A combined foaming mineral flotation machine

Abstract

The present invention discloses a combined foaming and mineralizing flotation machine, which comprises a flotation cylinder, a jet foaming mechanism, an air inlet pipe and a stirring and foaming mechanism. The flotation cylinder has a flotation chamber for containing pulp. An ore inlet, an ore discharge port and a foam discharge port communicating with the flotation chamber are formed in the flotation cylinder. The foam discharge port is located above the ore inlet. The jet foaming mechanism includes a Venturi tube and a nozzle assembly. Both ends of the Venturi tube are open. One end of the Venturi tube is communicated with the ore inlet. At least one air inlet hole is formed in the side wall of the Venturi tube. The outlet of the nozzle assembly is communicated with the other end of the Venturi tube. The beneficial effects of the present invention are as follows: It can realize the flotation of fine-grained minerals and coarse-grained minerals in the pulp, thereby improving the flotation recovery rate of all particle-size minerals and enhancing the flotation separation accuracy and flotation efficiency of the flotation machine.

Description

Technical Field

[0001] The present invention relates to the technical field of flotation equipment, and particularly relates to a combined foaming and mineralization flotation machine. Background Art

[0002] Flotation is the most commonly used method for mineral separation. During the flotation process, particles collide with bubbles under the action of turbulence. Hydrophobic particles adhere to the surface of the bubbles and rise to the foam layer with the bubbles, while hydrophilic particles remain in the pulp to achieve material separation. Bubbles, as the carrier of flotation, have a significant impact on the flotation process. In industrial applications, most flotation bubbles adopt mechanical agitation foaming and jet foaming technologies.

[0003] During mechanical agitation foaming (such as a hybrid mineral flotation machine disclosed in the patent application No. 201710251944.X), when the impeller rotates at a high speed, a negative pressure area is formed between the impeller and the stator, sucking air from the air inlet pipe. Under the strong agitation of the impeller, the sucked air is divided into small bubbles and dispersed into the pulp, colliding with the hydrophobic mineral particles in the pulp. The mineral particles adhere to the bubbles to form mineralized bubbles, and the separation process is completed in the flotation machine. A large number of studies have found that the bubble diameter generated by using mechanical agitation foaming technology exceeds 0.5 mm, which is suitable for the flotation of mineral particles with D80 > 19 μm. However, the flotation recovery efficiency of fine-grained minerals with D80 < 19 μm is not high, resulting in a large amount of already monomer-dissociated fine mineral particles being lost in the tailings. Therefore, the mechanical agitation foaming and mineralization method does not have an advantage in fine-grained flotation.

[0004] During jet foaming (such as a jet flotation machine disclosed in the patent application No. 201220751874.7), the pulp forms a high-speed jet through the nozzle convergence and acceleration. The jet flow velocity is much higher than the flow velocity of the surrounding air particles, and there is a velocity gradient between them, generating a shear force. The jet particles and the air particles exchange positions, and the air is sucked into the jet and forms a local vacuum around it. The air is continuously sucked in and broken into a large number of bubbles under the action of the high-intensity shear force in the jet and released after pressure relief. The bubble diameter generated by the jet flotation machine using jet foaming is smaller than that generated by mechanical agitation foaming. Jet foaming has the advantages of good foaming performance, suitable bubble size, and uniform foaming, which is beneficial to mineralization. In addition, the jet foamer does not require a mechanical agitation device and a compressed air system, has low energy consumption, and generates little noise. However, the hybrid power of the pulp and air in the jet flotation machine is insufficient, and its adaptability to the pulp feed concentration and particle size is poor. There is a mixing dead zone around the central pulp feed pipe, resulting in unstable operation and low flotation efficiency.

[0005] A large number of theoretical studies have proven that millimeter-sized bubbles are beneficial for the flotation of coarse-grained minerals, while micro-nano bubbles are beneficial for the flotation of fine-grained minerals. Therefore, there is an urgent need for a combined foaming method that can generate both millimeter-sized bubbles and micro-nano bubbles to maximize the flotation recovery rate of all particle-size minerals, improve the flotation separation accuracy and flotation efficiency. Summary of the Invention

[0006] The purpose of the present invention is to overcome the above technical deficiencies and propose a combined foaming and mineralization flotation machine to solve the technical problems in the prior art that the flotation machine cannot simultaneously generate millimeter-sized bubbles and micro-nano bubbles, resulting in a relatively low flotation recovery rate of all particle-size minerals by the flotation machine, as well as relatively low flotation separation accuracy and flotation efficiency.

[0007] To achieve the above technical objectives, the technical solution of the present invention provides a combined foaming and mineralization flotation machine, including:

[0008] A flotation cylinder, the flotation cylinder has a flotation chamber for containing pulp, and the flotation cylinder is provided with a pulp inlet, a pulp outlet and a foam outlet communicating with the flotation chamber, and the foam outlet is located above the pulp inlet;

[0009] A jet foaming mechanism, the jet foaming mechanism includes a Venturi tube and a nozzle assembly. Both ends of the Venturi tube are open. One end of the Venturi tube is communicated with the pulp inlet, at least one air inlet hole is opened on the side wall of the Venturi tube, and the outlet of the nozzle assembly is communicated with the other end of the Venturi tube to inject pulp into the Venturi tube and generate micro-nano bubbles;

[0010] An air inlet pipe, the upper end of the air inlet pipe is located outside the flotation chamber, and the lower end of the air inlet pipe extends into the pulp;

[0011] A stirring foaming mechanism, the stirring foaming mechanism is used to stir the pulp in the flotation chamber to suspend the pulp and form a negative pressure to generate millimeter-sized bubbles.

[0012] Further, the upper surface of the flotation chamber is open, and the pulp outlet is located on the opposite side of the pulp inlet and is symmetrically arranged with the pulp inlet.

[0013] Further, the Venturi tube includes a suction tube, a throat tube and a diffuser tube. The two ends of the throat tube are respectively communicated with one end of the suction tube and the diffuser tube. The other end of the diffuser tube is communicated with the pulp inlet, and the outlet of the nozzle assembly is communicated with the other end of the suction tube. Each of the air inlet holes is opened on the side wall of the suction tube.

[0014] Further, the nozzle assembly includes an inner nozzle and an outer nozzle which are concentrically arranged. The outlets of the inner nozzle and the outer nozzle are both communicated with the other end of the suction pipe. The inner nozzle is a linear jet, and the outer nozzle is a rotary jet.

[0015] Further, the jet foaming mechanism further includes at least one support rod, a plurality of spiral vanes and a plurality of bumps. Each of the support rods is arranged in the diffuser tube in parallel along the length direction of the diffuser tube and is fixedly connected to the diffuser tube. Each of the spiral vanes is arranged in the diffuser tube at intervals along the length direction of the diffuser tube and is fixed on each of the support rods. A plurality of through holes are formed in the spiral vanes. Each of the bumps is arranged in the diffuser tube at intervals along the length direction of the diffuser tube and is fixed on the inner wall of the diffuser tube. The bump is a hexagonal structure.

[0016] Further, the stirring and foaming mechanism includes a rotating shaft, an impeller, a stator and a rotation driving member. The rotating shaft is coaxially and vertically arranged in the flotation chamber. The upper end of the rotating shaft is rotatably installed on the flotation cylinder. The impeller is coaxially fixed to the lower end of the rotating shaft. The stator is circumferentially arranged outside the impeller and is fixed to the bottom of the flotation chamber. The rotation driving member is fixed on the flotation cylinder, and the output end of the rotation driving member is fixedly connected to the upper end of the rotating shaft for driving the rotating shaft to rotate.

[0017] Further, the air inlet pipe is vertically arranged, and the lower end of the air inlet pipe is located at the impeller.

[0018] Further, the impeller includes an upper cover plate and a plurality of first blades. The upper cover plate is fixed to the lower end of the rotating shaft. Each of the first blades is circumferentially arranged outside the rotating shaft. The inner sides of each of the first blades are fixedly connected to the rotating shaft. The upper ends of each of the first blades are fixedly connected to the upper cover plate. The outer edge of the first blade is a broken line structure.

[0019] Further, the stator includes a plurality of second blades. Each of the second blades is circumferentially arranged outside the impeller. The outer edge of the second blade is a straight line structure parallel to the rotating shaft, and the inner edge of the second blade is a broken line structure.

[0020] Further, the combined foaming and mineralization flotation machine further includes a driving pump. The outlet of the driving pump is communicated with the inlets of the inner nozzle and the outer nozzle for pumping pulp into the inner nozzle and the outer nozzle.

[0021] Compared with the prior art, the beneficial effects of the present invention include: during use, the pulp is sprayed into the Venturi tube along the outlet of the nozzle assembly. Since the pulp forms a high-speed jet through the convergence and acceleration of the nozzle assembly, the flow velocity of the jet particles is much higher than that of the surrounding air particles. There is a velocity gradient between the two, generating a shear force. The jet particles and the air particles are displaced, and the air is sucked into the jet and forms a local vacuum around it. The external air is continuously sucked in along each air inlet hole. The air sucked into the jet is broken into a large number of micro-nano bubbles under the action of the high-intensity shear force in the jet, so that the fine-grained minerals in the pulp adhere to the micro-nano bubbles to form mineralized bubbles, realizing the flotation of the fine-grained minerals. At the same time, by controlling the stirring and foaming mechanism, the stirring and foaming mechanism stirs the pulp in the flotation chamber to suspend the pulp, and at the same time forms a negative pressure so that the external air is continuously sucked into the pulp along the air inlet pipe. The air sucked into the pulp is divided into millimeter bubbles under the strong stirring action of the stirring and foaming mechanism and diffused into the pulp, colliding with the hydrophobic mineral particles in the pulp, so that the coarse-grained minerals adhere to the millimeter bubbles to form mineralized bubbles, realizing the flotation of the coarse-grained minerals. As the mineralized bubbles increase continuously, the mineralized bubbles rise and are discharged from the bubble discharge port, completing the flotation of the fine-grained minerals and coarse-grained minerals in the pulp, thereby improving the flotation recovery rate of all particle-size minerals and the flotation separation accuracy and flotation efficiency of the flotation machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of a combined foaming and mineralization flotation machine provided by the present invention;

[0023] Figure 2 is Figure 1 a schematic structural diagram of a jet foaming mechanism of a combined foaming and mineralization flotation machine in

[0024] Figure 3 is Figure 2 a schematic structural diagram of the connection relationship of the diffusion tube, the spiral blade and the convex block in

[0025] In the figure: 100 - flotation cylinder, 110 - flotation chamber, 120 - ore inlet, 130 - ore discharge port, 140 - bubble discharge port, 200 - jet foaming mechanism, 210 - Venturi tube, 211 - air inlet hole, 212 - suction pipe, 213 - throat tube, 214 - diffusion tube, 220 - nozzle assembly, 221 - inner nozzle, 222 - outer nozzle, 230 - support rod, 240 - spiral blade, 241 - through hole, 250 - convex block, 300 - air inlet pipe, 400 - stirring and foaming mechanism, 410 - rotating shaft, 420 - impeller, 421 - upper cover plate, 422 - first blade, 430 - stator, 431 - second blade, 440 - rotation driving member, 500 - driving pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The present invention provides a combined foaming and mineralizing flotation machine, the structure of which is as Figure 1 and Figure 2 shown, including a flotation cylinder 100, a jet foaming mechanism 200, an air inlet pipe 300 and a stirring and foaming mechanism 400. The flotation cylinder 100 has a flotation chamber 110 for containing pulp. An ore inlet 120, an ore discharge port 130 and a foam discharge port 140 communicating with the flotation chamber 110 are provided on the flotation cylinder 100. The foam discharge port 140 is located above the ore inlet 120. The jet foaming mechanism 200 includes a Venturi tube 210 and a nozzle assembly 220. Both ends of the Venturi tube 210 are open. One end of the Venturi tube 210 is communicated with the ore inlet 120. At least one air inlet hole 211 is provided on the side wall of the Venturi tube 210. The outlet of the nozzle assembly 220 is communicated with the other end of the Venturi tube 210 to inject pulp into the Venturi tube 210 and generate micro-nano bubbles. The upper end of the air inlet pipe 300 is located outside the flotation chamber 110, and the lower end of the air inlet pipe 300 extends into the pulp. The stirring and foaming mechanism 400 is used to stir the pulp in the flotation chamber 110 to suspend the pulp and form a negative pressure to generate millimeter-sized bubbles.

[0028] During use, the pulp is sprayed into the Venturi tube 210 along the outlet of the nozzle assembly 220. Since the pulp forms a high-speed jet through the convergence and acceleration of the nozzle assembly 220, the flow velocity of the jet particles is much higher than that of the surrounding air particles. There is a velocity gradient between the two, generating a shear force. The jet particles and the air particles are displaced, and the air is sucked into the jet and forms a local vacuum around it. The external air is continuously sucked in along each intake hole 211. The air sucked into the jet is broken into a large number of micro-nano bubbles under the action of the high-intensity shear force in the jet, causing the fine-grained minerals in the pulp to adhere to the micro-nano bubbles to form mineralized bubbles, realizing the flotation of the fine-grained minerals. At the same time, by controlling the stirring and foaming mechanism 400, the stirring and foaming mechanism 400 stirs the pulp in the flotation chamber 110 to suspend the pulp, and at the same time forms a negative pressure so that the external air is continuously sucked into the pulp along the air inlet pipe 300. The air sucked into the pulp is divided into millimeter bubbles under the strong stirring action of the stirring and foaming mechanism 400 and diffused into the pulp, colliding with the hydrophobic mineral particles in the pulp, causing the coarse-grained minerals to adhere to the millimeter bubbles to form mineralized bubbles, realizing the flotation of the coarse-grained minerals. As the mineralized bubbles continue to increase, the mineralized bubbles rise and are discharged from the bubble discharge port 140, completing the flotation of the fine-grained minerals and coarse-grained minerals in the pulp, thereby improving the flotation recovery rate of all particle-size minerals and the flotation separation accuracy and flotation efficiency of the flotation machine.

[0029] As a preferred embodiment, please refer to Figure 1 , the bottom of the flotation cylinder 100 is of a U-shaped structure to reduce the wall hanging rate of the pulp.

[0030] As a preferred embodiment, please refer to Figure 1 , the upper surface of the flotation chamber 110 is open, and the discharge port 130 is located on the opposite side of the ore inlet 120 and is symmetrically arranged with the ore inlet 120 so that the pulp after flotation can be discharged along the discharge port 130.

[0031] As a preferred embodiment, please refer to Figure 2, the Venturi tube 210 includes a suction tube 212, a throat tube 213, and a diffuser tube 214. Both ends of the throat tube 213 are respectively communicated with one end of the suction tube 212 and the diffuser tube 214. The other end of the diffuser tube 214 is communicated with the ore inlet 120. The outlet of the nozzle assembly 220 is communicated with the other end of the suction tube 212. Each air inlet hole 211 is opened on the side wall of the suction tube 212. Both ends of the throat tube 213 are in a flared shape, which is convenient for the two ends of the throat tube 213 to be communicated with one end of the suction tube 212 and the diffuser tube, so that external air can enter the suction tube 212 along the air inlet holes 211. The pulp can form a jet flow in the throat tube 213 under the action of the nozzle assembly 220 and enter the diffuser tube 214. Under the action of the diffuser tube 214, by arranging the spiral blades 240 and the bumps 250 in the diffuser tube 214, the shear turbulence degree of the pulp and the bubbles can be increased, the mineralization effect can be improved, and it is beneficial to improve the flotation recovery rate.

[0032] As a preferred embodiment, please refer to Figure 2 , the nozzle assembly 220 includes a concentric inner nozzle 221 and an outer nozzle 222. The outlets of both the inner nozzle 221 and the outer nozzle 222 are communicated with the other end of the suction tube 212. The inner nozzle 221 is a linear jet, and the outer nozzle 222 is a rotary jet, which is beneficial to strengthening the hydrodynamic cavitation effect and the shear mixing effect, generating more micro-nano bubbles with smaller diameters, and preferentially precipitating the micro-nano bubbles on the surface of hydrophobic minerals.

[0033] As a preferred embodiment, please refer to 2 and Figure 3, the jet foaming mechanism 200 further includes at least one support rod 230, a plurality of spiral blades 240 and a plurality of bumps 250. Each of the support rods 230 is arranged in parallel with the length direction of the diffusion tube 214 in the diffusion tube 214 and fixedly connected to the diffusion tube 214, so that each of the spiral blades 240 can be arranged in the diffusion tube 214 along the length direction of the diffusion tube 214 and fixed on each of the support rods 230, thereby providing a supporting effect on each of the spiral blades 240. Each of the spiral blades 240 is arranged in the diffusion tube 214 at intervals along the length direction of the diffusion tube 214 and fixed on each of the support rods 230. A plurality of through holes 241 are formed in the spiral blade 240. Each of the bumps 250 is arranged in the diffusion tube 214 at intervals along the length direction of the diffusion tube 214 and fixed on the inner wall of the diffusion tube 214. The bump 250 has a hexagonal structure. By arranging the spiral blades 240 and the bumps 250 in the diffusion tube 214, the shear turbulence degree of the pulp and bubbles can be increased, the mineralization effect can be improved, and it is beneficial to improve the flotation recovery rate.

[0034] As a preferred embodiment, please refer to Figure 1 , the stirring and foaming mechanism 400 includes a rotating shaft 410, an impeller 420, a stator 430 and a rotation driving member 440. The rotating shaft 410 is coaxially and vertically arranged in the flotation chamber 110. The upper end of the rotating shaft 410 is rotatably installed on the flotation cylinder 100. The impeller 420 is coaxially fixed to the lower end of the rotating shaft 410. The stator 430 is circumferentially arranged outside the impeller 420 and fixed to the bottom of the flotation chamber 110. The rotation driving member 440 is fixed to the flotation cylinder 100. The output end of the rotation driving member 440 is fixedly connected to the upper end of the rotating shaft 410 for driving the rotating shaft 410 to rotate. By controlling the rotation driving member 440, the rotation driving member 440 can drive the rotating shaft 410 to rotate and drive the impeller 420 to rotate, so that a negative pressure area is formed between the impeller 420 and the stator 430, which is convenient for the air outside the flotation chamber 110 to be inhaled.

[0035] As a preferred embodiment, please refer to Figure 1 , the air inlet pipe 300 is vertically arranged, and the lower end of the air inlet pipe 300 is located at the impeller 420, so that the air outside the flotation chamber 110 can be inhaled along the air inlet pipe 300 into the negative pressure area formed between the impeller 420 and the stator 430, and the air in the negative pressure area is strongly stirred by the impeller 420 and is divided into millimeter-sized bubbles and dispersed into the pulp.

[0036] As a preferred embodiment, please refer toFigure 1 , the impeller 420 includes an upper cover plate 421 and a plurality of first blades 422. The upper cover plate 421 is fixed to the lower end of the rotating shaft 410. Each of the first blades 422 is circumferentially arranged outside the rotating shaft 410. The inner side of each of the first blades 422 is fixedly connected to the rotating shaft 410, and the upper end of each of the first blades 422 is fixedly connected to the upper cover plate 421. The outer edge of the first blade 422 is a broken line structure, and each section of the broken line forms a certain angle with the rotating shaft 410, which can improve the shearing effect of the impeller 420 on the air in the negative pressure area.

[0037] As a preferred embodiment, please refer to Figure 1 , the stator 430 includes a plurality of second blades 431. Each of the second blades 431 is circumferentially arranged outside the impeller 420. The outer edge of the second blade 431 is a straight line structure parallel to the rotating shaft 410, and the inner edge of the second blade 431 is a broken line structure. The upper half of the broken line is parallel to the rotating shaft 410, and the lower half of the broken line forms a certain angle with the rotating shaft 410, so that a negative pressure area can be better formed between each of the second blades 431 and the corresponding first blade 422, facilitating the air outside the flotation chamber 110 to be sucked into the negative pressure area along the air inlet pipe 300.

[0038] As a preferred embodiment, please refer to Figure 1 , the combined foaming and mineralization flotation machine further includes a driving pump 500. The outlet of the driving pump 500 is communicated with the inlets of the inner nozzle 221 and the outer nozzle 222. The inlet of the driving pump 500 extends into the pulp, and is used to pump pulp into the inner nozzle 221 and the outer nozzle 222, so that the pulp can be continuously pumped into the inner nozzle 221 and the outer nozzle 222 under the action of the driving pump 500, and thus a jet flow is formed under the action of the inner nozzle 221 and the outer nozzle 222.

[0039] Compared with the conventional mechanical agitation and air - suction type flotation machine, the combined foaming and mineralization flotation machine provided by the present invention has a faster flotation rate and higher efficiency. When used for phosphate ore flotation, the grade of flotation concentrate can be increased by about 1.5%, the recovery rate can be increased by about 8%, the flotation time is shortened by about 25%, and the flotation efficiency is significantly improved. The following is a comparative test example of separating colloidal phosphate ore using the combined foaming and mineralization flotation machine provided by the present invention and a conventional mechanical agitation and air - suction type flotation machine.

[0040] The ore sample used in the experiment is the phosphate ore from Shennongjia, Hubei. The main chemical components (w / %) are: P2O5 23.40, MgO 8.32, SiO2 9.52, Al2O3 1.89, CaO 39.85, Fe2O3 1.31. Under the same reagent conditions, a roughing contrast test of reverse flotation was carried out. The flotation foam product is tailings, and the bottom product of the flotation chamber 110 is phosphate concentrate. The best flotation results are shown in Table 1.

[0041] Table 1 Results of the flotation contrast test of the phosphate ore from Shennongjia, Hubei

[0042]

[0043] It can be seen from the results of the contrast test that when using the combined foaming mineralization flotation machine provided by the present invention to float the phosphate ore from Shennongjia, compared with the traditional mechanical agitation air - suction type flotation machine, the grade of P2O5 in the flotation concentrate can be increased by about 2%, the recovery rate of P2O5 can be increased by about 11%, and the beneficiation efficiency is increased by 6.5%. The flotation time is shortened from 5 minutes to 4 minutes.

[0044] For a better understanding of the present invention, the following combines Figures 1 - 3 to elaborate in detail on the working principle of the technical solution of the present invention:

[0045] During use, the pulp is pumped into the inner nozzle 221 and the outer nozzle 222 under the action of the driving pump 500. The pulp is sprayed into the Venturi tube 210 along the outlets of the inner nozzle 221 and the outer nozzle 222. Since the pulp forms a high-speed jet through the convergence and acceleration of the inner nozzle 221 and the outer nozzle 222, the flow velocity of the jet particles is much higher than that of the surrounding air particles. There is a velocity gradient between the two, generating a shear force. The jet particles and the air particles are displaced, and the air is sucked into the jet and forms a local vacuum around it. The external air is continuously sucked in along each air inlet hole 211. The air sucked into the jet is broken into a large number of micro-nano bubbles under the action of the high-intensity shear force in the jet, enabling the fine-grained minerals in the pulp to adhere to the micro-nano bubbles to form mineralized bubbles, realizing the flotation of fine-grained minerals. At the same time, by controlling the rotation driving member 440, the rotation driving member 440 can be made to drive the rotation of the rotating shaft 410 and drive the impeller 420 to rotate, so that a negative pressure area is formed between the impeller 420 and the stator 430. The external air continuously enters the negative pressure area along the air inlet pipe 300. Under the strong stirring action of the impeller 420, the air is divided into millimeter-sized bubbles and dispersed into the pulp, colliding with the hydrophobic mineral particles in the pulp, enabling the coarse-grained minerals to adhere to the millimeter-sized bubbles to form mineralized bubbles, realizing the flotation of coarse-grained minerals. As the mineralized bubbles continue to increase, the mineralized bubbles rise and are discharged from the bubble discharge port 140, completing the flotation of the fine-grained minerals and coarse-grained minerals in the pulp, thereby improving the flotation recovery rate of all grain-size minerals and enhancing the flotation separation accuracy and flotation efficiency of the flotation machine.

[0046] A combined foaming and mineralizing flotation machine provided by the present invention has the following beneficial effects:

[0047] (1) By arranging the inner nozzle 221 and the outer nozzle 222, it is beneficial to strengthen the hydrodynamic cavitation effect and the shear mixing effect, generate more micro-nano bubbles with smaller diameters, and enable the micro-nano bubbles to precipitate preferentially on the surface of hydrophobic minerals. By arranging the spiral blade 240 and the convex block 250 in the diffusion tube 214, the shear turbulence degree of the pulp and the bubbles can be increased, the mineralization effect can be improved, and it is beneficial to improve the flotation recovery rate;

[0048] (2) The combined foaming and mineralizing flotation machine operates stably, has good adaptability to the pulp feed concentration and particle size, there is no mixing dead zone or dead corner in the flotation machine, the jet foaming mechanism 200 has less energy consumption, and the combined foaming and mineralization can reduce the stirring speed in the foaming and mineralization stage of the stirring foaming mechanism 400, and the overall energy consumption of the equipment is lower;

[0049] (3) In the present invention, the jet foaming mechanism 200 and the stirring foaming mechanism 400 are combined. During the foaming and mineralization stage of the jet foaming mechanism 200, a large number of micro-nano bubbles are generated, which is beneficial to the mineralization flotation of fine-grained minerals. During the foaming and mineralization stage of the stirring foaming mechanism 400, a large number of millimeter-sized bubbles are generated, which is beneficial to the mineralization flotation of coarse-grained minerals. At the same time, the micro-nano bubbles play a bridging role between the mineral particles and the millimeter-sized bubbles, improving the mineralization and flotation rates, and being beneficial to improving the recovery rate and separation accuracy of all-size minerals.

[0050] The specific embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A combined foaming and mineralizing flotation machine, characterized in that, Comprising: A flotation cylinder, which has a flotation chamber for containing pulp. The flotation cylinder is provided with a pulp inlet, a pulp outlet and a bubble discharge port communicating with the flotation chamber. The bubble discharge port is located above the pulp inlet. A jet foaming mechanism, which includes a Venturi tube and a nozzle assembly. Both ends of the Venturi tube are open. One end of the Venturi tube communicates with the pulp inlet. At least one air inlet hole is provided on the side wall of the Venturi tube. The outlet of the nozzle assembly communicates with the other end of the Venturi tube for injecting pulp into the Venturi tube and generating micro-nano bubbles. An air inlet pipe, the upper end of which is located outside the flotation chamber, and the lower end of which extends into the pulp. A stirring and foaming mechanism for stirring the pulp in the flotation chamber to suspend the pulp and form a negative pressure to generate millimeter-sized bubbles. The Venturi tube includes a suction tube, a throat tube and a diffuser tube. The two ends of the throat tube are respectively connected to one end of the suction tube and the diffuser tube. The other end of the diffuser tube communicates with the pulp inlet. The outlet of the nozzle assembly communicates with the other end of the suction tube. Each of the air inlet holes is provided on the side wall of the suction tube. The jet foaming mechanism further includes at least one support rod, a plurality of spiral blades and a plurality of bumps. Each of the support rods is arranged in parallel with the length direction of the diffuser tube in the diffuser tube and is fixedly connected to the diffuser tube. Each of the spiral blades is arranged at intervals along the length direction of the diffuser tube in the diffuser tube and is fixed to each of the support rods. A plurality of through holes are provided on the spiral blades. Each of the bumps is arranged at intervals along the length direction of the diffuser tube in the diffuser tube and is fixed to the inner wall of the diffuser tube. The bump is a hexagonal structure.

2. The combined foaming and mineralizing flotation machine according to claim 1, characterized in that, The upper surface of the flotation chamber is open, and the pulp outlet is located on the opposite side of the pulp inlet and is symmetrically arranged with the pulp inlet.

3. The combined foaming and mineralizing flotation machine according to claim 1, characterized in that, The nozzle assembly includes a concentric inner nozzle and outer nozzle. The outlets of the inner nozzle and the outer nozzle both communicate with the other end of the suction tube. The inner nozzle is a linear jet, and the outer nozzle is a rotary jet.

4. The combined foaming and mineralizing flotation machine according to claim 1, characterized in that, The stirring and foaming mechanism includes a rotating shaft, an impeller, a stator and a rotation driving member. The rotating shaft is coaxially and vertically arranged in the flotation chamber. The upper end of the rotating shaft is rotatably installed on the flotation cylinder. The impeller is coaxially fixed to the lower end of the rotating shaft. The stator is circumferentially arranged outside the impeller and is fixed to the bottom of the flotation chamber. The rotation driving member is fixed to the flotation cylinder, and the output end of the rotation driving member is fixedly connected to the upper end of the rotating shaft for driving the rotating shaft to rotate.

5. The combined foaming and mineralizing flotation machine according to claim 4, characterized in that, The air inlet pipe is vertically arranged, and the lower end of the air inlet pipe is located at the impeller.

6. The combined foaming and mineralizing flotation machine according to claim 5, characterized in that, The impeller includes an upper cover plate and a plurality of first blades. The upper cover plate is fixed to the lower end of the rotating shaft. Each of the first blades is circumferentially arranged outside the rotating shaft. The inner side of each first blade is fixedly connected to the rotating shaft, and the upper end of each first blade is fixedly connected to the upper cover plate. The outer edge of the first blade is a broken line structure.

7. The combined foaming and mineralizing flotation machine according to claim 6, characterized in that, The stator includes a plurality of second blades. Each of the second blades is circumferentially arranged outside the impeller. The outer edge of the second blade is a straight line structure parallel to the rotating shaft, and the inner edge of the second blade is a broken line structure.

8. The combined foaming and mineralizing flotation machine according to claim 3, characterized in that, It further includes a driving pump. The outlet of the driving pump is communicated with the inlets of the inner nozzle and the outer nozzle, and is used for pumping pulp into the inner nozzle and the outer nozzle.

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