CN110498623B - Method for preparing self-repairing concrete from vanadium titano-magnetite tailings - Google Patents
Method for preparing self-repairing concrete from vanadium titano-magnetite tailings Download PDFInfo
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- CN110498623B CN110498623B CN201910872266.8A CN201910872266A CN110498623B CN 110498623 B CN110498623 B CN 110498623B CN 201910872266 A CN201910872266 A CN 201910872266A CN 110498623 B CN110498623 B CN 110498623B
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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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- 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
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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
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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)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention discloses a method for preparing self-repairing concrete from vanadium titano-magnetite tailings, which comprises the steps of weighing the vanadium titano-magnetite tailings, a correcting raw material and a mineralizer according to a certain proportion, loading the weighed vanadium titano-magnetite tailings, the correcting raw material and the mineralizer into a novel dry-process cement rotary kiln, calcining the obtained product into clinker, cooling the clinker in a grate cooler, weighing the cooled clinker, the vanadium titano-magnetite tailings, semi-hydrated gypsum and calcium sulphoaluminate according to a certain proportion, grinding the obtained product in a wheel mill, and finally hydrating the obtained product to obtain the self-repairing concrete. The method has the advantages of high component control precision, strong process stability and repeatability, and capability of prolonging the service life of the self-repairing concrete and effectively solving the problem of recycling the building material prepared from the vanadium titano-magnetite tailings.
Description
Technical Field
The invention relates to the technical field of self-repairing concrete preparation, in particular to a method for preparing self-repairing concrete from vanadium titano-magnetite tailings.
Background
The vanadium titano-magnetite tailings are widely used for manufacturing energy-saving and environment-friendly building materials, including foam microcrystalline glass, stair bricks, metal ceramics, water seepage bricks, pavement bricks and the like. But the problem of returning the materials after the service is finished is always difficult to effectively solve. Therefore, a new method is found, the problem of recycling the building material prepared from the vanadium titano-magnetite tailings is solved, and the method is very important for prolonging the service life of the building material and improving the green manufacturing level.
The method fully exerts the repairing function of the active intrinsic self-repairing body by self-repairing concrete technology and new clinker calcining and hydration process optimization, and is a key means for solving the problem of recycling the building material prepared from vanadium titano-magnetite tailings.
Disclosure of Invention
The invention provides a method for preparing self-repairing concrete from vanadium titano-magnetite tailings, aiming at the current situation of the research and development field that the problem of recycling building materials prepared from the vanadium titano-magnetite tailings is difficult to effectively solve by common means.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing self-repairing concrete from vanadium titano-magnetite tailings comprises the following steps:
1) loading vanadium titano-magnetite tailings, a correction raw material and a mineralizer into a dry cement rotary kiln, calcining into clinker, and cooling in a grate cooler to obtain cooled clinker; the correction raw materials comprise calcium carbonate, kaolinite and iron powder, and the mineralizer is a 1:1 mixture of calcium fluoride and dihydrate gypsum;
2) and grinding the cooled clinker, the vanadium titano-magnetite tailings, the semi-hydrated gypsum and the calcium sulphoaluminate into powder, and finally hydrating to finally obtain the self-repairing concrete material.
As a further improvement of the method, the vanadium titano-magnetite tailings, calcium carbonate, kaolinite, iron powder and a mineralizer are prepared from the following components in percentage by mass (57.4-65.1): (21-29): (10-13): (1.7-2.7): (1.9-2.8).
As a further improvement of the invention, the dry-method cement rotary kiln is an SLC suspension preheater kiln with the daily yield of 5000 tons.
As a further improvement of the invention, the average cooling rate of the clinker is 30-50 ℃/min.
As a further improvement of the invention, the clinker, the vanadium titano-magnetite tailings, the semi-hydrated gypsum and the calcium sulphoaluminate are (38.9-45.1) in percentage by mass: (41-44): (10-13): (3.7-4.1).
As a further improvement of the invention, the rotation speed of the wheel milling main shaft is 35-45 r/min.
As a further improvement of the invention, the water addition amount of the hydration treatment is 300 ml/kg of material.
As a further improvement of the invention, the prepared self-repairing concrete material has the compression strength of more than or equal to 338.5MPa, the microhardness of more than or equal to 2.3GPa, the bending strength of more than or equal to 240MPa and the self-repairing rate of vibration damage cracks of more than or equal to 73 percent.
Compared with the prior art, the invention has the following characteristics and advantages:
firstly weighing vanadium titano-magnetite tailings, a correction raw material and a mineralizer according to a certain proportion, loading the materials into a novel dry cement rotary kiln, calcining the materials into clinker, cooling the clinker in a grate cooler, weighing the cooled clinker, the vanadium titano-magnetite tailings, semi-hydrated gypsum and calcium sulfoaluminate according to a certain proportion, grinding the mixture by wheel grinding, and finally hydrating; wherein, the calcination of the clinker by the new method is beneficial to the general popularization and application of the technical industry and provides technical guarantee for industrialization. The calcium sulphoaluminate is a self-repairing intrinsic body and is used for the self-repairing function when the internal defects of the concrete occur. The vanadium titano-magnetite tailings have the dual functions of raw materials and aggregates, and the utilization rate of the vanadium titano-magnetite tailings is greatly improved. The compressive strength of the self-repairing concrete material prepared by the invention is larger than or equal to 338.5MPa, the microhardness is larger than or equal to 2.3GPa, the bending strength is larger than or equal to 240MPa, and the self-repairing rate of the vibration damage crack is larger than or equal to 73%. The method has the advantages of high component control precision, strong process stability and repeatability, and capability of prolonging the service life of the self-repairing concrete and effectively solving the problem of recycling the building material prepared from the vanadium titano-magnetite tailings.
Further, in the process of preparing the self-repairing concrete, in order to solve the problem that the existing method is difficult to effectively solve the problem of recycling the building material prepared from the vanadium titano-magnetite tailings, the invention adopts a self-repairing concrete technology, a new method clinker calcination and hydration process optimization to research the relationship between the new method clinker calcination process, a cooling process, an intrinsic self-repairing technology, a hydration process and the performance of the self-repairing concrete, namely: for self-repairing concrete, the best clinker calcining process, cooling process, intrinsic self-repairing technology and hydration process with high performance are maintained.
Detailed Description
The invention relates to a method for preparing self-repairing concrete from vanadium titano-magnetite tailings, which comprises the following steps:
(1) according to the formula (57.4-65.1): (21-29): (10-13): (1.7-2.7): (1.9-2.8) weighing vanadium-titanium magnetite tailings, calcium carbonate, kaolinite, iron powder and a mineralizer in proportion, loading the tailings into a 5000-ton-day SLC suspension preheater kiln, calcining the mixture into clinker, and cooling the clinker in a grate cooler at the speed of 30-50 ℃/min to obtain cooled clinker;
(2) cooling clinker, vanadium titano-magnetite tailings, semi-hydrated gypsum and calcium sulphoaluminate according to the weight ratio of (38.9-45.1): (41-44): (10-13): (3.7-4.1) weighing, grinding and grinding in a wheel mill, wherein the rotating speed of a wheel mill main shaft is 35-45 r/min, and finally hydrating, wherein the water adding amount is 300 ml/kg of material, so that the self-repairing concrete material is finally obtained.
As a further improvement of the invention, the prepared self-repairing concrete material has the compression strength of more than or equal to 338.5MPa, the microhardness of more than or equal to 2.3GPa, the bending strength of more than or equal to 240MPa and the self-repairing rate of vibration damage cracks of more than or equal to 73 percent.
The properties of the self-healing concrete prepared in the following examples are shown in table 1.
Example 1
(1) According to the weight ratio of 58.5: 24: 12: 2.7: weighing vanadium-titanium magnetite tailings, calcium carbonate, kaolinite, iron powder and a mineralizer according to a proportion of 2.8, loading the tailings into an SLC suspension preheater kiln with a daily yield of 5000 tons, calcining the tailings into clinker, and cooling the clinker in a grate cooler at a speed of 35 ℃/min to obtain cooled clinker;
(2) cooling clinker, vanadium titano-magnetite tailings, semi-hydrated gypsum and calcium sulphoaluminate according to the weight ratio of 41: 44: 11: weighing 4 proportions, grinding by wheel milling, rotating the main shaft of the wheel mill at the speed of 35 revolutions per minute, hydrating, and adding water in an amount of 300 milliliters per kilogram of the material to obtain the self-repairing concrete material.
Example 2
(1) According to the weight ratio of 58.7: 23: 13: 2.5: weighing vanadium-titanium magnetite tailings, calcium carbonate, kaolinite, iron powder and a mineralizer according to a proportion of 2.8, loading the tailings into an SLC suspension preheater kiln with a daily yield of 5000 tons, calcining the tailings into clinker, and cooling the clinker in a grate cooler at a speed of 33 ℃/min to obtain cooled clinker;
(2) cooling clinker, vanadium titano-magnetite tailings, semi-hydrated gypsum and calcium sulphoaluminate according to the weight ratio of 42: 43: 12: 3, weighing in proportion, grinding in a wheel mill, and hydrating at the speed of a wheel mill main shaft of 45 revolutions per kilogram, wherein the water adding amount is 300 milliliters per kilogram of the material, so that the self-repairing concrete material is finally obtained.
Example 3
(1) According to the weight ratio of 65.1: 21: 10: 1.8: weighing vanadium-titanium magnetite tailings, calcium carbonate, kaolinite, iron powder and a mineralizer according to a proportion of 2.1, loading the tailings into an SLC suspension preheater kiln with a daily yield of 5000 tons, calcining the tailings into clinker, and cooling the clinker in a grate cooler at a speed of 50 ℃/min to obtain cooled clinker;
(2) cooling clinker, vanadium titano-magnetite tailings, semi-hydrated gypsum and calcium sulphoaluminate according to the weight ratio of 45.1: 39.9: 11.1: 3.9, weighing in proportion, grinding in a wheel mill, and finally hydrating, wherein the rotation speed of a main wheel mill shaft is 42 revolutions per kilogram, and the water adding amount is 300 milliliters per kilogram of the material, so that the self-repairing concrete material is finally obtained.
Example 4
(1) According to the weight ratio of 64.1: 22: 10: 1.8: weighing vanadium-titanium magnetite tailings, calcium carbonate, kaolinite, iron powder and a mineralizer according to a proportion of 2.1, loading the tailings into an SLC suspension preheater kiln with a daily yield of 5000 tons, calcining the tailings into clinker, and cooling the clinker in a grate cooler at a speed of 38 ℃/min to obtain cooled clinker;
(2) cooling clinker, vanadium titano-magnetite tailings, semi-hydrated gypsum and calcium sulphoaluminate according to a proportion of 44.1: 40.9: 11.2: 3.8, weighing in proportion, grinding in a wheel mill, and finally hydrating, wherein the rotation speed of a main wheel mill shaft is 40 r/min, and the water adding amount is 300 ml/kg of material, so that the self-repairing concrete material is finally obtained.
The performance parameters of the self-repairing concrete prepared in the examples 1-4 are shown in Table 1:
TABLE 1
From the table, the self-repairing concrete material prepared by the invention has the compression strength of more than or equal to 338.5MPa, the microhardness of more than or equal to 2.3GPa, the bending strength of more than or equal to 240MPa and the self-repairing rate of vibration damage cracks of more than or equal to 73 percent.
Example 5
(1) According to the weight ratio of 64.1: 22: 9.8: 1.8: weighing vanadium-titanium magnetite tailings, calcium carbonate, kaolinite, iron powder and a mineralizer according to a proportion of 2.3, loading the tailings into an SLC suspension preheater kiln with a daily yield of 5000 tons, calcining the tailings into clinker, and cooling the clinker in a grate cooler at a speed of 43 ℃/min to obtain cooled clinker;
(2) cooling clinker, vanadium titano-magnetite tailings, semi-hydrated gypsum and calcium sulphoaluminate according to the weight ratio of 43.5: 40.3: 12.5: 3.7, weighing in proportion, grinding in a wheel mill, and finally hydrating, wherein the rotation speed of a main shaft of the wheel mill is 39 revolutions per kilogram, and the water adding amount is 300 milliliters per kilogram of the material, so that the self-repairing concrete material is finally obtained.
Example 6
(1) According to the weight ratio of 59.1: 27: 9.8: 1.8: weighing vanadium-titanium magnetite tailings, calcium carbonate, kaolinite, iron powder and a mineralizer according to a proportion of 2.3, loading the tailings into an SLC suspension preheater kiln with a daily yield of 5000 tons, calcining the tailings into clinker, and cooling the clinker in a grate cooler at a speed of 49 ℃/min to obtain cooled clinker;
(2) cooling clinker, vanadium titano-magnetite tailings, semi-hydrated gypsum and calcium sulphoaluminate according to the weight ratio of 42.8: 41: 12.5: 3.7, weighing in proportion, grinding in a wheel mill, and finally hydrating, wherein the rotation speed of a main shaft of the wheel mill is 36 r/min, and the water addition amount is 300 ml/kg of material, so that the self-repairing concrete material is finally obtained.
Example 7
(1) According to the weight ratio of 62.1: 25: 9.8: 1.8: weighing vanadium-titanium magnetite tailings, calcium carbonate, kaolinite, iron powder and a mineralizer according to a proportion of 2.3, loading the tailings into an SLC suspension preheater kiln with a daily yield of 5000 tons, calcining the tailings into clinker, and cooling the clinker in a grate cooler at a speed of 34 ℃/min to obtain cooled clinker;
(2) cooling clinker, vanadium titano-magnetite tailings, semi-hydrated gypsum and calcium sulphoaluminate according to the weight ratio of 42.2: 41.6: 12.5: 3.7, weighing in proportion, grinding in a wheel mill, and finally hydrating, wherein the rotation speed of a main wheel mill shaft is 41 revolutions per kilogram of the material, and the water adding amount is 300 milliliters per kilogram of the material, so that the self-repairing concrete material is finally obtained.
Example 8
(1) According to the weight ratio of 62.8: 24.3: 9.8: 1.8: weighing vanadium-titanium magnetite tailings, calcium carbonate, kaolinite, iron powder and a mineralizer according to a proportion of 2.3, loading the tailings into an SLC suspension preheater kiln with a daily yield of 5000 tons, calcining the tailings into clinker, and cooling the clinker in a grate cooler at a speed of 50 ℃/min to obtain cooled clinker;
(2) cooling clinker, vanadium titano-magnetite tailings, semi-hydrated gypsum and calcium sulphoaluminate according to the weight ratio of 42.9: 41.6: 11.8: 3.7, weighing in proportion, grinding in a wheel mill, and finally hydrating, wherein the rotation speed of a main wheel mill shaft is 42 revolutions per kilogram of the material, and the water adding amount is 300 milliliters per kilogram of the material, so that the self-repairing concrete material is finally obtained.
Example 9
(1) According to the following weight ratio of 57.4: 29: 10: 1.7: weighing vanadium-titanium magnetite tailings, calcium carbonate, kaolinite, iron powder and a mineralizer according to a proportion of 1.9, loading the tailings into an SLC suspension preheater kiln with a daily yield of 5000 tons, calcining the tailings into clinker, and cooling the clinker in a grate cooler at a speed of 30 ℃/min to obtain cooled clinker;
(2) cooling clinker, vanadium titano-magnetite tailings, semi-hydrated gypsum and calcium sulphoaluminate according to the weight ratio of 38.9: 44: 13: weighing at a ratio of 4.1, grinding by wheel milling, rotating the main shaft of the wheel mill at a speed of 35 rpm, hydrating, and adding water in an amount of 300 ml/kg to obtain the self-repairing concrete material.
Example 10
(1) According to the weight ratio of 60.5: 21: 13: 2.7: weighing vanadium-titanium magnetite tailings, calcium carbonate, kaolinite, iron powder and a mineralizer according to a proportion of 2.8, loading the tailings into an SLC suspension preheater kiln with a daily yield of 5000 tons, calcining the tailings into clinker, and cooling the clinker in a grate cooler at a speed of 50 ℃/min to obtain cooled clinker;
(2) cooling clinker, vanadium titano-magnetite tailings, semi-hydrated gypsum and calcium sulphoaluminate according to the weight ratio of 45.1: 41: 10.2: 3.7, weighing in proportion, grinding in a wheel mill, and finally hydrating, wherein the rotation speed of a main wheel mill shaft is 45 revolutions per kilogram of the material, and the water adding amount is 300 milliliters per kilogram of the material, so that the self-repairing concrete material is finally obtained.
The performance parameters of the self-repairing concrete prepared in the examples 5-10 are shown in Table 2:
TABLE 2
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (6)
1. The method for preparing the self-repairing concrete from the vanadium titano-magnetite tailings is characterized by comprising the following steps of:
1) loading vanadium titano-magnetite tailings, a correction raw material and a mineralizer into a dry cement rotary kiln, calcining into clinker, and cooling in a grate cooler to obtain cooled clinker; the correction raw materials comprise calcium carbonate, kaolinite and iron powder, and the mineralizer is a 1:1 mixture of calcium fluoride and dihydrate gypsum;
2) grinding the cooling clinker, the vanadium titano-magnetite tailings, the semi-hydrated gypsum and the calcium sulphoaluminate into powder by a wheel mill, and finally hydrating to finally obtain the self-repairing concrete material;
the vanadium titano-magnetite tailings, calcium carbonate, kaolinite, iron powder and a mineralizer are prepared from the following components in percentage by mass (57.4-65.1): (21-29): (10-13): (1.7-2.7): (1.9-2.8);
the mass percentages of the cooling clinker, the vanadium titano-magnetite tailings, the semi-hydrated gypsum and the calcium sulphoaluminate are (38.9-45.1): (41-44): (10-13): (3.7-4.1).
2. The method for preparing the self-repairing concrete from the vanadium titano-magnetite tailings, according to claim 1, wherein the dry-process cement rotary kiln is a SLC suspension preheater kiln with a daily yield of 5000 tons.
3. The method for preparing the self-repairing concrete from the vanadium titano-magnetite tailings, according to claim 1, is characterized in that the average clinker cooling rate is 30-50 ℃/min.
4. The method for preparing self-repairing concrete from vanadium titano-magnetite tailings as claimed in claim 1, wherein the rotation speed of a wheel milling main shaft is 35-45 rpm.
5. The method for preparing the self-repairing concrete from the vanadium titano-magnetite tailings, which is described in claim 1, wherein the water addition amount of the hydration treatment is 300 ml/kg material.
6. The method for preparing the self-repairing concrete from the vanadium titano-magnetite tailings, according to any one of claims 1 to 5, wherein the compression strength of the prepared self-repairing concrete material is larger than or equal to 338.5MPa, the microhardness is larger than or equal to 2.3GPa, the bending strength is larger than or equal to 240MPa, and the self-repairing rate of the vibration damage crack is larger than or equal to 73%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102515583A (en) * | 2011-11-28 | 2012-06-27 | 峨眉山强华特种水泥有限责任公司 | Method for producing low heat expansive cement |
| CN106587676A (en) * | 2016-12-12 | 2017-04-26 | 攀枝花环业冶金渣开发有限责任公司 | Method for preparing cement clinker ingredients from high Ti-bearing blast furnace slag |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102515583A (en) * | 2011-11-28 | 2012-06-27 | 峨眉山强华特种水泥有限责任公司 | Method for producing low heat expansive cement |
| CN106587676A (en) * | 2016-12-12 | 2017-04-26 | 攀枝花环业冶金渣开发有限责任公司 | Method for preparing cement clinker ingredients from high Ti-bearing blast furnace slag |
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