Leaching agent conveying system for salt lake mining area and water-saving and energy-saving salt mine development system and method

Abstract

The invention belongs to the technical field of salt lake resource development, and discloses a leaching agent conveying system for a salt lake mining area and a water-saving and energy-saving salt mine development system and method.In the leaching agent conveying system, a water source pump station is communicated with a fresh water filter through a pipeline so as to filter a water source provided by the water source pump station; the fresh water filter is communicated with a leaching solution preparation station through a pipeline, and the leaching solution preparation station is used for preparing or preparing a leaching agent required by solid-liquid conversion of salt lake mineral products; the leaching solution preparation station is connected to a salt mine filter through a communicating pipeline, the salt mine filter is used for filtering undissolved salt mine in a leaching agent, and a pump station is further arranged on the communicating pipeline; the salt mine filter is communicated with the main pipeline through a conveying pipeline, the main pipeline is connected with a plurality of branch pipelines used for conveying a leaching agent, the branch pipelines are buried in the ore dissolving target area, and each branch pipeline is provided with a plurality of small holes for the leaching agent to flow out. According to the method, the leaching agent is accurately input, the retention time is prolonged, and the solid-liquid conversion efficiency is efficiently improved.

Description

Technical Field

[0001] This invention relates to the field of salt lake resource development technology, and in particular to a solvent delivery system, a water-saving and energy-saving salt mine development system and method for salt lake mining areas. Background Technology

[0002] Low-grade solid minerals in salt lake areas are an important reserve resource for my country after the development of high-grade and easily exploitable minerals. For example, potash is an important resource related to my country's food security. Currently, in the development of low-grade solid minerals, "solid-liquid conversion" technology is the most important, core, and direct technology, based on the actual situation.

[0003] Salt lake areas are located in extremely water-scarce regions, such as arid or desert areas, with scarce rainfall, huge evaporation rates, and extremely fragile ecosystems. To develop and utilize low-grade mineral resources in salt lakes, the "solid-liquid conversion" method is typically used. This method involves introducing the leaching agent required for solid-liquid conversion into a large-area deposit area. The leaching agent then dissolves the effective ions in the low-grade solid ore layer, transferring these effective ions from the solid phase into the liquid phase. The liquid phase is then harvested for subsequent processing to obtain the target product.

[0004] Existing solid-liquid conversion processes primarily employ a "flood irrigation + surface runoff" approach, which suffers from problems such as extensive operation, poor adaptability, and significant resource waste. (1) Extreme waste of water resources: The annual precipitation in the salt lake area is only about 20-50 mm, while the evaporation is about 3000 mm. Traditional flood irrigation requires covering the surface of the mineral layer with leaching liquid (saturated brine). About 70% of the leaching liquid is lost due to evaporation or through salt dissolution fissures (also known as "dominant channels"), and the water resource utilization rate is only about 30%.

[0005] (2) High energy consumption and high cost: In order to maintain the flood irrigation level, a high-power salt-resistant pump set is required to continuously replenish water. The energy consumption per unit ore (calculated as KCl) is high, and the lost leaching solution needs to be re-converted and transported, which increases the energy consumption by about 30%-40%.

[0006] (3) Low solid-liquid conversion efficiency: The leaching solution stays in the ore layer for only about 2 hours. The concentration fluctuates greatly due to evaporation. The effective ion dissolution rate of the ore layer is very low. Some ore layers form "false dissolution layers" due to salt crust caking, and subsequent leaching solutions cannot penetrate, resulting in ore utilization rate of less than 30%.

[0007] By developing water-saving, energy-saving, and highly efficient technologies to improve solid-liquid conversion efficiency, we can not only directly alleviate the pressure of freshwater shortage in salt lake areas and reduce dependence on and exploitation of limited freshwater resources in the region, but also significantly improve the utilization efficiency of freshwater resources during the development of salt lake resources, save energy, and improve solid-liquid conversion efficiency. This is of great strategic significance for realizing the scientific, rational, green, and sustainable development of freshwater resources and low-grade solid-liquid mineral resources in my country's salt lake areas. Summary of the Invention

[0008] The purpose of this invention is to address the problems of extensive operation, poor adaptability, and serious resource waste in the existing "flood irrigation + surface runoff" method, and to provide a solvent delivery system for salt lake mining areas.

[0009] Another object of the present invention is to provide a salt mine development system based on the said solvent delivery system.

[0010] Another object of the present invention is to provide a salt mine development method based on the salt mine development system.

[0011] The technical solution adopted to achieve the purpose of this invention is: A solvent delivery system for salt lake mining areas includes a water source pumping station, a freshwater filter, a solvent preparation station, a salt mine filter, a main pipeline, and branch pipelines, wherein: The water source pumping station is connected to the freshwater filter through a pipeline to filter the water source provided by the water source pumping station; The freshwater filter is connected to the leaching solution preparation station via a pipeline. The leaching solution preparation station is used to prepare or manufacture the leaching agent required for solid-liquid conversion of salt lake minerals. The leaching solution preparation station is connected to the salt mine filter via a connecting pipeline. The salt mine filter is used to filter undissolved salt in the leaching agent. A pump station is also provided on the connecting pipeline. The salt mine filter is connected to the main pipeline via a delivery pipeline. The main pipeline is connected to multiple branch pipelines for conveying leaching agents. The branch pipelines are buried in the leaching target area, and each branch pipeline has multiple small holes for the leaching agent to flow out.

[0012] In the above technical solution, the branch pipes used to transport the leaching agent are placed in the ore layer 0.1-0.5m below the surface of the ore target area.

[0013] In the above technical solution, each small hole is equipped with a dripper or nozzle that resists salt crystallization.

[0014] In the above technical solution, the branch pipe is a circular pipe, and the small holes are arranged in a spiral pattern on the branch pipe 6.

[0015] In the above technical solution, the branch pipes are arranged in a matrix, and the branch pipes are straight pipes, "S"-shaped pipes, or "vortex"-shaped pipes.

[0016] In the above technical solution, when the crack spacing is ≥0.8m, the hole spacing is 0.8-1.2m; when the crack spacing is <0.8m, the hole spacing is 0.5-0.8m.

[0017] In the above technical solution, the salt mine filter is connected to the main pipeline through two parallel first and second pipelines. The freshwater filter is connected to the first connection point on the first pipeline through a flushing pipeline. A first connecting pipeline is provided between the flushing pipeline and the connecting pipeline. A first valve is provided on the first connecting pipeline. A second valve is provided on the pipeline between the first connection point and the salt mine filter. The first pipeline is connected to the second connection point and the third connection point of the second pipeline through a second connecting pipeline and a third connecting pipeline, respectively. A pressure controller is provided on the pipeline between the salt mine filter and the second connection point. A control valve is provided on the second pipeline between the second connection point and the third connection point. A third valve and a fourth valve are provided on the second connecting pipeline and the third connecting pipeline, respectively.

[0018] Another aspect of the present invention includes a salt mine development system, comprising the aforementioned solvent delivery system, brine wells, brine diversion channels, and salt fields, wherein the brine wells are located downstream of the groundwater flow direction in the leaching target area and are used to extract the leaching solution; the brine wells are arranged around and connected to the brine diversion channels, the brine diversion channels transport the leaching solution to the salt fields, and the salt fields are used to evaporate and concentrate the leaching solution to produce salt mines.

[0019] Another aspect of the present invention includes a method for salt mine development, comprising the following steps: Leaching: The leaching agent is prepared at the leaching solution preparation station. The water source pump station provides the water for preparing the leaching agent. The pump station and control valves are turned on, and the other valves are closed. After being filtered by the salt mine filter, the leaching agent enters the branch pipeline through the main pipeline, and then enters the leaching target area evenly through small holes for solid-liquid conversion. Extraction of solution: After confirming the direction of groundwater flow through exploration, brine wells and brine ditches are set up downstream of the groundwater flow direction. The brine wells and brine ditches work together to extract the solution formed after solid-liquid conversion. Evaporation and Concentration: The extracted solution is introduced into the salt field for evaporation and concentration to produce salt ore; When the leaching agent delivery pipeline becomes clogged, open the corresponding freshwater valve to clear the blockage. If the control valve becomes clogged, open the third and fourth valves to clear the blockage. If the main pipeline and branch pipelines become clogged, open the fourth valve to clear the blockage. If the pressure controller becomes clogged, open the second and third valves to clear the blockage. If the pump station becomes clogged, open the first and second valves to clear the blockage. If the location of the blockage is unclear, open the first, second, third, and fourth valves to clear the blockage. During the clearing process, the pump station, pressure controller, and control valves are all open.

[0020] In the above technical solution, the surface of the ore-dissolving target area is covered with an anti-evaporation membrane.

[0021] Compared with the prior art, the beneficial effects of the present invention are: This invention proposes a method for water-saving, energy-saving, and highly efficient solid-liquid conversion in salt lake areas. This technology integrates core technologies such as drip irrigation / slow spraying / scattering for delivering leaching solutions. By extending the leaching time and precisely leaching the mining area, it proactively reduces freshwater and energy consumption. This not only significantly alleviates the pressure on freshwater and energy resources in salt lake development areas and reduces production and operating costs, but more importantly, through the innovative model of precisely inputting leaching agents, extending the residence time of leaching agents, and efficiently improving solid-liquid conversion, it provides a practical and feasible technical path for the green, low-carbon transformation and sustainable development of the salt lake industry. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the solvent delivery system and development system of the present invention.

[0023] Figure 2 This is a schematic diagram of the leaching agent entering the ore-dissolving target area from the branch pipe.

[0024] In the diagram: 1-Water source pumping station, 2-Fresh water filter, 3-Leaching solution preparation station, 4-Salt mine filter, 5-Main pipeline, 6-Branch pipeline, 7-Connecting pipeline, 8-Pumping station, 9-Leaching target area, 10-Small hole, 11-First pipeline, 12-Second pipeline, 13-First connecting pipeline, 14-First valve, 15-Second valve, 16-Second connecting pipeline, 17-Third connecting pipeline, 18-Pressure controller, 19-Control valve, 20-Third valve, 21-Fourth valve, 22-Brine well, 23-Brine canal, 24-Salt field, 25-Flushing pipeline. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0026] Example 1 like Figure 1-2 As shown, a solvent delivery system for a salt lake mining area includes a water source pumping station 1, a freshwater filter 2, a solvent preparation station 3, a salt mine filter 4, a main pipeline 5, and branch pipelines 6, wherein: The water source pumping station 1 is connected to the freshwater filter 2 through a pipeline to filter the water source provided by the water source pumping station 1; The freshwater filter 2 is connected to the leaching solution preparation station 3 via a pipeline. The leaching solution preparation station 3 is used to prepare or manufacture the leaching agent required for solid-liquid conversion of salt lake minerals. The leaching solution preparation station 3 is connected to the salt mine filter 4 via a connecting pipeline 7. The salt mine filter 4 is used to filter undissolved salt mine in the leaching agent. A pump station 8 is also provided on the connecting pipeline 7. The salt mine filter 4 is connected to the main pipeline 5 via a delivery pipeline. Multiple branch pipelines 6 for conveying the leaching agent are connected to the main pipeline 5. These branch pipelines 6 are embedded in the leaching target area 9, and each branch pipeline 6 has multiple small holes 10 for the leaching agent to flow out. The leaching agent in the branch pipelines 6 contacts the ore layer through the pre-drilled holes 10 in a drip / slow spray / spraying manner, which can significantly improve the leaching efficiency and reduce the evaporation efficiency of the leaching solution.

[0027] Preferably, the branch pipe 6 for conveying the leaching agent is placed 0.1-0.5m below the surface of the ore layer in the ore-dissolving target area 9 to avoid rapid evaporation at the surface and reduce crack erosion.

[0028] Preferably, each small hole 10 is equipped with a dripper or nozzle that resists salt crystallization.

[0029] Preferably, the branch pipe 6 is a circular pipe, and the small holes 10 are arranged in a spiral pattern on the branch pipe 6, so that they can enter the ore-dissolving target area 9 from different directions of the branch pipe 6, thereby further improving the ore-dissolving efficiency.

[0030] Preferably, the branch pipes 6 are arranged in a matrix, and the branch pipes 6 are straight pipes, "S"-shaped pipes or "vortex"-shaped pipes. The "S"-shaped or "vortex"-shaped salt field 24 has a gravity flow water route, which is convenient for setting up a freshwater recovery device.

[0031] Preferably, when the crack spacing is ≥0.8m, the spacing of the small holes 10 is 0.8-1.2m; when the crack spacing is <0.8m, the spacing of the small holes 10 is 0.5-0.8m.

[0032] Preferably, the salt mine filter 4 is connected to the main pipeline 5 via two parallel first pipelines 11 and second pipelines 12. The freshwater filter 2 is connected to the first connection point on the first pipeline 11 via a flushing pipeline 25. A first connecting pipeline 13 is provided between the flushing pipeline 25 and the connecting pipeline 7. A first valve 14 is provided on the first connecting pipeline 13. A second valve 15 is provided on the pipeline between the first connection point and the salt mine filter 4. The first pipeline 11 is connected to the second connection point and the third connection point of the second pipeline 12 via a second connecting pipeline 16 and a third connecting pipeline 17, respectively. A pressure controller 18 is provided on the pipeline between the salt mine filter 4 and the second connection point. A control valve 19 is provided on the second pipeline 12 between the second connection point and the third connection point. A third valve 20 and a fourth valve 21 are provided on the second connecting pipeline 16 and the third connecting pipeline 17, respectively.

[0033] In the diagram, valves 14 (first valve), 15 (second valve), 20 (third valve), and 21 (fourth valve) are all freshwater pipe valves. Normally, when the leaching agent delivery pipeline is not clogged, all four freshwater pipe valves are closed, but they need to be opened periodically for cleaning. When the leaching agent delivery pipeline is clogged, the four freshwater pipe valves should be selectively opened immediately according to the location of the clog. In short, the function of the four freshwater pipe valves is to prevent clogging of the leaching agent delivery pipeline; they should be opened as needed, except for periodic opening.

[0034] The system pressure is stabilized within a certain range (e.g., 0.1-0.15 MPa) by pressure controller 18. The specific pressure should be determined according to the actual conditions of the deposit. Generally, it is set to low pressure because the salt lake ore layer is loose, and low pressure can reduce the loss of solvent caused by fracture expansion.

[0035] Example 2 like Figure 1 As shown, a salt mine development system includes the leaching agent delivery system described in Example 1, a brine well 22, a brine extraction channel 23, and a salt field 24. The brine well 22 is located downstream of the groundwater flow direction in the leaching target area 9 and is used to extract the leaching solution. The brine well 22 is arranged around and connected to the brine extraction channel 23. The brine extraction channel 23 transports the leaching solution to the salt field 24, which is used to evaporate and concentrate the leaching solution to produce salt.

[0036] Example 3 A method for developing salt mines includes the following steps: Leaching: The leaching agent is prepared by the leaching solution preparation station 3. The water source pump station 1 provides the water source (generally fresh water) for preparing the leaching agent. The pump station 8 and control valve 19 are turned on, and the other valves are closed. After being filtered by the salt mine filter 4, the leaching agent enters the branch pipe 6 through the main pipe 5, and then enters the leaching target area 9 evenly through the small hole 10 for solid-liquid conversion. Extraction of solution: After confirming the direction of groundwater flow through exploration, brine well 22 and brine canal 23 are set up downstream of the direction of groundwater flow. The brine well 22 and brine canal 23 work together to extract the solution formed after solid-liquid conversion. Evaporation and concentration: The extracted solution enters the salt field 24 for evaporation and concentration to produce salt ore.

[0037] When the leaching agent delivery pipeline becomes clogged, open the corresponding fresh water valve to clear the blockage. For example, if control valve 19 is clogged, open the third valve 20 and the fourth valve 21 to promptly introduce fresh water into the pipeline where control valve 19 is located, and clean the clogged area as soon as possible to prevent complete blockage. When the third valve 20 is opened, pump station 8 and control valve 19 remain open to prevent blockage caused by closure.

[0038] When the main pipeline 5 and branch pipeline 6 become clogged, open the fourth valve 21 to clear the blockage; when the pressure controller 18 becomes clogged, open the second valve 15 and the third valve 20 to clear the blockage; when the pump station 8 becomes clogged, open the first valve 14 and the second valve 15 to clear the blockage. When the control valve 19, pressure controller 18, or pump station 8 becomes clogged, the flow velocity in the downstream pipeline decreases, and the leaching agent is prone to crystallization, creating new blockage points. Therefore, when the control valve 19 becomes clogged, the fourth valve 21 downstream of it needs to be opened; when the pressure controller 18 becomes clogged, the third valve 20 downstream of it needs to be opened; and when the pump station 8 becomes clogged, the second valve 15 downstream of it needs to be opened to ensure that the upstream and downstream of the blockage location are unobstructed.

[0039] When the location of the blockage is unclear, open the first valve 14, the second valve 15, the third valve 20, and the fourth valve 21 to clear the blockage.

[0040] Preferably, the surface of the leaching target area is covered with an anti-evaporation membrane to further reduce the evaporation efficiency of the leaching agent.

[0041] The above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A solvent delivery system for salt lake mining areas, characterized in that, This includes a water source pumping station, a freshwater filter, a leaching solution preparation station, a salt mine filter, main pipelines, and branch pipelines, among which: The water source pumping station is connected to the freshwater filter through a pipeline to filter the water source provided by the water source pumping station; The freshwater filter is connected to the leaching solution preparation station via a pipeline. The leaching solution preparation station is used to prepare or manufacture the leaching agent required for solid-liquid conversion of salt lake minerals. The leaching solution preparation station is connected to the salt mine filter via a connecting pipeline. The salt mine filter is used to filter undissolved salt in the leaching agent. A pump station is also provided on the connecting pipeline. The salt mine filter is connected to the main pipeline via a delivery pipeline. The main pipeline is connected to multiple branch pipelines for conveying leaching agents. The branch pipelines are buried in the leaching target area, and each branch pipeline has multiple small holes for the leaching agent to flow out.

2. The solvent delivery system as described in claim 1, characterized in that, Branch pipelines used for transporting leaching agents are placed within the ore layer 0.1-0.5m below the surface of the ore target area.

3. The solvent delivery system as described in claim 1, characterized in that, Each small hole is fitted with a dripper or nozzle that resists salt crystallization.

4. The solvent delivery system as described in claim 1, characterized in that, The branch pipe is a round pipe, and the small holes are arranged in a spiral pattern on the branch pipe 6.

5. The solvent delivery system as described in claim 1, characterized in that, The branch pipes are arranged in a matrix, and the branch pipes are straight pipes, "S" shaped pipes, or "vortex" shaped pipes.

6. The solvent delivery system as described in claim 1, characterized in that, When the crack spacing is ≥0.8m, the hole spacing is 0.8-1.2m; when the crack spacing is <0.8m, the hole spacing is 0.5-0.8m.

7. The solvent delivery system as described in claim 1, characterized in that, The salt mine filter is connected to the main pipeline via two parallel first and second pipelines. The freshwater filter is connected to a first connection point on the first pipeline via a flushing pipeline. A first connecting pipeline is provided between the flushing pipeline and the connecting pipeline. A first valve is provided on the first connecting pipeline. A second valve is provided on the pipeline between the first connection point and the salt mine filter. The first pipeline is connected to the second connection point and the third connection point of the second pipeline via a second connecting pipeline and a third connecting pipeline, respectively. A pressure controller is provided on the pipeline between the salt mine filter and the second connection point. A control valve is provided on the second pipeline between the second connection point and the third connection point. A third valve and a fourth valve are provided on the second connecting pipeline and the third connecting pipeline, respectively.

8. A salt mine development system, characterized in that, The system includes a leaching agent delivery system, a brine well, a brine canal, and a salt field as described in any one of claims 1-7, wherein the brine well is located downstream of the groundwater flow direction in the leaching target area and is used to extract the leaching solution; the brine well is arranged around and connected to the brine canal, the brine canal transports the leaching solution to the salt field, and the salt field is used to evaporate and concentrate the leaching solution to produce salt ore.

9. A salt mine development method based on the salt mine development system as described in claim 8, characterized in that, Includes the following steps: Leaching: The leaching agent is prepared at the leaching solution preparation station. The water source pump station provides the water for preparing the leaching agent. The pump station and control valves are turned on, and the other valves are closed. After being filtered by the salt mine filter, the leaching agent enters the branch pipeline through the main pipeline, and then enters the leaching target area evenly through small holes for solid-liquid conversion. Extraction of solution: After confirming the direction of groundwater flow through exploration, brine wells and brine ditches are set up downstream of the groundwater flow direction. The brine wells and brine ditches work together to extract the solution formed after solid-liquid conversion. Evaporation and Concentration: The extracted solution is introduced into the salt field for evaporation and concentration to produce salt ore; When the leaching agent delivery pipeline becomes clogged, open the corresponding freshwater valve to clear the blockage. If the control valve becomes clogged, open the third and fourth valves to clear the blockage. If the main pipeline and branch pipelines become clogged, open the fourth valve to clear the blockage. If the pressure controller becomes clogged, open the second and third valves to clear the blockage. If the pump station becomes clogged, open the first and second valves to clear the blockage. If the location of the blockage is unclear, open the first, second, third, and fourth valves to clear the blockage. During the clearing process, the pump station, pressure controller, and control valves are all open.

10. The salt mine development method as described in claim 9, characterized in that, The surface of the ore-dissolving target area is covered with an anti-evaporation membrane.

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