A co2-cured industrial solid waste-based slurry for mine filling

Abstract

This invention relates to the field of mine backfilling applications, specifically to a CO2-solidified industrial solid waste-based slurry for mine backfilling, comprising the following raw materials in parts by weight: 85-105 parts solidifying agent, 15-22 parts sludge, 3-5 parts construction waste particles, 5-10 parts amine-functionalized porous material, 1.2-2.4 parts municipal solid waste particles, 0.5-2.5 parts rheology modifier, 0.1-0.5 parts setting regulator, and 0.1-0.5 parts defoamer; the solidifying agent, by weight percentage, includes 25-35 parts ettringite, 2-12 parts yellow phosphorus slag, 3-8 parts phosphogypsum, 4-16 parts modified fly ash, 3-10 parts desulfurized gypsum, 2-5 parts steel slag, and 3-5 parts tailings. By optimizing the solid waste combination and activation process, the slurry can actively adsorb / mineralize CO2 during the backfilling and solidification process, achieving the dual goals of increasing the strength of the backfill and reducing carbon emissions.

Description

Technical Field

[0001] This invention relates to the field of mine filling application technology, and more specifically, to a CO2-solidified industrial solid waste-based slurry for mine filling. Background Technology

[0002] In the field of building materials, grouting materials are widely used in many scenarios such as infrastructure construction, tunnel engineering, and bridge reinforcement, playing a crucial role in filling pores, fixing components, and enhancing structural stability. Traditional grouting materials are mainly based on cement, with various chemical admixtures added to improve their performance. However, these materials have many problems. On the one hand, cement production is energy-intensive and produces large amounts of carbon emissions, which contradicts the current concept of green and sustainable development; on the other hand, their performance improvement potential is limited, making it difficult to meet the stringent requirements of some special projects for high strength, high fluidity, and durability.

[0003] With the rapid development of industry, the amount of industrial solid waste such as slag, fly ash, and steel slag is increasing dramatically. Most of this solid waste is simply dumped or landfilled, which not only occupies a large amount of land resources but also may cause environmental pollution such as soil and water pollution. How to effectively treat and reuse industrial solid waste has become an urgent problem to be solved. Against this backdrop, the development of a green grouting material based on industrial solid waste is particularly important. Applying it to the grouting field of lightweight building materials can not only realize the resource utilization of industrial solid waste, reduce dependence on natural resources, and reduce environmental pollution, but also leverage the characteristics of industrial solid waste itself to develop new building materials with better performance and lower costs, providing the construction industry with more environmentally friendly and efficient solutions and promoting the sustainable development of the entire industry.

[0004] In existing technologies, CO2-solidified industrial solid waste-based slurries offer the dual advantages of carbon reduction and waste resource utilization in mine backfilling. However, they still face challenges such as high viscosity or particle aggregation hindering the uniform distribution of CO2 within the slurry, resulting in localized "carbonization-deficient" zones. Inappropriate curing conditions, such as failure to cure at suitable temperature, pressure, or CO2 partial pressure, can also hinder the completion of the carbonization reaction, leading to insufficient strength and durability. Summary of the Invention

[0005] This invention provides a CO2-solidified industrial solid waste-based slurry for mine filling. By optimizing the solid waste combination and activation process, the slurry can actively adsorb / mineralize CO2 during the filling and solidification process, achieving the dual goals of improving the strength of the filling body and reducing carbon emissions.

[0006] In a first aspect, the present invention provides a CO2-solidified industrial solid waste-based slurry for mine backfilling, comprising the following raw materials in parts by weight: 85-105 parts of solidifying agent, 15-22 parts of sludge, 3-5 parts of construction waste particles, 5-10 parts of amine-functionalized porous material, 1.2-2.4 parts of municipal solid waste particles, 0.5-2.5 parts of rheology modifier, 0.1-0.5 parts of setting regulator, and 0.1-0.5 parts of defoamer; The curing agent comprises the following components by weight: 25-35 parts ettringite, 2-12 parts yellow phosphorus slag, 3-8 parts phosphogypsum, 4-16 parts modified fly ash, 3-10 parts desulfurized gypsum, 2-5 parts steel slag, and 3-5 parts tailings.

[0007] Preferably, the amine-functionalized porous material is a melamine porous material modified with Prussian blue, carbon nanotubes and chitosan, using melamine porous sponge as the framework.

[0008] Preferably, (1) the melamine sponge is pretreated (e.g., acid washing or alkali washing) to optimize the surface active sites. Since the melamine sponge itself contains abundant amino groups, the degree of amine functionalization can be enhanced through further chemical modification (e.g., Schiff base reaction), and crosslinking agents can be introduced to improve mechanical stability; (2) the carbon nanotubes are amine functionalized by oxidation and then reacted with ethylenediamine. Subsequently, the amine-functionalized carbon nanotubes are uniformly loaded into the melamine sponge skeleton by methods such as impregnation, vacuum-assisted infiltration or in-situ growth. This not only enhances the conductivity of the composite material, but also provides more anchoring points for the introduction of Prussian blue and chitosan. (3) the chitosan solution is impregnated into the melamine sponge loaded with carbon nanotubes, and the chitosan is fixed on the sponge skeleton by a crosslinking reaction (e.g., using glutaraldehyde or epichlorohydrin as a crosslinking agent) to form a stable composite material. The introduction of chitosan can enhance the biocompatibility and adsorption performance of the material, and may provide additional amine groups. (4) Based on the chitosan-carbon nanotube-melamine composite material, Prussian blue nanoparticles are introduced by electrochemical deposition or in-situ precipitation. The introduction of Prussian blue usually requires precise control of pH and ion concentration. This will form an electrochemically active Prussian blue layer on or inside the composite material.

[0009] Preferably, the mass ratio of the melamine porous sponge, Prussian blue, carbon nanotubes and chitosan is 3~11:2~3:1~2:1.

[0010] Preferably, the modified fly ash is prepared by uniformly mixing fly ash with calcium oxide, ore-inducing agent, and calcium sulfate dihydrate.

[0011] Preferably, the ore-initiating agent is selected from at least one of ammonium dibutyl dithiophosphate, flavonoids, dithiophosphates, fatty acids, and amines.

[0012] Preferably, the mass ratio of fly ash, calcium oxide, ore-inducing agent and calcium sulfate dihydrate is 5~14:1~2:1~3:1.

[0013] Preferably, the rheology modifier is selected from at least one of polycarboxylate superplasticizer, polyacrylamide, xanthan gum, vinyl gum, cellulose ether, triterpenoid saponin, and sodium rosinate.

[0014] Preferably, the setting regulator is selected from at least one of lignin sulfonate, PCE, triethanolamine, and organic amine.

[0015] Preferably, the defoamer is selected from at least one of sodium dodecyl sulfate combined with fatty alcohol, polyether-modified organosilicon, and modified polydimethylsiloxane.

[0016] Preferably, the construction waste particles include concrete slurry waste, crushed stone waste, shield tunnel waste mud / sludge, tailings and coal gangue.

[0017] Municipal solid waste pellets include waste newspapers and cardboard, waste glass, concrete fragments, mining solid waste, and construction waste (such as waste perlite pellets) as aggregates.

[0018] Preferably, the solid waste from the mine includes coal gangue, fly ash, yellow phosphorus slag, slag, stainless steel slag, and red mud.

[0019] Secondly, the present invention provides a CO2-cured industrial solid waste-based slurry for use in mine backfilling.

[0020] In summary, the present invention has the following beneficial effects: 1. This invention uses amine-functionalized melamine porous sponge as a framework, loaded with Prussian blue, carbon nanotubes, and chitosan respectively. This significantly improves the mine filling performance of CO2-cured industrial solid waste-based slurry in four key aspects: flowability, CO2 curing rate, mechanical strength, durability, and secondary pollution control, achieving efficient, low-carbon, and long-term safe mine filling. The advantages of melamine sponge itself include abundant amino and hydroxyl functional groups, facilitating subsequent chemical modification (such as amine functionalization). It is lightweight, flame-retardant, and high-temperature resistant, maintaining structural stability under high-pressure mine environments. It also possesses good mechanical strength, supporting the framework during slurry flow and preventing sedimentation or collapse. The advantages of Prussian blue (PB) modification include the formation of a highly hydrophilic layer on the sponge surface. This layer's efficient photothermal conversion can increase local temperature under light or waste heat conditions, accelerating the mineralization reaction of CO2 and slag, and improving the CO2 curing rate. Its strong hydrophilicity improves slurry dispersibility, reduces viscosity, and makes the slurry easier to inject into complex goaf pores. The advantages of carbon nanotube (CNT) composites are as follows: CNTs form a composite film / skeleton with melamine sponge, significantly improving the material's electrical and thermal conductivity, facilitating uniform heat transfer, and further promoting CO2 mineralization kinetics. The high specific surface area and mechanical toughness of CNTs enhance the sponge's compressive strength and crack resistance, making the cured filler more pressure-resistant and impact-resistant. Chitosan, rich in amino and hydroxyl groups, forms multiple chemisorption sites on the sponge surface, significantly improving its ability to capture metal and radioactive ions. The biodegradability and hydrophilicity of chitosan improve the fluidity and dispersibility of the slurry, reducing injection resistance. The synergistic effect with melamine sponge forms a composite skeleton, providing a crack-resistant and impermeable microstructure after curing, which helps in the long-term sequestration of CO2 and solid waste, preventing leakage.

[0021] 2. The modified fly ash in this invention is prepared by uniformly mixing fly ash with calcium oxide, a mineral initiator, and calcium sulfate dihydrate. The introduction of calcium oxide and calcium sulfate dihydrate provides additional calcium. 2+ The modified fly ash further accelerates carbonate precipitation and improves mineralization conversion rate. It shortens the hydration induction period, reduces early exothermic reactions, promotes the nucleation and densification of calcium silicate (CSH) gel in cement hydration, decreases slurry porosity and macropore content, and relatively increases compressive strength. The addition of calcium sulfate dihydrate and appropriate amounts of calcium oxide reduces slurry viscosity and enhances fluidity, facilitating long-distance underground transport and continuous grouting, and reducing the risk of pipe blockage. The modified fly ash has a looser microstructure and richer pores, enhancing its CO2 adsorption capacity and further accelerating the mineralization reaction. The addition of modified fly ash not only improves CO2 solidification efficiency and the mechanical properties of the filling material but also significantly improves slurry fluidity, reduces costs, and achieves the dual environmental benefits of resource utilization of industrial waste and carbon emission reduction, making it a key advantage of mine filling technology.

[0022] 3. The CO2-solidified industrial solid waste-based slurry for mine filling prepared by the present invention, through optimization of solid waste combination and activation process, enables the slurry to actively adsorb / mineralize CO2 during the filling and solidification process, thereby achieving the dual goals of improving the strength of the filling body and reducing carbon emissions.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the scope of protection of the present invention. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the embodiments. It should be noted that: unless otherwise specified, the conditions in the following embodiments are carried out according to conventional conditions or the conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following embodiments can be obtained from commercially available sources.

[0025] Example Example 1 A CO2-cured industrial solid waste-based slurry for mine filling comprises the following raw materials in parts by weight: 85 parts curing agent, 15 parts sludge, 3 parts construction waste particles, 5 parts amine-functionalized porous material, 1.2 parts municipal solid waste particles, 0.5 parts rheology modifier, 0.1 parts setting agent, and 0.1 parts defoamer. The curing agent, by weight percentage, includes 25 parts ettringite, 2 parts yellow phosphorus slag, 3 parts phosphogypsum, 4 parts modified fly ash, 3 parts desulfurized gypsum, 2 parts steel slag, and 3 parts tailings.

[0026] Amine-functionalized porous materials are melamine porous sponges with Prussian blue, carbon nanotubes and chitosan as the framework. The mass ratio of melamine porous sponge, Prussian blue, carbon nanotubes and chitosan is 3:2:1:1.

[0027] Modified fly ash is prepared by uniformly mixing fly ash with calcium oxide, ore-inducing agent, and calcium sulfate dihydrate; the ore-inducing agent is selected from ammonium dibutyl dithiophosphate, and the mass ratio of fly ash, calcium oxide, ore-inducing agent and calcium sulfate dihydrate is 5:1:1:1.

[0028] The rheology modifier is selected from polycarboxylate superplasticizers; the setting regulator is selected from lignosulfonate; and the defoamer is selected from sodium dodecyl sulfate combined with fatty alcohol. Construction waste particles are concrete slurry waste, and municipal solid waste particles are coal gangue, a type of mining solid waste.

[0029] A method for preparing a CO2-solidified industrial solid waste-based slurry for mine backfilling includes the following steps: S1. Pretreatment: The CO2-solidified industrial solid waste base material used for mine backfilling is dried, crushed, and then ground to a specific surface area of ​​500 m². 2 / kg; S2. Mixing: Dry mix the pretreated industrial solid waste-based cementitious material with the active activator, dispersant, retarder, and stabilizer according to the specified ratio for 5 minutes to obtain a mixed dry material; S3. Pulping: Add water to the mixed dry materials and mix at a stirring speed of 800 r / min for 5 min to obtain the final product.

[0030] Example 2 A CO2-cured industrial solid waste-based slurry for mine backfilling comprises the following raw materials in parts by weight: 95 parts curing agent, 18 parts sludge, 3 parts construction waste particles, 5 parts amine-functionalized porous material, 1.5 parts municipal solid waste particles, 0.5 parts rheology modifier, 0.2 parts setting regulator, and 0.1 parts defoamer. The curing agent, by weight percentage, includes 28 parts ettringite, 4 parts yellow phosphorus slag, 4 parts phosphogypsum, 5 parts modified fly ash, 4 parts desulfurized gypsum, 4 parts steel slag, and 4 parts tailings.

[0031] Amine-functionalized porous materials are melamine porous sponges with Prussian blue, carbon nanotubes and chitosan as the framework. The mass ratio of melamine porous sponge, Prussian blue, carbon nanotubes and chitosan is 5:2:1:1.

[0032] Modified fly ash is prepared by uniformly mixing fly ash with calcium oxide, ore-inducing agent, and calcium sulfate dihydrate; the ore-inducing agent is selected from ammonium dibutyl dithiophosphate, and the mass ratio of fly ash, calcium oxide, ore-inducing agent and calcium sulfate dihydrate is 7:1:1:1.

[0033] The rheology modifier is selected from polycarboxylate superplasticizers; the setting regulator is selected from lignosulfonate; and the defoamer is selected from sodium dodecyl sulfate combined with fatty alcohol. Construction waste particles are concrete slurry waste, and municipal solid waste particles are coal gangue, a type of mining solid waste.

[0034] A method for preparing a CO2-solidified industrial solid waste-based slurry for mine backfilling includes the following steps: S1. Pretreatment: The CO2-solidified industrial solid waste base material used for mine backfilling is dried, crushed, and then ground to a specific surface area of ​​500 m². 2 / kg; S2. Mixing: Dry mix the pretreated industrial solid waste-based cementitious material with the active activator, dispersant, retarder, and stabilizer according to the specified ratio for 10 min to obtain a mixed dry material; S3. Pulping: Add water to the mixed dry materials and mix at a stirring speed of 1000 r / min for 10 min to obtain the final product.

[0035] Example 3 A CO2-cured industrial solid waste-based slurry for mine filling comprises the following raw materials in parts by weight: 100 parts curing agent, 18 parts sludge, 4 parts construction waste particles, 7 parts amine-functionalized porous material, 1.8 parts municipal solid waste particles, 1.2 parts rheology modifier, 0.2 parts setting regulator, and 0.3 parts defoamer. The curing agent, by weight percentage, includes 30 parts ettringite, 7 parts yellow phosphorus slag, 4 parts phosphogypsum, 8 parts modified fly ash, 5 parts desulfurized gypsum, 3 parts steel slag, and 3 parts tailings.

[0036] Amine-functionalized porous materials are melamine porous sponges with Prussian blue, carbon nanotubes and chitosan as the framework. The mass ratio of melamine porous sponge, Prussian blue, carbon nanotubes and chitosan is 5:2:1:1.

[0037] Modified fly ash is prepared by uniformly mixing fly ash with calcium oxide, ore-inducing agent, and calcium sulfate dihydrate; the ore-inducing agent is selected from ammonium dibutyl dithiophosphate, and the mass ratio of fly ash, calcium oxide, ore-inducing agent and calcium sulfate dihydrate is 10:1:1:1.

[0038] The rheology modifier is selected from polycarboxylate superplasticizers; the setting regulator is selected from lignosulfonate; and the defoamer is selected from sodium dodecyl sulfate combined with fatty alcohol. Construction waste particles are concrete slurry waste, and municipal solid waste particles are coal gangue, a type of mining solid waste.

[0039] A method for preparing a CO2-solidified industrial solid waste-based slurry for mine backfilling includes the following steps: S1. Pretreatment: The CO2-solidified industrial solid waste base material used for mine backfilling is dried, crushed, and then ground to a specific surface area of ​​500 m². 2 / kg; S2. Mixing: Dry mix the pretreated industrial solid waste-based cementitious material with the active activator, dispersant, retarder, and stabilizer according to the specified ratio for 10 min to obtain a mixed dry material; S3. Pulping: Add water to the mixed dry materials and mix at a stirring speed of 1200 r / min for 15 min to obtain the final product.

[0040] Example 4 A CO2-cured industrial solid waste-based slurry for mine filling comprises the following raw materials in parts by weight: 102 parts curing agent, 20 parts sludge, 4 parts construction waste particles, 8 parts amine-functionalized porous material, 2.1 parts municipal solid waste particles, 2.2 parts rheology modifier, 0.4 parts setting regulator, and 0.4 parts defoamer. The curing agent, by weight percentage, includes 32 parts ettringite, 10 parts yellow phosphorus slag, 7 parts phosphogypsum, 15 parts modified fly ash, 8 parts desulfurized gypsum, 4 parts steel slag, and 4 parts tailings.

[0041] Amine-functionalized porous materials are melamine porous materials modified with Prussian blue, carbon nanotubes and chitosan, using melamine porous sponge as the framework; the mass ratio of melamine porous sponge, Prussian blue, carbon nanotubes and chitosan is 10:3:2:1.

[0042] Modified fly ash is prepared by uniformly mixing fly ash with calcium oxide, ore-inducing agent, and calcium sulfate dihydrate; the ore-inducing agent is selected from ammonium dibutyl dithiophosphate, and the mass ratio of fly ash, calcium oxide, ore-inducing agent and calcium sulfate dihydrate is 13:2:3:1.

[0043] The rheology modifier is selected from polycarboxylate superplasticizers; the setting regulator is selected from lignosulfonate; and the defoamer is selected from sodium dodecyl sulfate combined with fatty alcohol. Construction waste particles are concrete slurry waste, and municipal solid waste particles are coal gangue, a type of mining solid waste.

[0044] A method for preparing a CO2-solidified industrial solid waste-based slurry for mine backfilling includes the following steps: S1. Pretreatment: The CO2-solidified industrial solid waste base material used for mine backfilling is dried, crushed, and then ground to a specific surface area of ​​500 m². 2 / kg; S2. Mixing: Dry mix the pretreated industrial solid waste-based cementitious material with the active activator, dispersant, retarder, and stabilizer according to the specified ratio for 10 min to obtain a mixed dry material; S3. Pulping: Add water to the mixed dry materials and mix at a stirring speed of 1200 r / min for 15 min to obtain the final product.

[0045] Example 5 A CO2-cured industrial solid waste slurry for mine filling comprises the following raw materials in parts by weight: 105 parts curing agent, 22 parts sludge, 5 parts construction waste particles, 10 parts amine-functionalized porous material, 2.4 parts municipal solid waste particles, 2.5 parts rheology modifier, 0.5 parts setting regulator, and 0.5 parts defoamer. The curing agent, by weight percentage, includes 35 parts ettringite, 12 parts yellow phosphorus slag, 8 parts phosphogypsum, 16 parts modified fly ash, 10 parts desulfurized gypsum, 5 parts steel slag, and 5 parts tailings.

[0046] Amine-functionalized porous materials are melamine porous sponges with Prussian blue, carbon nanotubes and chitosan as the framework. The mass ratio of melamine porous sponge, Prussian blue, carbon nanotubes and chitosan is 11:3:2:1.

[0047] Modified fly ash is prepared by uniformly mixing fly ash with calcium oxide, ore-inducing agent, and calcium sulfate dihydrate; the ore-inducing agent is selected from ammonium dibutyl dithiophosphate, and the mass ratio of fly ash, calcium oxide, ore-inducing agent and calcium sulfate dihydrate is 14:2:3:1.

[0048] The rheology modifier is selected from polycarboxylate superplasticizers; the setting regulator is selected from lignosulfonate; and the defoamer is selected from sodium dodecyl sulfate combined with fatty alcohol. Construction waste particles are concrete slurry waste, and municipal solid waste particles are coal gangue, a type of mining solid waste.

[0049] A method for preparing a CO2-solidified industrial solid waste-based slurry for mine backfilling includes the following steps: S1. Pretreatment: The CO2-solidified industrial solid waste base material used for mine backfilling is dried, crushed, and then ground to a specific surface area of ​​500 m². 2 / kg; S2. Mixing: Dry mix the pretreated industrial solid waste-based cementitious material with the active activator, dispersant, retarder, and stabilizer according to the specified ratio for 10 min to obtain a mixed dry material; S3. Pulping: Add water to the mixed dry materials and mix at a stirring speed of 1200 r / min for 15 min to obtain the final product.

[0050] Comparative Example 1 Same as Example 1, except that the modified fly ash in the curing agent was not added.

[0051] Comparative Example 2 Same as Example 1, except that no rheology modifier was added.

[0052] Comparative Example 3 Same as Example 1, except that no amine-functionalized porous material was added. Table 1 Performance Test Results ; As shown in Table 1, the CO2-solidified industrial solid waste-based slurry for mine filling prepared by the present invention, through optimization of solid waste combination and activation process, enables the slurry to actively adsorb / mineralize CO2 during the filling and solidification process, thereby achieving the dual goals of improving the strength of the filling body and reducing carbon emissions.

[0053] The above description is merely an exemplary embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A CO2-solidified industrial solid waste-based slurry for mine backfilling, characterized in that, The raw materials contain the following parts by weight: 85-105 parts of curing agent, 15-22 parts of sludge, 3-5 parts of construction waste granules, 5-10 parts of amine-functionalized porous material, 1.2-2.4 parts of municipal solid waste granules, 0.5-2.5 parts of rheology modifier, 0.1-0.5 parts of setting regulator, and 0.1-0.5 parts of defoamer; The curing agent comprises the following components by weight: 25-35 parts ettringite, 2-12 parts yellow phosphorus slag, 3-8 parts phosphogypsum, 4-16 parts modified fly ash, 3-10 parts desulfurized gypsum, 2-5 parts steel slag, and 3-5 parts tailings.

2. The CO2-solidified industrial solid waste slurry for mine backfilling according to claim 1, characterized in that, The amine-functionalized porous material is a melamine porous material modified with Prussian blue, carbon nanotubes and chitosan, using melamine porous sponge as the framework.

3. The CO2-solidified industrial solid waste-based slurry for mine backfilling according to claim 1, characterized in that, The mass ratio of the melamine porous sponge, Prussian blue, carbon nanotubes and chitosan is 3~11:2~3:1~2:

1.

4. The CO2-solidified industrial solid waste slurry for mine backfilling according to claim 1, characterized in that, The modified fly ash is prepared by uniformly mixing fly ash with calcium oxide, ore-inducing agent, and calcium sulfate dihydrate.

5. The CO2-solidified industrial solid waste slurry for mine backfilling according to claim 4, characterized in that, The ore-attracting agent is selected from at least one of ammonium dibutyl dithiophosphate, flavonoids, dithiophosphates, fatty acids, and amines.

6. The CO2-solidified industrial solid waste-based slurry for mine backfilling according to claim 4, characterized in that, The mass ratio of fly ash, calcium oxide, ore-inducing agent and calcium sulfate dihydrate is 5~14:1~2:1~3:

1.

7. The CO2-solidified industrial solid waste slurry for mine backfilling according to claim 1, characterized in that, The rheology modifier is selected from at least one of polycarboxylate superplasticizer, polyacrylamide, xanthan gum, vinyl gum, cellulose ether, triterpenoid saponin, and sodium rosinate.

8. The CO2-solidified industrial solid waste slurry for mine backfilling according to claim 1, characterized in that, The setting regulator is selected from at least one of lignin sulfonate, PCE, triethanolamine, and organic amine.

9. The CO2-solidified industrial solid waste-based slurry for mine backfilling according to claim 1, characterized in that, The defoamer is selected from at least one of sodium dodecyl sulfate combined with fatty alcohol, polyether-modified organosilicon, and modified polydimethylsiloxane.

10. An application of the CO2-solidified industrial solid waste-based slurry for mine backfilling as described in any one of claims 1 to 9, characterized in that, The CO2-cured industrial solid waste slurry is used for mine backfilling.