CN116813219A - Low-carbon gel material and preparation method thereof - Google Patents
Low-carbon gel material and preparation method thereof Download PDFInfo
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 66
- 239000000463 material Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000003245 coal Substances 0.000 claims abstract description 54
- 239000000843 powder Substances 0.000 claims abstract description 46
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 35
- 239000010959 steel Substances 0.000 claims abstract description 35
- 239000002893 slag Substances 0.000 claims abstract description 33
- 239000003469 silicate cement Substances 0.000 claims abstract description 19
- 239000010440 gypsum Substances 0.000 claims abstract description 18
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 18
- 239000004094 surface-active agent Substances 0.000 claims abstract description 17
- 238000000227 grinding Methods 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000005303 weighing Methods 0.000 claims abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 41
- 238000001354 calcination Methods 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 16
- 239000000725 suspension Substances 0.000 claims description 13
- 229910021532 Calcite Inorganic materials 0.000 claims description 12
- 239000013078 crystal Substances 0.000 claims description 10
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 claims description 6
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 6
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- 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 claims description 4
- 229920001732 Lignosulfonate Polymers 0.000 claims description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 229940075507 glyceryl monostearate Drugs 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000001788 mono and diglycerides of fatty acids Substances 0.000 claims description 3
- 235000019333 sodium laurylsulphate Nutrition 0.000 claims description 3
- 238000007725 thermal activation Methods 0.000 claims description 3
- 239000005995 Aluminium silicate Substances 0.000 claims description 2
- 235000012211 aluminium silicate Nutrition 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- KZRXPHCVIMWWDS-AWEZNQCLSA-N (4S)-4-amino-5-dodecanoyloxy-5-oxopentanoic acid Chemical compound CCCCCCCCCCCC(=O)OC(=O)[C@@H](N)CCC(O)=O KZRXPHCVIMWWDS-AWEZNQCLSA-N 0.000 claims 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims 1
- 229940071085 lauroyl glutamate Drugs 0.000 claims 1
- 239000002910 solid waste Substances 0.000 abstract description 5
- 239000004566 building material Substances 0.000 abstract description 2
- 239000004568 cement Substances 0.000 description 21
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 235000019738 Limestone Nutrition 0.000 description 6
- 239000004567 concrete Substances 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000006028 limestone Substances 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000004040 coloring Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910052622 kaolinite Inorganic materials 0.000 description 4
- 230000009257 reactivity Effects 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- -1 sodium fatty alcohol Chemical class 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- AVBJHQDHVYGQLS-AWEZNQCLSA-N (2s)-2-(dodecanoylamino)pentanedioic acid Chemical compound CCCCCCCCCCCC(=O)N[C@H](C(O)=O)CCC(O)=O AVBJHQDHVYGQLS-AWEZNQCLSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000001994 activation Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910021487 silica fume Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000004200 deflagration Methods 0.000 description 1
- 230000029087 digestion 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
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000013589 supplement Substances 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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
- C04B7/02—Portland cement
- C04B7/04—Portland cement using raw materials containing gypsum, i.e. processes of the Mueller-Kuehne type
-
- 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
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
-
- 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
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of building materials, in particular to a low-carbon gel material and a preparation method thereof. The material mainly comprises the following raw materials: 25.0-40.0 parts by mass of calcined coal gangue powder, 28.0-50.0 parts by mass of silicate cement clinker, 20.0-30.0 parts by mass of carbonized steel slag micropowder, 2.0-5.0 parts by mass of gypsum and surfactant accounting for 0-0.1% of the total mass. The preparation method comprises the following steps: 1. weighing silicate cement clinker, calcined gangue powder, carbonized steel slag micropowder, gypsum and surfactant in corresponding parts by mass for standby; 2. grinding the silicate cement clinker in the first step into powder; 3. grinding the gypsum obtained in the first step into powder; 4. the carbonized steel slag micropowder, the calcined coal gangue powder, the silicate cement clinker powder, the gypsum powder and the surfactant are uniformly mixed to obtain the low-carbon gelling material, and an effective way is provided for the efficient utilization of a large amount of solid waste coal gangue and steel slag.
Description
Technical Field
The application relates to the technical field of building materials, in particular to a low-carbon gel material and a preparation method thereof.
Background
Gangue is a black gray rock which has lower carbon content and is harder than coal and is associated with a coal bed in the coal forming process, and is generally solid waste generated in the production processes of coal exploitation, excavation and the like. The gangue contains a plurality of minerals: kaolinite, quartz, mica, calcite and iron-containing minerals are equal, with quartz and kaolinite being the main mineral components. The existing idea of cyclic utilization of the coal gangue is generally to use the coal gangue as a cement mixture, and as the coal gangue contains a certain amount of organic carbon more or less, the surface of cement and concrete becomes black, and the use amount of a water reducing agent is increased due to the existence of the organic carbon, so that the use range of the coal gangue as the mixture is also affected. In addition, the gangue is doped into the cement raw material to supplement the aluminosilicate raw material, but the addition of more than 5% of the gangue causes the blockage of the preheater, thereby causing instability of cement production.
The Chinese patent (CN 113045227B) discloses a gangue activation calcination method, which is characterized in that in the calcination process, the mixture spheres are calcined and activated in the oxidation environment at 900-1000 ℃ without reducing atmosphere control, and if the content of iron element mineral in the gangue is more than 5%, the calcined gangue becomes dark red, so that the problem of coloring cement and concrete can be generated. In addition, the calcination temperature of the kaolinite in the gangue is not higher than 850 ℃ generally, but the activity of the metakaolin is greatly reduced. The chinese patent (CN 103864325B) discloses a production system for calcining coal gangue in suspended state, since the coal gangue contains a certain amount of organic volatile matter, the volatilization temperature range of the coal gangue is generally 260-550 ℃, and in the case of suspension calcination of the preheater, the coal gangue reaches the volatilization temperature range of the organic matter in the 1-3-stage preheater before entering the decomposing furnace, so that a great amount of organic volatile matter can deflagrate, even burn through the preheater equipment, resulting in safety accidents. The gangue is calcined in the rotary kiln system, and the particles are large, so that the heat exchange efficiency is poor, the calcination is incomplete, and the activity is relatively poor.
In summary, the problem of heat activation and utilization of the gangue is that volatile organic compounds are contained in the gangue, if the gangue is not fully calcined, the problem of coloring products can be affected, and the gangue is calcined by adopting a rotary kiln, and has a honeycomb shape under a microstructure, so that the activity exertion is limited. Calcination under the preheater system may cause deflagration of the volatile organic compounds before they enter the decomposing furnace, and may cause the preheater to become skinned and clogged, or even burn through.
Disclosure of Invention
In order to solve the technical problems in the prior art, the application aims to provide a low-carbon gelling material and a preparation method thereof, and firstly provides a novel low-carbon gelling material prepared by compounding thermally activated calcined gangue, carbonized steel slag and silicate cement clinker, thereby realizing suspended state calcination of gangue micropowder and providing an effective way for high-efficiency utilization of massive solid waste gangue and steel slag.
In order to achieve the above purpose, the application adopts the following technical scheme:
a low-carbon gel material mainly comprises the following raw materials: 25.0-40.0 parts by mass of calcined coal gangue powder, 28.0-50.0 parts by mass of silicate cement clinker, 20.0-30.0 parts by mass of carbonized steel slag micropowder, 2.0-5.0 parts by mass of gypsum and surfactant accounting for 0-0.1% of the total mass.
As a preferable technical scheme, the calcined coal gangue powder is prepared by performing thermal activation calcination on coal gangue with the mass content of 40% -80% of kaolin, and the loss on ignition of the calcined coal gangue powder is less than or equal to 1.0%.
As a preferable technical scheme, the carbonized steel slag micropowder comprises 12-20wt% of micro-nano calcite crystal stone and 8-12wt% of amorphous SiO 2 The method comprises the steps of carrying out a first treatment on the surface of the And/or the specific surface area of the carbonized steel slag micropowder is 450-550 m 2 /kg。
As a preferable technical scheme, the specific surface area of the calcined coal gangue is 600-700 m 2 Per kg, this is because the porosity of the coal gangue powder after calcination is increased, so that the specific surface area is increased compared with that before calcination.
As a preferable technical scheme, the specific surface area of the silicate cement clinker is 350-400m 2 /kg。
As a preferable technical proposal, the specific surface area of the gypsum is 350-400m 2 /kg。
As a preferable technical scheme, the surfactant comprises any one or a combination of at least two of sodium alkylbenzenesulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, ammonium fatty alcohol polyoxyethylene ether sulfate, sodium lauryl sulfate, lauroyl glutamic acid, glyceryl monostearate and lignin sulfonate.
As a preferable technical scheme, the carbon content of the low-carbon gel material is 0.14-0.224wt%.
As a preferable technical scheme, the preparation method of the calcined coal gangue powder comprises the following steps:
1) Crushing and drying gangue raw ore, and then feeding the crushed and dried gangue raw ore into a ball mill for grinding;
2) Firstly, introducing 100% reducing gas into a vertical tube furnace, then, conveying the ground coal gangue powder into a feeder at the inner top of the vertical tube furnace, conveying the coal gangue powder into the vertical tube furnace through the feeder, and controlling the calcination temperature in the furnace to be 750-850 ℃ and the suspension calcination time to be 5-10s in a suspension state in the descending process of the coal gangue powder;
3) Cooling to obtain calcined gangue micropowder.
The application also discloses a preparation method of the low-carbon gel material, which comprises the following steps:
firstly, weighing Portland cement clinker, calcined gangue powder, carbonized steel slag micropowder, gypsum and a surfactant in corresponding parts by mass for standby;
grinding the silicate cement clinker in the first step into powder;
grinding the gypsum obtained in the first step into powder;
and step four, uniformly mixing the carbonized steel slag micropowder, the calcined coal gangue powder, the silicate cement clinker powder, the gypsum powder and the surfactant which are obtained in the step one, the step two and the step three to obtain the low-carbon gelling material.
The application has the advantages and positive effects that:
1. according to the application, suspended state calcination of the gangue micropowder is realized in the vertical tube furnace, the microcosmic appearance of the calcined gangue is regulated and controlled to be in a sphere shape (shown in figure 1), and the gangue micropowder is statically calcined in a muffle furnace or is similar to a honeycomb shape (shown in figure 2) under the microcosmic state of the calcined gangue in a rotary kiln. The suspension calcined gangue improves the reactivity and reduces the water demand of the low-carbon gelling material.
2. The organic carbon in the gangue is basically burnt out by suspension calcination, so that the problem of coloring cement and concrete products by residual carbon is solved, and the use amount of the water reducer is reduced. However, the calcination in the muffle furnace or the rotary kiln is insufficient, the organic carbon has large loss on ignition (shown in table 3), and residual carbon not only can color cement and concrete, but also can cause the problems of increased usage amount of the water reducer and the like.
3. The reducing atmosphere or the protective gas can be introduced into the vertical tube furnace, so that ferric oxide in the gangue can be changed into ferrous oxide, and the problem of redness of products caused by that iron ore is oxidized into ferric oxide in the oxidizing atmosphere is solved.
4. After the steel slag is carbonized, poor stability is eliminated, a negative carbon cement product can be formed by joining cement, and micro-nano spherical calcite crystals (shown in figures 3 and 4) formed in situ in carbonized steel micropowder are used for replacing natural limestone, so that the consumption of natural limestone resources is reduced, the micro-nano calcite crystals have higher reactivity than the natural limestone, and C in the steel slag 2 S and C 3 Mineral such as S is carbonized by CO in the process of carbonization 2 Takes away CaO and forms amorphous SiO with surface defects at the same time as calcite is formed 2 The reaction activity of the carbonized steel slag micropowder is higher than that of the silica fume, which is beneficial to quickly improving the chemical reaction activity of the carbonized steel slag micropowder in a composite system of calcined coal gangue and ordinary silicate cement and improving the early strength performance of the low-carbon gelling material.
5. The application uses the surfactant to improve the chemical reaction efficiency of the low-carbon gel material system, reduce the water demand and the porosity, and improve the compactness and the early strength.
6. On the premise of ensuring that the 28-day compressive strength of the low-carbon cementing material is more than 42.5MPa, the clinker consumption is reduced to 28% at the lowest, so that on one hand, large-scale digestion of large solid wastes such as coal gangue and steel slag (the maximum of 70% of the solid wastes can be digested) is realized, and on the other hand, the direct carbon emission strength of unit products is obviously reduced due to the low clinker consumption and common silicate cement; in addition, the carbonized steel slag micropowder absorbs and permanently seals a certain proportion of carbon dioxide, thereby endowing the low-carbon gelling material with the negative carbon characteristic. The technology provides an effective method for large-scale consumption of coal gangue electricity and steel slag, and low carbon emission in the cement industry, so that the application has remarkable economic and social benefits.
Drawings
FIG. 1 is a microstructure of a suspension calcined coal gangue in a tube furnace in accordance with the present application;
FIG. 2 is a microstructure of a static calcined coal gangue in a muffle furnace;
FIG. 3 is a microstructure of micro-nano-scale spherical calcite crystals;
fig. 4 is an XRD diffractogram of the micro-nano-scale spherical calcite crystal.
Detailed Description
The technical scheme in the embodiment of the application is clearly and completely described below; obviously; the described embodiments are only a few embodiments of the present application; but not all embodiments. Based on the embodiments in the present application; all other embodiments obtained by those skilled in the art without undue burden; all falling within the scope of the present application.
The low-carbon gel material mainly comprises the following raw materials in percentage by mass: 25.0-40.0 parts of calcined coal gangue powder, 28.0-50.0 parts of silicate cement clinker, 20.0-30.0 parts of carbonized steel slag micropowder, 2.0-5.0 parts of gypsum, and surfactant accounting for 0-0.1% of the total mass, wherein the carbon content of the low-carbon gel material is 0.14-0.224% by weight.
The following description of the preparation method of the low carbon cementing material is given by way of 5 examples, and the properties thereof are compared with the reference cement, the raw material compositions of the low carbon cementing material and the reference cement are carried out with reference to table 1:
TABLE 1 Low carbon gel Material composition
A method for preparing a low carbon gelling material, the method comprising the steps of:
firstly, weighing silicate cement clinker, calcined coal gangue powder, carbonized steel slag micropowder, gypsum and surfactant in corresponding parts by mass according to a table 1 for standby;
grinding the silicate cement clinker in the first step to a specific surface area of 350-400m 2 /kg；
Grinding the gypsum obtained in the step one to a specific surface area of 350-400m 2 /kg；
Step four, uniformly mixing the carbonized steel slag micropowder, the calcined coal gangue powder, the silicate cement clinker powder, the gypsum powder and the surfactant obtained in the step one, the step two and the step three to obtain the low-carbon gelling material, testing the strength of cement for 28 days according to GBT/17671, and the test results are shown in Table 2:
table 2 low carbon gel material strength performance test data
As can be seen from table 2, the low carbon cementitious materials of examples 1-5 all have a 28 day compressive strength above 425 cement standard, examples 1 and 2 obtain higher strength data than standard cement at clinker coefficients of 50% and 45%, which means that the nano calcium carbonate crystals and amorphous silica of calcined gangue and carbonized steel slag in the low carbon cementitious material system exert better chemical reaction under the portland cement system, improve early strengths for 3 days and 7 days, and exceed standard cement strength at 28 days, which means that the low carbon cementitious material exhibits low clinker usage, higher early strength, and excellent post strength. In addition, examples 3-5 demonstrate that even at 28-40% clinker usage, the low carbon gelling material still meets the class standard of 425 cement in Portland cement, which also demonstrates that the low carbon gelling material system of the present application can exert the potential advantages of the components, form complementary advantages, and finally be embodied in physical parameters such as excellent strength properties and sand flow properties.
Preferably, the calcined gangue micropowder in the step one is prepared from 40-80% of gangue by weight of kaolinite through thermal activation calcination, and the loss on ignition is controlled to be less than or equal to 1.0%. The preparation method of the calcined coal gangue powder comprises the following steps:
1) Crushing and drying gangue raw ore, feeding the crushed gangue raw ore into a ball mill, and grinding the gangue raw ore until the specific surface area is 500-600 m 2 /kg；
2) Firstly, introducing CO with the concentration of 100% into a vertical tube furnace 2 The gas is used for controlling the reducing atmosphere, then the ground coal gangue powder is sent into a feeder at the inner top of the vertical tube furnace, the coal gangue powder is sent into the vertical tube furnace through the feeder, the coal gangue powder is in a suspension state in the descending process, the calcination temperature in the furnace is controlled to be 750-850 ℃, and the suspension calcination time is controlled to be 5-10s; the iron oxide in the gangue can be changed into ferrous oxide form to exist by introducing reducing atmosphere or protective gas in the vertical tube furnace, so that the problem of redness of products caused by oxidation of iron ore into ferric oxide in oxidizing atmosphere is solved;
3) Cooling to obtain calcined gangue micropowder with specific surface area of 600-700 m 2 /kg。
According to the application, the coal gangue powder is calcined in a suspension state in the vertical tube furnace, so that the microcosmic appearance of the calcined coal gangue is regulated and controlled to be in a sphere shape (see figure 1), and the reactivity is improved; and the organic carbon in the gangue is basically burnt out by suspension calcination, so that the problem of coloring cement and concrete products by residual carbon is solved, and the use amount of the water reducer is reduced.
After the gangue powder is statically calcined in a muffle furnace or calcined in a rotary kiln, microcosmic gangue micropowder is similar to honeycomb (see figure 2), which shows that the problems of insufficient calcination and larger loss on ignition exist in organic carbon; in addition, residual carbon may not only color cement and concrete, but also cause problems such as an increase in the amount of water reducer used.
Table 3 shows the carbon content of the gangue measured under different calcination modes:
TABLE 3 determination of carbon content in gangue by different calcination methods
| Name of the name | Loss on ignition | Carbon content of |
| Handan coal gangue raw material | 16.50％ | 6.18％ |
| The application relates to a coal gangue suspension calcined by a vertical tube furnace | 0.65％ | 0.56％ |
| Coal gangue calcined in muffle furnace | 3.24％ | 3.08％ |
| Gangue calcined in rotary kiln | 2.86％ | 2.79％ |
Preferably, the carbonized steel slag micropowder in the step one comprises 12 to 20 weight percent of micro-nano calcite crystal and 8 to 12 weight percent of amorphous SiO 2 : the specific surface area of the carbonized steel slag micropowder is 450-550 m 2 /kg. The steel slag is carbonized to eliminate poor stability, and the cement can be addedThe negative carbon cement product is formed, the in-situ formed micro-nano spherical calcite crystal (see fig. 3 and 4) in the carbonized steel micropowder is utilized to replace natural limestone, so that the consumption of natural limestone resources is reduced, the micro-nano calcite crystal has higher reactivity than the natural limestone, and C in steel slag 2 S and C 3 Mineral such as S is carbonized by CO in the process of carbonization 2 Takes away CaO and forms amorphous SiO with surface defects at the same time as calcite is formed 2 The reaction activity of the carbonized steel slag micropowder is higher than that of the silica fume, which is beneficial to quickly improving the chemical reaction activity of the carbonized steel slag micropowder in a composite system of calcined coal gangue and ordinary silicate cement and improving the early strength performance of the low-carbon gelling material.
Preferably, the surfactant in the first step includes any one or a combination of at least two of sodium alkylbenzenesulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, ammonium fatty alcohol polyoxyethylene ether sulfate, sodium lauryl sulfate, lauroyl glutamic acid, glyceryl monostearate and lignin sulfonate. The application uses the surfactant to improve the chemical reaction efficiency of the low-carbon gel material system, reduce the water demand and the porosity, and improve the compactness and the early strength.
The foregoing describes the embodiments of the present application in detail, but the description is only a preferred embodiment of the present application and is not to be construed as limiting the scope of the application. All equivalent changes and modifications within the scope of the present application are intended to be covered by the present application.
Claims (10)
1. The low-carbon gel material is characterized by mainly comprising the following raw materials: 25.0-40.0 parts by mass of calcined coal gangue powder, 28.0-50.0 parts by mass of silicate cement clinker, 20.0-30.0 parts by mass of carbonized steel slag micropowder, 2.0-5.0 parts by mass of gypsum and surfactant accounting for 0-0.1% of the total mass.
2. The low-carbon gelling material of claim 1, wherein the calcined coal gangue powder is prepared from coal gangue with a mass content of 40% -80% of kaolin by thermal activation calcination, and the loss on ignition of the calcined coal gangue powder is less than or equal to 1.0%.
3. The low carbon gelling material of claim 1, wherein the micro-powder of carbonized steel slag comprises 12-20wt% of micro-nano calcite crystal stone and 8-12wt% of amorphous SiO 2 The method comprises the steps of carrying out a first treatment on the surface of the And/or the specific surface area of the carbonized steel slag micropowder is 450-550 m 2 /kg。
4. The low carbon gelling material of claim 1, wherein the calcined coal gangue has a specific surface area of 600-700 m 2 /kg。
5. The low carbon cementitious material of claim 1 wherein the Portland cement clinker has a specific surface area of
350-400m 2 /kg。
6. The low carbon gelling material of claim 1, wherein the specific surface area of gypsum is 350-400m 2 /kg。
7. The low carbon gelling material of claim 1, wherein the surfactant comprises any one or a combination of at least two of sodium alkylbenzenesulfonate, sodium fatty alcohol-polyoxyethylene ether sulfate, ammonium fatty alcohol-polyoxyethylene ether sulfate, sodium lauryl sulfate, lauroyl glutamate, glyceryl monostearate, and lignosulfonate.
8. The low carbon gel material of claim 1, wherein the low carbon gel material has a carbon content of 0.14 to 0.224wt%.
9. The low carbon, gelling material of claim 1, wherein the method of preparing the calcined coal gangue powder comprises:
1) Crushing and drying gangue raw ore, and feeding the crushed gangue raw ore into a ball mill for grinding until the specific surface area is 500-600 m 2 /kg；
2) Firstly, introducing 100% reducing gas into a vertical tube furnace, then, conveying the ground coal gangue powder into a feeder at the inner top of the vertical tube furnace, conveying the coal gangue powder into the vertical tube furnace through the feeder, and controlling the calcination temperature in the furnace to be 750-850 ℃ and the suspension calcination time to be 5-10s in a suspension state in the descending process of the coal gangue powder;
3) Cooling to obtain calcined gangue micropowder.
10. A method of preparing a low carbon gelling material according to claim 1, comprising the steps of:
firstly, weighing Portland cement clinker, calcined gangue powder, carbonized steel slag micropowder, gypsum and a surfactant in corresponding parts by mass for standby;
grinding the silicate cement clinker in the first step into powder;
grinding the gypsum obtained in the first step into powder;
and step four, uniformly mixing the carbonized steel slag micropowder, the calcined coal gangue powder, the silicate cement clinker powder, the gypsum powder and the surfactant which are obtained in the step one, the step two and the step three to obtain the low-carbon gelling material.
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