Method for preparing ceramsite sand fracturing propping agent by taking asbestos ore as raw material

Abstract

The invention relates to the technical field of fracturing propping agents, in particular to a method for preparing a ceramsite sand fracturing propping agent by taking asbestos ore as a raw material. The ceramsite sand fracturing propping agent comprises inner core particles and an outer layer covering film, wherein the inner core particles comprise the following components in parts by weight: 25-35 parts of asbestos ore, 40-50 parts of bauxite, 10-20 parts of solid waste ceramsite sand, 1-3 parts of a sintering aid, 15-25 parts of potassium feldspar, 3-8 parts of dolomite, 8-12 parts of kaolin, 1-2 parts of titanium oxide and 0.5-1.5 parts of manganese powder; and the outer-layer covering film is modified epoxy resin. The ceramsite sand fracturing propping agent prepared by the invention not only has excellent mechanical property and high flow conductivity, but also has excellent hydrophobic property, so that the service life of the ceramsite sand fracturing propping agent is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of fracturing proppants, in particular to a method for preparing ceramsite sand fracturing proppants by using asbestos ore as a raw material. Background Art

[0002] With the continuous development of oil and gas resources, the demand for fracturing proppants is increasing. Traditional fracturing proppants such as quartz sand and ceramsite have limitations, such as high density, low strength, and prone to sedimentation and flowback. Asbestos, as a natural mineral resource, possesses unique physical and chemical properties. Its main components include silicate minerals, which can be used to prepare ceramsite sand fracturing proppants with excellent performance. Therefore, exploring methods to prepare ceramsite sand fracturing proppants using asbestos as a raw material is of great significance for improving the performance of fracturing proppants, reducing production costs, and realizing the resource utilization of asbestos.

[0003] Currently, there are two main types of resin-coated proppants: pre-cured resin-coated proppants and cured resin-coated proppants. Methods for hydrophobic modification of solid surfaces primarily include physical construction and surface coating. However, the physical construction method struggles to precisely control the surface roughness and microstructure, resulting in unstable hydrophobicity. In the coating modification method, low-surface-energy materials such as silicon or surfactants with hydrophobic groups can detach or age over long-term use, affecting hydrophobic properties.

[0004] Therefore, we propose a method for preparing ceramsite sand fracturing proppant using asbestos ore as raw material. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for preparing ceramsite sand fracturing proppant using asbestos ore as raw material, so as to solve the problems raised in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions: A ceramsite sand fracturing proppant prepared using asbestos ore as raw material comprises core particles and an outer coating. The core particles comprise the following components by weight: 25-35 parts of asbestos ore, 40-50 parts of bauxite, 10-20 parts of solid waste ceramsite sand, 1-3 parts of a sintering aid, 15-25 parts of potassium feldspar, 3-8 parts of dolomite, 8-12 parts of kaolin, 1-2 parts of titanium oxide, and 0.5-1.5 parts of manganese powder; the outer coating is a modified epoxy resin.

[0007] Furthermore, the sintering aid is composed of silica fume and magnesia clay in a mass ratio of 1: (1-2).

[0008] Furthermore, the preparation method of the modified epoxy resin is as follows: Step 1: maleic anhydride, polyethylene glycol monomethyl ether, p-toluenesulfonic acid, hydroquinone and toluene are uniformly mixed, reacted at 115-120° C. for 5-7 hours, and distilled under reduced pressure to obtain a maleate compound; Step 2: Under nitrogen protection, reacting the amino-terminated fluorinated organosilicon and the maleate compound at 50-60° C. for 8-10 hours to obtain a hydrophobic modifier; Step 3: Under nitrogen protection, polyester polyol, diphenylmethane diisocyanate and dibutyltin dilaurate are mixed evenly, reacted at 70-80°C for 2-3 hours, cooled to 40-50°C, a hydrophobic modifier is added, and the reaction is continued for 1-2 hours to obtain a polyurethane prepolymer; Step 4: Stir the epoxy resin at 40-50°C for 10-20 minutes, add the polyurethane prepolymer under nitrogen protection, raise the temperature to 70-80°C, and keep the temperature to react for 4-6 hours to obtain the modified epoxy resin.

[0009] Furthermore, the mass ratio of maleic anhydride, polyethylene glycol monomethyl ether, p-toluenesulfonic acid, hydroquinone and toluene is 1: (8-10): (0.03-0.05): (0.02-0.04): (5-10).

[0010] Furthermore, the molar ratio of the amino-terminated fluorinated organosilicon to the maleate compound is 1:(0.5-1.0).

[0011] Furthermore, the mass ratio of the polyester polyol, diphenylmethane diisocyanate and dibutyltin dilaurate is 1:(6-8):(0.01-0.03).

[0012] Furthermore, the mass of the hydrophobic modifier is 6-16% of the mass of diphenylmethane diisocyanate.

[0013] Furthermore, the mass ratio of the epoxy resin to the polyurethane prepolymer is 1:(0.1-0.3).

[0014] Furthermore, the preparation method of the amino-terminated fluorinated silicone is as follows: Under nitrogen protection, 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane, ethylenediamine and water are mixed evenly, reacted at 60-70°C for 8-10 hours, heated to 100°C, and vacuumed to remove moisture and ethylenediamine, 3-(2-aminoethylamino)propyltrimethoxysilane is added dropwise over 30-40 minutes, reacted at 60-70°C for 3-5 hours, heated to 110-120°C, and vacuumed to obtain amino-terminated fluorinated silicone.

[0015] Furthermore, the mass ratio of the 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane, ethylenediamine and water is 1:(0.15-0.30):(0.05-0.10).

[0016] Furthermore, the mass of the 3-(2-aminoethylamino)propyltrimethoxysilane is 1-3 times the mass of 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane.

[0017] In the above technical scheme, a maleate compound is synthesized using maleic anhydride and polyethylene glycol monomethyl ether as raw materials, p-toluenesulfonic acid as a catalyst, hydroquinone as an inhibitor, and toluene as a water-carrying agent. A double bond is introduced, and then the maleate compound reacts with amino-terminated fluorinated silicone through Michael addition to obtain a hydrophobic modifier. The long polyethylene glycol (PEG) chain of the maleate compound can effectively form a protective layer on the surface of the proppant, preventing inter-particle agglomeration through the steric hindrance effect, thereby improving the performance and stability of the material. By adding a hydrophobic modifier to the polyurethane, the introduction of a fluorinated chain segment with strong hydrophobicity can reduce the hydrophilicity of the surface of the fracturing proppant, making it difficult for water to spread and penetrate the proppant surface. Finally, the introduction of polyurethane into the modified epoxy resin can significantly improve the toughness and impact resistance of the material.

[0018] A method for preparing ceramsite sand fracturing proppant using asbestos ore as raw material comprises the following steps: Step S1: Grinding asbestos ore, bauxite, solid waste ceramsite sand, sintering aid, potassium feldspar, dolomite, kaolin, titanium oxide, and manganese powder, and sieving to obtain a mixture; granulating the mixture to obtain raw material particles; Step S2: drying, sintering, and cooling the raw material particles to obtain core particles; Step S3: preheating the core particles, adding modified epoxy resin, stirring evenly, then adding curing agent and stirring evenly, drying and curing to obtain ceramsite sand fracturing proppant.

[0019] Furthermore, the screening is through a 325 mesh sieve.

[0020] Furthermore, the mass ratio of the modified epoxy resin to the core particles is (5-15):100.

[0021] Furthermore, the curing agent is one of aliphatic amine, aromatic amine, and polyether amine, and the amount of the curing agent added is 10-20% of the mass of the modified epoxy resin.

[0022] Furthermore, the sintering temperature is 1200-1300° C., and the sintering time is 3-5 hours.

[0023] Furthermore, the preheating temperature is 130-150°C.

[0024] Furthermore, the drying and curing conditions are: first drying at 80-100° C. for 2-3 hours, and then drying at 120-130° C. for 3-5 hours.

[0025] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention discloses a method for preparing ceramsite sand fracturing proppant using asbestos ore as raw material. By replacing a portion of bauxite with asbestos ore and solid waste ceramsite sand, this achieves resource recycling. Furthermore, the combination of asbestos ore and solid waste ceramsite sand reduces the sintering temperature of the ceramsite, promotes its formation and densification, and improves the strength and wear resistance of the fracturing proppant. Kaolin, with its excellent plasticity and refractory properties, improves the forming properties of the ceramsite and the strength of the final product. Titanium oxide enhances the thermal stability of the ceramsite and may also enhance the strength and wear resistance of the fracturing proppant. Manganese powder improves the material's wear resistance and may form a suitable molten phase during the sintering process, enhancing the product's mechanical properties. This combination of ingredients allows for efficient resource utilization and reduces production costs. Furthermore, by improving physical and chemical properties, it enhances the strength, wear resistance, and stability of the fracturing proppant, thereby improving its application in oil and gas production.

[0026] 2. The present invention discloses a method for preparing ceramsite sand fracturing proppant using asbestos ore as raw material, wherein the core particles are coated with modified epoxy resin, which can further improve the strength and flow conductivity of the proppant, making the proppant less likely to break and deform when subjected to formation pressure, thereby better maintaining the open state of the cracks and providing a stable channel for oil and gas flow. At the same time, the fluorine-containing segment in the hydrophobic modifier has a strong hydrophobicity, which can reduce the hydrophilicity of the surface of the fracturing proppant, making it difficult for water to spread and penetrate the surface of the proppant. During the fracturing operation, it can effectively prevent the erosion of the proppant by the moisture in the fracturing fluid, reduce the problems of proppant strength loss and structural damage caused by moisture, improve the stability of the proppant in the water environment, and extend its service life. DETAILED DESCRIPTION

[0027] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0028] Unless otherwise specified, the following parts are all parts by mass. It should be noted that the raw materials involved in the present invention are purchased from manufacturers without any special restrictions. Examples thereof include (in this embodiment) asbestos ore: item number 01; bauxite: secondary, Al2O3 content 70%, silica content 20%; silica fume: primary; magnesia clay: primary, magnesium oxide content 24-25%; potassium feldspar: K2O content 9-10%, Al2O3 content 17%, SiO2 content 66%; kaolin: 325 mesh; titanium oxide: model A-120; manganese powder: electrolytic manganese powder; epoxy resin: bisphenol A type epoxy resin, brand E-51; curing agent: polyetheramine D230; polyester polyol: brand CMA-1024, hydroxyl value 106-118 mgKOH / g; polyethylene glycol monomethyl ether: model P2183.

[0029] Example 1: A method for preparing ceramsite sand fracturing proppant using asbestos ore as raw material, comprising the following process: Step S1: Grind 25 parts of asbestos ore, 40 parts of bauxite, 10 parts of solid waste ceramsite sand, 1 part of a sintering aid, 15 parts of potassium feldspar, 3 parts of dolomite, 8 parts of kaolin, 1 part of titanium oxide, and 0.5 part of manganese powder, and pass the mixture through a 325-mesh sieve to obtain a mixture; granulate the mixture to obtain raw material particles; the sintering aid is composed of silica fume and magnesia clay in a mass ratio of 1:1; Step S2: drying, sintering (sintering temperature is 1200°C, sintering time is 3 hours), and cooling the raw material particles to obtain core particles; Step S3: preheating 100 parts of the core particles to 130°C, adding 5 parts of a modified epoxy resin, stirring evenly, then adding 0.5 parts of a curing agent, stirring evenly, and drying and curing (first drying at 80°C for 2 hours, then drying at 120°C for 3 hours) to form an outer coating to obtain a ceramsite sand fracturing proppant; The preparation method of modified epoxy resin is as follows: Step 1: maleic anhydride, polyethylene glycol monomethyl ether, p-toluenesulfonic acid, hydroquinone and toluene are uniformly mixed in a mass ratio of 1:8:0.03:0.02:5, reacted at 115°C for 5 hours, toluene and water were removed, and the mixture was distilled under reduced pressure to obtain a maleate compound; Step 2: Under nitrogen protection, reacting the amino-terminated fluorinated organosilicon and the maleate compound at 50° C. for 8 hours to obtain a hydrophobic modifier; the molar ratio of the amino-terminated fluorinated organosilicon to the maleate compound is 1:0.5; Step 3: Under nitrogen protection, 0.5 parts of polyester polyol, 3 parts of diphenylmethane diisocyanate and 0.005 parts of dibutyltin dilaurate were mixed evenly, reacted at 70°C for 2 hours, cooled to 40°C, 0.18 parts of hydrophobic modifier were added, and the reaction was continued for 1-2 hours to obtain a polyurethane prepolymer; Step 4: Stir 5 parts of epoxy resin at 40°C for 10 minutes, add 0.5 parts of polyurethane prepolymer under nitrogen protection, heat to 70°C, and keep the temperature for 4 hours to obtain modified epoxy resin; The preparation method of amino-terminated fluorinated silicone is as follows: Under nitrogen protection, 0.2 parts of 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane, 0.03 parts of ethylenediamine and 0.01 parts of water were mixed evenly, reacted at 60°C for 8 hours, heated to 100°C, and vacuumed to remove moisture and ethylenediamine, and 0.2 parts of 3-(2-aminoethylamino)propyltrimethoxysilane were added dropwise for 30 minutes. The mixture was reacted at 60°C for 3 hours, heated to 110°C, and vacuumed to obtain amino-terminated fluorinated silicone.

[0030] Example 2: A method for preparing ceramsite sand fracturing proppant using asbestos ore as raw material, comprising the following process: Step S1: grinding 30 parts of asbestos ore, 45 parts of bauxite, 15 parts of solid waste ceramsite sand, 2 parts of sintering aid, 20 parts of potassium feldspar, 5 parts of dolomite, 10 parts of kaolin, 1.5 parts of titanium oxide, and 1 part of manganese powder, and passing the mixture through a 325-mesh sieve to obtain a mixture; granulating the mixture to obtain raw material particles; the sintering aid is composed of silica fume and magnesia clay in a mass ratio of 1:1.5; Step S2: drying, sintering (sintering temperature is 1250°C, sintering time is 4 hours), and cooling the raw material particles to obtain core particles; Step S3: preheating 100 parts of the core particles to 140°C, adding 10 parts of a modified epoxy resin, stirring evenly, then adding 1.5 parts of a curing agent, stirring evenly, and drying and curing (first drying at 90°C for 2.5 hours, then drying at 125°C for 4 hours) to form an outer coating to obtain a ceramsite sand fracturing proppant; The preparation method of modified epoxy resin is as follows: Step 1: maleic anhydride, polyethylene glycol monomethyl ether, p-toluenesulfonic acid, hydroquinone and toluene are uniformly mixed in a mass ratio of 1:9:0.04:0.03:8, reacted at 118°C for 6 hours, toluene and water were removed, and the mixture was distilled under reduced pressure to obtain a maleate compound; Step 2: Under nitrogen protection, reacting the amino-terminated fluorinated organosilicon and the maleate compound at 55° C. for 9 hours to obtain a hydrophobic modifier; the molar ratio of the amino-terminated fluorinated organosilicon to the maleate compound is 1:0.8; Step 3: Under nitrogen protection, 2 parts of polyester polyol, 14 parts of diphenylmethane diisocyanate and 0.04 parts of dibutyltin dilaurate were mixed evenly, reacted at 75°C for 2.5 hours, cooled to 45°C, 1.4 parts of hydrophobic modifier were added, and the reaction was continued for 1.5 hours to obtain a polyurethane prepolymer; Step 4: Stir 10 parts of epoxy resin at 45°C for 15 minutes, add 2 parts of polyurethane prepolymer under nitrogen protection, heat to 75°C, and keep the temperature for 5 hours to obtain modified epoxy resin; The preparation method of amino-terminated fluorinated silicone is as follows: Under nitrogen protection, 1.5 parts of 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane, 0.3 parts of ethylenediamine and 0.12 parts of water were mixed evenly, reacted at 65°C for 9 hours, heated to 100°C, and vacuumed to remove moisture and ethylenediamine, and 3 parts of 3-(2-aminoethylamino)propyltrimethoxysilane were added dropwise, and the mixture was added after 35 minutes. The mixture was reacted at 65°C for 4 hours, heated to 115°C, and vacuumed to obtain amino-terminated fluorinated silicone.

[0031] Example 3: A method for preparing ceramsite sand fracturing proppant using asbestos ore as raw material, comprising the following process: Step S1: grinding 35 parts of asbestos ore, 50 parts of bauxite, 20 parts of solid waste ceramsite sand, 3 parts of sintering aid, 25 parts of potassium feldspar, 8 parts of dolomite, 12 parts of kaolin, 2 parts of titanium oxide, and 1.5 parts of manganese powder, and passing the mixture through a 325-mesh sieve to obtain a mixture; granulating the mixture to obtain raw material particles; the sintering aid is composed of silica fume and magnesia clay in a mass ratio of 1:2; Step S2: drying, sintering (sintering temperature is 1300°C, sintering time is 5 hours), and cooling the raw material particles to obtain core particles; Step S3: preheating 100 parts of the core particles to 150°C, adding 15 parts of a modified epoxy resin, stirring evenly, then adding 3 parts of a curing agent, stirring evenly, and drying and curing (first drying at 100°C for 3 hours, then drying at 130°C for 5 hours) to form an outer coating to obtain a ceramsite sand fracturing proppant; The preparation method of modified epoxy resin is as follows: Step 1: maleic anhydride, polyethylene glycol monomethyl ether, p-toluenesulfonic acid, hydroquinone and toluene are uniformly mixed in a mass ratio of 1:10:0.05:0.04:10, reacted at 120°C for 7 hours, toluene and water were removed, and the mixture was distilled under reduced pressure to obtain a maleate compound; Step 2: Under nitrogen protection, reacting the amino-terminated fluorinated organosilicon and the maleate compound at 60° C. for 10 hours to obtain a hydrophobic modifier; the molar ratio of the amino-terminated fluorinated organosilicon to the maleate compound is 1:1; Step 3: Under nitrogen protection, 5 parts of polyester polyol, 40 parts of diphenylmethane diisocyanate and 0.15 parts of dibutyltin dilaurate were mixed evenly, reacted at 80°C for 3 hours, cooled to 50°C, 6.4 parts of hydrophobic modifier were added, and the reaction was continued for 2 hours to obtain a polyurethane prepolymer; Step 4: Stir 15 parts of epoxy resin at 50°C for 20 minutes, add 4.5 parts of polyurethane prepolymer under nitrogen protection, heat to 80°C, and keep the temperature for 6 hours to obtain modified epoxy resin; The preparation method of amino-terminated fluorinated silicone is as follows: Under nitrogen protection, 7 parts of 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane, 2.1 parts of ethylenediamine and 0.7 parts of water were mixed evenly, reacted at 70°C for 10 hours, heated to 100°C, and vacuumed to remove moisture and ethylenediamine, and 21 parts of 3-(2-aminoethylamino)propyltrimethoxysilane were added dropwise for 40 minutes. The mixture was reacted at 70°C for 5 hours, heated to 120°C, and vacuumed to obtain amino-terminated fluorinated silicone.

[0032] Comparative Example 1: Based on Example 2, no hydrophobic modifier was introduced in Comparative Example 1, and the remaining process steps and reaction parameters were consistent with Example 2; The preparation method of modified epoxy resin is as follows: Step 1: Under nitrogen protection, 2 parts of polyester polyol, 14 parts of diphenylmethane diisocyanate and 0.04 parts of dibutyltin dilaurate were mixed evenly and reacted at 75°C for 2.5 hours to obtain a polyurethane prepolymer; Step 4: Stir 10 parts of epoxy resin at 45°C for 15 minutes, add 2 parts of polyurethane prepolymer under nitrogen protection, heat to 75°C, and keep the temperature for reaction for 5 hours to obtain modified epoxy resin.

[0033] Comparative Example 2: Based on Example 2, only 10 parts of asbestos ore were added in Comparative Example 2, and the other steps were the same as those in Example 2.

[0034] Comparative Example 3: Based on Example 2, Comparative Example 3 replaced the hydrophobic modifier with an amino-terminated fluorinated organosilicon of the same mass, and did not introduce the maleate compound. The other steps were the same as in Example 2; The preparation method of modified epoxy resin is as follows: Step 1: Under nitrogen protection, 2 parts of polyester polyol, 14 parts of diphenylmethane diisocyanate and 0.04 parts of dibutyltin dilaurate were mixed evenly, reacted at 75°C for 2.5 hours, cooled to 45°C, and 1.4 parts of amino-terminated fluorinated silicone were added. The reaction was continued for 1.5 hours to obtain a polyurethane prepolymer; Step 2: Stir 10 parts of epoxy resin at 45°C for 15 minutes, add 2 parts of polyurethane prepolymer under nitrogen protection, heat to 75°C, and keep the temperature for reaction for 5 hours to obtain modified epoxy resin.

[0035] Comparative Example 4: Based on Example 2, the polyurethane prepolymer was not introduced in Comparative Example 4. The polyurethane prepolymer was replaced with amino-terminated fluorinated silicone of the same mass. The other steps were the same as in Example 2. The preparation method of modified epoxy resin is as follows: 10 parts of epoxy resin were stirred at 45°C for 15 minutes, and 2 parts of amino-terminated fluorinated silicone were added under nitrogen protection. The temperature was raised to 75°C and the reaction was kept at this temperature for 5 hours to obtain a modified epoxy resin.

[0036] Experiment: The ceramsite sand fracturing proppants obtained in Examples 1-3 and Comparative Examples 1-4 were used to prepare samples, and their properties were tested and the test results were recorded: Crushing rate test: refer to Q / SY 17125-2019 "Performance Indicators and Evaluation Test Methods of Fracturing Fluid Proppants", with a closing pressure of 86 MPa.

[0037] Conductivity test: refer to SY / T 6302-2019 "Test method for conductivity of fracturing proppant".

[0038] Adsorption performance test: A fracturing fluid was prepared according to the formula disclosed in Chinese patent document CN117887441B. The proppants prepared in Examples 1-3 and Comparative Examples 1-4 were immersed in the fracturing fluid for 48 hours. The proppants were weighed before and after immersion, and the weight gain rate of the proppants was calculated.

[0039] The test results are shown in Table 1.

[0040] Table 1 Performance test results of ceramsite sand fracturing proppant

[0041] According to the data in the above table, we can clearly draw the following conclusions: In combination with Examples 1-3 and Comparative Examples 1-4, it can be seen that the ceramsite sand fracturing proppant prepared by the present invention exhibits excellent hydrophobic properties, low breakage rate and high conductivity; the weight gain rate of the proppant prepared in Comparative Example 1 is significantly increased, which shows that the introduction of a hydrophobic modifier can prevent the proppant from adsorbing fracturing fluid and crude oil; the breakage rate of the proppant prepared in Comparative Example 2 is significantly increased, which shows that reducing the amount of asbestos ore added will reduce the strength of the material; in Comparative Example 3, since no maleate compound is introduced, the various properties of the prepared proppant are reduced, indicating that the long PEG chain in the maleate compound can improve the dispersibility of the primary particles, and the pore distribution is more uniform after sintering, and the strength is higher; the breakage rate of the proppant prepared in Comparative Example 4 is increased, indicating that the present invention introduces a polyurethane prepolymer, which synergistically improves the toughness and impact resistance of the epoxy resin with the fluorine-containing chain segment in the hydrophobic modifier.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A method for preparing ceramsite sand fracturing proppant using asbestos ore as raw material, characterized by: The invention comprises inner core particles and an outer coating, wherein the inner core particles comprise the following components by weight: 25-35 parts of asbestos ore, 40-50 parts of bauxite, 10-20 parts of solid waste ceramsite sand, 1-3 parts of sintering aid, 15-25 parts of potassium feldspar, 3-8 parts of dolomite, 8-12 parts of kaolin, 1-2 parts of titanium oxide, and 0.5-1.5 parts of manganese powder; and the outer coating is a modified epoxy resin.

2. The method of preparing ceramsite sand fracturing proppant using asbestos ore as raw material according to claim 1, characterized in that: The sintering aid is composed of silica fume and magnesia clay in a mass ratio of 1: (1-2).

3. The method of preparing ceramsite sand fracturing proppant using asbestos ore as raw material according to claim 1, characterized in that: The preparation method of the modified epoxy resin is as follows: Step 1: maleic anhydride, polyethylene glycol monomethyl ether, p-toluenesulfonic acid, hydroquinone and toluene are uniformly mixed, reacted at 115-120° C. for 5-7 hours, and distilled under reduced pressure to obtain a maleate compound; Step 2: Under nitrogen protection, reacting the amino-terminated fluorinated organosilicon and the maleate compound at 50-60° C. for 8-10 hours to obtain a hydrophobic modifier; Step 3: Under nitrogen protection, polyester polyol, diphenylmethane diisocyanate and dibutyltin dilaurate are mixed evenly, reacted at 70-80°C for 2-3 hours, cooled to 40-50°C, a hydrophobic modifier is added, and the reaction is continued for 1-2 hours to obtain a polyurethane prepolymer; Step 4: Stir the epoxy resin at 40-50°C for 10-20 minutes, add the polyurethane prepolymer under nitrogen protection, raise the temperature to 70-80°C, and keep the temperature to react for 4-6 hours to obtain the modified epoxy resin.

4. The method of preparing ceramsite sand fracturing proppant using asbestos ore as raw material according to claim 3, characterized in that: The mass ratio of maleic anhydride, polyethylene glycol monomethyl ether, p-toluenesulfonic acid, hydroquinone and toluene is 1: (8-10): (0.03-0.05): (0.02-0.04): (5-10).

5. The method of preparing ceramsite sand fracturing proppant using asbestos ore as raw material according to claim 3, characterized in that: The molar ratio of the amino-terminated fluorinated organic silicon to the maleate compound is 1:(0.5-1.0).

6. The method of preparing ceramsite sand fracturing proppant using asbestos ore as raw material according to claim 5, characterized in that: The preparation method of the amino-terminated fluorinated organosilicon is as follows: Under nitrogen protection, 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane, ethylenediamine and water are mixed evenly, reacted at 60-70°C for 8-10 hours, heated to 100°C, and vacuumed to remove moisture and ethylenediamine, 3-(2-aminoethylamino)propyltrimethoxysilane is added dropwise over 30-40 minutes, reacted at 60-70°C for 3-5 hours, heated to 110-120°C, and vacuumed to obtain amino-terminated fluorinated silicone.

7. A method for preparing ceramsite sand fracturing proppant using asbestos ore as raw material according to any one of claims 1 to 6, characterized in that: The steps include: Step S1: Grinding asbestos ore, bauxite, solid waste ceramsite sand, sintering aid, potassium feldspar, dolomite, kaolin, titanium oxide, and manganese powder, and sieving to obtain a mixture; granulating the mixture to obtain raw material particles; the mixture comprises the following components by weight: 25-35 parts of asbestos ore, 40-50 parts of bauxite, 10-20 parts of solid waste ceramsite sand, 1-3 parts of sintering aid, 15-25 parts of potassium feldspar, 3-8 parts of dolomite, 8-12 parts of kaolin, 1-2 parts of titanium oxide, and 0.5-1.5 parts of manganese powder; Step S2: drying, sintering, and cooling the raw material particles to obtain core particles; Step S3: preheating the core particles, adding modified epoxy resin, stirring evenly, then adding curing agent and stirring evenly, drying and curing to form an outer coating to obtain ceramsite sand fracturing proppant.

8. The method for preparing ceramsite sand fracturing proppant using asbestos ore as raw material according to claim 7, characterized in that: The mass ratio of the modified epoxy resin to the core particles is (5-15):

100.

9. The method for preparing ceramsite sand fracturing proppant using asbestos ore as raw material according to claim 7, characterized in that: The curing agent is one of aliphatic amine, aromatic amine and polyether amine, and the amount of the curing agent added is 10-20% of the mass of the modified epoxy resin.

10. The method for preparing ceramsite sand fracturing proppant using asbestos ore as raw material according to claim 7, characterized in that: The sintering temperature is 1200-1300° C., and the sintering time is 3-5 hours.

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