CN112028508B - Gangue silicate cement clinker and preparation method thereof - Google Patents

Gangue silicate cement clinker and preparation method thereof Download PDF

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CN112028508B
CN112028508B CN202010987776.2A CN202010987776A CN112028508B CN 112028508 B CN112028508 B CN 112028508B CN 202010987776 A CN202010987776 A CN 202010987776A CN 112028508 B CN112028508 B CN 112028508B
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gangue
admixture
cement
claystone
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CN112028508A (en
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刘宏立
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Feixian Yizhou Cement Co ltd
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Feixian Yizhou Cement Co ltd
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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
    • 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
    • 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
    • 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
    • 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
    • C04B7/422—Elements
    • 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
    • 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
    • C04B7/428—Organic materials
    • 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)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention belongs to the technical field of constructional engineering, relates to cement clinker, and more particularly relates to coal gangue silicate cement clinker and a preparation method thereof. The technical points are as follows: the composition comprises the following components in parts by weight: 200-250 parts of limestone, 130-140 parts of coal gangue admixture, 80-90 parts of iron ore powder, 10-15 parts of aggregate, 30-40 parts of excitant and 5-10 parts of aluminum ash. According to the gangue silicate cement clinker and the preparation method thereof provided by the invention, the prepared gangue silicate cement clinker can effectively improve the early strength of cement, reduce the water demand of the cement, reduce the early shrinkage of the cement in the cement curing process and delay the heat release of the cement, thereby reducing the late shrinkage of the cement curing, improving the 3d strength and the 28d strength of the cement and avoiding the occurrence of alkali-aggregate reaction.

Description

Gangue silicate cement clinker and preparation method thereof
Technical Field
The invention belongs to the technical field of constructional engineering, relates to cement clinker, and more particularly relates to coal gangue silicate cement clinker and a preparation method thereof.
Background
The cement is a cementing material which is prepared by mixing and grinding limestone, a silicon-aluminum material, an iron material and the like according to a certain proportion, then calcining the mixture at high temperature to form clinker, adding a mixed material, a retarder and other materials into the clinker, and grinding the clinker to a certain fineness. With the continuous development of the construction industry, the demand of cement is higher and higher. The cement clinker is an important component of the cement, the material property of the cement clinker determines the material property of the cement, but the cement clinker in the prior art usually emits a large amount of heat in the hydration process of the cement, so that the cement is shrunk early, the temperature rise inside the large-volume cement is caused to cause cracks, and the alkali-aggregate reaction is easy to occur.
In view of the defects of the existing cement clinker, the inventor develops a gangue Portland cement clinker and a preparation method thereof by matching theoretical analysis and research innovation based on years of abundant experience and professional knowledge of the materials, and the prepared gangue Portland cement clinker can effectively improve the early strength of cement, reduce the water demand of the cement, reduce the early shrinkage of the cement in the cement curing process and delay the heat release of the cement, thereby reducing the late shrinkage of the cement curing, improving the 3d strength and 28d strength of the cement and avoiding the occurrence of alkali aggregate reaction.
Disclosure of Invention
The invention aims to provide a gangue silicate cement clinker which can effectively improve the early strength of cement, reduce the water demand of the cement, reduce the early shrinkage of the cement in the cement curing process and delay the heat release of the cement, thereby reducing the late shrinkage of the cement curing, improving the 3d strength and the 28d strength of the cement and avoiding the occurrence of alkali-aggregate reaction.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides a gangue Portland cement clinker which comprises the following components in parts by weight: 200-250 parts of limestone, 130-140 parts of coal gangue admixture, 80-90 parts of iron ore powder, 10-15 parts of aggregate, 30-40 parts of excitant and 5-10 parts of aluminum ash.
Further, the gangue admixture is a claystone gangue admixture. The coal gangue is divided into four types in total: the composition of each type of gangue has large difference, wherein kaolinite in the claystone gangue undergoes dehydration reaction and is converted into metakaolinite, and the metakaolinite is decomposed into gamma-Al at 600-700 DEG C2O3And amorphous SiO2And more tricalcium silicate is generated with limestone at high temperature, the increase of the content of the tricalcium silicate can delay the heat release time of cement hydration and reduce the early shrinkage of the cement.
Further, the claystone gangue admixture is an activated claystone gangue admixture activated by magnesium zincate. The claystone gangue admixture activated by magnesium zincate generates an aluminum-magnesium stone crystal with aluminum ash at high temperature, and the defects of an aluminum-magnesium stone crystal framework are filled with zinc, so that the micro-expansion rate of the aluminum-magnesium stone crystal is improved, the shrinkage of cement in middle and late stages is resisted, and the 28d strength of the cement is improved.
Further, the method for activating the magnesium zincate comprises the following operation steps:
s1, blending magnesium zincate and water according to the mass ratio of 1: 20-25, and obtaining magnesium zincate spraying liquid after 30 min;
s2, uniformly spraying the spraying liquid obtained in the step S1 on the surface of the claystone gangue admixture;
and S3, heating the claystone gangue admixture to 40-50 ℃ for 20-40 min to obtain the activated claystone gangue admixture. After the magnesium zincate is sprayed on the surface of the claystone gangue admixture, the magnesium zincate can rapidly and uniformly enter into the claystone gangue crystal in the sintering process to generate the aluminum-magnesium crystal.
Further, the excitant comprises the following components in parts by weight: 20-30 parts of Lewis acid-base pairs, 5-10 parts of copper powder and 5-10 parts of nano cobalt powder. Under the action of the Lewis acid-base pair, the copper powder, the nano cobalt powder and the aluminum ash act together to form Al-Cu-Co metal crystal grains, so that the Al-Cu-Co metal crystal grains have the advantages of high strength and high toughness, and can be doped into cement clinker to effectively fill a skeleton structure of cement, construct a more stable cement pore structure together with other crystal grains, and improve the early strength of the cement.
Further, the Lewis acid-base pair is any one of nickel sulfamate tetrahydrate, guanidine nitrate or sodium trinitrobenzene sulfonate. The addition of the three lewis acid-base pairs can inhibit the occurrence of alkali-aggregate reactions.
Furthermore, the aggregate contains 10-20% of peanut shell gel particles by mass, the particle size of the particles is 50-200 mu m, and the balance is mine red sandstone interlayer material. The peanut shell gel particles are doped in the aggregate, the connection between the aggregate and iron ore powder and other crystal grains is tighter through the net structure before firing, the peanut shell gel particles are carbonized into carbon dioxide in the firing process to generate calcium carbonate and magnesium carbonate, the alkali-aggregate reaction is inhibited, and the final setting time of cement is shortened. The red sandstone interlayer material of the mine and the claystone gangue act together at high temperature to generate strong alteration effect, so that the lattice distortion degree of the surface of the material is increased, and the sulfate corrosion resistance of the cement is improved.
The second purpose of the invention is to provide a preparation method of the gangue Portland cement clinker, which has the same function.
The invention provides a preparation method of gangue Portland cement clinker, which comprises the following operation steps:
A1. grinding the coal gangue to obtain a coal gangue admixture;
A2. adding 200-250 parts of limestone, 130-140 parts of gangue admixture, 10-15 parts of aggregate and 80-90 parts of iron ore powder into a ball mill, ball-milling for 10-15 min, adding 5-10 parts of aluminum ash, and continuing ball-milling for 10-20 s;
A3. adding 30-40 parts of exciting agent into a ball mill, continuously milling for 30-40 min, stopping milling, and sieving with a 80-90-mesh sieve to obtain raw material powder;
A4. preheating raw material powder by a kiln tail preheater, feeding the raw material powder into a decomposing furnace, heating the raw material powder to 800-1000 ℃, then feeding the raw material powder into a rotary kiln, calcining the raw material powder at 1300-1450 ℃, and cooling the calcined high-temperature material to 60-80 ℃ by a grate cooler to obtain the gangue Portland cement clinker.
Preferably, in step a3, the ball milling is stopped, and then the mixture is allowed to stand for 30min and sieved. Standing for 30min can enable the excitant and the aluminum ash to form a primary reaction after being fully contacted.
Preferably, in the grinding process of step a1, the coal gangue admixture is activated by magnesium zincate.
In conclusion, the invention has the following beneficial effects:
according to the gangue silicate cement clinker and the preparation method thereof provided by the invention, the prepared gangue silicate cement clinker can effectively improve the early strength of cement, reduce the water demand of the cement, reduce the early shrinkage of the cement in the cement curing process and delay the heat release time of the cement, thereby reducing the late shrinkage of the cement curing, improving the 3d strength and 28d strength of the cement and avoiding the occurrence of alkali aggregate reaction.
Detailed Description
To further illustrate the technical means and effects adopted by the present invention to achieve the predetermined objects, the detailed description of the embodiments, features and effects of the gangue silicate cement clinker and the preparation method thereof according to the present invention are as follows.
Example 1: 200-250 parts of limestone, 130-140 parts of gangue admixture, 80-90 parts of iron ore powder, 10-15 parts of aggregate, 10-20 parts of Lewis acid-base pair, 5-10 parts of copper powder, 5-10 parts of nano cobalt powder and 5-10 parts of aluminum ash.
The preparation method comprises the following operation steps:
A1. grinding the coal gangue to obtain a coal gangue admixture;
A2. adding 200-250 parts of limestone, 130-140 parts of gangue admixture, 10-15 parts of aggregate and 80-90 parts of iron ore powder into a ball mill, ball-milling for 10-15 min, adding 5-10 parts of aluminum ash, and continuing ball-milling for 10-20 s;
A3. adding 30-40 parts of exciting agent into a ball mill, continuously milling for 30-40 min, stopping milling, and sieving with a 80-90-mesh sieve to obtain raw material powder;
A4. preheating raw material powder by a kiln tail preheater, feeding the raw material powder into a decomposing furnace, heating the raw material powder to 800-1000 ℃, then feeding the raw material powder into a rotary kiln, calcining the raw material powder at 1300-1450 ℃, and cooling the calcined high-temperature material to 60-80 ℃ by a grate cooler to obtain the gangue Portland cement clinker.
Example 2: 200 parts of limestone, 130 parts of claystone gangue admixture, 80 parts of iron ore powder, 30 parts of aggregate, 20 parts of nickel sulfamate tetrahydrate, 5 parts of copper powder, 10 parts of nano cobalt powder and 5 parts of aluminum ash.
The preparation method comprises the following operation steps:
A1. grinding the claystone gangue to obtain a claystone gangue admixture;
A2. adding 200 parts of limestone, 130 parts of claystone gangue admixture, 30 parts of aggregate and 80 parts of iron ore powder into a ball mill, ball-milling for 10-15 min, adding 5 parts of aluminum ash, and continuing ball-milling for 10-20 s;
A3. adding 20 parts of nickel sulfamate tetrahydrate, 5 parts of copper powder and 10 parts of nano cobalt powder into a ball mill, continuously ball-milling for 30-40 min, stopping ball-milling, and sieving with a sieve of 80-90 meshes to obtain raw material powder;
A4. preheating raw material powder by a kiln tail preheater, feeding the raw material powder into a decomposing furnace, heating the raw material powder to 800-1000 ℃, then feeding the raw material powder into a rotary kiln, calcining the raw material powder at 1300-1450 ℃, and cooling the calcined high-temperature material to 60-80 ℃ by a grate cooler to obtain the gangue Portland cement clinker.
Example 3: 200 parts of limestone, 130 parts of claystone gangue admixture, 80 parts of iron ore powder, 30 parts of aggregate, 20 parts of nickel sulfamate tetrahydrate, 5 parts of copper powder, 10 parts of nano cobalt powder and 5 parts of aluminum ash.
The preparation method comprises the following operation steps:
A1. grinding the coal gangue to obtain a coal gangue admixture;
A2. adding 200 parts of limestone, 130 parts of gangue admixture, 30 parts of aggregate and 80 parts of iron ore powder into a ball mill for ball milling for 10-15 min, adding 5 parts of aluminum ash and continuing ball milling for 10-20 s;
A3. adding 20 parts of nickel sulfamate tetrahydrate, 5 parts of copper powder and 10 parts of nano cobalt powder into a ball mill, continuously ball-milling for 30-40 min, stopping ball-milling, and sieving with a sieve of 80-90 meshes to obtain raw material powder;
A4. preheating raw material powder by a kiln tail preheater, feeding the raw material powder into a decomposing furnace, heating the raw material powder to 800-1000 ℃, then feeding the raw material powder into a rotary kiln, calcining the raw material powder at 1300-1450 ℃, and cooling the calcined high-temperature material to 60-80 ℃ by a grate cooler to obtain the gangue Portland cement clinker.
Wherein the claystone gangue admixture is an activated claystone gangue admixture activated by magnesium zincate. The method for activating the magnesium zincate comprises the following operation steps:
s1, blending magnesium zincate and water according to the mass ratio of 1: 20-25, and obtaining magnesium zincate spraying liquid after 30 min;
s2, uniformly spraying the spraying liquid obtained in the step S1 on the surface of the claystone gangue admixture;
and S3, heating the claystone gangue admixture to 40-50 ℃ for 20-40 min to obtain the activated claystone gangue admixture.
Example 4: 200 parts of limestone, 130 parts of claystone gangue admixture, 80 parts of iron ore powder, 6 parts of peanut shell gel particles, 24 parts of mine red sandstone interlayer material, 20 parts of guanidine nitrate, 5 parts of copper powder, 10 parts of nano cobalt powder and 5 parts of aluminum ash.
The preparation method comprises the following operation steps:
A1. grinding the coal gangue to obtain a coal gangue admixture;
A2. adding 200 parts of limestone, 130 parts of gangue admixture, 6 parts of peanut shell gel particles, 24 parts of mine red sandstone interlayer material and 80 parts of iron ore powder into a ball mill, performing ball milling for 10-15 min, adding 5 parts of aluminum ash, and continuing ball milling for 10-20 s;
A3. adding 20 parts of guanidine nitrate, 5 parts of copper powder and 10 parts of nano cobalt powder into a ball mill, continuously ball-milling for 30-40 min, stopping ball-milling, and sieving with a 80-90-mesh sieve to obtain raw material powder;
A4. preheating raw material powder by a kiln tail preheater, feeding the raw material powder into a decomposing furnace, heating the raw material powder to 800-1000 ℃, then feeding the raw material powder into a rotary kiln, calcining the raw material powder at 1300-1450 ℃, and cooling the calcined high-temperature material to 60-80 ℃ by a grate cooler to obtain the gangue Portland cement clinker.
Wherein the claystone gangue admixture is an activated claystone gangue admixture activated by magnesium zincate. The method for activating the magnesium zincate comprises the following operation steps:
s1, blending magnesium zincate and water according to the mass ratio of 1:20, and obtaining magnesium zincate spraying liquid after 30 min;
s2, uniformly spraying the spraying liquid obtained in the step S1 on the surface of the claystone gangue admixture;
and S3, heating the claystone gangue admixture to 40-50 ℃ for 20-40 min to obtain the activated claystone gangue admixture.
Example 5: 200 parts of limestone, 130 parts of claystone gangue admixture, 80 parts of iron ore powder, 6 parts of peanut shell gel particles, 24 parts of mine red sandstone interlayer material, 20 parts of guanidine nitrate, 5 parts of copper powder, 10 parts of nano cobalt powder and 5 parts of aluminum ash.
The preparation method comprises the following operation steps:
A1. grinding the coal gangue to obtain a coal gangue admixture;
A2. adding 200 parts of limestone, 130 parts of gangue admixture, 6 parts of peanut shell gel particles, 24 parts of mine red sandstone interlayer material and 80 parts of iron ore powder into a ball mill, performing ball milling for 10-15 min, adding 5 parts of aluminum ash, and continuing ball milling for 10-20 s;
A3. adding 20 parts of guanidine nitrate, 5 parts of copper powder and 10 parts of nano cobalt powder into a ball mill, continuously ball-milling for 30-40 min, stopping ball-milling, standing for 30min, and sieving by a sieve of 80-90 meshes to obtain raw material powder;
A4. preheating raw material powder by a kiln tail preheater, feeding the raw material powder into a decomposing furnace, heating the raw material powder to 800-1000 ℃, then feeding the raw material powder into a rotary kiln, calcining the raw material powder at 1300-1450 ℃, and cooling the calcined high-temperature material to 60-80 ℃ by a grate cooler to obtain the gangue Portland cement clinker.
Wherein the claystone gangue admixture is an activated claystone gangue admixture activated by magnesium zincate. The method for activating the magnesium zincate comprises the following operation steps:
s1, blending magnesium zincate and water according to the mass ratio of 1: 20-25, and obtaining magnesium zincate spraying liquid after 30 min;
s2, uniformly spraying the spraying liquid obtained in the step S1 on the surface of the claystone gangue admixture;
and S3, heating the claystone gangue admixture to 40-50 ℃ for 20-40 min to obtain the activated claystone gangue admixture.
Example 6: 200 parts of limestone, 130 parts of claystone gangue admixture, 80 parts of iron ore powder, 6 parts of peanut shell gel particles, 24 parts of mine red sandstone interlayer material, 20 parts of trinitrobenzene sodium sulfonate, 5 parts of copper powder, 10 parts of nano cobalt powder and 5 parts of aluminum ash.
The preparation method comprises the following operation steps:
A1. grinding the coal gangue to obtain a coal gangue admixture;
A2. adding 200 parts of limestone, 130 parts of gangue admixture, 6 parts of peanut shell gel particles, 24 parts of mine red sandstone interlayer material and 80 parts of iron ore powder into a ball mill, performing ball milling for 10-15 min, adding 5 parts of aluminum ash, and continuing ball milling for 10-20 s;
A3. adding 20 parts of trinitrobenzene sodium sulfonate, 5 parts of copper powder and 10 parts of nano cobalt powder into a ball mill, continuously ball-milling for 30-40 min, stopping ball-milling, standing for 30min, and sieving by a sieve of 80-90 meshes to obtain raw material powder;
A4. preheating raw material powder by a kiln tail preheater, feeding the raw material powder into a decomposing furnace, heating the raw material powder to 800-1000 ℃, then feeding the raw material powder into a rotary kiln, calcining the raw material powder at 1300-1450 ℃, and cooling the calcined high-temperature material to 60-80 ℃ by a grate cooler to obtain the gangue Portland cement clinker.
Wherein the claystone gangue admixture is an activated claystone gangue admixture activated by magnesium zincate. The method for activating the magnesium zincate comprises the following operation steps:
s1, blending magnesium zincate and water according to the mass ratio of 1:20, and obtaining magnesium zincate spraying liquid after 30 min;
s2, uniformly spraying the spraying liquid obtained in the step S1 on the surface of the claystone gangue admixture;
and S3, heating the claystone gangue admixture to 40-50 ℃ for 20-40 min to obtain the activated claystone gangue admixture.
The liquid cement grinding aid obtained in the examples 1 to 6 is tested for the grinding time, sulfur trioxide, water consumption for standard consistency, setting time, 3d strength and 28d strength of cement clinker according to the regulations of the national standard universal portland cement and the requirements of the building material industry standard GB/T26748-2011, and natural gypsum and various mixed materials required for testing are randomly sampled from a cement grinding head (or a storage yard) respectively, crushed to a particle size of less than 7mm, dried and uniformly mixed. The test results are shown in the following table:
TABLE 1 test results for cement clinker
Example 1 Example 2 Example 3 Example 4 Example 5 Example 6
Water consumption for standard consistency 28.2% 28.4% 27.3% 27.5% 27.2% 27.5%
Final setting time 320min 325min 310min 270min 275min 276min
3d strength 34.7MPa 34.2MPa 35.3MPa 40.1MPa 42.0MPa 42.4MPa
28d strength 58.7MPa 61.3MPa 63.5MPa 64.0MPa 68.1MPa 67.6MPa
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (4)

1. The gangue silicate cement clinker is characterized by comprising the following components in parts by weight: 200-250 parts of limestone, 130-140 parts of gangue admixture, 80-90 parts of iron ore powder, 10-15 parts of aggregate, 30-40 parts of excitant and 5-10 parts of aluminum ash; the gangue admixture is a claystone gangue admixture; the claystone gangue admixture is an activated claystone gangue admixture activated by magnesium zincate; the aggregate contains 10-20% of peanut shell gel particles by mass, the particle size of the particles is 50-200 mu m, and the balance is mine red sandstone interlayer material; the method for activating the magnesium zincate comprises the following operation steps:
s1, blending magnesium zincate and water according to the mass ratio of 1: 20-25, and obtaining magnesium zincate spraying liquid after 30 min;
s2, uniformly spraying the spraying liquid obtained in the step S1 on the surface of the claystone gangue admixture;
s3, heating the claystone gangue admixture to 40-50 ℃ for 20-40 min to obtain an activated claystone gangue admixture, wherein the excitant comprises the following components in parts by weight: 10-20 parts of Lewis acid-base pairs, 5-10 parts of copper powder and 5-10 parts of nano cobalt powder; the Lewis acid-base pair is any one of nickel sulfamate tetrahydrate or sodium trinitrobenzene sulfonate.
2. A process for producing a coal gangue Portland cement clinker as defined in claim 1, comprising the following operating steps:
A1. grinding the coal gangue to obtain a coal gangue admixture;
A2. adding 200-250 parts of limestone, 130-140 parts of gangue admixture, 10-15 parts of aggregate and 80-90 parts of iron ore powder into a ball mill, ball-milling for 10-15 min, adding 5-10 parts of aluminum ash, and continuing ball-milling for 10-20 s;
A3. adding 30-40 parts of exciting agent into a ball mill, continuously milling for 30-40 min, stopping milling, and sieving with a 80-90-mesh sieve to obtain raw material powder;
A4. preheating raw material powder by a kiln tail preheater, feeding the raw material powder into a decomposing furnace, heating the raw material powder to 800-1000 ℃, then feeding the raw material powder into a rotary kiln, calcining the raw material powder at 1300-1450 ℃, and cooling the calcined high-temperature material to 60-80 ℃ by a grate cooler to obtain the gangue Portland cement clinker.
3. The method for preparing coal gangue Portland cement clinker as claimed in claim 2, wherein in step A3, the ball milling is stopped, and the clinker is sieved after standing for 30 min.
4. The method for preparing a coal gangue silicate cement clinker as defined in claim 2 or 3, wherein said coal gangue admixture is subjected to magnesium zincate activation during the grinding process of step A1.
CN202010987776.2A 2020-09-18 2020-09-18 Gangue silicate cement clinker and preparation method thereof Expired - Fee Related CN112028508B (en)

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