A device and method for harmless treatment of coal gangue for artificial soil

Abstract

The present invention belongs to the technical field of artificial soil making, and specifically relates to a device and method for harmless treatment of coal gangue for artificial soil; wherein an inner barrel is nested and formed in an outer barrel to form an interlayer, and a universal wheel is provided on the outer wall of the inner barrel; the inner barrel is nested in the outer barrel to form an interlayer, and a spiral hollow ramp is provided in the interlayer, and a discharge port is provided at the bottom of each layer of the spiral hollow ramp; the inner barrel is nested outside the inner barrel, and the outer barrel is nested in the outer barrel, so that the universal wheel contacts the inner barrel of the barrel; an ultrasonic device is provided on the outer wall of the inner barrel of the barrel, a transmission gear bar is fixed above the inner barrel of the barrel, a motor is fixed in the tank body, and its drive shaft is meshed with the transmission gear bar; the present invention can make a large number of coal gangue particles evenly and fully contact with the leaching liquid, and realize the strong flushing of the coal gangue particles by the leaching liquid, and then, with the help of a certain concentration of leaching liquid and the strengthening effect of ultrasound, realize low-cost and high-efficiency treatment of large-scale coal gangue solid waste, so that the coal gangue can be further used for artificial soil making.

Description

Technical Field

[0001] The present invention belongs to the technical field of artificial soil making, and in particular relates to a device and method for harmless treatment of coal gangue used in artificial soil. Background Art

[0002] As a vital industrial raw material and energy source, coal provides a powerful driving force for social development and operation. However, the mining and washing processes often produce gangue. Long-term storage of gangue occupies significant land and poses the risk of spontaneous combustion. Furthermore, the long-term interaction with rainwater transfers heavy metals from the gangue into the surrounding soil and groundwater, severely harming the entire ecological environment.

[0003] Currently, the comprehensive utilization of coal gangue primarily includes power generation, construction material production, chemical product extraction, underground backfilling, and land reclamation. While the first few methods have limited consumption of coal gangue, land reclamation, as a means of harmless treatment of coal gangue, can maximize the realization of the principle of on-site solid waste disposal. However, this process requires a key consideration regarding the long-term release of pollutants. This requires preliminary treatment of substandard coal gangue prior to reclamation, ensuring that it meets soil pollution risk control standards before soilification.

[0004] In the field of pollution remediation, leaching is an effective technology for contaminated soil remediation, mainly divided into in-situ leaching and ex-situ leaching. In-situ leaching is mostly suitable for large-scale soil remediation, but its remediation cycle is relatively long. Alternatively, there are cases where electrokinetic remediation technology is combined with in-situ leaching to accelerate the remediation process, but this also brings the issue of high energy consumption. Compared to in-situ leaching, ex-situ leaching allows for easier collection of the post-leaching contaminated liquid, facilitating the recycling of heavy metals. Furthermore, in ex-situ leaching, various measures can be used to enhance the leaching process, such as ultrasonic assistance, electrokinetic remediation, and the addition of different eluents.

[0005] Compared to contaminated soil, coal gangue, obtained through the washing process, contains relatively low levels of heavy metals. However, the heavy metals are mostly present in stable silicate and oxidizable states. Therefore, enhanced leaching methods are necessary to ensure a certain heavy metal removal rate. However, large-scale gangue treatment also requires consideration of cost and efficiency. Currently, how to address this large-scale gangue leaching issue while minimizing costs and improving efficiency is a pressing issue in this field. Summary of the Invention

[0006] In order to overcome the above problems, the present invention provides a device and method for harmless treatment of coal gangue for artificial soil, which can make a large number of coal gangue particles evenly and fully contact with the elution liquid, and realize the strong flushing of the coal gangue particles by the elution liquid. Then, with the help of a certain concentration of elution liquid and the strengthening effect of ultrasound, low-cost and efficient treatment of large-scale coal gangue solid waste is achieved, so that the finally treated coal gangue can be used for artificial soil.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A harmless treatment device for coal gangue used in artificial soil, comprising: a liquid storage tank 1, a leaching system 2, and a driving system;

[0009] The liquid storage tank 1 includes a tank body, a discharge valve 12, and a universal wheel 13. The tank body includes an inner barrel 11 and an outer barrel 14. The inner barrel 11 is nested and fixed in the outer barrel 14, so that a sandwich is formed between the inner barrel 11 and the outer barrel 14. A plurality of discharge valves 12 are circumferentially provided below the side wall of the outer barrel 14 and communicate with the inner sandwich. A plurality of universal wheels 13 are circumferentially provided on the outer wall of the inner barrel 11 in sequence from top to bottom.

[0010] The elution system 2 includes a spiral hollow ramp 21, a cylinder and an ultrasonic device 22; the cylinder includes an outer cylinder 23 and an inner cylinder 24, the inner cylinder 24 is a hollow cylinder with a first reinforcing bracket 28 on the top and no bottom plate at the bottom, the outer cylinder 23 is a hollow cylinder with no top plate and bottom plate, wherein the inner cylinder 24 is sleeved in the outer cylinder 23, so that a sandwich is formed between the inner cylinder 24 and the outer cylinder 23, and the sandwich is provided with multiple layers of spiral hollow ramps 21 staggered in sequence, and an annular steel frame 25 is provided at the bottom of the sandwich, and a corresponding discharge port 26 is provided on the annular steel frame 25 at the bottom of each layer of the spiral hollow ramp 21;

[0011] The inner cylinder 24 of the cylinder is sleeved on the outside of the inner barrel 11 of the tank body, and the outer cylinder 23 of the cylinder is sleeved on the outer barrel 14 of the tank body, so that the universal wheel 13 outside the inner barrel 11 contacts the inner wall of the inner cylinder 24; a plurality of ultrasonic devices 22 are fixed on the outer wall of the inner cylinder 24 of the cylinder body, and a transmission gear bar 27 arranged along the circumferential direction is fixed on the inner wall above the inner cylinder 24 of the cylinder body;

[0012] The driving system includes a motor 3, wherein the motor 3 is fixed above the inner barrel 11 of the tank body, and the driving shaft of the motor 3 is engaged with the transmission gear bar 27 through a gear.

[0013] The spiral hollow ramp 21 includes a plurality of steps 211 and a movable baffle 212, wherein the plurality of steps 211 are connected together in sequence in a spiral shape, and each step 211 is formed by fixing a hollow inclined panel 213 and a flat panel 214 together, and the two sides of the step 211 are respectively fixed on the inner wall of the outer cylinder 23 and the outer wall of the inner cylinder 24 of the cylinder body; a movable baffle 212 is provided at the bottom of the flat panel 214 of each step 211, and the top of the movable baffle 212 is movably connected to one side of the bottom of the corresponding flat panel 214, and is tilted between the corresponding two layers of spiral hollow ramps 21, so that its bottom contacts the other side of the top of the corresponding flat panel 214 on the spiral hollow ramp 21 located on the lower layer.

[0014] The multiple layers of spiral hollow ramps 21 are staggered in sequence as follows: the positions of all the spiral hollow ramps 21 are obtained by rotating one of the spiral hollow ramps 21 around the central axis of the cylinder by a certain angle in sequence, and the flat plate 214 of the last step 211 at the bottom of each spiral hollow ramp 21 is laid on the annular steel frame 25, and the edge of the flat plate 214 is located at the corresponding discharge port 26.

[0015] Filter screens are laid on the wall of the outer cylinder 23 of the cylinder, the annular steel frame 25 and the hollow inclined panel 213.

[0016] A plurality of second reinforcing brackets 16 are provided in the inner barrel 11 of the tank body.

[0017] A plurality of supports 15 are provided at the bottom of the bottom plate of the outer barrel 14 of the tank body.

[0018] A method for harmless treatment of coal gangue for artificial soil, specifically comprising the following contents:

[0019] Step 1: inject the eluent into the interlayer of the tank body of the liquid storage tank 1, so that the cylinder of the eluent system 2 is placed in the eluent of the liquid storage tank, thereby ensuring that the spiral hollow ramp 21 is immersed in the eluent in the tank body interlayer;

[0020] Step 2: Start the motor 3 to rotate the cylinder counterclockwise. As the cylinder rotates, crushed gangue particles are added into the interlayer of the cylinder from above. With the help of the hydraulic effect generated by the movement of the solution caused by the rotation of the cylinder, the bottom of the movable baffle 212 is flushed by water and opened. That is, the movable baffle 212 rotates upward, separating its bottom from the corresponding flat plate 214, and then spreading the gangue particles on each layer of the spiral hollow ramp 21.

[0021] Step 3: The motor 3 is again controlled to rotate in the reverse direction, causing the cylinder to rotate clockwise. With the help of the hydraulic force generated by the rotation of the cylinder and the movement of the solution, the bottom of the movable baffle 212 is flushed by water and is in a closed state. That is, the movable baffle 212 rotates downward so that its bottom contacts the corresponding flat plate 214. At the same time, the ultrasonic device 22 is turned on to ultrasonically clean the particulate matter.

[0022] Step 4: After the cleaning is completed, the motor 3 is turned off to stop the rotation of the cylinder, and the gangue particles are washed onto the flat plate 214 on the bottom step 211 of the spiral hollow ramp 21 by the inertia of the previous solution rotation;

[0023] Step 5: Take the cylinder out of the tank, separate it from the elution liquid, and then open the discharge port 26 to unload the washed coal gangue particles.

[0024] In step 4, if the particles are not completely flushed to the bottom of the spiral hollow ramp 21, the motor 3 is controlled to rotate so that the cylinder rotates counterclockwise again. The hydraulic force generated by the rotation of the cylinder and the movement of the solution is used to flush as many particles as possible to the bottom of the spiral hollow ramp 21 to ensure complete unloading.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The setting of the spiral ramp can make a large number of coal gangue particles more evenly distributed in the solution, so that they can be eluted more fully. The movable baffle can make the coal gangue particles move in one direction on the spiral ramp. Initially, the coal gangue particles move downward and spread on the spiral ramp, while the large-scale movement of coal gangue particles is avoided during elution.

[0027] (2) The device and method can subject the gangue particles to a strong flushing effect of the leaching liquid during the leaching process. At the same time, the centrifugal force generated by the device, different types of leaching agents and ultrasonic effects will further enhance the leaching effect, increase the heavy metal leaching removal rate, and promote cost reduction and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a schematic structural diagram of the liquid storage tank of the present invention;

[0031] Figure 3 It is a partial structural diagram of the elution system of the present invention;

[0032] Figure 4 Schematic diagram of the drive system structure of the present invention;

[0033] Figure 5 This is a schematic diagram of the spiral hollow ramp structure of the present invention;

[0034] Figure 6 This is a schematic diagram of the detailed structure of the spiral hollow ramp of the present invention;

[0035] Figure 7 It is a cross-sectional perspective view of a part of the rinsing system of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0037] Example 1

[0038] A harmless treatment device for coal gangue used in artificial soil, such as Figure 1-7 As shown, it includes: a liquid storage tank 1, a rinsing system 2, and a driving system;

[0039] The liquid storage tank 1 includes a tank body, a discharge valve 12, and a universal wheel 13. The tank body includes a hollow inner barrel 11 and a hollow outer barrel 14. The inner barrel 11 is nested and fixed within the outer barrel 14, forming a sandwich between the inner barrel 11 and the outer barrel 14. A plurality of discharge valves 12 are circumferentially provided below the sidewall of the outer barrel 14 and communicate with the sandwich therein. The outer wall of the inner barrel 11 is circumferentially provided with a plurality of universal wheels 13 arranged sequentially from top to bottom in a plurality of rows (the inner barrel 11 has no top or bottom plates at its top and bottom, and the outer barrel 14 has no top plate at its top and a bottom plate at its bottom).

[0040] The elution system 2 includes a spiral hollow ramp 21, a cylinder and an ultrasonic device 22; the cylinder includes an outer cylinder 23 made of a steel frame and an inner cylinder 24 made of a steel plate, the inner cylinder 24 is a hollow cylinder with a first reinforcing bracket 28 on the top and no bottom plate at the bottom, the outer cylinder 23 is a hollow cylinder without a top plate and a bottom plate at the top and bottom, wherein the inner cylinder 24 is sleeved in the outer cylinder 23, so that a sandwich is formed between the inner cylinder 24 and the outer cylinder 23, and at the same time, multiple layers of spiral hollow ramps 21 are staggered in sequence in the sandwich, and an annular steel frame 25 is provided at the bottom of the sandwich, the outer ring of the annular steel frame 25 is fixed to the bottom of the inner wall of the outer cylinder 23, and the inner ring of the annular steel frame 25 is fixed to the bottom of the outer wall of the inner cylinder 24; and a corresponding discharge port 26 is provided on the annular steel frame 25 at the bottom of each layer of the spiral hollow ramp 21;

[0041] The inner cylinder 24 of the cylinder is sleeved on the outside of the inner barrel 11 of the tank body, and the outer cylinder 23 of the cylinder is sleeved on the outer barrel 14 of the tank body, so that the universal wheel 13 outside the inner barrel 11 of the tank body contacts the inner wall of the inner cylinder 24 of the cylinder body; a plurality of ultrasonic devices 22 are fixed on the outer wall of the inner cylinder 24 of the cylinder body (the ultrasonic devices 22 are waterproof ultrasonic devices with their own power supply, or ordinary waterproof ultrasonic devices, whose power cords pass through the filter screen and hollow holes on the outer cylinder 23 to connect to the external power supply), and a transmission gear bar 27 is fixed on the inner wall above the inner cylinder 24 of the cylinder body.

[0042] The drive system includes a motor 3 (the power cord of the motor 3 extends from the hollowed-out top of the inner cylinder 24 of the cylinder to connect to the power supply), wherein the motor 3 is fixed above the inner barrel 11 of the tank body through a second reinforcing bracket 16, and the drive shaft of the motor 3 is engaged with the transmission gear bar 27 through a gear.

[0043] The spiral hollow ramp 21 includes a plurality of steps 211 and a movable baffle 212, wherein the plurality of steps 211 are connected together in a spiral shape in sequence, and the steps 211 rise in a counterclockwise spiral in sequence. Each step 211 is formed by fixing a hollow inclined panel 213 and a flat panel 214 together, and the two sides of the step 211 are respectively fixed on the inner wall of the outer cylinder 23 and the outer wall of the inner cylinder 24 of the cylinder body; a movable baffle 212 is provided at the bottom of the flat panel 214 of each step 211, and the top of the movable baffle 212 is connected to the end of one side of the bottom of the flat panel 214 of the corresponding step 211 by a hinge, and is tilted between the corresponding two layers of spiral hollow ramps 21, so that its bottom contacts the other end of the top of the corresponding flat panel 214 on the spiral hollow ramp 21 on the lower layer.

[0044] The multiple layers of spiral hollow ramps 21 are staggered in sequence as follows: the positions of all the spiral hollow ramps 21 are obtained by rotating one of the spiral hollow ramps 21 around the central axis of the cylinder by a certain angle in sequence, and the flat plate 214 of the last step 211 at the bottom of each spiral hollow ramp 21 is laid on the annular steel frame 25, and the edge of the flat plate 214 is located at the corresponding discharge port 26.

[0045] The driving system also includes a lifting cylinder 5 and a mobile gantry 4; the lifting cylinder 5 is fixed to the top crossbar of the mobile gantry 4, and the moving end of the lifting cylinder 5 is fixed to the first reinforcing bracket 28 at the top of the inner cylinder 24 of the cylinder.

[0046] Filter screens are laid on the side walls of the outer cylinder 23 , the annular steel frame 25 and the hollow inclined panel 213 of the cylinder.

[0047] The diameter of the inner cylinder 24 of the cylinder is larger than the diameter of the inner barrel 11 of the tank body, and the diameter of the outer cylinder 23 of the cylinder is smaller than the diameter of the outer barrel 14 of the tank body.

[0048] A plurality of second reinforcing brackets 16 are provided in the inner barrel 11 of the tank body.

[0049] The outer cylinder 23 of the cylinder body is lower than the inner cylinder 24 .

[0050] A plurality of supports 15 are provided at the bottom of the bottom plate of the outer barrel 14 .

[0051] A method for harmless treatment of coal gangue for artificial soil, using a coal gangue harmless treatment device for artificial soil to perform enhanced leaching on slightly contaminated coal gangue, specifically comprising the following steps:

[0052] Step 1: A specific eluent is prepared into an eluent of a certain concentration and injected into the interlayer of the tank body, so that the cylinder is placed in the eluent in the liquid storage tank, thereby ensuring that the spiral hollow ramp 21 is immersed in the eluent in the tank interlayer;

[0053] Step 2: Start the motor 3 to rotate the cylinder counterclockwise. As the cylinder rotates, crushed gangue particles are gradually added from the upper interlayer of the cylinder into the interlayer. With the help of the hydraulic effect generated by the movement of the solution caused by the rotation of the cylinder, the bottom of the movable baffle 212 is flushed by water and opened. That is, the movable baffle 212 rotates upward to separate its bottom from the corresponding hollow inclined plate 213, thereby distributing the gangue particles relatively evenly on each layer of the spiral hollow ramp 21.

[0054] Since the surface of the flat plate 214 of the step 211 is relatively smooth, it is difficult for particles to stay. Under the relatively uniform fluid force, assisted by the uniform feeding speed, it can basically ensure that the particles can be evenly distributed on the spiral ramp 3 in the early stage.

[0055] Step 3: Control the motor 3 to rotate in the opposite direction again, causing the cylinder to rotate clockwise. With the help of the hydraulic force generated by the rotation of the cylinder and the movement of the solution, the bottom of the movable baffle 212 is flushed by water and is in a closed state. That is, the movable baffle 212 rotates downward so that its bottom contacts the corresponding hollow inclined panel 213. At the same time, the ultrasonic device 22 is turned on to ultrasonically clean the particulate matter.

[0056] Step 4: After the cleaning is completed, the motor 3 is turned off to stop the rotation of the cylinder. The gangue particles are washed onto the flat plate 214 on the bottom step 211 of the spiral hollow ramp 21 by the inertia of the previous solution rotation (at this time, the bottom of the movable baffle 212 is flushed by water and is in an open state, so that the gangue particles can be washed downward on each layer of the spiral hollow ramp 21);

[0057] Step 5: Take the cylinder out of the tank (open the lifting cylinder 5 and lift the cylinder. At this time, the gear on the drive shaft of the motor 3 is disengaged from the transmission gear bar 27), separate it from the washing liquid, and then open the discharge port 26 to unload the washed coal gangue particles.

[0058] In step 4, if the particles are not completely flushed to the bottom of the spiral hollow ramp 21, the motor 3 is controlled to rotate so that the cylinder rotates counterclockwise again. The hydraulic force generated by the rotation of the cylinder and the movement of the solution is used to flush as many particles as possible to the bottom of the spiral hollow ramp 21 to ensure complete unloading.

[0059] Example 2

[0060] like Figure 1 , a harmless treatment device for coal gangue used in artificial soil, comprising a liquid storage tank, a leaching device and a driving device;

[0061] The liquid storage tank 1 includes a tank body, a support 15, a drain valve 12, a second reinforcement bracket 16, and a universal wheel 13. The outer diameter of the tank body is 4m, and the inner diameter is 2m. The tank body is 10mm thick and 2.1m high and is made of steel plate. There are 8 supports 15 below the tank body, distributed vertically. Four drain valves 12 are installed at the bottom of the tank body. The inner layer of the tank body is reinforced with I-beams to strengthen the rigidity of the tank body. The overall structure of the liquid storage tank is as follows: Figure 2 shown.

[0062] The leaching system 2 includes a cylinder, a spiral hollow ramp 21, a movable baffle 212, a metal filter, and an ultrasonic device 22. The cylinder, the spiral hollow ramp 21, and the movable baffle 212 are mainly used to bear the weight, and the filter is laid on the surface of the three to filter the coal gangue particles. The ultrasonic device 22 is fixed to the inner wall of the cylinder and rotates with the rotation of the cylinder. The cylinder and the spiral hollow ramp 21 are connected by welding, and the movable baffle 212 is connected to the spiral hollow ramp 21 by installing a hinge on the top, as shown in FIG. Figure 3 The length of the movable baffle 212 is sufficient to keep it tilted, and the tilt direction is the same as that of the spiral hollow ramp 21; the outer diameter of the cylinder is 3.8m, and the inner diameter is 2.2m; the rotation angle of the spiral hollow ramp 21 is 360°, and there are 6 of them in total.

[0063] The drive system includes an oil pump, motor 3, lifting cylinder 5, hydraulic piping, mobile gantry 4, and transmission gear 27. The oil pump primarily provides power for lifting the rinsing device and is connected to the lifting cylinder 5 via hydraulic piping. The lifting cylinder 5 is fixed to the mobile gantry 4 and is mechanically connected to the rinsing device, enabling its vertical movement. The motor 3, connected to the rinsing device via transmission gear 27, rotates the rinsing device within the liquid storage tank.

[0064] The method for harmless treatment of coal gangue using the above-mentioned device in the embodiment includes the following steps:

[0065] (a) A specific eluent is prepared into an eluent of a certain concentration and placed in a liquid storage tank 1.

[0066] (b) Start the oil pump and place the elution system 2 into the liquid storage tank 1 to ensure that the spiral hollow ramp 21 is immersed in the solution.

[0067] (c) Start motor 3, causing elution system 2 to rotate counterclockwise. Simultaneously, crushed gangue particles are gradually added from above. The hydraulic action generated by the rotation of elution system 2, which in turn drives the solution, moves the gangue particles to the bottom of the device and distributes them relatively evenly on the spiral hollow ramp 21.

[0068] (d) Adjust the motor 3 to make the rinsing system 2 rotate in the reverse direction and turn on the ultrasonic device 22 at the same time.

[0069] (e) Adjust the motor to the braking mode to slow down the leaching system 2 and use the inertia of the solution to flush the coal gangue particles to the bottom of the leaching system 2.

[0070] (f) Use the oil pump to lift the elution system 2 again to separate it from the elution liquid. Then open the discharge port at the bottom of the elution system 2 to unload the eluted coal gangue particles.

[0071] In the step (a), the overall shape of the liquid storage tank 1 is a hollow cylinder with an open top, a bottom and no cover; the inner wall is equipped with a universal wheel 13 to constrain the elution system 2 so that it can rotate stably.

[0072] In the step (a), the eluent is preferably selected from a 0.08 mol / L aqueous solution of ethylenediaminetetraacetic acid, a 0.2 mol / L aqueous solution of citric acid, or a 0.1 mol / L aqueous solution of ferric chloride;

[0073] In step (b), the spiral hollow ramp 21 is composed of a plurality of steps 211, which are arranged in a counterclockwise spiral. The flat surface of the steps 211 is covered with a relatively smooth metal plate; the vertical surface of the steps 211 is slightly inclined, and a filter screen is laid on the surface;

[0074] In the step (c), the solid-liquid mass ratio between the added gangue particles and the eluent is between 1 / 5 and 1 / 10;

[0075] In the step (c), the particle size of the crushed gangue particles is maintained at about 1 mm.

[0076] The cylinder, spiral hollow ramp 21 and movable baffle 212 constituting the elution system 2 are all welded from steel mesh, the nominal diameter of the steel bars is not less than 12 mm, and the mesh size is not greater than 100 mm; the aperture of the filter is not greater than the particle size of the coal gangue particles.

[0077] The movable baffle 212 in the rinsing system 2 is placed between the two layers of spiral hollow ramps 21, and is connected to the spiral hollow ramp 21 by a hinge on the top, and is not connected below. Its length is sufficient to keep it tilted, and the tilt direction is the same as the ramp.

[0078] The motor 3 for driving the rinsing device to rotate is fixed on the second reinforcing bracket 16 inside the liquid storage tank 1. A transmission gear bar 27 is fixed on the inner wall of the rinsing system 2. The motor 3 drives the rinsing system 2 to rotate through the transmission gear bar 27.

[0079] According to the above dimensions of the liquid storage tank 1, when the solution height is 2m, the solution volume is about 18.85m 3 ; Taking the solid-liquid ratio of the elution liquid as 1:5, the elution liquid contained in the storage tank 1 in this example can meet the elution requirements of about 3.7t of coal gangue at a time.

[0080] The estimated weight of the elution system 2 is about 2 tons. Therefore, the total mass of the elution system 2, the gangue particles, and the fluid in the container is about 25 tons. Assuming that the three components reach the same speed when driven by the motor, the sum of their moments of inertia, I, is about 62500 kg·m 3 Assuming that the overall rotation speed reaches 3.14 rad / s within 1 minute, the theoretical minimum power required is P = E / (t·η) = 0.5Iω 2 / (t·η)=10kW. Furthermore, twelve 2kW ultrasonic devices 22 are provided in this embodiment. Therefore, in one hour, the ultrasonic devices 22 consume approximately 24kw·h of electricity. A single rinse cycle lasts for 6 minutes. According to the aforementioned rinse steps, the drive device is activated intermittently. Assuming a single rinse cycle lasts for 4 minutes, the drive device consumes approximately 10kw·h of energy per hour. The total energy consumption of these two devices is approximately 0.5 yuan / t.

[0081] In the above embodiment, it is assumed that the content of pollutants exceeding the standard in the washed coal gangue is as follows:

[0082]

[0083] In the above embodiment, the eluent is 0.08 mol / L EDTA aqueous solution, so 18.85 m 3 The solution contains approximately 1500 mol of EDTA. Assuming 80% of the EDTA participates in complexation reactions with heavy metals, this means the solution needs to be replaced approximately every 20 hours of leaching. Based on the current market price of EDTA of 13 yuan per kg, the cost of the EDTA eluent required to treat the heavy metal-contaminated gangue is approximately 7.6 yuan per ton.

[0084] In summary, in the above embodiment, the additional total cost of washing gangue is only about RMB 8 / t, compared with conventional washing. This achieves low-cost treatment of gangue solid waste, and the processing efficiency of a single device reaches about 37t per hour.

[0085] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the scope of protection of the present invention is not limited to the specific details of the above embodiments. Within the technical concept of the present invention, any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and inventive concept of the present invention within the technical scope disclosed by the present invention. These simple variations all fall within the scope of protection of the present invention.

[0086] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0087] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A harmless treatment device for coal gangue used in artificial soil, characterized in that: include: Liquid storage tank (1), elution system (2), drive system; The liquid storage tank (1) comprises a tank body, a discharge valve (12) and a universal wheel (13); wherein the tank body comprises an inner barrel (11) and an outer barrel (14); the inner barrel (11) is sleeved and fixed in the outer barrel (14) so ​​that an interlayer is formed between the inner barrel (11) and the outer barrel (14); a plurality of discharge valves (12) communicating with the inner interlayer are provided along the circumferential direction below the side wall of the outer barrel (14); and a plurality of universal wheels (13) are provided along the circumferential direction of the outer wall of the inner barrel (11) in sequence from top to bottom; The elution system (2) includes a spiral hollow ramp (21), a cylinder and an ultrasonic device (22); the cylinder includes an outer cylinder (23) and an inner cylinder (24), the inner cylinder (24) is a hollow cylinder with a first reinforcing bracket (28) on the top and no bottom plate at the bottom, and the outer cylinder (23) is a hollow cylinder with no top plate and bottom plate at the top and bottom, wherein the inner cylinder (24) is sleeved in the outer cylinder (23), so that a sandwich is formed between the inner cylinder (24) and the outer cylinder (23), and the sandwich is provided with multiple layers of spiral hollow ramps (21) staggered in sequence, and an annular steel frame (25) is provided at the bottom of the sandwich, and a corresponding discharge port (26) is provided on the annular steel frame (25) at the bottom of each layer of the spiral hollow ramp (21); The inner cylinder (24) of the cylinder is sleeved on the outside of the inner barrel (11) of the tank body, and the outer cylinder (23) of the cylinder is sleeved on the inside of the outer barrel (14) of the tank body, so that the universal wheel (13) outside the inner barrel (11) of the tank body contacts the inner wall of the inner cylinder (24); a plurality of ultrasonic devices (22) are fixed on the outer wall of the inner cylinder (24) of the cylinder body, and a transmission gear (27) arranged along the circumferential direction is fixed on the inner wall above the inner cylinder (24); The drive system comprises a motor (3), wherein the motor (3) is fixed above the inner barrel (11) of the tank body, and the drive shaft of the motor (3) is meshed with a transmission gear bar (27) through a gear; The spiral hollow ramp (21) comprises a plurality of steps (211) and a movable baffle (212), wherein the plurality of steps (211) are connected together in a spiral shape, and each step (211) is formed by fixing a hollow inclined panel (213) and a flat panel (214) together, and the two sides of the step (211) are respectively fixed to the inner wall of the outer cylinder (23) and the outer wall of the inner cylinder (24) of the cylinder body; a movable baffle (212) is provided at the bottom of the flat panel (214) of each step (211), and the top of the movable baffle (212) is movably connected to one side of the bottom of the corresponding flat panel (214) and is tilted between the corresponding two layers of the spiral hollow ramp (21), so that the bottom thereof contacts the other side of the top of the corresponding flat panel (214) on the spiral hollow ramp (21) located on the lower layer; The multiple layers of spiral hollow ramps (21) are staggered in sequence, and the positions of all the spiral hollow ramps (21) are obtained by rotating one of the spiral hollow ramps (21) around the central axis of the cylinder by a certain angle. The flat plate (214) of the last step (211) at the bottom of each spiral hollow ramp (21) is laid on the annular steel frame (25), and the edge of the flat plate (214) is located at the corresponding discharge port (26).

2. The harmless treatment device for coal gangue used in artificial soil according to claim 1, characterized in that: Filter screens are laid on the outer cylinder (23) wall of the cylinder, the annular steel frame (25), and the hollow inclined panel (213).

3. The harmless treatment device for coal gangue used in artificial soil according to claim 1, characterized in that: A plurality of second reinforcement brackets (16) are provided in the inner barrel (11) of the tank body.

4. The harmless treatment device for coal gangue used in artificial soil according to claim 1, characterized in that: A plurality of supports (15) are provided at the bottom of the bottom plate of the outer barrel (14).

5. A method for harmless treatment of coal gangue using the coal gangue harmless treatment device for artificial soil according to any one of claims 1 to 4, characterized in that: Specifically include the following: Step 1: inject the eluent into the interlayer of the tank body of the liquid storage tank (1), so that the cylinder of the eluent system (2) is placed in the eluent of the liquid storage tank, thereby ensuring that the spiral hollow ramp (21) is immersed in the eluent in the tank body interlayer; Step 2: Start the motor (3) to rotate the cylinder counterclockwise. While the cylinder is rotating, crushed gangue particles are added from the upper interlayer of the cylinder into the interlayer. With the help of the hydraulic effect generated by the movement of the solution caused by the rotation of the cylinder, the bottom of the movable baffle (212) is flushed by water and opened. That is, the movable baffle (212) rotates upward to separate its bottom from the corresponding flat plate (214), thereby spreading the gangue particles on each layer of the spiral hollow ramp (21); Step 3: Control the motor (3) to rotate in the reverse direction again, so that the cylinder rotates clockwise. With the help of the hydraulic force generated by the rotation of the cylinder and the movement of the solution, the bottom of the movable baffle (212) is flushed by water and is in a closed state. That is, the movable baffle (212) rotates downward so that its bottom contacts the corresponding flat plate (214). At the same time, the ultrasonic device (22) is turned on to perform ultrasonic cleaning on the particles. Step 4: After the cleaning is completed, the motor (3) is turned off to stop the rotation of the cylinder, and the gangue particles are washed onto the flat plate (214) on the bottom step (211) of the spiral hollow ramp (21) by means of the inertia of the previous solution rotation; Step 5: Take the cylinder out of the tank, separate it from the leaching liquid, and then open the discharge port (26) to unload the washed coal gangue particles.

6. The method for harmless treatment of coal gangue for artificial soil according to claim 5, characterized in that: In step 4, if the particles are not completely flushed to the bottom of the spiral hollow ramp (21), the motor (3) is controlled to rotate so that the cylinder rotates counterclockwise again. The hydraulic force generated by the rotation of the cylinder and the movement of the solution is used to flush as many particles as possible to the bottom of the spiral hollow ramp (21) to ensure complete unloading.

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