Tailings deep thickener and control method

Abstract

The application provides a tailings deep thickening device and a control method. The device comprises a container including a connected cylindrical bin body and a conical bin bottom; a feeding assembly arranged at the top of the container and used for providing tailings slurry and flocculating agent to the container; a stirring assembly arranged in the container and used for stirring flocculation groups; a pneumatic power thickening unit arranged outside the container and communicated with the conical bin bottom; a hydrodynamic power thickening unit arranged outside the container and communicated with the conical bin bottom; a slurry discharge pipe communicated with the bottom of the conical bin bottom; and a underflow circulating unit having one end communicated with the slurry discharge pipe and the other end communicated with the conical bin bottom and used for transferring slurry in the slurry discharge pipe to the container again for circulation. The tailings deep thickening device and the control method provided by the application have the advantages of simple structure, convenient operation, avoidance of phenomena such as blockage, hardening and pressure rake of the deep thickening device, reduction of operation and maintenance cost, reduction of requirements for the concentration of the ore slurry, and great improvement of the tailings treatment capacity.

Description

Technical Field

[0001] This application relates to the field of tailings treatment technology, and in particular to a tailings deep thickening device and control method. Background Technology

[0002] In the mining sector, backfilling mining can make full use of bulk solid waste, effectively improve the underground environment, increase ore recovery rate, reduce surface deformation, and enhance mine safety, making it an inevitable trend in green mining. Especially in recent years, with the continuous advancement of backfilling materials, processes, and equipment, backfilling mining has been widely applied in non-ferrous metal and precious metal mines.

[0003] Tailings gravity thickening is the first step in the backfilling process. However, as the particle size of tailings grinding becomes increasingly fine, the difficulty of tailings gravity thickening also increases. The main equipment for tailings gravity thickening is the vertical sand silo, but vertical sand silos often suffer from poor flocculation and sedimentation effects and low bottom sand concentration. The nozzles installed inside the sand silo become clogged after prolonged operation, losing their slurry-making ability. This causes the slurry to harden at the bottom of the sand silo, making it difficult to clean. The concentration of the backfill slurry cannot be kept stable, which seriously affects mine production.

[0004] Deep cone thickeners are used in some technologies as gravity thickening equipment for tailings. They are widely used due to their advantages such as high concentration of thickened bottom sand, high thickening efficiency, and simple process. However, deep cone thickeners often experience rake pressing and caking during operation. In the process of developing this application, it was found that when the mud layer height or concentration inside the deep cone thickener is high, the torque on the rake frame is very large, leading to rake pressing and equipment damage. This is especially true when thickening ultrafine tailings slurry, where slurry caking on the inner wall occurs, preventing the formation of a uniform and stable fluidized zone. This results in large fluctuations in discharge concentration, reduced equipment efficiency, high energy consumption, and high operating costs. Therefore, there is an urgent need for a deep tailings thickening device that can efficiently improve the rake pressing and caking phenomena. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a tailings depth thickening device and control method to solve the above-mentioned technical problems.

[0006] A first aspect of this application provides a tailings deep thickening device, comprising: a container including a cylindrical body and a conical bottom connected together; a feeding assembly disposed at the top of the container for supplying tailings slurry and flocculant to the container; a stirring assembly disposed inside the container for stirring the flocs; a pneumatic slurry-making unit disposed outside the container and connected to the conical bottom for supplying airflow into the container to agitate the flocs; a hydrodynamic slurry-making unit disposed outside the container and connected to the conical bottom for supplying water flow into the container to agitate the flocs; a slurry discharge pipe connected to the bottom of the conical bottom for discharging slurry; and an underflow circulation unit, one end connected to the slurry discharge pipe and the other end connected to the conical bottom for transferring the slurry in the slurry discharge pipe back into the container for circulation.

[0007] Furthermore, the cylindrical silo is a transparent silo with multiple sampling tubes connected to its side walls; the feeding assembly includes a support set at the top of the cylindrical silo, a feeding cylinder in the middle of the support, and a feed pipe connected to the side wall of the feeding cylinder; the stirring assembly includes a connected motor and a rake frame, the motor being mounted on the support and the rake frame penetrating the feeding cylinder.

[0008] Furthermore, the pneumatic pulping unit includes an air inlet main pipe connected to multiple parallel air inlet ring pipes. Each air inlet ring pipe is connected to the conical silo bottom at multiple points. The air inlet main pipe is equipped with an air compressor and an air inlet main valve. Each air inlet ring pipe is connected to the conical silo bottom at multiple points. The hydrodynamic pulping unit includes a water inlet main pipe connected to multiple parallel water inlet ring pipes. Each water inlet ring pipe is connected to the conical silo bottom at multiple points. The water inlet main pipe is equipped with a water pump and an water inlet main valve. Each water inlet ring pipe is connected to the conical silo bottom at multiple points. The underflow circulation unit includes a low-level circulation branch and a high-level circulation branch connected in parallel. The discharge pipe is equipped with a discharge pump and a discharge valve. Each of the low-level circulation branch and the high-level circulation branch is equipped with a circulation valve.

[0009] A second aspect of this application provides a control method for a tailings deep thickening device, using the tailings deep thickening device as described in the first aspect above. The control method for the tailings deep thickening device includes: turning on the stirring assembly; continuously injecting tailings slurry and flocculant into the container through the feeding assembly to obtain the mud layer height and bottom sand concentration in the container; and sequentially turning on the pneumatic slurry unit, the hydrodynamic slurry unit, and the underflow circulation unit according to the mud layer height and the bottom sand concentration.

[0010] Furthermore, the control method of the tailings deep thickening device also includes: when the bottom sand concentration is greater than a first preset concentration, the slurry discharge pipe is opened.

[0011] Further, the step of sequentially activating the pneumatic pulping unit, the hydrodynamic pulping unit, and the underflow circulation unit based on the mud layer height and the bottom sand concentration includes: increasing the actual torque value of the mixing component when the mud layer height is greater than a first preset height; after increasing the actual torque value, activating the pneumatic pulping unit when the actual torque value is greater than a preset torque value; after activating the pneumatic pulping unit, increasing the actual pneumatic power of the pneumatic pulping unit when the bottom sand concentration is greater than a second preset concentration, wherein the second preset concentration is greater than the first preset concentration; after increasing the actual pneumatic power, when the mud layer height is greater than a first preset height, increasing the actual pneumatic power of the pneumatic pulping unit when the bottom sand concentration is greater than a second preset concentration; and after increasing the actual pneumatic power, when the bottom sand concentration is greater than a second preset concentration, increasing the actual pneumatic power of the pneumatic pulping unit when the bottom sand concentration is greater than a second preset concentration. When the actual wind power is greater than the preset wind power, the hydrodynamic pulping unit is turned on and the wind-driven pulping unit is turned off; after the hydrodynamic pulping unit is turned on, when the bottom sand concentration is greater than the second preset concentration, the actual hydrodynamic power of the hydrodynamic pulping unit is increased; after the actual hydrodynamic power is increased, when the actual hydrodynamic power is greater than the first preset hydrodynamic power, the wind-driven pulping unit is turned on again; after both the wind-driven pulping unit and the hydrodynamic pulping unit are turned on, when the mud layer height is greater than the second preset height, the underflow circulation unit is turned on, wherein the second preset height is greater than the first preset height.

[0012] Furthermore, after increasing the actual hydrodynamic power, when the actual hydrodynamic power is greater than the first preset hydrodynamic power, the wind-powered slurry-making unit is restarted, which then includes: when the bottom sand concentration is greater than the second preset concentration, continuing to increase the actual hydrodynamic power; after continuing to increase the actual hydrodynamic power, when the actual hydrodynamic power is greater than the second preset hydrodynamic power, reducing the slurry discharge power of the slurry discharge pipe, wherein the second preset hydrodynamic power is greater than the first preset hydrodynamic power.

[0013] Furthermore, the wind-powered pulping unit includes three parallel air inlet ring pipes. Activating the wind-powered pulping unit includes: activating the lowest-level air inlet ring pipe; increasing the actual wind power of the wind-powered pulping unit when the substrate sand concentration is greater than the second preset concentration includes: increasing the actual wind power and activating the middle-level air inlet ring pipe when the substrate sand concentration is greater than the second preset concentration; after activating the middle-level air inlet ring pipe, increasing the actual wind power again and activating the highest-level air inlet ring pipe when the substrate sand concentration is greater than the second preset concentration; and after activating the highest-level air inlet ring pipe, increasing the actual wind power again when the substrate sand concentration is greater than the second preset concentration.

[0014] Furthermore, the hydrodynamic pulping unit includes three parallel inlet ring pipes. Activating the hydrodynamic pulping unit includes: activating the lowest inlet ring pipe; increasing the actual hydrodynamic power of the hydrodynamic pulping unit when the substrate sand concentration is greater than the second preset concentration includes: increasing the actual hydrodynamic power and activating the middle inlet ring pipe when the substrate sand concentration is greater than the second preset concentration; after activating the middle inlet ring pipe, increasing the actual hydrodynamic power again and activating the highest inlet ring pipe when the substrate sand concentration is greater than the second preset concentration; and after activating the highest inlet ring pipe, increasing the actual hydrodynamic power again when the substrate sand concentration is greater than the second preset concentration.

[0015] Furthermore, the circulation unit includes a low-level circulation branch and a high-level circulation branch connected in parallel. The step of activating the underflow circulation unit when the mud layer height is greater than the second preset height includes: activating the low-level circulation branch and increasing the discharge power of the discharge pipe when the mud layer height is greater than the second preset height; after activating the low-level circulation branch, activating the high-level circulation branch and increasing the discharge power again when the mud layer height is greater than the second preset height.

[0016] As can be seen from the above description, this application provides a tailings deep thickening device and control method. The device includes: a container, comprising a connected cylindrical body and a conical bottom; a feeding assembly, disposed at the top of the container, for supplying tailings slurry and flocculant to the container, wherein the tailings slurry and flocculant react within the container to form flocs; a stirring assembly, disposed within the container, for stirring the flocs; a pneumatic slurry unit, disposed outside the container and connected to the conical bottom, for supplying airflow into the container to agitate the flocs; and a hydrodynamic slurry unit, disposed outside the container and connected to the conical bottom, for supplying water flow into the container to agitate the flocs. By setting up the pneumatic and hydrodynamic slurry units, the flocs at the bottom can be agitated to form a fluidized slurry, which can prevent excessive settling of tailings, avoid rakeing and slurry caking, and the hydrodynamic slurry unit can reduce... The device features a low bottom sand concentration, further preventing slurry clogging. A discharge pipe, connected to the bottom of the conical silo, discharges the slurry. An underflow circulation unit, connected at one end to the discharge pipe and at the other to the conical silo, transfers the slurry from the discharge pipe back into the container for circulation, reducing the mud layer height and further preventing slurry clogging and hardening. This device eliminates the need for nozzles, avoiding nozzle blockage. Through the coordinated operation of the underflow circulation unit with the pneumatic and hydrodynamic slurry units, the bottom sand concentration is quickly and effectively controlled, efficiently preventing hardening and clogging. This tailings deep thickening device and control method is simple in structure and easy to operate, effectively avoiding nozzle blockage, hardening, and clogging in deep thickening devices. It reduces operation and maintenance costs, lowers the requirements for slurry concentration, greatly improves tailings processing capacity, and makes thickening operations more widespread and refined. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a tailings deep thickening device according to an embodiment of this application;

[0019] Figure 2 This is an enlarged structural schematic diagram of the feeding assembly in the embodiments of this application;

[0020] Figure 3 This is a top view of the conical hopper bottom in an embodiment of this application.

[0021] Figure 4 This is a schematic flowchart illustrating a control method for a tailings depth thickening device according to an embodiment of this application.

[0022] Reference numerals: 1. Container; 1-1. Cylindrical bin body; 1-2. Conical bin bottom; 1-3. Sampling tube; 2. Feeding assembly; 2-1. Support; 2-2. Feed cylinder; 2-3. Feed pipe; 2-4. Feed pump; 3. Mixing assembly; 3-1. Motor; 3-2. Rake frame; 4. Pneumatic pulping unit; 4-1. Main air inlet pipe; 4-2. Air inlet ring pipe; 4-3. Air compressor; 4 -4. Main air inlet valve; 4-5. Branch air inlet valve; 5. Hydrodynamic slurry making unit; 5-1. Main water inlet pipe; 5-2. Water inlet ring pipe; 5-3. Water pump; 5-4. Main water inlet valve; 5-5. Branch water inlet valve; 6. Slurry discharge pipe; 6-1. Slurry discharge pump; 6-2. Slurry discharge valve; 7. Underflow circulation unit; 7-1. Low-level circulation branch; 7-2. High-level circulation branch; 7-3. Circulation valve. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0024] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] In the mining sector, backfilling mining can make full use of bulk solid waste, effectively improve the underground environment, increase ore recovery rate, reduce surface deformation, and enhance mine safety, making it an inevitable trend in green mining. Especially in recent years, with the continuous advancement of backfilling materials, processes, and equipment, backfilling mining has been widely applied in non-ferrous metal and precious metal mines.

[0026] Tailings gravity thickening is the first step in the backfilling process. However, as the particle size of tailings grinding becomes increasingly fine, the difficulty of tailings gravity thickening also increases. The main equipment for tailings gravity thickening is the vertical sand silo, but vertical sand silos often suffer from poor flocculation and sedimentation effects and low bottom sand concentration. The nozzles installed inside the sand silo become clogged after prolonged operation, losing their slurry-making ability. This causes the slurry to harden at the bottom of the sand silo, making it difficult to clean. The concentration of the backfill slurry cannot be kept stable, which seriously affects mine production.

[0027] Deep cone thickeners are used in some technologies as gravity thickening equipment for tailings. They are widely used due to their advantages such as high concentration of thickened bottom sand, high thickening efficiency, and simple process. However, deep cone thickeners often experience rake pressing and caking during operation. In the process of developing this application, it was found that when the mud layer height or concentration inside the deep cone thickener is high, the torque on the rake frame is very large, leading to rake pressing and equipment damage. This is especially true when thickening ultrafine tailings slurry, where slurry caking on the inner wall occurs, preventing the formation of a uniform and stable fluidized zone. This results in large fluctuations in discharge concentration, reduced equipment efficiency, high energy consumption, and high operating costs. Therefore, there is an urgent need for a deep tailings thickening device that can efficiently improve the rake pressing and caking phenomena.

[0028] The following describes specific embodiments in conjunction with... Figures 1 to 4 The technical solution of this application will be described in detail below.

[0029] Some embodiments of this application provide a tailings depth thickening device, such as... Figure 1 As shown, the container includes: a container 1, comprising a connected cylindrical silo body 1-1 and a conical silo bottom 1-2; a feeding assembly 2, disposed at the top of the container 1, for supplying tailings slurry and flocculant to the container 1; a stirring assembly 3, disposed inside the container 1, for stirring the tailings slurry and the flocculant to form flocs; a pneumatic slurry-making unit 4, disposed outside the container 1 and connected to the conical silo bottom 1-2, for supplying airflow into the container 1 to agitate the flocs; a hydrodynamic slurry-making unit 5, disposed outside the container 1 and connected to the conical silo bottom 1-2, for supplying water flow into the container 1 to agitate the flocs; a slurry discharge pipe 6, connected to the bottom of the conical silo bottom 1-2, for discharging slurry; and an underflow circulation unit 7, one end connected to the slurry discharge pipe 6 and the other end connected to the conical silo bottom 1-2, for transferring the slurry in the slurry discharge pipe 6 back into the container 1 for circulation.

[0030] Container 1 includes a connected cylindrical hopper body 1-1 and a conical hopper bottom 1-2.

[0031] Feeding component 2, located at the top of container 1, is used to supply tailings slurry and flocculant to container 1. The tailings slurry and flocculant react in container 1 to form flocs. The mass fraction of tailings slurry used in the experiment is 15%-30%.

[0032] The stirring component 3 is installed inside the container 1 and is used to stir the flocs. Under the stirring action, the reaction between the flocculant and the slurry particles is more complete, the speed of floc formation is greatly improved, the settling rate is increased, the amount of flocculant used is reduced, the cost is reduced, and the filling efficiency is guaranteed.

[0033] A pneumatic slurry-making unit 4 is located outside the container 1 and connected to the conical silo bottom 1-2. It is used to provide airflow into the container 1 to agitate the flocs. A hydrodynamic slurry-making unit 5 is located outside the container 1 and connected to the conical silo bottom 1-2. It is used to provide water flow into the container 1 to agitate the flocs. By setting up the pneumatic slurry-making unit 4 and the hydrodynamic slurry-making unit 5, the flocs at the bottom can be agitated to form fluidized slurry, which can prevent excessive settling of tailings, avoid rakeing and slurry caking, and the hydrodynamic slurry-making unit 5 can reduce the concentration of bottom sand, further avoiding rakeing.

[0034] The slurry discharge pipe 6 is connected to the bottom of the conical bin bottom 1-2 and is used to discharge slurry.

[0035] The bottom flow circulation unit 7 is connected to the slurry discharge pipe 6 at one end and to the conical bin bottom 1-2 at the other end. It is used to transfer the slurry in the slurry discharge pipe 6 back to the container 1 for circulation. This can reduce the mud layer height and further avoid rakeing and slurry caking.

[0036] This device eliminates the use of nozzles, avoiding nozzle clogging. Through the linkage and cooperation of the underflow circulation unit 7 with the wind-powered pulping unit 4 and the hydro-powered pulping unit 5, pulping can be carried out under various external power sources, which can quickly and effectively control the concentration of bottom sand and effectively prevent caking and rakeing.

[0037] This tailings deep thickening device has a simple structure and is easy to operate. It effectively avoids problems such as nozzle blockage, caking, and rake pressing in deep thickening devices, reduces operation and maintenance costs, lowers the requirements for slurry concentration, greatly improves tailings processing capacity, and makes thickening operations more widespread and refined.

[0038] In some embodiments, such as Figure 1 and Figure 2As shown, the cylindrical silo 1-1 is a transparent silo, and multiple sampling tubes 1-3 are connected to its side walls; the feeding assembly 2 includes a support 2-1 set at the top of the cylindrical silo 1-1, a feeding cylinder 2-2 is provided in the middle of the support 2-1, and a feed pipe 2-3 is connected to the side wall of the feeding cylinder 2-2; the stirring assembly 3 includes a motor 3-1 and a rake frame 3-2 connected to it, the motor 3-1 is set on the support 2-1, and the rake frame 3-2 passes through the feeding cylinder 2-2.

[0039] The cylindrical silo 1-1 is formed by connecting multiple sections of transparent acrylic tubes with bolts. The transparent silo body facilitates observation of the tailings settling effect. The side wall of the cylindrical silo 1-1 is marked with graduations for easy reading of the mud layer height. The height of the cylindrical silo 1-1 can be adjusted by setting different numbers of acrylic tubes according to different experimental requirements. The height of each section of acrylic tube can be 220mm-270mm. Multiple sampling tubes 1-3 at different heights can be set on the side wall of the cylindrical silo 1-1. Each sampling tube 1-3 is equipped with a valve for easy sampling and testing of the slurry concentration at different heights. The slurry concentration measured through the lowest sampling tube 1-3 is the bottom sand concentration.

[0040] The conical silo bottom is formed by welding steel plates and can be detachably connected to the cylindrical silo body 1-1 via a flange. No nozzles are installed inside. The cone angle can be 60°, 90° or 120°, and can be changed according to needs. Tests have shown that the device with a 60° cone angle has higher thickening efficiency and does not have caking or rake-like phenomena.

[0041] The feeding assembly 2 includes a support 2-1 set on the top of the cylindrical silo 1-1. The support 2-1 is composed of two opposing I-beams and is connected to the cylindrical silo 1-1 using silicone structural adhesive. A feeding cylinder 2-2 is provided in the middle of the support 2-1. The bottom of the feeding cylinder 2-2 is provided with a flared opening for easy feeding. A feed pipe 2-3 is connected to the side wall of the feeding cylinder 2-2. A feed pump 2-4 is provided on the feed pipe 2-3 for pumping tailings slurry and flocculant into the feeding cylinder 2-2.

[0042] The mixing assembly 3 includes a motor 3-1 and a rake frame 3-2 connected by a drive. The motor 3-1 is mounted on the support 2-1, and the rake frame 3-2 passes through the feed cylinder 2-2. The motor 3-1 is used to control the rotation of the rake frame 3-2. The rake frame 3-2 has evenly distributed spiral blades on the drive shaft inside the feed cylinder 2-2 to make the tailings slurry and flocculant evenly mixed. The rake frame 3-2 is composed of longitudinal and transverse water guide rods. The water guide rods are made of steel and are fixedly connected by clamps. The diameter of the water guide rods is 2mm-6mm and the interval is 38.5mm-42.5mm. The bottom of the rake frame 3-2 is equipped with a scraper to prevent the slurry from caking at the bottom of the conical bin 1-2. The rake frame 3-2 can cut the flocs.

[0043] In some embodiments, such as Figure 1 and Figure 3 As shown, the pneumatic pulping unit 4 includes an air inlet main duct 4-1, which is connected to multiple parallel air inlet ring ducts 4-2. Each layer of the air inlet ring duct 4-2 is connected to the conical silo bottom 1-2 at multiple points. An air compressor 4-3 and an air inlet main valve 4-4 are installed on the air inlet main duct 4-1. An air inlet branch valve 4-5 is installed at the connection point between each layer of the air inlet ring duct 4-2 and the conical silo bottom 1-2. The hydrodynamic pulping unit 5 includes a water inlet main duct 5-1, which is connected to multiple parallel water inlet ring ducts 5-2. Each layer of the air inlet ring duct 4-2 is connected to the conical silo bottom 1-2 at multiple points. The inlet ring pipe 5-2 is connected to the conical bottom 1-2 at multiple points. The main inlet pipe 5-1 is equipped with a water pump 5-3 and an inlet main valve 5-4. Each layer of the inlet ring pipe 5-2 is equipped with an inlet branch valve 5-5 at the connection point between it and the conical bottom 1-2. The bottom flow circulation unit 7 includes a low-level circulation branch 7-1 and a high-level circulation branch 7-2 connected in parallel. The slurry discharge pipe 6 is equipped with a slurry discharge pump 6-1 and a slurry discharge valve 6-2. The low-level circulation branch 7-1 and the high-level circulation branch 7-2 are each equipped with a circulation valve 7-3.

[0044] The wind-powered pulping unit 4 includes an air inlet main duct 4-1, which is connected to multiple parallel air inlet ring ducts 4-2, such as... Figure 1 The diagram shows three layers of air inlet ring pipes 4-2, with a vertical spacing of 40mm-50mm between adjacent air inlet ring pipes 4-2. The air inlet ring pipes 4-2 are connected to the conical silo bottom 1-2 at multiple points, as shown below. Figure 3 As shown, the air inlet ring pipe 4-2 is inclinedly connected to the conical silo bottom 1-2 through 6 branch pipes, and the distance between adjacent branch pipes is 210mm-240mm to form a circulation; the main air inlet pipe 4-1 is equipped with an air compressor 4-3 and an air inlet main valve 4-4, and at the connection between each layer of air inlet ring pipe 4-2 and the conical silo bottom 1-2, i.e., on the branch pipe, an air inlet branch valve 4-5 is provided.

[0045] The hydrodynamic pulping unit 5 is structurally similar to the pneumatic pulping unit 4. It includes a main inlet pipe 5-1, which is connected to multiple parallel inlet ring pipes 5-2. Each inlet ring pipe 5-2 is connected to the conical silo bottom 1-2 at multiple points. A water pump 5-3 and a main inlet valve 5-4 are installed on the main inlet pipe 5-1. Inlet branch valves 5-5 are installed at the connection points between each inlet ring pipe 5-2 and the conical silo bottom 1-2. Figure 1 As shown, a three-layer water inlet ring pipe 5-2 is also installed. The water inlet ring pipe 5-2 and the air inlet ring pipe 4-2 are installed on the same layer, as shown. Figure 3 As shown, the air inlet ring pipe 4-2 on the same floor is located outside the water inlet ring pipe 5-2 and they are not connected to each other.

[0046] By setting up multi-layer ring pipes, slurry can be made at different heights. By activating the pneumatic slurry making unit 4 and / or the hydrodynamic slurry making unit 5, a fluidized zone can be continuously and stably formed. Under the cutting action of the water guide rods of the rake frame 3-2, the water in the flocs will overflow along the drainage channel. The drainage is accelerated by the intake of air and / or water, providing the upward power and channel for water molecules, and enabling the mortar to flow continuously and uniformly as a whole, which is convenient for slurry making. Especially when the bottom sand concentration is high, it provides the fluidization power for tailings particles and flocs, which can prevent excessive settling of tailings, resulting in caking and rake pressing.

[0047] like Figure 1 As shown, the bottom flow circulation unit 7 includes a low-level circulation branch 7-1 and a high-level circulation branch 7-2 connected in parallel. The connection between the high-level circulation branch 7-2 and the conical silo bottom 1-2 is higher than the connection between the low-level circulation branch 7-1 and the conical silo bottom 1-2. The slurry discharge pipe 6 is equipped with a slurry discharge pump 6-1 and a slurry discharge valve 6-2. The low-level circulation branch 7-1 and the high-level circulation branch 7-2 are each equipped with a circulation valve 7-3. By setting up two layers of circulation branches, slurry can be circulated at different height positions.

[0048] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0049] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0050] Based on the same inventive concept, this application also provides a control method for a tailings deep thickening device, such as... Figure 4 As shown, using the tailings deep thickening device as described in any of the above embodiments, the method includes the following steps:

[0051] S1. Turn on the stirring component 3.

[0052] First, turn on motor 3-1 to drive the rake frame 3-2 to rotate, so that the tailings slurry and flocculant that subsequently enter container 1 can react fully.

[0053] S2. Tailings slurry and flocculant are continuously injected into the container 1 through the feeding component 2 to obtain the mud layer height and bottom sand concentration in the container 1.

[0054] Tailings slurry and flocculant are fed into the feed cylinder 2-2 via the feed pump 2-4, and then enter the container 1 through the rake frame 3-2. The tailings slurry and flocculant react to form flocs, which are then cut by the rake frame 3-2 to form water channels, causing the bottom sand concentration to increase continuously. During the experiment, the mud layer height and bottom sand concentration in the container 1 are acquired in real time. The mud layer height can be obtained manually by reading the scale on the cylindrical silo 1-1 every 1 minute, or by setting a mud layer height sensor for monitoring, or by acquiring a real-time image of the slurry in the container 1 and determining the mud layer height through an image recognition algorithm. No limitation is made here. The bottom sand concentration can be obtained by manually sampling through the bottom sampling tube 1-3 every 5 minutes and testing the sample concentration, or by setting a concentration sensor on the rake frame 3-2 for monitoring. No limitation is made here.

[0055] S3. Based on the mud layer height and the bottom sand concentration, sequentially activate the wind-powered slurry making unit 4, the hydrodynamic slurry making unit 5, and the underflow circulation unit 7.

[0056] Based on the mud layer height and bottom sand concentration, the pneumatic pulping unit 4, hydrodynamic pulping unit 5, and underflow circulation unit 7 are activated sequentially. When the mud layer height and bottom sand concentration are relatively low, the pneumatic pulping unit 4 is activated first to agitate the flocs, which does not change the bottom sand concentration and has low power consumption. When the bottom sand concentration is too high, the hydrodynamic pulping unit 5 is activated to quickly adjust the bottom sand concentration and avoid raking and caking. When the mud layer height is too high, the underflow circulation unit 7 is activated to quickly adjust the mud layer height and avoid raking and caking. This effectively improves raking and caking phenomena, increases energy utilization, and reduces operation and maintenance costs.

[0057] In some embodiments, the control method of the tailings depth thickening device further includes:

[0058] S4. When the concentration of the bottom sand is greater than the first preset concentration, the slurry discharge pipe 6 is opened.

[0059] The first preset concentration is, for example, 68%-72% (mass concentration), and there is no specific limit. When the concentration of the bottom sand is greater than the first preset concentration, it means that the slurry concentration meets the filling requirements, and the slurry pump 6-1 and the slurry valve 6-2 are turned on to discharge the slurry.

[0060] In some embodiments, step S3 includes:

[0061] S301. When the height of the mud layer is greater than the first preset height, increase the actual torque value of the stirring component 3.

[0062] The first preset height is, for example, 0.5m, but the specific value is not limited. It can be set to 1 / 2 of the height of the cylindrical silo 1-1. When the mud layer height is greater than the first preset height, the actual torque value of the stirring component 3 is increased, that is, the actual torque value of the motor 3-1 is increased. With the addition of tailings slurry and flocculant, flocs will continuously form in the container 1. The flocs settle at the bottom to form a mud layer. As the mud layer height increases, the rotational resistance of the rake frame 3-2 becomes greater and greater. Therefore, it is necessary to increase the actual torque value. The growth rate of the actual torque value is, for example, 1% / min, but the specific value is not limited. This ensures that the rake frame 3-2 rotates normally and avoids rake compression. For example, the rotation speed is controlled at 1-2 rad / min, so as not to disturb the water layer above too much and facilitate purification and circulation. When the mud layer height is less than the first preset height, the actual torque value of the stirring component 3 can be reduced to ensure the energy utilization rate of the device.

[0063] S302. After increasing the actual torque value, when the actual torque value is greater than the preset torque value, the wind-powered pulping unit 4 is turned on.

[0064] Generally, when motor 3-1 is first started, the actual torque value is about 5% of the maximum torque value of motor 3-1, such as 8-12 N*m. The preset torque value is, for example, 20% of the maximum torque value, and the specific value is not limited. After increasing the actual torque value of motor 3-1, when the actual torque value is greater than the preset torque value, the bottom sand concentration is still low, but the rakeing phenomenon is more serious. Turn on the air compressor 4-3 and the main air inlet valve 4-4 to perform pneumatic slurry making. Under the action of air compressor 4-3, the air will continuously disturb the flocs in the mud layer at the bottom of the device, avoid bottom caking, promote the formation of a fluidized area, and reduce the resistance of the rake. When the actual torque value is less than the preset torque value, the pneumatic slurry making unit 4 can be turned off to ensure the energy utilization rate of the device.

[0065] S303. After the wind-powered pulping unit 4 is turned on, when the concentration of the bottom sand is greater than the second preset concentration, the actual wind power of the wind-powered pulping unit 4 is increased, wherein the second preset concentration is greater than the first preset concentration.

[0066] When compressor 4-3 is initially started, the actual wind power is approximately 5% of its maximum wind power, which is 1.5kW-2.2kW. The second preset concentration is, for example, 75% (mass concentration), with no specific limit. As tailings slurry and flocculant are continuously added, the bottom sand concentration continues to increase. After starting compressor 4-3 and main air inlet valve 4-4, when the bottom sand concentration exceeds the second preset concentration, it indicates that the rake and caking phenomena are relatively serious, requiring further increase in actual wind power. The growth rate of actual wind power is, for example, 1% / min, with no specific limit. This step improves the fluidization level and further reduces the rake resistance. When the bottom sand concentration is less than the second preset concentration, the actual wind power can be reduced to ensure the energy utilization rate of the device.

[0067] S304. After increasing the actual wind power, when the actual wind power is greater than the preset wind power, the hydrodynamic pulping unit 5 is turned on and the wind-powered pulping unit 4 is turned off.

[0068] The preset wind power is, for example, 20% of the maximum wind power, and the specific value is not limited. After increasing the actual wind power, if the actual wind power is greater than the preset wind power, it indicates that the bottom sand concentration is too high, and the rake and caking phenomena are very serious. At this time, the water pump 5-3 and the main water inlet valve 5-4 are turned on, and the air compressor 4-3 and the main air inlet valve 4-4 are turned off to carry out hydraulic slurry making. By adding water, the bottom sand concentration can be reduced. At the same time, the water flow will disturb the flocs in the mud layer, avoid bottom caking, promote the formation of fluidized areas, and reduce the resistance of the rake. When the actual wind power is less than the preset wind power, the hydraulic slurry making unit 5 can be turned off and the wind power slurry making unit 4 can be turned on to ensure the energy utilization rate of the device.

[0069] S305. After the hydrodynamic pulping unit 5 is turned on, when the concentration of the bottom sand is greater than the second preset concentration, the actual hydrodynamic power of the hydrodynamic pulping unit 5 is increased.

[0070] Generally, when the water pump 5-3 is first started, the actual hydrodynamic power is about 5% of the maximum hydrodynamic power of the water pump 5-3, which is 200W-250W. As tailings slurry and flocculant are continuously added, the bottom sand concentration continues to increase. After starting the hydrodynamic slurry unit 5, when the bottom sand concentration is greater than the second preset concentration, it means that the bottom sand concentration is still high, and the rake and caking phenomena are more serious. It is necessary to further increase the actual hydrodynamic power. The growth rate of the actual hydrodynamic power is, for example, 1% / min, and the specific value is not limited. This step improves the fluidization degree and further reduces the rake resistance. When the bottom sand concentration is less than the second preset concentration, the actual hydrodynamic power can be reduced to ensure the energy utilization rate of the device.

[0071] S306. After increasing the actual hydrodynamic power, when the actual hydrodynamic power is greater than the first preset hydrodynamic power, the wind-powered pulping unit 4 is turned on again.

[0072] The first preset hydrodynamic power is, for example, 20% of the maximum hydrodynamic power, and the specific value is not limited. After increasing the actual hydrodynamic power, if the actual hydrodynamic power is greater than the first preset hydrodynamic power, it indicates that the bottom sand concentration is too high and the pressing and caking phenomena are very serious. In this case, the air compressor 4-3 and the main air inlet valve 4-4 are turned on again to carry out air-water linkage slurry making, further improving the fluidization degree and reducing the pressing resistance. When the actual hydrodynamic power is less than the first preset hydrodynamic power, the air-powered slurry making unit 4 can be turned off to ensure the energy utilization rate of the device.

[0073] S307. After both the wind-powered pulping unit 4 and the hydro-powered pulping unit 5 are turned on, when the mud layer height is greater than the second preset height, the underflow circulation unit 7 is turned on, wherein the second preset height is greater than the first preset height.

[0074] The second preset height is, for example, 0.8m, and is not specifically limited. It can be set to 4 / 5 of the height of the cylindrical silo 1-1. After both the air compressor 4-3 and the water pump 5-3 are turned on, when the mud layer height is greater than the second preset height, it means that too much slurry has accumulated in the container 1, and the material cannot be discharged for a long time or the slurry flow rate is slow. The air-water linkage slurry making capacity has reached its limit. At this time, the circulation valve 7-3 is opened to perform bottom flow circulation to transfer the slurry in the container 1. This can reduce the mud layer height and further prevent the slurry from being pressed and caking. When the mud layer height is less than the second preset height, the bottom flow circulation unit 7 can be turned off to ensure the energy utilization rate of the device.

[0075] In some embodiments, the steps following step S306 and before step S307 include:

[0076] S3061. When the bottom sand concentration is greater than the second preset concentration, the actual hydrodynamic power is further increased.

[0077] After the wind-water linkage slurry making is started, if the bottom sand concentration is greater than the second preset concentration, it means that the bottom sand concentration is high. Continue to increase the actual hydrodynamic power of the water pump 5-3. The growth rate of the actual hydrodynamic power is, for example, 1% / min, and the specific value is not limited, in order to reduce the bottom sand concentration and improve the pressing and caking. When the sand concentration is less than the second preset concentration, the actual hydrodynamic power can be reduced to ensure the energy utilization rate of the device.

[0078] S3062. After further increasing the actual hydrodynamic power, when the actual hydrodynamic power is greater than the second preset hydrodynamic power, reduce the discharge power of the discharge pipe 6, wherein the second preset hydrodynamic power is greater than the first preset hydrodynamic power.

[0079] The second preset hydrodynamic power is, for example, 40% of the maximum hydrodynamic power, and is not specifically limited. After the actual hydrodynamic power is increased, if the actual hydrodynamic power is greater than the second preset hydrodynamic power, it means that the bottom sand concentration is too high. The discharge power of the discharge pipe 6 is reduced to reduce the amount of water discharged, thereby reducing the bottom sand concentration. If the actual hydrodynamic power is less than the second preset hydrodynamic power, the discharge power of the discharge pipe 6 can be increased to ensure the energy utilization rate of the device.

[0080] In some embodiments, the wind-powered pulping unit 4 includes three parallel air inlet ring pipes 4-2, and activating the wind-powered pulping unit 4 includes:

[0081] S3021. Open the lowest layer air inlet ring pipe 4-2.

[0082] First, open the air inlet branch valve 4-5 of the lowest layer air inlet ring pipe 4-2. This will result in the lowest power consumption, and the actual wind power at this time will be, for example, 5% of the maximum wind power.

[0083] In some embodiments, increasing the actual wind power of the wind-powered slurry-making unit 4 when the sediment concentration is greater than a second preset concentration includes:

[0084] S3031. When the concentration of the substrate sand is greater than the second preset concentration, the actual wind power is increased, and the air inlet ring pipe 4-2 of the intermediate layer is opened.

[0085] After opening the lowest layer air inlet ring pipe 4-2, after a period of time, such as 1 minute, if the bottom sand concentration is greater than the second preset concentration, it indicates that the rake pressing is relatively serious. At this time, the actual wind power is increased, for example, to 10% of the maximum wind power, and the air inlet branch valve 4-5 of the middle layer air inlet ring pipe 4-2 is opened to increase the wind-powered slurry making capacity. When the bottom sand concentration is less than the second preset concentration, the actual wind power is reduced and the middle layer air inlet ring pipe 4-2 is closed to ensure the energy utilization rate of the device.

[0086] S3032. After opening the air inlet ring pipe 4-2 of the middle layer, when the concentration of the bottom sand is greater than the second preset concentration, the actual wind power is increased again, and the air inlet ring pipe 4-2 of the top layer is opened.

[0087] After opening the air inlet ring pipes 4-2 of the lowest and middle layers, after a period of time, such as 1 minute, if the bottom sand concentration is greater than the second preset concentration, it indicates that the rake pressing is relatively serious. At this time, increase the actual wind power, for example, to 15% of the maximum wind power, and open the air inlet branch valve 4-5 of the air inlet ring pipe 4-2 of the highest layer to increase the wind-powered slurry making capacity. When the bottom sand concentration is less than the second preset concentration, reduce the actual wind power and close the air inlet ring pipe 4-2 of the highest layer to ensure the energy utilization rate of the device.

[0088] S3033. After opening the air inlet ring pipe 4-2 at the top layer, when the concentration of the bottom sand is greater than the second preset concentration, the actual wind power is increased again.

[0089] After all three air inlet ring pipes 4-2 are opened, after a period of time, such as 1 minute, if the bottom sand concentration is greater than the second preset concentration, it indicates that the rake is severely compressed. At this time, the actual wind power is increased again, for example, to 20% of the maximum wind power, to increase the wind-powered slurry production capacity. When the bottom sand concentration is less than the second preset concentration, the actual wind power is reduced to ensure the energy utilization rate of the device.

[0090] By opening the air inlet ring pipe 4-2 layer by layer from low to high, energy utilization can be improved while reducing the effects of pressure and caking.

[0091] In some embodiments, the hydrodynamic pulping unit 5 includes three parallel inlet ring pipes 5-2, and starting the hydrodynamic pulping unit 5 includes:

[0092] S3041. Open the lowest layer of the water inlet ring pipe 5-2.

[0093] First, open the inlet branch valve 5-5 of the lowest layer inlet ring pipe 5-2. This will minimize power consumption. The actual hydrodynamic power at this time is, for example, 5% of the maximum hydrodynamic power.

[0094] In some embodiments, increasing the actual hydrodynamic power of the hydrodynamic slurry-making unit 5 when the sediment concentration is greater than the second preset concentration includes:

[0095] S3051. When the concentration of the bottom sand is greater than the second preset concentration, the actual hydrodynamic power is increased, and the water inlet ring pipe 5-2 of the intermediate layer is opened.

[0096] After opening the lowest layer inlet ring pipe 5-2, after a period of time, such as 1 minute, if the bottom sand concentration is greater than the second preset concentration, it indicates that the rake pressing is relatively serious. At this time, increase the actual hydrodynamic power, for example, to 10% of the maximum hydrodynamic power, and open the inlet branch valve 5-5 of the middle layer inlet ring pipe 5-2 to increase the hydraulic slurry making capacity. When the bottom sand concentration is less than the second preset concentration, reduce the actual hydrodynamic power and close the middle layer inlet ring pipe 5-2 to ensure the energy utilization rate of the device.

[0097] S3052. After opening the water inlet ring pipe 5-2 of the middle layer, when the bottom sand concentration is greater than the second preset concentration, the actual hydrodynamic power is increased again, and the water inlet ring pipe 5-2 of the highest layer is opened.

[0098] After opening the inlet ring pipes 5-2 of the lowest and middle layers, after a period of time, such as 1 minute, if the bottom sand concentration is greater than the second preset concentration, it indicates that the rake pressing is relatively serious. At this time, the actual hydrodynamic power is increased, for example, to 15% of the maximum hydrodynamic power, and the inlet branch valve 5-5 of the top layer inlet ring pipe 5-2 is opened to increase the hydraulic slurry making capacity. When the bottom sand concentration is less than the second preset concentration, the actual hydrodynamic power is reduced and the top layer inlet ring pipe 5-2 is closed to ensure the energy utilization rate of the device.

[0099] S3053. After opening the inlet ring pipe 5-2 of the highest layer, when the bottom sand concentration is greater than the second preset concentration, the actual hydrodynamic power is increased again.

[0100] After all three inlet ring pipes 5-2 are opened, after a period of time, such as 1 minute, if the bottom sand concentration is greater than the second preset concentration, it indicates that the rake is severely pressed. At this time, the actual hydrodynamic power is increased again, for example, to 20% of the maximum hydrodynamic power, to increase the hydraulic slurry making capacity. When the bottom sand concentration is less than the second preset concentration, the actual hydrodynamic power is reduced to ensure the energy utilization rate of the device.

[0101] By opening the inlet ring pipe 5-2 layer by layer from low to high, energy utilization can be improved while reducing the effects of rakeing and caking.

[0102] In some embodiments, the circulation unit includes a low-level circulation branch 7-1 and a high-level circulation branch 7-2 connected in parallel. The step of activating the underflow circulation unit 7 when the mud layer height is greater than a second preset height includes:

[0103] S3071. When the mud layer height is greater than the second preset height, the low-level circulation branch 7-1 is opened, and the slurry discharge power of the slurry discharge pipe 6 is increased.

[0104] When the mud layer height is greater than the second preset height, the circulation valve 7-3 of the low-level circulation branch 7-1 is opened first, and the discharge power of the discharge pipe 6 is increased. At the same time as the discharge, the mud layer height is reduced.

[0105] S3072. After the low-level circulation branch 7-1 is turned on, when the mud layer height is greater than the second preset height, the high-level circulation branch 7-2 is turned on, and the slurry discharge power is increased again.

[0106] After the low-level circulation branch 7-1 is opened, after a period of time, such as 1 minute, when the mud layer height is greater than the second preset height, it means that the mud layer height is still high. At this time, the circulation valve 7-3 of the high-level circulation branch 7-2 is opened, and the slurry discharge power is increased again. While discharging slurry, the mud layer height is further reduced.

[0107] By opening the circulation branches layer by layer from low to high, energy utilization can be improved while mitigating the effects of raking and compaction. When the mud layer height is less than the second preset height, the low-level circulation branch 7-1 and the high-level circulation branch 7-2 are closed.

[0108] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0109] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0110] Additionally, to simplify the description and discussion, and to avoid obscuring the embodiments of this application, well-known power / ground connections to other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be illustrated in block diagram form to avoid obscuring the embodiments of this application, and this also takes into account the fact that the details of implementation of these block diagram apparatuses are highly dependent on the platform on which the embodiments of this application will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details have been set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that the embodiments of this application may be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0111] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. The embodiments of this application are intended to cover all such substitutions, modifications, and variations falling within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A method for controlling a tailings depth thickening device, characterized in that, The tailings thickening device includes: a container comprising a connected cylindrical body and a conical bottom; a feeding assembly disposed at the top of the container for supplying tailings slurry and flocculant to the container; a stirring assembly disposed inside the container for stirring the flocs; a pneumatic slurry-making unit disposed outside the container and connected to the conical bottom for supplying airflow into the container to agitate the flocs; a hydrodynamic slurry-making unit disposed outside the container and connected to the conical bottom for supplying water flow into the container to agitate the flocs; a discharge pipe connected to the bottom of the conical bottom for discharging slurry; and an underflow circulation unit, one end connected to the discharge pipe and the other end connected to the conical bottom, for transferring the slurry in the discharge pipe back into the container for circulation. The control method for the tailings depth thickening device includes: Turn on the stirring assembly; The tailings slurry and flocculant are continuously injected into the container through the feeding assembly to obtain the mud layer height and bottom sand concentration in the container. Based on the mud layer height and the bottom sand concentration, the wind-powered slurry making unit, the hydro-powered slurry making unit, and the bottom flow circulation unit are activated sequentially. When the concentration of the substrate sand is greater than the first preset concentration, the slurry discharge pipe is opened; The step of sequentially activating the pneumatic pulping unit, the hydrodynamic pulping unit, and the underflow circulation unit based on the mud layer height and the bottom sand concentration includes: increasing the actual torque value of the mixing component when the mud layer height is greater than a first preset height; activating the pneumatic pulping unit when the actual torque value is greater than a preset torque value after increasing the actual torque value; activating the pneumatic pulping unit when the bottom sand concentration is greater than a second preset concentration after activating the pneumatic pulping unit, wherein the second preset concentration is greater than the first preset concentration; and activating the pneumatic pulping unit when the bottom sand concentration is greater than a second preset concentration after activating the pneumatic pulping unit. When the actual wind power is greater than the preset wind power, the hydrodynamic pulping unit is turned on and the wind-driven pulping unit is turned off; after the hydrodynamic pulping unit is turned on, when the bottom sand concentration is greater than the second preset concentration, the actual hydrodynamic power of the hydrodynamic pulping unit is increased; after the actual hydrodynamic power is increased, when the actual hydrodynamic power is greater than the first preset hydrodynamic power, the wind-driven pulping unit is turned on again; after both the wind-driven pulping unit and the hydrodynamic pulping unit are turned on, when the mud layer height is greater than the second preset height, the underflow circulation unit is turned on, wherein the second preset height is greater than the first preset height; The underflow circulation unit includes a low-level circulation branch and a high-level circulation branch connected in parallel. The step of activating the underflow circulation unit when the mud layer height is greater than a second preset height includes: activating the low-level circulation branch and increasing the discharge power of the discharge pipe when the mud layer height is greater than the second preset height; and activating the high-level circulation branch and increasing the discharge power again after activating the low-level circulation branch when the mud layer height is greater than the second preset height.

2. The control method for the tailings deep thickening device according to claim 1, characterized in that, After increasing the actual hydrodynamic power, when the actual hydrodynamic power exceeds the first preset hydrodynamic power, the wind-powered pulping unit is restarted, followed by: When the bottom sand concentration is greater than the second preset concentration, the actual hydrodynamic power is further increased; After further increasing the actual hydrodynamic power, when the actual hydrodynamic power is greater than the second preset hydrodynamic power, the discharge power of the discharge pipe is reduced, wherein the second preset hydrodynamic power is greater than the first preset hydrodynamic power.

3. The control method for the tailings deep thickening device according to claim 1, characterized in that, The wind-powered pulping unit includes three layers of parallel air inlet ring pipes. Opening the wind-powered pulping unit includes: opening the lowest layer of the air inlet ring pipes. When the concentration of the substrate sand is greater than the second preset concentration, increasing the actual wind power of the wind-powered slurry-making unit includes: When the concentration of the substrate sand is greater than the second preset concentration, the actual wind power is increased, and the air inlet ring pipe of the intermediate layer is opened; After opening the air inlet ring pipe of the middle layer, when the concentration of the bottom sand is greater than the second preset concentration, the actual wind power is increased again, and the air inlet ring pipe of the top layer is opened. After opening the air inlet ring pipe at the top layer, when the concentration of the bottom sand is greater than the second preset concentration, the actual wind power is increased again.

4. The control method for the tailings deep thickening device according to claim 1, characterized in that, The hydrodynamic pulping unit includes three layers of parallel inlet ring pipes. Opening the hydrodynamic pulping unit includes: opening the lowest layer of the inlet ring pipe. When the concentration of the substrate sand is greater than the second preset concentration, increasing the actual hydrodynamic power of the hydrodynamic slurry-making unit includes: When the concentration of the bottom sand is greater than the second preset concentration, the actual hydrodynamic power is increased, and the water inlet ring pipe of the intermediate layer is opened; After opening the water inlet ring pipe of the middle layer, when the bottom sand concentration is greater than the second preset concentration, the actual hydrodynamic power is increased again, and the water inlet ring pipe of the top layer is opened. After opening the inlet ring pipe at the top layer, when the bottom sand concentration is greater than the second preset concentration, the actual hydrodynamic power is increased again.

5. The control method for the tailings deep thickening device according to claim 1, characterized in that, The cylindrical chamber is transparent, and multiple sampling tubes are connected to its side walls; The feeding assembly includes a support set at the top of the cylindrical hopper, a feeding cylinder provided in the middle of the support, and a feed pipe connected to the side wall of the feeding cylinder; The mixing assembly includes a connected motor and a rake frame, the motor being mounted on the support and the rake frame passing through the feeding cylinder.

6. The control method for the tailings deep thickening device according to claim 1, characterized in that, The pneumatic pulping unit includes a main air inlet pipe, which is connected to multiple parallel air inlet ring pipes. Each air inlet ring pipe is connected to the bottom of the conical silo at multiple points. The main air inlet pipe is equipped with an air compressor and a main air inlet valve. Each air inlet ring pipe is equipped with an air inlet branch valve at the connection point between it and the bottom of the conical silo. The hydrodynamic pulping unit includes a main inlet pipe, which is connected to multiple parallel inlet ring pipes. Each inlet ring pipe is connected to the bottom of the conical silo at multiple points. The main inlet pipe is equipped with a water pump and a main inlet valve. Each inlet ring pipe is equipped with a branch inlet valve at the connection point between it and the bottom of the conical silo. The underflow circulation unit includes a low-level circulation branch and a high-level circulation branch connected in parallel. The slurry discharge pipe is equipped with a slurry discharge pump and a slurry discharge valve. A circulation valve is provided on the low-level circulation branch and the high-level circulation branch respectively.

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