated concrete.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides pretreated semidry sintering desulfurized ash autoclaved aerated concrete which comprises, by mass, 5-10% of cement, 10-15% of quicklime, 1-25% of semidry sintering desulfurized ash, 35-50% of fly ash, 20-30% of tailing sand, 3-5% of desulfurized gypsum and 0.08-0.1% of aluminum paste, wherein the water-material ratio is 0.5-0.65, and the semidry sintering desulfurized ash is obtained by adding water for digestion and ball milling pretreatment.
Furthermore, the content of the semi-dry sintering desulfurization ash is not more than 25 percent, and the SO content meets the national regulation3The content of the semi-dry sintering desulfurization ash is not more than 3.5 percent, and the content of the semi-dry sintering desulfurization ash is preferably not more than 20 percent.
Further, the content of the semi-dry sintering desulfurization ash is 14%.
Further, the water-material ratio of the semi-dry sintered desulfurized ash autoclaved aerated concrete is 0.625.
Further, the cement is 42.5-grade ordinary portland cement.
The invention also provides a preparation method of the pretreated semidry sintered desulfurized ash autoclaved aerated concrete, which comprises the following steps:
s1, adding 15-30% of water into semi-dry sintering desulfurized ash for digestion and ball-milling for 20min for pretreatment;
s2, weighing cement, quicklime, semi-dry sintering desulfurized ash pretreated in the step S1, fly ash, tailing sand, desulfurized gypsum, aluminum paste and the rest water according to the mass percentage;
s3, uniformly mixing the semi-dry sintering desulfurized fly ash, cement, quicklime, fly ash, tailing sand and desulfurized gypsum in the step S2 to prepare a dry material;
s4, pouring the dry materials obtained in the step S3 and water with the temperature of 50-70 ℃ into a tailing mortar stirrer to be stirred to obtain evenly stirred slurry;
s5, pouring the aluminum paste dissolved in a small amount of water into the slurry uniformly stirred in the step S4, and uniformly stirring;
s6, pouring the slurry obtained in the step S5 into a mold, performing static curing at a constant temperature of 50 ℃ for forming, demolding after 2.5 hours, and cutting to obtain a formed autoclaved aerated concrete block;
and S7, placing the autoclaved aerated concrete block in the step S6 in an autoclaved curing kettle with the pressure of 1.2MPa and the temperature of 180-.
Compared with the prior art, the invention can obtain the following technical effects:
(1) the semi-dry sintering desulfurized ash autoclaved aerated concrete has good stability, compressive strength, dry density and durability, can ensure that the semi-dry sintering desulfurized ash reaches higher mixing amount, and can avoid the problem that the properties of the autoclaved aerated concrete are influenced by overhigh mixing amount of the desulfurized ash, such as long setting time of autoclaved aerated concrete slurry.
(2) The semi-dry process sintered desulfurized ash autoclaved aerated concrete uses the pretreated semi-dry process sintered desulfurized ash as substitutes of partial calcareous materials, siliceous materials and desulfurized gypsum in the autoclaved aerated concrete, not only solves the problem of large-scale and stable application of the semi-dry process sintered desulfurized ash in the autoclaved aerated concrete materials, but also solves the problems of land resource occupation and environment pollution of desulfurized ash pile filling, and realizes the purpose of changing waste into valuable.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a process flow chart of the semi-dry method sintered desulfurized fly ash autoclaved aerated concrete.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides pretreated semidry sintering desulfurization ash autoclaved aerated concrete which comprises, by mass, 5% -10% of cement, 10% -15% of quicklime, 1% -25% of semidry sintering desulfurization ash, 35% -50% of fly ash, 20% -30% of tailing sand, 3% -5% of desulfurization gypsum and 0.08% -0.1% of aluminum paste, wherein the water-material ratio is 0.5-0.65, and the semidry sintering desulfurization ash is obtained by a pretreatment mode of adding water for digestion and ball milling for 20 min.
In some embodiments, the semi-dry sintered desulfurized fly ash is present in an amount of 14%.
In some embodiments, the water-to-material ratio of the semi-dry sintered desulfurized ash autoclaved aerated concrete is 0.625.
In some embodiments, the cement is a 42.5 grade portland cement.
Referring to fig. 1, the invention further provides a preparation method of the pretreated semidry sintered desulfurized fly ash autoclaved aerated concrete, which comprises the following steps:
s1, carrying out pretreatment of adding 15-30% of water to the semi-dry sintering desulfurized ash for digestion and ball milling for 20 min;
s2, weighing cement, quicklime, semi-dry sintering desulfurized ash pretreated in the step S1, fly ash, tailing sand, desulfurized gypsum, aluminum paste and the rest water according to the mass percentage;
s3, uniformly mixing the pretreated semi-dry sintered desulfurized fly ash, cement, quick lime, fly ash, tailing sand and desulfurized gypsum to prepare a dry material;
s4, pouring the dry materials obtained in the step S3 and water with the temperature of 50-70 ℃ into a tailing mortar stirrer to be stirred to obtain evenly stirred slurry;
s5, pouring the aluminum paste dissolved in a small amount of water into the slurry uniformly stirred in the step S4, and uniformly stirring;
s6, pouring the slurry obtained in the step S5 into a mold, performing static curing at a constant temperature of 50 ℃ for forming, demolding after 2.5 hours, and cutting to obtain a formed autoclaved aerated concrete block;
and S7, placing the autoclaved aerated concrete block in the step S6 in an autoclaved curing kettle with the pressure of 1.2MPa and the temperature of 180-.
The technical solution of the present invention is further explained by the following specific examples.
Example 1
The pretreated semidry sintering desulfurized ash autoclaved aerated concrete comprises an admixture composed of, by mass, 7% of cement, 12% of quicklime, 14% of semidry sintering desulfurized ash, 40.9% of fly ash, 23% of tailing sand, 3% of desulfurized gypsum and 0.1% of aluminum paste, and water, wherein the semidry sintering desulfurized ash is obtained by adding water for digestion and ball milling for 20min, the admixture is 0.14, and the water-material ratio of the semidry sintering desulfurized ash autoclaved aerated concrete is 0.625.
The pretreated semidry method sintered desulfurized ash autoclaved aerated concrete is prepared by the following steps:
s1, adding 20% of water into the semi-dry sintering desulfurized ash for digestion and carrying out ball milling for 20min for pretreatment;
s2, weighing the raw materials according to the mass percentage of the pretreated semidry sintering desulfurized ash autoclaved aerated concrete;
s3, uniformly mixing the semi-dry sintering desulfurized fly ash pretreated in the step S1, cement, quicklime, fly ash, tailing sand and desulfurized gypsum to prepare a dry material;
s4, pouring the aluminum paste dissolved in the water into the uniformly stirred slurry, and uniformly stirring;
s5, pouring the slurry into a mold, performing static curing at a constant temperature of 50 ℃ to mold the slurry, demolding after 2.5 hours, and cutting to obtain a molded autoclaved aerated concrete block;
s6, placing the autoclaved aerated concrete block in an autoclaved curing kettle with the pressure of 1.2MPa and the temperature of 180 ℃, and carrying out autoclaved curing for 8h to obtain the pretreated semi-dry sintered desulfurized ash autoclaved aerated concrete.
The performance of the block meets the performance requirement of B06-grade autoclaved aerated concrete blocks.
Example 2
The pretreated semidry sintering desulfurization ash autoclaved aerated concrete comprises an admixture composed of, by mass, 7% of cement, 11.5% of quicklime, 20% of semidry sintering desulfurization ash, 37.5% of fly ash, 21.4% of tailing sand, 2.5% of desulfurization gypsum and 0.1% of aluminum paste, and water, wherein the semidry sintering desulfurization ash is obtained by adding water for digestion and carrying out ball milling for 20min, the mixing amount is 0.20, and the water-material ratio of the semidry sintering desulfurization ash autoclaved aerated concrete is 0.625.
The pretreated semidry method sintered desulfurized ash autoclaved aerated concrete is prepared by the following steps:
s1, adding 20% of water into the semi-dry sintering desulfurized ash for digestion and carrying out ball milling for 20min for pretreatment;
s2, weighing the raw materials according to the mass percentage of the pretreated semidry sintering desulfurized ash autoclaved aerated concrete;
s3, uniformly mixing the semi-dry sintering desulfurized fly ash pretreated in the step S1, cement, quicklime, fly ash, tailing sand and desulfurized gypsum to prepare a dry material;
s4, pouring the aluminum paste dissolved in the water into the uniformly stirred slurry, and uniformly stirring;
s5, pouring the slurry into a mold, performing static curing at a constant temperature of 50 ℃ to mold the slurry, demolding after 2.5 hours, and cutting to obtain a molded autoclaved aerated concrete block;
s6, placing the autoclaved aerated concrete block in an autoclaved curing kettle with the pressure of 1.2MPa and the temperature of 200 ℃, and carrying out autoclaved curing for 10h to obtain the pretreated semi-dry sintered desulfurized ash autoclaved aerated concrete.
The performance of the block meets the performance requirement of B06-grade autoclaved aerated concrete blocks.
Comparative example 1
The untreated semi-dry sintered desulfurized ash autoclaved aerated concrete comprises an admixture composed of 7 mass percent of cement, 12 mass percent of quicklime, 14 mass percent of semi-dry sintered desulfurized ash, 40.9 mass percent of fly ash, 23 mass percent of tailing sand, 3 mass percent of desulfurized gypsum and 0.1 mass percent of aluminum paste and water, wherein the semi-dry sintered desulfurized ash is untreated and the admixture amount is 0.14, and the water-material ratio of the semi-dry sintered desulfurized ash autoclaved aerated concrete is 0.625.
The preparation method of the semi-dry sintered desulfurized fly ash autoclaved aerated concrete without pretreatment comprises the following steps:
s1, weighing raw materials according to the mass percentage of the untreated semi-dry sintered desulfurized ash autoclaved aerated concrete;
s2, uniformly mixing the semi-dry sintered desulfurized fly ash which is not pretreated in the step S1, cement, quicklime, fly ash, tailing sand and desulfurized gypsum to prepare a dry material;
s3, pouring the dry materials and warm water of 50-70 ℃ into a tailing mortar stirrer to be stirred to obtain evenly stirred slurry;
s4, pouring the aluminum paste dissolved in the water into the uniformly stirred slurry, and uniformly stirring;
s5, pouring the slurry into a mold, performing static curing at a constant temperature of 50 ℃ to mold the slurry, demolding after 2.5 hours, and cutting to obtain a molded autoclaved aerated concrete block;
and S6, placing the autoclaved aerated concrete block in an autoclaved curing kettle with the pressure of 1.2MPa and the temperature of 180 ℃, and carrying out autoclaved curing for 8h to obtain the non-pretreated semi-dry sintered desulfurized ash autoclaved aerated concrete.
Tests prove that the compressive strength of the semi-dry sintered desulfurized ash autoclaved aerated concrete which is not pretreated in the comparative example 1 is 3.0-3.6 MPa, and the dry density is 680-720 kg/m3Within the range, the performance index requirements of B06-grade autoclaved aerated concrete are not met, and the comprehensive performance of the autoclaved aerated concrete is obviously lower than that of the desulfurized ash autoclaved aerated concrete sintered by the semidry method after pretreatment in example 1.
Claims (6)
1. The pretreated semidry sintering desulfurization ash autoclaved aerated concrete is characterized by comprising 5-10% of cement, 10-15% of quicklime, 1-25% of semidry sintering desulfurization ash, 35-50% of fly ash, 20-30% of tailing sand, 3-5% of desulfurization gypsum and 0.08-0.1% of aluminum paste by mass percent, and water, wherein the water-material ratio is 0.5-0.65, and the semidry sintering desulfurization ash is obtained by adding water for digestion and ball milling pretreatment.
2. The pretreated semidry sintered desulfurized ash autoclaved aerated concrete according to claim 1, wherein the content of the semidry sintered desulfurized ash is not more than 20%.
3. The pretreated semidry sintered desulfurized ash autoclaved aerated concrete according to claim 2, wherein the content of the semidry sintered desulfurized ash is 14%.
4. The pretreated semidry sintered desulfurized ash autoclaved aerated concrete according to claim 1, wherein the water-to-material ratio of the semidry sintered desulfurized ash autoclaved aerated concrete is 0.625.
5. The pretreated semidry sintered desulfurized fly ash autoclaved aerated concrete according to claim 1, wherein the cement is 42.5-grade ordinary portland cement.
6. The preparation method of the pretreated semidry sintered desulfurized ash autoclaved aerated concrete according to any one of claims 1 to 5, which is characterized by comprising the following steps:
s1, adding 15-30% of water into the semi-dry sintering desulfurization ash for digestion and carrying out ball milling for 20min for pretreatment;
s2, weighing cement, quicklime, the semi-dry sintering desulfurized ash pretreated in the step S1, fly ash, tailing sand, desulfurized gypsum, aluminum paste and the rest water according to the mass percentage;
s3, uniformly mixing the semi-dry sintering desulfurized fly ash, cement, quicklime, fly ash, tailing sand and desulfurized gypsum in the step S2 to prepare a dry material;
s4, pouring the dry materials obtained in the step S3 and water with the temperature of 50-70 ℃ into a tailing mortar stirrer to be stirred to obtain evenly stirred slurry;
s5, pouring the aluminum paste dissolved in a small amount of water into the slurry uniformly stirred in the step S4, and uniformly stirring;
s6, pouring the slurry obtained in the step S5 into a mold, performing static curing at a constant temperature of 50 ℃ for forming, demolding after 2.5 hours, and cutting to obtain a formed autoclaved aerated concrete block;
and S7, placing the autoclaved aerated concrete block in the step S6 in an autoclaved curing kettle with the pressure of 1.2MPa and the temperature of 180-.
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| CN202110830465.XA CN113461403A (en) | 2021-07-22 | 2021-07-22 | Pretreated semidry-method sintered desulfurized ash autoclaved aerated concrete and preparation method thereof |
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