CN113200692B - High-iron-phase silicate cement product and preparation method thereof - Google Patents
High-iron-phase silicate cement product and preparation method thereof Download PDFInfo
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- CN113200692B CN113200692B CN202110497073.6A CN202110497073A CN113200692B CN 113200692 B CN113200692 B CN 113200692B CN 202110497073 A CN202110497073 A CN 202110497073A CN 113200692 B CN113200692 B CN 113200692B
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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
Abstract
The invention discloses a high-iron-phase silicate cement product and a preparation method thereof. The preparation method comprises the following steps: high-iron phase silicate cement clinker and water are mixed according to the following ratio of 1: mixing the materials according to the mass ratio of (0.15-0.25), stirring uniformly to prepare a wet material, then placing the wet material in a mould to press the wet material into a blank, and placing the blank in a carbonization curing chamber to perform accelerated carbonization treatment to obtain a high-iron-phase silicate cement product; wherein, the mineral composition of the high-iron phase silicate 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 silicate cement product by selecting the cement clinker with specific composition, and forms the high-iron-phase silicate cement product with ultrahigh strength and corrosion resistance through the combined action of mineral phase carbonization and hydration; the method of the invention is simple, the sources of raw materials are 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 silicate 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 world industries with the highest carbon dioxide emissions, which is about 25% of the total emissions from the global industrial sector. At present, the use of mineral admixture instead of cement is an effective means for reducing the problems of cement production emission and energy consumption, however, the substitution amount in mixed cement has an upper limit and can influence the development of early strength of a test piece, and the problem can not be fundamentally solved, so that the problems of carbon dioxide emission and high energy consumption caused by cement production are improved, and the development of a novel silicate gel material with low energy consumption and low emission is the development direction of the cement industry in the future.
Compared with cast-in-place concrete, the component production has the advantages of good production condition, stable product quality, high construction speed, short production period and the like, and is an important development direction of future building construction. However, the conventional silicate prefabricated parts have some disadvantages, mainly represented by the consumption of a large amount of energy materials and the emission of a large amount of carbon dioxide for the production of silicate materials for prefabricated parts; the traditional curing process has high curing energy consumption; the problems of damage to the internal structure, reduction in the later mechanical properties, crack generation and insufficient durability caused by the way of shortening the period of rapid maintenance of the prefabricated part are quite serious. In recent years, carbonization has been widely studied and focused on producing new preform technologies. Compared with the production technology of the common prefabricated part, the technology for producing the prefabricated part by carbonization has faster reaction rate and higher mechanical durability, is particularly suitable for being used as the production technology of the prefabricated part of a building, and can effectively improve the deterioration of the structure and the performance of the traditional prefabricated part product caused by rapid maintenance.
At present, only a small amount of carbonized products of ordinary Portland cement concrete are utilized, such as the patent of the self-pulverization clinker slag Portland cement preparation method (application number: CN 102491655), and the self-pulverization cement clinker in the self-pulverization clinker slag Portland cement is only an external phase, and slag is a main cementing material. A method for preparing low-temperature calcined clinker and its product by mineralizing carbon dioxide (application number: 201410661078.8) has the strength of the prepared low-temperature clinker product of 76.5MPa in 28 days, which limits the application field. A self-pulverizing low-Ca cement and its prefabricated product are prepared from primary minerals including monocalcium silicate, tricalcium disilicate and gamma-C 2 S and a liquid phase, the cement clinker does not belong to silicate systems, and at the same time, only a carbonised phase and a non-hydratable phase exist in the system, which results in limited dimensions of the final component. There has been no report of using portland cement as a component substrate to obtain a cement concrete product having ultra-high strength, mainly because of the problems that the mineral carbonization activity contained in the portland cement commonly used is low and affects the properties of other minerals to provide a matrix. It is therefore a great need to solve the problem how to prepare carbonized articles of portland cement with high carbonization activity and high performance.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a high-iron-phase portland cement product and a preparation method thereof, so as to solve the technical problem that ordinary portland cement cannot prepare a carbonized product with ultrahigh strength cement concrete in the prior art.
The first aspect of the invention provides a method for preparing a high-iron phase silicate cement product, comprising the following steps:
high-iron phase silicate cement clinker and water are mixed according to the following ratio of 1: mixing the materials according to the mass ratio of (0.15-0.25), stirring uniformly to prepare a wet material, then placing the wet material in a mould to press the wet material into a blank, and placing the blank in a carbonization curing chamber to perform accelerated carbonization treatment to obtain a high-iron-phase silicate cement product; wherein, the mineral composition of the high-iron phase silicate 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.
In a second aspect, the invention provides a high-iron phase portland cement article obtainable by the method of preparing a high-iron phase portland cement article according to 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 silicate cement product by selecting the cement clinker with specific composition, and forms the high-iron-phase silicate cement product with ultrahigh strength and corrosion resistance through the combined action of mineral phase carbonization and hydration; the method of the invention is simple, the sources of raw materials are wide, and the production period is short.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The first aspect of the invention provides a method for preparing a high-iron phase silicate cement product, comprising the following steps:
high-iron phase silicate cement clinker and water are mixed according to the following ratio of 1: mixing the materials according to the mass ratio of (0.15-0.25), stirring uniformly to prepare a wet material, then placing the wet material in a mould to press the wet material into a blank, and placing the blank in a carbonization curing chamber to perform accelerated carbonization treatment to obtain a high-iron-phase silicate cement product; wherein, the mineral composition of the high-iron phase silicate 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 silicate cement clinker is as follows: 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% of tricalcium silicate, 3.2% of alpha-dicalcium silicate, 40.3% of gamma-dicalcium silicate, 1.7% of tricalcium aluminate and 34.3% of tetracalcium aluminoferrite.
The content of gamma-dicalcium silicate in the high-iron-phase silicate cement clinker selected by the invention is 36-41%, so that the clinker can be completely self-pulverized; the content of tetracalcium aluminoferrite is 18-35%, the high iron phase can increase the liquid phase content in the clinker calcination process and adjust the viscosity of the liquid phase, and the high content is a key index for realizing the low-temperature preparation of 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 carbonized compact layer formed on the surface layer can improve the erosion resistance of the concrete material; the contained hydraulic mineral can be partially hydrated to make up the structural defect brought by the gradient structure, and the high-iron-phase silicate cement product with ultrahigh strength is formed by the combined action of mineral phase carbonization and hydration.
In the preparation process of the invention, the mass ratio of the high-iron phase silicate cement clinker to water is limited. If the mass ratio of the cement clinker to the water is too high, hydration phases in the clinker are insufficiently hydrated due to too little water in the system, fewer hydration products are formed, and the gradient structure in the final component is obvious, so that the performance is deteriorated; too low a mass ratio of cement clinker to water will retard CO due to excessive moisture 2 The transmission path affects the final carbonization effect, resulting in deterioration of performance.
In the embodiment, the high-iron phase silicate cement clinker is obtained by crushing 90.13-92.11 parts of limestone, 1.41-8.36 parts of sandstone and 2.47-6.46 parts of iron ore in sequence, pre-homogenizing, proportioning, adding 1-2 parts of mineralizer, grinding and homogenizing, then conveying to a suspension preheater and a decomposing furnace, then conveying the preheated raw meal into a rotary kiln, calcining and quenching. Further, the mineralizer is CaF 2 And CaSO 4 One or two of the following components; the calcination temperature is 1250-1350 ℃ and the calcination time is 20-25min.
In the embodiment, the molding pressure of the blank is 20-150MPa, the molding time of the blank is 5-10min, and the thickness of the molded blank is less than or equal to 300mm. The reason why the thickness of the blank after molding is controlled to be 300mm or less is mainly as follows: firstly, the carbonization effect is poor due to the fact that the thickness of the blank body is too large, and the overall performance is affected by the formation of a gradient structure. The thickness of the green body is determined by the content of a carbonization phase and a hydration phase in the clinker, when the hydration phase is low and the carbonization phase is high, the thickness of the component is limited, the effect caused by the hydration of the hydration phase is less, the harm caused by the formation of a gradient structure is difficult to be restrained, and the performance of a cement product is influenced to a certain extent; 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 through a large amount of experimental researches; when the thickness of the component is higher than 300mm, the carbonization depth inside the component is limited, and the damage caused by the gradient structure is difficult to compensate for the effect caused by hydration of the hydration phase, so that the performance is deteriorated. Secondly, the thickness of the blank body is too large, so that the maintenance cost is increased.
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 atmospheres, and the carbonization curing time is 5-16 hours.
In a second aspect, the invention provides a high-iron phase portland cement article obtainable by the method of preparing a high-iron phase portland cement article according to the first aspect of the invention.
For avoiding redundancy, a summary of some raw materials in the present invention is shown in table 1:
TABLE 1 chemical composition of raw materials
| Raw materials | Loss on ignition | CaO | SiO 2 | Al 2 O 3 | Fe 2 O 3 | MgO |
| Limestone powder | 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 embodiment provides a high-iron phase silicate cement product, which is obtained through the following steps:
(1) 90.13 parts of limestone and 6.46 parts of iron ore, and 1.41 parts of sandstone are crushed, pre-homogenized, proportioned and added with mineralizer (CaF) 2 2 parts), grinding and homogenizing, transferring into a rotary kiln through a preheater and a decomposing furnace, calcining at 1250 ℃ for 20 minutes, and then quenching to obtain high-iron-phase silicate cement clinker;
(2) Mixing 87 parts of the high-iron phase silicate cement clinker and 13 parts of tap water, uniformly stirring to prepare a wet material, and then placing the wet material in a mold with a certain shape to press and form a blank, wherein the blank is a plate with the thickness of 400 multiplied by 20mm, and 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 condition is that the temperature is 20 ℃, the relative humidity is 75%, the carbon dioxide concentration is 75%, the partial pressure is 1bar, and the high-iron-phase silicate cement product is obtained after 5 hours of accelerated carbonization.
Example 2
The embodiment provides a high-iron phase silicate cement product, which is obtained through the following steps:
(1) Crushing 92.11 parts of limestone, 6.05 parts of iron ore and 8.36 parts of sandstone in sequence, pre-homogenizing, proportioning, and adding mineralizer (CaSO) 4 1 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 silicate cement clinker;
(2) Mixing 85 parts of the high-iron phase silicate cement clinker and 15 parts of tap water, uniformly stirring to prepare a wet material, and then placing the wet material in a mold with a certain shape to press and form a blank, wherein the blank is a plate with 400 multiplied by 100mm, and the forming pressure is 70MPa, and the forming time is 6 minutes; and (3) placing the blank body in a carbonization curing chamber for accelerated carbonization treatment, wherein the carbonization condition is that the temperature is 30 ℃, the relative humidity is 85%, the carbon dioxide concentration is 85%, the partial pressure is 2bar, and the high-iron-phase silicate cement product is obtained after 7 hours of accelerated carbonization.
Example 3
The embodiment provides a high-iron phase silicate cement product, which is obtained through the following steps:
(1) Crushing 90.98 parts of limestone, 2.63 parts of sandstone and 4.39 parts of iron ore, pre-homogenizing, proportioning and adding mineralizer (CaF) 2 2 parts), grinding and homogenizing, transferring into a rotary kiln through a preheater and a decomposing furnace, calcining at 1300 ℃ for 25 minutes, and then quenching to obtain high-iron-phase silicate cement clinker;
(2) Mixing 83 parts of the high-iron phase silicate cement clinker and 17 parts of tap water, uniformly stirring to prepare a wet material, and then placing the wet material in a mold with a certain shape to press and form a blank, wherein the blank is a plate with the thickness of 400 multiplied by 150mm, and 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 condition is that the temperature is 35 ℃, the relative humidity is 90%, the carbon dioxide concentration is 90%, the partial pressure is 3bar, and the high-iron-phase silicate cement product is obtained after 9 hours of accelerated carbonization.
Example 4
The embodiment provides a high-iron phase silicate cement product, which is obtained through the following steps:
(1) 90.59 parts of limestoneCrushing 4.94 parts of sandstone and 2.47 parts of iron ore sequentially, pre-homogenizing, proportioning, and adding mineralizer (CaF) 2 1 part, caSO 4 1 part), grinding and homogenizing, transferring into a rotary kiln through a preheater and a decomposing furnace, calcining at 1350 ℃ for 25 minutes, and then quenching to obtain high-iron phase silicate cement clinker;
(2) Mixing 80 parts of the high-iron phase silicate cement clinker and 20 parts of tap water, uniformly stirring to prepare a wet material, and then placing the wet material in a mold with a certain shape to press and form a blank, wherein the blank is a plate with the thickness of 400 multiplied by 300mm, and 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 condition is that the temperature is 40 ℃, the relative humidity is 100%, the carbon dioxide concentration is 100%, the partial pressure is 5bar, and the high-iron-phase silicate cement product is obtained after 16 hours of accelerated carbonization.
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 crushed, pre-homogenized, proportioned and added with mineralizer (CaF) 2 1 part, caSO 4 1 part), grinding and homogenizing, transferring into a rotary kiln through a preheater and a decomposing furnace, calcining at 1350 ℃ for 25 minutes, 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:
crushing 91.43 parts of limestone, 3.97 parts of sandstone and 2.60 parts of iron ore, pre-homogenizing, proportioning and adding mineralizer (CaF) 2 1 part, caSO 4 1 part), grinding and homogenizing, transferring into a rotary kiln through a preheater and a decomposing furnace, calcining at 1350 ℃ for 25 minutes, and then quenching to obtain cement clinker; the obtained cement clinker has larger particle size and is not in a completely pulverized state,further grinding operations are required.
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:
crushing 87.31 parts of limestone, 9.84 parts of sandstone and 0.84 parts of iron ore, pre-homogenizing, proportioning and adding mineralizer (CaF) 2 1 part, caSO 4 1 part), grinding and homogenizing, transferring into a rotary kiln through a preheater and a decomposing furnace, calcining at 1350 ℃ for 25 minutes, 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 cement clinker compositions obtained in examples 1 to 4 and comparative examples 1 to 3
Test group
The cement products obtained in examples 1 to 5 and comparative examples 1 to 5 were subjected to performance test, and the results are shown in Table 3.
Compressive strength and flexural strength are according to GB/T50081-2002 standard of general concrete mechanical property experiment method; diffusion coefficient of chloride ion: JC/T1086-2008 method for testing diffusion coefficient of chloride ions of Cement; water absorption rate: ASTM C1585-2013.
TABLE 3 Table 3
As can be seen from Table 2, the cement products obtained in examples 1 to 5 of the present invention all have good compressive strength, flexural strength and erosion resistance.
Compared with the cement clinker in the example 4, the cement clinker in the comparative example 1 contains more carbonized phases and less hydrated phases, the thickness of the plate is limited, the gradient structure is obvious due to the excessive thickness of the plate, and the performance is deteriorated.
The cement clinker composition of comparative example 2 contained less carbonized phase and more hydrated phase than that of example 4, and the decrease of carbonized phase resulted in the decrease of carbonized product, the excessive hydrated phase, but the limited formation of hydrated product, and finally resulted in the remarkable gradient structure of the final member and the deterioration of the performance.
The lower iron phase content in the cement clinker composition of comparative example 3 compared to example 4 resulted in too little hydrated phase (tricalcium silicate) formed in the clinker, and the gradient structure of the member after carbonization treatment was remarkable, resulting in deterioration of performance.
Compared with example 4, the comparative example 4 has less water, the hydration phase in the clinker is insufficient due to the too little water in the system, so that less hydration phase is formed, and the gradient structure in the final component is obvious.
As compared with example 4, the addition of more water in comparative example 5 will retard CO due to excessive moisture 2 The transmission path affects the final carbonization effect, resulting in deterioration of performance.
Compared with the prior art, the invention has the beneficial effects that:
the high-iron-phase silicate cement clinker has low firing temperature and reduced high-calcium mineral phase component ratio, and the high-calcium mineral phase component is reduced and the energy consumption requirement is reduced, so that the selection range of the cement clinker production for the quality of a calcium source and the selection range of fuel are enlarged, and the limitation of cement production on raw materials and energy requirements is relieved to a certain extent;
the prefabricated product produced and prepared by the method has the characteristic of high setting and hardening speed, and can reach the mechanical property of normal cement prefabricated product standard curing for 28 days within 16 hours under the condition that the thickness of the product is less than 300mm, thereby obviously shortening the production period.
The high-iron-phase silicate cement product is particularly suitable for producing precast slabs, segments and the like, has the characteristics of high strength and corrosion resistance, can be used for engineering applications such as building surface protection, tunnel construction and the like, can obviously prolong the service life of engineering and reduce the cost.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (7)
1. The preparation method of the high-iron-phase silicate cement product is characterized by comprising the following steps of:
high-iron phase silicate cement clinker and water are mixed according to the following ratio of 1: mixing the materials according to the mass ratio of (0.15-0.25), stirring uniformly to prepare a wet material, then placing the wet material in a mould to press the wet material into a blank, and placing the blank in a carbonization curing chamber to perform accelerated carbonization treatment to obtain a high-iron-phase silicate cement product; wherein, the liquid crystal display device comprises a liquid crystal display device,
the mineral composition of the high-iron phase silicate 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 high-iron phase silicate cement clinker is obtained by sequentially crushing 90.13-92.11 parts of limestone, 1.41-8.36 parts of sandstone and 2.47-6.46 parts of iron ore, pre-homogenizing, proportioning, adding 1-2 parts of mineralizer, grinding and homogenizing, then conveying to a suspension preheater and a decomposing furnace, then conveying preheated raw materials into a rotary kiln, and calcining and quenching; the calcination temperature is 1250-1350 ℃, and the calcination time is 20-25min;
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.
2. The method for preparing a high-iron phase silicate cement product according to claim 1, wherein the mineralizer is CaF 2 And CaSO 4 One or two of them.
3. The method for preparing a high-iron-phase silicate cement product according to claim 1, wherein the blank forming pressure is 20-150MPa, and the blank forming time is 5-10min.
4. The method for producing a high-iron-phase portland cement product according to claim 1, wherein the thickness of the green body after press molding is 300mm or less.
5. The method of producing a high-iron phase portland cement product according to claim 1, wherein 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.
6. The method of producing a high-iron phase portland cement product according to claim 1, wherein the mineral composition of the high-iron phase portland cement clinker is: 20.5% of tricalcium silicate, 3.2% of alpha-dicalcium silicate, 40.3% of gamma-dicalcium silicate, 1.7% of tricalcium aluminate and 34.3% of tetracalcium aluminoferrite.
7. A high-iron-phase portland cement product obtained by the method for producing a high-iron-phase portland cement product according to any one of claims 1 to 6.
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| CN105347706B (en) * | 2015-10-29 | 2017-05-10 | 河南理工大学 | Autogenously-pulverizable low calcium cement, and making method of prefabricated products thereof |
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| JP2017095300A (en) * | 2015-11-24 | 2017-06-01 | 株式会社トクヤマ | Cement clinker |
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