Fractional precipitation drainage system for fixed pump station of open stope
By adding first- and second-level sedimentation tanks in front of the water collection tank of the fixed pump station in the open-pit mining site, and setting up a gravel filter layer between the sedimentation tanks, the problem of large mud content in the groundwater during the drainage process of the fixed pump station is solved, the service life of the fixed pump is extended, and the safety and reliability of the drainage system is ensured.
Patent Information
- Application Number
- CN202422176745.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-09-05
AI Technical Summary
During the drainage process of the fixed pump station in the open-pit mining yard, the groundwater contains a large amount of mud, resulting in frequent damage and failure of the fixed pump, and the pump pool is difficult to silt, which cannot meet the actual needs of on-site production.
A graded sedimentation and drainage system was designed, including setting up a first-level sedimentation tank, a first-level gravel filtration layer, a second-level sedimentation tank, a second-level gravel filtration layer and a water collection tank on the fixed pump station platform. The groundwater is pumped to the first-level sedimentation tank through a mobile pump, and then flows to the water collection tank after passing through two gravel filtration layers. The fixed pump pumps pumps and drains water from the water collection tank.
Through the design of the graded precipitation and gravel filter layer, the mud content of groundwater is significantly reduced, the faults and damage of the fixed pump are avoided, the service life of the fixed pump is extended, the safety and reliability of the drainage system is ensured, and the impact on the bottom production operations of the open-pit mining site is reduced.
Smart Images
Figure CN223042345U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of open-pit mine drainage, and particularly relates to a hierarchical sedimentation drainage system for a fixed pump station in an open-pit stope. Background Art
[0002] During the process of open-pit mine exploitation, the drainage problem has a crucial impact on the development of open-pit mines. When developing large-water open-pit mines, underground water inflow and surface precipitation often converge at the bottom of the open-pit stope. It is necessary to drain the water out of the open-pit boundary in time so that mining and stripping operations can be carried out at the bottom. If the drainage is not timely or there is a drainage failure, the underground water often floods the mining and stripping working face at the bottom of the open-pit, resulting in the occurrence of production safety accidents. When facing open-pit mines with relatively small mining depths, mobile pumps can generally be used to directly drain the underground water at the bottom of the pit out of the open-pit boundary. If facing open-pit mines with relatively large mining depths, due to the limited lift of mobile pumps, the underground water at the bottom of the pit cannot be completely drained out of the open-pit boundary. Therefore, it is necessary to establish a fixed pump station at the platform in the middle of the mining depth of the open-pit stope. First, the mobile pump at the bottom of the pit drains the underground water at the bottom of the pit into the sump of the fixed pump station, and then the fixed pump relays the underground water in the sump to the outside of the open-pit boundary.
[0003] While the underground water at the bottom of the open-pit stope is drained out, blasting and loading operations are often carried out at the bottom of the pit. When descending or constructing near the mobile pump pool at the bottom of the pit, a large amount of sediment is accompanied by the drained underground water. The underground water carrying a large amount of sediment is drained into the sump of the fixed pump station. Usually in this case, submersible sewage pumps are generally used as the fixed pumps in the fixed pump station, which can accept and drain sewage with a certain mud content. If the mud content of the sewage exceeds a certain level, it will cause malfunction and damage to the fixed pump and shorten the service life of the water pump. Once the fixed pump station fails, the mining and stripping working face at the bottom of the open-pit will be quickly flooded by water, and in severe cases, it will cause immeasurable losses. Therefore, the mud content of the underground water drained by the fixed pump should be minimized to ensure the safe and reliable drainage of the fixed pump station.
[0004] At present, the mud content of the underground water drained by the fixed pump station in the open-pit stope is generally controlled at the front end, that is, by trying to control the sediment at the bottom of the pit from mixing into the drained underground water or by adding filter meshes in the fixed pump pool, etc., to control the mud content of the underground water drained by the fixed pump. An existing drainage device at the bottom of the open-pit stope uses a new drainage method of "new mobile pump pool + centrifugal pump" at the bottom of the open-pit stope. The new mobile pump pool tries to naturally clarify the sewage, alleviating problems such as a large amount of sediment in the sewage in the traditional pump pool during the process of stope descending or constructing near the pump pool. However, the effect of filtering the sewage through the gravel retaining wall is limited. At the same time, it is inevitable that a large amount of sediment will mix into the underground water during the mining and stripping operations at the bottom of the pit, resulting in the mud content of the underground water drained into the fixed pump pool not being effectively controlled and unable to meet the actual production requirements on site. Content of the Utility Model
[0005] The utility model provides a stepped sedimentation drainage system for a fixed pump station in an open-pit stope. The technical problems to be solved are as follows: to solve the problems of high mud content in groundwater during the drainage process of the traditional fixed pump station, frequent damage failures of fixed pumps, and difficult dredging of pump pits.
[0006] To solve the above technical problems, the utility model provides a stepped sedimentation drainage system for a fixed pump station in an open-pit stope, which is characterized in that it includes a primary sedimentation tank, a primary gravel filtration layer, a secondary sedimentation tank, a secondary gravel filtration layer, a sump, and a fixed pump, which are sequentially arranged in the middle of the reserved fixed pump station platform in the middle of the open-pit stope; it also includes a mobile pump arranged at the bottom of the open-pit stope; the mobile pump is communicated with the primary sedimentation tank through a drainage pipeline.
[0007] Beneficial effects: By adding two sedimentation tanks in front of the sump of the fixed pump station, setting a certain reverse slope at the bottom of the sedimentation tank according to the flow direction of groundwater, and setting two gravel filtration layers between the primary sedimentation tank and the secondary sedimentation tank and between the secondary sedimentation tank and the sump, etc., the mud content of the groundwater finally pumped and drained by the fixed pump is greatly reduced to an acceptable range, avoiding damage failures to the fixed pump, extending the service life of the fixed pump, ensuring the safety and reliability of the drainage system of the fixed pump station, reducing the impact on the production operation at the bottom of the open-pit stope, and bringing high economic and social benefits to the enterprise. Description of the Drawings
[0008] Figure 1 Figure 1 It is a top view of the utility model;
[0009] Figure 2 It is a front view of the utility model;
[0010] Figure 3 It is a schematic diagram of the actual application of the utility model.
[0011] In the figure: 1, primary sedimentation tank; 2, secondary sedimentation tank; 3, sump; 4, fixed pump; 5, primary gravel filtration layer; 6, secondary gravel filtration layer; 7, mobile pump; 8, drainage pipeline; 9, drainage pipe support; 10, open-pit slope; 11, upper flood interception ditch. Detailed Embodiments
[0012] To make the purpose, content and advantages of the utility model clearer, the following further describes the detailed embodiments of the utility model in detail.
[0013] A stepped sedimentation drainage system for a fixed pumping station in an open-pit stope. A fixed pumping station platform is reserved in the middle of the mining depth of the open-pit stope. On the platform, a primary sedimentation tank 1, a primary gravel filtration layer 5, a secondary sedimentation tank 2, a secondary gravel filtration layer 6, a sump 3, and a fixed pump 4 are arranged in sequence. It also includes a mobile pump installed at the bottom of the open-pit stope. The mobile pump is connected to the primary sedimentation tank 1 through a drainage pipeline. The fixed pump 4 is connected to the upper flood interception ditch through a drainage pipe.
[0014] The drainage pipe is installed on the open-pit slope through a drainage pipe support.
[0015] Preferably, the bottom and walls of the primary sedimentation tank, secondary sedimentation tank, and sump are poured with concrete of C30 strength, and the pouring thickness is 20 cm to prevent the infiltration of groundwater in the tank.
[0016] Preferably, the specification parameters such as the length, width, and depth of the primary sedimentation tank, secondary sedimentation tank, and sump should be set larger according to the actual site conditions, so that the sediment can be precipitated as much as possible during the flow of groundwater in the tank.
[0017] Preferably, the reverse slope at the bottom of the two-stage sedimentation tank is set to 3% - 5%.
[0018] Preferably, the stacking height of the gravel filtration layer should reach the water surface height when the tank is full of water, and the width of the water passing section of the gravel filtration layer should not be less than 1.5 m. At the same time, the gravel particle size of the primary gravel filtration layer is 10 - 15 cm, and the mesh diameter of the peripheral wire mesh is in the range of 5 - 8 cm. The gravel particle size of the secondary gravel filtration layer is 5 - 10 cm, and the mesh diameter of the peripheral wire mesh is 1 - 4 cm, ensuring the filtration and sedimentation effect of sediment in the sewage.
[0019] Preferably, the slope angle α at the water inlet end of the primary sedimentation tank should be appropriately slowed down to meet the requirement for the excavator to enter the sedimentation tank for silt cleaning operations.
[0020] Preferably, the height of the water inlet end of the drainage pipe where the fixed pump extends into the sump should be set above the upper part of the tank, ensuring that it is at a position 0.4 - 0.6 m below the water surface height when the tank is full of water. The mesh diameter of the water inlet end filter screen is 0.6 - 1.0 cm.
[0021] Example:
[0022] The elevation of the closed circle of the stope where this utility model is applied is 1320 m, the elevation of the pit bottom is 1196 m, and the elevation where the fixed pumping station is set is 1256 m. There is a flood interception ditch above the elevation of the closed circle, and a mobile pump is installed at the pit bottom. After pumping the groundwater at the pit bottom to the fixed pumping station, it is then pumped out of the open-pit boundary by relay.
[0023] First, on the 1256m fixed pump station platform in the open-pit mine, three rectangular pools are excavated and concrete with a thickness of 20 cm (reinforcement mesh is laid inside) is poured to prevent groundwater seepage. At the same time, according to the actual situation on-site, the specification parameters such as the length, width, and depth of the pools are set as large as possible, so that the sediment can be precipitated as much as possible during the flow of groundwater in the pools.
[0024] A reverse slope of 4% is set at the bottom of the two-stage sedimentation tanks according to the flow direction of groundwater, so that the sediment carried in the sewage at the bottom layer of the pool can be precipitated at the bottom of the pool as much as possible.
[0025] Secondly, two gravel filter layers are set between the first-stage sedimentation tank and the second-stage sedimentation tank, and between the second-stage sedimentation tank and the collection tank to filter groundwater, so that the sediment can be precipitated in the previous sedimentation tank as much as possible. Among them, the first-stage gravel filter layer set between the first-stage sedimentation tank and the second-stage sedimentation tank consists of a gravel layer with a larger particle size (particle size of 10 - 15 cm), and the outside of the gravel layer is wrapped with a layer of wire mesh for fixation (mesh diameter of 5 - 8 cm). The second-stage gravel filter layer set between the second-stage sedimentation tank and the collection tank consists of a gravel layer with a smaller particle size (particle size of 5 - 10 cm), and the outside of the gravel layer is wrapped with a layer of wire mesh for fixation (mesh diameter of 1 - 4 cm) to prevent the gravel from being washed down by the water flow. At the same time, the wire mesh can play a role in filtering the water quality to a certain extent. The first-stage gravel filter layer and the second-stage gravel filter layer are stacked with gravel, and the stacking height should reach the water surface height when the pool is full of water, and its cross-sectional shape is approximately an isosceles trapezoid. At the same time, when the first-stage sedimentation tank is excavated, the slope angle α at the water inlet end is appropriately slowed down to 30°, meeting the requirements for the excavator to enter the sedimentation tank for silt cleaning operations.
[0026] Then, the height of the inlet end of the drain pipe where the fixed pump is inserted into the collection tank is set above the pool, ensuring that it is 0.4 - 0.6 m below the water surface height when the pool is full of water. A stainless steel filter screen with a mesh diameter of 0.6 - 1.0 cm is welded at the inlet end to prevent sediment or gravel from being sucked into the fixed pump during drainage, causing damage to the water pump.
[0027] Finally, the groundwater with a large amount of sediment at the bottom of the pit is pumped through the mobile pump at the bottom of the pit to the first-stage sedimentation tank through the drainage pipeline. The drainage pipeline is fixed on the open-pit slope by the drainage pipe support. The groundwater flows to the second-stage sedimentation tank after being filtered and precipitated by the first-stage gravel filter layer, and then flows to the collection tank after being filtered and precipitated by the second-stage gravel filter layer. Then, after the groundwater is filtered by the filter screen at the inlet end of the drain pipe where the fixed pump is inserted into the collection tank, it is pumped through the fixed pump and the drainage pipeline to the upper flood interception ditch and discharged outside the open-pit boundary.
[0028] Through the above technical measures, the mud content of the groundwater finally entering the fixed pump for pumping is greatly reduced to an acceptable range, avoiding damage and failure to the fixed pump, extending the service life of the fixed pump, and ensuring the safety and reliability of the drainage system of the fixed pump station.
[0029] The principle of the utility model is simple, with strong operability and practicability. It can solve problems such as large mud content in groundwater during the drainage process of traditional fixed pump stations, frequent damage faults of fixed pumps, and difficult dredging of pump pits. The utility model adds two sedimentation tanks in front of the sump of the fixed pump station, sets a certain reverse slope at the bottom of the sedimentation tank according to the flow direction of groundwater, and sets two gravel filter layers between the first sedimentation tank and the second sedimentation tank, and between the second sedimentation tank and the sump. Through these technical measures, the mud content of the groundwater finally pumped and drained by the fixed pump is greatly reduced to an acceptable range, avoiding damage to the fixed pump due to faults, extending the service life of the fixed pump, ensuring the safety and reliability of the drainage system of the fixed pump station, reducing the impact on the production operation at the bottom of the open-pit mine, and bringing high economic and social benefits to the enterprise.
[0030] The above are only the preferred embodiments of the utility model. It should be noted that for those of ordinary skill in the art of this technology, without departing from the technical principle of the utility model, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the utility model.
Claims
1. A graded sedimentation drainage system for a fixed pumping station in an open pit, characterized in that: It includes a primary sedimentation tank, a primary gravel filter layer, a secondary sedimentation tank, a secondary gravel filter layer, a water collection tank, and a fixed pump, which are sequentially arranged in the middle of a fixed pump station platform reserved in the middle of the open-pit mine; it also includes a mobile pump arranged at the bottom of the open-pit mine; the mobile pump is connected to the primary sedimentation tank through a drainage pipeline.
2. A hierarchical sedimentation and drainage system for a fixed pumping station in an open pit according to claim 1, characterized in that: The fixed pump is connected to the upper flood interception ditch through a drainage pipe.
3. A hierarchical sedimentation and drainage system for a fixed pumping station in an open pit according to claim 2, characterized in that: The drainage pipe is set on the open slope through a drainage pipe bracket.
4. The hierarchical sedimentation and drainage system for a fixed pumping station in an open pit according to claim 1, characterized in that: The bottom and walls of the primary sedimentation tank, secondary sedimentation tank and collection tank are poured with concrete.
5. The hierarchical sedimentation and drainage system for a fixed pumping station in an open pit according to claim 1, characterized in that: The bottom of the primary sedimentation tank and the secondary sedimentation tank is provided with a reverse slope.
6. A hierarchical sedimentation and drainage system for a fixed pumping station in an open pit according to claim 5, characterized in that: The reverse slope is set to 3% to 5%.
7. The hierarchical sedimentation and drainage system for a fixed pumping station in an open pit according to claim 1, characterized in that: The stacking height of the primary gravel filter layer and the secondary gravel filter layer should reach the water surface height when the pool is full of water, and the width of the water-passing section should not be less than 1.5m.
8. The hierarchical sedimentation and drainage system for a fixed pumping station in an open pit according to claim 1, characterized in that: The primary crushed stone filter layer is composed of a crushed stone layer with a particle size of 10 to 15 cm, and the mesh diameter of the gauze arranged on the periphery thereof is 5 to 8 cm.
9. The hierarchical sedimentation and drainage system for a fixed pumping station in an open pit according to claim 1, characterized in that: The secondary crushed stone filter layer is composed of a crushed stone layer with a particle size of 5 to 10 cm, and the mesh diameter of the gauze arranged on the periphery thereof is 1 to 4 cm.
10. The hierarchical sedimentation and drainage system for a fixed pumping station in an open pit according to claim 1, characterized in that: The water inlet height of the drainage pipe of the fixed pump extending into the water collection tank should be set at the upper part of the water collection tank to ensure that it is 0.4 to 0.6m below the water surface when the water collection tank is full of water. The mesh diameter of the filter screen installed at the water inlet end of the drainage pipe of the fixed pump extending into the water collection tank is 0.6 to 1.0cm.