An open-pit mine water collection and pulp-making system and its application

Abstract

The present invention belongs to the technical field of open-pit mine resource recovery, and particularly relates to a water body collection and pulp-making system and application in an open-pit mine. It includes a collection system and a pulp-making system. The collection system includes a surface runoff collection system arranged in the non-mining area of the open-pit mine and an ore-bearing water body collection system arranged in the mining area of the open-pit mine. The pulp-making system includes a grit chamber and a pulp-making tank connected in sequence. The surface runoff collection system is connected to a water body storage repository through a sedimentation tank. The ore-bearing water body collection system is connected to the pulp-making tank through the grit chamber. A slurry pump is arranged in the pulp-making tank. The water body storage repository is also connected to the pulp-making tank through a water body conveying pipeline. By means of the two sets of collection systems, the present invention separates and processes the water body without mineral particles from the water body containing minerals, which not only saves the cost of ore dressing water, but also can recover minerals and reduce the environmental pollution caused by the discharge of ore-bearing water bodies.

Description

Technical Field

[0001] The invention belongs to the technical field of open-pit mine resource recovery, and in particular relates to a water collection and pulping system in an open-pit mine and its application. Background Art

[0002] For open-pit mines with abundant annual rainfall, atmospheric rainfall is an unfavorable factor that causes the stability of the mining area slopes and is also the main source of groundwater recharge. For hillside open-pit mines, the drainage system is easily destroyed as the advancement line moves, resulting in an unstable drainage system; for sunken open-pit mines, the seasonal runoff and seepage are large, and it is impossible to implement sewage diversion, which makes drainage difficult and costly. For the above reasons, it is difficult to effectively organize and drain atmospheric rainfall and abundant fissure water in the ore body and rock body in the open-pit mine; they usually flow into the mining area disorderly through surface runoff or natural water level difference, hindering normal mining operations.

[0003] During the mining operation, the ore and rock transportation equipment repeatedly crushes and disturbs the mining platform, and fine-grained minerals are easily formed on the contact surface. Under the leaching and transportation of surface runoff, the fine-grained minerals are suspended in the water body to form a certain concentration of mineral powder slurry. Due to the high mineral content, this part of the mineral powder slurry has a high economic value. However, the mineral powder slurry is scattered in various mining operation areas, with many surfaces and wide points, and it is difficult to fully collect it; most open-pit mines have not established a special collection system to comprehensively utilize the mineral powder slurry, but the mineral powder slurry is used together with surface runoff water as mine wastewater for physical precipitation or chemical treatment. However, due to the fine particle size of the suspended mineral particles in the slurry, 80% of the particle size is below -200 mesh, and the physical or chemical treatment effect is poor, which is not conducive to the development of the mine environment, and also causes a large amount of mineral resources to be lost.

[0004] How to deal with surface runoff in mines and the mineral powder slurry formed in mining areas is a technical problem that needs to be solved urgently in open-pit mining. Summary of the invention

[0005] In order to solve the above problems, one of the objects of the present invention is to provide a water collection and slurry making system in an open pit.

[0006] The technical solution of the present invention is:

[0007] A water collection and pulping system in an open-pit mine, comprising a collection system and a pulping system, wherein the collection system comprises a surface flow collection system arranged in a non-mining area of the open-pit mine and a mineral-bearing water collection system arranged in a mining area of the open-pit mine, and the pulping system comprises a grit tank and a pulping tank connected in sequence; the surface flow collection system is connected to a water storage reservoir via a sedimentation tank, the mineral-bearing water collection system is connected to a pulping tank via a grit tank, a slurry pump is arranged in the pulping tank, and the water storage reservoir is also connected to the pulping tank via a water transport pipeline.

[0008] Preferably, the surface runoff collection system and the ore-bearing water body collection system include drainage facilities arranged in their respective areas, and the drainage facilities include canals, flood intercepting ditches, slope step drainage ditches, chutes and / or diversion canals.

[0009] Preferably, the sedimentation tank, the water storage reservoir, the sand settling tank, and the slurry making tank are all formed by enclosing with a partition dam bent in a loop shape. A first overflow weir is arranged on the sedimentation tank to connect with the water storage reservoir, and a second overflow weir is arranged on the sand settling tank to connect with the slurry making tank.

[0010] Preferably, the sedimentation tank includes a coarse sand sedimentation tank and a fine sand sedimentation tank connected in sequence. The end of the collection system is connected to the coarse sand sedimentation tank, and the first overflow weir is arranged between the fine sand sedimentation tank and the water storage reservoir.

[0011] Preferably, the partition dam is an earth-rock dam, and the side wall of the partition dam is set as a slope surface, so that the cross-sections of the sedimentation tank, the water storage reservoir, the sand settling tank, and the slurry making tank are in an open trapezoidal shape; a 30 cm thick acid-resistant reinforced concrete layer is also poured on the surface of the slope surface.

[0012] Preferably, the water storage reservoir further includes a neutralization and acid removal chemical dosing device, and an HDPE membrane anti-seepage system is also arranged inside the water storage reservoir.

[0013] Preferably, around the sedimentation tank and the sand settling tank, a dredging road is arranged along the loop-shaped gap of the partition dam.

[0014] Preferably, the water storage reservoir is also provided with a water pump for connecting to the ore dressing system, and the slurry making tank is also connected to the ore pulp conveying system, and the ore pulp conveying system is used to convey the ore pulp in the slurry making tank to the grinding and flotation system of the ore dressing plant.

[0015] Preferably, the water conveying pipeline includes a siphon and a siphon gate valve, and is used for unidirectionally taking water from the water storage reservoir to the slurry making tank.

[0016] Another object of the present invention is to provide a working method of the above-mentioned water body collection and slurry making system in an open-pit mine, and the process is as follows: the surface runoff collection system collects surface water bodies and enters the sedimentation tank, and after precipitation, it flows into the water storage reservoir for supplementing the water used in ore dressing; the ore-bearing water body collection system collects water bodies in the mining area and enters the sand settling tank, and after sand settling treatment, it flows into the slurry making tank. The slurry pump in the slurry making tank stirs and makes the ore-bearing water body into slurry to the required concentration and conveys it to the grinding and flotation system to facilitate the flotation and collection of useful minerals;

[0017] When the amount of water for making slurry in the slurry making tank is insufficient, the water in the water storage reservoir is conveyed to the slurry making tank through the water conveying pipeline to meet the slurry making requirements.

[0018] The beneficial effects of the present invention are as follows:

[0019] In the open-pit mine, two systems, namely the surface runoff collection system and the ore-bearing water body collection system, are set up by zoning to separate clear water (atmospheric rainfall without mineral particles and seepage water from slope fissures) and sewage (water body containing ore powder).

[0020] The sewage has a high ore content. After being treated by sand sedimentation and pulp making, the ore pulp liquid directly enters the grinding and flotation system, which can efficiently recover minerals and reduce the environmental pollution caused by sewage discharge at the same time.

[0021] The clear water is treated by general sedimentation, and the treatment cost is low. A large amount of water is required for ore dressing. Most of the production water is recycled and used in the tailings pond. Due to the loss in ore dressing, a part of the production water needs to be supplemented, increasing the production cost. The clear water treated by the surface runoff collection system can be transported as water resources to the ore dressing system to supplement the production water, saving costs. The treated clear water can also be discharged after meeting the standards as natural water resources. After the clear water is sedimented, it can also supplement the pulp making water when the pulp making water is insufficient, facilitating the adjustment of the pulp concentration and matching the flotation requirements in the mine.

[0022] The water body collection and pulp making system provided by the present invention fully collects and utilizes the water resources within the scope of the open-pit mine, not only saving water but also saving a large amount of production cycle water return transportation costs, and can generate good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the present invention;

[0024] Figure 2 is Figure 1 a sectional view taken along line A-A' in, showing the connection between the sedimentation tank and the water body storage tank;

[0025] Figure 3 is Figure 1 a sectional view taken along line B-B' in, showing the connection between the sand sedimentation tank and the pulp making tank;

[0026] Figure 4 is Figure 1 a sectional view taken along line C-C' in.

[0027] The meanings of the reference symbols in the drawings are as follows:

[0028] 10 - sand sedimentation tank 20 - pulp making tank 21 - slurry pump 22 - ore pulp conveying device

[0029] 30 - sedimentation tank 31 - coarse sand sedimentation tank 32 - fine sand sedimentation tank

[0030] 40 - water body storage tank 41 - HDPE membrane anti-seepage system 411 - anchorage groove 42 - water pump 43 - neutralization and acid removal chemical dosing device

[0031] 50 - Water conveyance pipeline 51 - Siphon 52 - Siphon gate valve

[0032] 60 - Separation dam 71 - First overflow weir 72 - Second overflow weir 80 - Dredging road

[0033] A - Ore dressing system B - Ore dressing plant grinding and flotation system Specific implementation mode

[0034] The technical solution of the invention will be described below in conjunction with the specification drawings and embodiments for the convenience of those skilled in the art to understand.

[0035] As Figure 1-3 shown, a water body collection and pulp making system in an open - pit mine includes a collection system and a pulp making system. The collection system includes a surface runoff collection system arranged in the non - mining area of the open - pit mine and an ore - bearing water body collection system arranged in the mining area of the open - pit mine, including various drainage facilities such as canals, flood - intercepting ditches, slope step drainage ditches, chutes, diversion channels, etc. arranged in the mining area and non - mining area respectively.

[0036] The surface runoff collection system is connected to the water body storage reservoir 40 through the sedimentation tank 30. The sedimentation tank 30 includes a coarse sand sedimentation tank 31 and a fine sand sedimentation tank 32 connected in sequence. The end of the collection system is connected to the coarse sand sedimentation tank 31, and a first overflow weir 71 is arranged on the fine sand sedimentation tank 32 to connect with the water body storage reservoir 40. The surface runoff collection system first conveys the collected water body to the coarse sand sedimentation tank 31. After sedimentation, the water body overflows to the fine sand sedimentation tank 32 and finally overflows into the water body storage reservoir 40 for temporary storage.

[0037] The pulp making system includes a sand sedimentation tank 10 and a pulp making tank 20 connected in sequence. A slurry pump 21 is arranged in the pulp making tank 20. The ore - bearing water body collection system is connected to the pulp making tank 20 through the sand sedimentation tank 10. The ore - bearing water body collection system collects the water body in the mining area and enters the sand sedimentation tank 10. After sand sedimentation treatment, it flows into the pulp making tank 20. The slurry pump 21 in the pulp making tank 20 stirs the ore - bearing water body to make pulp to the required concentration to form a slurry convenient for flotation.

[0038] Furthermore, the above - mentioned sedimentation tank 30, water body storage reservoir 40, sand sedimentation tank 10, and pulp making tank 20 are all surrounded by a separation dam 60 in a U - shaped bend. The sedimentation tank 30 and the sand sedimentation tank 10 are respectively arranged as long and narrow flow channels along the U - shaped path of the separation dam 60 to facilitate the sedimentation of sand and gravel in the water body.

[0039] The separation dam 60 is an earth-rock dam and can be constructed with waste rock from mining stripping; the side walls of the separation dam 60 are set as slopes, so that the cross-sections of the sedimentation tank 30, the water storage reservoir 40, the grit chamber 10, and the slurry preparation tank 20 are in an open trapezoidal shape; a 30-cm-thick acid-resistant reinforced concrete layer is also poured on the slope surface of the separation dam 60. Around the sedimentation tank 30 and the grit chamber 10, a dredging road 80 is also set on the top surface of the dam body of the separation dam 60 that bends in a circular shape, which is convenient for a long-arm excavator to clean the sediment, stones, and mud in the grit chamber 10, the coarse sand sedimentation tank 31, and the fine sand sedimentation tank 32 during mining operations.

[0040] The water storage reservoir 40 also includes a neutralization and acid removal chemical dosing device 43, which can be used to input chemicals such as flocculants and / or lime to adjust the water treatment effect. An HDPE membrane is laid in the water storage reservoir 40 to form an HDPE membrane anti-seepage system 41, and the edge of the HDPE membrane is anchored in an anchor groove 411 provided on the top of the separation dam 60 of the water storage reservoir 40.

[0041] To facilitate water utilization, a water pump 42 is also set in the water storage reservoir 40 for connecting to the ore dressing system A; the slurry preparation tank 20 is also connected to a slurry conveying device 22, and the slurry conveying device 22 is used to convey the re-prepared slurry stirred to a usable concentration in the slurry preparation tank 20 to the grinding and flotation system B of the ore dressing plant.

[0042] To ensure the normal operation of the slurry preparation tank 20 and facilitate the adjustment of the slurry preparation concentration, the water storage reservoir 40 is also connected to the slurry preparation tank 20 through a water conveying pipeline 50. The water conveying pipeline 50 includes a siphon 51 and a siphon gate valve 52, which are used to take water unidirectionally from the water storage reservoir 40 to the slurry preparation tank 20. When the amount of water for slurry preparation in the slurry preparation tank 20 is insufficient, the water in the water storage reservoir 40 is conveyed to the slurry preparation tank 20 through the water conveying pipeline 50 to meet the slurry preparation requirements.

[0043] In the present invention, the sizes of the collection and ore dressing systems are not specifically limited. The size and length of the sedimentation tank 30 can be determined according to the sedimentation distance of sand and gravel. The sizes of the water storage reservoir 40 and the slurry preparation tank can be designed according to the maximum volume of ore powder slurry produced during the longest maintenance period in the mine. Additionally, the chemicals used in the neutralization and acid removal chemical dosing device 43 are adjusted according to the acidity of the water body, etc., and the present invention does not make specific limitations either.

[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the invention.

Claims

1. An open-pit mine water collection and pulp-making system, characterized in that It includes a collection system and a pulp-making system. The collection system includes a surface runoff collection system arranged in the non-mining area of the open-pit mine and an ore-bearing water body collection system arranged in the mining area of the open-pit mine. The pulp-making system includes a grit chamber (10) and a pulp-making tank (20) connected in sequence. The surface runoff collection system is connected to a water body storage reservoir (40) through a sedimentation tank (30). The ore-bearing water body collection system is connected to the pulp-making tank (20) through the grit chamber (10). A slurry pump (21) is arranged in the pulp-making tank (20). The water body storage reservoir (40) is also connected to the pulp-making tank (20) through a water body conveying pipeline (50). The sedimentation tank (30), the water body storage reservoir (40), the grit chamber (10), and the pulp-making tank (20) are all enclosed by a partition dam (60) in a U-shaped bend. A first overflow weir (71) is arranged on the sedimentation tank (30) to connect with the water body storage reservoir (40). A second overflow weir (72) is arranged on the grit chamber (10) to connect with the pulp-making tank (20). The water body storage reservoir (40) is also provided with a water pump (42) for connecting to a beneficiation system (A). The pulp-making tank (20) is also connected to a pulp conveying device (22). The pulp conveying device (22) is used to convey the pulp in the pulp-making tank (20) to a grinding and flotation system (B).

2. The water body collection and pulping system in an open-pit mine as described in claim 1, characterized in that, The surface runoff collection system and the ore-bearing water body collection system include drainage facilities arranged in their respective areas. The drainage facilities include water channels, flood interception ditches, slope step drainage ditches, and chute spillways.

3. A water collection and pulp making system in an open-pit mine as described in claim 1, characterized in that, The sedimentation tank (30) includes a coarse sand sedimentation tank (31) and a fine sand sedimentation tank (32) connected in sequence. The end of the surface runoff collection system is connected to the coarse sand sedimentation tank (31). The first overflow weir (71) is arranged between the fine sand sedimentation tank (32) and the water body storage reservoir (40).

4. A water collection and pulp making system in an open-pit mine as claimed in claim 1, characterized in that, The partition dam (60) is an earth-rock dam. The side wall of the partition dam (60) is set as a slope surface, so that the cross-sections of the sedimentation tank (30), the water body storage reservoir (40), the grit chamber (10), and the pulp-making tank (20) are in an open trapezoidal shape. A 30 cm thick acid-resistant reinforced concrete layer is also poured on the surface of the slope.

5. The water body collection and pulp making system in an open-pit mine as claimed in claim 1, characterized in that, The water body storage reservoir (40) also includes a neutralization and acid removal chemical dosing device (43). The water body storage reservoir (40) is also provided with an HDPE membrane anti-seepage system (41).

6. A water collection and pulping system in an open-pit mine as described in claim 1, characterized in that, Around the sedimentation tank (30) and the grit chamber (10), a dredging road (80) is arranged on the top surface of the dam body of the partition dam (60).

7. A water collection and pulp making system in an open-pit mine as described in claim 1, characterized in that, The water body conveying pipeline (50) includes a siphon (51) and a siphon gate valve (52), and is used to unidirectionally draw water from the water body storage reservoir (40) to the pulp-making tank (20).

8. A working method of a water body collection and pulping system in an open-pit mine as described in any one of claims 1-7, characterized in that, The process is as follows: The surface runoff collection system collects surface water bodies and enters the sedimentation tank (30). After sedimentation, it flows into the water body storage reservoir (40) for supplementing beneficiation water. The ore-bearing water body collection system collects water bodies in the mining area and enters the grit chamber (10). After grit treatment, it flows into the pulp-making tank (20). The slurry pump (21) in the pulp-making tank (20) stirs and makes pulp of the ore-bearing water body to the required concentration to facilitate the flotation system to collect useful minerals. When the amount of water for pulp making in the pulp making pool (20) is insufficient, the water in the water storage repository (40) is transported to the pulp making pool (20) through the water transportation pipeline (50) to meet the pulp making requirements.

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