A composite board based on cast iron slag and textile waste and a method for preparing the same

Abstract

This invention discloses a composite board based on cast iron slag and textile waste, and its preparation method, belonging to the technical field of composite board technology. The composite board based on cast iron slag and textile materials of this invention comprises the following raw materials in parts by weight: 55-95 parts textile material, 5-45 parts modified cast iron slag, 0.5-3 parts polyethylene wax, and 2-6 parts anti-aging additives. This invention proposes a composite board based on cast iron slag and textile waste, its preparation method, and its application. The composite board uses inorganic filler cast iron slag as reinforcement, recycled textile waste as the matrix, and adhesive material. A coupling agent is added to enhance the compatibility between the cast iron slag and textile waste, improving the mechanical properties of the composite board. Simultaneously, the recycled textile waste undergoes crushing and mixing treatment, followed by multiple continuous mixing processes during the open milling process, effectively solving the problem of poor uniformity of the textile waste. This method is suitable for the preparation of large-format composite boards and has significant application value.

Description

Technical Field

[0001] This invention relates to the field of composite board technology, and in particular to a composite board based on cast iron slag and textile waste and its preparation method. Background Technology

[0002] Cast iron slag is a waste product generated by the ferrous metal industry, typically composed of oxides and sulfides, and often appears on the surface of molten iron. Cast iron slag can be generated from various sources, such as scrap, oxidation of molten metal, chemical reactions with other elements like sulfur and phosphorus, and substances added to adjust composition and remove slag. Currently, technologies for the secondary utilization of cast iron slag are not yet mature, and its disposal as industrial waste through stockpiling and landfilling remains the primary method.

[0003] The textile industry generates significant pollution during production, leading to the depletion of non-renewable resources and ecosystem imbalances. Furthermore, textile waste generated at different stages of production is often centrally stockpiled, and the complexity and cost of separating waste from different textile materials remain unresolved. Studies show that over 66% of textile waste is directly landfilled or incinerated, with only 15% being recycled. This waste is directly exposed to the natural environment during landfilling or incineration, resulting in the generation of pollutants and greenhouse gases. Therefore, reusing remaining materials can reduce waste and environmental impact, and alleviate pressure on textile production.

[0004] Therefore, the rational utilization of two major waste materials, cast iron slag and textile waste, to address the resource shortage crisis while achieving resource recycling and reducing environmental pollution has significant economic and social value. CN116423951A discloses a method for preparing and applying a composite board based on waste fabric and thermoplastic resin, which uses textile fabric as reinforcement and recycled thermoplastic resin as matrix. However, it does not involve specific types of textile products and has poor impact performance and high cost. CN116496584A relates to a method for preparing a thermoplastic composite board for building decoration, which uses recycled plastic as filler and thermoplastic plastic as matrix. However, its preparation process requires a relatively complex crosslinking agent and has high cost. CN108641195A discloses a polypropylene-based thermoplastic composite material for rail transit, which uses thermoplastic polypropylene as matrix and fiber or inorganic filler as reinforcement. However, its raw materials involve the use of hollow glass microspheres and reinforcing fibers such as glass fiber and carbon fiber, or inorganic fillers such as titanium dioxide and talc, resulting in relatively high prices.

[0005] It is evident that the key to solving the pollution problem caused by cast iron slag and textile waste lies in how to fully utilize cast iron slag and textile waste while reducing production costs and improving product performance. Summary of the Invention

[0006] The purpose of this invention is to provide a composite plate based on cast iron slag and textile waste, and its preparation method. This invention proposes a composite plate based on cast iron slag and textile waste, its preparation method, and its application. The composite plate uses inorganic filler cast iron slag as the reinforcing body, recycled textile waste as the matrix, and adhesive material. A coupling agent is added to enhance the compatibility between the cast iron slag and textile waste, thereby improving the mechanical properties of the composite plate. Simultaneously, the recycled textile waste undergoes crushing and mixing treatment, followed by multiple continuous mixing processes during the open milling process, effectively solving the problem of poor uniformity of the textile waste. This method is suitable for the preparation of large-format composite plates and has significant application value.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] One of the technical solutions of this invention is to provide a composite plate based on cast iron slag and textile materials, comprising the following raw materials in parts by weight:

[0009] 55-95 parts textile materials, 5-45 parts modified cast iron slag, 0.5-3 parts polyethylene wax, and 2-6 parts anti-aging auxiliaries.

[0010] Preferably, the anti-aging additive is an anti-ultraviolet agent and / or an antioxidant.

[0011] Preferably, the textile material includes one or more of ethylene, polypropylene, polyester, nylon 66 fiber, and polyester fiber; the textile material is textile waste.

[0012] Preferably, the method for preparing the modified cast iron slag includes the following steps:

[0013] The cast iron slag and coupling agent are mixed in ethanol and reacted to obtain modified cast iron slag.

[0014] More preferably, the coupling agent includes one or more of titanate coupling agents, aluminate coupling agents, rare earth coupling agents, and maleic anhydride compounds.

[0015] More preferably, the mass ratio of the cast iron slag, coupling agent, and ethanol is 5-45:0.5-2.5:250-1250; the particle size of the cast iron slag is 0.05 mm; the reaction includes the following steps: ultrasonic dispersion for 30-50 min, vacuum filtration, vacuum drying at 50-60℃ for 30-50 min, drying at 90-120℃ for 60-70 min, so that the coupling agent undergoes a condensation chemical reaction with the hydroxyl groups (-OH) on the surface of the cast iron slag, followed by washing, filtration, and drying.

[0016] During the preparation of modified cast iron slag, the coupling agent undergoes a condensation chemical reaction with the hydroxyl groups on the surface of the cast iron slag. A large number of coupling agent molecules are grafted onto the surface of the cast iron slag, forming an organic film structure. This reduces the affinity for water, thus giving the cast iron slag strong hydrophobicity, significantly reducing agglomeration and specific surface energy, enhancing dispersibility, improving its compatibility with textile materials, and increasing the interfacial strength between the two.

[0017] The amount of modified cast iron slag added should not be too low, otherwise it will weaken the constraint on the slippage and extension of the matrix molecular chain segments, resulting in a decrease in mechanical properties.

[0018] The second technical solution of the present invention provides a method for preparing the above-mentioned composite plate based on cast iron slag and textile materials, comprising the following steps:

[0019] The textile material is crushed and mixed with the modified cast iron slag, polyethylene wax, and anti-aging additives, melted, pressed into shape, and left to stand to obtain the composite board based on cast iron slag and textile material.

[0020] Preferably, the pulverization is performed to a particle size of 0.05 mm.

[0021] Preferably, the melting temperature is 160-200℃ and the time is 5-10 min; the pressure for pressing is 10-15 MPa and the time is 5-7 min; the settling time is 18-26 h.

[0022] The beneficial technical effects of the present invention are as follows:

[0023] This invention uses waste materials (cast iron slag and textile waste) as the main raw materials. Through the rational utilization of these materials and the addition of specific coupling agents, it significantly reduces the agglomeration and specific surface energy of cast iron slag, improves the compatibility between cast iron slag and textile waste matrix, and enhances the interfacial strength between the two. This results in the preparation of a composite board with excellent comprehensive performance, realizing the recycling of bulk solid waste. While addressing the resource shortage crisis, it also achieves resource recycling and minimizes environmental pollution, thus possessing significant economic and social value.

[0024] This invention effectively solves the problem of uneven composition of textile waste by crushing and smelting raw materials, improves the uniformity and mechanical properties of composite boards, and can be applied to the preparation of large panels, realizing the efficient and comprehensive utilization of cast iron slag and waste fabrics.

[0025] The composite board prepared by this invention has excellent mechanical properties, with a tensile strength of 27-34 MPa, a flexural strength of 35-43 MPa, and an impact strength of 20-30 KJ / m. 2Compared with new thermoplastic resin-based composite products, it exhibits superior cost advantages and comparable performance, can meet demanding engineering requirements, and has a promising future.

[0026] This invention proposes a composite plate based on cast iron slag and textile waste, its preparation method, and its application. The composite plate uses inorganic filler cast iron slag as the reinforcing body, recycled textile waste as the matrix, and adhesive material. By adding a coupling agent, the compatibility between cast iron slag and textile waste is enhanced, thereby improving the mechanical properties of the composite plate. At the same time, the recycled textile waste is crushed and mixed, and then repeatedly and continuously mixed during the open milling process, which effectively solves the problem of poor uniformity of textile waste. This method can be adapted to the preparation of large-format composite plates and has great application value. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 The images show SEM images of the tensile fractures of the products obtained in Comparative Example 1 and Example 3. (a) is Comparative Example 1, and (b) is Example 3.

[0029] Figure 2 The image shows the XPSC1s orbital peaks of the product obtained in Example 2. Detailed Implementation

[0030] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention. It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the present invention.

[0031] Furthermore, regarding the numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, are also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0032] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar to or equivalent to those described herein may be used in the implementation or testing of this invention.

[0033] The terms “comprising,” “including,” “having,” “containing,” etc., used in this invention are all open-ended terms, meaning that they include but are not limited to.

[0034] This invention provides a composite board based on cast iron slag and textile materials, comprising the following raw materials in parts by weight: 55-95 parts textile materials, 5-45 parts modified cast iron slag, 0.5-3 parts polyethylene wax, and 2-6 parts anti-aging additives.

[0035] Furthermore, by adding a specific amount of polyethylene wax during the preparation process, it is helpful to enhance the plasticization degree of the composite board, improve its toughness and surface smoothness. At the same time, polyethylene wax can evenly disperse the particulate inorganic filler in the composite board, thereby improving the mechanical properties of the composite board.

[0036] The modified cast iron slag is obtained by mixing cast iron slag and a coupling agent in ethanol and reacting them; the anti-aging additive is an anti-ultraviolet agent and / or an antioxidant.

[0037] The method for preparing the composite plate based on cast iron slag and textile materials includes: crushing the textile material, mixing it with the modified cast iron slag, polyethylene wax, and anti-aging additives, melting it, pressing it into shape, and letting it stand to obtain the composite plate based on cast iron slag and textile materials.

[0038] More preferably, the coupling agent includes one or more of the following: titanate coupling agent NDZ-311, aluminate coupling agent DL-411, rare earth coupling agent WOT-108, and maleic anhydride compounds.

[0039] More preferably, the maleic anhydride compound is selected from maleic anhydride or maleic anhydride graft polymer.

[0040] Maleic anhydride decomposes during pressure molding, producing irritating gases; maleic anhydride-grafted polymers can prevent the generation of irritating odors, but the cost is higher; the two have basically the same functionality and can be selected according to the actual situation.

[0041] More preferably, the UV stabilizer includes hindered amine UV stabilizers and / or benzotriazole UV stabilizers, more preferably one or more of UV stabilizers UV-P, UV stabilizer UV-326, UV stabilizer UV-327, UV stabilizer UV-351, and UV stabilizer UV-531; the antioxidant includes phosphite antioxidants and / or hindered phenolic antioxidants, more preferably one or more of antioxidants 168, antioxidant 3114, antioxidant 1010, and antioxidant 1222.

[0042] More preferably, the process includes selecting the textile material before crushing it.

[0043] More preferably, the raw materials are mixed by performing 2-5 uninterrupted open mill blending processes at 160-200℃.

[0044] The raw material mixing method specified in this invention can further solve the problem of uneven composition of textile waste.

[0045] More preferably, the pressure molding process further includes a venting step, wherein the venting is performed 3-5 times.

[0046] The cast iron slag used in the following embodiments and comparative examples of the present invention has a particle size of 0.05 mm and the cast iron slag used comes from Weifang City, Shandong Province.

[0047] The textile materials used in the following embodiments and comparative examples of the present invention have a particle size of 0.2 mm after crushing.

[0048] All raw materials used in the following embodiments and comparative examples of the present invention are commercially available products.

[0049] Example 1

[0050] Preparation of modified cast iron slag powder:

[0051] 0.1g of aluminate coupling agent DL411 was prepared into a solution with 80mL of anhydrous ethanol. 8g of cast iron slag was impregnated in the solution and reacted in an ultrasonic cleaner with ultrasonic stirring for 30min. After being filtered by a vacuum pump, it was vacuum dried at 50℃ for 30min and then dried at 90℃ for 60min. After washing with anhydrous ethanol and high-purity water in sequence, filtered, and dried at 90℃ for 70min, modified cast iron slag powder A was obtained.

[0052] Example 2

[0053] Preparation of modified cast iron slag powder:

[0054] 0.3 mL of titanate coupling agent NDZ-311 was prepared with 200 mL of anhydrous ethanol. 10 g of cast iron slag was impregnated in the solution and reacted in an ultrasonic cleaner with ultrasonic stirring for 50 min. After being filtered by a vacuum pump, it was vacuum dried at 60 °C for 40 min and then dried at 100 °C for 65 min. After washing with anhydrous ethanol and high-purity water in sequence, filtered, and dried at 100 °C for 60 min, modified cast iron slag powder B was obtained.

[0055] Example 3

[0056] The composite board is composed of the following parts by weight of raw materials:

[0057] 65 parts of textile materials (discarded masks), 35 parts of modified cast iron slag powder B, 4 parts of polyethylene wax, and 5 parts of anti-aging additive (the ratio of UV-P and antioxidant 168 is 1:1.57).

[0058] Preparation of composite panels:

[0059] The recycled waste masks (mainly composed of polypropylene) are sterilized at high temperature, crushed in a crusher, rinsed with water to remove impurities, and dried to obtain recycled mask fragments; all raw materials are continuously blended at 180℃ for 4 times, then kept at 180℃ for 5 minutes to fully melt, and then transferred into a mold. They are then molded under a pressure of 10MPa for 5 minutes, during which air is released 3 times, and then left to stand for 18 hours to obtain a composite board.

[0060] Example 4

[0061] The composite board is composed of the following parts by weight of raw materials:

[0062] 65 parts of textile materials (recycled seat fabric), 30 parts of modified cast iron slag powder A, 6 parts of polyethylene wax, and 4 parts of anti-aging additives (the ratio of UV stabilizer UV-326 to antioxidant 3114 is 1:1.82).

[0063] Preparation of composite panels:

[0064] The recycled seat fabric (mainly polypropylene) was crushed in a crusher, rinsed with water to remove impurities, and dried to obtain recycled seat fabric fragments. All raw materials were continuously blended at 180°C three times, then kept at 180°C for 8 minutes to fully melt and transferred into a mold. The mold was cooled and shaped under a pressure of 10 MPa for 6 minutes, during which the gas was released 5 times. The mold was then left to stand for 24 hours to obtain a composite board.

[0065] Example 5

[0066] The composite board is composed of the following parts by weight of raw materials:

[0067] 62 parts of textile material (waste polyethylene rope), 38 parts of modified cast iron slag powder A, 4 parts of polyethylene wax, and 4 parts of anti-aging additive (the ratio of UV stabilizer UV-327 and antioxidant 1010 is 1:1.60).

[0068] Preparation of composite panels:

[0069] Waste ethylene ropes are crushed in a shredder, rinsed with water to remove impurities, and dried to obtain recycled seat fabric fragments; all raw materials are continuously blended at 160℃ three times, then kept at 160℃ for 5 minutes to fully melt, and then transferred into a mold, cooled and shaped under a pressure of 10MPa for 5 minutes, during which gas is released three times, and then left to stand for 18 hours to obtain a composite board.

[0070] Example 6

[0071] The composite board is composed of the following parts by weight of raw materials:

[0072] 58 parts of textile material (waste polyethylene fiber), 2 parts of modified cast iron slag powder B4, 3 parts of polyethylene wax, and 4 parts of anti-aging agent (the ratio of UV stabilizer UV-351 and antioxidant 1222 is 1:1.23).

[0073] Preparation of composite panels:

[0074] Impurities in the recycled waste ethylene fiber (mainly ethylene fiber) are removed to avoid affecting the strength and uniformity of the composite board. The remaining part is crushed in a crusher, rinsed with water to remove impurities, and dried to obtain recycled seat fabric fragments. All raw materials are continuously blended at 160℃ for 4 times, then kept at 160℃ for 8 minutes to fully melt them. The mixture is then transferred to a mold and cooled and shaped under a pressure of 10MPa for 6 minutes, during which gas is released 5 times. The mixture is then left to stand for 24 hours to obtain the composite board.

[0075] Example 7

[0076] The composite board is composed of the following parts by weight of raw materials:

[0077] 56 parts of textile material (recycled polyester staple fiber needle-punched geotextile), 44 parts of modified cast iron slag powder A, 5 parts of polyethylene wax, and 3 parts of anti-aging additive (the ratio of UV-P anti-ultraviolet agent and antioxidant 3114 is 1:1.25).

[0078] Preparation of composite panels:

[0079] Impurities were removed from the recycled polyester staple fiber needle-punched geotextile (mainly composed of ethylene and polyester). The remaining part was crushed in a crusher, rinsed with water to remove impurities, and dried to obtain recycled seat fabric fragments. All raw materials were continuously blended at 170℃ for 5 times, then kept at 170℃ for 5 minutes to fully melt them. The mixture was then transferred into a mold and cooled and shaped under a pressure of 10MPa for 5 minutes, during which time the gas was released 5 times. The mixture was then allowed to stand for 24 hours to obtain a composite board.

[0080] Comparative Example 1

[0081] The only difference from Example 3 is that the modified cast iron slag powder B is replaced with an equal mass of unmodified cast iron slag.

[0082] Comparative Example 2

[0083] The only difference from Example 4 is that the modified cast iron slag powder A is replaced with an equal mass of unmodified cast iron slag.

[0084] Comparative Example 3

[0085] The only difference from Example 6 is that 30 parts by mass of modified cast iron slag powder B is replaced with 30 parts by mass of waste ethylene fiber (i.e., the mass ratio of waste ethylene fiber to modified cast iron slag powder B is adjusted to 88:12).

[0086] Comparative Example 4

[0087] The only difference from Example 7 is that 26 parts by mass of modified cast iron slag powder A are replaced with 26 parts by mass of recycled polyester staple fiber needle-punched geotextile (i.e., the mass ratio of recycled polyester staple fiber needle-punched geotextile to modified cast iron slag powder A is adjusted to 82:18).

[0088] Comparative Example 5

[0089] The only difference from Example 7 is that the modified cast iron slag powder A is replaced with an equal mass of red mud (the median particle size of the red mud is 0.08 mm, and it comes from Henan Zhongzhou Aluminum Plant Co., Ltd.).

[0090] Effect verification

[0091] (1) Mechanical properties were tested on Examples 3-7 and Comparative Examples 1-5. The test results are shown in Table 1.

[0092] Table 1 Mechanical Properties

[0093] Tensile strength / MPa Bending strength / MPa <![CDATA[Impact strength / KJ / m 2 > Test Standards GB / T1040.1-2018 GB / T9341-2008 GB / T1843-2008 Example 3 31.8 39.4 21.7 Example 4 30.3 37.6 21.2 Example 5 29.8 35.5 23.6 Example 6 30.8 37.3 25.7 Example 7 33.9 42.4 29.2 Comparative Example 1 27.5 28.3 19.8 Comparative Example 2 26.1 33.3 18.5 Comparative Example 3 28.2 34.9 20.6 Comparative Example 4 30.5 37.2 24.7 Comparative Example 5 28.3 33.7 20.5

[0094] As shown in Table 1, the composite board samples prepared in Examples 3-7 of this invention have tensile strengths of 29-34 MPa, flexural strengths of 35-43 MPa, and impact strengths of 21-30 KJ / m. 2It possesses excellent comprehensive mechanical properties. Furthermore, through the crushing and open-milling mixing of raw materials, the uniformity and mechanical properties of the composite plate are improved, realizing the efficient and comprehensive utilization of cast iron slag and waste fabrics. It demonstrates outstanding cost advantages and superior performance, can meet demanding engineering requirements, and has a promising development prospect.

[0095] Comparative Examples 1 and 2 showed unsatisfactory mechanical properties due to the lack of modification of the cast iron slag. This is mainly because unmodified cast iron slag easily leads to particle agglomeration and stress defects on the stress-bearing surface of the composite material, causing cracking and energy absorption.

[0096] The addition of less cast iron slag in Comparative Example 3 weakened the constraint on the slippage and extension of the matrix molecular chain segments in the composite plate, resulting in a decrease in mechanical properties.

[0097] The addition of more cast iron slag in Comparative Example 4 increased the stress defects in the composite plate, resulting in a decrease in the mechanical properties of the composite plate.

[0098] In Comparative Example 5, cast iron slag was replaced with red mud, and the mechanical properties were somewhat reduced compared to Example 7, which illustrates the uniqueness and superiority of using cast iron slag as a filler.

[0099] (2) Tensile tests were performed on Comparative Example 1 and Example 3 using a universal testing machine to obtain tensile fracture surfaces and to measure the SEM images of the tensile fracture surfaces. The test results are as follows: Figure 1 As shown.

[0100] Figure 1 SEM images of the tensile fractures of the products obtained in Comparative Example 1 and Example 3 are shown. (a) is Comparative Example 1, and (b) is Example 3. Figure 1 It can be seen that, due to the use of unmodified cast iron slag powder in Comparative Example 1, its surface energy is high and its compatibility with the matrix molecular chains is poor, resulting in a large number of cross-sectional defects in the composite plate (such as...). Figure 1 As shown in the red highlighted part in the figure, after modification with coupling agent, the cross-sectional defects of the composite plate obtained in Example 3 are greatly reduced, the filler is in close contact with the matrix, and the interfacial adhesion is strong.

[0101] Figure 2 This is the XPS C1s orbital peak distribution diagram of the product obtained in Example 2. Figure 2It can be seen that the C1s orbitals of the modified cast iron slag are divided into CC peaks (binding energy 284.2 eV), CC peaks (binding energy 285.6 eV), and CO peaks (binding energy 286.4 eV). The CC peak with a binding energy of 284.2 eV represents C-Csp2 hybridization, i.e., graphitized carbon; the CC peak with a binding energy of 285.6 eV represents C-Csp3 hybridization, i.e., amorphous carbon; the CO peak indicates that the C on the CIOS surface is oxidized by air. Furthermore, the CO peak is relatively weak, indicating that only a trace amount of C is oxidized.

[0102] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A composite plate based on cast iron slag and textile materials, characterized in that, It consists of the following parts by weight of raw materials: 55-95 parts textile materials, 5-45 parts modified cast iron slag, 0.5-3 parts polyethylene wax, and 2-6 parts anti-aging auxiliaries; The anti-aging additive is an anti-ultraviolet agent and / or an antioxidant; The textile material includes one or more of polyethylene, polypropylene, nylon 66 fiber and polyester; the textile material is textile waste. The method for preparing the modified cast iron slag includes the following steps: The cast iron slag and coupling agent are mixed in ethanol and reacted to obtain modified cast iron slag. The coupling agent includes one or more of titanate coupling agents, aluminate coupling agents, rare earth coupling agents, and maleic anhydride compounds.

2. The composite sheet according to claim 1, characterized by The mass ratio of the cast iron slag, coupling agent, and ethanol is 5-45:0.5-2.5:250-1250; the particle size of the cast iron slag is 0.05 mm; the reaction includes the following steps: Ultrasonic dispersion for 30-50 minutes, vacuum filtration, vacuum drying at 50-60℃ for 30-50 minutes, drying at 90-120℃ for 60-70 minutes, then washing, filtering, and drying.

3. A method for the production of a composite panel based on foundry slag and textile material according to any one of claims 1-2, characterized in that, Includes the following steps: The textile material is crushed and mixed with the modified cast iron slag, polyethylene wax, and anti-aging additives, melted, pressed into shape, and left to stand to obtain the composite board based on cast iron slag and textile material.

4. The preparation method according to claim 3, characterized in that, The pulverization refers to pulverizing to a particle size of 0.2 mm.

5. The preparation method according to claim 3, characterized in that, The melting temperature is 160-200℃, and the time is 5-10 min; the pressure for pressing is 10-15 MPa, and the time is 5-7 min; the settling time is 18-26 h.

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