Tailings filling cementitious material for improving the compressive strength of fine-grained paste tailings consolidation body and its application

Abstract

The present application relates to the field of tailings filling, and specifically discloses a tailings filling cementitious material for improving the compressive strength of fine-grained tailings paste consolidation. The tailings filling cementitious material comprises the following raw materials in parts by weight: 50-70 parts blast furnace slag, 15-25 parts cement, 15-25 parts gypsum, and 17-22 parts of a promoting component, wherein the promoting component comprises a promoter, a compensating agent, and a connecting agent, and the weight ratio of the promoter, compensating agent, and connecting agent is 3-6:2-4:12. The tailings filling cementitious material of the present application can be used for fine-grained tailings filling, and has the advantage of promoting early strength development.

Description

Technical Field

[0001] The present application relates to the field of tailings filling, and more specifically, to a tailings filling gelling material for improving the compressive strength of a fine-grained paste tailings consolidation body and its use. Background Art

[0002] For mining enterprises that integrate mining and selection, the technical route adopts "coarse-grained sand making-fine-grained filling". Through comprehensive technical means such as coarse-grained tailings classification recovery and fine-grained tailings paste concentration, the tailing-free emission of low-grade iron mines is successfully achieved.

[0003] Regarding the traditional mining coarse-grained tailings filling process, the particle size of the filling tailings has changed significantly because it has been changed to fine-grained paste tailings filling. The traditional coarse-grained tailings filling cementitious materials cannot achieve effective cementation of the fine-grained tailings, resulting in slow development of the early strength of the fine-grained paste tailings consolidation body. Summary of the Invention

[0004] In order to achieve effective intersection of fine-grained tailings and improve the early strength development speed of fine-grained paste tailings consolidation body, the present application provides a tailings filling cementitious material and its use for improving the compressive strength of fine-grained paste tailings consolidation body.

[0005] First aspect:

[0006] The present application provides a tailings filling gelling material for improving the compressive strength of fine-grained tailings paste consolidation, which adopts the following technical solutions:

[0007] A tailings filling cementitious material for improving the compressive strength of a fine-grained paste tailings consolidation body comprises the following raw materials in parts by weight: 50-70 parts of blast furnace slag, 15-25 parts of cement, 15-25 parts of gypsum, and 17-22 parts of a promoting component, wherein the promoting component comprises a promoter, a compensating agent, and a connecting agent, and the weight ratio of the promoter, the compensating agent, and the connecting agent is 3-6:2-4:12.

[0008] By adopting the above technical solution, the accelerator and the compensator are first added to the cementitious material using the connecting agent as a carrier. After mixing, the accelerator promotes the hydration of the cementitious material, thereby accelerating the development of early strength, and the compensator compensates for the hydration shrinkage of the cementitious material, thereby improving the overall structural stability while increasing the early strength.

[0009] Preferably, the accelerator comprises calcium chloride and aluminum chloride, and the weight ratio of the calcium chloride to the aluminum chloride is 2:1.

[0010] By adopting the above technical solution, calcium chloride and aluminum chloride are used to provide chloride ions to promote the conversion of C3A into hydrated calcium chloroaluminate during the hydration process of the gel material, thereby accelerating the early strength development of the gel material, effectively improving the early strength of the gel material, and further effectively improving the tailings filling solidification efficiency.

[0011] Preferably, the compensating agent comprises alunite and anhydrous calcium sulfoaluminate, and the weight ratio of the alunite to the anhydrous calcium sulfoaluminate is 1:1.

[0012] By adopting the above technical solution, when alunite and anhydrous calcium sulfoaluminate are used as compensating agents, the early strength of the cementitious material develops rapidly during the hydration process because C3A is affected by the chloride ions provided by calcium chloride and aluminum chloride to generate a large amount of hydrated calcium chloroaluminate, but the cementitious material shrinks. Alum and anhydrous calcium sulfoaluminate combine with calcium hydroxide in the hydration process to generate hydrated calcium sulfoaluminate, which not only improves the tensile strength of the cementitious material but also compensates for the shrinkage of the cementitious material, thereby reducing the adverse effects of shrinkage.

[0013] Preferably, the connecting agent includes a support, an adhesive resin and a protective fiber, and the weight ratio of the support, the adhesive resin and the protective fiber is 4:1:1.

[0014] By adopting the above technical solution, the carrier acts as a load for the accelerator and the compensator, the adhesive resin enhances the connection strength of the accelerator and the compensator on the carrier, and the protective fiber is located in the outer layer to protect the accelerator and the compensator, so that the accelerator and the compensator can be in adjacent positions and play a role during the mixing process, which is beneficial to promote the early strength development of the cementitious material while compensating for shrinkage and improving the overall stability.

[0015] Preferably, the support comprises phosphogypsum, modified corn starch and triethanolamine, and the weight ratio of the phosphogypsum, modified corn starch and triethanolamine is 10:1:1.

[0016] By adopting the above technical solution, phosphogypsum is affected by triethanolamine and modified corn starch to form loaded particles as a whole. In this case, the accelerator and compensator in the outer layer first promote the early strength development of the cementitious material, and then further promote the strength enhancement of the cementitious material through the action of phosphogypsum and triethanolamine.

[0017] Preferably, the support is prepared by the following steps: adding water to modified corn starch to prepare an adhesive, then mixing it with phosphogypsum and triethanolamine, granulating it through a disc, and drying it to obtain the support.

[0018] By adopting the above technical solution, modified corn starch is used as a binder, triethanolamine is used as a phosphogypsum modifier, and the prepared support body is used as the innermost particle component to load the accelerator and the compensator, so that the accelerator and the compensator are located in a close position, which is beneficial for the compensator to compensate for the shrinkage of the part affected by the accelerator. At the same time, the phosphogypsum participates in the hydration reaction while the accelerator and the compensator take effect, further promoting the development of the early strength of the cementitious material.

[0019] Preferably, the promoting component is prepared by the following steps: firstly, mixing the support body and the adhesive resin, adding the promoting agent and the compensating agent and continuing to stir, adding the protective fiber after stirring evenly, continuing to stir evenly and then drying to prepare the promoting component.

[0020] By adopting the above technical solution, the mixture of the promoter and the compensator is first loaded on the support body in a sequential loading order, and then the protective fiber is loaded thereon, thereby preparing a promoter component, wherein the protective fiber is located in the outermost layer to protect the promoter and the compensator. After mixing with the tailings, the protective fiber dissolves and detaches, thereby improving the filling strength.

[0021] Second aspect:

[0022] The present application provides a use of a tailings filling gelling material for improving the compressive strength of a fine-grained tailings paste consolidation body, using the following technical solution:

[0023] The invention discloses a tailings filling gelling material for improving the compressive strength of fine-grained paste tailings consolidation body. Fine-grained tailings and gelling material are mixed for filling. The concentration of fine-grained tailings is 53%, and the weight ratio of fine-grained tailings to gelling material is 13:1.

[0024] In summary, this application has the following beneficial effects:

[0025] 1. Since the present application uses a connector as a carrier to add a promoter and a compensator to the cementitious material, when the cementitious material is used for tailings filling, the cementitious material is first mixed with the tailings. In the process of forming early strength, the promoter promotes the hydration of the cementitious material and accelerates the development speed of the early strength of the cementitious material. In this process, the early strength of the cementitious material is formed rapidly. At this time, the cementitious material shrinks and the compensator compensates for the shrinkage, effectively reducing the adverse effects caused by shrinkage.

[0026] 2. In this application, calcium chloride and aluminum chloride are preferably used as accelerators. These two provide chloride ions to promote the conversion of C3A into hydrated calcium chloroaluminate during the hydration process of the gel material, thereby accelerating the early strength development of the gel material, effectively improving the early strength development speed of the gel material, and enabling the gel material to quickly reach a certain strength, thereby effectively improving the tailings filling and solidification efficiency.

[0027] 3. In the present application, alunite and anhydrous calcium sulfoaluminate are preferably used as compensating agents. During the hydration process of the cementitious material, C3A is affected by the chloride ions provided by calcium chloride and aluminum chloride to generate a large amount of hydrated calcium chloroaluminate, and the early strength develops rapidly. However, the cementitious material shrinks. Alum and anhydrous calcium sulfoaluminate combine with calcium hydroxide in the hydration process to generate hydrated calcium sulfoaluminate, which improves the tensile strength of the cementitious material while compensating for the shrinkage of the cementitious material, thereby reducing the adverse effects of shrinkage.

[0028] 4. In the present application, a carrier is preferably used to connect the promoter and the compensator. During the production process, phosphogypsum is formed as a whole into loaded particles under the influence of modified corn starch and triethanolamine. The carrier serves as the innermost particle component to load the promoter and the compensator. The adhesive resin enhances the connection strength of the promoter and the compensator on the carrier, while the protective fiber is located in the outer layer to protect the promoter and the compensator, so that the promoter and the compensator can be in adjacent positions during the mixing process and play a role, which is beneficial to promote the early strength development of the cementitious material while compensating for shrinkage and improving the overall stability. DETAILED DESCRIPTION

[0029] In this application: fine tailings is D 95 Iron tailings with a diameter of less than 40 μm; blast furnace slag is S95 grade blast furnace construction project slag, purchased from the market; cement is ordinary silicate 42.5R cement, purchased from the market; gypsum is desulfurized gypsum powder with a mesh number of 200 mesh, purchased from the market; calcium chloride has a mesh number of 200 mesh, purchased from the market; aluminum chloride has a mesh number of 200 mesh, purchased from the market; alum stone has a mesh number of 200 mesh, purchased from the market; anhydrous calcium sulfoaluminate has a mesh number of 200 mesh, purchased from the market; phosphogypsum is purchased from Guzhen Mineral Products Co., Ltd., Lujiang County, Anhui Province, which is calcined phosphogypsum powder with a mesh number of 200 mesh; modified corn starch is pre-gelatinized corn starch, purchased from the market; triethanolamine is an industrial-grade active ingredient of 85%, purchased from the market; the adhesive resin is a mixture of vinyl resin and styrene in a weight ratio of 2:3; the protective fiber is basalt fiber with a length of 1-3 mm.

[0030] The present application is further described in detail below with reference to the embodiments.

[0031] Preparation Example

[0032] Preparation Example 1-Support Preparation Example

[0033] This preparation example discloses a support, which is prepared by the following steps: mixing 1 kg of modified corn starch with water as a binder in a mixing ratio of 1:3, then mixing 10 kg of phosphogypsum, 1 kg of triethanolamine, and the binder and stirring them evenly, preparing load particles by disc granulation, drying at 100°C for 1 hour, and taking load particles with a particle size of 3 to 5 mm as the support.

[0034] Preparation Example 2 - Preparation Example of Promoting Component This preparation example discloses a promoting component, which is prepared by the following steps: 8 kg of the support prepared in Preparation Example 1 is mixed with 2 kg of adhesive resin, 2 kg of calcium chloride, 1 kg of aluminum chloride, 1 kg of alum stone and 1 kg of anhydrous calcium sulfoaluminate are added and stirred to mix evenly, and then 2 kg of protective fiber is added and stirred to mix evenly, and then spread evenly and allowed to cure to obtain the promoting component.

[0035] Preparation Example 3 - Preparation Example of Promoting Component

[0036] This preparation example discloses a promoting component, which is prepared by the following steps: 8 kg of the support prepared in Preparation Example 1 is mixed with 2 kg of adhesive resin, 3 kg of calcium chloride, 1.5 kg of aluminum chloride, 1.5 kg of alum stone and 1.5 kg of anhydrous calcium sulfoaluminate are added and continued to be stirred and mixed evenly, and then 2 kg of protective fiber is added and stirred and mixed evenly, and then the promoting component is prepared after being spread evenly and cured.

[0037] Preparation Example 4 - Preparation Example of Promoting Component

[0038] This preparation example discloses a promoting component, which is prepared by the following steps: 8 kg of the support prepared in Preparation Example 1 is mixed with 2 kg of adhesive resin, 4 kg of calcium chloride, 2 kg of aluminum chloride, 2 kg of alum stone and 2 kg of anhydrous calcium sulfoaluminate are added and stirred until uniformly mixed, and then 2 kg of protective fiber is added and stirred until uniformly mixed, and then the promoting component is prepared by spreading and curing.

[0039] Preparation Example 5-Preparation Example of Promoting Component

[0040] This preparation example discloses a promoting component, which is prepared by the following steps: 8 kg of the support prepared in Preparation Example 1 is mixed with 2 kg of adhesive resin, 3 kg of calcium chloride and 1.5 kg of aluminum chloride are added and stirred until uniformly mixed, and then 2 kg of protective fiber is added and stirred until uniformly mixed, and then the mixture is spread evenly and allowed to cure to obtain the promoting component.

[0041] Preparation Example 6-Preparation Example of Promoting Component

[0042] This preparation example discloses a promoting component, which is prepared by the following steps: 8 kg of the support prepared in Preparation Example 1 is mixed with 2 kg of adhesive resin, 1.5 kg of alum stone and 1.5 kg of anhydrous calcium sulfoaluminate are added and continued to be stirred and mixed evenly, and then 2 kg of protective fiber is added and stirred and mixed evenly, and then spread and dispersed, and allowed to cure to obtain the promoting component.

[0043] Preparation Example 7-Preparation Example of Promoting Component

[0044] This preparation example discloses a promoting component, which is prepared by the following steps: 8 kg of the support prepared in Preparation Example 1 is mixed with 2 kg of adhesive resin, and then 2 kg of protective fiber is added and stirred evenly, and then spread and dispersed, and allowed to cure to obtain the promoting component.

[0045] Preparation Example 8-Preparation Example of Promoting Component

[0046] This preparation example discloses a promoting component, which is prepared by the following steps: 8 kg of the support prepared in Preparation Example 1 is continued to be stirred and mixed evenly with 3 kg of calcium chloride, 1.5 kg of aluminum chloride, 1.5 kg of alum stone and 1.5 kg of anhydrous calcium sulfoaluminate, and then 2 kg of protective fiber is added and stirred and mixed evenly, and then spread and dispersed, and allowed to solidify to obtain the promoting component.

[0047] Preparation Example 9-Preparation Example of Promoting Component

[0048] This preparation example discloses a promoting component, which is prepared by the following steps: 8 kg of the support prepared in Preparation Example 1 is mixed with 2 kg of adhesive resin, 3 kg of calcium chloride, 1.5 kg of aluminum chloride, 1.5 kg of alum stone and 1.5 kg of anhydrous calcium sulfoaluminate are added, and the mixture is continued to be stirred evenly, and then spread evenly and allowed to solidify to obtain the promoting component.

[0049] Preparation Example 10-Preparation Example of Promoting Component

[0050] This preparation example discloses a promoting component, which is prepared by the following steps: 8 kg of the support prepared in Preparation Example 1 is stirred and mixed evenly with 3 kg of calcium chloride, 1.5 kg of aluminum chloride, 1.5 kg of alum stone and 1.5 kg of anhydrous calcium sulfoaluminate, and then spread and dispersed, and allowed to solidify to obtain the promoting component.

[0051] Example

[0052] Example 1

[0053] This embodiment discloses a tailings filling cementitious material, which is prepared by the following steps: 50 kg of blast furnace slag, 15 kg of cement, 15 kg of gypsum and 17 kg of the promoting component prepared in Preparation Example 2 are stirred and mixed to form the cementitious material.

[0054] Example 2

[0055] This embodiment discloses a tailings filling cementitious material, which is prepared by the following steps: 60 kg of blast furnace slag, 20 kg of cement, 20 kg of gypsum and 19 kg of the promoting component prepared in Preparation Example 3 are stirred and mixed to form the cementitious material.

[0056] Example 3

[0057] This embodiment discloses a tailings filling cementitious material, which is prepared by the following steps: 70 kg of blast furnace slag, 25 kg of cement, 25 kg of gypsum and 22 kg of the promoting component prepared in Preparation Example 4 are stirred and mixed to form the cementitious material.

[0058] Example 4

[0059] This embodiment discloses a tailings filling cementitious material, which is prepared by the following steps: 60 kg of blast furnace slag, 20 kg of cement, 20 kg of gypsum and 19 kg of the promoting component prepared in Preparation Example 8 are stirred and mixed to form the cementitious material.

[0060] Example 5

[0061] This embodiment discloses a tailings filling cementitious material, which is prepared by the following steps: 60 kg of blast furnace slag, 20 kg of cement, 20 kg of gypsum and 19 kg of the promoting component prepared in Preparation Example 9 are stirred and mixed to form the cementitious material.

[0062] Example 6

[0063] This embodiment discloses a tailings filling cementitious material, which is prepared by the following steps: 60 kg of blast furnace slag, 20 kg of cement, 20 kg of gypsum and 19 kg of the promoting component prepared in Preparation Example 10 are stirred and mixed to form the cementitious material.

[0064] Comparative Example

[0065] Comparative Example 1

[0066] This comparative example discloses a tailings filling cementitious material, which is prepared by the following steps: 60 kg of blast furnace slag, 20 kg of cement, 20 kg of gypsum and 19 kg of the promoting component prepared in Preparation Example 5 are stirred and mixed to form the cementitious material.

[0067] Comparative Example 2

[0068] This comparative example discloses a tailings filling cementitious material, which is prepared by the following steps: 60 kg of blast furnace slag, 20 kg of cement, 20 kg of gypsum and 19 kg of the promoting component prepared in Preparation Example 6 are stirred and mixed to form the cementitious material.

[0069] Comparative Example 3

[0070] This comparative example discloses a tailings filling cementitious material, which is prepared by the following steps: 60 kg of blast furnace slag, 20 kg of cement, 20 kg of gypsum and 19 kg of the promoting component prepared in Preparation Example 7 are stirred and mixed to form the cementitious material.

[0071] Comparative Example 4

[0072] This comparative example discloses a tailings filling cementitious material, which is prepared by the following steps: 60 kg of blast furnace slag, 20 kg of cement and 20 kg of gypsum are stirred and mixed as the cementitious material.

[0073] Application Examples

[0074] Application Example 1

[0075] This application example discloses a use of tailings filling gelling material, which includes the following steps: mixing fine tailings and the gelling material prepared in Example 1 in a weight ratio of 13:1 and then filling, wherein the concentration of the fine tailings is 53%.

[0076] Application Example 2

[0077] This application example discloses a use of tailings filling gelling material, which includes the following steps: mixing fine tailings and the gelling material prepared in Example 2 in a weight ratio of 13:1 and then filling, wherein the concentration of the fine tailings is 53%.

[0078] Application Example 3

[0079] This application example discloses a use of tailings filling gelling material, which includes the following steps: mixing fine tailings and the gelling material prepared in Example 3 in a weight ratio of 13:1 and then filling, wherein the concentration of the fine tailings is 53%.

[0080] Application Example 4

[0081] This application example discloses a use of tailings filling gelling material, which includes the following steps: mixing fine-grained tailings and the gelling material prepared in Example 4 in a weight ratio of 13:1 and then filling, wherein the concentration of the fine-grained tailings is 53%.

[0082] Application Example 5

[0083] This application example discloses a use of tailings filling gelling material, which includes the following steps: mixing fine-grained tailings and the gelling material prepared in Example 5 in a weight ratio of 13:1 and then filling, wherein the concentration of the fine-grained tailings is 53%.

[0084] Application Example 6

[0085] This application example discloses a use of tailings filling gelling material, which includes the following steps: mixing fine-grained tailings and the gelling material prepared in Example 6 in a weight ratio of 13:1 and then filling, wherein the concentration of the fine-grained tailings is 53%.

[0086] Application Example 7

[0087] This application example discloses a use of tailings filling gelling material, which includes the following steps: mixing fine tailings and the gelling material prepared in Comparative Example 1 at a weight ratio of 13:1 and then filling, wherein the concentration of the fine tailings is 53%.

[0088] Application Example 8

[0089] This application example discloses a use of tailings filling gelling material, which includes the following steps: mixing fine tailings and the gelling material prepared in Comparative Example 2 in a weight ratio of 13:1 and then filling, wherein the concentration of the fine tailings is 53%.

[0090] Application Example 9

[0091] This application example discloses a use of tailings filling gelling material, which includes the following steps: mixing fine tailings and the gelling material prepared in Comparative Example 3 in a weight ratio of 13:1 and then filling, wherein the concentration of the fine tailings is 53%.

[0092] Application Example 10

[0093] This application example discloses a use of tailings filling gelling material, which includes the following steps: mixing fine tailings and the gelling material prepared in Comparative Example 4 in a weight ratio of 13:1 and then filling, wherein the concentration of the fine tailings is 53%.

[0094] Performance testing

[0095] According to the disclosure in Application Examples 1-10, fine-grained tailings were mixed with cementitious materials and stirred for 5 minutes to form a cementitious slurry. This slurry was poured into a 4cm×4cm×16cm triple test mold and immediately compacted using a ZT-96 cement mortar specimen compaction table. The compacted specimens were cured under standard curing conditions: 20°C and a relative humidity of ≥90%.

[0096] The test specimens were tested for 3d and 28d compressive strength using a testing machine. The specific test data are shown in Table 1.

[0097] Table 1 Performance test data table

[0098]

[0099]

[0100] From application examples 1-3 and Table 1, it can be seen that by adjusting the ratio of the accelerator, compensator and connector, the performance of the cementitious material can be adjusted, so that the cementitious material can better promote the formation of the early strength of the cemented body after being mixed with the fine tailings.

[0101] Combining Application Examples 2, 4, 6, and 7 with Table 1, it can be seen that when alunite and anhydrous calcium sulfoaluminate are used as compensating agents, the early strength of the cementitious material develops rapidly during the hydration process because C3A is affected by the chloride ions provided by calcium chloride and aluminum chloride to generate a large amount of hydrated calcium chloroaluminate. However, at the same time, the cementitious material shrinks due to the large amount of hydrated calcium chloroaluminate. Alum and anhydrous calcium sulfoaluminate combine with calcium hydroxide in the hydration process to generate hydrated calcium sulfoaluminate, which improves the tensile strength of the cementitious material while compensating for the shrinkage of the cementitious material, thereby reducing the adverse effects of shrinkage.

[0102] Combining Application Example 2, Application Example 5, Application Example 6 and Application Example 7 with Table 1, it can be seen that calcium chloride and aluminum chloride provide chloride ions to promote the conversion of C3A into calcium chloroaluminate hydrate during the hydration process of the gel material, thereby accelerating the early strength development of the gel material, effectively improving the early strength of the gel material, and further effectively improving the tailings filling solidification efficiency.

[0103] From Application Examples 2 and 8-10 and Table 1, it can be seen that the carrier acts as a load for the accelerator and the compensator, the adhesive resin enhances the connection strength of the accelerator and the compensator on the carrier, and the protective fiber is located in the outer layer to protect the accelerator and the compensator, so that the accelerator and the compensator can be in adjacent positions during the mixing process and play a role, which is beneficial to promote the early strength development of the cementitious material while compensating for shrinkage and improving the overall stability.

[0104] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A tailings filling gelling material for improving the compressive strength of fine-grained tailings paste consolidation body, characterized in that: The invention comprises the following raw materials in parts by weight: 50-70 parts of blast furnace slag, 15-25 parts of cement, 15-25 parts of gypsum, and 17-22 parts of a promoting component, wherein the promoting component comprises an accelerator, a compensating agent, and a connecting agent, and the weight ratio of the accelerator, the compensating agent, and the connecting agent is 3-6:2-4:12; The connecting agent includes a support, an adhesive resin and a protective fiber, wherein the weight ratio of the support, the adhesive resin and the protective fiber is 4:1:1; The support comprises phosphogypsum, modified corn starch and triethanolamine, wherein the weight ratio of the phosphogypsum, modified corn starch and triethanolamine is 10:1:1; The support is prepared by the following steps: adding water to modified corn starch to prepare an adhesive, then mixing it with phosphogypsum and triethanolamine, granulating it through a disc, and drying it to obtain the support; The promoting component is prepared by the following steps: firstly, mixing the support body and the adhesive resin, adding the promoting agent and the compensating agent and continuing to stir, adding the protective fiber after stirring evenly, continuing to stir evenly and then drying to prepare the promoting component.

2. The tailings filling gelling material for improving the compressive strength of fine-grained paste tailings consolidation body according to claim 1, characterized in that: The accelerator includes calcium chloride and aluminum chloride, and the weight ratio of the calcium chloride to the aluminum chloride is 2:

1.

3. The tailings filling gelling material for improving the compressive strength of fine-grained paste tailings consolidation body according to claim 1, characterized in that: The compensating agent includes alunite and anhydrous calcium sulfoaluminate, and the weight ratio of the alunite to the anhydrous calcium sulfoaluminate is 1:

1.

4. The use of the tailings filling gelling material for improving the compressive strength of fine-grained paste tailings consolidation body according to any one of claims 1 to 3, characterized in that: Fine tailings and cementitious materials are mixed for filling, the concentration of fine tailings is 53%, and the weight ratio of fine tailings to cementitious materials is 13:1.

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