A filling material for mining and its preparation method

Abstract

This invention relates to the field of filler materials technology, specifically to a mine filler material and its preparation method. The filler material is composed of the following raw materials in parts by weight: 6-20 parts cement, 3-6 parts silica fume, 2-5 parts fly ash, 58-75 parts mixed materials, 1.2-1.8 parts polypropylene fiber, 2.5-3.0 parts bentonite, 3.0-3.5 parts citric acid gypsum, 1.0-1.5 parts anhydrous sodium sulfate, 0.8-1.5 parts water-reducing agent, and 5-8 parts water. Using the self-made water-reducing agent of this invention as a raw material for preparing the mine filler material can effectively improve the flowability and pumpability of the filler material, thereby improving its working performance. Moreover, the use of silica fume and fly ash as raw materials in this invention further improves the flowability and workability of the filler slurry, effectively ensuring the quality of the prepared mine filler material.

Description

Technical Field

[0001] This invention relates to the field of filler materials technology, specifically to a filler material for mining and its preparation method. Background Technology

[0002] Backfilling mining is a mining method that uses materials such as sand and stone to fill the goaf, forming a backfill body to support the roof and surrounding rock, preventing and reducing roof collapse and deformation, and alleviating pressure on the working face. It mainly includes hydraulic backfilling, mechanical backfilling, pneumatic backfilling, and cemented backfilling. Compared with longwall caving mining, backfilling mining has the following advantages:

[0003] 1. Effectively prevents roof collapse and reduces ground subsidence;

[0004] 2. Reduce pit prop consumption, reduce or eliminate the need for protective coal pillars, and improve recovery rate;

[0005] 3. The goaf filling is dense and not easily leaked, which can prevent spontaneous combustion when mining thick coal seams;

[0006] 4. Using waste tailings, gangue, or slag from factories and mines as backfill materials is beneficial to environmental protection in mining areas.

[0007] 5. Reduce the amount of gas emitted from goaf areas.

[0008] Currently, domestic filler materials are mainly cement-based, supplemented with fly ash, other fine aggregates such as sand, and some auxiliary additives. Although they have good setting effect and mechanical strength, their fluidity and pumpability are relatively poor, which reduces their workability to some extent.

[0009] Based on the above, the present invention provides a filling material for mining and its preparation method to solve the related technical problems mentioned above. Summary of the Invention

[0010] The purpose of this invention is to provide a filling material for mining and its preparation method. The prepared filling material not only has excellent flowability and pumpability, improving its working performance, but also further improves the flowability and workability of the filling slurry by using silica powder and fly ash as raw materials, effectively ensuring the quality of the prepared filling material for mining.

[0011] To achieve the above objectives, the present invention provides the following technical solution:

[0012] A filling material for mining, the filling material being composed of the following raw materials in parts by weight: 6-20 parts cement, 3-6 parts silica fume, 2-5 parts fly ash, 58-75 parts mixed materials, 1.2-1.8 parts polypropylene fiber, 2.5-3.0 parts bentonite, 3.0-3.5 parts citric acid gypsum, 1.0-1.5 parts anhydrous sodium sulfate, 0.8-1.5 parts water-reducing agent, and 5-8 parts water.

[0013] Furthermore, the preparation method of the water-reducing agent is as follows: Organic products are added to a reaction apparatus and heated to melt them. While stirring, 0.02–0.15% (by mass) of dimethylaminobenzene is added to the mixture. After thorough mixing, a compound solution is added dropwise to the reaction apparatus, and the addition is completed within 2–3 hours. After mechanical stirring, the temperature is raised to 145–158°C. Then, organic amines are added dropwise to the reaction apparatus while stirring for 3–5 hours. After the addition is complete, the temperature of the reaction apparatus is lowered to 55–65°C and maintained at this temperature for 70–100 minutes. Finally, the pH value of the mixture in the reaction apparatus is adjusted to 5.5–6.8. The resulting mixture in the reaction apparatus is the finished water-reducing agent.

[0014] Furthermore, the compound solution is prepared by mixing and stirring it evenly with 3.5 to 4.5 times the mass of the organic product, 0.15 to 0.6% of tert-butyl peroxide and 0.1 to 0.5% of 3-mercaptopropionic acid; and the amount of organic amine used is 20 to 45% of the molar amount of itaconic acid.

[0015] Furthermore, the organic amine is selected from any one of diethylenetriamine, triethylenetetraamine, and tetraethylenepentamine.

[0016] Furthermore, the method for preparing the organic product includes the following steps:

[0017] I. Add ethylene glycol monoacrylate to the reactor, then add 0.08-0.18% by mass of inhibitor and 3-8% by mass of reaction promoter to the reactor; after mixing and stirring evenly, seal the reactor, evacuate and replace with nitrogen to normal pressure, repeat this process 3 times; then turn on the stirring and heat to 103-108℃.

[0018] II. Continuously introduce epoxy organic compound into the reactor in a molar amount of 10 to 40 times that of ethylene glycol monoacrylate. Maintain the pressure inside the reactor within the range of 0.2 to 0.4 MPa by adjusting the amount of epoxy organic compound introduced. When the epoxy organic compound has reacted completely and the pressure inside the reactor no longer decreases, evacuate the reactor to below -0.08 MPa and maintain this condition for 30 to 40 minutes.

[0019] III. Introduce nitrogen gas into the reactor to restore the pressure inside to atmospheric pressure and lower the temperature inside the reactor to 85-90°C. Then, within 4-5 hours, slowly add glycidyl ether at a molar ratio of 10-25 times that of ethylene glycol monoacrylate to the reactor. After the addition is complete, continue to keep the reactor warm and stir for 4-6 hours. After the reaction is complete, allow the mixture obtained in the reactor to cool naturally to room temperature. Finally, add 20-30% phosphoric acid aqueous solution to the mixture to adjust the pH to 6.5-7.8 before discharging. The final product is the organic product.

[0020] Furthermore, the inhibitor is selected from any one of p-benzoquinone, hydroquinone, and 1,2-diphenyl-2-picrylhydrazine.

[0021] Furthermore, the reaction promoter is selected from any one of sodium ethoxylate, potassium ethoxylate, sodium hydroxide, and potassium hydroxide.

[0022] Furthermore, the epoxy organic compound is selected from any one of ethylene oxide, propylene oxide, or butane oxide.

[0023] Furthermore, the mixture is composed of stone and sand, with a sand content of 38-43%; the stone is heavy media tailings with a particle size of 5-8 mm; the sand is mining crushed stone with a particle size of 0.5-1.5 mm; the cement is 32.5 cement with a silica fume particle size of 0.15-0.4 μm; the fly ash has a particle size of 300-350 mesh; and the polypropylene fiber has a diameter of 25-30 μm and a length of 8-12 mm.

[0024] A method for preparing a filling material for mining includes the following steps: accurately weighing various raw materials required for preparing the filling material, then transferring each raw material into a mixing device, then starting the stirring device to mix for 5-10 seconds, and then slowly injecting water into the mixing device, and completely injecting it within 25-35 seconds; finally stirring for 3-5 minutes and then stopping the stirring, and the final mixed slurry in the mixing device is the finished filling material for mining.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. This invention uses ethylene glycol monoacrylate, glycidyl ether, and other raw materials. The use of a reaction promoter effectively increases the reaction rate, while the use of an inhibitor better protects the active double bonds in the ethylene glycol monoacrylate molecule, reducing the likelihood of the double bonds being damaged by free radicals generated in the system, thereby effectively improving the quality of the prepared organic product. The hydrophilicity and lipophilicity of the organic product prepared by this invention can be adjusted, and its relative molecular weight and degree of branching can also be artificially controlled. More importantly, the prepared organic product has high reactivity and can undergo copolymerization reactions with many unsaturated monomers.

[0027] 2. This invention uses self-made organic products, dimethylaminobenzene, organic amines, and a compound solution composed of itaconic acid, tert-butyl peroxide, and 3-mercaptopropionic acid as raw materials. Under the action of tert-butyl peroxide and 3-mercaptopropionic acid, the organic products and itaconic acid undergo a copolymerization reaction, ultimately producing a water-reducing agent with excellent water-reducing and dispersing effects. Using the self-made water-reducing agent of this invention as a raw material for preparing mining filler materials can effectively improve the flowability and pumpability of the filler materials, thus enhancing their working performance. Furthermore, this invention uses silica powder and fly ash as raw materials to further improve the flowability and workability of the filler slurry, effectively ensuring the quality of the prepared mining filler materials. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] A mine filler material, comprising the following raw materials in parts by weight: 6 parts cement, 3 parts silica fume, 2 parts fly ash, 58 parts mixed materials, 1.2 parts polypropylene fiber, 2.5 parts bentonite, 3.0 parts citric acid gypsum, 1.0 part anhydrous sodium sulfate, 0.8 parts water-reducing agent, and 5 parts water;

[0031] The mixture consists of stone and sand, with a sand ratio of 38%. The stone is heavy media tailings with a particle size of 5 mm. The sand is mining crushed stone with a particle size of 0.5 mm. The cement is 32.5 cement with a silica fume particle size of 0.15 μm. The fly ash has a particle size of 300 mesh. The polypropylene fiber has a diameter of 25 μm and a length of 8 mm.

[0032] The preparation method of the water-reducing agent is as follows: Organic products are added to a reaction apparatus and heated to melt. While stirring, 0.02% (by mass) of dimethylaminobenzene (by mass of the organic product) is added. After mixing and stirring evenly, a compound solution is added dropwise to the reaction apparatus, and the addition is completed within 2 hours. After mechanical stirring until homogeneous, the temperature is raised to 145℃. Then, over 3 hours, diethylenetriamine is added dropwise to the reaction apparatus while stirring. After the addition is complete, the temperature of the reaction apparatus is lowered to 55℃ and maintained at this temperature for 70 minutes. Finally, the pH value of the mixture in the reaction apparatus is adjusted to 5.5. The resulting mixture in the reaction apparatus is the finished water-reducing agent. The compound solution is prepared by mixing and stirring itatably with 3.5 times the mass of the organic product, 0.15% of tert-butyl peroxide, and 0.1% of 3-mercaptopropionic acid. The amount of organic amine used is 20% of the molar amount of itaconic acid.

[0033] The preparation method of organic products includes the following steps:

[0034] I. Add ethylene glycol monoacrylate to the reactor, then add p-benzoquinone (0.08% by mass of ethylene glycol monoacrylate) and sodium ethoxylate (3% by mass) to the reactor; after mixing and stirring evenly, seal the reactor, evacuate and replace with nitrogen to atmospheric pressure, repeat this process 3 times; then turn on the stirring and heat to 103℃.

[0035] II. Continuously introduce ethylene oxide into the reactor in a molar amount 10 times that of ethylene glycol monoacrylate. Maintain the pressure inside the reactor within 0.2 MPa by adjusting the amount of ethylene oxide introduced. When the ethylene oxide reaction is complete and the pressure inside the reactor no longer decreases, evacuate the reactor to below -0.08 MPa and maintain this condition for 30 minutes.

[0036] III. Introduce nitrogen gas into the reactor to restore the pressure inside to atmospheric pressure and lower the temperature inside the reactor to 85°C. Then, within 4 hours, slowly drip glycidyl ether, in a molar amount 10 times that of ethylene glycol monoacrylate, into the reactor. After the dripping is complete, continue to keep the reactor warm and stir for another 4 hours. After the reaction is complete, allow the mixture obtained in the reactor to cool naturally to room temperature. Finally, add 20% phosphoric acid aqueous solution to the mixture to adjust the pH to 6.5 before discharging. The final product is the organic product.

[0037] A method for preparing a filling material for mining includes the following steps: accurately weighing various raw materials required for preparing the filling material, then transferring each raw material into a mixing device, then starting the stirring device and mixing for 5 seconds, then slowly injecting water into the mixing device and completely injecting it within 25 seconds; finally, stirring for 3 minutes and then stopping the stirring, and the final mixed slurry in the mixing device is the finished filling material for mining.

[0038] Example 2

[0039] The preparation method of the mine filling material in this embodiment is basically the same as that in Example 1. The difference lies in the specific proportions of the raw materials used. The specific proportions of the raw materials used in this embodiment are as follows:

[0040] The filler material is composed of the following raw materials in parts by weight: 12 parts cement, 5 parts silica fume, 3 parts fly ash, 65 parts mixed materials, 1.5 parts polypropylene fiber, 2.8 parts bentonite, 3.2 parts citric acid gypsum, 1.3 parts anhydrous sodium sulfate, 1.2 parts water-reducing agent and 6 parts water;

[0041] The mixture consists of stone and sand, with the sand content being 40%. The stone is heavy media tailings with a particle size of 6mm. The sand is mining crushed stone with a particle size of 1.0mm. The cement is 32.5 cement with a silica fume particle size of 0.25μm. The fly ash has a particle size of 330 mesh. The polypropylene fiber has a diameter of 28μm and a length of 10mm.

[0042] The preparation method of the water-reducing agent is as follows: Organic products are added to a reaction apparatus and heated to melt. While stirring, 0.1% (by mass) of dimethylaminobenzene (by mass) of the organic product is added. After mixing and stirring evenly, a compound solution is added dropwise to the reaction apparatus, and the addition is completed within 3 hours. After mechanical stirring until homogeneous, the temperature is raised to 150℃. Then, within 4 hours, triethylenetetramine is added dropwise to the reaction apparatus while stirring. After the addition is complete, the temperature of the reaction apparatus is lowered to 60℃ and maintained at this temperature for 90 minutes. Finally, the pH value of the mixture in the reaction apparatus is adjusted to 6.2. The resulting mixture in the reaction apparatus is the finished water-reducing agent. The compound solution is prepared by mixing and stirring it evenly with 4.0 times the mass of the organic product of itaconic acid, 0.45% of tert-butyl peroxide, and 0.3% of 3-mercaptopropionic acid. The amount of organic amine used is 35% of the molar amount of itaconic acid.

[0043] The preparation method of organic products includes the following steps:

[0044] I. Add ethylene glycol monoacrylate to the reactor, then add hydroquinone (0.12% by mass of ethylene glycol monoacrylate) and potassium ethoxylate (5% by mass) to the reactor; after mixing and stirring evenly, seal the reactor, evacuate and replace with nitrogen to atmospheric pressure, repeat this process 3 times; then turn on the stirring and heat to 105℃.

[0045] II. Continuously introduce propylene oxide into the reactor in a molar amount 30 times that of ethylene glycol monoacrylate. Maintain the pressure inside the reactor within 0.3 MPa by adjusting the amount of propylene oxide introduced. When the propylene oxide reaction is complete and the pressure inside the reactor no longer decreases, evacuate the reactor to below -0.08 MPa and maintain this condition for 35 minutes.

[0046] III. Introduce nitrogen gas into the reactor to restore the pressure inside to atmospheric pressure and lower the temperature inside the reactor to 90°C. Then, within 5 hours, slowly drip glycidyl ether, in a molar amount 20 times that of ethylene glycol monoacrylate, into the reactor. After the dripping is complete, continue to keep the reactor warm and stir for another 5 hours. After the reaction is complete, allow the mixture obtained in the reactor to cool naturally to room temperature. Finally, add 25% phosphoric acid aqueous solution to the mixture to adjust the pH to 7.2 before discharging. The final product is the organic product.

[0047] Example 3

[0048] The preparation method of the mine filling material in this embodiment is basically the same as that in Example 1. The difference lies in the specific proportions of the raw materials used. The specific proportions of the raw materials used in this embodiment are as follows:

[0049] The filler material is composed of the following raw materials in parts by weight: 20 parts cement, 6 parts silica fume, 5 parts fly ash, 75 parts mixed materials, 1.8 parts polypropylene fiber, 3.0 parts bentonite, 3.5 parts citric acid gypsum, 1.5 parts anhydrous sodium sulfate, 1.5 parts water-reducing agent and 8 parts water;

[0050] The mixture consists of stone and sand, with a sand ratio of 43%. The stone is heavy media tailings with a particle size of 8 mm. The sand is mining crushed stone with a particle size of 1.5 mm. The cement is 32.5 cement with a silica fume particle size of 0.4 μm. The fly ash has a particle size of 350 mesh. The polypropylene fiber has a diameter of 30 μm and a length of 12 mm.

[0051] The preparation method of the water-reducing agent is as follows: Organic products are added to a reaction apparatus and heated to melt. While stirring, 0.15% (by mass) of dimethylaminobenzene (by mass of the organic product) is added. After mixing and stirring evenly, a compound solution is added dropwise to the reaction apparatus, and the addition is completed within 3 hours. After mechanical stirring until homogeneous, the temperature is raised to 158℃. Then, over 5 hours, tetraethylenepentamine is added dropwise to the reaction apparatus while stirring. After the addition is complete, the temperature of the reaction apparatus is lowered to 65℃ and maintained at this temperature for 100 minutes. Finally, the pH value of the mixture in the reaction apparatus is adjusted to 6.8. The resulting mixture is the finished water-reducing agent. The compound solution is prepared by mixing and stirring it evenly with 4.5 times the mass of the organic product, 0.6% of tert-butyl peroxide, and 0.5% of 3-mercaptopropionic acid. The amount of organic amine used is 45% of the molar amount of itaconic acid.

[0052] The preparation method of organic products includes the following steps:

[0053] I. Add ethylene glycol monoacrylate to the reactor, then add 0.18% by mass of 1,2-diphenyl-2-picrylhydrazyl and 8% by mass of sodium hydroxide to the reactor; after mixing and stirring evenly, seal the reactor, evacuate and replace with nitrogen to normal pressure, repeat this process 3 times; then turn on the stirring and heat to 108℃;

[0054] II. Continuously introduce 40 times the molar amount of ethylene glycol monoacrylate into the reactor, and maintain the pressure inside the reactor within the range of 0.4 MPa by adjusting the amount of ethylene glycol monoacrylate introduced; when the ethylene glycol monoacrylate reacts completely and the pressure inside the reactor no longer drops, evacuate the reactor to below -0.08 MPa and maintain this condition for 40 min.

[0055] III. Introduce nitrogen gas into the reactor to restore the pressure inside to atmospheric pressure and lower the temperature inside the reactor to 90°C. Then, within 5 hours, slowly drip glycidyl ether, in a molar amount 25 times that of ethylene glycol monoacrylate, into the reactor. After the dripping is complete, continue to keep the reactor warm and stir for 6 hours. After the reaction is complete, allow the mixture obtained in the reactor to cool naturally to room temperature. Finally, add 30% phosphoric acid aqueous solution to the mixture to adjust the pH to 7.8 before discharging. The final product is the organic product.

[0056] The difference between Comparative Example 1 and Example 1 is that: in this example, an equal amount of Concrete Power W20 polycarboxylate superplasticizer produced by Shenzhen Haichuan Engineering Technology Co., Ltd. is used to replace the superplasticizer prepared in this application.

[0057] Comparative Example 2 differs from Example 1 in that: in this example, JG-2H type polycarboxylate superplasticizer produced by Tianjin Zhongye Building Materials Co., Ltd. is used in an equal amount to replace the superplasticizer prepared in this application.

[0058] Performance testing: The relevant properties of the mining filler materials prepared in equal amounts as examples 1-3 and comparative examples 1-2 were tested, and the experimental data are recorded in the table below:

[0059]

[0060] By comparing and analyzing the relevant data in the table, it can be seen that the prepared filler material not only has excellent flowability and pumpability, improving its working performance, but also, by using silica powder and fly ash as raw materials, further improves the flowability and workability of the filler slurry, effectively ensuring the quality of the prepared mine filler material. Therefore, it is evident that the mine filler material prepared by this invention has a broader market prospect and is more suitable for promotion.

[0061] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0062] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A filling material for mining, characterized in that, The filler material is composed of the following raw materials in parts by weight: 6-20 parts cement, 3-6 parts silica fume, 2-5 parts fly ash, 58-75 parts mixed materials, 1.2-1.8 parts polypropylene fiber, 2.5-3.0 parts bentonite, 3.0-3.5 parts citric acid gypsum, 1.0-1.5 parts anhydrous sodium sulfate, 0.8-1.5 parts water-reducing agent, and 5-8 parts water; The mixture is composed of both stone and sand. The water-reducing agent is prepared as follows: Organic products are added to a reaction apparatus and heated to melt. While stirring, 0.02–0.15% (by mass) of dimethylaminobenzene is added to the mixture. After thorough mixing, a compound solution is added dropwise to the reaction apparatus, completing the addition over 2–3 hours. After mechanical stirring, the temperature is raised to 145–158°C. Then, over 3–5 hours, organic amines are added dropwise to the reaction apparatus while stirring. After the addition is complete, the temperature of the reaction apparatus is lowered to 55–65°C. The mixture is heated to ℃ and kept at this temperature for 70–100 min. Finally, the pH value of the mixture in the reaction equipment is adjusted to 5.5–6.

8. The resulting mixture in the reaction equipment is the finished water-reducing agent. The compound solution is prepared by mixing and stirring it evenly with 3.5–4.5 times the mass of the organic product, 0.15–0.6% of tert-butyl peroxide, and 0.1–0.5% of 3-mercaptopropionic acid. The amount of organic amine used is 20–45% of the molar amount of itaconic acid. The method for preparing the organic product includes the following steps: I. Add ethylene glycol monoacrylate to the reactor, then add 0.08-0.18% by mass of inhibitor and 3-8% by mass of reaction promoter to the reactor; after mixing and stirring evenly, seal the reactor, evacuate and replace with nitrogen to normal pressure, repeat this process 3 times; then turn on the stirring and heat to 103-108℃. II. Continuously introduce epoxy organic compound into the reactor in a molar amount of 10 to 40 times that of ethylene glycol monoacrylate. Maintain the pressure inside the reactor within the range of 0.2 to 0.4 MPa by adjusting the amount of epoxy organic compound introduced. When the epoxy organic compound has reacted completely and the pressure inside the reactor no longer decreases, evacuate the reactor to below -0.08 MPa and maintain this condition for 30 to 40 minutes. III. Introduce nitrogen gas into the reactor to restore the pressure inside to atmospheric pressure and lower the temperature inside the reactor to 85-90°C. Then, within 4-5 hours, slowly add glycidyl ether at a molar ratio of 10-25 times that of ethylene glycol monoacrylate to the reactor. After the addition is complete, continue to keep the reactor warm and stir for 4-6 hours. After the reaction is complete, allow the mixture obtained in the reactor to cool naturally to room temperature. Finally, add 20-30% phosphoric acid aqueous solution to the mixture to adjust the pH to 6.5-7.8 before discharging. The final product is the organic product.

2. The filling material for mining according to claim 1, characterized in that: The organic amine is selected from any one of diethylenetriamine, triethylenetetramine, and tetraethylenepentamine.

3. The filling material for mining according to claim 1, characterized in that: The inhibitor is selected from any one of p-benzoquinone, hydroquinone, and 1,2-diphenyl-2-picrylhydrazine.

4. The filling material for mining according to claim 1, characterized in that: The reaction promoter is selected from any one of sodium ethoxylate, potassium ethoxylate, sodium hydroxide, and potassium hydroxide.

5. A filling material for mining according to claim 1, characterized in that: The epoxy organic compound is selected from any one of ethylene oxide, propylene oxide, or butane oxide.

6. A filling material for mining according to claim 1, characterized in that: The sand content of the mixture is 38-43%; the stone material is heavy media separation tailings with a particle size of 5-8 mm; the sand material is mining crushed stone with a particle size of 0.5-1.5 mm; the cement is 32.5 cement with a silica powder particle size of 0.15-0.4 μm; the fly ash particle size is 300-350 mesh; and the polypropylene fiber has a diameter of 25-30 μm and a length of 8-12 mm.

7. A method for preparing a filling material for mining according to any one of claims 1 to 6, characterized in that, The process includes the following steps: accurately weigh all the raw materials required for preparing the filler material, then transfer each raw material into the mixing equipment, then start the stirring device and mix for 5-10 seconds, then slowly inject water into the mixing equipment and completely inject it within 25-35 seconds; finally, stir for 3-5 minutes and then stop stirring. The final mixed slurry in the mixing equipment is the finished product of the mine filler material.

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