Gravity and vacuum combined draining device of wet tailing storage silo

Abstract

The utility model discloses a gravity vacuum combined draining device of a silo for storing wet tailings, which comprises a barrel body, a buffer tank and a jet flow vacuum suite, the lower end of the barrel body is an inverted cone bottom, a plurality of vacuum sleeves are arranged on the inverted cone bottom in a vertical plane, a square water avoiding frame is arranged at the bottom of the inverted cone bottom, and the vacuum sleeves are arranged in the square water avoiding frame. The vacuum sleeve is connected with a buffer tank through a vacuum pipeline connector arranged at the bottom; the buffer tank comprises an air inlet main pipeline, an air outlet pipe, a pressure gauge and a tank body; the buffer tank is connected with the jet vacuum suite through the air outlet pipe, and the jet vacuum suite comprises an air inlet, a jet pipe, an air outlet, a water pump, a flow stabilizing box outlet, a water outlet, a flow stabilizing box, a liquid level control plate and a defoaming box. According to the utility model, the gravity and vacuum combined draining technology is adopted to reduce the moisture of the fine-grain tailings within 24 hours, so that the fine-grain tailings can be normally produced, stored and sold, and the problems that the moisture content of the existing fine-grain tailings is too high, so that the fine-grain tailings are thrown and leaked along the way during automobile transportation and sales, and the environmental protection is not up to the standard are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of mineral processing engineering, in particular to a gravity vacuum combined drainage device for storing wet tailings silos. Background Art

[0002] In recent years, the construction of tailing-free mines has been promoted more and more vigorously. Separating qualified tailings that can meet the standards of sand and gravel aggregates from tailings and selling them as sand and gravel aggregates has become the most effective way to reduce tailings discharge and save tailings treatment costs, and has been widely used. With the continuous expansion of applications, the particle size of tailings products that can be separated and utilized is getting finer and finer. As a result, the high moisture content of fine tailings leads to spillage and dripping along the way of automobile transportation sales, resulting in environmental protection failures, which eventually become a problem affecting the entry of this part of fine-grained tailings into the market. At present, the storage and loading and shipping process of fine sand production is mostly: on-site stacking-shovel loader loading-truck transportation mode. There are problems such as water flowing around the on-site stacking sand pile, material spilling during the loading process of the shovel loader, and material falling after loading beyond the side of the car. As a result, the storage environment is very poor, and it is difficult to solve the problems of mud and mortar flowing freely on rainy days and dust blowing in the wind on sunny days.

[0003] In view of the problems in the related technologies, the high moisture content of fine-grained tailings affects normal production, storage, transportation and sales. At present, there is no relevant patent technology that shows that the moisture content of wet sand in a full warehouse of fine-grained grade (-200 mesh grade content ≥50%, and -325 mesh grade content ≥20%) can be reduced to below 12% within 2 days to ensure that it will not be spilled or leaked during loading and transportation. Therefore, there is an urgent need for dehydration treatment technology that matches the storage, loading and transportation of fine-grained wet tailings, and it is very necessary to develop a gravity vacuum combined drainage device for storing wet tailings silos. Utility Model Content

[0004] The purpose of the utility model is to provide a gravity-vacuum combined drainage device for storing wet tailings silos, which adopts gravity + vacuum combined drainage technology to reduce the moisture content of fine tailings within 24 hours, ensure that the fine tailings can be produced, stored and sold normally, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the utility model provides the following technical solution: A gravity vacuum combined water drainage device for a wet tailings silo, comprising a cylinder body, a buffer tank and a jet vacuum kit. The upper end of the cylinder body is a dome, and a feed inlet is provided at the center of the dome. The lower end of the cylinder body is an inverted cone bottom, and a plurality of vacuum sleeves are arranged vertically and horizontally on the inverted cone bottom. A square water avoidance frame is also provided at the bottom of the inverted cone bottom, and the empty space inside the square water avoidance frame is a discharge port. The vacuum sleeve is connected to the buffer tank through a vacuum pipeline connection port provided at the bottom. The buffer tank includes an air inlet main pipeline, an air outlet pipe, a pressure gauge and a tank body. The buffer tank is connected to the jet vacuum kit through the air outlet pipe. The jet vacuum kit includes an air inlet, a jet pipe, an air outlet, a water pump, a steady flow box outlet, a drain port, a steady flow box, a liquid level control board and an anti-foam box. The front end of the air inlet is connected to the water pump and the air outlet pipe, the rear end of the air inlet is connected to the jet pipe, the rear end of the jet pipe is connected to the air outlet, the rear end of the air outlet is connected to the anti-foam box, the anti-foam box is connected in parallel with the steady flow box, and they are isolated by the liquid level control board in the middle. The space above the top of the liquid level control board is connected and communicated. The top of the anti-foam box is connected to the drain port, the lower part of the steady flow box is connected to the steady flow box outlet, and the rear end of the steady flow box outlet is connected to the water pump.

[0006] Further, the feed inlet, the dome and the inverted cone bottom form a vertical three-dimensional space structure from top to bottom inside the cylinder body.

[0007] Further, four layers of water permeable devices are arranged from outside to inside in the vacuum sleeve, which are the first layer of metal mesh, the second layer of round hole steel pipe, the third layer of filter cloth and the fourth layer of strip hole steel pipe. A flange connected to the inverted cone bottom is provided at the lower part of the vacuum sleeve.

[0008] Further, the height of the water permeable device above the flange is 1000mm, and the length of the vacuum pipeline connection port below the flange is set according to the connection requirement.

[0009] Further, the metal mesh in the water permeable device is an 80-mesh stainless steel mesh; the round hole steel pipe is a steel pipe with a diameter of φ100mm, and the pipe wall is fully opened with round holes of φ5mm, and the interval between the round holes is 2.5mm; the filter cloth is non-woven fabric with a specification of 200g / ㎡; the strip hole steel pipe is a steel pipe with a diameter of φ80mm, and the pipe wall is fully opened with strip holes of 3*20mm, and the long side direction of the strip holes is consistent with the radial direction of the strip hole steel pipe. The interval between the long sides of each strip hole is 2.5mm, and the interval between the short sides of each strip hole is 3.5mm.

[0010] Further, the length * width * height of the square water avoidance frame is 1200*1200*550mm, and the bottom is connected to the inverted cone bottom.

[0011] Further, two valves are provided below the discharge port, which are a gate valve and an arc valve respectively.

[0012] Further, the volume of the tank body is 0.2 - 0.5m3 , the vacuum degree is ≥ 0.015 MPa, the main intake pipe extends deep into the middle and lower part of the tank body, and the outlet pipe is at the top of the tank body.

[0013] Further, the air extraction volume of the jet pipe is 200 - 300 m 3 / h; the flow rate of the water pump is 80 - 100 m 3 / h, and the head is ≥ 50 m; the volume of the steady flow tank is 3 - 5 m 3 , and the height is > 1.2 m; the volume of the defoaming tank is 8 - 10 m 3 , and the height is > 1.2 m; the height of the liquid level control board is 0.8 - 1.0 m; the height of the outlet of the steady flow tank from the bottom of the steady flow tank is 0.05 - 0.1 m; the height of the drain outlet is > 0.065 m of the height of the liquid level control board.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. The gravity-vacuum combined water drainage device of this wet tailings silo for storage adopts a combined method of gravity field water drainage and negative pressure water pumping to reduce the moisture content of wet sand. The moisture content can be reduced to below 14% within 12 hours and to below 12% within 24 hours, without visible water traces.

[0016] 2. The gravity-vacuum combined water drainage device of this wet tailings silo for storage uses the silo to store wet sand, and can realize quantitative non-dropping loading in the form of directly discharging materials to the vehicle, completely solving a series of environmental problems brought by the loading of the scraper after the wet sand lands and piles up. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall structural schematic diagram of the present utility model;

[0018] Figure 2 is the bottom view of the silo of the present utility model;

[0019] Figure 3 is the structural schematic diagram of the vacuum sleeve of the present utility model;

[0020] Figure 4 is the connection structural schematic diagram of the buffer tank and the jet vacuum kit of the present utility model.

[0021] In the figure: 1. Feed inlet; 2. Dome; 3. Cylinder body; 4. Inverted cone bottom; 5. Vacuum sleeve; 51. Metal mesh; 52. Round hole steel pipe; 53. Third layer of filter cloth; 54. Slotted hole steel pipe; 55. Flange; 56. Vacuum pipeline connection port; 6. Water-proof frame; 61. Discharge port; 7. Buffer tank; 71. Main air inlet pipeline; 72. Outlet pipe; 73. Pressure gauge; 74. Tank body; 8. Jet vacuum kit; 81. Air inlet; 82. Jet pipe; 83. Air outlet; 84. Water pump; 85. Outlet of the steady flow box; 86. Drainage port; 87. Steady flow box; 88. Liquid level control board; 89. Defoaming box; 9. Gate valve; 10. Arc valve. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1-4 , a gravity vacuum combined water drainage device for a wet tailings silo in this embodiment, includes a cylinder body 3, a buffer tank 7 and a jet vacuum kit 8. The buffer tank 7 and the jet vacuum kit 8 are placed on the ground and are connected by pipelines. Among them, the upper end of the cylinder body 3 is a dome 2, and a feed inlet 1 is provided at the center of the dome 2; the lower end of the cylinder body 3 is an inverted cone bottom 4, and the feed inlet 1, the dome 2 and the inverted cone bottom 4 form a vertical three-dimensional space structure from top to bottom inside the cylinder body 3. Among them, the inverted cone bottom 4 is provided with 36 vacuum sleeves 5 arranged in a vertical plane in a dispersed manner. The vacuum sleeve 5 is provided with four layers of water permeable devices from outside to inside, namely the first layer of metal mesh 51, the second layer of round hole steel pipe 52, the third layer of filter cloth 53, and the fourth layer of slotted hole steel pipe 54. A flange 55 connected to the inverted cone bottom 4 is provided at the lower part of the vacuum sleeve 5, and a vacuum pipeline connection port 56 is also provided at the bottom of the vacuum sleeve 5. Among them, the height of the water permeable device above the flange 55 is 1000 mm, and the length of the vacuum pipeline connection port 56 below the flange 55 is set according to the connection requirements; the metal mesh 51 in the water permeable device is an 80-mesh stainless steel mesh; the round hole steel pipe 52 is a steel pipe with a diameter of φ100 mm, and the pipe wall is fully opened with round holes of φ5 mm, and the distance between the round holes is 2.5 mm; the filter cloth 53 is a non-woven fabric with a specification of 200 g / ㎡; the slotted hole steel pipe 54 is a steel pipe with a diameter of φ80 mm, and the pipe wall is fully opened with strip holes of 3*20 mm. The long side direction of the strip holes is consistent with the radial direction of the slotted hole steel pipe 54, the distance between the long sides of each strip hole is 2.5 mm, and the distance between the short sides of each strip hole is 3.5 mm.

[0024] At the bottom of the inverted conical bottom 4, a square water avoidance frame 6 is also provided. The length * width * height of the square water avoidance frame 6 is 1200 * 1200 * 550 mm. The bottom is connected to the inverted conical bottom 4. The empty space inside the square water avoidance frame 6 is the discharge port 61. Two valves are provided below the discharge port 61, namely the gate valve 9 and the arc valve 10.

[0025] In the above embodiment, all the vacuum pipe connectors 56 at the bottoms of the 36 vacuum sleeves 5 are converged and connected to the buffer tank 7. The buffer tank 7 includes an intake main pipe 71, an outlet pipe 72, a pressure gauge 73, and a tank body 74. The volume of the tank body 74 is 0.2 - 0.5 m 3 , the vacuum degree ≥ 0.015 MPa. The intake main pipe 71 extends into the middle and lower part inside the tank body 74, and the outlet pipe 72 is at the top inside the tank body 74.

[0026] In the above embodiment, the buffer tank 7 is connected to the jet vacuum kit 8 through the outlet pipe 72. The jet vacuum kit 8 includes an intake port 81, a jet pipe 82, an outlet port 83, a water pump 84, a steady flow box outlet 85, a drain port 86, a steady flow box 87, a liquid level control board 88, and a defoaming box 89. The front end of the intake port 81 is connected to the water pump 84 and the outlet pipe 72. The rear end of the intake port 81 is connected to the jet pipe 82. The rear end of the jet pipe 82 is connected to an outlet port 83. The rear end of the outlet port 83 is connected to the defoaming box 89. The defoaming box 89 and the steady flow box 87 are connected in parallel and isolated by the liquid level control board 88 in the middle. The space above the top of the liquid level control board 88 is connected and communicated. The top of the defoaming box 89 is connected to the drain port 86. The lower part of the steady flow box 87 is connected to the steady flow box outlet 85. The rear end of the steady flow box outlet 85 is connected to the water pump 84. Among them, the air extraction volume of the jet pipe 82 is 200 - 300 m 3 / h; the flow rate of the water pump 84 is 80 - 100 m 3 / h, and the head ≥ 50 m; the volume of the steady flow box 87 is 3 - 5 m 3 , the height > 1.2 m; the volume of the defoaming box 89 is 8 - 10 m 3 , the height > 1.2 m; the height of the liquid level control board 88 is 0.8 - 1.0 m; the height of the steady flow box outlet 85 from the bottom of the steady flow box 87 is 0.05 - 0.1 m; the height of the drain port 86 > the height of the liquid level control board 88 + 0.065 m.

[0027] Working principle: During use, the produced wet sand is conveyed into this device. The wet sand with a moisture content exceeding the standard enters from the feed inlet 1, falls and accumulates at the inverted cone bottom 4. As the production output increases, the accumulation height must not rise. At this time, under the action of gravity, the capillary water adhering to the surface of the sand naturally descends under the action of gravity. Therefore, the moisture content of the wet sand accumulated at the inverted cone bottom 4 continuously increases, quickly rises above 14%, and continues to rise as the production process progresses. When the height of the wet sand accumulated in the cylinder 3 exceeds 6m, the accumulated water at the bottom of the inverted cone bottom 4 will rise in a form similar to the phreatic line. When the cylinder 3 is filled with wet sand, the height of the phreatic line from the bottom of the inverted cone bottom 4 will rise above 500mm. At this time, the jet vacuum kit 8 is turned on for negative pressure pumping operation. When the jet vacuum kit 8 operates stably, the buffer tank 7 connected to the jet vacuum kit 8 forms a low vacuum state with a pressure of about -0.025MPa, so that the 36 vacuum sleeves 5 connected to the buffer tank 7 also form a low vacuum state with a pressure of about -0.025MPa. At this time, the natural downward pressure difference of gravity exceeding 6m and the low vacuum state with a pressure of about -0.025MPa together constitute a combined force field composed of gravity and vacuum, enabling the sedimentary water below the phreatic line to continuously enter the vacuum sleeves 5, converge and then enter the buffer tank 7, further enter the jet pipe 82, enter the defoaming tank 89 through the jet pipe 82. The defoaming tank 89 naturally separates the steam-water mixture under the action of the density difference. The bubbles float to the surface and return to the air, and the water remains in the defoaming tank 89. During the continuous operation process, more and more water enters the defoaming tank 89. Part of the water enters the steady flow tank 87 to ensure the stable operation of the jet vacuum kit 8. After the liquid level rises to the drain port 86, the excess water naturally flows out from the drain port 86, completing the entire gravity-vacuum combined water drainage process.

[0028] In the above embodiment, after the jet vacuum kit 8 operates for 2 hours, the phreatic line drops below the upper edge of the square water-proof frame 6. At this time, the moisture content of the sand above the upper edge of the square water-proof frame 6 drops below 12%, meeting the standard requirement that no water leaks during 50km of automobile transportation. After the jet vacuum kit 8 operates for 12 hours, the moisture content of the sand above the upper edge of the square water-proof frame 6 drops below 11%, meeting the standard requirement that no water leaks during 200km of automobile transportation.

[0029] To sum up: The gravity-vacuum combined water drainage device for a wet tailings sand silo provided by the present utility model adopts the "gravity + vacuum combined water drainage" technology to reduce the moisture content of fine-grained tailings within 24 hours, ensuring that the fine-grained tailings can be normally produced, stored and sold, and solving the problem that the high moisture content of the existing fine-grained tailings causes sprinkling and dripping along the way during automobile transportation and sales, resulting in non-compliance with environmental protection standards.

[0030] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0031] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gravity-vacuum combined water drainage device for a wet tailings silo, comprising a cylinder body (3), a buffer tank (7) and a jet vacuum kit (8), characterized in that: The upper end of the cylinder body (3) is a dome (2), and a feed inlet (1) is provided at the center of the dome (2); the lower end of the cylinder body (3) is an inverted conical bottom (4), and a number of vacuum sleeves (5) are arranged vertically and horizontally on the inverted conical bottom (4). A square water-proof frame (6) is also provided at the bottom of the inverted conical bottom (4), and the empty space inside the square water-proof frame (6) is a discharge port (61); the vacuum sleeve (5) is connected to a buffer tank (7) through a vacuum pipeline connection port (56) provided at the bottom, and the buffer tank (7) includes an air inlet main pipeline (71), an air outlet pipe (72), a pressure gauge (73) and a tank body (74); the buffer tank (7) is connected to a jet vacuum kit (8) through the air outlet pipe (72), and the jet vacuum kit (8) includes an air inlet (81), a jet pipe (82), an air outlet (83), a water pump (84), a steady flow tank outlet (85), a drain port (86), a steady flow tank (87), a liquid level control board (88) and a defoaming tank (89); the front end of the air inlet (81) is connected to the water pump (84) and the air outlet pipe (72), the rear end of the air inlet (81) is connected to the jet pipe (82), the rear end of the jet pipe (82) is connected to an air outlet (83), the rear end of the air outlet (83) is connected to the defoaming tank (89), the defoaming tank (89) and the steady flow tank (87) are connected in parallel, and are separated by a liquid level control board (88) in the middle. The space above the top of the liquid level control board (88) is connected, the top of the defoaming tank (89) is connected to a drain port (86), the lower part of the steady flow tank (87) is connected to a steady flow tank outlet (85), and the rear end of the steady flow tank outlet (85) is connected to the water pump (84).

2. The gravity-vacuum combined water drainage device for a silo storing wet tailings according to claim 1, wherein: The feed inlet (1), the dome (2) and the inverted conical bottom (4) form a three-dimensional space structure that is vertical from top to bottom inside the cylinder body (3).

3. The gravity-vacuum combined water drainage device for a silo storing wet tailings according to claim 1, wherein: Four layers of water-permeable devices are arranged from outside to inside in the vacuum sleeve (5), namely the first layer of metal mesh (51), the second layer of round-hole steel pipe (52), the third layer of filter cloth (53), and the fourth layer of strip-hole steel pipe (54). A flange (55) connected to the inverted conical bottom (4) is provided at the lower part of the vacuum sleeve (5).

4. The gravity-vacuum combined water drainage device for a silo storing wet tailings according to claim 3, characterized in that: The height of the water-permeable device above the flange (55) is 1000 mm, and the length of the vacuum pipeline connection port (56) below the flange (55) is set according to the connection requirements.

5. The gravity-vacuum combined water drainage device for a wet tailings silo according to claim 3, characterized in that: The metal mesh (51) in the water-permeable device is an 80-mesh stainless steel mesh; the round-hole steel pipe (52) is a steel pipe with a diameter of φ100 mm, and the pipe wall is full of round holes with a diameter of φ5 mm, and the distance between the round holes is 2.5 mm; the filter cloth (53) is non-woven fabric with a specification of 200 g / ㎡; the strip-hole steel pipe (54) is a steel pipe with a diameter of φ80 mm, and the pipe wall is full of strip holes of 3*20 mm. The long side direction of the strip holes is consistent with the radial direction of the strip-hole steel pipe (54), the distance between the long sides of each strip hole is 2.5 mm, and the distance between the short sides of each strip hole is 3.5 mm.

6. The gravity-vacuum combined water drainage device for a silo storing wet tailings according to claim 1, wherein: The length * width * height of the square water-proof frame (6) is 1200*1200*550 mm, and the bottom is connected to the inverted conical bottom (4).

7. The gravity-vacuum combined water drainage device for a silo storing wet tailings according to claim 6, wherein: Two valves are provided below the discharge port (61), namely a gate valve (9) and an arc valve (10).

8. A gravity-vacuum combined water drainage device for a silo storing wet tailings according to claim 1, characterized in that: The volume of the tank body (74) is 0.2 - 0.5 m 3 , the vacuum degree is ≥ 0.015 MPa, the main air inlet pipe (71) extends deep into the middle and lower part of the tank body (74), and the air outlet pipe (72) is at the top inside the tank body (74).

9. The gravity-vacuum combined water drainage device for a silo storing wet tailings according to claim 1, wherein: The air extraction volume of the jet pipe (82) is 200 - 300 m 3 / h; the flow rate of the water pump (84) is 80 - 100 m 3 / h, and the head is ≥ 50 m; the volume of the steady flow tank (87) is 3 - 5 m 3 , and the height is > 1.2 m; the volume of the defoaming tank (89) is 8 - 10 m 3 , and the height is > 1.2 m; the height of the liquid level control board (88) is 0.8 - 1.0 m; the height of the steady flow tank outlet (85) from the bottom of the steady flow tank (87) is 0.05 - 0.1 m; the height of the drain outlet (86) is > 0.065 m of the height of the liquid level control board (88).

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