CN115057635B

CN115057635B - High-strength cement clinker and production process thereof

Info

Publication number: CN115057635B
Application number: CN202210829145.7A
Authority: CN
Inventors: 胡秀川; 王志立; 安江娜
Original assignee: Hebei Dingxing Cement Co ltd
Current assignee: Hebei Dingxing Cement Co ltd
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2023-05-26
Anticipated expiration: 2042-07-14
Also published as: CN115057635A

Abstract

The application relates to the technical field of cement clinker, and in particular discloses high-strength cement clinker and a production process thereof, wherein the high-strength cement clinker comprises the following raw materials in parts by weight: the material comprises the following raw materials in parts by weight: 80-85% of fine limestone powder, 2-6% of fly ash, 3-5% of copper slag, 1-5% of modified nano montmorillonite, 2-5% of phosphogypsum, 1-3% of carbide slag and 1-2% of silica; the modified nano montmorillonite is obtained by modifying and modifying gamma-aminopropyl triethoxysilane. The highest compressive strength and the highest flexural strength of the cement clinker 3d obtained by the method are 41.7MPa and 7.1MPa respectively; the highest compressive strength and the highest flexural strength of 28d are 72.1MPa and 10.3MPa respectively, and the highest saturation reaches 0.98, so that the compressive strength and the flexural strength of the cement clinker are improved.

Description

High-strength cement clinker and production process thereof

Technical Field

The application relates to the technical field of cement clinker, in particular to high-strength cement clinker and a production process thereof.

Background

The cement clinker is a semi-finished product of cement obtained by taking limestone, clay and iron as main raw materials, preparing raw materials according to a proper proportion, sintering the raw materials into clinker at high temperature and cooling the clinker, and is widely applied to civil engineering, water conservancy, national defense and other projects. With the continuous development of economy and society, people have higher and higher quality requirements on various large projects, and the quality of cement clinker is an important ring for guaranteeing the project quality.

In the related art, the electroslag stone is added into the raw material of the cement clinker so as to recycle the electroslag stone, thus reducing the environmental pollution, but the prepared cement clinker has lower strength after solidification, and the high-strength cement clinker is the basis for preparing high-strength and high-performance concrete, so that the specific construction requirements are difficult to meet.

Disclosure of Invention

In order to improve the strength of the cured cement clinker, the application provides a high-strength cement clinker and a production process thereof.

In a first aspect, the present application provides a high-strength cement clinker, which adopts the following technical scheme:

the high-strength cement clinker comprises the following raw materials in percentage by weight: 80-85% of fine limestone powder, 2-6% of fly ash, 3-5% of copper slag, 1-5% of modified nano montmorillonite, 2-5% of phosphogypsum, 1-3% of carbide slag and 1-2% of silica; the modified nano montmorillonite is obtained by modifying and modifying gamma-aminopropyl triethoxysilane.

By adopting the technical scheme, the high fine limestone powder contains a large amount of calcium oxide, has higher density, has higher acceleration effect, activity effect, morphological effect and excellent micro-aggregate effect, and can improve the early strength of the cement clinker and improve the workability and water retention of the cement clinker.

The alumina content of the fly ash is more than 30%, the hydration activity is good, and the strength and the durability of the cement clinker can be improved by adding a proper amount of the fly ash.

The addition of 40% of ferric oxide in the copper slag can promote solid phase reaction, accelerate the formation of clinker and the absorption of free calcium oxide, and improve the strength of cement clinker; in addition, trace elements contained in the copper slag can promote the sintering of the clinker and improve the combustibility of the cement clinker.

Modified nano montmorillonite is prepared by modifying and modifying gamma-aminopropyl triethoxysilane, so that the nano montmorillonite can be prevented from agglomerating during dispersion, and the dispersion uniformity of the nano montmorillonite is improved. Thereby playing the role of the nano montmorillonite in reducing the free calcium oxide in the cement clinker, reducing the calcination temperature of the cement clinker and improving the strength of the cement clinker.

Phosphogypsum is added as an ore agent, so that the bond energy among reactant particles is reduced, the chemical activity of the phosphogypsum is improved, the decomposition of calcium carbonate is accelerated, the reaction capacity of silicon dioxide and calcium oxide is enhanced, the phosphogypsum can participate in a solid phase in the clinker firing process, and the firing temperature is reduced; the viscosity and surface tension of the cement clinker can be changed, which is helpful for the diffusion of calcium ions and promotes the conversion of dicalcium silicate and tricalcium silicate. In addition, the phosphogypsum can also prevent the quick setting phenomenon of the cement clinker.

The main component of the carbide slag is calcium hydroxide, the chemical component of the carbide slag contains up to 70 percent of calcium oxide, and the calcium content of the carbide slag is high, so that the carbide slag can replace part of limestone to be added, has good sedimentation property, and improves the sintering property of cement clinker; in addition, the carbide slag is industrial waste slag generated in the production of polyvinyl chloride by a carbide method, so that the carbide slag waste is treated, economic benefits are brought, and the purpose is achieved.

The silica contains a large amount of silicon, and has the advantages of low density, strong cohesiveness, high adhesive force and difficult sedimentation, and the addition of the silica reduces the alkali content in the cement clinker, so that the growth of the later strength of the cement is ensured, the hydration heat is low, the adjustment capability of later cement grinding is greatly improved, the production fluctuation is reduced, and the quality and stability of the cement are improved.

As preferable: the specific preparation method of the modified nano montmorillonite comprises the following steps: montmorillonite and gamma-aminopropyl triethoxysilane are mixed according to the volume ratio of 1: (2-3) mixing, stirring uniformly, refluxing and stirring at 70-90 ℃ for 8 hours for reaction, filtering, collecting solid, cleaning by ethanol, drying and grinding to the particle size of 40-60nm to obtain the modified nano montmorillonite.

By adopting the technical scheme, the aminosilane coupling agent is adopted to modify the nano montmorillonite, so that the dispersion uniformity of the nano montmorillonite is improved, the content of free calcium oxide in the cement clinker is further improved and reduced, and the strength of the cement clinker is further improved.

As preferable: the raw materials of the high-strength cement clinker also comprise 1-3% of diethanol monoisopropanolamine, and the diethanol monoisopropanolamine is added and uniformly mixed after calcination and cooling.

By adopting the technical scheme, the diethanol monoisopropanolamine can simultaneously enhance the early-stage strength and the later-stage strength of the cement clinker. After cooling, the mixture is added, so that the heat decomposition failure of the diethanol monoisopropanolamine caused by high-temperature calcination can be avoided.

As preferable: the high-strength cement clinker raw material also comprises 0.2-0.5% of fluorine-sulfur mineralizer.

By adopting the technical scheme, the fluosulphur mineralizer can improve the combustibility of cement clinker, promote carbonate decomposition, change the liquid phase property, reduce the liquid phase appearance temperature, increase the liquid phase quantity, reduce the liquid phase viscosity, create good conditions for the cement clinker to generate tricalcium silicate, also generate early strength minerals, improve the lime saturation coefficient of cement raw materials, reduce the free calcium oxide of the clinker and improve the strength of the cement clinker.

As preferable: the weight ratio of the fluorine sulfur mineralizer to the carbide slag is 1: (6-12).

By adopting the technical scheme, the weight percentage ratio of the fluorine sulfur mineralizer to the carbide slag is further adjusted, the combustibility of the cement raw material is improved, the improvement effect is relatively enhanced along with the increase of the doping amount of the carbide slag and the fluorine sulfur mineralizer in a certain range, the formation of tricalcium silicate in the cement clinker is facilitated, but the excessive use of the carbide slag and the fluorine sulfur mineralizer can reduce the tricalcium silicate content in the cement clinker and increase the tetracalcium aluminoferrite, so that the doping amount of the fluorine sulfur mineralizer and the carbide slag needs to be adjusted.

As preferable: the high-strength cement clinker raw material also comprises 2-3% of barium sulfate and 2-3% of barium oxide.

By adopting the technical scheme, the barium sulfate is added, so that alkali can be sulfated, alkali can be effectively prevented from entering the clinker, the combustibility of the cement raw material can be improved, the activation effect is stronger, and the early strength of the cement is improved; in addition, the barium sulfate can also obviously reduce the high-temperature liquid phase viscosity, promote perfect crystallization and further improve the strength of cement clinker.

The barium oxide can reduce the liquid phase appearance temperature, the liquid phase viscosity and improve the liquid phase quantity, the free calcium oxide is added for absorption, the firing energy consumption is reduced, the barium oxide is doped to increase the rate constant of the formation of tricalcium silicate minerals in the cement clinker, the activation energy of reaction formation is reduced, the formation rate of clinker minerals is accelerated, the strength of the cement clinker is improved, and the firing time is shortened.

Meanwhile, barium oxide and barium sulfate are doped to promote the formation of tricalcium silicate minerals in the cement clinker, promote crystal development, improve crystal structure and further improve the strength of the cement clinker.

In a second aspect, the present application provides a method for preparing a high-strength cement clinker, which is specifically implemented by the following technical scheme:

the preparation method of the high-strength cement clinker comprises the following operation steps:

mixing the raw materials of the cement clinker, grinding to 70-90 mu m of particle size, homogenizing to obtain cement raw material powder;

calcining the cement raw meal powder at 1450-1700 ℃ for 30-40min, and cooling to obtain cement clinker.

As preferable: the cement raw meal is incubated at 950 ℃ for 30min before calcination and 120min after calcination.

By adopting the technical scheme, the high temperature gradient is adopted during the calcination of the cement raw material powder, so that newly generated calcium oxide has large lattice defects, is easy to react with silica bonds, silicate minerals are generated, calcium oxide is absorbed completely, the formation of tricalcium silicate is promoted, the strength of cement clinker is improved, and the calcination time can be reduced.

As preferable: the cooling adopts rapid cooling, and the cooling speed is 120 ℃/min.

By adopting the technical scheme, quick cooling is adopted for cooling, the crystal transformation reaction of tricalcium silicate can be avoided by high-temperature quick cooling, the decomposition of tricalcium silicate is prevented, the content of tricalcium silicate in cement clinker is improved, and the strength of cement clinker is improved.

In summary, the present application includes at least one of the following beneficial technical effects:

(1) The type and the doping amount of the high-strength cement clinker are controlled, so that the highest compressive strength and the highest flexural strength of the cement clinker 3d are 28.5MPa and 5.6MPa respectively; the highest compressive strength and the highest flexural strength of the 28d cement clinker are 62.4MPa and 6.5MPa respectively; the saturation reaches 0.93, and the compressive strength and the flexural strength of the cement clinker are improved.

(2) According to the method, the diethanol monoisopropanolamine is added into the original cement clinker, and the mixing amount of the diethanol monoisopropanolamine is regulated, so that the compressive strength and the flexural strength of the cement clinker 3d are respectively 31.8MPa and 6.0MPa; the compressive strength and the flexural strength of the 28d cement clinker are 65.1MPa and 7.5MPa respectively; the saturation reaches 0.94, and the strength of the cement clinker can be further improved.

(3) According to the method, the fluosulphur mineralizer is further added into the cement clinker raw material, and the weight percentage content of the fluosulphur mineralizer and the carbide slag is regulated, so that the compressive strength and the flexural strength of the cement clinker 3d are 33.5MPa and 6.9MPa respectively; the compressive strength and the flexural strength of the 28d cement clinker are 68.3MPa and 8.9MPa respectively; further improving the strength of the cement clinker.

(4) According to the method, barium sulfate and barium oxide are further added into the cement clinker raw material, so that the highest compressive strength and the highest flexural strength of the cement clinker 3d are 38.1MPa and 7.0MPa respectively; the highest compressive strength and the highest flexural strength of the 28d cement clinker are 71.2MPa and 10.1MPa respectively; further improving the strength of the cement clinker.

(5) In the preparation method of the cement clinker, the cement raw material powder is preserved for 30min at 950 ℃ before calcination and is preserved for 120min after calcination, and rapid cooling is adopted after calcination, so that the highest compressive strength and the highest flexural strength of the cement clinker 3d are 41.7MPa and 7.1MPa respectively; the highest compressive strength and the highest flexural strength of the 28d cement clinker are 72.1MPa and 10.3MPa respectively; the saturation reaches 0.97, and the strength of the cement clinker is further improved.

Detailed Description

The present application is described in further detail below in connection with specific examples.

The following raw materials are all commercial products, and are fully disclosed in the present application, and should not be construed as limiting the sources of the raw materials. The method comprises the following steps: fine limestone powder with a particle size of 600 meshes; fly ash with particle size of 325 meshes; copper slag with the grain diameter of 0.5-2mm; nano montmorillonite with particle size of 1000 mesh; phosphogypsum with a standard consistency of 50; carbide slag with the grain diameter of 10-20mm; silica with particle size of 30-60mm; the content of the effective substances in the diethanol monoisopropanolamine is 99%; the content of CaF2 in the fluosulfur mineralizer is more than or equal to 98 percent; barium sulfate, cat No. 02; the content of the effective substances of the barium oxide is 99 percent.

Example 1

The high strength cement clinker of example 1 is obtained by the following operating steps:

mixing montmorillonite and gamma-aminopropyl triethoxysilane according to the mixing amount of table 1 at volume ratio of 1:2, stirring uniformly, refluxing and stirring at 80deg.C for 8 hr to react, filtering, collecting solid, cleaning with ethanol, oven drying, and grinding to particle diameter of 50nm to obtain modified nano montmorillonite;

mixing cement clinker high fine limestone powder, fly ash, copper slag, modified nano montmorillonite, phosphogypsum, carbide slag and silica,

grinding to a particle size of 80 mu m, homogenizing to obtain cement raw material powder;

calcining the cement raw meal powder at 1450 ℃ for 35min, and cooling to obtain cement clinker.

Examples 2 to 5

The high-strength cement clinker of examples 2 to 5 is identical to the preparation method and the raw material type of example 1, except that the blending amounts of the raw materials are different, and the details are shown in Table 1.

TABLE 1 examples 1-5 high-strength Cement clinker each raw material element blending amount (unit: kg)

Example 6

The plant hollow capsules of example 6 are identical to the preparation method and the raw material mixing amount of example 3, except that 0.7kg of diethanol monoisopropanolamine is also included in the high-strength cement clinker, and the specific mixing amount is shown in Table 2.

Examples 7 to 8

The high-strength cement clinker of examples 7 to 8 was identical to the preparation method of example 6, except that the blending amounts of the respective raw materials in the high-strength cement clinker were different, and the details are shown in Table 2.

Table 2 examples 6-8 high-strength Cement clinker blending amount (unit: kg)

Raw materials	Example 6	Example 7	Example 8
				High fine limestone powder	81	80	79
Fly ash	4	4	4
				Copper slag	4	4	4
Modified nano montmorillonite	3	3	3
				Phosphogypsum	3.5	3.5	3.5
Carbide slag	2	2	2
				Silica (silica)	1.5	1.5	1.5
Diethanol monoisopropanolamine	1	2	3

Example 9

The preparation method and the raw material mixing amount of the high-strength cement clinker of the embodiment 9 are completely the same as those of the embodiment 3, except that the high-strength cement clinker also comprises a fluorine sulfur mineralizer, and the specific mixing amount is shown in the table 3.

Examples 10 to 12

The high-strength cement clinker of examples 10 to 12 was identical to the preparation method of example 9, except that the blending amounts of the respective raw materials in the high-strength cement clinker were different, and the details are shown in Table 3.

TABLE 3 mixing amount (unit: kg) of raw materials of high-strength cement clinker of examples 9-12

Example 13

The preparation method and the mixing amount of the high-strength cement clinker of the embodiment 13 are completely the same as those of the embodiment 10, except that the high-strength cement clinker also comprises 2kg of diethanol monoisopropanolamine, the dosage of the high fine limestone powder is 79.75kg, and the types and the mixing amount of the other raw materials are completely the same as those of the embodiment 10.

Example 14

The preparation method and the raw material mixing amount of the high-strength cement clinker of the embodiment 14 are completely the same as those of the embodiment 3, except that the high-strength cement clinker also comprises barium sulfate and barium oxide, and the specific mixing amount is shown in the table 4.

Examples 15 to 18

The high-strength cement clinker of examples 15 to 18 was identical to the preparation method of example 14, except that the blending amounts of the respective raw materials of the high-strength cement clinker were different, and the details are shown in Table 4.

TABLE 4 mixing amount (unit: kg) of raw materials of high-strength cement clinker of examples 14 to 18

Example 19

The high-strength cement clinker of example 19 is identical to the preparation method and the blending amount of the raw materials of example 17, except that 2kg of diethanol monoisopropanolamine is also included in the high-strength cement clinker, the dosage of the high fine limestone powder is 74.5kg, and the types and the blending amount of the other raw materials are identical to those of example 17.

Example 20

The preparation method and the raw material mixing amount of the high-strength cement clinker of the embodiment 20 are completely the same as those of the embodiment 19, except that 0.25kg of fluorine-sulfur mineralizer is also included in the high-strength cement clinker, the amount of carbide slag is 2kg, the amount of high-fine limestone powder is 74.25kg, and the types and the mixing amount of the other raw materials are completely the same as those of the embodiment 19.

Example 21

The high-strength cement clinker of example 21 is identical in the blending amount and kind of the raw materials of example 20 except that the cement raw meal is kept at 950 ℃ for 30min before calcination and at 120min after calcination, and the rest of the preparation method is identical to that of example 19.

Example 22

The high-strength cement clinker of example 22 is identical in the amount and kind of raw materials as in example 21, except that rapid cooling is adopted for cooling after calcination of the cement raw material at a cooling rate of 120 deg.c/min, and the remaining preparation method is identical to that of example 19.

Comparative example 1

The high strength cement clinker of comparative example 1 is identical to the preparation method of example 1, except that: the modified nano montmorillonite in the high-strength cement clinker raw material is replaced by nano montmorillonite, and the rest raw materials and the mixing amount are the same as those in the example 1.

Comparative example 2

The high strength cement clinker of comparative example 2 is identical to the preparation method of example 1, except that: the high fine limestone powder in the high-strength cement clinker raw material is replaced by limestone powder, and the rest raw materials and the mixing amount are the same as those in the example 1.

Performance detection

The following test criteria or methods were used to test the properties of the different examples 1-22 and comparative examples 1-2, respectively, and the test results are shown in Table 5.

Compressive strength and flexural strength: the compressive strength and flexural strength of cement clinker 7d and 28d were measured by using GB/T17671-2020 method for cement mortar strength test (ISO method), and the saturation ratio of cement clinker was calculated according to the following formula.

Saturation ratio: kh= (CaO-1.65 Al) ₂ O ₃ -0.35Fe ₂ O ₃ )/2.8SiO ₂

TABLE 5 Performance test results of different high-strength cement clinker

The test results in table 5 show that the highest compressive strength and the highest flexural strength of the high-strength cement clinker 3d obtained in the application are respectively 41.7MPa and 7.1MPa, and the highest compressive strength and the highest flexural strength of 28d are respectively 72.1MPa and 10.3MPa, so that the compressive strength and the flexural strength of the cement clinker are improved, the highest saturation reaches 0.98, and the higher the saturation is, the higher the strength of the cement clinker is.

In examples 1-5, the compressive strength and flexural strength of the high-strength cement clinker 3d of example 3 were 28.5MPa and 5.6MPa, respectively, which are higher than those of the cement clinker of examples 1-2 and examples 4-5; and the compressive strength and the flexural strength of the 28d cement clinker are 62.4MPa and 6.5MPa respectively, which are higher than those of the cement clinker of the embodiment 1-2 and the embodiment 4-5, the compressive strength and the flexural strength of the cement clinker are improved, the saturation reaches 0.93, and the compressive strength and the flexural strength of the cement clinker are higher than those of the cement clinker of the embodiment 1-2 and the embodiment 4-5. The modified nano montmorillonite in the high-strength cement clinker raw material of the embodiment 3 is proper in doping amount, so that the strength of the cement clinker is improved, and the modified nano montmorillonite possibly has the advantages of high dispersion uniformity, reduced effect of free calcium oxide in the cement clinker, and reduced calcination temperature of the cement clinker, thereby improving the strength of the cement clinker.

In examples 6 to 8, the compressive strength and flexural strength of the high-strength cement clinker 3d of example 7 were 31.8MPa and 6.0MPa, respectively, which are higher than those of the cement clinker of examples 6 and 8; the compressive strength and the flexural strength of the 28d cement clinker are 65.1MPa and 7.5MPa respectively, which are higher than those of the cement clinker of the embodiment 6 and the embodiment 8, the compressive strength and the flexural strength of the cement clinker are improved, the saturation reaches 0.94, and the compressive strength and the flexural strength of the cement clinker are higher than those of the cement clinker of the embodiment 6 and the embodiment 8. The high-strength cement clinker raw material of the example 7 is shown to have proper mixing amount of the diethanol monoisopropanolamine, so that the strength of the cement clinker is improved, and the strength of the cement clinker is possibly related to the fact that the diethanol monoisopropanolamine and the monoethanol monoisopropanolamine can simultaneously enhance the early strength and the later strength of the cement clinker.

In examples 9 to 12, the compressive strength and flexural strength of the high-strength cement clinker 3d of example 10 were 31.5MPa and 6.8MPa, respectively, which are higher than those of the cement clinker of examples 9 and examples 11 to 12; the compressive strength and the flexural strength of the 28d cement clinker are 67.1MPa and 8.2MPa respectively, which are higher than those of the cement clinker of the embodiment 9 and the cement clinker of the embodiment 11-12, the compressive strength and the flexural strength of the cement clinker are improved, the saturation reaches 0.96, and the compressive strength and the flexural strength of the cement clinker are higher than those of the cement clinker of the embodiment 9 and the cement clinker of the embodiment 11-12. The weight percentage ratio of the fluorine sulfur mineralizer to the carbide slag in the high-strength cement clinker raw material is 1: the method is suitable in 8, improves the strength of the cement clinker, and is possibly related to further adjusting the weight percentage ratio of the fluosulphur mineralizer and the carbide slag, thereby being beneficial to the formation of tricalcium silicate in the cement clinker.

In combination with the performance test data of the cement clinker of the example 10 and the cement clinker of the example 13, the compressive strength and the flexural strength of the high-strength cement clinker 3d of the example 13 are respectively 33.5MPa and 6.9MPa, which are higher than those of the cement clinker of the example 10; and the compressive strength and the flexural strength of the 28d cement clinker are 68.3MPa and 8.9MPa respectively, which are higher than those of the cement clinker of the embodiment 10, so that the compressive strength and the flexural strength of the cement clinker are improved, and the compressive strength and the flexural strength of the cement clinker are improved. The method shows that the strength of the cement clinker can be further improved when the fluorine-sulfur mineralizer and the diethanol monoisopropanolamine are added into the high-strength cement clinker raw material at the same time.

In examples 14 to 18, the compressive strength and flexural strength of the high-strength cement clinker 3d of example 17 were 36.3MPa and 7.0MPa, respectively, which are higher than those of the cement clinker of examples 14 to 16 and example 18; the compressive strength and the flexural strength of the 28d cement clinker are 68.9MPa and 9.7MPa respectively, which are higher than those of the cement clinker of the examples 14-16 and 18, the compressive strength and the flexural strength of the cement clinker are improved, the saturation reaches 0.97, and the compressive strength and the flexural strength of the cement clinker are higher than those of the cement clinker of the examples 14-16 and 18. The mixing amount of barium sulfate and barium oxide in the cement clinker of the embodiment 17 is proper, the strength of the cement clinker is improved, and the mixing of the barium oxide and the barium sulfate can promote the formation of tricalcium silicate mineral in the cement clinker, promote crystal development, improve a crystal structure and further improve the strength of the cement clinker.

The test performance data of example 19 and example 17 are combined to find that the compressive strength of the high-strength cement clinker 3d of example 19 is 37.2MPa, which is higher than that of the cement clinker of example 17; and the compressive strength and the flexural strength of the 28d cement clinker are respectively 70.3MPa and 10.0MPa, which are higher than those of the cement clinker of the embodiment 17, so that the compressive strength and the flexural strength of the cement clinker are improved, and the compressive strength and the flexural strength of the cement clinker are improved. The method shows that the strength of the cement clinker can be further improved by simultaneously adding the diethanol monoisopropanolamine, the barium sulfate and the barium oxide into the raw materials of the cement clinker.

In combination with the test performance data of example 20 and example 19, it was found that the compressive strength and flexural strength of the high-strength cement clinker 3d of example 20 were 38.1MPa and 7.0MPa, respectively, higher than that of the cement clinker of example 19; and the compressive strength and the flexural strength of the 28d cement clinker are 71.2MPa and 10.1MPa respectively, which are higher than those of the cement clinker of the embodiment 19, so that the compressive strength and the flexural strength of the cement clinker are improved, and the compressive strength and the flexural strength of the cement clinker are improved. The method shows that the strength of the cement clinker can be further improved by simultaneously adding diethanol monoisopropanolamine, barium sulfate, barium oxide and a fluosulphur mineralizer into the cement clinker raw material.

In examples 21 to 22, the compressive strength and flexural strength of the high-strength cement clinker 3d of example 22 were at most 41.7MPa and 7.1MPa, respectively; 28d has the highest compressive strength and the highest flexural strength of 72.1MPa and 10.3MPa respectively; the highest saturation reaches 0.98, so that the compressive strength and the flexural strength of the cement clinker are improved, the cement raw material powder is kept at 950 ℃ for 30min before calcination and is kept at 120min after calcination, rapid cooling is adopted after calcination, the cooling speed is 120 ℃/min, the strength of the cement clinker can be further improved, the method can possibly be related to the adoption of high temperature gradient during the calcination of the cement raw material powder, the newly generated calcium oxide has large lattice defects, is easy to react with silica bonds to generate silicate minerals, the calcium oxide is more completely absorbed, the formation of tricalcium silicate is promoted, the strength of the cement clinker is improved, the crystal transformation reaction of tricalcium silicate can be avoided by high-temperature rapid cooling, and the decomposition of tricalcium silicate is prevented.

According to the combination of the performance detection data of the high-strength cement clinker of comparative examples 1-2 and example 1, the strength of the cement clinker is improved to different degrees by adding the modified nano montmorillonite and the high-fine limestone powder into the cement clinker raw materials.

The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.

Claims

1. The high-strength cement clinker is characterized by comprising the following raw materials in percentage by weight: 80-85% of 600-mesh high-fine limestone powder, 2-6% of fly ash, 3-5% of copper slag, 1-5% of modified nano montmorillonite, 2-5% of phosphogypsum, 1-3% of carbide slag, 1-2% of silica, 1-3% of diethanol monoisopropanolamine and 0.2-0.5% of fluosulphur mineralizer, and the diethanol monoisopropanolamine is added and uniformly mixed after being calcined and cooled; the modified nano montmorillonite is obtained by modifying gamma-aminopropyl triethoxysilane;

the specific preparation method of the modified nano montmorillonite comprises the following steps: montmorillonite and gamma-aminopropyl triethoxysilane are mixed according to the volume ratio of 1: (2-3) mixing, stirring uniformly, refluxing and stirring at 70-90 ℃ for 8 hours for reaction, filtering, collecting solid, cleaning by ethanol, drying and grinding to the particle size of 40-60nm to obtain the modified nano montmorillonite.

2. The high-strength cement clinker as claimed in claim 1, wherein: the weight ratio of the fluorine sulfur mineralizer to the carbide slag is 1: (6-12).

3. The high-strength cement clinker as claimed in claim 1, wherein: the high-strength cement clinker raw material also comprises 2-4% of barium sulfate and 2-3% of barium oxide.

4. A process for the production of high-strength cement clinker according to any one of claims 1 to 3, characterized by comprising the following operative steps:

5. The process for producing high-strength cement clinker according to claim 4, wherein: the cement raw meal is incubated at 950 ℃ for 30min before calcination and 120min after calcination.

6. The process for producing high-strength cement clinker according to claim 4, wherein: the cooling adopts rapid cooling, and the cooling speed is 120 ℃/min.