CN112811835B - Aluminate cement preparation method - Google Patents
Aluminate cement preparation method Download PDFInfo
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- CN112811835B CN112811835B CN202110049974.9A CN202110049974A CN112811835B CN 112811835 B CN112811835 B CN 112811835B CN 202110049974 A CN202110049974 A CN 202110049974A CN 112811835 B CN112811835 B CN 112811835B
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- aluminate 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
- C04B7/24—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
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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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/065—Polyacrylates; Polymethacrylates
- C04B16/0658—Polyacrylonitrile
-
- 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
-
- 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
- C04B7/32—Aluminous cements
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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
- C04B7/424—Oxides, Hydroxides
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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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- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of cement preparation, and particularly relates to a preparation method of aluminate cement. Crushing the pretreated red mud, limestone, aluminum ash and industrial alumina; uniformly mixing the crushed raw materials, and then adding copper sulfate into the obtained mixture to prepare an aluminate cement raw material; calcining the aluminate cement raw material, and then cooling the calcined aluminate cement raw material along with a furnace to prepare aluminate cement clinker; adding polyacrylonitrile short fiber into the obtained aluminate cement clinker, and grinding to obtain the aluminate cement. According to the preparation method of the aluminate cement, the red mud, the aluminum ash and other solid waste raw materials are adopted, so that the production cost of the cement is greatly reduced under the condition of ensuring the performance of the prepared Portland cement; the preparation method of the aluminate cement has simple preparation process, low energy consumption and easily controlled process parameters due to the reduction of the calcination temperature.
Description
Technical Field
The invention belongs to the technical field of cement preparation, and particularly relates to a preparation method of aluminate cement.
Background
The red mud is high-alkaline slurry discharged in the production of industrial alumina, and mainly comprises the following chemical components: CaO, SiO2、Fe2O3、Al2O3And the waste residues belong to industrial harmful waste residues, and if the waste residues are not reasonably utilized, the water quality is damaged, cultivated land is occupied, plant growth is harmed, and serious environmental pollution is caused. The annual discharge amount of red mud in China is as high as 300 million tons, and the utilization rate is only about 15%. At present, the utilization of the red mud mainly focuses on plastic fillers, paving materials, cement, concrete additives and the like, and most of the red mud is still stacked in the open air and is not utilized. The treatment and comprehensive utilization of red mud have attracted general attention at home and abroad, and are one of the important problems which are urgently needed to be solved by the aluminum industry at present.
The aluminate cement is a hydraulic cement with calcium aluminate as main mineral phase and its main chemical component isCaO and Al2O3. Because the aluminate cement has short hardening time, high early strength and quick condensation at low temperature, the aluminate cement is called as 'one-day concrete', and is widely applied to emergency construction and rush repair engineering such as military engineering, bridges, roads, airport runways and the like; meanwhile, the aluminate cement has excellent high temperature resistance and weak acid and alkali corrosion resistance, so that the aluminate cement is widely applied to the fields of refractory castable, refractory concrete and the like.
How to apply the red mud to the preparation of aluminate cement under the condition of not influencing the performance of the aluminate cement, reduce the production cost of the aluminate cement, improve the service life of the aluminate cement and increase the long-term use strength of the aluminate cement becomes a research hotspot.
Disclosure of Invention
The purpose of the invention is: provides a preparation method of aluminate cement. The aluminate cement prepared by the preparation method has the characteristics of high strength and long service life.
The preparation method of the aluminate cement comprises the following steps:
(1) crushing the pretreated red mud, limestone, aluminum ash and industrial alumina;
(2) uniformly mixing the crushed raw materials in the step (1), and then adding copper sulfate into the obtained mixture to prepare aluminate cement raw material;
(3) calcining the aluminate cement raw material, and then cooling the calcined aluminate cement raw material along with a furnace to prepare aluminate cement clinker;
(4) adding polyacrylonitrile short fiber into the obtained aluminate cement clinker, and grinding to obtain the aluminate cement.
Wherein:
calcining the Bayer process red mud at the temperature of 110-125 ℃ for 2.5-4h to obtain the pretreated red mud in the step (1).
Based on the mass sum of 100 percent of the red mud, the limestone, the aluminum ash and the industrial alumina after pretreatment, the red mud after pretreatment accounts for 20.5 to 22.5 percent, the limestone accounts for 40 to 42 percent, the aluminum ash accounts for 2 to 3.5 percent and the industrial alumina accounts for 33.5 to 37.5 percent.
The red mud, limestone, aluminum ash and industrial alumina after pretreatment are crushed to 250-300 meshes in the step (1).
The aluminum ash in the step (1) is one or a mixture of primary industrial aluminum ash and secondary industrial aluminum ash.
The mass of the copper sulfate in the step (2) accounts for 3.5-4.5% of the sum of the mass of the red mud, the limestone, the aluminum ash and the industrial alumina after pretreatment.
The calcination at the temperature rise rate of 15-25 ℃/min to 900-1150 ℃ for 2-3h is carried out in the step (3).
The mass of the polyacrylonitrile short fiber in the step (4) accounts for 1.5-2.5% of that of the aluminate cement clinker.
Compared with the prior art, the invention has the following beneficial effects:
(1) the preparation method of the aluminate cement adopts the solid waste raw materials such as the red mud, the aluminum ash and the like, and greatly reduces the production cost of the cement under the condition of ensuring the performance of the prepared Portland cement.
(2) According to the preparation method of the aluminate cement, the copper sulfate is added into the raw materials, so that the calcination temperature is greatly reduced, the polyacrylonitrile short fibers are added into the clinker, so that the water in the use process of the aluminate cement can be thoroughly reacted, the strength is enhanced, and the generation of cracks is reduced.
(3) The preparation method of the aluminate cement has simple preparation process, low energy consumption and easily controlled process parameters due to the reduction of the calcination temperature.
Detailed Description
The present invention is further described below with reference to examples.
Example 1
The preparation method of aluminate cement described in this embodiment 1 comprises the following steps:
(1) crushing the pretreated red mud, limestone, aluminum ash and industrial alumina;
(2) uniformly mixing the crushed raw materials in the step (1), and then adding copper sulfate into the obtained mixture to prepare aluminate cement raw material;
(3) calcining the aluminate cement raw material, and then cooling the calcined aluminate cement raw material along with a furnace to prepare aluminate cement clinker;
(4) adding polyacrylonitrile short fiber into the obtained aluminate cement clinker, and grinding to obtain the aluminate cement.
Wherein:
calcining the Bayer process red mud at 118 ℃ for 3.2h to obtain the pretreated red mud in the step (1).
Based on the mass sum of 100% of the red mud, limestone, aluminum ash and industrial alumina after pretreatment, the red mud after pretreatment accounts for 22.5%, the limestone accounts for 40%, the aluminum ash accounts for 2.5% and the industrial alumina accounts for 35%.
The red mud, limestone, aluminum ash and industrial alumina after pretreatment are crushed to 250 meshes in the step (1).
The aluminum ash in the step (1) is first-grade industrial aluminum ash.
The mass of the copper sulfate in the step (2) accounts for 4.0% of the sum of the mass of the red mud, the limestone, the aluminum ash and the industrial alumina after pretreatment.
And (4) increasing the temperature to 1050 ℃ at the heating rate of 20 ℃/min to calcine for 2.5h in the step (3).
The mass of the polyacrylonitrile short fiber in the step (4) accounts for 1.5 percent of that of the aluminate cement clinker.
Example 2
The preparation method of aluminate cement described in this embodiment 2 comprises the following steps:
(1) crushing the pretreated red mud, limestone, aluminum ash and industrial alumina;
(2) uniformly mixing the crushed raw materials in the step (1), and then adding copper sulfate into the obtained mixture to prepare aluminate cement raw material;
(3) calcining the aluminate cement raw material, and then cooling the calcined aluminate cement raw material along with a furnace to prepare aluminate cement clinker;
(4) adding polyacrylonitrile short fiber into the obtained aluminate cement clinker, and grinding to obtain the aluminate cement.
Wherein:
calcining the Bayer process red mud at 125 ℃ for 2.5h to obtain the pretreated red mud in the step (1).
The mass sum of the red mud, limestone, aluminum ash and industrial alumina after pretreatment is 100%, the red mud after pretreatment accounts for 20.5%, the limestone accounts for 42%, the aluminum ash accounts for 2% and the industrial alumina accounts for 35.5%.
The red mud, limestone, aluminum ash and industrial alumina after pretreatment are crushed to 300 meshes in the step (1).
The aluminum ash in the step (1) is a mixture of primary industrial aluminum ash and secondary industrial aluminum ash.
The mass of the copper sulfate in the step (2) accounts for 3.5% of the sum of the mass of the red mud, the limestone, the aluminum ash and the industrial alumina after pretreatment.
And (4) increasing the temperature to 1150 ℃ at the temperature increase rate of 15 ℃/min and calcining for 2h in the step (3).
The mass of the polyacrylonitrile short fiber in the step (4) is 2.0 percent of that of the aluminate cement clinker.
Example 3
The preparation method of aluminate cement described in this embodiment 3 comprises the following steps:
(1) crushing the pretreated red mud, limestone, aluminum ash and industrial alumina;
(2) uniformly mixing the crushed raw materials in the step (1), and then adding copper sulfate into the obtained mixture to prepare aluminate cement raw material;
(3) calcining the aluminate cement raw material, and then cooling the calcined aluminate cement raw material along with a furnace to prepare aluminate cement clinker;
(4) adding polyacrylonitrile short fiber into the obtained aluminate cement clinker, and grinding to obtain the aluminate cement.
Wherein:
calcining the Bayer process red mud at 110 ℃ for 4h to obtain the pretreated red mud in the step (1).
Based on the mass sum of 100% of the red mud, limestone, aluminum ash and industrial alumina after pretreatment, the red mud after pretreatment accounts for 21.5%, the limestone accounts for 41%, the aluminum ash accounts for 3.5% and the industrial alumina accounts for 34%.
The red mud, limestone, aluminum ash and industrial alumina after pretreatment in the step (1) are crushed to 280 meshes.
The aluminum ash in the step (1) is secondary industrial aluminum ash.
The mass of the copper sulfate in the step (2) accounts for 4.5% of the sum of the mass of the red mud, the limestone, the aluminum ash and the industrial alumina after pretreatment.
And (4) increasing the temperature to 900 ℃ at the heating rate of 25 ℃/min to calcine for 3h in the step (3).
The mass of the polyacrylonitrile short fiber in the step (4) is 2.5 percent of that of the aluminate cement clinker.
Comparative example 1
The aluminate cement of the present comparative example 1 is prepared in the same manner as in example 3, except that no copper sulfate is added in the step (2).
Comparative example 2
The aluminate cement of the comparative example 2 is the same as the aluminate cement of the example 3, and the only difference is that no polyacrylonitrile short fiber is added in the step (4).
The portland cements prepared in examples 1-3 and comparative examples 1-2 were subjected to performance tests, and the results are shown in table 1 below:
TABLE 1 compressive strength of aluminate cement
Claims (3)
1. The preparation method of the aluminate cement is characterized by comprising the following steps: the method comprises the following steps:
(1) crushing the pretreated red mud, limestone, aluminum ash and industrial alumina;
(2) uniformly mixing the crushed raw materials in the step (1), and then adding copper sulfate into the obtained mixture to prepare aluminate cement raw material;
(3) calcining the aluminate cement raw material, and then cooling the calcined aluminate cement raw material along with a furnace to prepare aluminate cement clinker;
(4) adding polyacrylonitrile short fiber into the obtained aluminate cement clinker, and grinding to obtain aluminate cement;
wherein:
calcining the Bayer process red mud at the temperature of 110-125 ℃ for 2.5-4h to obtain pretreated red mud in the step (1);
based on the mass sum of 100 percent of the red mud, the limestone, the aluminum ash and the industrial alumina after pretreatment, the red mud after pretreatment accounts for 20.5 to 22.5 percent, the limestone accounts for 40 to 42 percent, the aluminum ash accounts for 2 to 3.5 percent and the industrial alumina accounts for 33.5 to 37.5 percent;
the copper sulfate in the step (2) accounts for 3.5-4.5% of the sum of the mass of the red mud, limestone, aluminum ash and industrial alumina after pretreatment;
in the step (3), the temperature is increased to 900-1150 ℃ at the temperature rise rate of 15-25 ℃/min for calcining for 2-3 h;
the mass of the polyacrylonitrile short fiber in the step (4) accounts for 1.5-2.5% of that of the aluminate cement clinker.
2. The method for producing aluminate cement according to claim 1, characterized in that: in the step (1), the pretreated red mud, limestone, aluminum ash and industrial alumina are crushed to 250-300 meshes.
3. The method for producing aluminate cement according to claim 1, characterized in that: the aluminum ash in the step (1) is one or a mixture of primary industrial aluminum ash and secondary industrial aluminum ash.
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| CN202110049974.9A CN112811835B (en) | 2021-01-14 | 2021-01-14 | Aluminate cement preparation method |
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| CN100360451C (en) * | 2006-04-20 | 2008-01-09 | 中国地质大学（北京） | Method for preparing sulphate aluminium cement by red mud |
| EP2842922B1 (en) * | 2013-09-03 | 2017-11-15 | HeidelbergCement AG | Fluxes/Mineralizers for calcium sulfoaluminate cements |
| CN108863123B (en) * | 2018-07-25 | 2021-08-03 | 西南科技大学 | Process for preparing aluminate cement by using aluminum ash to replace part of high-alumina bauxite |
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