CN117142778B - Method for preparing magnesium aluminum sulfate cement by using aluminum ash - Google Patents
Method for preparing magnesium aluminum sulfate cement by using aluminum ash Download PDFInfo
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- CN117142778B CN117142778B CN202311415278.0A CN202311415278A CN117142778B CN 117142778 B CN117142778 B CN 117142778B CN 202311415278 A CN202311415278 A CN 202311415278A CN 117142778 B CN117142778 B CN 117142778B
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- magnesium
- aluminum
- gypsum
- cement
- aluminum sulfate
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- 239000004568 cement Substances 0.000 title claims abstract description 103
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 43
- LYUDWCGKBDSWET-UHFFFAOYSA-L aluminum;magnesium;sulfate Chemical compound [Mg+2].[Al+3].[O-]S([O-])(=O)=O LYUDWCGKBDSWET-UHFFFAOYSA-L 0.000 title claims description 98
- 239000000463 material Substances 0.000 claims abstract description 50
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 9
- 239000011777 magnesium Substances 0.000 claims abstract description 9
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 8
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 4
- 150000004645 aluminates Chemical class 0.000 claims abstract description 4
- 229910052602 gypsum Inorganic materials 0.000 claims description 102
- 239000010440 gypsum Substances 0.000 claims description 102
- 239000010703 silicon Substances 0.000 claims description 42
- 229910052710 silicon Inorganic materials 0.000 claims description 42
- 239000001095 magnesium carbonate Substances 0.000 claims description 37
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 37
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 37
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 37
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 35
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 35
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 35
- JWSMTBMIGYJJJM-UHFFFAOYSA-N magnesium;azane Chemical compound N.[Mg+2] JWSMTBMIGYJJJM-UHFFFAOYSA-N 0.000 claims description 32
- 239000011812 mixed powder Substances 0.000 claims description 31
- 238000002156 mixing Methods 0.000 claims description 26
- 238000001354 calcination Methods 0.000 claims description 23
- 238000000227 grinding Methods 0.000 claims description 22
- 239000002243 precursor Substances 0.000 claims description 18
- 229910021487 silica fume Inorganic materials 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 239000002893 slag Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 6
- 239000013535 sea water Substances 0.000 abstract description 25
- -1 aluminum sulfate magnesium aluminate Chemical class 0.000 abstract description 13
- 229910052731 fluorine Inorganic materials 0.000 abstract description 7
- 239000011737 fluorine Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 2
- 239000012267 brine Substances 0.000 abstract description 2
- 238000001879 gelation Methods 0.000 abstract description 2
- 231100000956 nontoxicity Toxicity 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 39
- 230000008569 process Effects 0.000 description 22
- 238000012360 testing method Methods 0.000 description 17
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 16
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 14
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 14
- 238000005303 weighing Methods 0.000 description 14
- 238000002791 soaking Methods 0.000 description 12
- 239000000292 calcium oxide Substances 0.000 description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 9
- 238000007654 immersion Methods 0.000 description 9
- 239000000395 magnesium oxide Substances 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 7
- 235000019341 magnesium sulphate Nutrition 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- 238000000354 decomposition reaction Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000005979 thermal decomposition reaction Methods 0.000 description 6
- GVXIVWJIJSNCJO-UHFFFAOYSA-L aluminum;calcium;sulfate Chemical compound [Al+3].[Ca+2].[O-]S([O-])(=O)=O GVXIVWJIJSNCJO-UHFFFAOYSA-L 0.000 description 5
- 239000001166 ammonium sulphate Substances 0.000 description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000011056 performance test Methods 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- 229910052708 sodium Inorganic materials 0.000 description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 3
- 239000013543 active substance Substances 0.000 description 3
- CAVCGVPGBKGDTG-UHFFFAOYSA-N alumanylidynemethyl(alumanylidynemethylalumanylidenemethylidene)alumane Chemical compound [Al]#C[Al]=C=[Al]C#[Al] CAVCGVPGBKGDTG-UHFFFAOYSA-N 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 241000894007 species Species 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000003440 toxic substance Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B9/00—Magnesium cements or similar cements
- C04B9/20—Manufacture, e.g. preparing the batches
-
- 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
- C04B9/00—Magnesium cements or similar cements
- C04B9/06—Cements containing metal compounds other than magnesium compounds, e.g. compounds of zinc or lead
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method for preparing magnesium aluminate sulfate cement by using aluminum ash. The preparation method disclosed by the invention is simple in preparation process, and the required raw materials are simple and easy to obtain, so that the recycling utilization of the aluminum ash can be realized efficiently. The aluminum sulfate magnesium aluminate cement material prepared by the method of the invention by utilizing aluminum ash has no toxicity and the free fluorine content is lower than 0.0024mg/kg. Meanwhile, the aluminum sulfate magnesium aluminate cement prepared by the method of the invention by utilizing aluminum ash has strong gelation activity, the highest strength can reach 51.37MPa, and the prepared cement material has excellent seawater corrosion resistance, and the loss of the strength of the soaked brine is lower than 2 percent.
Description
Technical Field
The invention belongs to the field of recycling of hazardous wastes, and particularly relates to a method for preparing magnesium aluminum sulfate cement by using aluminum ash.
Background
Aluminum ash is a solid waste produced by aluminum during smelting and processing and metallic aluminum during deep processing, manufacturing and use. A certain amount of aluminum ash is generated during the aluminum production process (e.g., electrolysis, smelting, casting, etc.). The aluminum ash mainly comprises aluminum oxide, silicon oxide, ferric oxide and other components. Meanwhile, in the use and recovery process of aluminum products, a certain amount of aluminum ash is generated due to abrasion, corrosion, conversion and other reasons, and the aluminum ash mainly comprises aluminum powder, aluminum scraps and other components.
The aluminum element and other toxic substances in the aluminum ash can enter the soil through the processes of weathering, hydrolysis and the like, so that the aluminum content in the soil is increased. If plants and crops are exposed to high aluminum content soil for a long period of time, the growth and development of the plants and crops can be significantly affected, and then the crop yield is directly reduced. The aluminum element and other toxic substances in the aluminum ash can also enter the surface or underground water system through rain wash, underground water permeation and other ways, so that the aluminum content in the water is increased, the growth and reproduction of aquatic organisms are inhibited, and the balance of an aquatic ecosystem is destroyed. During stacking, transporting and processing, the aluminum ash can also generate dust, harmful gas and other pollutants, and the air quality is influenced. Dust particles can be inhaled into the lung, so that the human respiratory system is damaged; and the aluminum ash reacts with water to release harmful gases (such as ammonia, methane, nitrogen oxides and the like) which have certain harm to the environment and the human health.
The existing aluminum ash disposal technology mainly comprises the following steps: physical treatment, smelting reduction, chemical leaching, bioleaching, pyrolysis, etc. The existing aluminum ash disposal technology has certain defects, and is mainly characterized by low recovery efficiency, high treatment cost, certain pollution to the environment and the like. The method for preparing the magnesium aluminum sulfate cement by using the aluminum ash can fully utilize the components in the aluminum ash, has short process flow, high recycling degree and no secondary pollution, and widens the recycling way of the aluminum ash.
Disclosure of Invention
The invention aims to: the invention aims to provide a method for preparing magnesium aluminum sulfate cement by using aluminum ash.
The technical scheme is as follows: the invention provides a method for preparing magnesium aluminate sulfate cement by using aluminum ash, which comprises the following steps:
(1) Mixing magnesite, ammonium sulfate and gypsum, and grinding to obtain magnesium ammonium gypsum mixed powder;
(2) Mixing aluminum ash and magnesium ammonium gypsum mixed powder, and uniformly stirring to obtain a magnesium aluminum sulfate precursor;
(3) Calcining the magnesium aluminum sulfate precursor, and cooling to obtain magnesium aluminum sulfate cement coarse material;
(4) Mixing the active silicon, gypsum and coarse materials of the magnesium aluminum sulfate cement, and grinding to obtain the magnesium aluminum sulfate cement.
Further, the mass ratio of the magnesite to the ammonium sulfate to the gypsum in the step (1) is 10-50:15-65:100.
Further, the polishing time in the step (1) is 0.5-5.5 hours.
Further, the mass ratio of the aluminum ash to the magnesium ammonium gypsum mixed powder in the step (2) is 60-120:100.
Further, the calcination time in the step (3) is 0.5-3.5 hours, and the calcination temperature is 450-750 ℃.
Further, the mass ratio of the active silicon, gypsum and magnesium aluminum sulfate cement coarse materials in the step (4) is 2.5-12.5:5-15:100.
Further, the polishing time in the step (4) is 0.5-2.5 hours.
Further, the active silicon in the step (4) is silica fume or blast furnace slag powder.
The invention also provides the magnesium aluminum sulfate cement prepared by the method.
Reaction mechanism: during the calcination process, magnesite, ammonium sulfate, gypsum and aluminum ash are decomposed and react with each other. The mixed gas of carbon dioxide, water vapor, sulfur dioxide and ammonia generated by the thermal decomposition of magnesite, ammonium sulfate and gypsum can not only reduce the thermal decomposition activation energy of substances such as aluminum nitride, aluminum carbide and sodium fluoroaluminate in aluminum ash to promote the rapid decomposition of each component in the aluminum ash, but also induce the interaction of decomposition products and aluminum oxide and elemental aluminum in the aluminum ash with magnesite, ammonium sulfate and gypsum to generate light burned magnesia, magnesium sulfate, aluminum magnesium sulfate, calcium oxide, aluminum calcium sulfate and other active substances to mix and blend cement coarse materials. Mixing active silicon, gypsum and magnesium aluminum sulfate cement coarse materials, and promoting the activities of the active silicon, calcium sulfate, light burned magnesium oxide, magnesium sulfate, aluminum magnesium sulfate, calcium oxide, aluminum calcium sulfate and other substances to be improved and the slight cementation among the materials to form the magnesium aluminum sulfate cement in the grinding process.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable advantages: the preparation method disclosed by the invention is simple in preparation process, and the required raw materials are simple and easy to obtain, so that the recycling utilization of the aluminum ash can be realized efficiently. The aluminum sulfate magnesium aluminate cement material prepared by the method of the invention by utilizing aluminum ash has no toxicity and the free fluorine content is lower than 0.0024mg/kg. Meanwhile, the aluminum sulfate magnesium aluminate cement prepared by the method of the invention by utilizing aluminum ash has strong gelation activity, the highest strength can reach 51.37MPa, and the prepared cement material has excellent seawater corrosion resistance, and the loss of the strength of the soaked brine is lower than 2 percent.
Drawings
FIG. 1 is a flow chart of the processing method of the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
Magnesite: magnesite is mainly derived from Anshan of Liaoning and mainly comprises 44.38% MgO, 51.39% CO 2 、1.61%CaO、0.86%FeO、0.53%Al 2 O 3 And other components (unavoidable impurities and loss on ignition);
aluminum ash: obtained from Xingyi aluminum Co.Ltd, and mainly comprises 65.87% Al 2 O 3 、8.34%Cl、6.74%Na 2 O、5.56%SiO 2 、3.72%MgO、2.46%CaO、2.24%S、1.86%TiO 2 And other components (unavoidable impurities and loss on ignition);
silica fume: silica fume from Shijia Borui building materials Co., ltd, mainly comprising 92.54% SiO 2 、2.87%Al 2 O 3 、1.05%Fe 2 O 3 、1.14%MgO、0.68%CaO、0.52%Na 2 O and other components (unavoidable impurities and loss on ignition);
blast furnace slag powder: the blast furnace slag powder is from Lei Yun mineral product processing plant in Lingshu county and mainly comprises 41.19% CaO and 38.26% SiO 2 、8.94%Al 2 O 3 、5.06%MgO、3.21%TiO 2 、2.15%SO 3 And other components (loss on ignition and other unavoidable impurities);
gypsum: gypsum is available from shandong bang gypsum products limited, brand: long Bang, pH is 7-8, and specification is 200-600 mesh.
EXAMPLE 1 influence of the mass ratio of magnesite, ammonium sulfate and gypsum on the Performance of the prepared magnesium aluminum sulfate cement
And respectively weighing magnesite, ammonium sulfate and gypsum according to the mass ratio of 2.5:15:100, 5:15:100, 7.5:15:100, 10:7.5:100, 10:10:100, 10:12.5:100, 10:15:100, 30:15:100, 50:15:100, 10:40:100, 30:40:100, 50:40:100, 10:65:100, 30:65:100, 50:70:100, 50:75:100, 50:80:100, 55:65:100, 60:65:100 and 65:65:100, and grinding for 0.5 hour to obtain magnesium ammonium gypsum mixed powder. Respectively weighing aluminum ash and magnesium ammonium gypsum mixed powder according to the mass ratio of 60:100, mixing and stirring uniformly to obtain the magnesium aluminum sulfate precursor. Calcining the magnesium aluminum sulfate precursor for 0.5 hour, wherein the calcining temperature is 450 ℃, and cooling to obtain the magnesium aluminum sulfate cement coarse material. Mixing active silicon, gypsum and magnesium aluminum sulfate cement coarse material according to the mass ratio of 2.5:5:100, and grinding for 0.5 hour to obtain the magnesium aluminum sulfate cement, wherein the active silicon is silica fume.
Strength performance test: the magnesium aluminum sulfate cement prepared by the method is prepared into tested rubber sand, the rubber sand is prepared, a test piece is prepared, the test piece is maintained, the test piece age is selected, and the test piece has 28-day compressive strength (P 28 MPa) are all carried out according to the standard of the cement mortar strength test method (ISO method) GB/T17671-1999. The test piece is prepared by adopting ISO standard sand specified in the method for testing cement mortar strength (ISO method) GB/T17671-1999.
Determination of fluorine ions of the magnesium aluminum sulfate cement: determination of fluoride ions in magnesium aluminum sulfate cement determination was performed according to the method of Cement chemistry analysis GB/T176-2017.
Seawater soaking and strength loss calculation: the 28-day-age test piece is fully soaked in the seawater for 30 days, the test piece is taken out for strength test, and the loss of the seawater soaking strength is equal to the difference of the strength of the non-soaked 28-day-age test piece minus the strength of the soaked test piece divided by the percentage of the strength of the non-soaked 28-day-age test piece. The test results of this example are shown in Table 1.
TABLE 1 influence of the mass ratio of magnesite, ammonium sulfate and gypsum on the properties of the prepared magnesium aluminum sulfate cement
| Magnesite, ammonium sulfate and gypsum mass ratio | Uniaxial compressive Strength (MPa) | Fluoride ion content (mg/kg) | Loss of seawater immersion strength |
| 2.5:15:100 | 20.58 | 0.181 | 11.47% |
| 5:15:100 | 24.35 | 0.156 | 10.79% |
| 7.5:15:100 | 30.96 | 0.143 | 8.84% |
| 10:7.5:100 | 19.87 | 0.168 | 10.98% |
| 10:10:100 | 26.13 | 0.154 | 10.11% |
| 10:12.5:100 | 32.44 | 0.137 | 9.75% |
| 10:15:100 | 41.75 | 0.046 | 6.61% |
| 30:15:100 | 42.08 | 0.032 | 6.34% |
| 50:15:100 | 43.17 | 0.027 | 5.12% |
| 10:40:100 | 42.62 | 0.035 | 5.67% |
| 30:40:100 | 43.78 | 0.024 | 5.26% |
| 50:40:100 | 45.46 | 0.019 | 4.89% |
| 10:65:100 | 43.85 | 0.026 | 5.04% |
| 30:65:100 | 45.26 | 0.021 | 4.63% |
| 50:65:100 | 46.89 | 0.013 | 4.37% |
| 50:70:100 | 39.27 | 0.053 | 7.02% |
| 50:75:100 | 37.83 | 0.081 | 7.69% |
| 50:80:100 | 35.66 | 0.092 | 8.75% |
| 55:65:100 | 40.25 | 0.068 | 6.89% |
| 60:65:100 | 36.68 | 0.075 | 7.36% |
| 65:65:100 | 34.58 | 0.086 | 8.17% |
As can be seen from table 1, when the mass ratio of magnesite, ammonium sulfate and gypsum is less than 10:15:100 (as in table 1, the mass ratio of magnesite, ammonium sulfate and gypsum=7.5:15:100, 5:15:100, 2.5:15:100, 10:12.5:100, 10:10:100, 10:7.5:100 and lower ratios not listed in table 1), less magnesite and ammonium sulfate are added, the reaction between the components of the magnesium ammonium gypsum mixed powder is insufficient during calcination, resulting in a significant decrease in uniaxial compressive strength of the prepared magnesium aluminum sulfate cement with decreasing mass ratio of magnesite, ammonium sulfate and gypsum, and a significant increase in fluoride ion content and loss in seawater immersion strength with decreasing mass ratio of magnesite, ammonium sulfate and gypsum. When the mass ratio of magnesite, ammonium sulfate and gypsum is equal to 10-50:15-65:100 (as in table 1, the mass ratio of magnesite, ammonium sulfate and gypsum=10:15:100, 30:15:100, 50:15:100, 10:40:100, 30:40:100, 50:40:100, 10:65:100, 30:65:100, 50:65:100), during the calcination process, the magnesite, ammonium sulfate, gypsum and aluminum ash all decompose and react with each other. The mixed gas of carbon dioxide, water vapor, sulfur dioxide and ammonia generated by the thermal decomposition of magnesite, ammonium sulfate and gypsum can not only reduce the thermal decomposition activation energy of substances such as aluminum nitride, aluminum carbide and sodium fluoroaluminate in aluminum ash to promote the rapid decomposition of each component in the aluminum ash, but also induce the interaction of decomposition products and aluminum oxide and elemental aluminum in the aluminum ash with magnesite, ammonium sulfate and gypsum to generate light burned magnesia, magnesium sulfate, aluminum magnesium sulfate, calcium oxide, aluminum calcium sulfate and other active substances to mix and blend cement coarse materials. Finally, the uniaxial compressive strength of the prepared magnesium aluminum sulfate cement is higher than 41MPa, the fluorine ion content is lower than 0.05mg/kg, and the seawater soaking strength loss is lower than 6.7%. When the mass ratio of magnesite, ammonium sulphate and gypsum is greater than 50:65:100 (as in table 1, the mass ratio of magnesite, ammonium sulphate and gypsum=50:70:100, 50:75:100, 50:80:100, 55:65:100, 60:65:100, 65:65:100 and higher ratios not listed in table 1), the magnesite and ammonium sulphate are added in excess, such that the reaction between the materials in the calcination process is unbalanced, resulting in a significant decrease in uniaxial compressive strength of the prepared magnesium aluminate cement as the mass ratio of magnesite, ammonium sulphate and gypsum is further increased, while the fluoride ion content and the loss in seawater immersion strength are significantly increased as the mass ratio of magnesite, ammonium sulphate and gypsum is further increased.
Therefore, in general, when the mass ratio of magnesite, ammonium sulfate and gypsum is equal to 10-50:15-65:100, the benefits and the cost are combined, and the performance of the prepared magnesium aluminum sulfate cement is improved most favorably.
Example 2 influence of the mass ratio of the aluminum ash and the magnesium ammonium gypsum Mixed powder on the properties of the prepared magnesium aluminum sulfate cement
Respectively weighing magnesite, ammonium sulfate and gypsum according to the mass ratio of 50:65:100, mixing, and grinding for 3 hours to obtain magnesium ammonium gypsum mixed powder. Respectively weighing aluminum ash and magnesium ammonium gypsum mixed powder according to the mass ratio of 45:100, 50:100, 55:100, 60:100, 90:100, 120:100, 125:100, 130:100 and 135:100, mixing, and stirring uniformly to obtain the aluminum sulfate magnesium aluminate precursor. Calcining the magnesium aluminum sulfate precursor for 2 hours at the calcining temperature of 600 ℃, and cooling to obtain the magnesium aluminum sulfate cement coarse material. Mixing active silicon, gypsum and magnesium aluminum sulfate cement coarse materials according to a mass ratio of 7.5:10:100, and grinding for 1.5 hours to obtain the magnesium aluminum sulfate cement, wherein the active silicon is blast furnace slag powder.
The strength performance test, the determination of fluorine ions of the magnesium aluminum sulfate cement, the seawater soaking and the calculation of the strength loss are all the same as those of the example 1, and the test result of the example is shown as 2.
TABLE 2 influence of the mass ratio of aluminum ash to magnesium ammonium gypsum powder mixture on the performance of the prepared magnesium aluminum sulfate cement
| Aluminum ash and magnesium ammonium gypsum mixed powder mass ratio | Uniaxial compressive Strength (MPa) | Fluoride ion content (mg/kg) | Loss of seawater immersion strength |
| 45:100 | 31.64 | 0.093 | 8.82% |
| 50:100 | 34.67 | 0.074 | 8.14% |
| 55:100 | 39.75 | 0.036 | 6.93% |
| 60:100 | 46.94 | 0.012 | 4.26% |
| 90:100 | 47.59 | 0.0093 | 3.65% |
| 120:100 | 48.46 | 0.0067 | 3.04% |
| 125:100 | 43.28 | 0.026 | 5.48% |
| 130:100 | 40.39 | 0.031 | 6.47% |
| 135:100 | 36.14 | 0.042 | 7.39% |
As can be seen from table 2, when the mass ratio of the aluminum ash to the magnesium ammonium gypsum mixed powder is less than 60:100 (as in table 2, when the mass ratio of the aluminum ash to the magnesium ammonium gypsum mixed powder=55:100, 50:100, 45:100 and lower ratio not listed in table 2), the aluminum ash is added less, the reaction between the components of the aluminum ash and the magnesium ammonium gypsum mixed powder during the calcination process is insufficient, resulting in that the uniaxial compressive strength of the prepared magnesium aluminum sulfate cement is significantly reduced as the mass ratio of the aluminum ash to the magnesium ammonium gypsum mixed powder is reduced, and the fluoride ion content and the seawater soaking strength loss are significantly improved as the mass ratio of the aluminum ash to the magnesium ammonium gypsum mixed powder is reduced. When the mass ratio of the aluminum ash to the magnesium ammonium gypsum mixed powder is equal to 60-120:100 (as in table 2, the mass ratio of the aluminum ash to the magnesium ammonium gypsum mixed powder=60:100, 90:100, 120:100), in the calcining process, the magnesite, the ammonium sulfate, the gypsum and the aluminum ash are all decomposed and react with each other. The mixed gas of carbon dioxide, water vapor, sulfur dioxide and ammonia generated by the thermal decomposition of magnesite, ammonium sulfate and gypsum can not only reduce the thermal decomposition activation energy of substances such as aluminum nitride, aluminum carbide and sodium fluoroaluminate in aluminum ash to promote the rapid decomposition of each component in the aluminum ash, but also induce the interaction of decomposition products and aluminum oxide and elemental aluminum in the aluminum ash with magnesite, ammonium sulfate and gypsum to generate light burned magnesia, magnesium sulfate, aluminum magnesium sulfate, calcium oxide, aluminum calcium sulfate and other active substances to mix and blend cement coarse materials. Finally, the uniaxial compressive strength of the prepared magnesium aluminum sulfate cement is higher than 46MPa, the fluorine ion content is lower than 0.02mg/kg, and the seawater soaking strength loss is lower than 4.3%. When the aluminum ash and magnesium ammonium gypsum mix mass ratio is greater than 120:100 (as in table 2, aluminum ash and magnesium ammonium gypsum mix mass ratio = 125:100, 130:100, 135:100 and higher ratios not listed in table 2), the aluminum ash is added in excess, such that the reaction between the materials during calcination is unbalanced, resulting in a significant decrease in uniaxial compressive strength of the prepared sulfur aluminum magnesium salt cement as the aluminum ash and magnesium ammonium gypsum mix mass ratio is further increased, while the fluoride ion content and seawater immersion strength loss are significantly increased as the aluminum ash and magnesium ammonium gypsum mix mass ratio is further increased.
Therefore, in general, the benefits and the cost are combined, and when the mass ratio of the aluminum ash to the magnesium ammonium gypsum mixed powder is equal to 60-120:100, the performance of the prepared magnesium aluminum sulfate cement is improved most favorably.
EXAMPLE 3 influence of the mass ratio of active silica, gypsum, and magnesium sulfate Cement coarse Material on the prepared magnesium sulfate Cement Performance
Respectively weighing magnesite, ammonium sulfate and gypsum according to the mass ratio of 50:65:100, mixing, and grinding for 5.5 hours to obtain magnesium ammonium gypsum mixed powder. Respectively weighing aluminum ash and magnesium ammonium gypsum mixed powder according to the mass ratio of 120:100, mixing and stirring uniformly to obtain the magnesium aluminum sulfate precursor. Calcining the magnesium aluminum sulfate precursor for 3.5 hours at 750 ℃, and cooling to obtain the magnesium aluminum sulfate cement coarse material. Active silicon, gypsum and magnesium aluminum sulfate cement coarse materials are mixed according to the mass ratio of 1:5:100, 1.5:5:100, 2:5:100, 2.5:2.5:100, 2.5:3:100, 2.5:4:100, 2.5:5:100, 7.5:5:100, 12.5:5:100, 2.5:10:100, 7.5:10:100, 12.5:10:100, 2.5:15:100, 7.5:15:100, 12.5:15:100, 12.5:16:100, 12.5:17:100, 12.5:17.5:100, 13.5:15:100, 14.5:15:100 and 15:15:100, and the coarse materials are ground for 2.5 hours, so that the magnesium aluminum sulfate cement is obtained, wherein the active silicon is silica fume.
The strength performance test, the determination of fluorine ions of the magnesium aluminum sulfate cement, the seawater soaking and the calculation of the strength loss are all the same as those of the example 1, and the test result of the example is shown as 3.
TABLE 3 influence of the mass ratio of active silica, gypsum and magnesium aluminum sulfate cement coarse materials on the performance of the prepared magnesium aluminum sulfate cement
| Active silicon, gypsum, magnesium aluminum sulfate cement coarse material mass ratio | Uniaxial compressive Strength (MPa) | Fluoride ion content (mg/kg) | Loss of seawater immersion strength |
| 1:5:100 | 36.75 | 0.036 | 6.43% |
| 1.5:5:100 | 39.14 | 0.031 | 6.11% |
| 2:5:100 | 42.59 | 0.013 | 5.27% |
| 2.5:2.5:100 | 38.92 | 0.034 | 6.09% |
| 2.5:3:100 | 40.42 | 0.025 | 5.23% |
| 2.5:4:100 | 43.56 | 0.0098 | 4.58% |
| 2.5:5:100 | 48.25 | 0.0058 | 2.96% |
| 7.5:5:100 | 49.14 | 0.0049 | 2.57% |
| 12.5:5:100 | 49.68 | 0.0036 | 2.32% |
| 2.5:10:100 | 49.02 | 0.0042 | 2.78% |
| 7.5:10:100 | 50.36 | 0.0035 | 2.54% |
| 12.5:10:100 | 50.79 | 0.0031 | 2.26% |
| 2.5:15:100 | 50.58 | 0.0037 | 2.14% |
| 7.5:15:100 | 51.05 | 0.0029 | 2.03% |
| 12.5:15:100 | 51.37 | 0.0024 | 1.89% |
| 12.5:16:100 | 47.28 | 0.0076 | 3.46% |
| 12.5:17:100 | 44.15 | 0.0092 | 3.95% |
| 12.5:17.5:100 | 42.65 | 0.012 | 4.69% |
| 13.5:15:100 | 46.39 | 0.0083 | 4.11% |
| 14.5:15:100 | 44.26 | 0.011 | 4.26% |
| 15:15:100 | 43.75 | 0.014 | 4.72% |
As can be seen from table 3, when the mass ratio of active silicon, gypsum, and magnesium aluminum sulfate cement coarse materials is less than 2.5:5:100 (as in table 3, the mass ratio of active silicon, gypsum, magnesium aluminum sulfate cement coarse materials=2:5:100, 1.5:5:100, 1:5:100, 2.5:4:100, 2.5:3:100, 2.5:2.5:100, and lower ratios not listed in table 3), the active silicon and gypsum additions are less, the activity of each material during grinding is improved and the cementing reaction is insufficient, resulting in a significant decrease in uniaxial compressive strength of the prepared magnesium aluminum sulfate cement as the mass ratio of active silicon, gypsum, magnesium aluminum sulfate cement coarse materials is decreased, and the fluoride ion content and the seawater immersion strength loss are significantly improved as the mass ratio of active silicon, gypsum, magnesium aluminum sulfate cement coarse materials is decreased. When the mass ratio of the active silicon, the gypsum and the magnesium aluminum sulfate cement coarse materials is equal to 2.5-12.5:5-15:100 (as shown in table 3, the mass ratio of the active silicon, the gypsum and the magnesium aluminum sulfate cement coarse materials=2.5:5:100, 7.5:5:100, 12.5:5:100, 2.5:10:100, 7.5:10:100, 12.5:10:100, 2.5:15:100, 7.5:15:100, 12.5:15:100), the active silicon, the gypsum and the magnesium aluminum sulfate cement coarse materials are mixed, and the active silicon, the calcium sulfate and the light burned magnesium oxide, the magnesium sulfate, the aluminum magnesium sulfate, the calcium oxide, the aluminum calcium sulfate and other substances are promoted by the mechanochemical action in the grinding process, so that the light cementing between the materials is promoted, and the magnesium aluminum sulfate cement is formed. Finally, the uniaxial compressive strength of the prepared magnesium aluminum sulfate cement is higher than 48MPa, the fluorine ion content is lower than 0.006mg/kg, and the seawater soaking strength loss is lower than 3%. When the active silicon, gypsum, magnesium aluminum sulfate cement coarse material mass ratio is greater than 12.5:15:100 (as in table 3, active silicon, gypsum, magnesium aluminum sulfate cement coarse material mass ratio = 12.5:16:100, 12.5:17:100, 12.5:17.5:100, 13.5:15:100, 14.5:15:100, 15:15:100, and higher ratios not listed in table 3), the active silicon and gypsum are added in excess, such that the inter-material reaction is imbalanced, resulting in a significant decrease in uniaxial compressive strength of the prepared magnesium aluminum sulfate cement as the active silicon, gypsum, magnesium aluminum sulfate cement coarse material mass ratio is further increased, while the fluoride ion content and seawater soak strength loss are significantly increased as the active silicon, gypsum, magnesium aluminum sulfate cement coarse material mass ratio is further increased.
Therefore, in general, the benefits and the cost are combined, and when the mass ratio of the active silicon to the gypsum to the magnesium aluminum sulfate cement coarse materials is equal to 2.5-12.5:5-15:100, the performance of the prepared magnesium aluminum sulfate cement is improved most favorably.
EXAMPLE 4 Effect of reactive silicon species on the Properties of the prepared magnesium aluminum sulfate cement
Respectively weighing magnesite, ammonium sulfate and gypsum according to the mass ratio of 50:65:100, mixing, and grinding for 5.5 hours to obtain magnesium ammonium gypsum mixed powder. Respectively weighing aluminum ash and magnesium ammonium gypsum mixed powder according to the mass ratio of 120:100, mixing and stirring uniformly to obtain the magnesium aluminum sulfate precursor. Calcining the magnesium aluminum sulfate precursor for 3.5 hours at 750 ℃, and cooling to obtain the magnesium aluminum sulfate cement coarse material. Mixing active silicon, gypsum and magnesium aluminum sulfate cement coarse materials according to a mass ratio of 12.5:15:100, and grinding for 2.5 hours to obtain the magnesium aluminum sulfate cement, wherein the active silicon is any one of silica fume or blast furnace slag.
The strength performance test, the determination of fluorine ions of the magnesium aluminum sulfate cement, the seawater soaking and the calculation of the strength loss are all the same as those of the example 1, and the test result of the example is shown as 4.
TABLE 4 influence of active silicon species on the Performance of the prepared magnesium aluminum sulfate cements
| Reactive silicon species | Uniaxial compressive Strength (MPa) | Fluoride ion content (mg/kg) | Loss of seawater immersion strength |
| Silica fume | 51.37 | 0.0024 | 1.89% |
| Blast furnace slag | 49.56 | 0.0025 | 1.92% |
As is clear from Table 4, when the active silicon is any one of silica fume and blast furnace slag, the uniaxial compressive strength, chloride ion content and seawater soaking strength losses of the prepared magnesium aluminum sulfate cement are all relatively close.
Comparative examples comparison of the Performance of the magnesium aluminum sulfate cements prepared by different comparative processes
The process comprises the following steps: respectively weighing magnesite, ammonium sulfate and gypsum according to the mass ratio of 50:65:100, mixing, and grinding for 5.5 hours to obtain magnesium ammonium gypsum mixed powder. Respectively weighing aluminum ash and magnesium ammonium gypsum mixed powder according to the mass ratio of 120:100, mixing and stirring uniformly to obtain the magnesium aluminum sulfate precursor. Calcining the magnesium aluminum sulfate precursor for 3.5 hours at 750 ℃, and cooling to obtain the magnesium aluminum sulfate cement coarse material. Mixing active silicon, gypsum and magnesium aluminum sulfate cement coarse material according to a mass ratio of 12.5:15:100, and grinding for 2.5 hours to obtain the magnesium aluminum sulfate cement, wherein the active silicon is silica fume.
Comparison Process 1: respectively weighing magnesite and gypsum according to the mass ratio of 50:100, mixing, and grinding for 5.5 hours to obtain the magnesium-doped gypsum mixed powder. Respectively weighing aluminum ash and magnesium-doped gypsum mixed powder according to the mass ratio of 120:100, mixing and stirring uniformly to obtain the magnesium aluminum sulfate precursor. Calcining the magnesium aluminum sulfate precursor for 3.5 hours at 750 ℃, and cooling to obtain the magnesium aluminum sulfate cement coarse material. Mixing active silicon, gypsum and magnesium aluminum sulfate cement coarse material according to a mass ratio of 12.5:15:100, and grinding for 2.5 hours to obtain the magnesium aluminum sulfate cement, wherein the active silicon is silica fume.
Comparison process 2: and respectively weighing ammonium sulfate and gypsum according to the mass ratio of 65:100, mixing, and grinding for 5.5 hours to obtain ammonium-doped gypsum mixed powder. Respectively weighing aluminum ash and ammonium gypsum mixed powder according to the mass ratio of 120:100, mixing and stirring uniformly to obtain the sulphoaluminate precursor. Calcining the sulphoaluminate precursor for 3.5 hours, wherein the calcining temperature is 750 ℃, and cooling to obtain the sulphoaluminate cement coarse material. Mixing active silicon, gypsum and sulphoaluminate cement coarse material according to a mass ratio of 12.5:15:100, and grinding for 2.5 hours to obtain the sulphoaluminate magnesium cement, wherein the active silicon is silica fume.
The strength performance test, the determination of fluorine ions of the magnesium aluminum sulfate cement, the seawater soaking and the calculation of the strength loss are all the same as those of the example 1, and the test result of the example is shown as 5.
TABLE 5 comparison of the Performance of the magnesium aluminum sulfate cements prepared by different comparative processes
| Type of process | Uniaxial compressive Strength (MPa) | Fluoride ion content (mg/kg) | Loss of seawater immersion strength |
| The process of the invention | 51.37 | 0.0024 | 1.89% |
| Comparative Process 1 | 22.41 | 0.51 | 8.75% |
| Comparative Process 2 | 24.75 | 0.72 | 11.96% |
As can be seen from Table 5, the uniaxial compressive strength of the sulphoaluminate magnesium cement prepared by the process of the invention is obviously higher than that of the sulphoaluminate magnesium cement prepared by the process of the invention in comparison with the process 1 and the process 2, and the loss of chloride ion content and seawater soaking strength of the sulphoaluminate cement prepared by the process of the invention is obviously lower than those of the sulphoaluminate magnesium cement prepared by the process of the invention in comparison with the process 1 and the process 2.
Claims (4)
1. A method for preparing magnesium aluminum sulfate cement by using aluminum ash, which is characterized by comprising the following steps:
(1) Mixing magnesite, ammonium sulfate and gypsum, and grinding to obtain magnesium ammonium gypsum mixed powder;
the mass ratio of the magnesite to the ammonium sulfate to the gypsum is 10-50:15-65:100;
(2) Mixing aluminum ash and magnesium ammonium gypsum mixed powder, and uniformly stirring to obtain a magnesium aluminum sulfate precursor;
the mass ratio of the aluminum ash to the magnesium ammonium gypsum mixed powder is 60-120:100;
(3) Calcining the magnesium aluminum sulfate precursor, and cooling to obtain magnesium aluminum sulfate cement coarse material;
the calcination time is 0.5-3.5 hours, and the calcination temperature is 450-750 ℃;
(4) Mixing active silicon, gypsum and coarse materials of the magnesium aluminum sulfate cement, and grinding to obtain the magnesium aluminum sulfate cement;
the mass ratio of the active silicon to the gypsum to the magnesium aluminum sulfate cement coarse material is 2.5-12.5:5-15:100;
the active silicon is silica fume or blast furnace slag powder.
2. The method for preparing magnesium aluminate sulfate cement by using aluminum ash according to claim 1, wherein the grinding time in the step (1) is 0.5-5.5 hours.
3. The method for preparing magnesium aluminate sulfate cement by using aluminum ash according to claim 1, wherein the grinding time in the step (4) is 0.5-2.5 hours.
4. A magnesium aluminum sulfate cement prepared by the method of any one of claims 1 to 3.
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| CN112978762A (en) * | 2021-04-16 | 2021-06-18 | 齐鲁工业大学 | System and method for preparing magnesium aluminate spinel and co-producing ammonium sulfate |
| CN115572085A (en) * | 2022-11-03 | 2023-01-06 | 常熟理工学院 | Preparation method of sulphate aluminium magnesium salt cement and product thereof |
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| CN112978762A (en) * | 2021-04-16 | 2021-06-18 | 齐鲁工业大学 | System and method for preparing magnesium aluminate spinel and co-producing ammonium sulfate |
| CN115572085A (en) * | 2022-11-03 | 2023-01-06 | 常熟理工学院 | Preparation method of sulphate aluminium magnesium salt cement and product thereof |
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