Tailing pond spraying dust fall system and operation method thereof

Abstract

The invention discloses a tailing pond spraying dust fall system and an operation method thereof, and the tailing pond spraying dust fall system comprises a tailing pond which comprises a dry beach face at the top and a side dam slope; the tailing pond is provided with a gas drive well and a spraying device; the system further comprises an air compressor room, an air compressor and a variable-temperature plate are arranged in the air compressor room, the two ends of the variable-temperature plate are communicated with a sewage treatment device through pipelines, the gas-driven well is communicated with the input end of the sewage treatment device through a water outlet pipe, and the spraying device is communicated with the output end of the sewage treatment device. The water body can be guided into the sewage treatment device by utilizing the potential energy of the high-pressure water body discharged by the gas-driven well, and the sewage treatment device is driven by utilizing the pressure of the water body, so that an aeration fan in a conventional process is omitted, the oxygen dissolving efficiency of the water body can be improved, and the requirement of spraying and dust falling on the tailing pond for a long time in an arid region or an environment in shortage of water resources is met; and the tailing pond underground water is used as circulating spraying water, so that the dam break risk caused by rising of the infiltration line of the tailing pond is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of dust reduction in tailings ponds, and in particular is a tailings pond spray dust reduction system and an operation method thereof. Background Art

[0002] Tailings ponds are facilities used to store tailings and wastewater generated during mining. They are usually composed of a dam, a reservoir area, and a drainage system, and are used to centrally manage tailings. However, with the continuous advancement of mineral processing technology, tailings are being ground into smaller and smaller pieces. Once the wind blows, dust is easily generated in the tailings pond, causing harm to the surrounding environment and residents' health.

[0003] In the related art, the purpose of dust reduction is currently achieved by adding a spray dust reduction system to continuously spray the tailings pond; however, the spray dust reduction system consumes a large amount of water resources to produce water mist particles, which may aggravate the problem of water shortage in arid areas or when water resources are scarce; at the same time, if the spray dust reduction spray volume is large, long-term operation will cause the infiltration line of the tailings pond to rise, causing the risk of dam breach; in addition, the surface of the tailings in the tailings pond is often attached to a large amount of mineral processing agents, and the cost of treating the wastewater discharged after spraying is relatively high.

[0004] Therefore, there is an urgent need for a tailings pond spray dust reduction system and an operation method thereof to solve the above-mentioned technical problems. Summary of the invention

[0005] The object of the present invention is to provide a tailings pond spray dust reduction system and an operation method thereof, so as to solve at least one aspect of the problems and defects raised in the above-mentioned background technology.

[0006] Specifically, the first aspect of the present invention discloses a tailings pond spray dust reduction system, comprising:

[0007] A tailings pond, the tailings pond comprising a dry beach surface at the top and a side dam slope;

[0008] The tailings pond is provided with a gas drive well and a spray device;

[0009] It also includes an air compressor room, in which an air compressor and a temperature-changing plate are arranged;

[0010] The two ends of the temperature-changing plate are connected to a sewage treatment device through pipelines, the gas drive well is connected to the input end of the sewage treatment device through a water outlet pipe, and the spray device is connected to the output end of the sewage treatment device.

[0011] The tailings pond spray dust reduction system according to the present invention has at least the following beneficial effects:

[0012] The tailings pond spray dust reduction system of the present invention utilizes the potential energy of the high-pressure water body discharged from the gas drive well to introduce the water body into the sewage treatment device. The working pressure of the gas drive well is usually 0.8MPa. Even if part of the pressure is lost in the pipeline, it is still higher than the 0.1MPa-0.3MPa of the conventional aeration fan. The pressure of the water body is used to drive the sewage treatment device, so the aeration fan in the conventional process can be saved, which can effectively save energy and improve the dissolved oxygen efficiency of the water body. The water body is aerobic reacted in the sewage treatment device and then pumped into the air compressor room. Since the groundwater temperature of the tailings pond is relatively low, the water body can be pumped into the air compressor room. On the one hand, the air compressor room can be cooled down, and on the other hand, the temperature-changing plate in the air compressor room can be used to heat the water body, so that the temperature of the groundwater in the tailings pond is increased, which is conducive to the subsequent anaerobic reaction of the water body; after the water body undergoes aerobic and anaerobic reactions, a part of the water body is output to the spraying device to spray the tailings pond for dust reduction, and the remaining water body is used as production circulating water. Not only does it not need to consume a large amount of water resources, but it can also produce water, which can meet the long-term spraying and dust reduction of the tailings pond in arid areas or water-scarce environments, and prevent the dust of tailings from causing environmental pollution and personnel health problems;

[0013] The tailings pond spray dust reduction system of the present invention uses the groundwater of the tailings pond as circulating spray water, without adding other water sources, and can avoid the risk of dam break caused by the increase of the infiltration line of the tailings pond. When the tailings spray dust reduction is met, it is ensured that the tailings pond will not have the risk of dam break, thereby improving the spray dust reduction efficiency and the safety of the tailings pond;

[0014] In addition, the present invention can effectively remove residual organic mineral processing agents and heavy metal pollution in the tailings pond by continuously spraying the treated water body on the tailings pond, effectively improve the groundwater quality of the tailings pond, and prevent the groundwater in the tailings pond from diffusing and migrating into the surrounding soil or water bodies, thereby reducing the impact on the environment and the cost of wastewater treatment.

[0015] As a further solution of the present invention: the sewage treatment device includes an aeration tank, a primary sedimentation tank and a temporary storage tank which are sequentially connected to one side of the air compressor room and an anaerobic tank on the other side of the air compressor room.

[0016] As a further solution of the present invention: a water inlet pipe is provided on one side of the aeration tank, and the aeration tank is connected to the water outlet pipe of the gas drive well through the water inlet pipe.

[0017] Since the sewage treatment device includes an aeration tank, a primary sedimentation tank and a temporary storage tank which are sequentially connected on one side of the air compressor room and an anaerobic tank on the other side of the air compressor room, a water inlet pipe is provided on one side of the aeration tank, and the aeration tank is connected to the outlet pipe of the gas drive well through the water inlet pipe, so that the potential energy of the high-pressure fluid discharged from the gas drive well can be introduced into the aeration tank, without the need to use an aeration fan for driving, and the pressure in the pipeline is higher than the pressure of a conventional aeration fan, so the aeration tank can be raised to extend the time that the gas stays in the water body, and further improve the dissolved oxygen efficiency of the water body; after aerobic reaction, the water body enters the primary sedimentation tank for the first dosing treatment, and then enters the temporary storage tank, and the water body in the temporary storage tank is pumped into the temperature variable plate through the air compressor room, and the water body enters the anaerobic tank for anaerobic reaction after heating; a part of the water body after aerobic and anaerobic treatment is transported to the spraying device after the second dosing, and the tailings are sprayed to reduce dust, and the other part of the water body has very few pollutants after aerobic and anaerobic treatment, and can be directly discharged or used as circulating water after membrane separation. The groundwater of the tailings pond is introduced into the sewage treatment device for sewage treatment through gas drive wells, and the tailings are sprayed with the water to reduce dust. Part of the water can be used as circulating water, which effectively realizes the recycling of water resources. It is particularly suitable for spraying and dust reduction in tailings ponds with scarce water resources, reduces the pollution of the tailings pond to the surrounding environment, and is beneficial to the ecological environment and the health of surrounding residents.

[0018] As a further solution of the present invention: a stirring device is arranged in the aeration tank, and the stirring device includes an axis rod, and a plurality of supporting rods are arranged along the circumference of the axis rod. The axis rod is connected to the inner wall of the aeration tank through the plurality of supporting rods, and a vertebral body is rotatably arranged at the bottom of the axis rod, and a plurality of fan blades are arranged along the circumference of the vertebral body.

[0019] Since a stirring device is provided in the aeration tank, the stirring device includes an axis rod, a plurality of supporting rods are provided along the circumference of the axis rod, the axis rod is connected to the inner side wall of the aeration tank through the plurality of supporting rods, a vertebral body is rotatably provided at the bottom of the axis rod, and a plurality of fan blades are provided along the circumference of the vertebral body; the high-pressure fluid of the gas-driven well is introduced into the aeration tank, and the fan blades start to rotate and stir the water body under the impact of the high-pressure water flow, so as to form a high-pressure gas-liquid mixed fluid, and the bubbles in the high-pressure gas-liquid mixed fluid are broken into smaller bubbles under the continuous stirring and impact of the fan blades, so as to improve the dissolved oxygen efficiency of the water body; the stirring device utilizes the potential energy of the high-pressure water body discharged from the gas-driven well, and no additional power equipment is required to drive the fan blades to rotate, and the high-pressure water flow is not only used for aeration, but also drives the stirring device at the same time, so as to ensure the treatment effect of the water body in the entire aeration tank, and effectively save energy consumption and operation costs.

[0020] As a further solution of the present invention: a groove is arranged on the top of the vertebral body.

[0021] By setting a groove at the top of the cone, the high-pressure gas-liquid mixed fluid will flow toward the groove under the influence of the fluid viscosity and pressure gradient changes after passing through the cone at high speed, and form turbulence; it can effectively slow down the floating speed of the bubbles, increase the contact time between the bubbles and the water body, make the bubbles stay in the water body longer, and improve the efficiency of oxygen dissolving into the water body, thereby improving the sewage treatment effect of the sewage treatment device.

[0022] As a further solution of the present invention: a plurality of water inlet branch pipes are arranged circumferentially and downwardly inclined along the output end of the water inlet pipe, and the pipe openings of the plurality of water inlet branch pipes are flush with or lower than the upper surface of the activated sludge in the aeration tank.

[0023] By arranging a number of water inlet branches circumferentially and downwardly along the output end of the water inlet pipe, the pipe openings of the water inlet branches are flush with or lower than the upper surface of the activated sludge in the aeration tank. When the groundwater of the tailings pond is transported to the aeration tank through the gas drive well, the high-speed water flow will suck the activated sludge at the bottom of the aeration tank from the water inlet branch into the water inlet pipe by negative pressure, and discharge it from the output end of the water inlet pipe, so that the activated sludge surges to the upper part of the aeration tank with the water flow, and under the stirring of the stirring device, the activated sludge is more fully in contact with the water body, thereby improving the efficiency of the aerobic reaction and thus improving the sewage treatment effect.

[0024] As a further solution of the present invention: slow flow grooves are respectively arranged between the aeration tank, the primary sedimentation tank and the temporary storage tank, and sawtooth-shaped notches are respectively arranged at both ends of the slow flow grooves.

[0025] Since slow flow troughs are provided between the aeration tank, primary sedimentation tank and temporary storage tank, and serrated notches are provided at both ends of the slow flow troughs, the speed of water flow from one tank to another can be effectively slowed down. The serrated notches can avoid direct impact of water flow on the bottom or wall of the tank, ensure the stability of the water flow, and prevent the water flow from bringing sediments in the previous tank into the next tank, thereby ensuring the sewage treatment effect.

[0026] As a further solution of the present invention: a first reagent is arranged in the primary sedimentation tank, the first reagent is a mixture of calcium chloride and polyacrylamide, the addition ratio of calcium chloride to polyacrylamide is 6.5-7.5:3.5-2.5, and the reagent concentration is controlled at 200mg-400mg / L.

[0027] Since the first agent is arranged in the primary sedimentation tank, the first agent is a mixture of calcium chloride and polyacrylamide, the addition ratio of calcium chloride to polyacrylamide is 6.5-7.5:3.5-2.5, preferably the addition ratio of calcium chloride to polyacrylamide is 7:3, and the agent concentration in the water body is controlled at 200mg-400mg / L after adding the agent, which is adjusted according to the water quality. The first agent can react with organic matter and heavy metal ions in the sewage to form precipitates, and polyacrylamide has strong adsorption performance, which can adsorb tiny particles and suspended matter in the sewage, so that these particles are aggregated into larger floccules, which is more conducive to the sedimentation of organic matter and heavy metal ions, significantly reducing the turbidity of the water body and improving the quality of the treated water.

[0028] As a further solution of the present invention: a second agent is arranged in the anaerobic tank, the second agent has the same addition ratio as the first agent, and the agent concentration is controlled at 2g-4g / L.

[0029] Since a second agent is provided in the anaerobic tank, the second agent has the same addition ratio as the first agent, and the agent concentration is controlled at 2g-4g / L. Calcium chloride and polyacrylamide both have a good bonding effect on the tailings, which can promote the crusting of the tailings surface and prevent it from being blown away by the wind. The polyacrylamide crust has a higher hardness but a thinner thickness. Although the calcium chloride crust has a lower hardness, it has better permeability and a thicker crust. The combination of the two can achieve better crusting, thereby ensuring that tailings dust is reduced and dust reduction efficiency is improved.

[0030] As a further solution of the present invention: the sludge in the primary sedimentation tank is coated on the surface of the tailings.

[0031] Due to the terrain changes caused by the slope of the tailings pond, the closer to the dam slope in the wind field, the stronger the wind intensity. Therefore, the sludge in the primary sedimentation tank is applied to the surface of the tailings from the dam slope to the dry beach surface to achieve the best dust suppression effect. The sludge composition is similar to that of the tailings that form a shell after spraying on the dry beach surface, and a small amount of residual agent can continue to react with the surface tailings to form a crust. As the reaction time increases, the shell's resistance to wind erosion increases, and through continuous spraying of the tailings, the shell thickness of the tailings becomes larger and the strength becomes higher, which can effectively suppress the dust problem of the tailings pond from the source.

[0032] The second aspect of the present invention also discloses an operation method of a tailings pond spray dust reduction system, comprising the following steps:

[0033] S1, introducing the high-pressure water flow discharged from the gas drive well into the aeration tank, and after sufficient aeration and aerobic reaction, the water body flows into the primary sedimentation tank, and a mixture of calcium chloride and polyacrylamide is added for the first time;

[0034] S2, the clean water after the aerobic reaction is completed flows into the temporary storage tank, and the water in the temporary storage tank is pumped into the temperature-changing plate in the air compressor room for heating treatment;

[0035] S3, the heated water flows into the anaerobic tank for anaerobic treatment, a part of the water in the anaerobic tank is added with a mixture of calcium chloride and polyacrylamide for the second time and sprayed with tailings through the spraying device, and the other part of the water is used as circulating water;

[0036] S4. Apply the sludge produced in the primary sedimentation tank to the surface of the tailings.

[0037] According to the operation method of the tailings pond spray dust reduction system of the present invention, there is no need to use an aeration fan. By utilizing the high-pressure water flow of the air-driven well, the groundwater of the tailings pond can be fully aerated and reacted with aerobic and anaerobic reaction, so that organic matter and part of suspended matter in the water body can be effectively removed, thereby improving the cleanliness of the water body; and a part of the water body is used for dust reduction spraying of tailings in the tailings pond, while the other part of the water body is used as circulating water; not only is there no need to use a new water source, but a part of water can also be produced as circulating water, thereby greatly improving the energy utilization efficiency; at the same time, by coating the surface of the tailings with sludge containing similar components to the tailings, and continuously spraying the tailings, the tailings are crusted, and the dust of the tailings is suppressed from the source, thereby realizing the effective utilization of water resources and the efficient dust reduction of the tailings pond. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0039] Figure 1 It is a schematic diagram of the structure of an air drive well and a spray device of a tailings pond spray dust reduction system;

[0040] Figure 2 It is a schematic diagram of the structure of a sewage treatment device of a tailings pond spray dust reduction system;

[0041] Figure 3 for Figure 2 A schematic cross-sectional structure diagram of ;

[0042] Figure 4 It is a schematic diagram of the cross-sectional structure of an aeration tank and a stirring device of a tailings pond spray dust reduction system;

[0043] Figure 5 This is a schematic diagram of the structure of a stirring device for a tailings pond spray dust reduction system;

[0044] Figure 6 This is a schematic diagram of the structure of an aeration tank water inlet pipe and water inlet branch pipe of a tailings pond spray dust reduction system;

[0045] Figure 7 This is a schematic diagram of the slow flow chute structure of a tailings pond spray dust reduction system.

[0046] Reference numerals:

[0047] 1. Tailings pond; 101. Dry beach surface; 102. Dam slope; 2. Gas drive well; 3. Spraying device; 4. Air compressor room; 401. Temperature variable plate; 5. Sewage treatment device; 501. Aeration tank; 5011. Water inlet pipe; 5012. Water inlet branch pipe; 502. Primary sedimentation tank; 503. Temporary storage tank; 504. Anaerobic tank; 505. Slow flow trough; 5051. Notch; 6. Stirring device; 601. Shaft; 602. Support rod; 603. Cone; 6031. Groove; 604. Fan blade. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution of the present invention is further specifically described below by way of examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation of the present invention.

[0049] In addition, in the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the disclosed embodiments. However, it is apparent that one or more embodiments may be implemented without these specific details. In other cases, known structures and devices are embodied in a schematic manner to simplify the accompanying drawings.

[0050] like Figure 1-7 The embodiment of the present invention is shown as a tailings pond spray dust reduction system, comprising: a tailings pond 1, the tailings pond 1 comprising a dry beach surface 101 at the top and a side dam slope 102; the tailings pond 1 is provided with a gas drive well 2 and a spray device 3; it also includes an air compressor room 4, in which an air compressor and a temperature variable plate 401 are provided; both ends of the temperature variable plate 401 are connected to a sewage treatment device 5 through a pipeline, the gas drive well 2 is connected to the input end of the sewage treatment device 5 through a water outlet pipe, and the spray device 3 is connected to the output end of the sewage treatment device 5.

[0051] Specifically, the tailings pond spray dust reduction system of the present invention utilizes the potential energy of the high-pressure water discharged from the gas drive well 2 to introduce the water into the sewage treatment device 5. The working pressure of the gas drive well 2 is usually 0.8MPa. Even if part of the pressure is lost in the pipeline, it is still higher than the 0.1MPa-0.3MPa of the conventional aeration fan. The pressure of the water body is used to drive the sewage treatment device 5, so the aeration fan in the conventional process can be saved, which can effectively save energy and improve the dissolved oxygen efficiency of the water body. The water body undergoes aerobic reaction through the sewage treatment device 5 and is then pumped into the air compressor room 4. Due to the underground water temperature of the tailings pond, the water body is pumped into the air compressor room 4. The temperature is low, on the one hand, the air compressor room 4 can be cooled down, and on the other hand, the variable temperature plate 401 in the air compressor room is used to heat the water body, so that the temperature of the groundwater in the tailings pond is increased, which is conducive to the subsequent anaerobic reaction of the water body; after the water body undergoes aerobic and anaerobic reactions, a part of the water body is output to the spraying device 3 to spray the tailings pond for dust reduction, and the remaining water body is used as production circulating water, which not only does not need to consume a large amount of water resources, but also can produce water, meeting the long-term spraying and dust reduction of the tailings pond in arid areas or water shortage environments, and preventing the dust of tailings from causing environmental pollution and personnel health problems;

[0052] The tailings pond spray dust reduction system of the present invention uses the groundwater of the tailings pond as circulating spray water, without adding other water sources, and can avoid the risk of dam break caused by the increase of the infiltration line of the tailings pond. When the tailings spray dust reduction is met, it is ensured that the tailings pond will not have the risk of dam break, thereby improving the spray dust reduction efficiency and the safety of the tailings pond;

[0053] In addition, the present invention can effectively remove residual organic mineral processing agents and heavy metal pollution in the tailings pond by continuously spraying the treated water, effectively improve the groundwater quality of the tailings pond, and prevent the groundwater in the tailings pond from diffusing and migrating into the surrounding soil or water bodies, thereby reducing the impact on the environment.

[0054] like Figure 2 and Figure 3 As shown, the sewage treatment device 5 includes an aeration tank 501, a primary sedimentation tank 502 and a temporary storage tank 503 which are connected in sequence on one side of the air compressor room 4, and an anaerobic tank 504 on the other side of the air compressor room 4; an inlet pipe 5011 is provided on one side of the aeration tank 501, and the aeration tank 501 is connected to the outlet pipe of the gas drive well 2 through the inlet pipe 5011.

[0055] Specifically, since the sewage treatment device 5 includes an aeration tank 501, a primary sedimentation tank 502, and a temporary storage tank 503 which are sequentially connected to one side of the air compressor room 4, and an anaerobic tank 504 on the other side of the air compressor room 4, a water inlet pipe 5011 is provided on one side of the aeration tank 501, and the aeration tank 501 is connected to the water outlet pipe of the gas drive well 2 through the water inlet pipe 5011, the potential energy of the high-pressure fluid discharged from the gas drive well 2 can be introduced into the aeration tank 501, and there is no need to use an aeration fan for driving, and the pressure in the pipeline is higher than the pressure of a conventional aeration fan, so the aeration tank 501 can be raised to prolong the gas in the water. The time that the water stays in the body further improves the dissolved oxygen efficiency of the water body; after the aerobic reaction, the water body enters the primary sedimentation tank 502 for the first dosing treatment, and then enters the temporary storage tank 503. The water body of the temporary storage tank 503 is pumped into the temperature-changing plate 401 through the air compressor room 4. After the water body is heated, it enters the anaerobic tank 504 for anaerobic reaction; a part of the water body after aerobic and anaerobic treatment is transported to the spray device 3 after the second dosing to spray the tailings for dust reduction. The other part of the water body has very few pollutants after aerobic and anaerobic treatment, and can be directly discharged or used as circulating water after membrane separation. The groundwater of the tailings pond is introduced into the sewage treatment device 5 for sewage treatment by the gas drive well 2, and the tailings are sprayed for dust reduction, and part of the water body can be used as circulating water, which effectively realizes the recycling of water resources. It is particularly suitable for spraying and dust reduction of tailings ponds with scarce water resources, reducing the pollution of the tailings pond to the surrounding environment, which is beneficial to the ecological environment and the health of surrounding residents.

[0056] like Figure 4 and Figure 5 As shown, a stirring device 6 is provided in the aeration tank 501, and the stirring device 6 includes an axis rod 601, and a plurality of support rods 602 are arranged circumferentially along the axis rod 601. The axis rod 601 is connected to the inner wall of the aeration tank 501 through the plurality of support rods 602. A vertebral body 603 is rotatably provided at the bottom of the axis rod 601, and a plurality of fan blades 604 are arranged circumferentially along the vertebral body 603.

[0057] Specifically, since the aeration tank 501 is provided with a stirring device 6, the stirring device 6 includes a shaft 601, a plurality of support rods 602 are arranged along the circumference of the shaft 601, the shaft 601 is connected to the inner wall of the aeration tank 501 through the plurality of support rods 602, a vertebral body 603 is rotatably arranged at the bottom of the shaft 601, and a plurality of fan blades 604 are arranged along the circumference of the vertebral body 603; the high-pressure fluid of the gas drive well 2 is introduced into the aeration tank 501, and the fan blades 604 start to rotate and stir the water body under the impact of the high-pressure water flow to form a high-pressure gas-liquid mixed fluid, and the bubbles in the high-pressure gas-liquid mixed fluid are broken into smaller bubbles under the continuous stirring and impact of the fan blades 604, thereby improving the dissolved oxygen efficiency of the water body; the stirring device 6 utilizes the potential energy of the high-pressure water body discharged from the gas drive well 2, and no additional power equipment is required to drive the fan blades 604 to rotate. The high-pressure water flow is not only used for aeration, but also drives the stirring device 6 at the same time, thereby ensuring the treatment effect of the water body in the entire aeration tank 501, and effectively saving energy consumption and operating costs.

[0058] Furthermore, if Figure 5 As shown, a groove 6031 is provided at the top of the vertebral body 603 .

[0059] Specifically, by setting a groove 6031 at the top of the cone 603, after the high-pressure gas-liquid mixed fluid passes through the cone 603 at high speed, it will flow toward the groove 6031 under the influence of the change in fluid viscosity and pressure gradient, and form turbulence; it can effectively slow down the floating speed of the bubbles, increase the contact time between the bubbles and the water body, make the bubbles stay in the water body longer, and improve the efficiency of oxygen dissolving into the water body, thereby improving the sewage treatment effect of the sewage treatment device 5.

[0060] Furthermore, if Figure 6 As shown, a plurality of water inlet branch pipes 5012 are arranged circumferentially and downwardly inclined along the output end of the water inlet pipe 5011 , and the pipe openings of the plurality of water inlet branch pipes 5012 are flush with or lower than the upper surface of the activated sludge in the aeration tank 501 .

[0061] Specifically, a plurality of water inlet branch pipes 5012 are arranged circumferentially and downwardly along the output end of the water inlet pipe 5011, and the pipe openings of the plurality of water inlet branch pipes 5012 are flush with or lower than the upper surface of the activated sludge in the aeration tank 501. When the groundwater of the tailings pond is transported to the aeration tank 501 through the gas drive well 2, the high-speed water flow will suck the activated sludge at the bottom of the aeration tank from the water inlet branch pipe into the water inlet pipe by negative pressure, and discharge it from the output end of the water inlet pipe, so that the activated sludge surges to the upper part of the aeration tank 501 with the water flow, and under the stirring of the stirring device 6, the activated sludge is more fully in contact with the water body, thereby improving the efficiency of the aerobic reaction and thus improving the sewage treatment effect.

[0062] like Figure 2 and Figure 7As shown, slow flow grooves 505 are respectively arranged between the aeration tank 501 , the primary sedimentation tank 502 and the temporary storage tank 503 , and sawtooth-shaped notches 5051 are respectively arranged at both ends of the slow flow grooves 505 .

[0063] Specifically, since slow flow troughs 505 are respectively arranged between the aeration tank 501, the primary sedimentation tank 502 and the temporary storage tank 503, and serrated notches 5051 are respectively arranged at both ends of the slow flow trough 505, the speed of water flow from one tank to another can be effectively slowed down. The serrated notches 5051 can avoid direct impact of water flow on the bottom or wall of the tank, ensure the stability of the water flow, prevent the water flow from bringing sediments in the previous tank into the next tank, and ensure the sewage treatment effect.

[0064] According to an embodiment of the present invention, a first reagent is provided in the primary sedimentation tank 502. The first reagent is a mixture of calcium chloride and polyacrylamide. The addition ratio of calcium chloride to polyacrylamide is 6.5-7.5:3.5-2.5. The reagent concentration is controlled at 200mg-400mg / L.

[0065] Specifically, since the first agent is provided in the primary sedimentation tank 502, the first agent is a mixture of calcium chloride and polyacrylamide, the addition ratio of calcium chloride to polyacrylamide is 6.5-7.5:3.5-2.5, and the preferred addition ratio of calcium chloride to polyacrylamide is 7:3. After adding the agent, the agent concentration in the water body is controlled at 200mg-400mg / L, and is adjusted according to the water quality. The first agent can react with organic matter and heavy metal ions in the sewage to form precipitates, and polyacrylamide has strong adsorption properties, which can adsorb tiny particles and suspended matter in the sewage, so that these particles aggregate into larger flocs, which is more conducive to the sedimentation of organic matter and heavy metal ions, significantly reducing the turbidity of the water body and improving the quality of the treated water.

[0066] Furthermore, a second agent is provided in the anaerobic tank 504. The second agent has the same addition ratio as the first agent, and the agent concentration is controlled at 2g-4g / L.

[0067] Specifically, since a second agent is provided in the anaerobic tank, the second agent has the same addition ratio as the first agent, and the agent concentration is controlled at 2g-4g / L, calcium chloride and polyacrylamide both have a good bonding effect on the tailings, which can promote the crusting of the tailings surface and is not easily blown away by the wind. The polyacrylamide crust has a higher hardness but a thinner thickness, while the calcium chloride crust has a lower hardness but better permeability and a thicker crust. The combination of the two can achieve better crusting, thereby ensuring that tailings dust is reduced and dust reduction efficiency is improved.

[0068] It should also be noted that the sludge in the primary sedimentation tank 502 is coated on the surface of the tailings.

[0069] Specifically, due to the terrain change caused by the tailings pond dam slope 102, the closer to the dam slope 102 in the wind field, the stronger the wind force. Therefore, the sludge in the primary sedimentation tank 502 is applied to the surface of the tailings from the dam slope 102 toward the dry beach surface 101 to achieve the best dust suppression effect. The sludge composition is similar to the tailings composition that forms a shell after spraying the dry beach surface 101, and a small amount of reagent remains, which can continue to react with the surface tailings to form a crust. As the reaction time increases, the shell's wind erosion resistance increases, and by continuously spraying the tailings, the shell thickness of the tailings becomes larger and larger, and the strength becomes higher and higher, which can effectively suppress the dust problem of the tailings pond from the source.

[0070] The second aspect of the present invention also discloses an operation method of a tailings pond spray dust reduction system, comprising the following steps:

[0071] S1, the high-pressure water flow discharged from the gas drive well 2 is introduced into the aeration tank 501, and after sufficient aeration and aerobic reaction, the water body flows into the primary sedimentation tank 502, and a mixture of calcium chloride and polyacrylamide is added for the first time;

[0072] S2. After the aerobic reaction is completed, the clean water flows into the temporary storage tank 503, and the water in the temporary storage tank 503 is pumped into the temperature-changing plate 401 in the air compressor room 4 for heating treatment;

[0073] S3, the heated water flows into the anaerobic tank 504 for anaerobic treatment, a part of the water in the anaerobic tank 504 is added with a mixture of calcium chloride and polyacrylamide for the second time and sprayed with tailings through the spray device 3, and the other part of the water is used as circulating water;

[0074] S4. Apply the sludge generated in the primary sedimentation tank 502 to the surface of the tailings.

[0075] Specifically, through the operation method of the tailings pond spray dust reduction system of the present invention, there is no need to use an aeration fan. By utilizing the high-pressure water flow of the air drive well 2, the groundwater of the tailings pond can be fully aerated and reacted with aerobic and anaerobic reactions, so that organic matter and part of the suspended matter in the water body can be effectively removed, thereby improving the cleanliness of the water body; and a part of the water body is used for dust reduction spraying of tailings in the tailings pond, and the other part of the water body is used as circulating water; not only is there no need to use a new water source, but a part of the water can also be produced as circulating water, greatly improving energy utilization efficiency; at the same time, by coating the surface of the tailings with sludge containing similar components to the tailings, and continuously spraying the tailings, the tailings are crusted, and the dust of the tailings is suppressed from the source, thereby achieving effective utilization of water resources and efficient dust reduction in the tailings pond.

[0076] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tailings pond spray dust reduction system, characterized in that: include: A tailings pond (1), the tailings pond (1) comprising a top dry beach surface (101) and a side dam slope (102); The tailings pond (1) is provided with a gas drive well (2) and a spray device (3); It also includes an air compressor room (4), wherein an air compressor and a temperature-changing plate (401) are arranged in the air compressor room (4); The two ends of the temperature-changing plate (401) are connected to a sewage treatment device (5) through pipelines, the gas drive well (2) is connected to the input end of the sewage treatment device (5) through a water outlet pipe, and the spray device (3) is connected to the output end of the sewage treatment device (5).

2. The tailings pond spray dust reduction system according to claim 1, characterized in that: The sewage treatment device (5) comprises an aeration tank (501), a primary sedimentation tank (502) and a temporary storage tank (503) which are sequentially connected to one side of the air compressor room (4) and an anaerobic tank (504) on the other side of the air compressor room (4).

3. The tailings pond spray dust reduction system according to claim 2, characterized in that: A water inlet pipe (5011) is provided on one side of the aeration tank (501), and the aeration tank (501) is connected to the water outlet pipe of the gas drive well (2) through the water inlet pipe (5011).

4. The tailings pond spray dust reduction system according to claim 3, characterized in that: The aeration tank (501) is provided with a stirring device (6), the stirring device (6) comprising an axle (601), a plurality of support rods (602) are arranged along the circumference of the axle (601), the axle (601) is connected to the inner wall of the aeration tank (501) through the plurality of support rods (602), a vertebral body (603) is rotatably arranged at the bottom of the axle (601), and a plurality of fan blades (604) are arranged along the circumference of the vertebral body (603).

5. The tailings pond spray dust reduction system according to claim 4, characterized in that: The top of the vertebral body (603) is provided with a groove (6031).

6. The tailings pond spray dust reduction system according to claim 5, characterized in that: A plurality of water inlet branch pipes (5012) are arranged circumferentially and downwardly inclined along the output end of the water inlet pipe (5011), and the pipe openings of the plurality of water inlet branch pipes (5012) are flush with or lower than the upper surface of the activated sludge in the aeration tank (501).

7. The tailings pond spray dust reduction system according to claim 2, characterized in that: Slow flow grooves (505) are respectively arranged between the aeration tank (501), the primary sedimentation tank (502) and the temporary storage tank (503), and sawtooth-shaped notches (5051) are respectively arranged at both ends of the slow flow grooves (505).

8. The tailings pond spray dust reduction system according to claim 2, characterized in that: The primary sedimentation tank (502) is provided with a first reagent, which is a mixture of calcium chloride and polyacrylamide. The addition ratio of calcium chloride to polyacrylamide is 6.5-7.5:3.5-2.5, and the reagent concentration is controlled at 200mg-400mg / L.

9. The tailings pond spray dust reduction system according to claim 8, characterized in that: The anaerobic tank (504) is provided with a second agent, the second agent has the same addition ratio as the first agent, and the agent concentration is controlled at 2g-4g / L.

10. An operating method of the tailings pond spray dust reduction system as claimed in claims 1 to 9, characterized in that: The steps include: S1, introducing the high-pressure water flow discharged from the gas drive well (2) into the aeration tank (501), and after sufficient aeration and aerobic reaction, the water body flows into the primary sedimentation tank (502), and a mixture of calcium chloride and polyacrylamide is added for the first time; S2, the clean water after the aerobic reaction is completed flows into the temporary storage tank (503), and the water in the temporary storage tank (503) is pumped into the temperature-changing plate (401) in the air compressor room (4) for heating treatment; S3, the heated water flows into the anaerobic tank (504) for anaerobic treatment, a part of the water in the anaerobic tank (504) is added with a mixture of calcium chloride and polyacrylamide for a second time and sprayed on the tailings through the spraying device (3), and the other part of the water is used as circulating water; S4. Apply the sludge generated in the primary sedimentation tank (502) to the surface of the tailings.

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