Opposite-flushing jet flotation machine and opposite-flushing jet flotation method

Abstract

The invention discloses a hedging jet flotation machine and a hedging jet flotation method. The flotation machine comprises a bubble water generator, a flow mixer, a mineralizing device and a flotation tank. The bubble water generator is connected with a water source and an air source, and air is cut into microbubbles through a microcellular foam maker to form bubble water. The flow mixer is connected with the output end of the generator and an ore pulp source, so that bubble water and ore pulp are mixed into bubble ore pulp flow; nozzles are arranged on the shell wall of the mineralizing device, and ore pulp flows ejected by the same group of nozzles converge in the cavity; the flotation tank is connected with the output end of the mineralizing device. The flotation method comprises the steps of preparing bubble water, mixing the bubble water with ore pulp to form ore pulp flows, oppositely flushing multiple strands of ore pulp flows, separating bubbles from liquid and the like. The bubble water is separated from the mineralization function space, and the microcellular foam maker is only in contact with clear water, so that ore pulp particle blockage is avoided; compressed air does not need to be additionally injected into the mineralizing device, disturbance airflow does not exist, the hedging jet flow integrity and turbulence intensity are guaranteed, the collision probability of micro-fine particle minerals and bubbles is improved, and the mineralizing effect is optimized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flotation, in particular to a counter-impinging jet flotation machine and a counter-impinging jet flotation method. BACKGROUND

[0002] Flotation is a method for realizing separation of different minerals by treating the difference in hydrophobicity of mineral surfaces with reagents, and realizing mineralization by collision and adhesion of bubbles and hydrophobic minerals in the ore pulp, and then collecting the mineralized bubbles to the froth layer, and leaving the hydrophilic minerals in the ore pulp to form the underflow product.

[0003] The mineralization in the flotation process refers to the process of collision and effective adhesion of hydrophobic mineral particles and bubbles, and the effect of mineralization is affected by the collision probability of target mineral particles and bubbles, and the higher the collision probability, the better the effect of mineralization.

[0004] The Jameson flotation machine is a widely used mixed flow mineralization flotation machine in the prior art, and a Venturi tube foamer is arranged at the upper part of the downpipe of the Jameson flotation machine. In the Venturi tube foamer, the high-speed ore pulp passing through the nozzle forms a jet flow under the action of the centrifugal pump, the high-speed ore pulp jet flow forms a negative pressure to suck in air and cut the air into micro-bubbles (the diameter of the micro-bubbles is generally 0.1-0.6mm), and at the same time, the target mineral particles in the ore pulp collide and adhere to the micro-bubbles to complete the mineralization process. When the Jameson flotation machine is used for mineral processing of micro-fine particles (generally refers to mineral particles with a particle size of less than 20μm), the size difference between the bubbles and the micro-fine particles is too large, and the fluid turbulence intensity generated by the one-way jet flow is insufficient, which leads to too low collision probability of the mineral particles and the bubbles.

[0005] Therefore, some people have proposed a technical solution of using nano-porous ceramic to generate smaller bubbles, and arranging two counter-impinging jet flows to improve the fluid turbulence intensity (such as a multi-phase mixed mineralization mixing method disclosed in Chinese patent document CN108283996B). However, in the technical solution, the nano-porous ceramic is arranged at the port of the spherical multi-phase mixed mineralizer and directly contacts the ore pulp, which is easy to cause blockage. Moreover, the compressed air jetted from the tubular micro-porous foamer is perpendicular to the directions of the two ore pulp jet flows jetted from the first tubular pulp conditioner and the second tubular pulp conditioner, which will interfere with the counter-impinging of the two ore pulp jet flows, thereby reducing the fluid turbulence intensity, i.e. reducing the collision probability of the mineral particles and the bubbles.

[0006] Therefore, it is necessary to further improve the above technical solution to improve the effect of mineralization. SUMMARY

[0007] The technical problem to be solved by the present application is to overcome the deficiencies of the nano-porous ceramic being easy to block and the compressed air interfering with the counter-impinging of the ore pulp jet flows in the prior art, and to provide a counter-impinging jet flotation machine and a counter-impinging jet flotation method.

[0008] The present application adopts the following technical solutions: The opposed jet flow flotation machine comprises a bubble water generator, a mixed flow device, a mineralizer and a flotation tank; the input end of the bubble water generator is connected with a water source and a gas source respectively, and the gas is cut by a micro-porous foaming device and then enters the water body to form bubble water; the input end of the mixed flow device is connected with the output end of the bubble water generator and a mineral slurry source respectively, and the bubble water is mixed with the mineral slurry to form a bubble mineral slurry flow; the mineralizer comprises a shell and at least one group of nozzles arranged on the shell wall and connected with the output end of the mixed flow device, and the bubble mineral slurry flows emitted by the nozzles in the same group meet in the cavity; the input end of the flotation tank is connected with the output end of the mineralizer. The structure completely separates the functions of "generating bubble water" and "mineralization" in space: the gas is cut into micro-bubbles in the bubble water generator and uniformly dispersed in the water to form bubble water, and then mixed with the mineral slurry in the mixed flow device to form a bubble mineral slurry flow. In this way, the micro-porous foaming device is always in contact with clean water, and the particles in the mineral slurry cannot enter the micro-porous structure, thereby fundamentally avoiding blockage; at the same time, because the mineral slurry has been mixed in the mixed flow device to form a bubble mineral slurry flow, compressed air does not need to be additionally injected in the mineralizer, so that a disturbed air flow is not formed, the integrity and turbulence intensity of the opposed jet flow are ensured, and the collision probability of the micro-fine mineral particles and the bubbles is significantly improved, thereby optimizing the mineralization effect.

[0009] The bubble water generator comprises a water inlet pipe connected with a water source and a gas inlet pipe connected with a gas source, and one end of the gas inlet pipe is connected with a micro-porous foaming device arranged in the water inlet pipe. The micro-porous foaming device is arranged in the water inlet pipe, so that the gas is cut into micro-bubbles and then taken away by the water flow. This structure arrangement can ensure that the micro-porous foaming device is not in contact with the mineral slurry, thereby avoiding blockage.

[0010] The mixed flow device is arranged as a Venturi mixer, the nozzle end of which is connected with the mineral slurry source, and the air inlet pipe end is connected with the output end of the bubble water generator. By using the Venturi effect, a negative pressure is formed when the mineral slurry passes through the nozzle at a high speed, and the bubble water is actively sucked in and instantaneously mixed intensively; compared with mechanical stirring or static mixing, the energy loss of the Venturi mixer is smaller and the mixing is more uniform, so that the bubbles in the bubble water can be uniformly dispersed into the mineral slurry, the mineralization preparation time is shortened, and the system processing capacity is improved.

[0011] The nozzles in the same group are located in the same plane, and the included angles between adjacent nozzles are equal. The nozzles in the same group are located in the same plane and have equal adjacent included angles, which can ensure that the bubble mineral slurry flows emitted by each nozzle meet in the cavity in a symmetrical manner, so that the interaction of each bubble mineral slurry flow is more balanced when the bubble mineral slurry flows collide. This avoids the situation that the turbulence intensity in some areas is insufficient due to improper nozzle position or included angle, ensures that the whole cavity of the mineralizer has a high and uniform turbulence intensity, thereby improving the collision probability of the mineral particles and the bubbles everywhere, and improving the overall mineralization effect.

[0012] The flow rate and flow volume of the bubble ore pulp streams emitted from each of the nozzles are equal. This arrangement can make the impact force of each bubble ore pulp stream equal when colliding, ensuring that the turbulent state formed after the collision is stable and strong. If the flow rate or flow volume is not equal, one bubble ore pulp stream may dominate when colliding, which cannot form an effective strong turbulent flow, and thus affects the collision of mineral particles and bubbles. Therefore, the equal flow rate and flow volume of the bubble ore pulp streams emitted from each of the nozzles can ensure the effectiveness of the collision, and further improve the mineralization effect.

[0013] The input port of the flotation tank is located at a distance of not more than 1 / 10 of the total height of the tank body column segment from the bottom of the tank body column segment. The input port is arranged in the lower part of the flotation tank, so that the bubble ore pulp stream after the collision can enter from the lower part of the tank body, facilitating the target mineral particles carried by the bubbles to float upwards to the surface of the ore pulp, while the hydrophilic non-target mineral particles sink downwards, reducing the interference of improper input position on the separation process. Compared with the problem of insufficient separation caused by the input port arranged at the top, the middle and lower input is more conducive to the efficient separation of bubbles and liquid, improving the efficiency of flotation.

[0014] The input ports are located in the same plane, and the included angles between adjacent input ports are equal. The input ports located in the same plane and the equal adjacent included angles can make the bubble ore pulp stream entering the flotation tank diffuse in a symmetrical manner, avoiding the uneven distribution of the bubble ore pulp stream in the tank. Ensuring that the bubble ore pulp stream state is consistent everywhere in the tank is conducive to the full separation of bubbles and liquid everywhere in the tank, ensuring the overall separation effect in the flotation tank and improving the uniformity and stability of mineral processing.

[0015] The flow rate and flow volume of the bubble ore pulp streams emitted from each of the input ports are equal. The equal flow rate and flow volume of the bubble ore pulp streams emitted from each input port can make the bubble ore pulp streams diffuse uniformly after entering the flotation tank, without disturbing the flow field in the tank due to the excessive flow rate or flow volume of a certain input port, ensuring the stability of the environment in the flotation tank. A stable flow field is conducive to the upward floating of target mineral particles carried by bubbles, and also conducive to the sinking of non-target mineral particles, further improving the separation effect of bubbles and liquid and enhancing the reliability of flotation.

[0016] The opposed jet flotation method comprises the following steps: Step S1, preparing bubble water; Step S2, mixing the bubble water with the ore pulp to form a bubble ore pulp stream; Step S3, colliding two or more bubble ore pulp streams; Step S4, separating bubbles and liquid for the bubble ore pulp stream after the collision.

[0017] This method completely separates the two functions of "generating bubble water" and "mineralization" spatially: the gas is first cut into microbubbles in the bubble water generator and evenly dispersed in the water to form bubble water, which is then mixed with the mineral slurry in the mixer to form a bubble slurry flow. In this way, the microporous bubbler is always in contact with clean water, and particles in the mineral slurry will not enter the microporous structure, fundamentally avoiding clogging; at the same time, because the mineral slurry has already formed a bubble slurry flow by mixing in the mixer, there is no need to inject additional compressed air in the mineralizer, so no turbulent airflow is formed, ensuring the integrity of the counter-jet and the intensity of turbulence, thereby significantly increasing the collision probability between mineral particles and bubbles and optimizing the mineralization effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a counter-jet flotation machine.

[0019] The labels in the diagram represent: 01. Water source; 02. Gas source; 03. Slurry source; 1. Aerated water generator; 11. Microporous foamer; 12. Water supply pipe; 13. Aerated water supply pipe; 2. Mixer; 21. Nozzle end; 22. Inlet pipe end; 3. Mineralizer; 31. Shell; 32. Nozzle; 4. Flotation cell; 41. Input port. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example like Figure 1 As shown, in this embodiment, the jet flotation machine includes a bubble water generator 1, a mixer 2, a mineralizer 3, and a flotation cell 4.

[0022] The input end of the bubble water generator 1 is connected to the water source 01 and the gas source 02 respectively. The gas enters the water body after being cut by the microporous bubbler 11 to form bubble water. Specifically, the microporous bubbler 11 is made of nanoporous ceramic. The bubble water generator 1 includes a water supply pipe 12 connected to the water source 01 and a gas supply pipe 13 connected to the gas source 02. One end of the gas supply pipe 13 is connected to the microporous bubbler 11 built into the water supply pipe 12.

[0023] The input end of the mixer 2 is connected to the output end of the bubble water generator 1 and the slurry source 03 respectively. The bubble water and the slurry are mixed to form a bubble slurry flow. Specifically, the mixer 2 is configured as a Venturi mixer, with its nozzle end 21 connected to the slurry source 03 and its air inlet end 22 connected to the output end of the bubble water generator 1.

[0024] The mineralizer 3 comprises a shell 31, and at least one group of nozzles 32 arranged on the shell wall and communicating with the output end of the mixed flow device 2, and the bubble slurry streams emitted by the nozzles in the same group meet in the cavity; specifically, the nozzles in the same group are located in the same plane, and the included angles between adjacent nozzles are equal; and the flow rates and flow volumes of the bubble slurry streams emitted from the nozzles are equal.

[0025] The input end of the flotation tank 4 communicates with the output end of the mineralizer 3; specifically, the input ports 41 of the flotation tank 4 are located at a distance of not more than 1 / 10 of the total height of the tank body column segment from the bottom of the tank body column segment; the input ports 41 are located in the same plane, and the included angles between adjacent input ports 41 are equal; and the flow rates and flow volumes of the bubble slurry streams emitted from the input ports 41 are equal.

[0026] In the embodiment, the impinging jet flow flotation method comprises the following steps: Step S1, preparing bubble water; Step S2, mixing the bubble water with the slurry to form a bubble slurry stream; Step S3, impinging two or more bubble slurry streams; Step S4, separating the bubbles from the liquid in the impinged bubble slurry stream.

[0027] Although the present application has been disclosed with reference to the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art, without departing from the scope of the present application, can make many possible changes and modifications to the above-mentioned technical content, or modify equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the content of the present application, shall fall within the scope of protection of the present application.

Claims

1. A collision jet flotation machine, characterised in that The application relates to a bubble water generator (1), a mixing device (2), a mineralizer (3) and a flotation tank (4). The bubble water generator (1) is connected with a water source (01) and a gas source (02) respectively, and the gas is cut by a micro-hole foaming device (11) and then enters the water body to form bubble water. The mixing device (2) is connected with the output end of the bubble water generator (1) and a mineral slurry source (03) respectively, and the bubble water and the mineral slurry are mixed to form a bubble mineral slurry flow. The mineralizer (3) comprises a shell (31) and at least one group of nozzles (32) arranged on the shell wall and connected with the output end of the mixing device (2), and the bubble mineral slurry flows discharged from the nozzles (32) in the same group meet in the cavity. The input end of the flotation tank (4) is connected with the output end of the mineralizer (3).

2. The opposed jet flotation machine of claim 1, characterized in that: The bubble water generator (1) comprises a water conveying pipe (12) connected with the water source (01) and a gas conveying pipe (13) connected with the gas source (02), and one end of the gas conveying pipe (13) is connected with the micro-hole foaming device (11) arranged in the water conveying pipe (12).

3. The opposed jet flotation machine of claim 1, wherein: The mixing device (2) is arranged as a Venturi mixer, the nozzle end (21) of which is connected with the mineral slurry source (03), and the air inlet pipe end (22) is connected with the output end of the bubble water generator (1).

4. The opposed jet flotation machine of claim 1, wherein: The nozzles (32) in the same group are located in the same plane, and the included angles between adjacent nozzles (32) are equal.

5. The opposed jet flotation machine of claim 4, wherein: The flow rates and flow volumes of the bubble mineral slurry flows discharged from the nozzles (32) are equal.

6. The opposed jet flotation machine of claim 1, wherein: The input ports (41) of the flotation tank (4) are located in the same plane, and the included angles between adjacent input ports (41) are equal.

7. The opposed jet flotation machine of claim 6, wherein: The flow rates and flow volumes of the bubble mineral slurry flows discharged from the input ports (41) are equal.

8. The opposed jet flotation machine of claim 7, wherein: The application further discloses a bubble water preparation method.

9. A method of opposed jet flotation, characterised in that The bubble water is prepared in step S1. The bubble water is mixed with the mineral slurry to form a bubble mineral slurry flow in step S2. Two or more bubble mineral slurry flows are collided in step S3. The bubble mineral slurry flow after the collision is separated into bubbles and liquid in step S4. ​

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