A kind of eddy current forced size mixing device and size mixing method based on restricted space

Abstract

The application belongs to the technical field of mineral flotation, and particularly relates to a vortex forced pulp conditioning device and method based on a limited space. The device comprises a pulp conditioning cylinder, the bottom sidewall of the pulp conditioning cylinder is provided with a mineral inlet, and the top sidewall is provided with a mineral outlet. The mineral inlet comprises at least two oppositely arranged inlet pipelines, so that the mineral pulp enters the pulp conditioning cylinder in the form of a collision flow. The mineral inlet of the device is connected with a pulp distribution groove, and the pulp distribution groove is a closed pipeline arranged around the outer sidewall of the pulp conditioning cylinder. The pulp distribution groove is connected with pulp distribution pipes matched with the number of the inlet pipelines. After the pulp enters the pulp distribution groove, the pulp flows to the inlet pipelines through the pulp distribution pipes to strengthen the collision. The collision induces shear to strengthen the mixing of particles and reagents, and then the pulp enters the upper part of the pulp conditioning cylinder from bottom to top. Under the action of small-scale turbulent micro-vortices induced by the pulp conditioning impeller stirring, the adsorption of the flotation reagents on the surface of the mineral particles is promoted, and the pulp conditioning of the fine particles is realized.

Description

Technical Field

[0001] This invention belongs to the field of mineral flotation technology, specifically relating to a vortex forced slurry conditioning device and method based on a confined space. Background Technology

[0002] Flotation is an effective method for separating fine-grained minerals and has been widely used in energy, resources, and chemical industries. Flotation uses air bubbles as a carrier and leverages the difference in hydrophobicity between particle surfaces to separate valuable minerals from gangue minerals in a complex gas-liquid-solid three-phase system. Before flotation, slurry pretreatment can homogenize the dispersion of mineral particles and reagents, promote reagent adsorption on the particle surface, increase the difference in hydrophobicity between target and non-target minerals, thereby modifying the particle surface and creating favorable interfacial conditions for the flotation process, thus improving flotation recovery efficiency and capacity.

[0003] Low-quality mineral resources generally share the common characteristics of being "poor, fine-grained, and complex," with complex surface properties and poor hydrophobicity, making them difficult to effectively separate by flotation. Therefore, surface modification is increasingly important. Enhancing the interaction between particles and reagents to provide favorable interfaces and mineralization conditions for the flotation of poor, fine, and complex minerals is a prerequisite and necessary condition for achieving efficient separation of low-quality minerals. Numerous studies have shown that, under certain conditions, a fluid-scale effect exists during flotation slurry conditioning. That is, the stronger the turbulence, the greater the turbulent dissipation, and the smaller the turbulent eddy size, the more conducive it is to forcing reagents to collide and adsorb on the surface of fine particles, resulting in better slurry conditioning of fine particles.

[0004] Therefore, there is an urgent need to design a new type of strong turbulence enhanced flotation slurry conditioning device to achieve efficient surface modification of fine-grained minerals and improve the flotation recovery efficiency and capacity of fine-grained minerals. Summary of the Invention

[0005] To address the aforementioned technical problems, one objective of this invention is to provide a vortex-forced slurry conditioning device based on a confined space.

[0006] The present invention adopts the following technical solution:

[0007] A confined space-based eddy current forced slurry conditioning device includes a slurry conditioner body with a slurry conditioning cylinder inside. The bottom side wall of the slurry conditioning cylinder has an inlet, and the top side wall has an outlet, forming a slurry conditioning pipeline running from bottom to top within the cylinder. The inlet includes at least two opposing inlet pipes, allowing the mineral slurry to enter the slurry conditioning cylinder in a collision flow manner. The inlet end of the inlet is connected to a slurry distribution tank, which is a closed pipe surrounding the outer wall of the slurry conditioning cylinder, positioned near the outlet. The slurry distribution tank is connected to slurry distribution pipes, the number of which matches the number of inlet pipes. After entering the slurry distribution tank, the slurry flows through the distribution pipes to the inlet pipes to enhance collision.

[0008] Preferably, the device further includes a stirring device disposed inside the slurry preparation cylinder. The stirring device has a slurry preparation impeller for stirring, and the slurry preparation impeller is disposed above the collision flow path between the inlet pipes.

[0009] Preferably, a small-diameter inner-lined jet pipe is provided at the connection between the inlet pipe and the slurry preparation cylinder. The inner-lined jet pipe extends a set distance into the slurry preparation cylinder through the side wall of the slurry preparation cylinder to enhance the collision.

[0010] Preferably, the small-diameter inner-lined jet pipe is specifically: the diameter of the inner-lined jet pipe is 1 / 4 to 3 / 4 of the diameter of the inlet pipe.

[0011] Preferably, the inner wall of the slurry distribution pipe is further provided with spiral blades at intervals, the width of the spiral blades being 1 / 4 to 1 / 2 of the diameter of the slurry distribution pipe, and the height of a single spiral blade being 1 / 2 of the width of the spiral blade.

[0012] Preferably, the preparation cylinder has horizontally arranged annular plates inside, the edges of which are tightly connected to the inner wall of the preparation cylinder, and the central hole of the annular plates is used for slurry flow; several annular plates divide the preparation cylinder into interconnected compartments to accommodate different stages of the mixing and adsorption process between mineral particles and flotation reagents inside the preparation cylinder.

[0013] Preferably, the first annular plate is disposed between the ore inlet and the slurry conditioning impeller, and the first annular plate and the bottom of the slurry conditioning cylinder form a collision flow slurry conditioning chamber; the second annular plate is disposed near the ore outlet and below the ore outlet, and the second annular plate and the top of the slurry conditioning cylinder form a slurry discharge chamber.

[0014] Preferably, a central annular plate is also provided between the second annular plate and the slurry adjusting impeller. The central annular plate and the second annular plate form a dispersed circulation slurry adjusting chamber, and the central annular plate and the first annular plate form a vortex forced slurry adjusting chamber.

[0015] Preferably, the impeller is a semi-open radial impeller with vertically arranged blades, so that the fluid moves in a horizontal plane after being agitated.

[0016] Preferably, the stirring device further includes a dispersing and circulating impeller, which is disposed in the dispersing and circulating slurry chamber.

[0017] Preferably, the dispersing circulation impeller is an open axial downward pressure flow impeller, that is, the blades are inclined and the stirring provides axial kinetic energy to the fluid.

[0018] Preferably, the diameter of the central hole of the first annular plate is less than or equal to the diameter of the inlet of the slurry adjusting impeller, and the diameter of the central hole of both the central annular plate and the second annular plate is greater than the diameter of the blades of the slurry adjusting impeller and the diameter of the blades of the dispersing circulation impeller.

[0019] Preferably, baffles are provided on the upper surface of the first annular plate and the lower surface of the second annular plate. Several baffles are arranged radially around the central hole of the annular plate. One long side of the baffle is attached to the inner wall of the slurry mixing cylinder, and the width of the baffle is shorter than the annular ring width of the annular plate.

[0020] Preferably, the baffle on the upper surface of the first annular plate extends upward beyond the top surface of the slurry adjusting impeller, and the baffle on the lower surface of the second annular plate extends downward beyond the bottom surface of the dispersing circulation impeller.

[0021] Preferably, the upper and lower surfaces of the central annular plate are provided with lining plates, which are arranged radially around the central hole of the central annular plate. One long side of the lining plate is attached to the inner wall of the slurry mixing cylinder, and the width of the lining plate is shorter than the annular width of the central annular plate.

[0022] Preferably, 4 to 8 baffles are evenly arranged around the central hole of the annular plate.

[0023] Preferably, 4 to 8 liner plates are evenly arranged around the central hole of the annular plate.

[0024] Preferably, the top of the slurry mixing cylinder is sealed by a sealing cover plate, and the bottom of the slurry mixing cylinder is also provided with a discharge pipe for discharging residual slurry.

[0025] Preferably, the eddy current slurry conditioner is also connected to a power unit, which is electrically connected to the stirring device in the eddy current slurry conditioner.

[0026] Preferably, the power unit is a drive motor, which is mounted on a sealing cover plate at the top of the slurry mixing cylinder.

[0027] The second objective of this invention is to provide a slurry conditioning method for the aforementioned eddy current slurry conditioning device based on a confined space, the method comprising the following steps:

[0028] S1. When the slurry preparation begins, close the discharge pipe. The mineral particles and flotation reagents enter the slurry preparation cylinder from the inlet through the inlet pipe in the form of a collision flow. After the slurry in the slurry preparation cylinder reaches the set liquid level, turn on the stirring device to mix the mineral particles and flotation reagents to obtain a mixed slurry.

[0029] S2. The mixed slurry is discharged from the outlet, collected, and then processed further.

[0030] S3. After the slurry preparation is completed, turn off the mixing device, stop feeding the ore, open the ore drain pipe, and drain the residual slurry in the slurry cylinder.

[0031] The beneficial effects of this invention are as follows:

[0032] 1) Flotation reagents and mineral particles enter the vortex slurry conditioner. Under the collision of the fluids and the strong stirring action of the impeller, strong turbulence is generated in the vortex conditioner, further enhancing turbulent dissipation and inducing small-scale turbulent micro-vortices. This promotes the dispersion and mixing of flotation reagents and mineral particles, as well as the adsorption of flotation reagents on the surface of mineral particles, achieving fine particle slurry conditioning. Slurry conditioning within the entire conditioning cylinder, along the slurry conditioning pipeline, sequentially involves collisional flow conditioning and agitated vortex conditioning. The corresponding turbulent dissipation gradient is enhanced, while the turbulent vortex size gradient decreases, respectively strengthening the particle-reagent mixing process and the forced adsorption process during slurry conditioning.

[0033] 2) Several spiral blades are installed inside the mineralization distribution pipe to generate a spiral shear flow, which enhances the shear dispersion of the reagent and promotes the breakup and dispersion of large-diameter reagents into small-diameter reagents, creating favorable initial conditions for the subsequent mixing and reagent adsorption processes.

[0034] 3) The inlet pipe is connected to the inner lining jet pipe. The inner lining jet pipe increases the intensity of the collision flow by extending into the slurry conditioning cylinder and reducing its diameter. The collision flow can enhance turbulent dissipation, induce small-scale eddies, and strengthen the mixing and collision of fine mineral particles with reagents. On the other hand, it avoids the accumulation of slurry at the bottom of the vortex slurry conditioner, which would affect the working effect.

[0035] 4) The vortex slurry conditioner is divided into four chambers by three layers of annular plates, from low to high: the collision flow slurry conditioning chamber, the vortex forced slurry conditioning chamber, the dispersion circulation slurry conditioning chamber, and the discharge chamber. The vortex forced slurry conditioning chamber generates strong turbulence through high-speed rotation of a semi-open radial impeller, inducing small-scale turbulent micro-vortices. This further enhances the dispersion of the reagent and generates tiny droplets, while also facilitating the forced collision and adsorption of tiny droplets on the particle surface. The dispersion circulation slurry conditioning chamber generates axial downward pressure through an open axial downward pressure impeller, which promotes the downward circulation of the slurry, increases the residence time of mineral particles in the cylinder, and increases the frequency of their collision with reagent droplets.

[0036] 5) The mineralization device is a closed, confined space at the top. During operation, a high-pressure solution environment is formed inside the slurry preparation cylinder, which further enhances the concentration of energy, strengthens turbulent motion, and promotes the emulsification and dispersion of the reagent. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the slurry preparation device of the present invention;

[0038] Figure 2 This is a schematic diagram of the impeller structure.

[0039] Figure 3 This is a schematic diagram of the structure of a distributed circulation impeller;

[0040] Figure 4 A schematic diagram showing the installation of spiral blades inside the slurry distribution pipe.

[0041] The meanings of the symbols marked in the figure are as follows:

[0042] 10-Slurry mixing cylinder 11-Inlet 12-Inner lining jet pipe 13-Outlet 14-Sealing cover plate

[0043] 30-Agitator; 31-Pulley Adjuster Impeller; 32-Dispersion Circulation Impeller

[0044] 40-Slurry distribution tank; 41-Slurry distribution pipe; 411-Helical blade

[0045] 50 - Circular plate 51 - Center hole

[0046] 50a - First annular plate; 50b - Second annular plate; 50c - Central annular plate

[0047] 52-Baffle 53-Liner

[0048] 60-Drive Motor Detailed Implementation

[0049] The technical solution of the present invention will be described in more detail below with reference to the embodiments and accompanying drawings:

[0050] Example 1

[0051] like Figures 1-3 As shown, a confined space-based eddy current forced slurry conditioning device includes a slurry conditioner body. Inside the slurry conditioner body is a slurry conditioning cylinder 10 for mineral slurry conditioning. The slurry conditioning cylinder 10 is closed at both ends, with a ore inlet 11 on its bottom sidewall and an ore outlet 12 on its top sidewall, forming a slurry conditioning pipeline running from bottom to top within the slurry conditioning cylinder 10. A ore discharge pipe 13 is also provided at the bottom of the slurry conditioning cylinder 10 for discharging residual slurry inside the slurry conditioning cylinder 10 after the process is completed.

[0052] The ore inlet 11 includes at least two oppositely arranged inlet pipes, allowing minerals and flotation reagents to enter the slurry conditioning cylinder 10 in the form of collisional flow. On the one hand, the collisional flow can enhance turbulent dissipation, induce small-scale eddies, and strengthen the mixing and collision adsorption of fine-grained minerals and reagents; on the other hand, it can prevent the slurry from accumulating at the bottom of the vortex slurry conditioner, which would affect the working effect.

[0053] To enhance the impact flow, an inner-lined jet pipe 111 is also provided at the connection between the inlet pipe and the slurry preparation cylinder 10. The inner-lined jet pipe 111 extends through the side wall of the slurry preparation cylinder 10 and into the slurry preparation cylinder 10 by a set distance. The diameter of the inner-lined jet pipe 111 is 1 / 4 to 3 / 4 of the diameter of the inlet pipe.

[0054] Furthermore, the eddy current slurry conditioning device also includes a slurry distribution tank 40, on which a closed pipe is arranged around the outer wall of the slurry conditioning cylinder 10. The slurry distribution tank 40 is located near the outlet 12. The inlet end of the inlet 11 is located on the slurry distribution tank 40, and the slurry distribution tank 40 is connected to slurry distribution pipes 41. The number of slurry distribution pipes 41 matches the number of inlet pipes. After the minerals and flotation reagents enter the slurry distribution tank 40, they flow to the inlet pipes through the slurry distribution pipes 41 to enhance collision.

[0055] The device also includes a stirring device 30, which is located inside the slurry preparation cylinder 10. The stirring device 30 has a slurry preparation impeller 31 for stirring. The slurry preparation impeller 31 is a semi-open impeller, which is located above the collision flow path between the inlet pipes. The slurry preparation impeller 31 induces small-scale eddies through stirring to enhance the collision and adsorption of fine mineral particles and reagents.

[0056] The top of the slurry preparation cylinder 10 is sealed by a sealing cover plate 14. The eddy current slurry preparer is also connected to a power unit, which is electrically connected to the stirring device 30 in the eddy current slurry preparer. The power unit is a drive motor 60, which is mounted on the sealing cover plate 14 at the top of the slurry preparation cylinder 10.

[0057] In this embodiment, the stirring device 30 is a rod with a stirring shaft, which is arranged along the axis of the slurry preparation cylinder 10. The slurry preparation impeller 31 is arranged at one end of the stirring shaft, and the other end of the stirring shaft is connected to the drive motor 60. The stirring shaft rotates to drive the slurry preparation impeller 31 to work. At the position between the ore outlet 12 and the central annular plate 50c, a dispersing circulation impeller 32 is also arranged on the stirring shaft of the stirring device 30. The dispersing circulation impeller 32 is an open axial downward pressure flow impeller.

[0058] Example 2

[0059] Based on Example 1, the slurry preparation cylinder 10 also has horizontally arranged annular plates 50 inside. The edges of the annular plates 50 are tightly connected to the inner wall of the slurry preparation cylinder 10, and the central hole 51 of the annular plates 50 is used for slurry flow. A total of three annular plates 50 divide the slurry preparation cylinder 10 into interconnected compartments to enhance the different stages of the mixing and adsorption process between mineral particles and flotation reagents inside the slurry preparation cylinder 10.

[0060] Specifically, a first annular plate 50a is disposed between the inlet 11 and the slurry conditioning impeller 31, forming a collision flow slurry conditioning chamber with the bottom of the slurry conditioning cylinder 10; a second annular plate 50b is disposed near the outlet 12 below the outlet 12, forming a slurry discharge chamber with the top of the slurry conditioning cylinder 10. A central annular plate 50c is also disposed between the dispersing circulation impeller 32 and the slurry conditioning impeller 31, forming a dispersing circulation slurry conditioning chamber between the central annular plate 50c and the second annular plate 50b, and a vortex forced slurry conditioning chamber between the central annular plate 50c and the first annular plate 50a.

[0061] In the slurry conditioning chamber, the inlet 11 is equipped with an inlet pipe so that the minerals and flotation reagents enter the conditioning cylinder 10 in the form of colliding flow. On the one hand, the colliding flow enhances turbulent dissipation, induces small-scale eddies, and strengthens the mixing and collision of fine-grained minerals and flotation reagents; on the other hand, it avoids the slurry from accumulating at the bottom of the conditioning cylinder 10, which would affect the working effect.

[0062] The slurry conditioning impeller 31 is installed in the vortex forced slurry conditioning chamber. The slurry conditioning impeller 31 is a semi-open radial impeller. Its high-speed rotation can generate strong turbulence and induce small-scale turbulent micro-vortices. On the one hand, it further enhances the dispersion of the reagent and generates tiny droplets. On the other hand, it is conducive to the forced collision and adsorption of tiny droplets on the particle surface. The dispersion circulation impeller 32 is installed in the dispersion circulation slurry conditioning chamber. The dispersion circulation impeller 32 is an open axial downward pressure flow impeller. Its high-speed rotation generates axial downward pressure flow, which can promote the downward circulation of the slurry, enhance the residence time of mineral particles in the cylinder, and increase the frequency of their collision with reagent droplets.

[0063] In this embodiment, the diameter of the central hole 51 of the first annular plate 50a is less than or equal to the inlet diameter of the slurry impeller 31, and the diameters of the central holes 51 of the central annular plate 50c and the second annular plate 50b are both greater than the blade diameters of the slurry impeller 31 and the blade diameters of the dispersion circulation impeller 32.

[0064] Baffles 52 are provided on the upper surface of the first annular plate 50a and the lower surface of the second annular plate 50b. Several baffles 52 are arranged radially around the central hole 51 of the annular plate 50. One long side of the baffle 52 is attached to the inner wall of the slurry mixing cylinder 10. The width of the baffle 52 is shorter than the annular width of the annular plate 50. Liners 53 are provided on both the upper and lower surfaces of the central annular plate 50c. The liners 53 are arranged radially around the central hole 51 of the central annular plate 50c. One long side of the liners 53 is attached to the inner wall of the slurry mixing cylinder 10. The width of the liners 53 is shorter than the annular width of the central annular plate 50c.

[0065] The baffle 52 and the liner 53 can support the annular plate 50 and prevent minerals from forming an inertial vortex that adheres to the inner wall of the slurry conditioning cylinder 10, thereby improving the slurry conditioning effect. In order to further avoid the formation of inertial vortex, the baffle 52 provided on the upper surface of the first annular plate 50a extends upward to a position beyond being flush with the slurry conditioning impeller 31, and the baffle 52 provided on the lower surface of the second annular plate 50b extends downward to a position beyond being flush with the dispersing circulation impeller 32.

[0066] In this invention, for example, 4 to 8 baffles 52 and liners 53 are evenly arranged around the central hole 51 of the annular plate 50, and the number of both is the same. However, in practical applications, there are no specific requirements for the number and shape of the baffles 52 and liners 53; they can be adjusted according to the slurry preparation requirements.

[0067] Example 3

[0068] To further improve the pulping effect, such as Figure 4 As shown, in this invention, multiple sets of spiral blades 411 are arranged at intervals on the inner wall of the slurry distribution pipe 41. The width of the spiral blades 411 is 1 / 4 to 1 / 2 of the diameter of the slurry distribution pipe 41, and the height of a single spiral blade 411 is 1 / 2 of the width of the spiral blade 411. When the slurry passes through the slurry distribution pipe 41, the strong turbulent shearing and mechanical cutting generated by the spiral blades 411 can enhance the shear dispersion of the reagent, causing large-diameter reagent particles to break down and disperse into small-diameter reagent particles, creating initial favorable conditions for the subsequent mixing and reagent adsorption processes. In addition, it also helps to improve the mixing effect between minerals and reagents.

[0069] Example 4

[0070] This invention provides a slurry conditioning method for the aforementioned confined space-based eddy current slurry conditioning device, comprising the following steps:

[0071] S1. When the slurry preparation begins, the discharge pipe 13 is closed. The mineral particles and flotation reagents enter the slurry preparation cylinder 10 from the inlet 11 through the inlet pipe in the form of a collision flow. After the slurry in the slurry preparation cylinder 10 reaches the set liquid level, the stirring device 30 is turned on to mix the mineral particles and flotation reagents to obtain a mixed slurry.

[0072] S2. The mixed slurry is discharged from outlet 12, collected, and then processed.

[0073] S3. After the slurry preparation is completed, turn off the mixing device 30, stop feeding the ore, open the ore drain pipe 13, and drain the residual ore slurry in the slurry cylinder 10.

[0074] When the slurry distribution tank 40 is installed at the inlet of the slurry preparation pipeline, the operation process remains unchanged. Only the circulation process of minerals and flotation reagents is increased by the distribution process in the slurry distribution tank 40, which will not be described in detail here.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A confined space-based eddy current forced slurry conditioning device, comprising a slurry conditioner body, wherein the slurry conditioner body has a slurry conditioning cylinder (10) inside, characterized in that, The bottom side wall of the slurry preparation cylinder (10) is provided with an inlet (11) and the top side wall is provided with an outlet (12), forming a slurry preparation pipeline from bottom to top inside the slurry preparation cylinder (10); the inlet (11) includes at least two oppositely arranged inlet pipes, so that the mineral slurry enters the slurry preparation cylinder (10) in the form of collision flow; the inlet end of the inlet (11) is connected to the slurry distribution tank (40), the slurry distribution tank (40) is a closed pipe arranged around the outer side wall of the slurry preparation cylinder (10), and the slurry distribution tank (40) is arranged close to the outlet (12); the slurry distribution tank (40) is connected to the slurry distribution pipe (41), the number of slurry distribution pipes (41) matches the number of inlet pipes, after the slurry enters the slurry distribution tank (40), it flows to the inlet pipe through the slurry distribution pipe (41) to enhance the collision; A small-diameter inner-lined jet pipe (111) is provided at the connection between the inlet pipe and the slurry preparation cylinder (10). The inner-lined jet pipe (111) extends a set distance through the side wall of the slurry preparation cylinder (10) into the slurry preparation cylinder (10) to enhance the collision. The inner wall of the slurry distribution pipe (41) is also provided with spiral blades (411) at intervals. The width of the spiral blades (411) is 1 / 4 to 1 / 2 of the diameter of the slurry distribution pipe (41), and the height of a single spiral blade (411) is 1 / 2 of the width of the spiral blade (411).

2. The eddy current forced slurry adjustment device based on confined space as described in claim 1, characterized in that, The device also includes a stirring device (30), which is disposed inside the slurry preparation cylinder (10). The stirring device (30) has a slurry preparation impeller (31) for stirring, which is disposed above the collision flow path between the inlet pipes.

3. The eddy current forced slurry adjustment device based on a confined space as described in claim 1, characterized in that, The small-diameter inner-lined jet pipe (111) is specifically: the diameter of the inner-lined jet pipe (111) is 1 / 4 to 3 / 4 of the diameter of the inlet pipe.

4. The eddy current forced slurry adjustment device based on confined space as described in claim 1, characterized in that, The slurry conditioning cylinder (10) has horizontally arranged annular plates (50) inside. The edges of the annular plates (50) are tightly connected to the inner wall of the slurry conditioning cylinder (10). The central hole (51) of the annular plates (50) is used for slurry flow. Several annular plates (50) divide the slurry conditioning cylinder (10) into interconnected compartments to accommodate different stages of the mixing and adsorption slurry conditioning process between mineral particles and flotation reagents inside the slurry conditioning cylinder (10).

5. The eddy current forced slurry adjustment device based on a confined space as described in claim 4, characterized in that, The first annular plate (50a) is located between the inlet (11) and the slurry impeller (31), and the first annular plate (50a) and the bottom of the slurry cylinder (10) form a collision flow slurry chamber; the second annular plate (50b) is located near the outlet (12) and below the outlet (12), and the second annular plate (50b) and the top of the slurry cylinder (10) form a slurry discharge chamber.

6. The eddy current forced slurry adjustment device based on a confined space as described in claim 5, characterized in that, A central annular plate (50c) is also provided between the second annular plate (50b) and the slurry impeller (31). A dispersed circulation slurry conditioning chamber is formed between the central annular plate (50c) and the second annular plate (50b), and a vortex forced slurry conditioning chamber is formed between the central annular plate (50c) and the first annular plate (50a).

7. The eddy current forced slurry adjustment device based on a confined space as described in claim 2, characterized in that, The impeller (31) is a semi-open radial impeller.

8. The eddy current forced slurry adjustment device based on a confined space as described in claim 6, characterized in that, The stirring device (30) also includes a dispersion circulation impeller (32), which is located in the dispersion circulation slurry chamber.

9. The eddy current forced slurry adjustment device based on a confined space as described in claim 8, characterized in that, The dispersed circulation impeller (32) is an open axial downward pressure flow impeller.

10. The eddy current forced slurry adjustment device based on a confined space as described in claim 6, characterized in that, The diameter of the central hole (51) of the first annular plate (50a) is less than or equal to the diameter of the inlet of the slurry impeller (31), and the diameter of the central hole (51) of the central annular plate (50c) and the second annular plate (50b) is greater than the blade diameter of the slurry impeller (31) and the blade diameter of the dispersion circulation impeller (32).

11. The eddy current forced slurry adjustment device based on a confined space as described in claim 8, characterized in that, Baffles (52) are provided on the upper surface of the first annular plate (50a) and the lower surface of the second annular plate (50b). Several baffles (52) are arranged radially around the central hole (51) of the annular plate (50). The long side of one side of the baffle (52) is attached to the inner wall of the slurry mixing cylinder (10). The width of the baffle (52) is shorter than the annular width of the annular plate (50).

12. The eddy current forced slurry adjustment device based on confined space as described in claim 11, characterized in that, The baffle (52) provided on the upper surface of the first annular plate (50a) extends upward beyond the top surface of the slurry adjusting impeller (31), and the baffle (52) provided on the lower surface of the second annular plate (50b) extends downward beyond the bottom surface of the dispersing circulation impeller (32).

13. The eddy current forced slurry adjustment device based on a confined space as described in claim 10, characterized in that, The upper and lower surfaces of the central annular plate (50c) are provided with lining plates (53). The lining plates (53) are arranged radially around the central hole (51) of the central annular plate (50c). One long side of the lining plate (53) is attached to the inner wall of the slurry cylinder (10). The width of the lining plate (53) is shorter than the ring width of the central annular plate (50c).

14. The eddy current forced slurry adjustment device based on a confined space as described in claim 11, characterized in that, The baffles (52) are evenly arranged in 4 to 8 pieces around the central hole (51) of the annular plate (50).

15. The eddy current forced slurry adjustment device based on a confined space as described in claim 13, characterized in that, The liner (53) is evenly arranged in 4 to 8 pieces around the central hole (51) of the annular plate (50).

16. The eddy current forced slurry adjustment device based on a confined space as described in claim 2, characterized in that, The top of the slurry preparation cylinder (10) is sealed by a sealing cover plate (14), and the bottom of the slurry preparation cylinder (10) is also provided with a ore discharge pipe (13) for discharging residual slurry.

17. The eddy current forced slurry adjustment device based on a confined space as described in claim 16, characterized in that, The mixing cylinder (10) is also connected to a power unit, which is electrically connected to the stirring device (30) in the mixing cylinder (10).

18. The eddy current forced slurry adjustment device based on a confined space as described in claim 17, characterized in that, The power unit is a drive motor (60), which is mounted on the sealing cover plate (14) at the top of the slurry cylinder (10).

19. A method for preparing slurry using a confined space-based eddy current forced slurry preparation device as described in any one of claims 1-18, characterized in that, Includes the following steps: S1. When the slurry preparation begins, close the discharge pipe (13). The mineral particles and flotation reagents enter the slurry preparation cylinder (10) through the inlet pipe in the form of a collision flow from the ore inlet (11). After the slurry in the slurry preparation cylinder (10) reaches the set liquid level, turn on the stirring device (30) to mix the mineral particles and flotation reagents to obtain a mixed slurry. S2. The mixed slurry is discharged from the outlet (12), collected, and then processed. S3. After the slurry preparation is completed, turn off the mixing device (30), stop feeding the ore, open the ore drain pipe (13), and drain the residual slurry in the slurry cylinder (10).

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