Stirring device for flotation machine and flotation machine

Abstract

The utility model relates to the technical field of mineral separation equipment, in particular to a stirring device for a flotation machine and the flotation machine. The stirring device comprises a rotor, an upper stator and a lower stator; the rotor comprises a stirring shaft, a guide plate, a support frame, a first stirring rod and a second stirring rod; the upper stator comprises an air inlet pipe, an upper supporting plate and a third stirring rod; the lower stator comprises a lower supporting plate and a fourth stirring rod; a working area is formed between the upper supporting plate and the lower supporting plate and comprises a negative pressure area in the middle and a high-energy mineralization area surrounding the negative pressure area, the first stirring rods and the third stirring rods are arranged in a staggered mode, and the second stirring rods and the fourth stirring rods are arranged in a staggered mode. And a high-energy density turbulent flow area is generated in the high-energy mineralization area, so that bubbles and mineral particles obtain relatively large collision energy, and the mineralization efficiency of the bubbles is greatly improved. A high-energy mineralization area is limited in a limited area, energy consumption is saved, and meanwhile interference on a separation area on the upper portion of the flotation tank is small. And an existing flotation machine is particularly convenient to reform.

Description

Technical Field

[0001] The present application relates to the technical field of mineral separation equipment, and in particular to a stirring device for a flotation machine and a flotation machine. Background Art

[0002] Coal slime flotation machine is one of the main equipment for sorting fine coal slime. Its main functions in the flotation process are as follows: First, the slurry is in a turbulent state to ensure the suspension of mineral particles and the dispersion of reagents, and the mineral particles are moved and collided with a certain kinetic energy to achieve the adhesion of mineral particles and reagents; second, air is introduced to produce bubbles of appropriate size, sufficient quantity, and appropriate stability, so that they are dispersed in the slurry, move with a certain kinetic energy, and collide with reagents and mineral particles to produce selective adhesion and achieve mineralization of bubbles; third, the mineralized bubbles can rise to the liquid surface to form a three-phase foam layer and produce a secondary enrichment effect; the foamed clean coal and tailings can be discharged in time.

[0003] In the process of mineral flotation, the energy configuration requirements of different flotation stages are different. One of the key stages is the dispersion of reagents, the collision, adsorption and foam mineralization of ore particles and reagents. However, the surface of coal particles and the surface of oil droplets of non-polar oil flotation reagents are negatively charged, and the hydration film formed by the hydrophilic points on the surface of ore particles and the hydration film formed by the addition of frothers also exist on the surface of foams. These factors form energy barriers, which hinder the adhesion of coal particles, flotation reagent droplets and bubbles during the collision process. Therefore, only by increasing the turbulence intensity of the slurry flow and giving enough kinetic energy to the ore particles, flotation reagent droplets and bubbles can the energy barrier be overcome to achieve effective adhesion between ore particles and reagents, and between ore particles and bubbles.

[0004] However, in the current non-mechanical stirring flotation machine and mechanical stirring flotation machine, the turbulence intensity of the three-phase ore pulp flow in the turbulent zone in the flotation tank is not high enough, especially for the mechanical stirring flotation machine, the stator-rotor system is the key component that converts mechanical energy into fluid kinetic energy. The existing rotor stirs the ore pulp by multiple radially arranged metal plates on the rotor. The centrifugal effect generated by the high-speed rotation of the rotor ensures a large circulation volume of the three-phase ore pulp in the flotation tank, inhaling air and avoiding the precipitation of solid particles. Because of this, stirring dozens of tons of ore pulp consumes a lot of energy, and the local energy provided to the collision between particles and bubbles is low. This unreasonable allocation of energy, especially for coal particles with very fine particle size and low density, has a lower energy for collision with bubbles, which seriously affects the mineralization process of bubbles, affects the flotation effect, and increases energy consumption. Utility Model Content

[0005] In order to solve the above technical problems, this application provides the following technical solutions based on the existing technology.

[0006] In a first aspect, an embodiment of the present application provides a stirring device for a flotation machine, comprising a rotor, an upper stator and a lower stator, wherein:

[0007] The rotor comprises a stirring shaft, a guide plate, a support frame, a first stirring rod and a second stirring rod, wherein the guide plates are provided in plurality and are fixed around the stirring shaft, the support frame is connected to the stirring shaft, the first stirring rod and the second stirring rod are provided in plurality and are parallel to the stirring shaft, and the first stirring rod and the second stirring rod are respectively connected to opposite sides of the support frame;

[0008] The upper stator comprises an air inlet pipe, an upper support plate perpendicular to the stirring shaft, and a plurality of third stirring rods vertically arranged on the same side of the upper support plate, the upper support plate is sleeved outside the stirring shaft, and a through slurry circulation hole is formed on the upper support plate;

[0009] The lower stator comprises a lower support plate perpendicular to the stirring shaft and a plurality of fourth stirring rods vertically arranged on the same side of the lower support plate, the lower support plate is sleeved outside the stirring shaft, and a through slurry feeding hole is formed on the lower support plate;

[0010] A working area is formed between the upper support plate and the lower support plate, and the working area includes a negative pressure area in the middle and a high-energy mineralization area surrounding the negative pressure area. The guide plate is located in the negative pressure area. The first stirring rod, the second stirring rod, the third stirring rod and the fourth stirring rod are located in the high-energy mineralization area. The first stirring rod and the third stirring rod are staggered, and the second stirring rod and the fourth stirring rod are staggered. The air inlet pipe, the slurry circulation hole and the slurry feed hole are all connected to the negative pressure area.

[0011] Furthermore, the guide plate is arc-shaped, and a plurality of the guide plates are evenly distributed along the circumference of the stirring shaft.

[0012] Furthermore, the surface of the guide plate is a cylinder, and the generatrix of the cylinder is parallel to the axis of the stirring shaft.

[0013] Furthermore, the support frame is a support rod perpendicular to the stirring shaft, and a plurality of support rods are provided and radially fixed around the stirring shaft.

[0014] Furthermore, a plurality of the first stirring rods and the second stirring rods are arranged at intervals along the extending direction of the support rod.

[0015] Further, the first stirring rod, the second stirring rod, the third stirring rod and the fourth stirring rod are arranged in a circular array with the axis of the stirring shaft as the center.

[0016] Furthermore, the air inlet pipe is a hollow shaft sleeved on the outside of the stirring shaft, and an air inlet channel is formed between the inner wall of the hollow shaft and the stirring shaft.

[0017] In a second aspect, an embodiment of the present application provides a flotation machine, which includes a flotation cell and the stirring device provided in the first aspect of the present application, wherein the guide plate, the support frame, the first stirring rod, the second stirring rod, the upper support plate, the third stirring rod and the lower stator are all located inside the flotation cell.

[0018] Furthermore, one end of the lower support plate is connected to the side wall of the flotation tank, and the flotation tank is provided with a feed inlet, which communicates with the area between the lower support plate and the bottom wall of the flotation tank.

[0019] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0020] Through the high-speed relative movement of the first stirring rod on the support frame relative to the third stirring rod on the upper stator, and the high-speed relative movement of the second stirring rod on the support frame relative to the fourth stirring rod on the lower stator, a high-energy density turbulent zone is generated in the high-energy mineralization zone, so that the bubbles and mineral particles obtain greater collision energy, overcome the hydration film and electrostatic repulsion resistance that hinder the mineralization of the bubbles, and greatly improve the mineralization efficiency of the bubbles.

[0021] The energy configuration of the flotation machine is made more reasonable, and the high-energy mineralized area forming high-density turbulence is confined to the limited area between the upper support plate and the lower support plate, which saves energy consumption. At the same time, it has less interference with the separation area on the upper part of the flotation tank, which helps to improve the separation efficiency of flotation.

[0022] The stirring device of the present application is only a modification of the stirring mechanism of the existing flotation machine, and the other parts can completely utilize the existing flotation machine, which is particularly convenient for modifying the existing flotation machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 A longitudinal cross-sectional view of a stirring device provided in an embodiment of the present application, Figure 1The first stirring rod 140, the second stirring rod 150, the third stirring rod 230 and the fourth stirring rod 320 through which the section plane passes are shown, and the first stirring rod 140, the second stirring rod 150, the third stirring rod 230 and the fourth stirring rod 320 through which the section plane does not pass are not shown. Figure 1 In the display;

[0026] Figure 2 A top view of a stirring device provided in an embodiment of the present application, Figure 2 The third stirring rod 230 is not visible, and the installation position of the third stirring rod 230 is shown by a dotted line in the figure.

[0027] Figure 3 A longitudinal cross-sectional view of a rotor in a stirring device provided in an embodiment of the present application, Figure 3 The first stirring rod 140 and the second stirring rod 150 through which the section plane passes are shown in FIG. 1 , and the first stirring rod 140 and the second stirring rod 150 through which the section plane does not pass are not shown in FIG. Figure 3 In the display;

[0028] Figure 4 A top view of a rotor in a stirring device provided in an embodiment of the present application;

[0029] Figure 5 This is a longitudinal cross-sectional view of the upper stator in the stirring device provided in an embodiment of the present application, Figure 5 The third stirring rod 230 through which the cutting plane passes is shown in FIG. 1 , and the third stirring rod 230 through which the cutting plane does not pass is not shown in FIG. Figure 5 In the display;

[0030] Figure 6 A bottom view of an upper stator in a stirring device provided in an embodiment of the present application;

[0031] Figure 7 A longitudinal cross-sectional view of a lower stator in a stirring device provided in an embodiment of the present application, Figure 7 The fourth stirring rod 320 through which the cutting plane passes is shown in FIG. 1 , and the fourth stirring rod 320 through which the cutting plane does not pass is not shown in FIG. Figure 7 In the display;

[0032] Figure 8 A top view of a lower stator in a stirring device provided in an embodiment of the present application;

[0033] Fig. 9 A schematic cross-sectional view of a portion of the structure of a flotation machine provided in an embodiment of the present application;

[0034] In the figure:

[0035] 100, rotor; 110, stirring shaft; 120, guide plate; 130, support frame; 140, first stirring rod; 150, second stirring rod;

[0036] 200, upper stator; 210, air inlet pipe; 220, upper support plate; 230, third stirring rod; 240, slurry circulation hole;

[0037] 300, lower stator; 310, lower support plate; 320, fourth stirring rod; 330, slurry feeding hole.

[0038] 400, working area; 410, negative pressure area; 420, high energy mineralization area;

[0039] 500. Flotation tank; 510. Feed inlet. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] In the present application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", "outer", "front", "back", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0043] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0044] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0046] The following will refer to the attached Figure 1-9 The present application is described in detail with reference to embodiments.

[0047] The stirring device provided in the embodiment of the present application is used to be installed in a flotation machine. The basic function of the stirring device in the flotation machine is to make the slurry in the flotation machine in a turbulent state to ensure the suspension of mineral particles and the dispersion of reagents, and to introduce air to generate fine bubbles, and provide a certain kinetic energy to the mineral particles, reagents and bubbles for movement and collision, thereby generating selective adhesion and realizing the mineralization of the bubbles.

[0048] like Figure 1-9 As shown, the structure of the stirring device provided in the embodiment of the present application mainly includes a rotor 100, an upper stator 200 and a lower stator 300. As the name implies, during use, the upper stator 200 and the lower stator 300 are fixed relative to the flotation machine, and the rotor 100 is a structural component that rotates relative to the upper stator 200 and the lower stator 300.

[0049] like Figure 3 and 4 As shown, the rotor 100 includes a stirring shaft 110, a guide plate 120, a support frame 130, a first stirring rod 140 and a second stirring rod 150, a plurality of guide plates 120 are provided and are fixed around the stirring shaft 110, the support frame 130 is connected to the stirring shaft 110, a plurality of first stirring rods 140 and a second stirring rod 150 are provided and are parallel to the stirring shaft 110, and the first stirring rod 140 and the second stirring rod 150 are respectively connected to opposite sides of the support frame 130. Figure 5 and 6 As described above, the upper stator 200 includes an air inlet pipe 210, an upper support plate 220 perpendicular to the stirring shaft 110, and a plurality of third stirring rods 230 vertically arranged on the same side of the upper support plate 220. The upper support plate 220 is sleeved on the outside of the stirring shaft 110, and a through slurry circulation hole 240 is formed on the upper support plate 220; Figure 7 and 8As shown, the lower stator 300 includes a lower support plate 310 perpendicular to the stirring shaft 110 and a plurality of fourth stirring rods 320 vertically arranged on the same side of the lower support plate 310. The lower support plate 310 is sleeved on the outside of the stirring shaft 110, and a through slurry feed hole 330 is formed on the lower support plate 310.

[0050] In the above stirring device, as Figure 1 and 2 As shown, a working area 400 is formed between the upper support plate 220 of the upper stator 200 and the lower support plate 310 of the lower stator 300. The working area 400 includes a negative pressure area 410 in the middle and a high-energy mineralization area 420 surrounding the negative pressure area 410. The guide plate 120 is located in the negative pressure area 410. The first stirring rod 140, the second stirring rod 150, the third stirring rod 230 and the fourth stirring rod 320 are located in the high-energy mineralization area 420. The first stirring rod 140 and the third stirring rod 230 are alternately arranged, and the second stirring rod 150 and the fourth stirring rod 320 are alternately arranged. The air inlet pipe 210, the slurry circulation hole 240 and the slurry feed hole 330 are all connected to the negative pressure area 410. It should be noted that the purpose of staggered arrangement of the first stirring rod 140 and the third stirring rod 230, and the purpose of staggered arrangement of the second stirring rod 150 and the fourth stirring rod 320 is to enable relative movement between the moving stirring rod and the stationary stirring rod, thereby shearing the three-phase slurry and improving the fluid turbulence state of the high-energy mineralization zone 420. The staggered arrangement needs to ensure the normal rotation of the rotor 100, that is, the spatial layout of the third stirring rod 230 will not interfere with the rotating first stirring rod 140, and the spatial layout of the fourth stirring rod 320 will not interfere with the rotating second stirring rod 150. In addition, the support frame 130 is located in the gap between the upper stator 200 and the lower stator 300, and the rotation of the support frame 130 should not be interfered with by the third stirring rod 230 and the fourth stirring rod 320.

[0051] During use of the stirring device in the above embodiment, the upper stator 200 and the lower stator 300 are fixedly arranged relative to the flotation machine, and the stirring shaft 110 is driven to rotate by the power mechanism, and the stirring shaft 110 will drive the guide plate 120, the support frame 130, the first stirring rod 140 and the second stirring rod 150 to rotate together. The centrifugal force generated by the rotating guide plate 120 will throw the slurry radially to the surroundings, thereby generating negative pressure in the negative pressure zone 410, so that air can be sucked from the environment into the negative pressure zone 410 through the air inlet pipe 210, and at the same time, the slurry can be sucked into the lower support plate 310 of the lower stator 300 through the slurry feed hole 330 Under the action of the centrifugal force generated by the rotating guide plate 120, the air and slurry sucked into the negative pressure zone 410 will be thrown to the surrounding high-energy mineralization zone 420, and the first stirring rod 140 and the third stirring rod 230 staggered in the high-energy mineralization zone 420 will produce relative movement, and the second stirring rod 150 and the fourth stirring rod 320 staggered in the high-energy mineralization zone 420 will produce relative movement, so that the high-energy mineralization zone 420 becomes a high-energy density stirring area, and the bubbles formed by the air are further crushed into fine bubbles. The mineral particles in the slurry also obtain enough kinetic energy in this area to collide with the bubbles and realize mineralization, and are finally discharged from the periphery of the area to the outside of the stirring device. In the above process, the slurry entering the high-energy mineralization zone 420 through the centrifugal action of the guide plate 120 is continuously collided and cut, generating countless internal turbulent small cycles. The specific collision and cutting will exist in the following relative motion areas: between the side of the first stirring rod 140 and the side of the third stirring rod 230, between the side of the second stirring rod 150 and the side of the fourth stirring rod 320, between the free end of the first stirring rod 140 and the lower surface of the upper support plate 220, between the free end of the second stirring rod 150 and the upper surface of the lower support plate 310, between the free end of the third stirring rod 230 and the upper surface of the support frame 130, and between the free end of the fourth stirring rod 320 and the lower surface of the support frame 130. The above-mentioned several relative motion areas can realize effective collision and cutting of the slurry, and the countless turbulent small circulations formed will shuttle and wander in the gaps between the first stirring rod 140, the second stirring rod 150, the third stirring rod 230 and the fourth stirring rod 320, but will generally move to the periphery under the centrifugal action of the negative pressure zone 410, and finally gather at the edge and leave the stirring device. In this process, the mineral particles, bubbles and reagents fully collide to complete the bubble mineralization. The discharged mineralized bubbles rise to the liquid surface of the flotation machine under the buoyancy in the slurry, and the mineral particles outside the stirring device that are not adhered by the bubbles will be further returned to the negative pressure zone 410 from the slurry circulation hole 240 opened on the upper support plate 220 of the upper stator 200 under the negative pressure generated by the guide plate 120, and then be thrown back to the high-energy mineralization zone 420, and collide with the bubbles again under the relative motion of the rotor 100, the upper stator 200 and the lower stator 300 to achieve bubble mineralization, and repeat the cycle to achieve mineral sorting.

[0052] During operation, the stirring device of the above embodiment generates high-energy-density turbulence in the high-energy mineralization zone 420 through the high-speed relative movement of the first stirring rod 140 on the support frame 130 relative to the third stirring rod 230 of the upper stator 200, and through the high-speed relative movement of the second stirring rod 150 on the support frame 130 relative to the fourth stirring rod 320 of the lower stator 300, so that the bubbles and mineral particles obtain greater collision energy, overcome the hydration film and electrostatic repulsion resistance that hinder the mineralization of the bubbles, and greatly improve the mineralization efficiency of the bubbles.

[0053] like Fig. 9 As shown, when the stirring device of the above embodiment is applied to the flotation machine, the energy configuration of the flotation machine can be made more reasonable, and the turbulence with high energy density is confined to a limited area at the bottom of the flotation machine, that is, the high-energy mineralization zone 420 forming the high-density turbulence is confined to the area between the upper support plate 220 and the lower support plate 310. The stirring device does not need to consume energy on the circulation and disturbance of the pulp in the entire tank of the flotation machine, but only needs to use the unique structure and relative movement of the rotor 100, the upper stator 200 and the lower stator 300 in the high-energy mineralization zone 420 to generate the required turbulence, thereby saving energy consumption. At the same time, since the disturbance area of ​​the stirring device is confined to the working area 400 between the upper support plate 220 and the lower support plate 310, it has less interference with the separation area at the top of the flotation tank 500, and is not easy to cause the desorption of the concentrate adhered to the mineralized foam, which helps to improve the separation efficiency of flotation.

[0054] In addition, it should be noted that, since conventional flotation machines have been widely used in the field of mineral flotation, the stirring device provided in the embodiment of the present application can be slightly modified on the existing flotation machine. Specifically, the stirring device of the present application is only a modification of the stirring mechanism of the existing flotation machine, and the other parts can fully utilize the existing flotation machine structure, that is, the stirring device in the present application can replace the stirring mechanism in the existing flotation machine, so the construction changes in the modification project are relatively small, which is particularly convenient for the modification of the existing flotation machine.

[0055] In some embodiments, Figure 4As shown, a plurality of guide plates 120 are evenly distributed along the circumference of the stirring shaft 110 to achieve uniform disturbance of the medium in the negative pressure zone 410. The shape of the guide plate 120 includes but is not limited to a flat plate, an arc or a special-shaped structure, preferably an arc structure. During the rotation of the rotor 100, the arc structure can be used to drive a large amount of slurry to rotate in the circumferential direction to generate sufficient centrifugal force to throw the slurry out. More preferably, the surface of the guide plate 120 is a cylindrical structure such as a cylinder, an elliptical cylinder or a parabolic cylinder, and the generatrix of the cylinder is parallel to the axis of the stirring shaft 110. Such a setting can make the guide plate 120 of the cylindrical structure not have a driving effect on the slurry in the axial direction of the stirring shaft 110, that is, the vertical direction, so that the rotating guide plate 120 only throws the slurry in the negative pressure zone 410 radially to the surrounding high-energy mineralization zone 420, reducing the ineffective movement of the slurry in the negative pressure zone 410.

[0056] In some embodiments, Figure 4 As shown, the support frame 130 is a support rod perpendicular to the stirring shaft 110, and a plurality of support rods are provided and radially fixed on the stirring shaft 110. During the rotation of the rotor 100, the side of the support rod can play a role in shearing the slurry. During the rotation of the support rod, the upper surface of the support rod and the free end of the third support rod, and the lower surface of the support rod and the free end of the fourth support rod can both achieve shearing of the slurry, thereby enhancing the disturbance effect of the stirring device on the slurry and achieving power output of the slurry in multiple directions in a unit space. In addition, the support rods radially fixed on the stirring shaft 110 prevent the slurry above and below the support rods from being isolated, so that the slurry in the high-energy mineralization zone 420 has sufficient movement space, increasing the collision probability of the mineral particles, bubbles and reagents in the slurry.

[0057] In some embodiments, a plurality of first stirring rods 140 and second stirring rods 150 are arranged at intervals along the extension direction of the support rod. The gap between two adjacent first stirring rods 140 on the same support rod is used to pass through the third stirring rod 230 during the rotation of the rotor 100, and the gap between two adjacent second stirring rods on the same support rod is used to pass through the fourth stirring rod 320 during the rotation of the rotor 100. The first stirring rod 140 and the second stirring rod 150 can be arranged coaxially in a one-to-one correspondence on the support rod, and of course, they can also be arranged in a staggered manner, or partially coaxially and partially staggered. Those skilled in the art can make specific designs according to the use requirements. For example, as shown in the drawings of the embodiment of the present application, the first stirring rod 140 and the second stirring rod 150 are all arranged coaxially in a one-to-one correspondence on the support rod.

[0058] Preferably, if Figure 1-9As shown, the first stirring rod 140, the second stirring rod 150, the third stirring rod 230 and the fourth stirring rod 320 are arranged in a circular array with the axis of the stirring shaft 110 as the center. This arrangement makes the distribution of the first stirring rod 140 and the second stirring rod 150 on the rotor 100, the distribution of the third stirring rod 230 on the upper stator 200 and the distribution of the fourth stirring rod 320 on the lower stator 300 more uniform, so that the slurry flow state in different areas of the high-energy mineralization area 420 is relatively balanced. By adjusting the rotation speed, the overall mineralization degree in the high-energy mineralization area 420 can be achieved, avoiding uneven distribution of stirring rods leading to uneven mineralization degrees in different areas of the working area 400, which is convenient for control and adjustment during the operation of the flotation machine. In addition, the above-mentioned regular structural arrangement is also convenient for the processing and assembly of various mechanical components.

[0059] In some embodiments, Figure 1 and Figure 5 As shown, the air inlet pipe 210 is a hollow shaft sleeved on the outside of the stirring shaft 110, and an air inlet channel is formed between the inner wall of the hollow shaft and the stirring shaft 110. In this embodiment, the air inlet pipe 210 can not only be used as a pipeline for introducing air into the stirring device, but can also be sleeved on the outside of the stirring shaft 110 to separate the slurry, so that the upper half of the stirring shaft 110 does not have to contact the slurry during the rotation process, which not only reduces the resistance consumption, but also avoids the disturbance caused by its direct contact with the slurry in the separation zone to cause adverse effects on the mineralized bubbles. In addition, the air inlet pipe 210 in the form of a hollow shaft can also form a shield for the stirring shaft 110, avoiding the staff from accidentally contacting the high-speed rotating stirring shaft 110, which is beneficial to safe production. Of course, the air inlet pipe 210 in the present application can also adopt other design forms besides the above-mentioned hollow shaft, and its primary purpose of setting is to achieve the introduction of air. Those skilled in the art can make corresponding adjustments to its setting position and specific structure as needed.

[0060] In some embodiments, Figure 1 As shown, a gap is formed between the guide plate 120 and the upper support plate 220, and between the guide plate 120 and the lower support plate 310. On the one hand, the gap can ensure that during the rotation of the rotor 100, the upper edge of the guide plate 120 will not cause friction interference with the upper support plate 220, and the lower edge of the guide plate 120 will not cause friction interference with the lower support plate 310; on the other hand, the gap between the upper edge of the guide plate 120 and the upper support plate 220 allows the slurry to smoothly enter the negative pressure zone 410 through the slurry circulation hole 240, and the gap between the lower edge of the guide plate 120 and the lower support plate 310 allows the slurry to smoothly enter the negative pressure zone 410 through the slurry feeding hole 330, so as to avoid the high-speed rotating guide plate 120 from forming a dynamic seal on the slurry circulation hole 240 and the slurry feeding hole 330.

[0061] The present application also provides a flotation machine, such as Fig. 9 As shown, the main structure of the flotation machine includes at least a flotation cell 500 and a stirring device, and the stirring device is the stirring device in the aforementioned embodiment of the present application. That is, the structure of the stirring device mainly includes a rotor 100, an upper stator 200 and a lower stator 300; the rotor 100 includes a stirring shaft 110, a guide plate 120, a support frame 130, a first stirring rod 140 and a second stirring rod 150, the guide plate 120 is provided with a plurality of and is fixed around the stirring shaft 110, the support frame 130 is connected to the stirring shaft 110, the first stirring rod 140 and the second stirring rod 150 are provided with a plurality of and are parallel to the stirring shaft 110, and the first stirring rod 140 and the second stirring rod 150 are respectively connected to the opposite sides of the support frame 130; the upper stator 200 includes an air inlet pipe 210, an upper support plate 220 perpendicular to the stirring shaft 110 and a plurality of third stirring rods 230 vertically arranged on the same side of the upper support plate 220, the upper support plate 220 is sleeved on the outside of the stirring shaft 110, and the upper support plate 220 begins to have a through slurry circulation hole 240; the lower stator 300 includes a plurality of The lower support plate 310 of the stirring shaft 110 and a plurality of fourth stirring rods 320 vertically arranged on the same side of the lower support plate 310, the lower support plate 310 is sleeved outside the stirring shaft 110, and a through slurry feed hole 330 is formed on the lower support plate 310; a working area 400 is formed between the upper support plate 220 of the upper stator 200 and the lower support plate 310 of the lower stator 300, and the working area 400 includes a negative pressure area 410 in the middle and a negative pressure area surrounding the negative pressure area 410. A high-energy mineralization zone 420, the guide plate 120 is located in the negative pressure zone 410, the first stirring rod 140, the second stirring rod 150, the third stirring rod 230 and the fourth stirring rod 320 are located in the high-energy mineralization zone 420, the first stirring rod 140 and the third stirring rod 230 are alternately arranged, the second stirring rod 150 and the fourth stirring rod 320 are alternately arranged, and the air inlet pipe 210, the slurry circulation hole 240 and the slurry feed hole 330 are all connected to the negative pressure zone 410.

[0062] The guide plate 120, support frame 130, first stirring rod 140, second stirring rod 150, upper support plate 220, third stirring rod 230 and lower stator 300 of the stirring device are all completely located inside the flotation tank 500 and in the lower middle position. The stirring shaft 110 is vertically arranged and connected to the power mechanism on the flotation machine. One end of the air inlet pipe 210 extends out of the flotation tank 500 to introduce air in the environment into the negative pressure zone 410 of the stirring device.

[0063] The energy configuration of the flotation machine provided in this embodiment is more reasonable, and the high-energy turbulence formed by the operation of the stirring device is limited to a limited area at the bottom of the flotation cell 500, which saves energy consumption and has little interference with the separation area at the top of the flotation cell 500, thereby improving the flotation separation efficiency. In addition, since only the stirring mechanism of the existing flotation machine is modified, the other parts can fully utilize the existing flotation machine, so it is particularly convenient to modify the existing flotation machine.

[0064] In some embodiments, one end of the lower support plate 310 of the lower stator 300 is connected to the side wall of the flotation tank 500, and the flotation tank 500 is provided with a feed port 510, which communicates with the area between the lower support plate 310 and the bottom wall of the flotation tank 500. At this time, the lower support plate 310 of the lower stator 300 plays the role of a false bottom, and a feed area of ​​the stirring device is formed between the lower support plate 310 and the bottom wall of the flotation tank 500. The slurry feed supplied from the feed port 510 first enters between the lower support plate 310 and the bottom wall of the flotation tank 500, and is sucked into the negative pressure area 410 through the slurry feed hole 330 on the lower support plate 310 when the guide plate 120 rotates at a high speed. Specifically, the upper support plate 220 is circular in shape. The circular structure design is conducive to the uniform escape of the slurry in the high-energy mineralization zone 420 from all sides of the upper support plate 220, forming a uniform floating of mineralized bubbles, and also helps to reduce the path of the circulating slurry flowing from all sides to the slurry circulation holes 240 and returning to the working area 400; in order to further improve the balanced flow of circulating slurry in all directions, the slurry circulation holes 240 are preferably evenly distributed around the center of the upper support plate 220. For example, as shown in the figure, four slurry circulation holes 240 are evenly distributed around the center of the upper support plate 220. The shape of the lower support plate 310 is preferably as shown in the figure, which includes a circular area opposite to the upper support plate 220, and the circular area extends horizontally toward the direction of the feed port 510 of the flotation tank 500 until it is connected to the tank wall of the flotation tank 500 provided with the feed port 510 to form a structure similar to a false bottom. Of course, the upper stator 200 also needs to be directly or indirectly connected to the flotation tank 500 to achieve relative fixation of the upper stator 200 relative to the flotation tank 500. The specific connection method can be rotated as needed and will not be repeated here.

[0065] Example:

[0066] A flotation workshop of a coal preparation plant uses an XJM-S8 flotation machine for coal slime flotation. The flotation machine has three flotation chambers. An industrial test is conducted on the stirring device provided in this application in the coal preparation plant. The relevant parameters of the XJM-S8 flotation machine are as follows.

[0067] Single tank capacity: 8m 3 ;

[0068] Stirring motor power model: Y200L2-6V6, power: 22kw;

[0069] Scraper diameter: 440-520mm;

[0070] Scraper speed: 25rpm;

[0071] Only the first chamber of the XJM-S8 flotation machine was modified, and the stirring mechanism in the first chamber was replaced with the Figure 1-8 The stirring mechanism shown in the figure was tested, and the diameter of the upper stator was equivalent to the outer diameter of the original stirring mechanism. During the test, only the first chamber of the XJM-S8 flotation machine was operated, and the latter two chambers were shut down.

[0072] The stirring mechanism speed of the first chamber of the XJM-S8 flotation machine of the coal preparation plant before the transformation was 970rpm. After replacing the stirring device provided by the present application, the speed was reduced to 750rpm during the flotation process, and other parameters of the flotation machine remained unchanged.

[0073] Industrial test conditions: slurry throughput is about 200m 3 / h, flotation feed concentration is 70g / L, collector is diesel, the amount of collector per ton of coal slime is 680g, frother is 2-octanol, the amount of frother per ton of coal slime is 121g, and the test results before and after the replacement of the stirring mechanism are shown in Table 1.

[0074] Table 1 Comparison of effects before and after transformation

[0075]

[0076] It can be seen from the test results in Table 1 that after replacing the stirring mechanism in the first chamber of the XJM-S8 flotation machine, even if the rotation speed of the stirring mechanism is reduced, the flotation effect is significantly improved. When the ash content of the feed is similar, the ash content of the flotation clean coal is reduced by 1.51%, the flotation clean coal yield is increased by 6.01%, and the flotation improvement index is improved by 10.88%. It can be seen that the stirring device provided by the present application can not only achieve a better sorting effect than the original stirring mechanism, but also significantly reduce energy consumption.

[0077] The corresponding arrangement positions and connection relationships of the structures not described in the present application, the mutual timing and control parameters of the steps not described may refer to similar devices and methods in the prior art. The connection relationships, operations and working principles of the structures not described are known to ordinary technicians in the field and will not be described in detail here.

[0078] Some embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referenced to each other.

[0079] The above are only specific embodiments of the present invention, which enable those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A stirring device for a flotation machine, characterized in that: It comprises a rotor (100), an upper stator (200) and a lower stator (300), wherein: The rotor (100) comprises a stirring shaft (110), a guide plate (120), a support frame (130), a first stirring rod (140) and a second stirring rod (150); the guide plate (120) is provided in plurality and is fixed around the stirring shaft (110); the support frame (130) is connected to the stirring shaft (110); the first stirring rod (140) and the second stirring rod (150) are both provided in plurality and are parallel to the stirring shaft (110); the first stirring rod (140) and the second stirring rod (150) are respectively connected to opposite sides of the support frame (130); The upper stator (200) comprises an air inlet pipe (210), an upper support plate (220) perpendicular to the stirring shaft (110), and a plurality of third stirring rods (230) vertically arranged on the same side of the upper support plate (220); the upper support plate (220) is sleeved outside the stirring shaft (110); and a through slurry circulation hole (240) is opened on the upper support plate (220); The lower stator (300) comprises a lower support plate (310) perpendicular to the stirring shaft (110) and a plurality of fourth stirring rods (320) vertically arranged on the same side of the lower support plate (310); the lower support plate (310) is sleeved outside the stirring shaft (110); and a through slurry feeding hole (330) is opened on the lower support plate (310); A working area (400) is formed between the upper support plate (220) and the lower support plate (310), and the working area (400) includes a negative pressure area (410) in the middle and a high-energy mineralization area (420) surrounding the negative pressure area (410); the guide plate (120) is located in the negative pressure area (410); the first stirring rod (140), the second stirring rod (150), the third stirring rod (230) and the fourth stirring rod (320) are located in the high-energy mineralization area (420); the first stirring rod (140) and the third stirring rod (230) are arranged alternately, and the second stirring rod (150) and the fourth stirring rod (320) are arranged alternately; the air inlet pipe (210), the slurry circulation hole (240) and the slurry feeding hole (330) are all connected to the negative pressure area (410).

2. The stirring device for flotation machine according to claim 1, characterized in that: The guide plate (120) is arc-shaped, and a plurality of the guide plates (120) are evenly distributed along the circumference of the stirring shaft (110).

3. The stirring device for flotation machine according to claim 2, characterized in that: The surface of the guide plate (120) is a cylinder, and the generatrix of the cylinder is parallel to the axis of the stirring shaft (110).

4. The stirring device for flotation machine according to claim 1, characterized in that: The support frame (130) is a support rod perpendicular to the stirring shaft (110), and a plurality of support rods are provided and radially surrounded and fixed on the stirring shaft (110).

5. The stirring device for flotation machine according to claim 4, characterized in that: A plurality of the first stirring rods (140) and the second stirring rods (150) are arranged at intervals along the extension direction of the support rod.

6. The stirring device for flotation machine according to claim 1, characterized in that: The first stirring rod (140), the second stirring rod (150), the third stirring rod (230) and the fourth stirring rod (320) are all arranged in a circular array with the axis of the stirring shaft (110) as the center.

7. The stirring device for flotation machine according to claim 1, characterized in that: The air inlet pipe (210) is a hollow shaft sleeved on the outside of the stirring shaft (110), and an air inlet channel is formed between the inner wall of the hollow shaft and the stirring shaft (110).

8. A flotation machine, characterized in that: include: Flotation tank (500); According to the stirring device as described in any one of claims 1 to 7, the guide plate (120), the support frame (130), the first stirring rod (140), the second stirring rod (150), the upper support plate (220), the third stirring rod (230) and the lower stator (300) are all located inside the flotation tank (500).

9. The flotation machine according to claim 8, characterized in that: One end of the lower support plate (310) is connected to the side wall of the flotation tank (500), and the flotation tank (500) is provided with an inlet (510), and the inlet (510) communicates with the area between the lower support plate (310) and the bottom wall of the flotation tank (500).

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