Tailing treatment method used after nickel ore hydrometallurgy

Abstract

The invention belongs to the technical field of foundation construction, and relates to a method for treating tailings after nickel ore hydrometallurgy, which comprises the following steps of: blowing and filling a tailings layer on a construction foundation; laying a soft mattress on the tailing layer, wherein the soft mattress comprises a soft woven bag, a plurality of drainage pipes penetrating through the soft woven bag, and medium-coarse sand filled between the soft woven bag and the drainage pipes; one end of the drainage pipe extends outwards to be connected with a vacuumizing device; a tailing layer is dredger-filled on the soft mattress, and the vacuumizing device is started to conduct vacuumizing operation for preset time; a soft mattress is laid, a tailing layer is dredged and filled, and vacuumizing is conducted again; and the steps are repeated till the dredger tailings reach the preset total height, the sludge layer is dredger-filled, and the vacuumizing device is started to conduct vacuum preloading on all the tailing layers till the consolidation degree of the tailing layers meets the preset requirement. According to the method, the soft mats are used for draining water, the multiple layers of tailings and the multiple soft mats are alternately stacked, and the sludge layer is used for sealing the top layer, the tailings obtained after nickel ore hydrometallurgy are subjected to reinforcement treatment, a newly-built foundation is formed, and tailings treatment and recycling are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of foundation construction, and in particular relates to a method for treating tailings after hydrometallurgy of nickel ore. Background Art

[0002] Laterite nickel ore is a low-grade limonite resource, and its smelting process mainly includes two directions: pyrometallurgy and hydrometallurgy. Among them, pyrometallurgy is suitable for humus layer nickel ore with relatively high nickel content, and hydrometallurgy is suitable for limonite nickel ore with relatively low nickel content. The nickel content of laterite nickel ore is low, generally below 1.3%, and hydrometallurgy is often used, which will produce a large amount of tailings during the production process. According to investigations, a laterite nickel ore hydrometallurgy project with an annual output of 40,000 tons of nickel metal will produce 6 million tons of solid slag per year; therefore, the main difficulty of nickel ore hydrometallurgy lies in tailings treatment.

[0003] As a man-made waste, tailings from the hydrometallurgical smelting of nickel ore are quite different from conventional geotechnical materials. In terms of particle size and morphology, the tailings are relatively small, and the particles are sharper than naturally formed soil. Since hard rock ores are refined by crushing, the tailings produced almost do not contain gravel with a particle size greater than 2 mm and clay particles with a particle size less than 3.9 μm. Most of the particle sizes belong to the sand particle range (625 μm < particle size < 2 mm); while the tailings produced by flotation mining contain a higher powder content, that is, the particles with a particle size of 50 to 300 μm are higher. The tailings from the hydrometallurgical smelting of laterite nickel ore have a relatively low permeability coefficient of about 1×10 -4 cm / s~1×10 -6 cm / s, the tailings also contain a lot of water.

[0004] At present, there are two main methods for treating tailings after hydrometallurgy of nickel ore: deep sea landfill and tailings pond storage. Nowadays, countries are increasingly strict in the management of tailings discharge into the deep sea. Many companies' tailings are basically buried in tailings ponds in mining areas. However, for countries or regions with heavy rainfall and frequent earthquakes, the tailings ponds will face risks such as leakage and dam breach after they are built, which seriously threaten the safety of life and property in the surrounding areas. Summary of the invention

[0005] In view of the deficiencies existing in the related art, the present invention provides a method for treating tailings after hydrometallurgy of nickel ore.

[0006] The present invention provides a method for treating tailings after hydrometallurgy of nickel ore, comprising the following steps:

[0007] S1. Blowing and filling the first layer of tailings on the construction foundation;

[0008] S2, laying the first soft drainage bed on the first layer of tailings; the soft drainage bed includes a soft woven bag and a plurality of drainage pipes; the soft woven bag has a plurality of parallel cylindrical main ribs; each drainage pipe is inserted into a main rib, and the space between the outer wall of the drainage pipe and the inner wall of the main rib is filled with medium-coarse sand; one end of the drainage pipe is an external connection end, which extends out of the main rib and extends upward; a plurality of water-permeable holes are opened on the wall of the drainage pipe located in the main rib; the external connection ends of all drainage pipes of the first soft drainage bed are connected to a vacuum device;

[0009] S3, blowing and filling the second layer of tailings on the soft woven bags of the first soft row; starting the vacuum device to perform the first vacuum operation on the blown tailings layer for a preset time;

[0010] S4, laying a second soft bag on the second layer of tailings, and connecting the external ends of all drainage pipes of the second soft bag to the vacuum device; blowing the third layer of tailings on the soft woven bags of the second soft bag, starting the vacuum device, and performing a second vacuum operation on the blown tailings layer for a preset time;

[0011] S5, repeat step S4 until the nth layer of tailings is blown on the soft woven bags of the (n-1)th soft row to reach a preset total height, blow a silt layer on the nth layer of tailings, and then start the vacuum pumping device to perform vacuum pre-compression on all tailings layers at the same time until the consolidation degree of all tailings layers reaches the preset requirements, thereby forming a new foundation.

[0012] In some of the embodiments, in steps S1, S3 to S5, the filling thickness of each layer of tailings is 1 m to 2 m.

[0013] In some embodiments, in step S5, the silt layer is made of silt having a permeability coefficient less than 1×10 - 8 cm / s of clay, and mixed with 3% of the total weight of the silt with vegetable glue to make the silt paste-like.

[0014] In some of the embodiments, in step S5, the filling thickness of the silt layer is 1m to 2m; the outer boundary of the silt layer is uniformly expanded outward by at least 5m relative to the outer edge of the nth layer of tailings.

[0015] In some of the embodiments, the total area of ​​all the water-permeable holes on each drain pipe of the soft drain is 10% to 20% of the outer wall area of ​​the drain pipe located in the main rib channel.

[0016] In some embodiments, the distance between two adjacent main ribs on the soft body row is 1 m, and the inner diameter of the main rib is 10 cm to 15 cm.

[0017] In some of the embodiments, the soft woven bag further has a plurality of tubular secondary ribs connected between two adjacent primary ribs, and the secondary ribs are filled with medium-coarse sand.

[0018] In some of the embodiments, an outer wall of the drainage pipe located in the main rib channel is also wrapped with an integrated water-permeable filter cloth.

[0019] In some of the embodiments, the vacuum device includes a water-gas separation tank, a vacuum pump, a submersible pump and a water inlet pipe respectively connected to the water-gas separation tank; the water inlet pipe is provided with a plurality of connection ports for connecting to the external ends of a plurality of drainage pipes of a plurality of soft drains; the water in the tailings layer can be sucked into the water-gas separation tank through the soft drain under the action of the vacuum pump, and water-gas separation is performed in the water-gas separation tank, and the separated water is discharged to the outside of the water-gas separation tank through the submersible pump.

[0020] In some of the embodiments, in step S1, the construction foundation is an underwater foundation, a tailings pond foundation, a valley foundation or an onshore foundation.

[0021] Based on the above technical scheme, the tailings treatment method after nickel ore hydrometallurgy in the embodiment of the present invention realizes the reinforcement treatment of tailings after nickel ore hydrometallurgy and forms a new foundation by adopting soft drain for horizontal drainage, alternatingly stacking multiple layers of tailings and multiple soft drains and performing multiple vacuum operations, and sealing the top layer of silt layer. It is highly operational, easy to implement, and can be applied on a large scale on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 It is a schematic diagram of the tailings treatment method after nickel ore hydrometallurgy of the present invention;

[0024] Figure 2 It is a partial cross-sectional view of the software row in the present invention;

[0025] Figure 3 It is a partial top view of the soft body row in the present invention;

[0026] Figure 4 It is a schematic diagram of positioning the drainage pipe at the end of the main rib channel in the present invention;

[0027] Figure 5 is a schematic diagram of a vacuum pumping device in the present invention;

[0028] Figure 6The present invention is a flow chart of the tailings treatment method after nickel ore hydrometallurgy.

[0029] In the figure:

[0030] 1. Soft drain; 11. Soft woven bag; 111. Main rib; 112. Secondary rib; 12. Drain pipe; 13. Medium-coarse sand; 14. Ring; 2. Tailings; 3. Silt layer; 4. Vacuum extraction device; 41. Water-gas separation tank; 42. Vacuum pump; 43. Submersible pump; 44. Water inlet pipe; 441. Connecting port. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "top", "bottom", "inside", "outside", "left", "right", "front", "back", "vertical", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] refer to Figure 1-Figure 6 As shown, the present invention provides a tailings treatment method for nickel ore hydrometallurgy, which is used to treat tailings 2 after nickel ore hydrometallurgy. The tailings treatment method comprises the following steps:

[0036] S1. Filling the first layer of tailings 2 on the construction foundation; specifically, the tailings layer has a certain thickness to form a horizontal cushion layer.

[0037] S2. Lay the first soft geotextile 1 on the first layer of tailings 2, that is, the soft geotextile 1 is laid horizontally as a whole; the soft geotextile 1 includes a soft woven bag 11 and a plurality of horizontally arranged drainage pipes 12; the drainage pipes 12 are hard plastic pipes. The soft woven bag 11 has a plurality of horizontally arranged and mutually parallel cylindrical main ribs 111, and the main ribs 111 extend longitudinally or transversely to the end side of the soft woven bag 11; it can be understood that the soft woven bag 11 is a water-permeable geotextile made of synthetic fibers by needle punching or weaving, and has the advantages of high strength and good water permeability. The rib cavity space of the main rib channel 111 is larger than the outer diameter of the drain pipe 12; each drain pipe 12 is placed in a main rib channel 111 along the length direction of the main rib channel 111, and the outer wall of the drain pipe 12 and the inner wall of the main rib channel 111 are filled with medium-coarse sand 13, so that the main rib channel 111 on the soft body row 1 is cylindrical or approximately cylindrical; further, a sleeve 14 is respectively arranged at both ends of the length direction of the main rib channel 111, the outer wall size of the sleeve 14 is adapted to the inner wall of the main rib channel 111, the inner hole size of the sleeve 14 is adapted to the outer diameter of the drain pipe 12, and the drain pipe 12 is inserted into the inner hole of the sleeve 14, so that the drain pipe 12 and the main rib channel 111 are coaxially arranged; the sleeve 14 has a plurality of hollow holes, and the medium-coarse sand 13 can be filled between the drain pipe 12 and the main rib channel 111 through the hollow holes. One end of the drain pipe 12 is an external end, which extends out of the main rib channel 111 and extends upward. A plurality of water-permeable holes (not shown) are provided on the wall of the drainage pipe 12 located in the main rib channel 111, and the plurality of water-permeable holes are evenly arranged along the length direction and the circumference direction of the drainage pipe 12; no holes are provided on the wall of the drainage pipe 12 located outside the main rib channel 111 to prevent possible external water from directly entering the drainage pipe 12; the external ends of all the drainage pipes 12 of the first soft row 1 are connected to a vacuum device 4.

[0038] S3, blowing the second layer of tailings 2 on the soft woven bag 11 of the first soft row 1 to form another horizontal cushion layer. Start the vacuum device 4, and perform the first vacuum operation on the filled tailings layer for a preset time; it should be noted that the water in the first and second layers of tailings 2 can enter the drain pipe 12 through the soft woven bag 11, the medium-coarse sand 13 outside the drain pipe 12, and the water-permeable holes on the wall of the drain pipe 12 under the vacuum suction of the vacuum device 4, and then be discharged through the vacuum device 4, but at this time the main function of the second layer of tailings 2 is to isolate and seal the soft woven bag 11 of the first soft row 1 from the environment above it. Because the tailings 2 have a relatively low permeability coefficient, it can prevent a large amount of water that may exist in the outside from entering the first soft row 1 and affecting the drainage effect of the first layer of tailings 2.

[0039] S4, laying the second soft row 1 on the second layer of tailings 2, and connecting the external ends of all the drainage pipes 12 of the second soft row 1 to the vacuum device 4. Blowing the third layer of tailings 2 on the soft woven bag 11 of the second soft row 1 to form another horizontal cushion. Start the vacuum device 4, and perform a second vacuum operation on the filled tailings layer for a preset time; it should be noted that the water in the first to third layers of tailings 2 can enter the drainage pipe 12 through the soft woven bag 11, the medium-coarse sand 13 outside the drainage pipe 12, and the water-permeable holes on the wall of the drainage pipe 12 under the vacuum suction of the vacuum device 4, and then be discharged through the vacuum device 4, but at this time the main function of the third layer of tailings 2 is to isolate and seal the soft woven bag 11 of the second soft row 1 from the environment above it. Because the tailings 2 have a relatively low permeability coefficient, it can prevent a large amount of water that may exist in the outside from entering the second soft row 1 and affecting the drainage effect of the second layer of tailings 2.

[0040] S5, repeat step S4 until the nth layer of tailings 2 is blown on the soft woven bag 11 of the (n-1)th soft row 1 to reach the preset total height, and then the silt layer 3 is blown on the nth layer of tailings 2, so that the entire top surface of the nth layer of tailings 2 is completely covered by the silt layer 3. The silt layer 3 has a certain thickness and a lower permeability than the tailings layer, which can isolate and seal the nth layer of tailings 2 from the environment above it, and can prevent the possible water from the outside from invading the nth layer of tailings 2. Then start the vacuum pumping device 4, and vacuum pre-press all tailings layers at the same time, so that the water in all tailings layers is drained outward through the soft row 1 under the vacuum suction of the vacuum pumping device 4, so that the effective stress of each tailings layer is continuously increased and gradually consolidated, until the consolidation degree of all tailings layers reaches the preset requirements, thereby forming a new foundation; on the new foundation, people can carry out subsequent construction according to production or life needs. It is understandable that during the vacuuming process, it is necessary to check whether the sludge layer 3 is cracked or leaking. If so, it should be repaired in time to avoid affecting the vacuum preloading effect of the tailings layer due to leakage.

[0041] The above-mentioned illustrative embodiment can realize vacuum pre-compression of the multi-layer tailings 2 by adopting soft-body row 1 for horizontal drainage, alternately stacking multiple layers of tailings 2 and multiple soft-body rows 1 and performing multiple vacuum operations, and sealing the top layer of silt layer 3, thereby realizing the reinforcement treatment of the tailings 2 after the hydrometallurgy of nickel ore, avoiding the risk of collapse of the tailings 2, and forming a new foundation, thereby processing a large amount of tailings 2 and realizing the reuse of the tailings 2, having strong operability, being easy to realize, and being applicable to large-scale on-site applications.

[0042] refer to Figure 1As shown, in some embodiments, in steps S1, S3 to S5, the filling thickness of each layer of tailings 2 is 1m to 2m, ensuring that the tailings layer can provide stable support for the soft-body row 1, and the thickness of the tailings layer is adapted to the drainage capacity of the soft-body row 1, so that the water in the tailings layer can quickly and fully enter the soft-body row 1 under the action of external vacuum suction, which is beneficial to ensure the reinforcement effect of the tailings layer and avoid the risk of insufficient drainage or collapse due to excessive thickness of the tailings layer.

[0043] In some embodiments, in step S5, the silt layer 3 is made of silt with a permeability coefficient less than 1×10 -8 cm / s clay, and mixed with 3% of the total weight of the silt, so that the silt is paste-like; thereby ensuring that the silt layer 3 has good sealing performance, ensuring that a reliable negative pressure environment is formed under the silt layer 34, and thus ensuring the vacuum preloading effect of the tailings 2.

[0044] refer to Figure 1 As shown, in some embodiments, in step S5, the filling thickness of the silt layer 3 is 1m to 2m to ensure the sealing performance of the silt layer 3 and avoid cracking and leakage of the silt layer 3 during vacuum pre-pressing of the tailings 2.

[0045] refer to Figure 1 As shown, in some embodiments, in step S5, the outer boundary of the silt layer 3 is uniformly expanded outward by at least 5m relative to the outer edge of the nth layer of tailings 2; the external end of the drainage pipe 12 in the soft drain 1 can pass through the silt layer 3, and the sealing of the drainage pipe 12 at the point where it passes through the silt layer 3 must be ensured; thereby, through the outward expansion setting of the silt layer 3, it is reliably prevented that possible external water intrudes into the tailings 2 and affects the vacuum preloading effect of the tailings layer.

[0046] In some embodiments, the total area of ​​all water-permeable holes on each drainage pipe 12 of the soft drain 1 is 10% to 20% of the outer wall area of ​​the drainage pipe 12 located in the main rib channel 111 to ensure the drainage effect when the tailings 2 are vacuum preloaded.

[0047] refer to Figure 2-Figure 3 As shown, in some embodiments, the distance between two adjacent main ribs 111 on the soft body row 1 is 1 m, and the inner diameter of the main rib 111 is 10 cm to 15 cm; the outer diameter of the drainage pipe 12 is smaller than the inner diameter of the main rib 111 .

[0048] refer to Figure 3As shown, in some embodiments, the soft woven bag 11 also has a plurality of cylindrical secondary ribs 112 connected between two adjacent primary ribs 111, and the secondary ribs 112 are filled with medium-coarse sand 13; the secondary ribs 112 can be arranged vertically with the primary ribs 111. This exemplary embodiment assists the flow of water in the soft drain 1 by arranging the secondary ribs 112 between the primary ribs 111. In case of poor flow or blockage in a particular drain pipe 12, water can quickly flow into other drain pipes 12 through the secondary ribs 112 filled with medium-coarse sand 13, thereby ensuring the overall drainage effect of the soft drain 1 with the drain pipe 12.

[0049] In some embodiments, the outer wall of the drain pipe 12 located in the main rib channel 111 is also wrapped with an integrated water-permeable filter cloth, which is permeable to water but not to sand, thereby preventing fine sand particles from entering the drain pipe 12 through the water-permeable holes.

[0050] refer to Figure 5 As shown, in some embodiments, the vacuum device 4 includes a water-gas separation tank 41, a vacuum pump 42, a submersible pump 43 and a water inlet pipe 44 respectively connected to the water-gas separation tank 41. Usually, a water inlet and an air suction port are provided at the upper part of the water-gas separation tank 41, and a drain port is provided at the lower part of the water-gas separation tank 41; the vacuum pump 42 is connected to the air suction port, the submersible pump 43 is connected to the drain port, and the water inlet pipe 44 is connected to the water inlet. A plurality of connection ports 441 are provided on the water inlet pipe 44, and the plurality of connection ports 441 are respectively connected to the external ends of the plurality of drain pipes 12 of the plurality of soft sheets 1. The water in the tailings 2 can be sucked into the water-gas separation tank 41 through the soft sheet 1 under the action of the vacuum pump 42, and water and gas are separated in the water-gas separation tank 41, the separated gas is pumped out of the tank by the vacuum pump 42, and the separated water is discharged to the outside of the water-gas separation tank 41 through the submersible pump 43.

[0051] In some embodiments, in step S1, the construction foundation is an underwater foundation, a tailings pond foundation, a valley foundation or an onshore foundation, that is, the tailings treatment method is applicable to a variety of application scenarios such as underwater, reservoir area, valley, and land. Furthermore, the construction foundation is a reinforced foundation, on which the tailings 2 are treated, achieving the effect of using the tailings 2 to create fields, land, and land.

[0052] In summary, the tailings treatment method after nickel ore hydrometallurgy of the present invention realizes the reinforcement treatment of the tailings 2 after nickel ore hydrometallurgy by adopting a soft row 1 for horizontal drainage, alternately stacking multiple layers of tailings 2 and multiple soft rows 1 and performing multiple vacuum operations, and sealing the top layer of the silt layer 3, thereby avoiding the risk of collapse of the tailings 2 and forming a new foundation, thereby being able to treat a large amount of tailings 2 and realize the reuse of the tailings 2, having strong operability, being easy to implement, having low construction difficulty, and being able to be applied on a large area on site.

[0053] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0054] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A method for treating tailings after nickel ore hydrometallurgy, characterized in that: The following steps are involved: S1. Blowing and filling the first layer of tailings on the construction foundation; S2, laying the first soft-body row on the first layer of tailings; the soft-body row includes a soft-body woven bag and a plurality of drainage pipes; the soft-body woven bag has a plurality of parallel cylindrical main ribs; each of the drainage pipes is inserted into a main rib, and the space between the outer wall of the drainage pipe and the inner wall of the main rib is filled with medium-coarse sand; one end of the drainage pipe is an external connection end, which extends out of the main rib and extends upward; a plurality of water-permeable holes are opened on the wall of the drainage pipe located in the main rib; the external connection ends of all the drainage pipes of the first soft-body row are connected to a vacuum device; S3, blowing and filling a second layer of tailings on the soft woven bags of the first soft row; starting the vacuum pumping device to perform a first vacuum pumping operation on the blown tailings layer for a preset time; S4, laying a second soft bag on the second layer of tailings, and connecting the external ends of all the drainage pipes of the second soft bag to the vacuum device; blowing the third layer of tailings on the soft woven bags of the second soft bag, starting the vacuum device, and performing a second vacuum operation on the blown tailings layer for a preset time; S5, repeating step S4 until the nth layer of tailings is blown onto the soft woven bags of the (n-1)th soft row to reach a preset total height, blowing a silt layer onto the nth layer of tailings, and then starting the vacuum pumping device to simultaneously perform vacuum pre-compression on all tailings layers until the consolidation degree of all tailings layers reaches the preset requirements, thereby forming a new foundation.

2. The tailings treatment method according to claim 1, characterized in that: In steps S1, S3 to S5, the filling thickness of each layer of tailings is 1m to 2m.

3. The tailings treatment method according to claim 1, characterized in that: In step S5, the silt layer is made of silt with a permeability coefficient less than 1×10 -8 cm / s of clay, and mixed with 3% of plant glue accounting for the total weight of the sludge to make the sludge into a paste.

4. The tailings treatment method according to claim 1, characterized in that: In step S5, the filling thickness of the silt layer is 1m to 2m; the outer boundary of the silt layer is uniformly expanded outward by at least 5m relative to the outer edge of the nth layer of tailings.

5. The tailings treatment method according to claim 1, characterized in that: The total area of ​​all the water-permeable holes on each drainage pipe of the soft drain is 10% to 20% of the outer wall area of ​​the drainage pipe located in the main rib channel.

6. The tailings treatment method according to claim 1, characterized in that: The spacing between two adjacent main ribs on the soft material row is 1m, and the inner diameter of the main rib is 10cm-15cm.

7. The tailings treatment method according to claim 1 or 6, characterized in that: The soft woven bag is also provided with a plurality of cylindrical secondary ribs connected between two adjacent primary ribs, and the secondary ribs are filled with medium-coarse sand.

8. The tailings treatment method according to claim 1, characterized in that: The outer wall of the drainage pipe located in the main rib channel is also wrapped with an integrated water-permeable filter cloth.

9. The tailings treatment method according to claim 1, characterized in that: The vacuum pumping device comprises a water-gas separation tank, a vacuum pump, a submersible pump and a water inlet pipe respectively connected to the water-gas separation tank; the water inlet pipe is provided with a plurality of connection ports for connecting with the external connection ends of a plurality of drainage pipes of a plurality of the soft drains; the water in the tailings layer can be sucked into the water-gas separation tank through the soft drain under the action of the vacuum pump, and water-gas separation is performed in the water-gas separation tank, and the separated water is discharged to the outside of the water-gas separation tank through the submersible pump.

10. The tailings treatment method according to claim 1, characterized in that: In step S1, the construction foundation is an underwater foundation, a tailings pond foundation, a valley foundation or an onshore foundation.

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