CN115180860A - Preparation method of harmless aluminum ash applied to concrete expanding agent - Google Patents
Preparation method of harmless aluminum ash applied to concrete expanding agent Download PDFInfo
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- CN115180860A CN115180860A CN202210933744.3A CN202210933744A CN115180860A CN 115180860 A CN115180860 A CN 115180860A CN 202210933744 A CN202210933744 A CN 202210933744A CN 115180860 A CN115180860 A CN 115180860A
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- aluminum
- aluminum ash
- expanding agent
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 52
- 239000004567 concrete Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 56
- 235000019738 Limestone Nutrition 0.000 claims abstract description 18
- 239000006028 limestone Substances 0.000 claims abstract description 18
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 16
- 239000010440 gypsum Substances 0.000 claims abstract description 16
- 239000011575 calcium Substances 0.000 claims abstract description 11
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 11
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 10
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000292 calcium oxide Substances 0.000 claims abstract description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 8
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 8
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 8
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 8
- 229910052925 anhydrite Inorganic materials 0.000 claims abstract description 7
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 7
- 102100038694 DNA-binding protein SMUBP-2 Human genes 0.000 claims abstract description 6
- 101000665135 Homo sapiens DNA-binding protein SMUBP-2 Proteins 0.000 claims abstract description 6
- 238000001354 calcination Methods 0.000 claims abstract description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 8
- 229910021529 ammonia Inorganic materials 0.000 claims description 8
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 8
- 239000011737 fluorine Substances 0.000 claims description 8
- 229910052731 fluorine Inorganic materials 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 238000012216 screening Methods 0.000 claims description 7
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 6
- 238000000498 ball milling Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 2
- 150000003841 chloride salts Chemical class 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 239000000706 filtrate Substances 0.000 claims description 2
- 150000004673 fluoride salts Chemical class 0.000 claims description 2
- 238000006460 hydrolysis reaction Methods 0.000 claims description 2
- 239000002244 precipitate Substances 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 238000010992 reflux Methods 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 238000006115 defluorination reaction Methods 0.000 claims 1
- 239000002956 ash Substances 0.000 description 24
- 235000012255 calcium oxide Nutrition 0.000 description 6
- 235000012245 magnesium oxide Nutrition 0.000 description 6
- 239000000654 additive Substances 0.000 description 4
- 229910001570 bauxite Inorganic materials 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 229910001653 ettringite Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
-
- 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)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a preparation method of harmless aluminum ash applied to a concrete expanding agent, wherein the concrete expanding agent comprises the following substances in percentage by mass: expanding agent clinker: 10 to 60 percent of natural gypsum, 5 to 40 percent of natural gypsum and 5 to 20 percent of limestone; the expanding agent clinker comprises the following substances in percentage by mass: 1-10% of harmless aluminum ash, 10-30% of anhydrite and 40-80% of limestone; the expanding agent clinker comprises the following components: 1-6.2 parts of silicon dioxide, 1-5.5 parts of aluminum oxide, 0.5-4.2 parts of ferric oxide, 40-80 parts of calcium oxide, 0.4-4.1 parts of magnesium oxide and 6.5-20.4 parts of sulfur trioxide, wherein the preparation method of the expanding agent clinker comprises the following steps: and calcining the harmless aluminum ash, the natural gypsum and the limestone at 1200-1400 ℃ to obtain the HCSA calcium sulphoaluminate expanding agent clinker.
Description
Technical Field
The invention belongs to the field of building materials, and relates to an improvement on a production technology of a concrete expanding agent. In particular to a preparation method of harmless aluminum ash applied to a concrete expanding agent.
Background
The concrete expanding agent is an additive which can expand a certain volume of concrete due to chemical action in the hardening process after being doped into the concrete, and the concrete expanding agent comprises the following chemical components: calcium oxides, calcium thioaluminates, calcium thioaluminate-calcium oxides, magnesium oxides, and iron oxides. In recent years, with the accumulation of industrial solid waste and the potential threat caused by the solid waste itself, the resource utilization of industrial solid waste has become a hot spot of current research. In the research of concrete expanding agents, the preparation of concrete expanding agents by using industrial waste residues becomes the future development trend of the concrete expanding agent industry, for example, the preparation of concrete expanding agents by using industrial waste residues such as phosphogypsum, dolomite, fly ash, aluminum ash and the like.
The concrete expanding agent is an additive which is mixed with cement and water and then undergoes hydration reaction to generate ettringite, calcium hydroxide or ettringite and calcium hydroxide so as to expand the volume of concrete. The concrete material has strength increase and volume shrinkage during hydration hardening, and the shrinkage deformation causes cracks inside the concrete, thereby affecting the stress performance and durability of the concrete. With the wide application of high-performance concrete, the generation of concrete cracks can be prevented or reduced by adding a proper amount of expanding agent into the concrete. The expanding agent is mainly used in underground waterproof, large-structure and large-volume concrete and other projects, and is widely applied to buildings such as subways, high-speed rails, warehouses, tunnels, mixing plants and the like.
At present, calcium sulphoaluminate expansive agents taking ettringite as a main expansion source are commonly adopted in concrete structural engineering in China, but along with the high-speed development of economy, excessive exploitation causes that bauxite resources and anhydrite resources in China are gradually deficient, the reserved resources are rapidly reduced, and the production cost of the expansive agents is increased. In addition, many enterprises adopt cheap raw materials with low Al2O3 and SO3 contents based on cost consideration, which results in low expansion performance of the expanding agent. The excessive exploitation of precious mineral resources such as alumina is not beneficial to protecting the ecological environment and saving resources, and goes against the strategic requirements of sustainable development.
Disclosure of Invention
The invention aims to provide a preparation method of harmless aluminum ash applied to a concrete expanding agent, wherein the concrete expanding agent comprises the following substances in percentage by mass:
expanding agent clinker: 10 to 60 percent of natural gypsum, 5 to 40 percent of natural gypsum and 5 to 20 percent of limestone;
the expanding agent clinker comprises the following substances in percentage by mass:
1-10% of harmless aluminum ash, 10-30% of anhydrite and 40-80% of limestone;
the processing technology of the harmless aluminum ash comprises the following steps:
(1) Coarse screening: roughly screening the aluminum slag by using a vibrating screen, manually crushing oversize materials, and completely crushing small aluminum ash by using undersize materials in a ball mill to completely separate aluminum particles from the aluminum ash;
(2) Ball milling and screening: conveying the aluminum ash in an aluminum ash bin to a ball mill by using an electromagnetic vibration feeder for ball milling, enabling the materials to spirally and uniformly enter a first bin of the mill through a feeding hollow shaft by a feeding device, arranging a stepped lining plate or a corrugated lining plate in the bin, internally filling steel balls with different specifications, enabling the steel balls to fall after a certain high degree is generated by the rotation of a cylinder body, generating heavy impact and grinding effects on the materials, enabling the materials to enter a second bin through a single-layer partition plate after the materials reach coarse grinding in the first bin, inlaying a flat lining plate in the bin, and further grinding the materials, wherein the steel balls are arranged in the bin, the materials are ground into powder after ball milling, and because the ductility of aluminum is very good, smaller aluminum particles can be pressed to play by ball milling, so that the aluminum particles are gradually enlarged in the grinding process and are more easily sorted, and the powder is discharged through a discharging grate plate and enters a roller of a screening machine;
(3) Removing fluorine and ammonia: the screened fine aluminum ash mainly comprises alumina, metallic aluminum, aluminum nitride, fluoride salt, chloride salt and the like, wherein the aluminum nitride and water can generate hydrolysis reaction to generate ammonia gas and aluminum hydroxide precipitate, and the ammonia gas and the water dissolve to generate ammonia water, so that the aluminum ash is dissolved by using the water before removing fluorine and ammonia, the content of the aluminum nitride in the aluminum ash is generally about 15-30%, the aluminum nitride and the water react at normal temperature and are hydrolyzed completely along with the increase of time, and the solid-to-liquid ratio of the aluminum ash to the water is 1;
pre-checking: sampling and pre-detecting the powder to obtain the content and pH value of fluoride in the powder;
and (3) fluorine removal: dissolving the aluminum ash fine material by using water, wherein the solid-liquid ratio is 1; adjusting the pH value, and detecting that the fluoride concentration is qualified when the fluoride concentration is less than 100mg/L from a sampling port on the reaction bin;
pumping the qualified defluorinated slurry into a stirring tank through a slurry pump, adding aluminum sulfate into the stirring tank to remove ammonia through reaction, continuously stirring in the stirring tank for 48 hours to effectively remove ammonia gas in the raw materials,
(4) And (3) filter pressing and dewatering: after the fluorine and ammonia removal, pumping into a filter press for dehydration, and refluxing filtrate into the reaction bin for recycling; the filter-pressed material enters a ball pressing procedure,
(5) Pressing the ball: the filter-pressed aluminum ash is lifted to a high-level buffer bin by a bucket elevator, the bottom of the high-level buffer bin is connected with a tubular inclined spiral and is directly conveyed to a feed inlet of a ball press machine, the mixture is rolled and rolled on the ball press machine to prepare blocks of calcium aluminate raw materials, and the blocks are conveyed to a ton bag weighing machine by a belt to be packed.
Furthermore, the expanding agent clinker comprises the following components: 1 to 6.2 portions of silicon dioxide, 1 to 5.5 portions of aluminum oxide, 0.5 to 4.2 portions of ferric oxide, 40 to 80 portions of calcium oxide, 0.4 to 4.1 portions of magnesium oxide and 6.5 to 20.4 portions of sulfur trioxide,
the preparation method of the expanding agent clinker comprises the following steps: and calcining the harmless aluminum ash, the natural gypsum and the limestone at 1200-1400 ℃ to obtain the HCSA calcium sulphoaluminate expanding agent clinker.
Furthermore, the expanding agent clinker comprises the following components: 1.5 to 4.5 parts of silicon dioxide; 1.5 to 4.2 parts of aluminum oxide; 1-3 parts of ferric oxide; 45-60 parts of calcium oxide; 0.6 3-3 parts of magnesium oxide; 4 to 15 parts of sulfur trioxide.
The technical means adopted in the invention has the following remarkable characteristics, and forms outstanding technical progress:
(1) The waste aluminum slag is adopted to replace bauxite as a raw material, so that the production cost is saved, and the bauxite resource is prevented from being excessively exploited.
(2) Various additives are saved, so that the preparation process is saved, and the use cost of the additives is also saved.
(3) The product has excellent expansion performance and mechanical property.
Detailed Description
How the objects of the present invention are achieved is further illustrated below with reference to examples.
Example 1
And (2) using an expanding agent clinker: 50 percent of natural gypsum and 20 percent of limestone;
the expanding agent clinker comprises the following substances in percentage by mass: 5% of harmless aluminum ash, 22% of anhydrite and 77% of limestone;
the expanding agent clinker comprises the following components: 4.5 parts of silicon dioxide, 3.8 parts of aluminum oxide, 3 parts of ferric oxide, 65 parts of calcium oxide, 3 parts of magnesium oxide and 15 parts of sulfur trioxide,
the preparation method of the expanding agent clinker comprises the following steps: and calcining the harmless aluminum ash, the natural gypsum and the limestone at 1400 ℃ to obtain the HCSA calcium sulphoaluminate expanding agent clinker.
Example 2
And (2) using an expanding agent clinker: 60% of natural gypsum, 25% of natural gypsum and 15% of limestone;
the expanding agent clinker comprises the following substances in percentage by mass: 10% of harmless aluminum ash, 18% of anhydrite and 72% of limestone;
the expanding agent clinker comprises the following components: 4.2 parts of silicon dioxide, 4.2 parts of aluminum oxide, 4 parts of ferric oxide, 70 parts of calcium oxide, 4 parts of magnesium oxide and 12 parts of sulfur trioxide, wherein the preparation method of the expanding agent clinker comprises the following steps: and calcining the harmless aluminum ash, the natural gypsum and the limestone at 1300 ℃ to obtain the HCSA calcium sulphoaluminate expanding agent clinker.
Example 3
And (3) adding an expanding agent clinker: 55%, 27% of natural gypsum and 18% of limestone;
the expanding agent clinker comprises the following substances in percentage by mass: 9% of harmless aluminum ash, 25% of anhydrite and 66% of limestone;
the expanding agent clinker comprises the following components: 4.8 parts of silicon dioxide, 4 parts of aluminum oxide, 4.2 parts of ferric oxide, 60 parts of calcium oxide, 2.5 parts of magnesium oxide and 18 parts of sulfur trioxide, wherein the preparation method of the expanding agent clinker comprises the following steps: and calcining the harmless aluminum ash, the natural gypsum and the limestone at 1350 ℃ to obtain the HCSA calcium sulphoaluminate expanding agent clinker.
The foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and the following is the expansion data of calcium sulfoaluminate expansion agent calcined with harmless aluminum ash:
| numbering | 1d | 2d | 3d | 4d | 5d | 6d | 7d |
| 1 | 0.106 | 0.127 | 0.139 | 0.139 | 0.147 | 0.154 | 0.155 |
| 2 | 0.107 | 0.128 | 0.147 | 0.163 | 0.187 | 0.194 | 0.199 |
| 3 | 0.152 | 0.162 | 0.172 | 0.181 | 0.183 | 0.184 | 0.186 |
| 4 | 0.134 | 0.146 | 0.149 | 0.165 | 0.177 | 0.188 | 0.193 |
| 5 | 0.145 | 0.167 | 0.172 | 0.177 | 0.184 | 0.185 | 0.193 |
| 6 | 0.135 | 0.163 | 0.182 | 0.189 | 0.192 | 0.193 | 0.194 |
| 7 | 0.129 | 0.141 | 0.158 | 0.169 | 0.178 | 0.182 | 0.191 |
| 8 | 0.132 | 0.145 | 0.164 | 0.178 | 0.187 | 0.188 | 0.189 |
Claims (3)
1. A preparation method of harmless aluminum ash applied to a concrete expanding agent is characterized by comprising the following steps: the concrete expanding agent comprises the following substances in percentage by mass:
expanding agent clinker: 10 to 60 percent of natural gypsum, 5 to 40 percent of natural gypsum and 5 to 20 percent of limestone;
the expanding agent clinker comprises the following substances in percentage by mass:
1-10% of harmless aluminum ash, 10-30% of anhydrite and 40-80% of limestone;
the processing technology of the harmless aluminum ash comprises the following steps:
(1) Coarse screening: roughly screening the aluminum slag by using a vibrating screen, manually crushing oversize materials, and completely crushing small aluminum ash by using undersize materials in a ball mill to completely separate aluminum particles from the aluminum ash;
(2) Ball milling and screening: conveying the aluminum ash in an aluminum ash bin into a ball mill by using an electromagnetic vibrating feeder for ball milling, enabling the materials to spirally and uniformly enter a first bin of the mill through a feeding hollow shaft by a feeding device, wherein a stepped lining plate or a corrugated lining plate is arranged in the first bin, steel balls with different specifications are filled in the first bin, a cylinder body rotates to generate centrifugal force to bring the steel balls to a certain high degree and then fall down, and the material is subjected to pounding and grinding effects;
(3) Fluorine and ammonia removal: the screened fine aluminum ash mainly comprises alumina, metallic aluminum, aluminum nitride, fluoride salt, chloride salt and the like, wherein the aluminum nitride and water can generate hydrolysis reaction to generate ammonia gas and aluminum hydroxide precipitate, and the ammonia gas and the water dissolve to generate ammonia water, so that the aluminum ash is dissolved by using the water before removing fluorine and ammonia, the content of the aluminum nitride in the aluminum ash is generally about 15-30%, the aluminum nitride and the water react at normal temperature and are hydrolyzed completely along with the increase of time, and the solid-to-liquid ratio of the aluminum ash to the water is 1;
pre-checking: sampling and pre-detecting the powder to obtain the content and pH value of fluoride in the powder;
and (3) fluorine removal: dissolving the aluminum ash fine material by using water, wherein the solid-liquid ratio is 1; adjusting the pH value, and detecting that the fluoride concentration is qualified when the fluoride concentration is less than 100mg/L from a sampling port on the reaction bin;
pumping the qualified slag slurry after defluorination into a stirring tank through a slag slurry pump, adding aluminum sulfate into the stirring tank to remove ammonia by reaction, continuously stirring the stirring tank for 48 hours, effectively removing ammonia gas existing in raw materials,
(4) And (3) filter pressing and dewatering: after the fluorine and ammonia removal, pumping the mixture into a filter press for dehydration, and refluxing filtrate into a reaction bin for recycling; the filter-pressed material enters a ball pressing procedure,
(5) Pressing the ball: the filter-pressed aluminum ash is lifted to a high-level buffer bin by a bucket elevator, the bottom of the high-level buffer bin is connected with a tubular inclined spiral and is directly conveyed to a feed inlet of a ball press machine, the mixture is rolled and rolled on the ball press machine to prepare blocks of calcium aluminate raw materials, and the blocks are conveyed to a ton bag weighing machine by a belt to be packed.
2. The method for preparing harmless aluminum ash for use in concrete expansive agent according to claim 1, wherein the expansive agent clinker comprises the following components: 1 to 6.2 portions of silicon dioxide, 1 to 5.5 portions of aluminum oxide, 0.5 to 4.2 portions of ferric oxide, 40 to 80 portions of calcium oxide, 0.4 to 4.1 portions of magnesium oxide and 6.5 to 20.4 portions of sulfur trioxide;
the preparation method of the expanding agent clinker comprises the following steps: and calcining the harmless aluminum ash, the natural gypsum and the limestone at 1200-1400 ℃ to obtain the HCSA calcium sulphoaluminate expanding agent clinker.
3. The method for preparing harmless aluminum ash for use in concrete expansive agent according to claim 1, wherein the expansive agent clinker comprises the following components: 1.5 to 4.5 parts of silicon dioxide; 1.5 to 4.2 parts of aluminum oxide; 1-3 parts of ferric oxide; 45 to 60 parts of calcium oxide; 0.6 to 3 parts of magnesium oxide; 4 to 15 parts of sulfur trioxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210933744.3A CN115180860A (en) | 2022-08-04 | 2022-08-04 | Preparation method of harmless aluminum ash applied to concrete expanding agent |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210933744.3A CN115180860A (en) | 2022-08-04 | 2022-08-04 | Preparation method of harmless aluminum ash applied to concrete expanding agent |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101333083A (en) * | 2008-08-05 | 2008-12-31 | 中国建筑材料科学研究总院 | High performance expansible cement clinker expansion agent series prepared thereby |
| CN101913790A (en) * | 2010-08-27 | 2010-12-15 | 西南科技大学 | Concrete expansion agent containing circulating fluidized bed combustion coal solid sulfur clinker |
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| CN101333083A (en) * | 2008-08-05 | 2008-12-31 | 中国建筑材料科学研究总院 | High performance expansible cement clinker expansion agent series prepared thereby |
| CN101913790A (en) * | 2010-08-27 | 2010-12-15 | 西南科技大学 | Concrete expansion agent containing circulating fluidized bed combustion coal solid sulfur clinker |
| CN102838308A (en) * | 2012-09-19 | 2012-12-26 | 重庆三圣特种建材股份有限公司 | Expanded clinker as well as expansion agent and preparation method thereof |
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| CN104446081A (en) * | 2014-11-27 | 2015-03-25 | 上海申御特种建材有限公司 | Concrete expansion agent and preparation method thereof |
| CN109912247A (en) * | 2018-11-22 | 2019-06-21 | 湖州丰盛新材料有限公司 | A kind of concrete expansion clinker, swelling agent and preparation method thereof |
| CN113578927A (en) * | 2021-08-03 | 2021-11-02 | 邵冰 | Harmless treatment method for secondary aluminum ash |
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