A method for preparing solid waste-based filling material for compressed air energy storage pipelines

Abstract

This invention discloses a method for preparing a solid waste-based filling material for compressed air energy storage pipelines, comprising the following steps: (1) mixing ferrosilicon slag powder with acid solution and heating for extraction, separating the solid and liquid to obtain extraction residue and extraction solution. Carbon powder made from waste activated carbon is mixed with the extraction solution, then neutralized to neutral by adding alkali solution and heated to dryness. The solid product is then ground to obtain modified carbon powder. (2) The extraction residue and modified carbon powder are mixed and graphitized. After completion, the obtained solid product is crushed to obtain rigid filling particles. (3) Waste organic elastomer and graphitized modified carbon powder are mixed and heated for kneading. After completion, the mixture is extruded and pelletized to obtain elastic filling particles. These are then mixed with the rigid filling particles to obtain the filling material. The filling material prepared by this invention can not only effectively prevent the damage to the pipeline caused by cavern collapse, but also adapt well to pipeline deformation and reduce friction between the two.

Description

Technical Field

[0001] This invention relates to the field of compressed air energy storage technology, and specifically to a method for preparing a solid waste-based filling material for compressed air energy storage pipelines. Background Technology

[0002] Compressed air energy storage (CASS) technology is a novel energy storage technology that transfers excess electrical energy into compressed air and stores it in containers for later conversion back into electricity when needed. This technology is cleaner, producing no secondary pollutants or greenhouse gas emissions, making it a sustainable energy storage method. Currently, high-strength pipelines are typically used for compressed air storage, usually installed in underground tunnels to ensure safety and prevent leaks. However, traditional underground tunnel construction is not only costly but also time-consuming. To address these issues, researchers have proposed using abandoned mines, salt caverns, and other underground chambers instead of man-made tunnels for compressed air storage pipelines. This not only allows for the resource utilization of these underground chambers but also helps reduce the construction cost of CASS technology.

[0003] However, due to the risk of collapse during the use of these abandoned underground caverns, which could damage the compressed air storage pipelines, directly installing pipelines in such caverns poses a safety hazard. The inventors discovered that while filling the space between the pipeline and the cavern with materials such as gravel helps reduce / mitigate direct damage to the pipeline, the inflation / deflation process causes the pipeline itself to expand or contract to a certain extent. This creates friction between the pipeline's outer wall and the gravel or other filling materials, and repeated accumulation can easily damage the anti-corrosion layer of the pipeline's outer wall, leading to corrosion. Reduced strength in these areas makes the pipeline more susceptible to rupture and leakage under the high pressure of compressed air. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a method for preparing a solid waste-based filling material for compressed air energy storage pipelines. This filling material not only effectively prevents damage to the pipeline caused by cavern collapse, but also adapts well to pipeline deformation, reduces friction between the two, avoids damage to the pipeline, and extends its service life. Specifically, the technical solution of this invention is as follows.

[0005] A method for preparing a solid waste-based filling material for compressed air energy storage pipelines includes the following steps:

[0006] (1) The ferrosilicon slag powder is mixed with acid solution and heated for leaching. After the leaching is completed, the solid and liquid are separated to obtain leaching residue and leaching solution respectively. Carbon powder made from waste activated carbon is mixed with the leaching solution, and then alkali solution is added to neutralize it to neutrality and then heated to dryness. The solid product is ground to obtain modified carbon powder.

[0007] (2) The leaching residue is mixed with modified carbon powder and graphitized in a protective atmosphere. After the process is completed, it is cooled to room temperature and the resulting solid product is crushed to obtain rigid filling particles.

[0008] (3) The modified carbon powder from step (1) is graphitized in a protective atmosphere. After the graphite powder is obtained, it is mixed with waste organic elastomer powder and heated to melt for kneading. After the kneading is completed, it is extruded and pelletized, and cooled to obtain elastic filling particles. It is then mixed evenly with the rigid filling particles to obtain the solid waste-based filling material.

[0009] Furthermore, in step (1), the fineness of the ferrosilicon slag powder is 100~200 mesh.

[0010] Further, in step (1), the ratio of the ferrosilicon slag to the acid solution is 1g:15~35ml. Optionally, the mass fraction of the acid solution is 10~20%.

[0011] Further, in step (1), the acid solution includes at least one of sulfuric acid, nitric acid, etc.

[0012] Furthermore, in step (1), the heating temperature is 50~60℃ and the extraction time is 2~4 hours.

[0013] Further, in step (1), the ratio of the carbon powder to the extract is 1:5~12ml.

[0014] Further, in step (1), the alkaline solution includes at least one of sodium hydroxide, potassium hydroxide, ammonia, sodium carbonate, potassium carbonate, etc.

[0015] Further, in step (1), the heating temperature is 90~120℃, and the temperature is maintained at this temperature until the mass is constant.

[0016] Furthermore, in step (1), the modified carbon powder has a fineness of 300~500 mesh.

[0017] Further, in step (2), the mass ratio of the leaching residue to the modified carbon powder is 1:0.2~0.26.

[0018] Further, in steps (2) and (3), the graphitization treatment is carried out at a temperature of 1620~1800℃ for 6~10 hours and at a pressure of 0.3~0.8MPa. Optionally, the protective atmosphere includes nitrogen, argon, etc.

[0019] Furthermore, in step (2), the particle size distribution of the rigid filling particles is between 0.5 and 1.5 cm.

[0020] Further, in step (3), the graphite powder is 25-36% of the mass of the rubber powder. Optionally, the fineness of the organic elastomer powder is 80-150 mesh.

[0021] Further, in step (3), the organic elastomer includes any one of the following: styrene-butadiene-styrene block copolymer (SBS), polystyrene-poly(ethylene-butene)-polystyrene block copolymer (SEBS), thermoplastic dynamic vulcanizate (TPV), thermoplastic polyurethane elastomer (TPU).

[0022] Furthermore, in step (3), the particle size distribution of the elastic filling particles is between 0.5 and 1.5 cm.

[0023] Further, in step (3), the mass ratio of the elastic filling particles to the rigid filling particles is 1:3~4.5.

[0024] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0025] This invention employs both rigid and elastic filling particles as filling materials. When these particles are filled into the space between the outer wall of a compressed air storage pipeline and an abandoned mine shaft, they not only provide strong rigid support to resist mine collapse but also absorb and reduce the impact of the collapse, distributing the impact more evenly across the pipeline's outer wall, effectively preventing pipeline damage. Simultaneously, the elastic filling particles allow the filling material to deform, adapting well to the expansion and contraction of the pipeline during inflation / deflation. This ensures that even when the space between the pipeline and the abandoned mine shaft is filled with filling material, the pipeline can still accommodate volume deformation, guaranteeing normal operation. Furthermore, the filling material provides excellent lubrication and friction reduction between the filling material and the pipeline, effectively reducing friction during volume deformation and minimizing damage to the pipeline's outer wall from the rigid filling particles. Meanwhile, the excellent lubrication and friction reduction effect between the elastic filling particles, rigid filling particles, and pipelines effectively coordinates the expansion or contraction of the filling material volume caused by pipeline deformation, ensuring that the filling material remains tightly packed in the space outside the pipeline. This provides good compression support for the mine, helping to prevent and reduce damage caused by collapse. Therefore, this invention uses ferrosilicon slag as raw material to extract iron, and mixes the resulting leachate with carbon powder made from waste activated carbon, then converts it into modified carbon powder containing iron hydroxide using alkaline solution. The leachate residue and the modified carbon powder are then graphitized to prepare rigid filling particles. During this process, the hydroxide decomposes in the early stage of graphitization heating to form iron oxide, which further acts as a catalyst to lower the barrier for the transformation of the carbon powder into graphite, thereby reducing the graphite formation temperature. Simultaneously, the ferrosilicon slag melts during graphitization and mixes with the formed graphite. This utilizes the characteristics of ferrosilicon slag and waste activated carbon to not only transform them into rigid filling particles with self-lubricating and friction-reducing effects, but also lowers the graphite formation temperature, reduces energy consumption, and achieves solid waste utilization. Simultaneously, this invention further incorporates the graphitized modified carbon powder with waste organic elastomers to form elastic filler particles. During this process, the iron oxide formed from the iron hydroxide in the modified carbon powder not only lowers the barrier to the transformation of carbon powder to graphite but also improves the heat resistance of the elastomer. Furthermore, the iron oxide enhances the dispersibility of graphite powder and reduces its agglomeration within the elastomer, thereby further improving the heat resistance of the elastic filler particles. This reduces the aging of the organic matrix in the elastic filler particles caused by the increased temperature during pipeline closure during inflation, thus extending its service life. Attached Figure Description

[0026] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0027] Figure 1 The image shows a sample of the modified toner prepared in Example 1 below.

[0028] Figure 3 The image shows a sample of the rigid-filled particles prepared in Example 1 below.

[0029] Figure 2 The image shows a sample of graphite powder prepared using modified carbon powder in Example 1 below.

[0030] Figure 4 The image shows a sample of the elastically filled particles prepared in Example 1 below. Detailed Implementation

[0031] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer.

[0032] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as those skilled in the art. The reagents or raw materials used in this invention are readily available through conventional means, and unless otherwise specified, they are used in accordance with conventional methods or product instructions. Furthermore, any methods and materials similar to or equivalent to those described herein can be applied to the methods of this invention. The technical solution of this invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] A method for preparing a solid waste-based filling material for compressed air energy storage pipelines includes the following steps:

[0035] (1) Mix 100-mesh ferrosilicon slag powder with 17% sulfuric acid at a ratio of 1g:20ml, then heat in a water bath to 50℃ and keep warm for 4 hours for leaching, stirring continuously during the process. After completion, filter to obtain leaching residue and leaching solution respectively.

[0036] (2) The carbon powder made from waste activated carbon is mixed with the extract at a ratio of 1:8 ml and stirred evenly. Then, sodium hydroxide solution is added until neutral, and the mixture is heated to dryness at 110°C. The resulting solid product is ground and passed through a 400-mesh sieve to obtain the product shown below. Figure 1 The modified toner shown.

[0037] (3) The leaching residue and modified carbon powder are mixed at a mass ratio of 1:0.23 and stirred evenly. Then, the mixture is placed in a nitrogen atmosphere furnace and heated to 1720℃ for 9 hours for graphitization treatment. The pressure is set to 0.5MPa. After completion, the mixture is cooled to room temperature, and the resulting solid product is crushed and sieved to obtain rigid filling particles with a particle size distribution between 0.5 and 1.5 cm (e.g., Figure 2 (As shown).

[0038] (4) The modified carbon powder from step (1) is placed in a nitrogen atmosphere furnace and heated to 1720°C for 9 hours for graphitization treatment, with the pressure set at 0.5 MPa. After completion, the obtained graphite powder (such as...) Figure 3 The graphite powder (as shown) is mixed with waste thermoplastic dynamic vulcanized rubber (TPV101-80) powder with a fineness of 120 mesh, wherein the graphite powder accounts for 30.4% of the mass of the rubber powder. The resulting mixture is then heated until the rubber powder melts and kneaded. After completion, it is extruded and pelletized. After cooling, elastic filling particles with a particle size distribution between 0.8 and 1.1 cm are obtained (e.g.,...). Figure 4 (As shown). Mix it with the rigid filling particles at a mass ratio of 1:4 to obtain the solid waste-based filling material.

[0039] Performance test: (1) The solid waste-based filling material prepared in this embodiment is loaded into a container and compacted to form a flat upper surface, which is higher than the container. Then a steel plate is placed on the upper surface, and a weight is placed at the center of the steel plate to apply normal pressure. The normal pressure applied by the steel plate and the weight is recorded as G. Then the steel plate is pulled horizontally with a tension gauge and the tension F is recorded. The ratio of the tension F to G is the coefficient of friction. The smaller the value, the higher the lubrication and friction reduction performance of the solid waste-based filling material prepared in this embodiment. (2) The heat aging resistance of the elastic filling particles prepared in this embodiment was tested according to the "Determination of Tensile Stress-Strain Properties of Vulcanized Rubber or Thermoplastic Rubber" (GB / T 528-2009). That is, the rubber extruded in step (4) was made into test specimens, and then the tensile strength and elongation at break were tested before and after heat aging treatment (170℃ for 96 hours). The decrease rate of these two test indicators was calculated. The smaller the decrease, the higher the heat aging resistance of the elastic filling particles. The results are shown in the table below:

[0040] .

[0041] Example 2

[0042] A method for preparing a solid waste-based filling material for compressed air energy storage pipelines includes the following steps:

[0043] (1) Mix ferrosilicon slag powder with a fineness of 200 mesh and nitric acid with a mass fraction of 10% at a ratio of 1g:35ml, then heat in a water bath to 60℃ and keep warm for 3 hours for extraction, stirring continuously during the process. After completion, filter to obtain extraction residue and extraction liquid respectively.

[0044] (2) The carbon powder made from waste activated carbon is mixed with the extract at a ratio of 1:5 ml and stirred evenly. Then, sodium hydroxide solution is added until neutral and heated to dryness at 90°C. The resulting solid product is ground and passed through a 300-mesh sieve to obtain modified carbon powder.

[0045] (3) The leaching residue and modified carbon powder are mixed at a mass ratio of 1:0.2 and stirred evenly. Then, the mixture is placed in a nitrogen atmosphere furnace and heated to 1620℃ for 10 hours for graphitization treatment. The pressure is set to 0.8MPa. After completion, the mixture is cooled to room temperature, and the resulting solid product is crushed and sieved to obtain rigid filling particles with a particle size distribution between 0.5 and 1.5 cm.

[0046] (4) The modified carbon powder from step (1) is placed in a nitrogen atmosphere furnace and heated to 1620℃ for 10 hours for graphitization treatment, with the pressure set at 0.8 MPa. After completion, the obtained graphite powder is mixed with waste thermoplastic dynamic vulcanized rubber (TPV101-80) powder with a fineness of 150 mesh, wherein the graphite powder accounts for 25% of the mass of the rubber powder. The resulting mixed powder is then heated until the rubber powder melts and then kneaded. After completion, it is extruded and pelletized, and after cooling, elastic filling particles with a particle size distribution between 1.2 and 1.5 cm are obtained. It is then mixed with the rigid filling particles at a mass ratio of 1:3 to obtain solid waste-based filling material.

[0047] The friction coefficient of the solid waste-based backfill material and the heat aging resistance of the elastic backfill particles prepared in this embodiment were tested using the same method as in Example 1 above. The results are shown in the table below:

[0048] .

[0049] Example 3

[0050] A method for preparing a solid waste-based filling material for compressed air energy storage pipelines includes the following steps:

[0051] (1) Mix ferrosilicon slag powder with a fineness of 180 mesh and sulfuric acid with a mass fraction of 20% at a ratio of 1 g: 15 ml, then heat in a water bath to 55°C and keep warm for 2 hours for leaching, stirring continuously during the process. After completion, filter to obtain leaching residue and leaching solution respectively.

[0052] (2) The carbon powder made from waste activated carbon is mixed with the extract at a ratio of 1:12 ml and stirred evenly. Then, sodium hydroxide solution is added until neutral and heated to dryness at 120°C. The resulting solid product is ground and passed through a 500-mesh sieve to obtain modified carbon powder.

[0053] (3) The leaching residue and modified carbon powder are mixed at a mass ratio of 1:0.26 and stirred evenly. Then, the mixture is placed in a nitrogen atmosphere furnace and heated to 1800℃ for 6 hours for graphitization treatment. The pressure is set to 0.3MPa. After completion, the mixture is cooled to room temperature, and the resulting solid product is crushed and sieved to obtain rigid filling particles with a particle size distribution between 0.5 and 1.5 cm.

[0054] (4) The modified carbon powder from step (1) is placed in a nitrogen atmosphere furnace and heated to 1800℃ for 6 hours for graphitization treatment, with the pressure set at 0.3 MPa. After completion, the obtained graphite powder is mixed with waste thermoplastic dynamic vulcanized rubber (TPV101-80) powder with a fineness of 80 mesh, wherein the graphite powder accounts for 36% of the mass of the rubber powder. The resulting mixed powder is then heated until the rubber powder melts and then kneaded. After completion, it is extruded and pelletized, and after cooling, elastic filling particles with a particle size distribution between 0.5 and 0.9 cm are obtained. It is then mixed with the rigid filling particles at a mass ratio of 1:4.5 to obtain solid waste-based filling material.

[0055] The friction coefficient of the solid waste-based backfill material and the heat aging resistance of the elastic backfill particles prepared in this embodiment were tested using the same method as in Example 1 above. The results are shown in the table below:

[0056] .

[0057] Example 4

[0058] A method for preparing a solid waste-based filling material for compressed air energy storage pipelines, compared with Example 1 above, the modified carbon powder in this example is prepared by the following method:

[0059] (1) Mix 100-mesh ferrosilicon slag powder with water at a ratio of 1g:20ml, then heat in a water bath to 50℃ and keep warm for 4 hours for extraction, stirring continuously during the process. After completion, filter to obtain extraction residue and extraction liquid respectively.

[0060] (2) The carbon powder made from waste activated carbon is mixed with the extract at a ratio of 1:8 ml and stirred evenly. Then, it is heated to dryness at 110°C. The resulting solid product is ground and passed through a 400-mesh sieve to obtain modified carbon powder.

[0061] The friction coefficient of the solid waste-based backfill material and the heat aging resistance of the elastic backfill particles prepared in this embodiment were tested using the same method as in Example 1 above. The results are shown in the table below:

[0062] .

[0063] Example 5

[0064] A method for preparing solid waste-based filling material for compressed air energy storage pipelines, compared with Example 2 above, the elastic filling particles in this example are prepared by the following method:

[0065] (1) Mix ferrosilicon slag powder with a fineness of 200 mesh and nitric acid with a mass fraction of 10% at a ratio of 1g:35ml, then heat in a water bath to 60℃ and keep warm for 3 hours for extraction, stirring continuously during the process. After completion, filter to obtain extraction residue and extraction liquid respectively.

[0066] (2) The carbon powder made from waste activated carbon is mixed with the extract at a ratio of 1:5 ml and stirred evenly. Then, sodium hydroxide solution is added until neutral and heated to dryness at 90°C. The resulting solid product is ground and passed through a 300-mesh sieve to obtain modified carbon powder.

[0067] (3) The waste thermoplastic dynamic vulcanized rubber (TPV101-80) powder with a fineness of 150 mesh is mixed with the modified carbon powder, and the modified carbon powder is 25% of the mass of the rubber powder. The resulting mixed powder is then heated until the rubber powder melts and then mixed. After completion, it is extruded and pelletized. After cooling, elastic filling particles with a particle size distribution between 1.2 and 1.5 cm are obtained.

[0068] The friction coefficient of the solid waste-based backfill material and the heat aging resistance of the elastic backfill particles prepared in this embodiment were tested using the same method as in Example 1 above. The results are shown in the table below:

[0069] .

[0070] Example 6

[0071] A method for preparing solid waste-based filling material for compressed air energy storage pipelines, compared with Example 1 above, the rigid filling particles in this example are prepared by the following method:

[0072] (1) Mix 100-mesh ferrosilicon slag powder with 17% sulfuric acid at a ratio of 1g:20ml, then heat in a water bath to 50℃ and keep warm for 4 hours for leaching, stirring continuously during the process. After completion, filter to obtain the leaching residue for later use.

[0073] (2) The leaching residue is heated to 1720°C in a furnace and held for 9 hours, with the pressure set at 0.5 MPa. After completion, it is cooled to room temperature, and the obtained solid product is crushed and sieved to obtain rigid filling particles with a particle size distribution between 0.5 and 1.5 cm.

[0074] The friction coefficient of the solid waste-based filling material prepared in this embodiment was tested using the same method as in Example 1 above. The result was a friction coefficient of 0.587. It can be seen that its lubrication and friction reduction effect is significantly reduced compared to Example 1.

[0075] Example 7

[0076] A method for preparing a solid waste-based filling material for compressed air energy storage pipelines includes the following steps:

[0077] (1) Mix 180-mesh mineral powder with 20% sulfuric acid at a ratio of 1g:15ml, then heat in a water bath to 55℃ and keep warm for 2 hours for leaching, stirring continuously during the process. After completion, filter to obtain leached mineral powder residue and leaching solution respectively.

[0078] (2) The carbon powder made from waste activated carbon is mixed with the extract at a ratio of 1:12 ml and stirred evenly. Then, sodium hydroxide solution is added until neutral and heated to dryness at 120°C. The resulting solid product is ground and passed through a 500-mesh sieve to obtain modified carbon powder.

[0079] (3) The leached mineral powder residue and modified carbon powder are mixed at a mass ratio of 1:0.26 and stirred evenly. Then, the mixture is placed in a nitrogen atmosphere heating furnace and heated to 1800℃ for 6 hours for graphitization treatment. The pressure is set to 0.3MPa. After completion, the mixture is cooled to room temperature, and the resulting solid product is crushed and sieved to obtain rigid filling particles with a particle size distribution between 0.5 and 1.5 cm.

[0080] (4) The modified carbon powder from step (1) is placed in a nitrogen atmosphere furnace and heated to 1800℃ for 6 hours for graphitization treatment, with the pressure set at 0.3 MPa. After completion, the obtained graphite powder is mixed with waste thermoplastic dynamic vulcanized rubber (TPV101-80) powder with a fineness of 80 mesh, wherein the graphite powder accounts for 36% of the mass of the rubber powder. The resulting mixed powder is then heated until the rubber powder melts and then kneaded. After completion, it is extruded and pelletized, and after cooling, elastic filling particles with a particle size distribution between 0.5 and 0.9 cm are obtained. It is then mixed with the rigid filling particles at a mass ratio of 1:4.5 to obtain solid waste-based filling material.

[0081] The friction coefficient of the solid waste-based backfill material and the heat aging resistance of the elastic backfill particles prepared in this embodiment were tested using the same method as in Example 1 above. The results are shown in the table below:

[0082] .

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for the preparation of a solid waste-based backfill material for compressed air energy storage pipelines, characterized in that, The method comprises the following steps: (1) mixing silicon-iron slag powder with acid solution and then heating to leach, and after completion, solid-liquid separation is performed to obtain leaching residue and leaching solution respectively; carbon powder made of waste activated carbon is mixed with the leaching solution, and then after neutralization to neutral by adding alkali solution, heating and drying, the solid product is ground to obtain modified carbon powder; (2) mixing the leaching residue with the modified carbon powder and then performing graphitization treatment in a protective atmosphere, and after cooling to room temperature, the obtained solid product is broken to obtain rigid filling granular material; (3) performing graphitization treatment on the modified carbon powder in step (1) in a protective atmosphere, and after completion, the obtained graphite powder is mixed with waste organic elastomer powder, and then heating to melt to perform mixing, and after completion, extruding and granulating, and after cooling, elastic filling granular material is obtained; and after mixing the elastic filling granular material with the rigid filling granular material, the solid waste-based filling material is obtained.

2. The method of claim 1, wherein the method further comprises: In step (1), the ratio of the silicon-iron slag to the acid solution is 1g: 15-35ml.

3. The method of claim 2, wherein the method further comprises: In step (1), the mass fraction of the acid solution is 10-20%.

4. The method of claim 2, wherein the method further comprises: In step (1), the fineness of the silicon-iron slag powder is 100-200 mesh.

5. The method of producing a solid waste-based fill material for compressed air energy storage pipelines of claim 1, wherein, In step (1), the acid solution comprises at least one of sulfuric acid and nitric acid.

6. The method of producing a solid waste-based fill material for compressed air energy storage pipelines of claim 1, wherein, In step (1), the heating temperature is 50-60℃, and the leaching time is 2-4 hours.

7. The method of producing a solid waste-based fill material for compressed air energy storage pipelines of claim 1, wherein, In step (1), the ratio of the carbon powder to the leaching solution is 1: 5-12ml.

8. The method of producing a solid waste-based fill material for compressed air energy storage pipelines of claim 1, wherein, In step (1), the alkali solution comprises at least one of sodium hydroxide, potassium hydroxide, ammonia water, sodium carbonate and potassium carbonate.

9. The method of claim 8, wherein the method further comprises: In step (1), the heating temperature is 90-120℃, and heating is performed at the temperature until the mass is constant.

10. The method of claim 8, wherein the method further comprises: In step (1), the fineness of the modified carbon powder is 300-500 mesh.

11. The method of producing a solid waste-based fill material for compressed air energy storage pipelines of claim 1, wherein, In step (2), the mass ratio of the leaching residue to the modified carbon powder is 1: 0.2-0.

26.

12. The method of producing a solid waste-based fill material for compressed air energy storage pipelines of claim 1, wherein, In steps (2) and (3), the temperature of the graphitization treatment is 1620-1800℃, the time is 6-10 hours, and the pressure is 0.3-0.8MPa.

13. The method of claim 12, wherein the method further comprises: In step (2), the protective atmosphere comprises one of nitrogen and argon.

14. The method of claim 12, wherein the method further comprises: In step (2), the particle size distribution of the rigid filling granular material is between 0.5-1.5cm.

15. The method of producing a solid waste-based fill material for compressed air energy storage pipelines of claim 1, wherein, In step (3), the graphite powder accounts for 25-36% of the mass of the organic elastomer powder.

16. The method of claim 15, wherein the method further comprises: In step (3), the organic elastomer comprises any one of styrene-butadiene-styrene block copolymer, polystyrene-poly(ethylene-butylene)-polystyrene block copolymer, thermoplastic dynamic vulcanized rubber, and thermoplastic polyurethane elastomer rubber.

17. The method of producing a solid waste-based fill material for compressed air energy storage pipelines of claim 15, wherein, In step (3), the fineness of the organic elastomer powder is 80-150 mesh.

18. The method of producing a solid waste-based fill material for compressed air energy storage pipelines of claim 15, wherein, In step (3), the particle size distribution of the elastic filling granular material is between 0.5-1.5cm.

19. A method of preparing a solid waste-based backfill material for compressed air energy storage pipelines according to any one of claims 1-18, wherein, In step (3), the mass ratio of the elastic filling granular material to the rigid filling granular material is 1: 3-4.5.

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