Tailing in-situ curing treatment system and treatment method

Abstract

The invention discloses a tailing in-situ curing treatment system and method. The tailing in-situ curing treatment system comprises a curing slurry supply device, a controller and a grouting device. The grouting device comprises a hollow grouting pipe, and jet holes are formed in the hollow grouting pipe. The curing slurry supply device comprises a curing slurry source and a pressure adjusting device; and the slurry storage cavity of the solidified slurry source is communicated with the grouting cavity of the hollow grouting pipe. The signal end of the controller is connected with the control end of the pressure adjusting device. By means of the tailing in-situ curing treatment system, the hollow grouting pipe can be placed in a tailing pile body to be treated; filling the slurry into a grouting cavity; and the curing slurry enters the tailings to be treated through the jet holes, so that the tailings are cured. By means of the system, operation can be conducted in situ on the tailing accumulation body, the solidification effect in the tailing accumulation body can be guaranteed, environmental hazards such as landslide or debris flow are avoided, meanwhile, high treatment efficiency can be kept, and low cost can be kept.

Description

Technical Field

[0001] This invention relates to tailings harmless treatment technology, particularly to an in-situ solidification treatment system for tailings, and also to an in-situ solidification treatment method for tailings. Background Technology

[0002] Tailings are mainly waste generated during mining and mineral processing. Most tailings are stored by stockpiling and naturally dehydrated to form tailings piles.

[0003] There are many problems with storing tailings in stockpiles. For example, they can cause serious environmental pollution. Tailings contain harmful substances such as heavy metals (e.g., arsenic, mercury) and chemicals, which may pollute surrounding rivers and soil through rainwater runoff or groundwater seepage. Dry tailings sand may be dispersed by the wind, forming dust and exacerbating air pollution. Long-term accumulation of tailings stockpiles can damage ecosystems. The unstable structure of tailings stockpiles may lead to landslides or debris flows.

[0004] Currently, there are various tailings treatment technologies, such as CN101327384B which discloses a hydrocyclone-based classification and concentration technology. CN101912866B discloses a tailings solidification method that mixes tailings with a solidifying agent, but this method requires mixing and grinding the tailings and solidifying agent, which leads to a complex solidification process and results in low solidification efficiency and high cost.

[0005] How to efficiently and cost-effectively solidify tailings and reduce or avoid the aforementioned problems in tailings piles is a current technical challenge. Summary of the Invention

[0006] One of the objectives of this invention is to provide an in-situ solidification treatment system for tailings, which can efficiently and cost-effectively solidify tailings piles, thereby reducing or avoiding environmental pollution caused by tailings piles.

[0007] Based on the above-mentioned tailings in-situ solidification treatment system, the present invention also provides a tailings in-situ solidification treatment method, which can also efficiently and cost-effectively solidify tailings piles and reduce or avoid environmental pollution caused by tailings piles.

[0008] The tailings in-situ solidification treatment system provided by the present invention includes a solidification slurry supply device, a controller, and multiple grouting devices.

[0009] The grouting device includes a vertical drive mechanism and a hollow grouting pipe used in conjunction. The hollow grouting pipe is provided with multiple jet holes that communicate with each other inside and out, and is used to be placed into the tailings pile to be treated. The vertical drive mechanism is poweredly connected to the hollow grouting pipe to drive the hollow grouting pipe to move in the vertical direction.

[0010] The curing slurry supply device includes a curing slurry source and a pressure regulating device; the slurry storage chamber of the curing slurry source is connected to the grouting chamber of the hollow grouting pipe; the pressure regulating device is used to regulate the pressure of the curing slurry injected into the grouting chamber.

[0011] The signal terminal of the controller is connected to the control terminal of the pressure regulating device to regulate the pressure of the solidified slurry injected into the grouting cavity.

[0012] This tailings in-situ solidification system utilizes a vertical drive mechanism to insert multiple hollow grouting pipes into the tailings pile to be treated. The storage chamber of the solidification slurry source is then connected to the grouting chamber of the hollow grouting pipes, filling the grouting chamber with solidification slurry. A controller then controls the pressure of the solidification slurry injected into the grouting chamber, causing the slurry to enter the tailings through nozzles, thus bringing it into contact with the particles of the tailings pile and achieving solidification. This system allows for in-situ operation on the tailings pile, eliminating the need for pulverization or other treatments. Furthermore, by appropriately configuring the position and density of the hollow grouting pipes, the solidification effect within the tailings pile can be guaranteed, preventing environmental hazards such as landslides or debris flows, while maintaining high processing efficiency and low cost.

[0013] In a further technical solution, the density of the jet holes gradually increases from top to bottom. With the same effective flow cross-section, increasing the density of the lower jet holes can increase the jet velocity, improve the contact or penetration efficiency between the solidified slurry and the tailings, and thus promote the solidification efficiency and uniformity of the tailings.

[0014] In a further technical solution, the vertical driving mechanism includes a fixed sleeve and a rotary driving device; a helical fit is formed between the helical groove on the inner wall of the fixed sleeve and the helical protrusion on the outer circumferential surface of the hollow grouting pipe; the rotary driving device is poweredly connected to the hollow grouting pipe to drive the hollow grouting pipe to rotate relative to the fixed sleeve, and to move vertically relative to the fixed sleeve under the action of the helical fit. The helical fit structure facilitates the vertical movement of the hollow grouting pipe with less driving force; furthermore, the helical protrusion structure on the outer circumferential surface of the hollow grouting pipe also facilitates interaction with the tailings accumulation, generating upward or downward forces, making the movement of the hollow grouting pipe more stable and smoother.

[0015] In a further technical solution, the grouting device includes a flow-adjusting drive mechanism and at least one flow-adjusting sleeve fitted to the inner wall of the hollow grouting pipe; the flow-adjusting sleeve is provided with flow-adjusting holes corresponding to the jet holes on the hollow grouting pipe; the jet holes and flow-adjusting holes at least partially overlap; the flow-adjusting drive mechanism drives the flow-adjusting sleeve to move relative to the hollow grouting pipe, thereby changing the overlap between the corresponding jet holes and flow-adjusting holes. By adjusting the relative position of the jet holes and flow-adjusting holes, the effective jetting cross-section of the jet holes can be adjusted. On the one hand, this allows the hollow grouting pipe to adapt to different types of tailings deposits; on the other hand, it reduces the requirements for the machining accuracy of the jet holes and flow-adjusting holes, reducing the manufacturing cost of the hollow grouting pipe, especially the machining cost of the jet holes. In a further technical solution, both the jet orifice and the flow regulating orifice can be straight holes with the same inner and outer openings, or both can be elongated holes with the same inner and outer openings. Straight holes are easier to process, while elongated holes can further increase the range of overlap between the jet orifice and the flow regulating orifice, thus making them more suitable for a wider range of tailings treatments and improving the adaptability of hollow grouting pipes.

[0016] In another preferred embodiment, the grouting device further includes at least two screen plates arranged vertically inside the hollow grouting pipe. The periphery of each screen plate is sealed and connected to the inner wall of the hollow grouting pipe, dividing the grouting chamber into at least three vertically arranged grouting compartments. The grout storage chamber communicates with the lowermost grouting compartment of the hollow grouting pipe. Each screen plate has vertically penetrating perforations, ensuring that the pressure of the solidified grout in the lower grouting compartment is greater than that in the upper grouting compartment. This allows for a higher jet pressure of the lower solidified grout, improving the jetting and penetration efficiency of the solidified grout in the lower grouting compartment. With a shorter jetting and penetration time in the lower grouting compartment, better contact is achieved, improving the uniformity of contact / penetration between the solidified grout and tailings. Furthermore, the perforated screen plates increase the rigidity or strength of the hollow grouting pipe, improving its reusability and providing stability and reliability of the solidified grout jet, thus ensuring the quality of the solidification operation.

[0017] In a preferred embodiment, the flow cross-section formed by the sieve holes of the lower sieve plate can be smaller than that formed by the sieve holes of the upper sieve plate, so as to create an effect of increasing solidification slurry flow pressure from top to bottom, thus ensuring the quality of the solidification operation.

[0018] The tailings in-situ solidification treatment method provided by this invention uses the above-mentioned tailings in-situ solidification treatment system; the tailings in-situ solidification treatment method includes the following steps: S100, using the vertical drive mechanism, multiple hollow grouting pipes are placed into the tailings pile to be treated.

[0019] S200, connect the storage chamber of the solidified slurry source with the injection chamber of the hollow injection pipe, and fill the injection chamber with the solidified slurry.

[0020] S300, control the pressure of injecting solidified slurry into the grouting cavity, so that the solidified slurry enters the tailings to be treated through the jet hole.

[0021] In one alternative technical solution, after step S300, the method further includes: separating the vertical drive mechanism and the hollow grouting pipe, leaving the hollow grouting pipe in the tailings pile. In this way, the hollow grouting pipe forms a structure that strengthens the tailings pile, which can be applied to the solidification of relatively loose tailings piles, or to areas where it is crucial to prevent mudslides and debris flows.

[0022] In a further optional technical solution, the step S300 is followed by the following step: S400, before the tailings in contact with the solidifying slurry harden, the hollow grouting pipe is raised at a predetermined speed using the vertical drive mechanism, and the tailings in contact with the solidifying slurry fill the space left by the rising hollow grouting pipe. This allows unhardened tailings to be reused to fill the space left by the rising hollow grouting pipe, maintaining the overall shape of the treated tailings pile and avoiding or reducing the adverse consequences of hollowing or collapse caused by the solidification process. Attached Figure Description

[0023] Figure 1 The present invention provides a working principle diagram of an in-situ solidification treatment system for tailings.

[0024] Figure 2 This is a partial cross-sectional view of the hollow grouting pipe 120 in the tailings in-situ solidification treatment system provided in another embodiment of the present invention.

[0025] Figure 3 This is an overall cross-sectional view of the hollow grouting pipe 120 in the tailings in-situ solidification treatment system provided in the third embodiment of the present invention.

[0026] Figure 4 This is a flowchart of the tailings in-situ solidification treatment method provided by the present invention. Detailed Implementation

[0027] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that in this document, directional terms are determined with reference to the operational status of the tailings in-situ solidification treatment system.

[0028] Please refer to Figure 1 , Figure 1 This invention provides a schematic diagram of the working principle of an in-situ solidification treatment system for tailings. The in-situ solidification treatment system for tailings provided by this invention includes a solidification slurry supply device 200, a controller 300, and multiple grouting devices 100.

[0029] The grouting device 100 includes a vertical drive mechanism 110 and a hollow grouting pipe 120 used in conjunction. The hollow grouting pipe 120 is provided with a plurality of internally and externally communicating jet holes 121, which are used to be inserted into the tailings pile to be treated. In the embodiment, the jet holes 121 can be funnel-shaped with a smaller inner diameter and a larger outer diameter to facilitate the dispersion and spraying of solidified grout, and to contact or penetrate with the tailings particles to promote the solidification of the tailings particles.

[0030] The vertical drive mechanism 110 is poweredly connected to the hollow grouting pipe 120 to drive the hollow grouting pipe 120 to move vertically. The vertical drive mechanism 110 can be an existing hydraulic lifting mechanism, hoisting mechanism, gear and rack mechanism, etc. In one embodiment of the present invention, the vertical drive mechanism 110 includes a fixed sleeve and a rotary drive device; a helical fit is formed between the helical groove on the inner wall of the fixed sleeve and the helical protrusion on the outer peripheral surface of the hollow grouting pipe 120; the rotary drive device is poweredly connected to the hollow grouting pipe 120 to drive the hollow grouting pipe 120 to rotate relative to the fixed sleeve, and move vertically relative to the fixed sleeve under the action of the helical fit. The spiral joint structure facilitates the up-and-down movement of the hollow grouting pipe 120 with less driving force. On the other hand, the spiral protrusion structure on the outer circumference of the hollow grouting pipe 120 also facilitates the interaction between the hollow grouting pipe 120 and the tailings accumulation, forming an upward or downward force, making the movement of the hollow grouting pipe 120 more stable and smoother.

[0031] The hollow grouting pipe 120 can be made of metal or plastic materials such as PVC (when dealing with tailings deposits with strong verticality, a suitable well can be formed first using a drilling rig, and then the hollow grouting pipe 120 can be inserted).

[0032] The solidified slurry supply device 200 includes a solidified slurry source 210 and a pressure regulating device 220. The solidified slurry source 210 can be a fixed solidified slurry storage tank, a storage tank carried by a mobile vehicle, etc. The solidified slurry can include existing solidifying agents. Of course, depending on the composition of the tailings to be treated, a solidifying agent with suitable composition can be selected to form a corresponding solidified slurry.

[0033] The slurry storage chamber 210a of the solidified slurry source 210 and the grouting chamber 120a of the hollow grouting pipe 120 can be connected through a suitable pipe or conveying channel 201 to convey the solidified slurry. Of course, the pipe or conveying channel can be set as a main pipe or branch pipes according to actual needs.

[0034] The pressure regulating device 220 is used to regulate the pressure of the solidified slurry injected into the grouting chamber 120a. The pressure regulating device 220 can be an air pump or a piston structure, to pressurize or depressurize the solidified slurry to be transported as needed, so that the solidified slurry in the grouting chamber 120a has a suitable pressure.

[0035] The signal terminal of the controller 300 is connected to the control terminal of the pressure regulating device 220 to regulate the pressure of the solidified grout injected into the grouting chamber 120a. This achieves automated control or keeps the pressure within an appropriate range.

[0036] Using this tailings in-situ solidification treatment system, the vertical drive mechanism 110 can be used to place multiple hollow grouting pipes 120 into the tailings pile to be treated; then, the grout storage chamber 210a of the solidification grout source 210 is connected to the grouting chamber 120a of the hollow grouting pipe 120, and the solidification grout is filled into the grouting chamber 120a, which can be completely filled; then, the controller 300 controls the pressure of the solidification grout injected into the grouting chamber 120a, so that the solidification grout enters the tailings to be treated through the spray hole 121, thereby allowing the solidification grout to contact or penetrate the particles of the tailings pile, thereby achieving the solidification of the tailings. This system allows for in-situ operation of tailings deposits without the need for relocation or treatment of the tailings deposits or tailings. Furthermore, by appropriately configuring the position and density (or spacing) of the hollow grouting pipes 120, the solidification effect in the tailings deposits can be ensured, avoiding environmental hazards such as landslides or debris flows. At the same time, it can maintain relatively high processing efficiency and low cost.

[0037] In one embodiment, the density of the jet holes 121 gradually increases from top to bottom. With the same effective flow cross-section, increasing the density of the lower jet holes increases the jet velocity, increases the amount of solidified slurry that contacts or penetrates the tailings particles per unit time, and improves the contact or penetration efficiency between the lower solidified slurry and the tailings. Thus, when the lower jet time is shorter and the upper jet time is longer, the difference in contact or penetration between the upper and lower solidified slurries can be reduced, thereby promoting tailings solidification efficiency and uniformity.

[0038] Please refer to Figure 2This figure is a partial cross-sectional view of a hollow grouting pipe 120 in a tailings in-situ solidification treatment system according to another embodiment of the present invention. In this embodiment, the grouting device 100 includes a flow-regulating drive mechanism and at least one flow-regulating sleeve 130 attached to the inner wall of the hollow grouting pipe 120. In this embodiment, the flow-regulating sleeve 130 is relatively short in vertical dimensions, only partially covering the inner wall surface of the hollow grouting pipe 120. To ensure the sealing between the outer circumference of the flow-regulating sleeve 130 and the inner wall surface of the hollow grouting pipe 120, the flow-regulating sleeve 130 can be made of plastic material, which can easily achieve a good sealing fit and is also easy to process and shape. The centerline of the flow-regulating sleeve 130 can be collinear with the centerline of the hollow grouting pipe 120. The flow regulating sleeve 130 is provided with a flow regulating hole 131 corresponding to the jet hole 121 on the hollow grouting pipe 120. That is, the flow regulating hole 131 and the jet hole 121 can have a one-to-one correspondence, and the jet hole 121 and the flow regulating hole 131 at least partially overlap.

[0039] A flow-adjusting drive mechanism (not shown in the figure) drives the flow-adjusting sleeve 130 to move relative to the hollow grouting pipe 120, thereby changing the overlap between the corresponding jet orifice 121 and the flow-adjusting orifice 131, and altering the effective flow cross-section of the jet orifice 121. By changing the relative position of the jet orifice 121 and the flow-adjusting orifice 131, the effective jet cross-section of the jet orifice 121 can be adjusted. On the one hand, this allows the hollow grouting pipe 120 to adapt to different types of tailings deposits; on the other hand, it reduces the requirements for the machining accuracy of the jet orifice 121 and the flow-adjusting orifice 131, thereby reducing the manufacturing cost of the hollow grouting pipe 120, especially the machining cost of the jet orifice 121. In a further technical solution, the jet hole 121 and the flow regulating hole 131 can both be straight holes with the same inner and outer openings, or the jet hole 121 and the flow regulating hole 131 can both be elongated holes with the same inner and outer openings. Straight holes are easier to process, while elongated holes can further increase the range of overlap dimensions between the jet hole 121 and the flow regulating hole 131, thereby making them more suitable for more types of tailings treatment and improving the adaptability of the hollow grouting pipe 120.

[0040] It is understood that moving the flow-regulating sleeve 130 relative to the hollow grouting pipe 120 can be achieved by moving the flow-regulating sleeve 130 in the vertical direction relative to the hollow grouting pipe 120. In this case, the flow-regulating drive mechanism (not shown in the figure) can be a linear drive mechanism, such as a hydraulic cylinder, a gear and rack, etc. Alternatively, the flow-regulating sleeve 130 can be moved in the circumferential direction relative to the hollow grouting pipe 120, which means the flow-regulating sleeve 130 rotates relative to the hollow grouting pipe 120. In this case, the flow-regulating drive mechanism can be a rotary drive mechanism, such as a motor, a hydraulic motor, etc.

[0041] Please refer to Figure 3This figure is an overall cross-sectional view of the hollow grouting pipe 120 in the tailings in-situ solidification treatment system provided by the third embodiment of the present invention. In this embodiment, the grouting device 100 further includes at least three screen plates 140a, 140b, and 140c arranged vertically inside the hollow grouting pipe 120; the periphery of the screen plate 140 is closed and connected to the inner wall of the hollow grouting pipe 120, dividing the grouting cavity 120a into at least four vertically arranged grouting compartments S1, S2, S3, and S4.

[0042] The grout storage chamber 210a is connected to the lowermost grouting compartment S4 of the hollow grouting pipe 120. As shown in the figure, in the grouting device 100, the upper end of the hollow grouting pipe 120 is closed and a central through pipe 101 is provided. The upper end of the central through pipe 101 is connected to the grout storage chamber 210a of the solidified grout source 210 through a suitable pipe, and the lower end extends downward to the lowermost grouting compartment S4, so that the grout storage chamber 210a is connected to the lowermost grouting compartment S4 of the hollow grouting pipe 120.

[0043] The sieve plates 140a, 140b, and 140c each have vertically penetrating sieve holes, ensuring that the pressure of the solidified grout in the lower grouting cavities S1, S2, and S3 is greater than that in the upper grouting cavities S1, S2, and S3. In this embodiment, the diameter of the sieve holes on each sieve plate is 2mm, which creates corresponding resistance when the solidified grout flows through. Thus, the solidified grout flowing out of the grout storage chamber 210a first enters the lowermost grouting cavity S4, then flows upwards, passing through the sieve holes of sieve plate 140c into the uppermost grouting cavity S3, then through the sieve holes of sieve plate 140b into the uppermost grouting cavity S2, and finally through the sieve holes of sieve plate 140a into the uppermost grouting cavity S1. Each time the grout passes through the sieve holes, the pressure of the solidified grout decreases, thereby ensuring that the pressure of the solidified grout in the lower grouting cavities is greater than that in the upper grouting cavities. This design allows for higher pressure in the lower solidification slurry jet, improving the uniformity of contact / penetration between the solidification slurry and tailings. Furthermore, the perforated sieve plate increases the rigidity or strength of the hollow grouting pipe 120, enhancing its reusability and providing stability and reliability for the solidification slurry jet, thus ensuring the quality of the solidification operation. In a further optional technical solution, the flow cross-section formed by the perforations of the lower sieve plate 140 can be smaller than that formed by the perforations of the upper sieve plate 140. This results in a greater pressure drop for the solidification slurry after passing through the lower sieve plate and a smaller pressure drop after passing through the upper sieve plate, further creating a top-to-bottom pressure increase in the solidification slurry flow and ensuring the quality of the solidification operation.

[0044] like Figure 4The flowchart shown is a process for the in-situ solidification treatment method for tailings provided by the present invention. Using the above-described in-situ solidification treatment system, the in-situ solidification treatment method for tailings provided by the present invention includes the following steps: S100, using the vertical drive mechanism 110, multiple hollow grouting pipes 120 are placed into the tailings pile to be treated.

[0045] S200, connect the slurry storage chamber 210a of the solidified slurry source 210 with the grouting chamber 120a of the hollow grouting pipe 120, and fill the solidified slurry into the grouting chamber 120a.

[0046] S300, control the pressure of injecting solidified slurry into the grouting chamber 120a, so that the solidified slurry enters the tailings to be treated through the jet hole 121.

[0047] In one embodiment, after step S300, the method further includes separating the vertical drive mechanism 110 and the hollow grouting pipe 120, leaving the hollow grouting pipe 120 in the tailings pile. In this way, the hollow grouting pipe 120 forms a structure that reinforces the tailings pile, which can be applied to the solidification of relatively loose tailings piles, or to areas where special attention is needed to prevent mudslides and debris flows.

[0048] In another embodiment, the following steps are included after step S300.

[0049] S400, before the tailings in contact with the solidifying slurry harden, the hollow grouting pipe 120 is raised at a predetermined speed using the vertical drive mechanism 110, and the tailings in contact with the solidifying slurry fill the space left by the rising hollow grouting pipe 120. This allows unhardened tailings to be reused to fill the space left by the rising hollow grouting pipe 120, thus maintaining the overall morphology of the treated tailings pile and avoiding or reducing the adverse consequences of the solidification process.

[0050] The specific embodiments provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention, and the descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A tailings in-situ solidification treatment system, comprising a solidification slurry supply device (200), a controller (300), and multiple grouting devices (100): The grouting device (100) includes a vertical drive mechanism (110) and a hollow grouting pipe (120) used in conjunction. The hollow grouting pipe (120) is provided with a plurality of jet holes (121) that communicate with the inside and outside, and is used to be placed into the tailings pile to be treated. The vertical drive mechanism (110) is poweredly connected to the hollow grouting pipe (120) to drive the hollow grouting pipe (120) to move in the vertical direction. The curing slurry supply device (200) includes a curing slurry source (210) and a pressure regulating device (220); the slurry storage chamber (210a) of the curing slurry source (210) is connected to the grouting chamber (120a) of the hollow grouting pipe (120); the pressure regulating device (220) is used to regulate the pressure of the curing slurry injected into the grouting chamber (120a); The signal terminal of the controller (300) is connected to the control terminal of the pressure regulating device (220) to regulate the pressure of the solidified grout injected into the grouting cavity (120a).

2. The tailings in-situ solidification treatment system according to claim 1, characterized in that, The density of the jet holes (121) gradually increases in the downward direction.

3. The tailings in-situ solidification treatment system according to claim 1, characterized in that, The vertical drive mechanism (110) includes a fixed sleeve and a rotary drive device; a spiral fit is formed between the spiral groove on the inner wall of the fixed sleeve and the spiral protrusion on the outer circumference of the hollow grouting pipe (120); the rotary drive device is poweredly connected to the hollow grouting pipe (120) to drive the hollow grouting pipe (120) to rotate relative to the fixed sleeve, and move in the vertical direction relative to the fixed sleeve under the action of the spiral fit.

4. The tailings in-situ solidification treatment system according to any one of claims 1 to 3, characterized in that, The grouting device (100) includes a flow adjustment drive mechanism and at least one flow adjustment sleeve (130) attached to the inner wall of the hollow grouting pipe (120); the flow adjustment sleeve (130) is provided with a flow adjustment hole (131) corresponding to the spray hole (121) on the hollow grouting pipe (120); the spray hole (121) and the flow adjustment hole (131) overlap at least partially; the flow adjustment drive mechanism drives the flow adjustment sleeve (130) to move relative to the hollow grouting pipe (120), thereby changing the overlap of the corresponding spray hole (121) and the flow adjustment hole (131).

5. The tailings in-situ solidification treatment system according to claim 4, characterized in that, The jet hole (121) and the flow regulating hole (131) are both straight holes or elongated holes with the same inner and outer openings.

6. The tailings in-situ solidification treatment system according to any one of claims 1 to 3, characterized in that, The grouting device (100) further includes at least two screen plates (140a, 140b, 140c) arranged vertically inside the hollow grouting pipe (120); the periphery of the screen plate (140) is closed and connected to the inner wall of the hollow grouting pipe (120), dividing the grouting cavity (120a) into at least three vertically arranged grouting compartments (S1, S2, S3, S4); The grout storage chamber (210a) is connected to the lowermost grouting compartment (S4) in the hollow grouting pipe (120); The sieve plates (140a, 140b, 140c) all have through holes running vertically, so that the pressure of the solidified grout in the lower grouting cavities (S1, S2, S3) is greater than the pressure of the solidified grout in the upper grouting cavities (S1, S2, S3).

7. The tailings in-situ solidification treatment system according to claim 6, characterized in that, The flow cross section formed by the sieve holes of the lower sieve plate (140) is smaller than the flow cross section formed by the sieve holes of the upper sieve plate (140).

8. A method for in-situ solidification treatment of tailings, characterized in that, The tailings in-situ solidification treatment system according to any one of claims 1 to 7 is used; the tailings in-situ solidification treatment method includes the following steps: S100, using the vertical drive mechanism (110), multiple hollow grouting pipes (120) are placed into the tailings pile to be treated; S200, connect the slurry storage chamber (210a) of the solidified slurry source (210) with the grouting chamber (120a) of the hollow grouting pipe (120), and fill the solidified slurry into the grouting chamber (120a). S300, control the pressure of injecting solidified slurry into the grouting chamber (120a) so that the solidified slurry enters the tailings to be treated through the jet hole (121).

9. The tailings in-situ solidification treatment method according to claim 8, characterized in that, The process after step S300 further includes: separating the vertical drive mechanism (110) and the hollow grouting pipe (120) and leaving the hollow grouting pipe (120) in the tailings pile.

10. The tailings in-situ solidification treatment method according to claim 8, characterized in that, The step S300 is followed by the following step: S400, before the tailings in contact with the solidified slurry harden, the hollow grouting pipe (120) is raised at a predetermined speed using the vertical drive mechanism (110), and the tailings in contact with the solidified slurry fill the space left by the rise of the hollow grouting pipe (120).

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