CN114409283A - Alite-ylimide cement and preparation method thereof - Google Patents
Alite-ylimide cement and preparation method thereof Download PDFInfo
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- CN114409283A CN114409283A CN202111609054.4A CN202111609054A CN114409283A CN 114409283 A CN114409283 A CN 114409283A CN 202111609054 A CN202111609054 A CN 202111609054A CN 114409283 A CN114409283 A CN 114409283A
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- alite
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- ylimide
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- 239000004568 cement Substances 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052802 copper Inorganic materials 0.000 claims abstract description 14
- 239000010949 copper Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000010440 gypsum Substances 0.000 claims abstract description 12
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000010881 fly ash Substances 0.000 claims abstract description 11
- 235000019738 Limestone Nutrition 0.000 claims abstract description 10
- 239000006028 limestone Substances 0.000 claims abstract description 10
- 238000005245 sintering Methods 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 5
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 10
- 239000011574 phosphorus Substances 0.000 claims description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims description 10
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 3
- -1 sandstone Substances 0.000 claims description 3
- 230000004580 weight loss Effects 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims 1
- 239000004567 concrete Substances 0.000 claims 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 29
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 10
- 235000011941 Tilia x europaea Nutrition 0.000 description 10
- 239000004571 lime Substances 0.000 description 10
- 239000012071 phase Substances 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 102100035709 Acetyl-coenzyme A synthetase, cytoplasmic Human genes 0.000 description 3
- 101000783232 Homo sapiens Acetyl-coenzyme A synthetase, cytoplasmic Proteins 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- 235000012241 calcium silicate Nutrition 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000011534 incubation Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- VVIAGPKUTFNRDU-STQMWFEESA-N (6S)-5-formyltetrahydrofolic acid Chemical compound C([C@H]1CNC=2N=C(NC(=O)C=2N1C=O)N)NC1=CC=C(C(=O)N[C@@H](CCC(O)=O)C(O)=O)C=C1 VVIAGPKUTFNRDU-STQMWFEESA-N 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 102100033772 Complement C4-A Human genes 0.000 description 1
- 239000005789 Folpet Substances 0.000 description 1
- 101000710884 Homo sapiens Complement C4-A Proteins 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 229940099898 chlorophyllin Drugs 0.000 description 1
- 235000019805 chlorophyllin Nutrition 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical group [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- HKIOYBQGHSTUDB-UHFFFAOYSA-N folpet Chemical compound C1=CC=C2C(=O)N(SC(Cl)(Cl)Cl)C(=O)C2=C1 HKIOYBQGHSTUDB-UHFFFAOYSA-N 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Images
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
- C04B7/00—Hydraulic cements
- C04B7/345—Hydraulic cements not provided for in one of the groups C04B7/02 - C04B7/34
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an alite-ylimide cement and a preparation method thereof, and the alite-ylimide cement comprises the following components: limestone; 70-72 wt.%, sandstone: 6.5-7.5 wt.%, fly ash: 6.8-7.0 wt.%, gypsum: 9.2-9.4 wt.%, copper slag: 1.4-1.6 wt.%, phosphorous slag: 2.2-2.4 wt.%, alumina: 0.7-0.9 wt.%, silica: 1.1-1.3 wt.%, the method for preparing alite-ylimide cement comprising mixing the raw materials together for a certain time, pressing the homogenized mixture with water into a mixture in the shape of a parallel epitaxial wafer and sintering the mixture at different time intervals at different temperatures of 1200 ℃ to 1350 ℃, and during sintering, taking out samples at different holding times of 0h, 0.5h, 1h, 1.5h and 2h, respectively.
Description
Technical Field
The invention relates to the technical field of cement, in particular to alite-ylimide cement and a preparation method thereof.
Background
Alite-ylimide cement mainly contains aluminum oxide, calcium oxide, aluminum oxide and minerals, and has been synthesized in recent decades, and the cement has the performance of both portland cement and CSA cement. In addition, alite-ylimide cement is expected to be a promising low-energy cement due to its lower synthesis temperature, easy grinding performance and the potential to reconstitute more solid waste.
A change in formation of alite and folpet, which may coexist at high temperature. However, the reaction kinetics during clinker firing do not match, since alite is mainly formed in portland cement clinker at around 1450 ℃ and pure-phase alite is rapidly decomposed after 1350 ℃, so in order to improve clinker quality, several tens of experimental works have been carried out to extend their coexisting temperature range, which can be summarized as (a) improving the thermal stability of clinker at high temperatures. Barium or strontium is combined into a rare earth solid solution in the following way, and the temperature of the ylimide is stabilized at 1380 ℃; (b) lowering the formation temperature of alite by modifying the properties of the liquid phase at high temperatures by mineralizers, (c) modifying the chemical process by means of a secondary heat treatment of portland clinker, which, although satisfactory cement clinker is obtained in the laboratory, is complicated to prepare cement clinker cements.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above and/or the problems associated with the relatively complicated processes for the preparation of existing cement clinker cements.
Therefore, it is an object of the present invention to provide an alite-ylimide cement and a method for preparing the same, which effectively simplify the preparation process of cement clinker cement.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:
an alite-ylimide cement, which comprises the following components in percentage by weight:
limestone: 70-72 wt.%;
sandstone: 6.5-7.5 wt.%;
fly ash: 6.8-7.0 wt.%;
gypsum: 9.2-9.4 wt.%;
copper slag: 1.4-1.6 wt.%;
phosphorus slag: 2.2-2.4 wt.%;
alumina: 0.7-0.9 wt.%;
silicon oxide: 1.1-1.3 wt.%.
As a preferred scheme of the alite-ylimide cement, the alite-ylimide cement comprises the following components in percentage by weight:
limestone: 71 wt.%;
sandstone: 7 wt.%;
fly ash: 6.9 wt.%;
gypsum: 9.3 wt.%;
copper slag: 1.5 wt.%;
phosphorus slag: 2.3 wt.%;
alumina: 0.8 wt.%;
silicon oxide: 1.2 wt.%.
As a preferable aspect of an alite-ylimide cement according to the present invention, wherein the weight loss of the limestone, sandstone, fly ash, gypsum, copper slag, phosphorous slag, alumina and silica is obtained by ignition at 1000 ℃ to constant weight.
A preparation method of alite-ylimide cement comprises the following specific steps:
s1, mixing the raw materials of the alite-ylimide cement together for a certain time;
s2, pressing the homogenized mixture into a mixture in the shape of a parallel epitaxial wafer by using water;
and S3, sintering the mixture at different temperatures ranging from 1200 ℃ to 1350 ℃ at different time intervals, and taking out samples at different heat preservation times of 0h, 0.5h, 1h, 1.5h and 2h respectively in the sintering process.
As a preferable embodiment of the method for preparing alite-ylimide cement according to the present invention, the volume of the parallel epitaxial wafer is: 20mm by 5 mm.
As a preferable embodiment of the process for producing alite-ylimide cement according to the invention, the mixture is sintered in an electric resistance furnace
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the alite-ylimide cement is synthesized by adding the phosphorus slag and the copper slag and adopting a low-temperature single firing process, so that alite is formed in the cement clinker at about 1300 ℃, the formation temperature of alite is reduced, the alite and the ylimide can coexist at low temperature, no mineralizer is required to be added or a secondary heat treatment method of the clinker is not required to be changed, and the preparation process of the cement clinker is effectively simplified.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail with reference to the accompanying drawings and detailed embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise. Wherein:
FIG. 1 is a contour plot of the alite content versus time and temperature for an alite-ylimide cement of the invention;
FIG. 2 is a contour plot of the Folite content versus time and temperature for an alite-Folimet cement of the present invention;
FIG. 3 is a contour plot of the lime-free content of an alite-ylimide cement versus time and temperature in accordance with the present invention;
FIG. 4 is a bse backscatter image of clinker synthesized at 1250 ℃ by an alite-ylimide cement of the invention;
FIG. 5 is a bse backscatter image of clinker synthesized at 1275 ℃ by an alite-ylimide cement of the invention;
FIG. 6 is a bse backscatter image of clinker synthesized at 1300 ℃ by an alite-ylimide cement of the invention;
FIG. 7 is a bse backscatter image of clinker synthesized at 1350 ℃ with an alite-ylimide cement of the invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Next, the present invention will be described in detail with reference to the drawings, wherein for convenience of illustration, the cross-sectional view of the device structure is not enlarged partially according to the general scale, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The invention provides an alite-ylimide cement and a preparation method thereof, which effectively simplify the preparation process of cement clinker cement.
The alite-ylimide cement comprises the following components in percentage by weight: 70-72 wt.%; sandstone: 6.5-7.5 wt.%; fly ash: 6.8-7.0 wt.%; gypsum: 9.2-9.4 wt.%; copper slag: 1.4-1.6 wt.%; phosphorus slag: 2.2-2.4 wt.%; alumina: 0.7-0.9 wt.% and silica: 1.1-1.3 wt.%, specifically, by weight percent, comprising: limestone: 71 wt.%; sandstone: 7 wt.%; fly ash: 6.9 wt.%; gypsum: 9.3 wt.%; copper slag: 1.5 wt.%; phosphorus slag: 2.3 wt.%; alumina: 0.8 wt.%; silicon oxide: 1.2 wt.%. The weight loss of the above limestone, sandstone, fly ash, gypsum, copper slag, phosphorous slag, alumina and silica is obtained by ignition at 1000 ℃ to constant weight.
The preparation method of the alite-ylimide cement comprises the following steps:
and S1, mixing the raw materials together for a certain time.
S2, pressing the homogenized mixture into a mixture in the shape of a parallel epitaxial wafer by using water, wherein the volume of the parallel epitaxial wafer is as follows: 20mm by 5 mm.
And S3, sintering the mixture in a resistance furnace at different temperatures ranging from 1200 ℃ to 1350 ℃ at different time intervals, and taking out samples at different heat preservation times of 0h, 0.5h, 1h, 1.5h and 2h respectively in the sintering process.
The following are in limestone: 71 wt.%; sandstone: 7 wt.%; fly ash: 6.9 wt.%; gypsum: 9.3 wt.%; copper slag: 1.5 wt.%; phosphorus slag: 2.3 wt.%; alumina: 0.8 wt.%; silicon oxide: 1.2 wt.% of the raw materials is sintered by the method, and the sample is taken out for testing during the sintering process.
Contour plots of the alite, folinate and free lime content as a function of time and temperature are shown in figures 1-3.
At 1200C, C2S was mostly synthesized with more than 60 wt%. The ylimide phase content is about 7.5% by weight, the duration being from 0 to 120 minutes. After 30 minutes of hold, C3S appeared at 1225 ℃ with a content of less than 7 wt%. as Eq increased, the free lime began to decrease gradually. At 1250 degrees celsius (fig. S4(C)), alite is produced in large quantities and folinate begins to decompose into C3A and anhydrite. However, since there is little liquid phase, the diffusion of free lime is limited, resulting in small nuclei of the irregularly contoured alite. This will be discussed in a later section. As C3S increased, f-MgO dissolved into the clinker phase and disappeared as the temperature reached 1275 ℃ with retention at 1250 ℃ for more than 90 minutes, the ylide began to decompose in large quantities, obtaining more free lime.
Hold times are appropriate (about 60 minutes), greater than 2 wt% at 1300 degrees celsius. The retention time of alite, C3A and gypsum to higher temperatures was synthesized at levels greater than 40 wt%. The incubation time is 60 minutes from 1275 ℃, and the ylide decomposition is fastest. After incubation at 1300 ℃ for 60 minutes, the decomposition rate of the zeolite decreased. The free lime content does not decrease linearly with the formation of alite, since during its decomposition free lime diffuses into contact with alite. Furthermore, the optimum phase combination of the ACSA clinker is in the range of 40 wt%. With the addition of the copper slag and the phosphorus slag, the coexistence temperature interval of the alite and the ylide is optimized to be 1225-1350 ℃.
FIGS. 4-7 show bse backscatter images of ACSA cement clinker synthesized at 1250 deg.C, 1275 deg.C, 1300 deg.C and 1350 deg.C respectively, with 1 hour incubation time. The light to dark contrast on each graph represents the different stages of molecular mass, which are arranged in the order of C4AF, C3S, C2S, C3A, C4A3$ and lime. With increasing temperature, alite crystallizes into a more regular shape. At 1250 ℃, alite is formed in the middle of C2S or at the edge of C3A, and the shape is irregular. The free lime is distributed mainly at C2S and the edge of the cave. Starting at 1275C, a part of the alite particles had rounded edges and these particles were always contained in the C3A and C4AF phases. However, alite is still on the way to crystallize better. There is a clear boundary between C3S and C2S at 1300 degrees celsius. The size of alite is larger than that of belite. Belite is round and is common in portland cement. The free lime showed small particles (P8) without streaks, encased in alite crystals. The small particles with striations, measured by EDS, have a Ca/Si molar ratio greater than 5, which may be a mixture of C3S and CaO. C3A and C4AF were dispersed as interstitial phases between alite and belite. At a temperature of 1350 c, the alite had a hexagonal cross-section and larger plates. The crystal size of alite is much larger than normal. As the iron modulus increases, the amount of liquid phase increases. In addition, as the sulfur slag is doped, the liquid phase properties are significantly changed, the viscosity is reduced, and therefore, at a lower temperature, the diffusion of calcium oxide is accelerated, and large alite crystals are formed. The chlorophyllin is dispersed in the interstitial phase and the ylite recrystallizes in regular hexagonal or tetragonal form of larger size, as seen from the cross section, with the prolonged heating time of the ACSA clinker at 1300 ℃. However, with a holding time of 2h, the gas evolution in the clinker increased, the alite shape became more irregular and the curve edges increased. It is noted that the fractions C3A and C4AF are mixed distributed as interstitial phases in the alite phase.
The cement is refined by XRD Rietveld, and a relation graph among the phase contents, the reaction time and the reaction temperature of alite, folilite and free lime is obtained. In addition, temperature and heating time are also important for the formation of alite. After the copper slag and the phosphorus slag are added, the temperature range of coexistence of C3S and the phylline iron ore is 1225-.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination, provided that no structural conflict exists, and the combinations are not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (6)
1. An alite-ylimide cement is characterized by comprising the following components in percentage by weight:
limestone: 70-72 wt.%;
sandstone: 6.5-7.5 wt.%;
fly ash: 6.8-7.0 wt.%;
gypsum: 9.2-9.4 wt.%;
copper slag: 1.4-1.6 wt.%;
phosphorus slag: 2.2-2.4 wt.%;
alumina: 0.7-0.9 wt.%;
silicon oxide: 1.1-1.3 wt.%.
2. An alite-ylimide cement according to claim 1, comprising, in weight percent:
limestone: 71 wt.%;
sandstone: 7 wt.%;
fly ash: 6.9 wt.%;
gypsum: 9.3 wt.%;
copper slag: 1.5 wt.%;
phosphorus slag: 2.3 wt.%;
alumina: 0.8 wt.%;
silicon oxide: 1.2 wt.%.
3. An alite-ylimide cement according to claim 1, wherein the weight loss of limestone, sandstone, fly ash, gypsum, copper slag, phosphorous slag, alumina and silica is obtained by ignition to constant weight at 1000 ℃.
4. A method for preparing alite-ylimide cement, which is prepared by using the raw material of the alite-ylimide cement as claimed in any one of claims 1 to 3, and is characterized by comprising the following concrete steps:
s1, mixing the raw materials of the alite-ylimide cement as claimed in any one of the claims 1 to 3 for a certain time;
s2, pressing the homogenized mixture into a mixture in the shape of a parallel epitaxial wafer by using water;
and S3, sintering the mixture at different temperatures ranging from 1200 ℃ to 1350 ℃ at different time intervals, and taking out samples at different heat preservation times of 0h, 0.5h, 1h, 1.5h and 2h respectively in the sintering process.
5. The method for preparing the sub-crystalline composite cement according to claim 4, wherein the volume of the parallel epitaxial wafer is as follows: 20mm by 5 mm.
6. An alite-ylimide cement according to claim 4, wherein the mixture is sintered in an electric resistance furnace.
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Cited By (1)
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| CN116161883A (en) * | 2023-03-07 | 2023-05-26 | 南京工业大学 | High-alite-belite-calcium sulfoaluminate gelled material synthesized at low temperature by utilizing industrial solid waste and method |
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| CN116161883A (en) * | 2023-03-07 | 2023-05-26 | 南京工业大学 | High-alite-belite-calcium sulfoaluminate gelled material synthesized at low temperature by utilizing industrial solid waste and method |
| CN116161883B (en) * | 2023-03-07 | 2023-11-24 | 南京工业大学 | High-alite-belite-calcium sulfoaluminate gelled material synthesized at low temperature by utilizing industrial solid waste and method |
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