A method for expanding a seepage-proof wet tailings pond

Abstract

The application discloses a kind of anti-infiltration type wet tailings pond expansion methods, utilize the dam body of existing tailings pond, horizontal anti-infiltration system, under the premise of basically not increasing land, utilize newly-built clarification pond or the clarification pond in the newly-built tailings pond in close proximity as the water storage pool of drainage flood discharge when the tailings pond that has served to terminal period counterstacks height expansion, under the condition of increasing overflow channel, drainage open channel, clarification pond, by ore drawing, realize accumulation dam building, can greatly increase reservoir capacity, especially in the expansion of some large area tailings pond will obtain huge reservoir capacity, extend the service life of tailings pond for mine, save the reservoir capacity and investment of newly-built tailings pond, create huge benefits for mining enterprises, while also can save land.

Description

Technical Field

[0001] This invention relates to the field of non-coal mines, and more particularly to the field of tailings dam expansion, specifically a method for expanding a seepage-proof wet tailings dam in the field of non-coal mines. Background Technology

[0002] A tailings dam is a site constructed by damming valleys or enclosing land to store tailings or other industrial waste discharged after ore beneficiation in metal or non-metal mines. With the increasing emphasis on environmental protection in recent years, the promulgation of the "Law of the People's Republic of China on the Prevention and Control of Environmental Pollution by Solid Waste" and the implementation of the "Pollution Control Standards for General Industrial Solid Waste Storage and Disposal Sites" have prompted many tailings meeting Class II standards to require full-scale horizontal seepage prevention during storage. Generally, this type of tailings dam is constructed in a single phase, and tailings are wet-discharged into the dam via pipelines; this type of tailings dam is called a seepage-proof wet-discharge tailings dam.

[0003] Currently, seepage-proof wet tailings dams typically only utilize the dam crest elevation before ceasing tailings discharge. To maintain continued production, mining companies generally construct a new seepage-proof tailings dam adjacent to an existing one, especially in relatively flat areas. However, building a new tailings dam often requires extensive land acquisition, significant investment, and a long construction period. If existing tailings dams can be fully utilized for expansion, one less dam may need to be built. Alternatively, after constructing a second tailings dam, the two dams can be linked together, significantly increasing their combined capacity and generating profits for the company. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention aims to provide a method for expanding the capacity of a seepage-proof wet tailings dam that has reached the end of its service life. By utilizing a newly added clarification pond as a storage pond for the tailings dam that has reached the end of its service life, the method allows for reverse stacking and "capping" expansion within the tailings dam, thus solving the problem that seepage-proof wet tailings dams cannot be effectively expanded in their final stages.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for expanding a seepage-proof wet-discharge tailings dam is characterized by setting up a clarification pond in the downstream area surrounding the expanded tailings dam as a storage pond, and simultaneously constructing an open drainage channel within the tailings dam to drain accumulated water into the aforementioned clarification pond, within the seepage-proof range of the tailings dam. boundary A tailings dam is constructed within the designated area. The tailings dam includes a sub-dam and a tailings alluvial discharge site. The sub-dam and the seepage prevention zone are connected. boundary Overflow channels are installed between the lines to discharge tailings into the dam and seepage prevention area. boundaryOverflow or seepage water generated during ore discharge is set between the lines. The overflow channel is an inverted trapezoid with one side being the seepage-proof slope inside the tailings pond and the other side being the outer slope of the accumulation sub-dam. Wet ore discharge is carried out at the top of the accumulation sub-dam. It is required that the beach surface inside the tailings pond rises evenly. When the beach surface inside the pond rises to the top of the accumulation sub-dam, the ore discharge sub-dam can continue to be built, and ore discharge can be cyclically carried out until the final expansion elevation is reached, which can obtain a large amount of new pond capacity.

[0007] Furthermore, the clarification pool can be a newly built clarification pool or a clarification pool within an adjacent newly built tailings dam can be used directly.

[0008] Furthermore, the clarification tank needs to be fully horizontally leak-proof.

[0009] Furthermore, the drainage channel needs to be horizontally seepage-proofed.

[0010] Furthermore, the sub-dam can be constructed using coarse tailings from within the reservoir, local soil and rock materials, or known technologies such as membrane bag dam construction.

[0011] Furthermore, the overflow channel is about 1-3m lower in elevation than the top of the seepage prevention boundary line, and has a bottom width of 2-10m.

[0012] Beneficial effects of the present invention

[0013] This invention provides a method for expanding seepage-proof tailings dams, creatively proposing the use of newly built clarification ponds or clarification ponds within adjacent newly built tailings dams as drainage and flood control reservoirs during the backfilling and expansion of tailings dams that have reached the end of their service life. This solves the problem of the inability to effectively expand seepage-proof tailings dams in their final stages. This method utilizes the existing tailings dam body and horizontal seepage prevention system, adding only overflow channels, drainage channels, and clarification ponds without significantly increasing land use. By releasing ore to achieve dam construction, the dam capacity can be greatly increased, especially in the expansion of large-area tailings dams, extending the service life of the tailings dam for the mine, saving on the capacity and investment of newly built tailings dams, creating significant profits for mining enterprises, and also saving land. Attached Figure Description

[0014] Figure 1 This is a cross-sectional schematic diagram of the expanded tailings dam according to an embodiment of the present invention.

[0015] Figure 2 A schematic diagram of the expanded tailings dam according to an embodiment of the present invention;

[0016] The names corresponding to the labels in the attached diagram are: 1—tailings dam, 2—tailings pond that has reached the end of its service life, 3—boundary line of the seepage prevention area, 4—overflow channel, 5—new storage capacity, 6—tailings accumulation dam, 7—clarification pond, 8—drainage channel. Detailed Implementation

[0017] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] The following are preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

[0019] 1. First, a clarification pond 7 shall be constructed in the downstream area of ​​the tailings dam 1 and the tailings pond 2, which will serve the end of its service life; the clarification pond shall be horizontally seepage-proof; the clarification pond may also be a clarification pond in the newly constructed tailings pond that is adjacent to it.

[0020] 2. A drainage channel 8 shall be provided in the tailings dam 2 at the end of its service life; the drainage channel shall be horizontally seepage-proof; the drainage channel shall meet the requirement of draining the accumulated water in the tailings dam at the end of its service life to the newly built clarification pond downstream.

[0021] 3. A tailings dam 6 shall be constructed within the boundary line 3 of the seepage prevention range of the tailings dam 2 until the end of its service period; the tailings dam 6 shall include a sub-dam and a tailings alluvial discharge site; the sub-dam may be constructed by piling up coarse tailings in the dam, or by piling up local soil and rock materials, or by using known technologies such as membrane bag dam construction.

[0022] 4. An overflow channel 4 is set between the sub-dam and the boundary line of the seepage prevention area; the overflow channel 4 is generally an inverted trapezoid, with one side being the seepage prevention slope inside the reservoir and the other side being the outer slope of the sub-dam; the overflow channel 4 is about 1 to 3 meters lower than the top elevation of the boundary line of the seepage prevention area, and the bottom width is 2 to 10 meters.

[0023] 5. Wet discharge of ore shall be carried out at the top of the dam, requiring the beach surface in the reservoir to rise evenly.

[0024] 6. When the beach surface in the reservoir rises to the top of the sub-dam, the ore-discharging sub-dam can continue to be built and the ore can be discharged in a cycle until it is piled up to the final expansion elevation, which can obtain a large amount of new reservoir capacity with "caps".

[0025] Example:

[0026] The original design of a certain tailings dam resulted in a final effective storage capacity of approximately 6400 × 10⁻⁶. 4 m 3 The top area of ​​the tailings dam is approximately 270 × 10. 4 m 3By implementing the aforementioned tailings wet discharge and dam construction scheme, the dam height was increased by approximately 15 meters, directly creating a new storage capacity of approximately 2800 × 10⁶ meters on top of the original dam. 4 m 3 This has generated huge benefits for the company.

Claims

1. A method for expanding a seepage-proof wet tailings dam, characterized in that, A clarification pond is constructed downstream of the tailings dam to serve as a reservoir for the expanded tailings dam. Simultaneously, an open drainage channel is installed within the tailings dam to drain accumulated water into the clarification pond. A tailings dam is constructed within the boundary of the tailings dam's seepage prevention zone. This tailings dam includes a sub-dam and a tailings alluvial discharge point. An overflow channel is constructed between the sub-dam and the boundary of the seepage prevention zone to discharge overflow or seepage water generated during tailings discharge between the sub-dam and the boundary. The overflow channel is trapezoidal, with one side being the seepage prevention slope within the dam and the other side being the outer slope of the sub-dam. Wet discharge is carried out at the top of the sub-dam, requiring the tailings dam surface to rise uniformly. When the surface rises to the top of the sub-dam, the discharge sub-dam is continuously constructed, and the discharge cycle continues until the final expansion elevation is reached, resulting in a significant increase in dam capacity.

2. The method for expanding a seepage-proof wet tailings dam according to claim 1, characterized in that, The clarification pond can be a newly built clarification pond or a clarification pond within an adjacent newly built tailings dam can be used directly.

3. A method for expanding a seepage-proof wet tailings dam according to claim 1 or 2, characterized in that, The clarification tank needs to be fully horizontally leak-proof.

4. The method for expanding a seepage-proof wet tailings dam according to claim 1, characterized in that, The drainage channel needs to be horizontally seepage-proofed.

5. The method for expanding a seepage-proof wet tailings dam according to claim 1, characterized in that, The sub-dams are constructed using coarse tailings from the reservoir, local soil and rock materials, or membrane bag dam construction techniques.

6. The method for expanding a seepage-proof wet tailings dam according to claim 1, characterized in that, The overflow channel is 1-3m lower than the top elevation of the seepage prevention zone boundary line, and 2-10m wider at the bottom.

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