CN113200692A - High-iron phase portland cement product and preparation method thereof - Google Patents
High-iron phase portland cement product and preparation method thereof Download PDFInfo
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- CN113200692A CN113200692A CN202110497073.6A CN202110497073A CN113200692A CN 113200692 A CN113200692 A CN 113200692A CN 202110497073 A CN202110497073 A CN 202110497073A CN 113200692 A CN113200692 A CN 113200692A
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- 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
- C04B7/42—Active ingredients added before, or during, the burning process
- C04B7/421—Inorganic materials
- C04B7/425—Acids or salts thereof
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- 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
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- 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
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- 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
- C04B7/22—Iron ore cements ; Iron rich cements, e.g. Ferrari cements, Kühl cements
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- 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
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention discloses a high-iron phase portland cement product and a preparation method thereof. The preparation method comprises the following steps: mixing high-iron phase portland cement clinker and water according to the weight ratio of 1: (0.15-0.25), uniformly stirring to prepare a wet material, then placing the wet material in a mold to press the wet material into a green body, and then placing the green body in a carbonization curing chamber to carry out accelerated carbonization treatment to obtain a high-iron phase silicate cement product; wherein, the mineral composition of the high-iron phase portland cement clinker is as follows: 20-33% of tricalcium silicate, 3-8% of alpha-dicalcium silicate, 36-41% of gamma-dicalcium silicate, 1-3% of tricalcium aluminate and 18-35% of tetracalcium aluminoferrite. The invention prepares the high-iron phase portland cement product by selecting the cement clinker with specific composition, and the high-iron phase portland cement product with ultrahigh strength and corrosion resistance is formed through the combined action of mineral phase carbonization and hydration; the method of the invention is simple, the raw material source is wide, and the production period is short.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a high-iron phase portland cement product and a preparation method thereof.
Background
Cement is a major raw material for building and infrastructure construction. The cement industry is considered to be one of the highest carbon dioxide emitting industries in the world, and the emission amount accounts for about 25% of the total emission amount of the global industrial sector. At present, mineral admixture is used for replacing cement as an effective means for reducing the emission and energy consumption problems in cement production, but the substitution amount in mixed cement has an upper limit and can influence the development of the early strength of a test piece, and the problem cannot be solved fundamentally, so that the problems of carbon dioxide emission and high energy consumption caused by cement production are solved, and the development of a novel silicate cementing material with low energy consumption and low emission is the development direction of the future cement industry.
Compared with cast-in-place concrete, the member production has the advantages of good production conditions, stable product quality, high construction speed, short production period and the like, and is an important development direction for future building construction. However, conventional silicate prefabricated parts have some disadvantages, mainly represented by the fact that the production of silicate materials for prefabricated parts consumes a large amount of energy materials and emits a large amount of carbon dioxide; the traditional maintenance process has high maintenance energy consumption; the problems of internal structure damage, later mechanical property reduction, crack generation and insufficient durability caused by the mode of shortening the period of rapid maintenance of the prefabricated part are serious. In recent years, the technology of producing new preforms by carbonization has been widely studied and focused. Compared with the production technology of common prefabricated parts, the technology for producing the prefabricated parts by carbonization has higher reaction rate and higher mechanical durability, is particularly suitable for the production process of the prefabricated parts for buildings, and can effectively improve the deterioration of the structure and the performance of the traditional prefabricated part products caused by quick maintenance.
At present, only a small amount of patents of carbonized products of ordinary portland cement concrete are utilized, such as the patent of the applied patent of the preparation method of self-pulverized clinker portland slag cement (application number: CN 102491655), the self-pulverized clinker in the self-pulverized clinker portland slag cement of the invention is only an external phase, and slag is a main cementing material. A method for preparing low-temp calcined clinker and its products by mineralizing with carbon dioxide (application number: 201410661078.8) features that the strength of said low-temp calcined clinker product is only 76.5MPa in 28 days, and the application field is limited. A process for preparing self-powdered low-calcium cement and its prefabricated products (application 201510718970.X) features that the main minerals are calcium silicate, tricalcium silicate and gamma-C2S and a liquid phase, the cement clinker does not belong to a silicate system, and at the same time, only a carbonized phase and a non-hydrated phase exist in the system, so that the size of the final component is limited. Reports on the use of portland cement as a substrate for structural members to obtain cement concrete products with ultra-high strength have not been found, mainly due to the problem that the carbonation activity of the minerals contained in the commonly used portland cement is low and the hydration of other minerals to provide matrix properties. Therefore, how to prepare a carbonized product of portland cement with high carbonization activity and high performance is a problem to be solved urgently.
Disclosure of Invention
In view of the above, there is a need for a high-iron phase portland cement product and a preparation method thereof, so as to solve the technical problem in the prior art that ordinary portland cement cannot be used for preparing a cement concrete carbonized product with ultrahigh strength.
The invention provides a preparation method of a high-iron phase portland cement product, which comprises the following steps of:
mixing high-iron phase portland cement clinker and water according to the weight ratio of 1: (0.15-0.25), uniformly stirring to prepare a wet material, then placing the wet material in a mold to press the wet material into a green body, and then placing the green body in a carbonization curing chamber to carry out accelerated carbonization treatment to obtain a high-iron phase silicate cement product; wherein, the mineral composition of the high-iron phase portland cement clinker is as follows: 20-33% of tricalcium silicate, 3-8% of alpha-dicalcium silicate, 36-41% of gamma-dicalcium silicate, 1-3% of tricalcium aluminate and 18-35% of tetracalcium aluminoferrite.
A second aspect of the invention provides a high-iron phase portland cement product obtained by the method for preparing the high-iron phase portland cement product provided by the first aspect of the invention.
Compared with the prior art, the invention has the beneficial effects that:
the invention prepares the high-iron phase portland cement product by selecting the cement clinker with specific composition, and the high-iron phase portland cement product with ultrahigh strength and corrosion resistance is formed through the combined action of mineral phase carbonization and hydration; the method of the invention is simple, the raw material source is wide, and the production period is short.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a preparation method of a high-iron phase portland cement product, which comprises the following steps of:
mixing high-iron phase portland cement clinker and water according to the weight ratio of 1: (0.15-0.25), uniformly stirring to prepare a wet material, then placing the wet material in a mold to press the wet material into a green body, and then placing the green body in a carbonization curing chamber to carry out accelerated carbonization treatment to obtain a high-iron phase silicate cement product; wherein, the mineral composition of the high-iron phase portland cement clinker is as follows: 20-33% of tricalcium silicate, 3-8% of alpha-dicalcium silicate, 36-41% of gamma-dicalcium silicate, 1-3% of tricalcium aluminate and 18-35% of tetracalcium aluminoferrite. Preferably, the mineral composition of the high-iron-phase portland cement clinker is: 20-25% of tricalcium silicate, 3-6% of alpha-dicalcium silicate, 38-41% of gamma-dicalcium silicate, 1-3% of tricalcium aluminate and 29-35% of tetracalcium aluminoferrite. More preferably, the mineral composition of the high-iron-phase portland cement clinker is: 20.5 percent of tricalcium silicate, 3.2 percent of alpha-dicalcium silicate, 40.3 percent of gamma-dicalcium silicate, 1.7 percent of tricalcium aluminate and 34.3 percent of tetracalcium aluminoferrite.
In the high-iron phase portland cement clinker selected by the invention, the content of the gamma-dicalcium silicate is 36-41%, so that complete self-pulverization of the clinker can be realized; the content of the tetracalcium aluminoferrite is 18-35%, the high-iron phase can increase the content of a liquid phase in the process of calcining the clinker and adjust the viscosity of the liquid phase, and the high content is a key index for realizing the low-temperature preparation of the cement clinker.
The preparation method effectively utilizes the high carbonization activity of the non-hydraulic mineral gamma-dicalcium silicate, improves the strength of the product, and simultaneously, the carbonization compact layer formed on the surface layer can improve the erosion resistance of the concrete material; the contained hydraulic mineral can partially hydrate to make up the structural defects caused by the gradient structure, and a high-iron phase portland cement product with ultrahigh strength is formed through the combined action of mineral phase carbonization and hydration.
In the preparation process, the mass ratio of the high-iron phase portland cement clinker to the water is limited. If the mass ratio of the cement clinker to water is too high, hydration phase in the clinker is not fully hydrated due to too little water in the system, so that fewer hydration products are formed, and finally, the gradient structure in the component is obvious, so that the performance is deteriorated; the mass ratio of the cement clinker to the water is too low, and the CO is blocked by too much water2The transmission channel affects the final carbonization effect, resulting in performance degradation.
In the embodiment, the high-iron-phase portland cement clinker is obtained by sequentially crushing, pre-homogenizing, batching, adding 1-2 parts of mineralizer, grinding and homogenizing 90.13-92.11 parts of limestone, 1.41-8.36 parts of sandstone and 2.47-6.46 parts of iron ore, then conveying the materials to a suspension preheater and a decomposing furnace, then conveying the preheated raw materials into a rotary kiln, and calcining and quenching the raw materials. Further, the mineralizer is CaF2And CaSO4One or two of them; the calcination temperature is 1250-1350 ℃, and the calcination time is 20-25 min.
In the embodiment, the forming pressure of the blank body is 20-150MPa, the forming time of the blank body is 5-10min, and the thickness of the formed blank body is less than or equal to 300 mm. The reason why the thickness of the formed blank is controlled to be less than 300mm is mainly as follows: firstly, the carbonization effect is not good because the thickness of the blank is too large, and the integral performance is influenced because of the formation of a gradient structure. The thickness of the green body is determined by the contents of a carbonization phase and a hydration phase in the clinker, when the hydration phase is lower and the carbonization phase is higher, the thickness of the component is limited, the harm caused by the formation of a gradient structure is difficult to inhibit due to the effect caused by less hydration of the hydration phase, and a certain influence is generated on the performance of a cement product; the inventor finds that when the thickness of the component is less than 300mm, the thickness of the component has little influence on the performance of the product; when the thickness of the component is more than 300mm, the carbonization depth in the component is limited, and the effect brought by hydration of a hydrated phase is difficult to compensate the harm brought by a gradient structure, so that the performance is deteriorated. Secondly, the maintenance cost is increased when the thickness of the blank is too large.
In the embodiment, the temperature in the carbonization curing chamber is 20-40 ℃, the relative humidity is 75-100%, the carbon dioxide concentration is 75-100%, the air pressure is 1-5 atmospheric pressures, and the carbonization curing time is 5-16 h.
A second aspect of the invention provides a high-iron phase portland cement product obtained by the method for preparing the high-iron phase portland cement product provided by the first aspect of the invention.
For avoiding redundancy, part of the raw materials of the present invention are summarized in table 1:
TABLE 1 chemical composition of the starting materials
| Raw materials | Loss on ignition | CaO | SiO2 | Al2O3 | Fe2O3 | MgO |
| Limestone | 41.40 | 53.21 | 1.02 | 1.20 | 0.09 | 1.02 |
| Sandstone | 2 | 0.50 | 92.01 | 1.91 | 1.56 | 1.87 |
| Iron ore | 10.13 | 7.57 | 9.49 | 4.04 | 43.80 | 3.87 |
Example 1
The present example provides a high iron phase portland cement article obtained by the steps of:
(1) 90.13 parts of limestone, 6.46 parts of iron ore and 1.41 parts of sandstone are sequentially crushed, pre-homogenized, proportioned and added with a mineralizer (CaF)22 portions), grinding and homogenizing, transferring into a rotary kiln through a preheater and a decomposing furnace, calcining for 20 minutes at 1250 ℃, and then quenching to obtain high-iron phase portland cement clinker;
(2) mixing 87 parts of the high-iron phase portland cement clinker and 13 parts of tap water, uniformly stirring to prepare a wet material, then putting the wet material into a mold with a certain shape, and pressing to form a blank, wherein the blank is a plate with the thickness of 400 x 20mm, the forming pressure is 20MPa, and the forming time is 5 minutes; and (3) placing the blank body in a carbonization curing chamber for accelerated carbonization treatment, wherein the carbonization conditions are that the temperature is 20 ℃, the relative humidity is 75%, the carbon dioxide concentration is 75%, the partial pressure is 1bar, and performing accelerated carbonization for 5 hours to obtain the high-iron phase silicate cement product.
Example 2
The present example provides a high iron phase portland cement article obtained by the steps of:
(1) 92.11 parts of limestone, 6.05 parts of iron ore and 8.36 parts of sandstone are sequentially crushed, pre-homogenized, proportioned and added with a mineralizer (CaSO)41 part), grinding and homogenizing, transferring into a rotary kiln through a preheater and a decomposing furnace, calcining at 1280 ℃ for 20 minutes, and then quenching to obtain high-iron phase portland cement clinker;
(2) mixing 85 parts of the high-iron phase portland cement clinker and 15 parts of tap water, uniformly stirring to prepare a wet material, then putting the wet material into a mold with a certain shape, and pressing to form a blank, wherein the blank is a plate with the thickness of 400 x 100mm, the forming pressure is 70MPa, and the forming time is 6 minutes; and (3) placing the green body in a carbonization curing chamber for accelerated carbonization treatment, wherein the carbonization conditions are that the temperature is 30 ℃, the relative humidity is 85 percent, the carbon dioxide concentration is 85 percent, the partial pressure is 2bar, and carrying out accelerated carbonization for 7 hours to obtain the high-iron phase silicate cement product.
Example 3
The present example provides a high iron phase portland cement article obtained by the steps of:
(1) will be provided with90.98 parts of limestone, 2.63 parts of sandstone and 4.39 parts of iron ore are crushed, pre-homogenized, mixed and added with mineralizer (CaF)22 portions), grinding and homogenizing, transferring into a rotary kiln through a preheater and a decomposing furnace, calcining for 25 minutes at 1300 ℃, and then quenching to obtain high-iron phase portland cement clinker;
(2) mixing 83 parts of the high-iron phase portland cement clinker and 17 parts of tap water, uniformly stirring to prepare a wet material, then putting the wet material into a mold with a certain shape, and pressing to form a blank, wherein the blank is a plate with the thickness of 400 x 150mm, the forming pressure is 100MPa, and the forming time is 8 minutes; and (3) placing the blank body in a carbonization curing chamber for accelerated carbonization treatment, wherein the carbonization conditions are 35 ℃ of temperature, 90% of relative humidity, 90% of carbon dioxide concentration and 3bar of partial pressure, and carrying out accelerated carbonization for 9 hours to obtain the high-iron phase silicate cement product.
Example 4
The present example provides a high iron phase portland cement article obtained by the steps of:
(1) crushing 90.59 parts of limestone, 4.94 parts of sandstone and 2.47 parts of iron ore in sequence, pre-homogenizing, batching and adding a mineralizer (CaF)21 part of CaSO41 portion), grinding and homogenizing, transferring into a rotary kiln through a preheater and a decomposing furnace, calcining for 25 minutes at 1350 ℃, and then quenching to obtain high-iron-phase portland cement clinker;
(2) mixing 80 parts of the high-iron phase portland cement clinker and 20 parts of tap water, uniformly stirring to prepare a wet material, then putting the wet material into a mold with a certain shape, and pressing to form a blank, wherein the blank is a plate with the thickness of 400 x 300mm, the forming pressure is 150MPa, and the forming time is 10 minutes; and (3) placing the blank body in a carbonization curing chamber for accelerated carbonization treatment, wherein the carbonization conditions are that the temperature is 40 ℃, the relative humidity is 100%, the carbon dioxide concentration is 100%, and the partial pressure is 5bar, and carrying out accelerated carbonization for 16 hours to obtain the high-iron phase silicate cement product.
Example 5
Example 5 differs from example 4 only in that in example 5 the blank is a 400 x 400mm sheet.
Comparative example 1
Comparative example 1 differs from example 4 only in that the cement clinker in comparative example 1 is obtained by the following steps:
88.54 parts of limestone, 2.24 parts of iron ore and 7.22 parts of sandstone are sequentially crushed, pre-homogenized, proportioned and added with a mineralizer (CaF)21 part of CaSO41 part), grinding and homogenizing, transferring into a rotary kiln through a preheater and a decomposing furnace, calcining for 25 minutes at 1350 ℃, and then quenching to obtain cement clinker;
comparative example 2
Comparative example 2 differs from example 4 only in that the cement clinker in comparative example 2 is obtained by the following steps:
91.43 parts of limestone, 3.97 parts of sandstone and 2.60 parts of iron ore are crushed, pre-homogenized, mixed and added with mineralizer (CaF)21 part of CaSO41 portion), grinding and homogenizing, transferring into a rotary kiln through a preheater and a decomposing furnace, calcining for 25 minutes at 1350 ℃, and then quenching to obtain cement clinker; the obtained cement clinker has large particle size and is not in a complete pulverization state, and further grinding operation is needed.
Comparative example 3
Comparative example 3 differs from example 4 only in that the cement clinker in comparative example 3 is obtained by the following steps:
sequentially crushing 87.31 parts of limestone, 9.84 parts of sandstone and 0.84 part of iron ore, pre-homogenizing, batching and adding a mineralizer (CaF)21 part of CaSO41 portion), grinding and homogenizing, transferring into a rotary kiln through a preheater and a decomposing furnace, calcining for 25 minutes at 1350 ℃, and then quenching to obtain cement clinker;
comparative example 4
Comparative example 4 differs from example 4 only in that in comparative example 4, the mass ratio of cement clinker to water is 1: 0.1.
Comparative example 5
Comparative example 5 differs from example 4 only in that in comparative example 4 the mass ratio of cement clinker to water is 1: 0.3.
TABLE 2 compositions of cement clinker obtained in examples 1 to 4 and comparative examples 1 to 3
Test group
The cement products obtained in the above examples 1 to 5 and comparative examples 1 to 5 were subjected to performance tests, and the results are shown in Table 3.
The compressive strength and the flexural strength are according to GB/T50081-2002 Standard of Experimental methods for mechanical properties of ordinary concrete; diffusion coefficient of chloride ion: JC/T1086-2008, inspection method of diffusion coefficient of cement chloride ion; water absorption: ASTM C1585-2013.
TABLE 3
As can be seen from Table 2, the cement products obtained in the embodiments 1 to 5 of the invention all have good compressive strength, breaking strength and erosion resistance.
Compared with the cement clinker obtained in the example 4, the cement clinker obtained in the comparative example 1 contains more carbonization phases and less hydration phases, so that the thickness of the plate is limited, the gradient structure is obvious due to the over-thickness of the plate, and the performance is deteriorated.
Compared with example 4, the cement clinker composition of comparative example 2 contains less carbonization phase and more hydration phase, the reduction of the carbonization phase leads to the reduction of carbonization products, the hydration phase is excessive, but the formation amount of the hydration products is limited, and finally the gradient structure of the final component is obvious, and the performance is deteriorated.
Compared with example 4, the cement clinker composition of comparative example 3 has a lower content of iron phase, resulting in too few hydrated phases (tricalcium silicate) formed in the clinker, and a gradient structure of the member after carbonization treatment is obvious, resulting in performance deterioration.
Compared with example 4, the comparative example 4 adds less water, and the hydration phase in the clinker is not fully hydrated due to too little water in the system, so that a less hydration phase is formed, and the gradient structure in the final component is obvious.
In comparative example 5, where more water was added than in example 4, the CO was blocked by the excess water2The transmission channel affects the final carbonization effect, resulting in performance degradation.
Compared with the prior art, the invention has the beneficial effects that:
the high-iron phase portland cement clinker disclosed by the invention is low in sintering temperature and reduced in high-calcium mineral phase component proportion, and due to the reduction of the high-calcium mineral phase component and the reduction of the energy consumption requirement, the selection of the cement clinker on the quality of a calcium source and the selection range of fuels are enlarged, so that the limitation of cement production on the requirements of raw materials and energy is relieved to a certain extent;
the prefabricated product produced and prepared by the invention has the characteristic of high setting and hardening speed, can achieve the mechanical property of standard maintenance of the ordinary cement prefabricated product for 28 days within 16 hours generally under the condition that the thickness of the prefabricated product is less than 300mm, and obviously shortens the production period.
The high-iron phase portland cement product is particularly suitable for producing precast slabs, duct pieces and the like, has the characteristics of high strength and corrosion resistance, can be used for engineering application such as building surface protection, tunnel construction and the like, can obviously prolong the service life of engineering, and reduces the cost.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The preparation method of the high-iron phase portland cement product is characterized by comprising the following steps of:
mixing high-iron phase portland cement clinker and water according to the weight ratio of 1: (0.15-0.25), uniformly stirring to prepare a wet material, then placing the wet material in a mold to press the wet material into a green body, and then placing the green body in a carbonization curing chamber to carry out accelerated carbonization treatment to obtain a high-iron phase silicate cement product; wherein the mineral composition of the high-iron phase portland cement clinker is as follows: 20-33% of tricalcium silicate, 3-8% of alpha-dicalcium silicate, 36-41% of gamma-dicalcium silicate, 1-3% of tricalcium aluminate and 18-35% of tetracalcium aluminoferrite.
2. The method for preparing a high-iron-phase portland cement product according to claim 1, wherein the high-iron-phase portland cement clinker is prepared by sequentially crushing, pre-homogenizing, blending, adding 1-2 parts of mineralizer, grinding and homogenizing limestone 90.13-92.11 parts, sandstone 1.41-8.36 parts, and iron ore 2.47-6.46 parts, and then conveying the mixture to a suspension preheater and a decomposing furnace, and then conveying the preheated raw material to a rotary kiln for calcination and quenching.
3. The method of claim 2, wherein the mineralizer is CaF2And CaSO4One or two of them.
4. The method for preparing a high-iron phase portland cement product according to claim 2, wherein the calcination temperature is 1250-.
5. The method for preparing a high-iron phase portland cement product according to claim 1, wherein the green body molding pressure is 20-150MPa, and the green body molding time is 5-10 min.
6. The method of claim 1, wherein the thickness of the shaped body is less than or equal to 300 mm.
7. The method for preparing a high-iron phase portland cement product according to claim 1, wherein the temperature in the carbonization curing chamber is 20-40 ℃, the relative humidity is 75-100%, the carbon dioxide concentration is 75-100%, the air pressure is 1-5 atmospheres, and the carbonization curing time is 5-16 hours.
8. The method of claim 1, wherein the high-iron portland cement clinker has a mineral composition of: 20-25% of tricalcium silicate, 3-6% of alpha-dicalcium silicate, 38-41% of gamma-dicalcium silicate, 1-3% of tricalcium aluminate and 29-35% of tetracalcium aluminoferrite.
9. The method of claim 1, wherein the high-iron portland cement clinker has a mineral composition of: 20.5 percent of tricalcium silicate, 3.2 percent of alpha-dicalcium silicate, 40.3 percent of gamma-dicalcium silicate, 1.7 percent of tricalcium aluminate and 34.3 percent of tetracalcium aluminoferrite.
10. A high-iron phase portland cement product obtained by the method of preparing the high-iron phase portland cement product according to any one of claims 1 to 9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113956000A (en) * | 2021-11-22 | 2022-01-21 | 华新水泥股份有限公司 | Cement kiln tail gas carbonization building prefabricated product and preparation method thereof |
| CN114180990A (en) * | 2021-12-16 | 2022-03-15 | 武汉理工大学 | Carbonization method and carbonization device for calcium silicate-containing mineral prefabricated part |
| CN115159873A (en) * | 2022-06-15 | 2022-10-11 | 武汉理工大学 | High-iron phase-modified gehlenite high-activity cement clinker and preparation and application thereof |
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| CN114180990A (en) * | 2021-12-16 | 2022-03-15 | 武汉理工大学 | Carbonization method and carbonization device for calcium silicate-containing mineral prefabricated part |
| CN114180990B (en) * | 2021-12-16 | 2022-10-04 | 武汉理工大学 | Carbonization method and carbonization device for calcium silicate-containing mineral prefabricated part |
| CN115159873A (en) * | 2022-06-15 | 2022-10-11 | 武汉理工大学 | High-iron phase-modified gehlenite high-activity cement clinker and preparation and application thereof |
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