Cement clinker for retired wind turbine blade as well as preparation method and application of cement clinker

Abstract

The invention provides retired wind turbine blade cement clinker as well as a preparation method and application thereof. The method comprises the following steps: crushing solid waste raw materials; the solid waste raw materials comprise retired wind turbine blades, carbide slag, red mud and iron tailings; determining the proportion of the solid waste raw materials according to a preset rate value; metering the solid waste raw materials according to the proportion; uniformly mixing the carbide slag, the red mud and the iron tailings to obtain a mixture; grinding the mixture into a raw material; homogenizing and preheating the raw material; the preheated raw material enters a decomposing furnace to be decomposed, and pulverized coal and retired wind power blade powder are sprayed into the decomposing furnace; and calcining to obtain the cement clinker. The technical problem to be solved is how to prepare the cement clinker, so that the cement clinker can effectively utilize solid waste raw materials such as the decommissioned wind power blade, reduce carbon emission and solve the problem of land occupation pollution of the decommissioned wind power blade, and the addition process of the cement clinker can provide an additional heat source and save the use amount of coal resources, and has obvious energy-saving and environment-friendly benefits. And the production cost of cement enterprises is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ecological cement production and manufacturing, and in particular to a cement clinker for retired wind turbine blades and a preparation method and application thereof. Background Art

[0002] Cement is the most widely used building material and is widely used in civil engineering and other fields. It is mainly produced from limestone and clay through a "two grinding and one burning" process. In this process, limestone (CaCO 3 ) will release a large amount of carbon dioxide (CO 2 ), making cement the world’s third largest CO 2 Emission sources, which poses a major challenge to the sustainable development of the construction industry.

[0003] In the prior art, retired wind turbine blades are mostly treated by incineration, landfill and other treatment methods. Only a few reports have been published on the use of crushed retired wind turbine blades as additives in concrete.

[0004] Therefore, how to use retired wind turbine blades as cement raw materials and solve the above problems at the same time is of great significance to promoting the sustainable development of the building materials industry. Summary of the invention

[0005] The main purpose of the present invention is to provide a cement clinker of retired wind turbine blades and a preparation method and application thereof. The technical problem to be solved is how to prepare a cement clinker that can effectively utilize solid waste raw materials such as retired wind turbine blades, carbide slag, red mud and iron tailings, reduce carbon emissions, solve the land pollution problem of surrounding retired wind turbine blades, and will not create new pollution sources; at the same time, the process of spraying retired wind turbine blade powder into the decomposition furnace can provide an additional heat source, save the use of coal resources, has obvious energy-saving and environmental protection benefits, reduces the production cost of cement enterprises, and is more suitable for practical use.

[0006] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions. According to a method for preparing cement clinker of retired wind turbine blades proposed in the present invention, the method comprises the following steps:

[0007] S11 solid waste raw material crushing; the solid waste raw materials include retired wind turbine blades, carbide slag, red mud and iron tailings;

[0008] S12 determines the proportion of the solid waste raw materials according to a preset rate value;

[0009] S13 measures the solid waste raw materials according to the ratio; mixes the carbide slag, red mud and iron tailings evenly to obtain a mixture;

[0010] S14: grinding the mixed material into a raw material; homogenizing and preheating;

[0011] S15 The preheated raw material enters the decomposition furnace for decomposition, and coal powder and measured retired wind turbine blade powder are sprayed into the decomposition furnace;

[0012] S16 is calcined to obtain cement clinker.

[0013] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0014] Preferably, in the aforementioned preparation method, for retired wind turbine blades, the solid waste raw materials further include the following steps before being crushed:

[0015] S21 Disassemble retired wind turbine blades and take out the blade matrix containing resin and glass fiber;

[0016] S22: cutting the blade substrate into small pieces and then crushing them.

[0017] Preferably, in the aforementioned preparation method, the particle size of the retired wind turbine blades after crushing is less than 80 μm; and the particle size of the ground raw material is less than 80 μm.

[0018] Preferably, in the aforementioned preparation method, the preset rate values ​​are as follows: SM is 2.4-2.6, KH is 0.85±0.1, and IM is 1.4-1.5; in terms of mass percentage, the proportions are as follows: 6%-8% of retired wind turbine blades, 72%-75% of carbide slag, 1%-5% of red mud, and 16%-18% of iron tailings.

[0019] Preferably, in the aforementioned preparation method, the nozzle for spraying the coal powder into the decomposition furnace and the nozzle for spraying the retired wind turbine blade powder into the decomposition furnace are provided separately.

[0020] Preferably, in the aforementioned preparation method, the mass ratio of the coal powder to the retired wind turbine blade powder is ≥9:1.

[0021] Preferably, in the aforementioned preparation method, the specific step of spraying coal powder and measured retired wind turbine blade powder into the decomposition furnace comprises:

[0022] S81 sprays pulverized coal into the decomposition furnace;

[0023] S82 After the coal powder is stably burned, retired wind turbine blade powder is sprayed into the decomposition furnace; the time difference between the coal powder injection time and the coal powder injection time is ≤1min.

[0024] The purpose of the present invention and the technical problem solved are achieved by adopting the following technical solutions. According to the present invention, a cement clinker for retired wind turbine blades has the following rate values: SM is 2.4-2.6, KH is 0.85±0.1, and IM is 1.4-1.5; the raw materials for preparing the cement clinker include retired wind turbine blades.

[0025] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0026] Preferably, the aforementioned retired wind turbine blade cement clinker is prepared according to the aforementioned preparation method.

[0027] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions: According to the present invention, a cement clinker based on the retired wind turbine blades mentioned above is used in the field of ecological cement.

[0028] By means of the above technical solution, the cement clinker for retired wind turbine blades and its preparation method and application proposed in the present invention have at least the following advantages:

[0029] The retired wind turbine blade cement clinker proposed in the present invention and its preparation method and application all use retired wind turbine blades, carbide slag, red mud, iron tailings and other solid waste raw materials as preparation raw materials; the ratio of various solid waste raw materials is designed according to the composition of the solid waste raw materials through a preset target rate value, and the carbide slag, red mud and iron tailings are mixed into a mixed material according to the ratio, which is then ground, homogenized and preheated and then sent to a decomposition furnace for decomposition; by spraying coal powder and retired wind turbine blades into the decomposition furnace, on the one hand, the heat generated during the incineration process of the retired wind turbine blades can replace part of the heat of the coal powder, thereby reducing the coal consumption of the decomposition furnace and saving the coal cost; on the other hand, the retired wind turbine blades The application of effectively solves the pollution problem of land occupation caused by retired wind turbine blades in the surrounding area, which not only reduces the production cost of cement enterprises, but also does not cause new pollution or create new pollution sources, reduces the carbon emission of cement manufacturing, has obvious energy-saving and environmental protection benefits, opens up a new path for comprehensive resource utilization, and points out a new direction for green development of cement; at the same time, the technical solution of the present invention adopts four-group batching of all solid waste, and the actual rate value of the prepared cement clinker can be controlled within a reasonable range of the target rate value, and its various physical and chemical properties, such as strength, consistency, fluidity, setting time, etc. are all within a reasonable range, which can meet the daily production of cement enterprises. The present invention produces high-performance cement products by rationally utilizing industrial solid waste, especially retired wind turbine blades. The introduction of retired wind turbine blades not only partially replaces the silicon and aluminum materials of cement, but also provides additional heat, reduces the use of coal powder, and effectively alleviates the environmental pollution problems caused by retired wind turbine blades, which is of great significance for promoting the sustainable development of the building materials industry and protecting the environment.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail as follows. DETAILED DESCRIPTION

[0031] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of a cement clinker for retired wind turbine blades and its preparation method and its specific implementation, structure, features and effects proposed by the present invention in combination with the preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0032] The present invention proposes a retired wind turbine blade cement clinker and a preparation method thereof. The cement clinker is made entirely from retired wind turbine blades and solid wastes such as carbide slag, red mud and iron tailings. Its performance is comparable to that of cement clinker prepared from non-solid waste raw materials in the prior art. Therefore, solid wastes such as retired wind turbine blades can replace the raw materials for traditional cement production.

[0033] The method mainly includes the following steps: first, solid waste raw materials such as retired wind turbine blades, carbide slag, red mud and iron tailings are crushed. Among them, the crushing of carbide slag, red mud and iron tailings is carried out according to conventional means in the field, and the present invention does not specifically limit it, as long as it can be smoothly ground. For retired wind turbine blades, since they include materials such as wood, foam, and metal parts in addition to resin materials containing glass fibers such as blades; in order to effectively utilize them, the present invention preferably splits and sorts them before crushing them, removes the filling materials therein, and only retains the blade matrix containing resin and glass fibers; then cuts them into small pieces by a cutting machine, and then crushes the small pieces with a crusher; in order to facilitate its addition to the decomposition furnace for incineration, the present invention preferably crushes them into powders with a particle size of less than <80μm.

[0034] The second step is to analyze the chemical composition of solid waste materials such as retired wind turbine blades, carbide slag, red mud and iron tailings. This step is optional. If the chemical composition of this batch of solid waste materials or a certain solid waste material is known, this step can be omitted. The technical purpose of analyzing its chemical composition is to accurately design the proportion of cement clinker in the future, so as to better control the rate value of cement clinker and thus control the performance of its finished product.

[0035] The chemical composition analysis of solid waste raw materials such as carbide slag, red mud and iron tailings can be carried out by conventional means in the art, and the present invention does not make any specific limitation thereto, as long as the oxide composition of various solid waste raw materials can be accurately understood.

[0036] The steps for chemical composition analysis of retired wind turbine blades are as follows: first, disassemble and decompose them to retain the blade matrix part containing resin and glass fiber; then use a cutter to cut them into small pieces, and then use a crusher to crush them, and then send the crushed retired wind turbine blades into a fluidized bed waste incinerator for combustion to obtain the treated retired wind turbine blade ash; then, use conventional means in the field to test the composition of the retired wind turbine blade ash.

[0037] The third step is to determine the ratio of the above four solid waste raw materials according to the preset rate values.

[0038] The preset rate values ​​are set based on the product performance of the target cement clinker and the composition of the above-mentioned four solid waste raw materials. Based on a large number of experimental tests and industry experience, the preferred preset rate values ​​of the present invention are as follows: SM is 2.4-2.6, KH is 0.85±0.1, and IM is 1.4-1.5; this range of rate values ​​can ensure that the strength, consistency, fluidity, setting time, etc. of the cement clinker are within a reasonable range. In the above-mentioned technical scheme, the rate values ​​of cement clinker all adopt the customary meanings in this field. Since the materials in the technical scheme of the present invention need to be decomposed in a decomposition furnace, and coal powder is added to the decomposition furnace, the coal ash after its combustion will have a certain influence on the rate value. The rate values ​​in the embodiments of the present invention are all actual measurement results.

[0039] In a specific embodiment of the present invention, the compositions of the four solid waste raw materials are shown in Table 1 below, and the units are all in mass percentage:

[0040] Table 1

[0041] <![CDATA[SiO 2 ]]> <![CDATA[Al 2 THE 3 ]]> MgO CaO <![CDATA[Fe 2 THE 3 ]]> other Loss total Wind turbine blades 50.43 17.91 9.35 5 0.42 2.5 14.39 100 Carbide slag 2.64 1.34 0.03 65.03 0 1.02 29.94 100 Red Mud 20.15 11.58 0.74 39.68 12.47 9.04 6.34 100 Iron tailings 62.26 4.78 6.33 7.77 14.37 0.48 4.01 100

[0042] According to the ratio calculation of the four solid waste raw materials with the above chemical composition, the ratio of the above four solid waste raw materials in terms of mass percentage is as follows: retired wind turbine blades 6% to 8%, carbide slag 72% to 75%, red mud 1% to 5%, and iron tailings 16% to 18%.

[0043] The cement clinker prepared according to the ratio of the above four solid waste raw materials has a 3d flexural strength of more than 2.9MPa, a 3d compressive strength of more than 17.9MPa, a 28d flexural strength of more than 6.4MPa, and a 28d compressive strength of more than 37.7MPa.

[0044] The ratio of the above-mentioned solid waste raw materials will change with the change of the chemical composition of the solid waste raw materials. The above-mentioned preferred ratio is designed according to the chemical composition of the solid waste raw materials shown in Table 1; the ratio design of the solid waste raw materials in the present invention is mainly carried out by controlling its rate value within a preset rate value range.

[0045] The fourth step is to prepare the mixture. This step can be carried out by conventional means in the art, and the present invention does not specifically limit it, as long as the batching can be completed accurately. In a specific embodiment of the present invention, the speed of the conveyor belt scale is adjusted by the central control microcomputer, and the carbide slag crushed material, red mud crushed material and iron tailings crushed material are transported by the conveyor belt scale, and the three solid waste raw materials in the formula amount are evenly mixed to obtain a preliminary mixture.

[0046] The fifth step is to grind the above-mentioned preliminary mixture into a grinding raw material. The grinding of the mixture can be carried out by conventional means in the art, and the present invention does not specifically limit it, as long as the mixture can be ground to a certain particle size. In order to be effectively controlled in the subsequent process, the present invention preferably grinds it into a grinding raw material with a particle size of less than 80 μm.

[0047] The sixth step is to homogenize the raw material. The raw material homogenization can be carried out by conventional means in the art, and the present invention does not specifically limit it. In a specific embodiment of the present invention, the ground raw material is sent to the raw material homogenization bin by a storage elevator for homogenization to obtain preliminary cement raw material.

[0048] The seventh step is to preheat the preliminary cement raw meal. The preheating of the raw meal can be carried out by conventional means in the art, and the present invention does not specifically limit it. In a specific embodiment of the present invention, the preliminary cement raw meal powder is sent to a multi-stage cyclone preheater through an elevator, where it is fully contacted with the hot air flow from the cooler and is suspended and preheated.

[0049] The eighth step is to put the preheated raw material into the decomposition furnace for decomposition, and spray coal powder and a certain amount of retired wind turbine blade powder into the decomposition furnace. In this step, the addition process of retired wind turbine blade powder is one of the innovative points of the present invention. After the retired wind turbine blade powder is analyzed for chemical composition and calculated according to the preset rate value, its proportion is obtained, so that it can prepare cement clinker products with better performance. The retired wind turbine blade powder measured according to the proportion is sprayed into the decomposition furnace through a nozzle to be burned; its technical purpose is, on the one hand, that the retired wind turbine blade powder is burned in the decomposition furnace, which will provide a certain calorific value to replace a certain amount of coal powder, thereby reducing the use of coal powder in the process and saving the cost of coal; on the other hand, after the retired wind turbine blade powder is burned in the decomposition furnace, its burning base contains a large amount of silicon and aluminum and other elements, which can be used as a raw material for cement clinker to replace part of the silicon material and aluminum material, saving the cost of raw materials; at the same time, due to the use of solid waste raw materials, the release of carbon dioxide in the decomposition process is greatly reduced, reducing the carbon emissions in the cement process; it can also avoid a series of environmental problems caused by the surge in the number of retired wind turbine blades. The present invention utilizes solid waste raw materials, especially the effective utilization of retired wind turbine blades, thereby saving material costs and energy, and also has good environmental value.

[0050] When spraying coal powder and retired wind turbine blade powder into the decomposition furnace, it is preferred that the nozzles for spraying coal powder into the decomposition furnace and the nozzles for spraying retired wind turbine blade powder into the decomposition furnace are set separately; the technical purpose of such setting is: first, to ensure the accuracy of feeding. Since the combustion characteristics of coal powder and retired wind turbine blade powder, such as calorific value, are quite different, when spraying coal powder and retired wind turbine blade powder into the decomposition furnace, it is necessary to control the amount of retired wind turbine blade powder not to be too large, so as not to have a significant impact on the decomposition effect of the decomposition furnace; the present invention preferably controls the mass ratio of coal powder and retired wind turbine blade powder

[0051] ≥9:1, so that the two can work together better to decompose the material; due to the small amount of retired wind turbine blade powder added, spraying it together with coal powder may affect the accuracy of its metering; and the present invention sets nozzles separately to better control their respective injection amounts, injection angles and injection speeds, so that they can reach an ideal reaction state in the decomposition furnace. For example, coal powder is mainly used as a fuel to provide heat to maintain the high temperature environment in the decomposition furnace, so that substances such as calcium carbonate can be decomposed, and a reasonable injection method is required to ensure its full combustion; while retired wind turbine blade powder has a complex composition. To effectively decompose it or participate in the reaction, setting nozzles separately is more conducive to adjusting parameters according to its characteristics. The second is to prevent the two from interfering with each other. If sprayed through one nozzle, the two materials may collide with each other and mix unevenly at the moment of entering the decomposition furnace, affecting their respective dispersion effects in the furnace. Second, the separate nozzles of the present invention allow them to enter the decomposition furnace at different positions or in different ways, and can be better dispersed in the furnace, thereby increasing the contact area with the hot air flow and other reaction substances, and promoting a more efficient reaction; thereby, the retired wind turbine blade powder can be better incinerated, so that it can fully release its calorific value and be fully incinerated into silicon material and aluminum material.

[0052] When spraying coal powder and retired wind turbine blade powder into the decomposition furnace, since the calorific value of retired wind turbine blade powder is low, spraying it into the decomposition furnace too early may have an adverse effect on the decomposition effect of the decomposition furnace; in order to better control the decomposition process and make the retired wind turbine blade powder be burned more fully, the specific steps of spraying coal powder and retired wind turbine blade powder into the decomposition furnace in the present invention are to first spray coal powder into the decomposition furnace, and then spray retired wind turbine blade powder into the decomposition furnace after the coal powder is stably burned. In order to ensure the full burning of retired wind turbine blade powder, the injection time should not be too late. The present invention preferably controls the retired wind turbine blade powder to be sprayed into the decomposition furnace within one minute after the coal powder is injected.

[0053] The ninth step is to send the preliminary cement clinker output from the decomposition furnace into a rotary kiln for high temperature calcination, and then rapidly cool it to obtain cement clinker. This step can be carried out by conventional means in the art, and the present invention does not specifically limit it.

[0054] Through the above technical solution, the present invention can use all solid waste raw materials to prepare cement clinker with better performance, especially for the application of retired wind turbine blades, which not only uses silicon, aluminum and other elements to replace part of the silicon and aluminum materials, but also can use their incineration to contribute part of the calorific value to save part of the coal, greatly reducing the production cost of cement enterprises, while avoiding the generation of new pollution sources, showing significant energy-saving and environmental protection benefits. At the same time, the technical solution of the present invention also finds a better way for the comprehensive utilization of resources and the recycling of retired wind turbine blades.

[0055] The present invention also proposes a retired wind turbine blade cement clinker, whose rate values ​​are as follows: SM is 2.4-2.6, KH is 0.85±0.1, and IM is 1.4-1.5; the raw materials for preparing the cement clinker include retired wind turbine blades.

[0056] The cement clinker of the present invention is preferably prepared by the aforementioned preparation method. The cement clinker prepared by the technical solution of the present invention has a sieve residue of less than 5% on a 45 μm square hole sieve by mass.

[0057] In a specific embodiment of the present invention, the rates of the cement clinker are as follows: SM is 2.4-2.6, KH is 0.85±0.1, and IM is 1.4-1.5; in terms of mass percentage, the raw materials for preparing the cement clinker include: 6%-8% retired wind turbine blades, 72%-75% carbide slag, 1%-5% red mud, and 16%-18% iron tailings.

[0058] The present invention also proposes an application of the aforementioned cement clinker in the field of ecological cement.

[0059] The present invention will be further described below in conjunction with specific embodiments, but this should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by technicians in this field based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0060] Unless otherwise specified, the materials, reagents, etc. involved below are all commercially available products well known to those skilled in the art; unless otherwise specified, the methods described are all methods well known in the art. Unless otherwise defined, the technical terms or scientific terms used should have the common meanings understood by ordinary technicians in the field to which the present invention belongs.

[0061] Example 1

[0062] This embodiment prepares a cement clinker using all solid waste raw materials, wherein the chemical compositions of the four solid waste raw materials used in this embodiment are shown in Table 1. The specific steps are as follows:

[0063] 1) Treatment of retired wind turbine blades: First, disassemble and decompose the retired wind turbine blades, and keep the blade matrix containing resin and glass fiber; first use a cutting machine to cut the blade matrix into small pieces, and then use a crusher to crush it into powder with a particle size of 80μm for later use.

[0064] 2) The carbide slag, red mud and iron tailings in the solid waste raw materials are crushed separately for later use.

[0065] 3) The ingredients are prepared according to the ratio of 72.45wt% of carbide slag, 4.45wt% of red mud, 16.41wt% of iron tailings and 6.68wt% of retired wind turbine blades.

[0066] 4) The speed of the conveyor belt scale is adjusted by the central control microcomputer, and the carbide slag, red mud and iron tailings are transported by the conveyor belt scale to mix the three solid waste raw materials in the formula amount evenly to obtain a preliminary mixture.

[0067] 5) The preliminary mixture is fed into the raw material mill for grinding. The particle size of the raw material after grinding should be less than 80μm.

[0068] 6) After grinding, the ground raw material is sent to the raw material homogenization warehouse through the warehouse elevator for homogenization to obtain preliminary cement raw material.

[0069] 7) The raw meal powder is sent into the multi-stage cyclone preheater through the elevator, fully contacted with the hot air flow from the cooler, and subjected to conventional suspension preheating.

[0070] 8) The preheated raw meal enters the decomposition furnace, into which coal powder and a formulated amount of retired wind turbine blade powder are sprayed.

[0071] 9) The decomposed cement clinker enters the rotary kiln and is calcined at a high temperature of 1450°C.

[0072] The cement clinker prepared in this example was ground and then subjected to quality inspection. The results are shown in Table 2.

[0073] Embodiments 2 to 6

[0074] The same as Example 1, except that the ratio of the solid waste raw materials is different, as shown in Table 2. The test results are shown in Table 2.

[0075] Table 2

[0076]

[0077]

[0078] It can be seen from the solid waste material ratio and performance test results shown in Table 2 that in each embodiment, its various physical and chemical properties, such as strength, consistency, fluidity, setting time, etc. are all within a reasonable range and can meet the daily production of cement enterprises.

[0079] The technical features in the claims and / or the specification of the present invention may be combined, and the combination is not limited to the combination obtained by reference in the claims. The technical solution obtained by combining the technical features in the claims and / or the specification is also within the protection scope of the present invention.

[0080] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A method for preparing cement clinker from retired wind turbine blades, characterized in that: It includes the following steps: S11 solid waste raw material crushing; the solid waste raw materials include retired wind turbine blades, carbide slag, red mud and iron tailings; S12 determines the proportion of the solid waste raw materials according to a preset rate value; S13 measures the solid waste raw materials according to the ratio; mixes the carbide slag, red mud and iron tailings evenly to obtain a mixture; S14: grinding the mixed material into a raw material; homogenizing and preheating; S15 The preheated raw material enters the decomposition furnace for decomposition, and coal powder and measured retired wind turbine blade powder are sprayed into the decomposition furnace; S16 is calcined to obtain cement clinker.

2. The preparation method according to claim 1, characterized in that: For retired wind turbine blades, the solid waste raw materials may be crushed before the crushing, and the following steps may be included: S21 Disassemble retired wind turbine blades and take out the blade matrix containing resin and glass fiber; S22: cutting the blade substrate into small pieces and then crushing them.

3. The preparation method according to claim 1, characterized in that: The particle size of the pulverized retired wind turbine blades is less than 80 μm; and the particle size of the ground raw material is less than 80 μm.

4. The preparation method according to claim 1, characterized in that: The preset rate values ​​are as follows: SM is 2.4-2.6, KH is 0.85±0.1, and IM is 1.4-1.5; in terms of mass percentage, the proportions are as follows: 6%-8% of retired wind turbine blades, 72%-75% of carbide slag, 1%-5% of red mud, and 16%-18% of iron tailings.

5. The preparation method according to claim 1, characterized in that: The nozzle for spraying the coal powder into the decomposition furnace and the nozzle for spraying the retired wind turbine blade powder into the decomposition furnace are set separately.

6. The preparation method according to claim 1, characterized in that: The mass ratio of the coal powder to the retired wind turbine blade powder is ≥9:

1.

7. The preparation method according to claim 1, characterized in that: The specific steps of injecting coal powder and measured retired wind turbine blade powder into the decomposition furnace include: S81 sprays pulverized coal into the decomposition furnace; S82 After the coal powder is stably burned, retired wind turbine blade powder is sprayed into the decomposition furnace; the time difference between the coal powder injection time and the coal powder injection time is ≤1min.

8. A cement clinker for retired wind turbine blades, characterized in that: The rate values ​​are as follows: SM is 2.4-2.6, KH is 0.85±0.1, and IM is 1.4-1.5; the raw materials for preparing the cement clinker include retired wind turbine blades.

9. The cement clinker of retired wind turbine blades according to claim 8, characterized in that: The invention is prepared by the preparation method according to any one of claims 1 to 7.

10. Application of the cement clinker of retired wind turbine blades according to claim 8 or 9 in the field of ecological cement.

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