Coal gangue harmless treatment device and method for artificial soil

Abstract

The invention belongs to the technical field of artificial soil making, and particularly relates to a coal gangue harmless treatment device and method for artificial soil. Wherein the inner barrel is sleeved, an interlayer is formed in the outer barrel, and slave universal wheels are arranged on the outer wall of the inner barrel; the inner cylinder is sleeved in the outer cylinder to form an interlayer, spiral hollow ramps are arranged in the interlayer, and a discharge hole is formed in the bottom of each layer of spiral hollow ramp; the inner barrel is sleeved with the inner barrel, and the outer barrel is sleeved with the outer barrel, so that the universal wheels are in contact with the inner barrel of the barrel body; ultrasonic equipment is arranged on the outer wall of an inner cylinder of the cylinder body, a transmission gear rack is fixed above the inner cylinder of the cylinder body, the motor is fixed in the tank body, and a driving shaft of the motor is meshed with the transmission gear rack; according to the device, a large number of coal gangue particles can make uniform and full contact with the leacheate, the coal gangue particles are forcefully washed by the leacheate, then low-cost and efficient treatment of large-scale coal gangue solid waste is achieved by means of the strengthening effect of the leacheate with a certain concentration and ultrasound, and then the coal gangue can be further used for artificial soil making.

Description

Technical Field

[0001] The 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 for artificial soil. Background Art

[0002] As one of the important industrial raw materials and energy sources, coal provides a strong driving force for the development and operation of society. However, in the process of coal mining and washing, coal gangue is often produced. Long-term storage of coal gangue occupies a large amount of land and poses a risk of spontaneous combustion. In addition, long-term interaction with rainwater will transfer heavy metal elements in coal gangue to the surrounding soil and groundwater, causing serious harm to the entire ecological environment.

[0003] At present, the comprehensive utilization of coal gangue mainly includes power generation, production of building materials, preparation of chemical products, underground filling and land reclamation. Among them, the consumption of coal gangue by the first few ways is limited, and land reclamation, as one of the means of harmless treatment of coal gangue, can realize the principle of on-site disposal of solid waste to the greatest extent. However, in this process, it is necessary to focus on the long-term release of polluting components, which requires preliminary treatment of coal gangue that does not meet the standards before reclamation, so that the coal gangue meets the pollution risk control standards of soil before soilification.

[0004] In the field of pollution remediation, leaching is an effective technology for contaminated soil treatment, which is mainly divided into in-situ leaching and ex-situ leaching. Among them, in-situ leaching is mostly suitable for large-scale soil remediation, but its remediation cycle is relatively long; in addition, there are currently cases of combining electric remediation technology with in-situ leaching to accelerate the remediation process, but it also brings about the problem of high energy consumption. Compared with in-situ leaching, ex-situ leaching can more conveniently collect the contaminated liquid after leaching, which is convenient for the recycling of heavy metals. At the same time, in ex-situ leaching, the leaching process can be enhanced through various measures, such as ultrasonic assistance, electric remediation, and the addition of different leaching agents.

[0005] Compared with contaminated soil, the coal gangue obtained by the washing process has a relatively low content of heavy metals, but the heavy metals are mostly in stable silicate and oxidizable states. Therefore, some enhanced leaching methods are needed to ensure a certain heavy metal leaching removal rate; but when facing large-scale coal gangue treatment, the treatment cost and efficiency issues need to be considered. However, how to ensure that the large-scale coal gangue leaching problem can be solved while minimizing the treatment cost and improving the efficiency is an urgent problem to be solved in this field. Summary of the invention

[0006] In order to overcome the above problems, the present invention provides a harmless treatment device and method for coal gangue for artificial soil, which can make a large number of coal gangue particles contact with the leaching liquid evenly and fully, 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, 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 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, wherein the inner barrel 11 is sleeved and fixed in the outer barrel 14 so that a sandwich is formed between the inner barrel 11 and the outer barrel 14, and a plurality of discharge valves 12 communicating with the inner sandwich are arranged circumferentially below the side wall of the outer barrel 14, and a plurality of universal wheels 13 are arranged sequentially from top to bottom in the circumferential direction of the outer wall of the inner barrel 11;

[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 multiple layers of spiral hollow ramps 21 are arranged in sequence in the sandwich, 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 cylinder 11 of the tank body, and then the outer cylinder 23 of the cylinder is sleeved in the outer cylinder 14 of the tank body, so that the universal wheel 13 outside the inner cylinder 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, 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;

[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 meshed 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 a spiral shape in sequence, 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 obliquely arranged between the corresponding two layers of the spiral hollow ramp 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 staggered in sequence are 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 body, the annular steel reinforcement skeleton 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 interlayer of the tank body;

[0020] Step 2, start the motor 3 to rotate the cylinder counterclockwise. While the cylinder rotates, crushed gangue particles are added into the interlayer from the upper side of the cylinder. With the help of the hydraulic effect generated by the movement of the solution driven by the rotation of the cylinder, the bottom of the movable baffle 212 is flushed by water and is in an open state, that is, the movable baffle 212 rotates upward to separate its bottom from the corresponding flat plate 214, thereby scattering the gangue particles on each layer of the spiral hollow ramp 21;

[0021] Step 3, the motor 3 is controlled to rotate in the reverse direction again, so that the cylinder rotates clockwise. With the help of the hydraulic effect 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, and at the same time, the ultrasonic device 22 is turned on to perform ultrasonic cleaning on the particles;

[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 leaching liquid, and then open the discharge port 26 to unload the washed coal gangue particles.

[0024] In the 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 unidirectionally on the spiral ramp. In the initial stage, the coal gangue particles move downward and spread on the spiral ramp, while avoiding large-scale movement of coal gangue particles 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 action 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 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 diagram of the structure of the liquid storage tank of the present invention;

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

[0032] Figure 4 It is a schematic diagram of the structure of the driving system of the present invention;

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

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

[0035] Figure 7 It is a 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 in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[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 comprises a tank body, a discharge valve 12 and a universal wheel 13; wherein the tank body comprises a hollow inner barrel 11 and a hollow outer barrel 14, wherein the inner barrel 11 is sleeved 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 communicating with the inner sandwich are circumferentially arranged below the side wall of the outer barrel 14, and a plurality of universal wheels 13 arranged sequentially from top to bottom are circumferentially arranged on the outer wall of the inner barrel 11 (the top and bottom of the inner barrel 11 have no top and bottom plates, the top of the outer barrel 14 has no top plate, and the bottom is provided with a bottom plate);

[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 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 at the same time, multiple layers of spiral hollow ramps 21 are arranged 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 then the outer cylinder 23 of the cylinder is sleeved in 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; a plurality of ultrasonic devices 22 are fixed on the outer wall of the inner cylinder 24 of the cylinder (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 arranged along the circumferential direction is fixed on the inner wall above the inner cylinder 24 of the cylinder;

[0042] The driving system includes a motor 3 (a power cord of the motor 3 extends from the hollowed-out top of the inner barrel 24 of the barrel to connect to a power source), wherein the motor 3 is fixed above the inner barrel 11 of the tank body through a second reinforcing bracket 16, and a driving shaft of the motor 3 is meshed with a 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 ascend in a counterclockwise spiral in sequence, 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 connected to one side end of the bottom of the flat panel 214 of the corresponding step 211 through a hinge, and is obliquely arranged between the corresponding two layers of the spiral hollow ramp 21, so that its bottom contacts the other side end of the top of the corresponding flat panel 214 on the spiral hollow ramp 21 located on the lower layer.

[0044] The multiple layers of spiral hollow ramps 21 staggered in sequence are 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 further comprises a lifting cylinder 5 and a mobile gantry 4; the lifting cylinder 5 is fixed on the top cross bar of the mobile gantry 4, and the moving end of the lifting cylinder 5 is fixed on 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 of the cylinder, the annular steel reinforcement skeleton 25 and the hollow inclined panel 213 .

[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 harmless treatment device for coal gangue for artificial soil to perform enhanced leaching on slightly contaminated coal gangue, specifically including the following contents:

[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 of the liquid storage tank, thereby ensuring that the spiral hollow ramp 21 is immersed in the eluent in the interlayer of the tank body;

[0053] Step 2, start the motor 3 to rotate the cylinder counterclockwise. While the cylinder rotates, crushed gangue particles are gradually added into the interlayer from the upper part of the cylinder. With the help of the hydraulic effect generated by the movement of the solution driven by the rotation of the cylinder, the bottom of the movable baffle 212 is flushed by water and is in an open state, that is, the movable baffle 212 rotates upward to separate its bottom from the corresponding hollow inclined panel 213, thereby relatively evenly distributing the gangue particles on each layer of the spiral hollow ramp 21;

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

[0055] Step 3, the motor 3 is controlled to rotate in the opposite direction again, so that the cylinder rotates clockwise. With the help of the hydraulic effect 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, and at the same time, the ultrasonic device 22 is turned on to perform ultrasonic cleaning on the particles;

[0056] 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 (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, lift the cylinder, at this time the gear on the drive shaft of the motor 3 is disengaged from the drive gear bar 27), separate it from the leaching liquid, and then open the discharge port 26 to unload the leached coal gangue particles.

[0058] In the 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, the inner diameter is 2m; the wall thickness of the tank body is 10mm, the height is 2.1m, and it is made of steel plate. There are 8 supports 15 under the tank body, which are vertically distributed; 4 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; wherein the cylinder, the spiral hollow ramp 21 and the movable baffle 212 are mainly used for bearing weight, and the filter is laid on the surface of the three to filter the coal gangue particles; the ultrasonic device 22 is fixed on 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, such as Figure 3 The length of the movable baffle 212 is sufficient to keep it tilted, and the tilting 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 driving system includes an oil pump, a motor 3, a lifting cylinder 5, a hydraulic pipeline, a mobile gantry 4 and a transmission gear bar 27. The oil pump mainly provides power for lifting the rinsing device, and is connected to the lifting cylinder 5 through a hydraulic pipeline. The lifting cylinder 5 is fixed on the mobile gantry 4 and is connected to the rinsing device through a simple mechanical connection, thereby causing the rinsing device to move vertically; the motor 3 causes the rinsing device to rotate in the liquid storage tank; the motor 3 is connected to the rinsing device through the transmission gear bar 27.

[0064] The method for harmless treatment of coal gangue using the above-mentioned device in the embodiment comprises 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 the motor 3 to rotate the leaching system 2 counterclockwise. At the same time, crushed gangue particles are gradually added from the top. With the help of the hydraulic effect generated by the rotation of the leaching system 2 and the movement of the solution, the gangue particles are moved to the bottom of the device and are relatively evenly distributed 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) The motor is adjusted to a braking mode to decelerate the leaching system 2 and the inertia of the solution is used to flush the gangue particles to the bottom of the leaching system 2 .

[0070] (f) The elution system 2 is lifted again by the oil pump to separate it from the elution liquid. Then, the discharge port at the bottom of the elution system 2 is opened to discharge 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 preferred eluent is 0.08 mol / L ethylenediaminetetraacetic acid aqueous solution, 0.2 mol / L citric acid aqueous solution or 0.1 mol / L ferric chloride aqueous solution;

[0073] In the step (b), the spiral hollow ramp 21 is composed of a plurality of steps 211, which are arranged to rise in a counterclockwise spiral. A relatively smooth metal plate is laid on the plane of the step 211; the vertical surface of the step 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 coal 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 mesh 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 two layers of spiral hollow ramps 21, and is connected to the spiral hollow ramp 21 via a hinge on the top, and is not connected on the bottom. Its length is sufficient to keep it tilted, and the tilting direction is the same as that of the ramp.

[0078] The motor 3 for driving the elution device to rotate is fixed on the second reinforcing bracket 16 inside the liquid storage tank 1 , and a transmission gear bar 27 is fixed on the inner wall of the elution system 2 . The motor 3 drives the elution 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 ; Assuming the solid-liquid ratio of the elution liquid is 1:5, the elution liquid contained in the storage tank 1 in this example can meet the elution requirement of about 3.7t of coal gangue at a time.

[0080] The estimated weight of the leaching system 2 is about 2 tons. Therefore, the total mass of the leaching system 2, the gangue particles and the fluid in the container is about 25 tons. Assuming that the three eventually reach the same speed when driven by the motor, the sum of the moments of inertia of the three 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; In addition, a total of 12 2kW ultrasonic devices 22 are provided in the embodiment. Therefore, in one hour, the ultrasonic device 22 consumes about 24kw·h of electricity; the single elution time is 6min, according to the elution steps, the driving device is started intermittently, assuming that the single elution operation is 4min, so the driving device consumes about 10kw·h of energy in one hour; the total energy consumption of these two devices is about 0.5 yuan / t.

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

[0082]

[0083] In the above embodiment, the eluent is 0.08 mol / L ethylenediaminetetraacetic acid aqueous solution, then 18.85 m 3 The solution contains about 1500 mol of EDTA. Assuming that 80% of EDTA will participate in the complexation reaction with heavy metals, it means that the solution needs to be replaced after about 20 hours of elution. Based on the current market price of EDTA of 13 yuan / kg, the cost of EDTA eluent required to treat the heavy metal-contaminated coal gangue is equivalent to about 7.6 yuan / t.

[0084] In summary, in the above embodiment, on the basis of conventional leaching, the additional total cost of leaching coal gangue is only about 8 yuan / t, which realizes low-cost treatment of coal gangue solid waste, and the processing efficiency of a single device reaches about 37 tons per hour.

[0085] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the protection scope of the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention. These simple variations all belong to the protection scope 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 suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0087] In addition, 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), driving 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 circumferentially arranged below the side wall of the outer barrel (14); and a plurality of universal wheels (13) arranged sequentially from top to bottom are circumferentially arranged on the outer wall of the inner barrel (11); The elution system (2) comprises a spiral hollow ramp (21), a cylinder and an ultrasonic device (22); the cylinder comprises an outer cylinder (23) and an inner cylinder (24); the inner cylinder (24) is a hollow cylinder with a first reinforcing bracket (28) at the top and no bottom plate at the bottom; the outer cylinder (23) is a hollow cylinder with no top plate and bottom plate at the top and bottom; 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 a plurality of spiral hollow ramps (21) are arranged in a staggered manner in sequence in the sandwich; an annular steel frame (25) is arranged 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 in 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 bar (27) arranged along the circumferential direction is fixed on the inner wall above the inner cylinder (24); The driving system comprises 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 meshed with a transmission gear bar (27) via a gear.

2. The harmless treatment device for coal gangue used for artificial soil according to claim 1, characterized in that: The spiral hollow ramp (21) comprises a plurality of steps (211) and a movable baffle (212), wherein the plurality of steps (211) are connected 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 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 obliquely arranged between the corresponding two layers of the spiral hollow ramp (21), so that the bottom of the movable baffle (212) contacts the other side of the top of the corresponding flat panel (214) on the spiral hollow ramp (21) located on the lower layer.

3. The harmless treatment device for coal gangue used for artificial soil according to claim 2, characterized in that: The multiple layers of spiral hollow ramps (21) are staggered in sequence: 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 plane 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 plane plate (214) is located at the corresponding discharge port (26).

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

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

6. 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).

7. A method for harmless treatment of coal gangue using the harmless treatment device for artificial soil according to any one of claims 1 to 6, characterized in that: The specific contents 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 interlayer of the tank body; Step 2, starting the motor (3) to rotate the cylinder counterclockwise, while the cylinder rotates, adding crushed gangue particles from the upper part of the interlayer of the cylinder into the interlayer, with the help of the hydraulic effect generated by the movement of the solution driven by the rotation of the cylinder, the bottom of the movable baffle (212) is flushed by water and is in an open state, that is, the movable baffle (212) rotates upward, so that its bottom is separated from the corresponding flat plate (214), and the gangue particles are then spread on each layer of the spiral hollow ramp (21); Step 3, the motor (3) is controlled to rotate in the reverse direction again, so that the cylinder rotates clockwise. With the help of the hydraulic effect generated by the rotation of the cylinder and the movement of the solution, the bottom of the movable baffle (212) is washed 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), and 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 rotation of the solution; 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.

8. The method for harmless treatment of coal gangue for artificial soil according to claim 7, characterized in that: In the fourth step, 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 body rotates counterclockwise again, and the hydraulic force generated by the rotation of the cylinder body 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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