Retired wind power blade cement clinker, and preparation method and application thereof

Abstract

The application provides a retired wind power blade cement clinker, 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 power blades, carbide slag, red mud and iron tailings; the proportioning of the solid waste raw materials is determined according to a preset rate value; the solid waste raw materials are measured according to the proportioning; the carbide slag, the red mud and the iron tailings are uniformly mixed to obtain a mixture; the mixture is ground into raw materials; the raw materials are homogenized and preheated; the preheated raw materials enter a decomposing furnace for decomposition, and coal powder and retired wind power blade powder are sprayed into the decomposing furnace; calcination is performed to obtain the cement clinker. The technical problem solved is how to prepare a cement clinker, so that the retired wind power blades and other solid waste raw materials can be effectively utilized, carbon emission is reduced, the land occupation pollution problem of the retired wind power blades is solved, the additional heat source can be provided in the adding process, the use amount of coal resources is saved, obvious energy saving and environmental protection benefits are achieved, and the production cost of a cement enterprise is reduced.

Description

Technical Field

[0001] This invention relates to the field of ecological cement production and manufacturing technology, and in particular to a cement clinker for decommissioned wind turbine blades, its preparation method, and its application. Background Technology

[0002] Cement is the most widely used and extensively applied building material, found in civil engineering and other fields. Its production primarily uses limestone and clay as raw materials, manufactured through a "two-grinding-one-firing" process. During this process, the high-temperature decomposition of limestone (CaCO3) releases a large amount of carbon dioxide (CO2), making cement the world's third-largest source of CO2 emissions. This poses a significant challenge to the sustainable development of the construction industry.

[0003] In the existing technology, the treatment of retired wind turbine blades is mostly done by incineration or landfill. Only a few reports indicate that retired wind turbine blades can be crushed and added to concrete as an additive for reuse.

[0004] Therefore, finding a way to utilize retired wind turbine blades as cement raw materials while simultaneously addressing the aforementioned issues is of great significance for promoting the sustainable development of the building materials industry. Summary of the Invention

[0005] The main objective of this invention is to provide a cement clinker for decommissioned wind turbine blades, its preparation method, and its application. The technical problem to be solved is how to prepare a cement clinker that can effectively utilize solid waste raw materials such as decommissioned wind turbine blades, carbide slag, red mud, and iron tailings, thereby reducing carbon emissions and solving the problem of land occupation and pollution caused by decommissioned wind turbine blades in the surrounding area, without creating new pollution sources. At the same time, the process of injecting decommissioned wind turbine blade powder into the decomposition furnace can provide an additional heat source, saving coal resources and having significant energy-saving and environmental protection benefits, reducing the production costs of cement enterprises, and thus making it more suitable for practical use.

[0006] The objective of this invention and the technical problem it solves are achieved through the following technical solution. A method for preparing cement clinker from decommissioned wind turbine blades, according to this invention, includes the following steps:

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

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

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

[0010] S14 The mixture is ground into raw powder; homogenized and preheated;

[0011] The raw material after S15 preheating enters the decomposition furnace for decomposition, and coal powder and metered decomposition powder of retired wind turbine blades are injected into the decomposition furnace.

[0012] S16 is calcined to obtain cement clinker.

[0013] The objectives of this invention and the technical problems it addresses can be further achieved by the following technical measures.

[0014] Preferably, in the aforementioned preparation method, for decommissioned wind turbine blades, the solid waste raw material further includes the following steps before crushing:

[0015] The S21 decommissioned wind turbine blades were disassembled, and the blade matrix containing resin and glass fiber was taken out.

[0016] S22 cuts the blade substrate into small pieces and then crushes them.

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

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

[0019] Preferably, in the aforementioned preparation method, the nozzles for injecting pulverized coal into the decomposition furnace and the nozzles for injecting pulverized coal from the decomposition furnace are respectively provided.

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

[0021] Preferably, in the aforementioned preparation method, the specific steps of injecting pulverized coal and metered decomposition turbine blade powder into the decomposition furnace include:

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

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

[0024] The objective of this invention and the technical problem it solves are achieved by the following technical solution. According to this invention, a cement clinker for decommissioned wind turbine blades has the following ratio 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 decommissioned wind turbine blades.

[0025] The objectives of this invention and the technical problems it addresses can be further achieved by the following technical measures.

[0026] Preferably, the aforementioned cement clinker for decommissioned wind turbine blades is prepared according to the aforementioned preparation method.

[0027] The objective of this invention and the technical problem it solves are achieved through the following technical solution: An application of the aforementioned decommissioned wind turbine blade cement clinker in the field of eco-cement, as proposed by this invention.

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

[0029] This invention proposes a method for preparing cement clinker from decommissioned wind turbine blades and its application. The raw materials used in its preparation are all solid waste materials such as decommissioned wind turbine blades, carbide slag, red mud, and iron tailings. Based on a preset target rate value and the composition of the solid waste materials, the method designs the proportions of various solid waste materials. According to this proportion, carbide slag, red mud, and iron tailings are mixed, ground, homogenized, and preheated before being fed into a decomposition furnace for decomposition. By injecting pulverized coal and decommissioned wind turbine blades into the decomposition furnace, on the one hand, the heat generated during the combustion of the decommissioned wind turbine blades can replace part of the heat from the pulverized coal, reducing the coal consumption of the decomposition furnace and saving coal costs; on the other hand, the decommissioned wind turbine blades... The application of this invention effectively solves the land occupation and pollution problem caused by retired wind turbine blades in the surrounding area. It reduces the production costs of cement enterprises without creating new pollution sources or generating new pollution sources, thus reducing carbon emissions from cement production. It demonstrates significant energy-saving and environmental benefits, opening up a new path for comprehensive resource utilization and pointing to a new direction for the green development of the cement industry. Furthermore, the technical solution of this invention uses a four-component feedstock composed entirely of solid waste, ensuring that the actual yield of the prepared cement clinker is controlled within a reasonable range of the target yield. Its various physicochemical properties, such as strength, consistency, fluidity, and setting time, are all within reasonable ranges, meeting the daily production needs of cement enterprises. This invention utilizes industrial solid waste, especially retired wind turbine blades, to produce high-performance cement products. The introduction of retired wind turbine blades not only partially replaces the siliceous and aluminous materials in cement but also provides additional heat, reducing the use of pulverized coal and effectively alleviating the environmental pollution problems caused by retired wind turbine blades. This is of great significance for promoting the sustainable development of the building materials industry and protecting the environment.

[0030] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below. Detailed Implementation

[0031] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the following detailed description, in conjunction with preferred embodiments, details a method for preparing and applying cement clinker for decommissioned wind turbine blades according to the present invention, its specific implementation methods, structures, features, and effects. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable manner.

[0032] This invention proposes a cement clinker for decommissioned wind turbine blades and its preparation method. The cement clinker is made entirely from decommissioned wind turbine blades and solid wastes such as calcium carbide slag, red mud, and iron tailings. Its performance is comparable to that of cement clinker made from non-solid waste raw materials in the prior art. Therefore, solid wastes such as decommissioned 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 decommissioned wind turbine blades, carbide slag, red mud, and iron tailings are crushed. The crushing of carbide slag, red mud, and iron tailings is carried out using conventional methods in the field, and this invention does not specifically limit these methods, as long as they can be easily ground. For decommissioned wind turbine blades, in addition to resin materials containing glass fibers such as the blades themselves, they also include materials such as wood, foam, and metal parts; to effectively utilize them, this invention preferably first separates and sorts them before crushing, removing the filler materials and retaining only the blade matrix containing resin and glass fibers; then, they are cut into small pieces using a cutting machine, and then the small pieces are crushed using a crusher; to facilitate their addition to the decomposition furnace for incineration, this invention preferably crushes them into powder with a particle size of less than 80 μm.

[0034] The second step is to conduct chemical composition analysis on solid waste raw materials such as decommissioned wind turbine blades, calcium carbide slag, red mud, and iron tailings. This step is optional; if the chemical composition of this batch of solid waste raw materials or a certain solid waste raw material is known, this step can be omitted. The technical purpose of analyzing their chemical composition is to enable precise design of cement clinker mix proportions in the subsequent process, so as to better control the clinker yield value and thus control the performance of the finished product.

[0035] Chemical composition analysis of solid waste raw materials such as calcium carbide slag, red mud and iron tailings can be carried out using conventional methods in the field. This invention does not impose specific limitations on these methods, as long as the oxide composition of various solid waste raw materials can be accurately understood.

[0036] The chemical composition analysis steps for decommissioned wind turbine blades are as follows: First, the blades are disassembled and decomposed, and the blade matrix containing resin and glass fiber is retained; then, they are cut into small pieces with a cutting machine, crushed with a pulverizer, and then the crushed decommissioned wind turbine blades are sent into a fluidized bed waste incinerator for combustion to obtain the processed decommissioned wind turbine blade ash; then, the composition of the decommissioned wind turbine blade ash is analyzed using conventional methods in this field.

[0037] The third step is to determine the proportions of the four solid waste raw materials mentioned above based on 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 four solid waste raw materials mentioned above. Based on extensive experimental testing and industry experience, the preferred preset rate values ​​for this invention are as follows: SM 2.4–2.6, KH 0.85±0.1, and IM 1.4–1.5. Rate values ​​within this range ensure that the strength, consistency, fluidity, and setting time of the cement clinker are all within reasonable ranges. In the above technical solutions, the rate values ​​of cement clinker adopt the conventional meaning in the art. Since the materials in the technical solutions of this invention need to be decomposed in a decomposition furnace, and coal powder is added to the decomposition furnace, the coal ash after combustion will have a certain impact on the rate values. The rate values ​​in the embodiments of this invention are all actual measurement results.

[0039] In a specific embodiment of the present invention, the composition of the four solid waste raw materials is shown in Table 1 below, where all units are mass percentages:

[0040] Table 1

[0041] <![CDATA[SiO2]]> <![CDATA[Al2O3]]> MgO CaO <![CDATA[Fe2O3]]> other Loss total Wind turbine blades 50.43 17.91 9.35 5 0.42 2.5 14.39 100 calcium 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] Based on the above chemical composition, the proportions of the four solid waste raw materials are calculated as follows, in terms of mass percentage: decommissioned wind turbine blades 6%–8%, calcium carbide slag 72%–75%, red mud 1%–5%, and iron tailings 16%–18%.

[0043] Cement clinker prepared according to the above four solid waste raw materials in the specified proportions can achieve a 3-day flexural strength of over 2.9 MPa, a 3-day compressive strength of over 17.9 MPa, a 28-day flexural strength of over 6.4 MPa, and a 28-day compressive strength of over 37.7 MPa.

[0044] The proportion 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 proportion is designed according to the chemical composition of the solid waste raw materials shown in Table 1. The design of the proportion of solid waste raw materials in this invention is mainly carried out by controlling its rate value within a preset rate value range.

[0045] The fourth step is the preparation of the mixture. This step can be carried out using conventional methods in the field, and this invention does not impose specific limitations on it, as long as the batching can be accurately completed. In a specific embodiment of this invention, the speed of the belt scale is adjusted by a central control microcomputer. The belt scale transports the crushed calcium carbide slag, crushed red mud, and crushed iron tailings, mixing the three solid waste raw materials in the prescribed amounts evenly to obtain a preliminary mixture.

[0046] The fifth step is to grind the above preliminary mixture into a raw meal. The grinding of the mixture can be carried out using conventional methods in the art, and this invention does not impose specific limitations, as long as the mixture can be ground to a certain particle size. To ensure effective control in subsequent processes, this invention preferably grinds it into a raw meal with a particle size <80μm.

[0047] The sixth step is to homogenize the raw meal. Homogenization of the raw meal can be carried out using conventional methods in the art, and this invention does not specifically limit its application. In one specific embodiment of this invention, the ground raw meal is fed into a raw meal homogenization silo via an elevator to obtain preliminary cement raw meal.

[0048] The seventh step is to preheat the initial cement raw meal. Preheating of the raw meal can be carried out using conventional methods in the art, and this invention does not specifically limit its application. In one specific embodiment of this invention, the initial cement raw meal powder is fed into a multi-stage cyclone preheater via an elevator, where it comes into full contact with the hot airflow from the cooler for suspension preheating.

[0049] The eighth step involves the preheated raw material entering a decomposition furnace for decomposition, into which pulverized coal and a certain mass of decommissioned wind turbine blade powder are injected. The addition process of the decommissioned wind turbine blade powder is one of the innovations of this invention. After chemical composition analysis and preset rate calculations, the proportion of the decommissioned wind turbine blade powder is determined, enabling the production of cement clinker products with superior performance. The decommissioned wind turbine blade powder, measured according to this proportion, is injected into the decomposition furnace through nozzles for incineration. The technical purpose is twofold: firstly, the incineration of the decomposition powder provides a certain amount of calorific value, replacing a certain amount of pulverized coal, thereby reducing the amount of pulverized coal used in the process and saving coal costs; secondly, after incineration, the calcinable matrix of the decomposition powder contains a large amount of silicon and aluminum, which can be used as raw materials for cement clinker to replace some siliceous and aluminous materials, saving raw material costs; simultaneously, the use of solid waste materials greatly reduces carbon dioxide release during the decomposition process, lowering carbon emissions in the cement production process; and it also avoids a series of environmental problems caused by the surge in the number of decommissioned wind turbine blades. This invention utilizes solid waste raw materials, especially the effective use of decommissioned wind turbine blades, which not only saves material costs and energy, but also has good environmental value.

[0050] When injecting pulverized coal and decommissioned wind turbine blade powder into the decomposition furnace, it is preferable to set separate nozzles for injecting pulverized coal and decommissioned wind turbine blade powder into the furnace. The purpose of this arrangement is twofold: firstly, to ensure precise feeding. Because the combustion characteristics, such as calorific value, of pulverized coal and decommissioned wind turbine blade powder differ significantly, the amount of decommissioned wind turbine blade powder injected into the furnace must be controlled to avoid excessive amounts, which could negatively impact the decomposition effect. This invention preferably controls the mass ratio of pulverized coal to decommissioned wind turbine blade powder.

[0051] The ratio of ≥9:1 allows for better synergy between the two materials for material decomposition. Since the amount of decommissioned wind turbine blade powder added is relatively small, injecting it together with pulverized coal may affect the accuracy of its metering. This invention, by setting separate nozzles, allows for better control of their respective injection amounts, angles, and speeds, ensuring they reach an ideal reaction state within the decomposition furnace. For example, pulverized coal primarily serves as fuel, providing heat to maintain the high-temperature environment within the decomposition furnace and decompose substances like calcium carbonate; a suitable injection method is needed to ensure complete combustion. Decommissioned wind turbine blade powder, on the other hand, has a complex composition; separating the nozzles allows for more precise parameter adjustments based on its characteristics to ensure effective decomposition or reaction. Secondly, it prevents mutual interference. If injected through a single nozzle, the two materials may collide and mix unevenly upon entering the decomposition furnace, affecting their dispersion within the furnace. Secondly, the separate nozzles of this invention allow them to enter the decomposition furnace at different locations or in different ways, enabling them to be better dispersed inside the furnace, thereby increasing the contact area with the hot gas flow and other reactants, and promoting a more efficient reaction; thus enabling the decommissioned wind turbine blade powder to be better burned, fully releasing its calorific value and being fully burned into silicon and aluminum materials.

[0052] When injecting pulverized coal and decommissioned wind turbine blade powder into the decomposition furnace, the low calorific value of the decomposition blade powder may negatively impact the decomposition efficiency if injected too early. To better control the decomposition process and ensure complete combustion of the decomposition blade powder, this invention preferably involves first injecting pulverized coal into the furnace, and then, after the coal has stabilized and burned, injecting the decomposition blade powder. To guarantee complete combustion of the decomposition blade powder, its injection time should not be too late; this invention preferably controls the injection of the decomposition blade powder into the furnace within one minute of the pulverized coal injection.

[0053] The ninth step involves feeding the preliminary cement clinker output from the decomposition furnace into a rotary kiln for high-temperature calcination, followed by rapid cooling to obtain cement clinker. This step can be performed using conventional methods in the art, and this invention does not impose specific limitations on it.

[0054] Through the above technical solution, this invention can produce high-performance cement clinker entirely from solid waste raw materials. Especially for the application of decommissioned wind turbine blades, it utilizes elements such as silicon and aluminum to replace some siliceous and aluminous materials, and its combustion contributes to calorific value while saving coal consumption, significantly reducing the production costs of cement companies. Simultaneously, it avoids generating new pollution sources, demonstrating significant energy-saving and environmental benefits. Furthermore, this invention provides a better approach for the comprehensive utilization of resources and the recycling of decommissioned wind turbine blades.

[0055] The present invention also proposes a cement clinker for decommissioned wind turbine blades, with the following ratio values: SM is 2.4 to 2.6, KH is 0.85 ± 0.1, and IM is 1.4 to 1.5; the raw materials for preparing the cement clinker include decommissioned 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 residue of less than 5% on a 45μm square-hole sieve by weight.

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

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

[0059] The present invention will be further described below with reference to specific embodiments, but this should not be construed as a limitation on the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention still fall within the scope of protection of the present invention.

[0060] Unless otherwise specified, all materials and reagents mentioned below are commercially available products well known to those skilled in the art; unless otherwise specified, all methods described are methods known in the art. Unless otherwise defined, the technical or scientific terms used should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0061] Example 1

[0062] This embodiment prepares a cement clinker using only solid waste raw materials. 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) Processing of retired wind turbine blades: First, the retired wind turbine blades are disassembled and decomposed, and the blade matrix containing resin and glass fiber is kept for later use; the blade matrix is ​​first cut into small pieces with a cutting machine, and then crushed into powder with a particle size of 80μm with a pulverizer for later use.

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

[0065] 3) The ingredients are prepared according to the following proportions: 72.45 wt% calcium carbide slag, 4.45 wt% red mud, 16.41 wt% iron tailings, and 6.68 wt% decommissioned wind turbine blades.

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

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

[0068] 6) After grinding, the ground raw meal is sent to the raw meal homogenization silo via the silo elevator to obtain preliminary cement raw meal.

[0069] 7) The raw material powder is fed into the multi-stage cyclone preheater by the elevator, where it comes into full contact with the hot airflow from the cooler and undergoes conventional suspension preheating.

[0070] 8) The preheated raw material enters the decomposition furnace, and pulverized coal and the prescribed amount of decomposition turbine blade powder are injected into the decomposition furnace.

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

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

[0073] Examples 2-6

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

[0075] Table 2

[0076]

[0077]

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

[0079] The technical features in the claims and / or specification of this invention can be combined, and the combination is not limited to the combinations obtained through reference in the claims. Technical solutions obtained by combining the technical features in the claims and / or specification are also within the scope of protection of this invention.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for the production of decommissioned wind turbine blade cement clinker, characterized in that, It comprises the following steps: S11 solid waste raw material crushing; the solid waste raw material comprises decommissioned wind power blades, carbide slag, red mud and iron tailings; S12 determining the proportioning of the solid waste raw material according to a preset rate value; the preset rate value is as follows: SM is 2.4-2.6, KH is 0.85±0.1, and IM is 1.4-1.5; S13 measuring the solid waste raw material according to the proportioning; uniformly mixing the carbide slag, the red mud and the iron tailings to obtain a mixture; in terms of mass percentage, the proportioning is as follows: 6%-8% of the decommissioned wind power blades, 72%-75% of the carbide slag, 1%-5% of the red mud, and 16%-18% of the iron tailings; S14 grinding the mixture into a ground raw material; homogenizing and preheating; S15 preheating the raw material into a decomposing furnace for decomposition, spraying coal powder and measured decommissioned wind power blade powder into the decomposing furnace; S16 calcining to obtain cement clinker.

2. The production method according to claim 1, characterized by, For the decommissioned wind power blades, the following steps are further included before the solid waste raw material crushing: S21 decommissioned wind power blade splitting, taking a blade matrix containing resin and glass fiber therefrom; S22 cutting the blade matrix into small pieces and then crushing.

3. The method of claim 1, wherein, The particle size of the decommissioned wind power blades after crushing is less than 80 μm; the particle size of the ground raw material is less than 80 μm.

4. The method of claim 1, wherein, The nozzle for spraying the coal powder into the decomposing furnace and the nozzle for spraying the decommissioned wind power blade powder into the decomposing furnace are respectively arranged.

5. The preparation method according to claim 1, characterized in that, The mass ratio of the coal powder to the decommissioned wind power blade powder is greater than or equal to 9:

1.

6. The method of claim 1, wherein, The specific steps for spraying the coal powder and the measured decommissioned wind power blade powder into the decomposing furnace include: S81 spraying the coal powder into the decomposing furnace; S82 after the stable combustion of the coal powder, spraying the decommissioned wind power blade powder into the decomposing furnace; the time difference between the spraying time of the coal powder and the spraying time of the decommissioned wind power blade powder is less than or equal to 1 min.

7. A decommissioned wind turbine blade cement clinker, characterized in that, It is prepared by the preparation method of any one of claims 1-6.

8. Use of the decommissioned wind power blade cement clinker according to claim 7 in the field of ecological cement.

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