Ore pulp activation device based on variable-pressure microbubble precipitation

Abstract

The invention discloses an ore pulp activation device based on variable-pressure microbubble precipitation, and belongs to the technical field of ore pulp activation devices, the ore pulp activation device comprises a slurry pump and a tubular differential pressure activator, a slurry outlet channel liquid path of the slurry pump is communicated with the inner end of the differential pressure activator, and a liquid path at the outer end of the differential pressure activator is communicated with a rotational flow activation tank; a slurry inlet channel of the rotational flow activation tank is arranged on the outer surface of the rotational flow activation tank at an acute angle; a spoiler is arranged on the inner wall of the rotational flow activation tank; a throat pipe part is arranged in the middle of the differential pressure activator, and an air inlet channel is arranged between the throat pipe part and the outer end of the differential pressure activator. Emulsification and dispersion of a beneficiation reagent are promoted through the variable pressure principle, the ore surface is effectively cleaned, full mixing and collision between the reagent and particles are increased, the ore pulp activity is improved, conditions are provided for adhesion between subsequent particles and bubbles, the effect of activating ore pulp multiple times is achieved in cooperation with the rotational flow activation effect of the rotational flow activation tank, and the ore pulp activity is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of pulp activation devices, in particular to a pulp activation device which utilizes the pressure difference of a variable pressure to self-absorb gas and precipitate nano bubbles. Background Art

[0002] The slurry activation process is a prerequisite step for mineral flotation and plays a vital role in the mineral flotation process. The purpose of slurry activation is to change the surface properties of the mineral and enhance its ability to bind with the collector, thereby improving the floatability of the target mineral.

[0003] At present, the industry usually uses a stirring tank to directly activate the slurry. However, it is found in actual production that mechanical stirring can achieve stirring activation. Although it can meet the basic purpose of pollution-free mineralization, it has high energy consumption and low energy conversion rate. The slurry is not only easy to stratify in the stirring tank, but also prone to dead corners of slurry flow, resulting in uneven slurry activation, which in turn affects subsequent mineral flotation operations. Summary of the invention

[0004] In view of at least one of the above technical problems, the present invention provides a slurry activation device based on pressure-variable microbubble precipitation. By designing the flow channel of the slurry, the effect of pressurization and depressurization in the flow channel is achieved, so that gas is sucked in to precipitate nanobubbles, and the initial activation of the slurry is achieved. On this basis, an activation tank with a cyclone function is used to increase the full mixing and collision between the reagent and the particles, and significantly improve the activity of the slurry. The specific technical scheme is as follows: A slurry activation device based on pressure-variable microbubble precipitation comprises a slurry pump and a tubular pressure differential activator, wherein the slurry outlet channel of the slurry pump is connected to the inner end of the pressure differential activator, and the outer end of the pressure differential activator is connected to a swirl activation tank, the slurry inlet channel of the swirl activation tank is arranged at an acute angle on its outer surface, and a spoiler is arranged on the inner wall of the swirl activation tank; a throat portion is arranged in the middle of the pressure differential activator, and an air inlet channel is arranged between the throat portion and the outer end of the pressure differential activator.

[0005] In some embodiments of the present disclosure, a pressure gauge is provided in the liquid path connecting the slurry discharge channel of the slurry pump to the inner end of the pressure differential activator.

[0006] In some embodiments of the present disclosure, the slurry inlet and outlet passages of the pressure differential activator are respectively provided with flange valves.

[0007] In some embodiments of the present disclosure, the pressure differential activator is provided in plurality, and the parallel fluid circuits of the plurality of pressure differential activators are connected between the slurry outlet channel of the slurry pump and the slurry inlet channel of the cyclone activation tank.

[0008] In some embodiments of the present disclosure, the spoiler is a vertically arranged elongated spoiler.

[0009] In some embodiments of the present disclosure, there are multiple spoilers, and the multiple spoilers are evenly arranged on the inner wall of the swirl activation tank in a circumferential direction, and the spoilers and the inner wall of the swirl activation tank have an arc transition.

[0010] In some embodiments of the present disclosure, the ratio of the diameter of the air intake passage to the diameter of the throat portion is 0.5 to 2:10.

[0011] In some embodiments of the present disclosure, the throat portion is a circular channel with a diameter of 20 mm to 100 mm.

[0012] In some embodiments of the present disclosure, the cross-section of the cyclone activation tank body is a circular ring; in the top view of the cyclone activation tank body, the tangent angle between the slurry inlet channel and the outer wall of the cyclone activation tank is 5° to 60°.

[0013] In some embodiments of the present disclosure, the ratio of the throat portion to the diameter of the pressure difference activator tube body is 0.2 to 0.6.

[0014] Compared with the prior art, the above-mentioned slurry activation device based on pressure-variable microbubble precipitation has the following beneficial effects: The present invention promotes the emulsification and dispersion of the mineral processing agent through the principle of voltage change, effectively cleans the ore surface, increases the full mixing and collision between the agent and the particles, improves the activity of the slurry, provides conditions for the subsequent adhesion between the particles and the bubbles, and cooperates with the swirl activation effect of the swirl activation tank to achieve the effect of multiple activation of the slurry, significantly improving the activity of the slurry; In the present invention, the pressure of the slurry drops suddenly after passing through the throat, and the gas molecules in the liquid phase break through the energy barrier, preferentially gather and nucleate on the surface of the hydrophobic solid and continue to grow to form interfacial nanobubbles. The nanobubbles play a bridging role in the collision and adhesion process between fine-grained minerals and bubbles. The nanobubbles form flocs with the fine-grained minerals. The formed flocs increase the contact area with the bubbles, which increases the collision probability and adhesion probability. In addition, the presence of nanobubbles increases the hydrophobicity of the mineral surface, which is conducive to the adhesion of large bubbles to minerals; By utilizing the principles of natural fluid mechanics and setting the throat portion, negative pressure is formed between the throat portion and the outer end of the pressure difference activator, thereby achieving natural air suction at the air intake passage. The structure is intuitive and saves component costs compared to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the system structure of the present invention; Figure 2 It is a schematic diagram of a pressure difference activator in the structure of the present invention; Figure 3 It is a schematic diagram of the parallel pressure difference activator in the structure of the present invention; Explanation of the numbers in the figure: 1. slurry pump; 2. pressure difference activator; 21. throat; 22. air inlet channel; 3. swirl activation tank; 4. pressure gauge. DETAILED DESCRIPTION

[0016] In order to better understand the purpose, structure and function of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below. It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present application. The terms used herein in this application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The terms "including" and "provided with" in this application and any variations thereof are open-ended and are intended to cover non-exclusive inclusions.

[0017] The serial numbers assigned to the components herein are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" mentioned in this disclosure, unless otherwise specified, includes both direct and indirect "connections". In the description of this application, it should be understood that the directional terms "inside" and "outside" indicate directional relationships based on the attached Figure 2 The orientation relationship shown is only for the convenience of description, and does not indicate or imply that the device or unit referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation of the present application.

[0018] As shown in the attached figure Figures 1 to 3 As shown, a slurry activation device based on pressure-variable microbubble precipitation is designed, including a slurry pump 1 and a tubular pressure difference activator 2, the slurry outlet channel liquid path of the slurry pump 1 is connected to the inner end of the pressure difference activator 2, the outer end liquid path of the pressure difference activator 2 is connected to the cyclone activation tank 3, the slurry inlet channel of the cyclone activation tank 3 is arranged at an acute angle on its outer surface, and a spoiler is arranged on the inner wall of the cyclone activation tank 3; a throat portion 21 is provided in the middle of the pressure difference activator 2, and an air inlet channel 22 is provided between the throat portion 21 and the outer end of the pressure difference activator 2.

[0019] When in use, the ore pulp with added dressing agent is first fed into the pressure differential activator 2 by the slurry pump 1, and the pressure differential is formed by the throat part 21 inside the pressure differential activator 2, and the gas is self-absorbed through the air inlet channel 22 and nano bubbles are precipitated to complete the first activation; the ore pulp activated by the pressure differential activator 2 is tangentially fed into the cyclone activation tank 3 under the action of residual energy to complete the second activation; the ore pulp activated by the cyclone activation tank is discharged to the mineral flotation link under the action of gravity and enters the next operation. This technical solution provides conditions for the subsequent adhesion between particles and bubbles. It adopts the principle of variable pressure to promote the emulsification and dispersion of dressing agents, effectively clean the ore surface, increase the full mixing and collision between agents and particles, and can significantly improve the activity of the ore pulp. In the present technical solution, the pressure of the slurry drops suddenly after passing through the throat portion 21, and the gas molecules in the liquid phase break through the energy barrier, preferentially aggregate and nucleate on the surface of the hydrophobic solid and continue to grow to form interfacial nanobubbles. The nanobubbles play a bridging role in the collision and adhesion process between fine-grained minerals and bubbles. The nanobubbles form flocs with the fine-grained minerals. The formed flocs have an increased contact area with the bubbles, which increases the collision probability and adhesion probability.

[0020] In the above implementation mode, three embodiments are listed to implement the above technical solution. The reference to "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. In the absence of conflict, the various embodiments in the present application can be combined with each other.

[0021] like Figure 1 to Figure 2 As shown, the first embodiment discloses a slurry activation device based on pressure-variable microbubble precipitation, comprising a slurry pump 1 and a tubular pressure differential activator 2, wherein the slurry outlet channel of the slurry pump 1 is connected to the inner end of the pressure differential activator 2, and the outer end of the pressure differential activator 2 is connected to the cyclone activation tank 3, the slurry inlet channel of the cyclone activation tank 3 is arranged at an acute angle on its outer surface, and the cyclone activation tank 3 is a sealed tank body, and a spoiler is arranged on its inner wall; a throat portion 21 is arranged in the middle of the pressure differential activator 2, and the diameter of the throat portion 21 is smaller than the diameter of the tubular body of the pressure differential activator 2, and an air inlet channel 22 is arranged between the throat portion 21 and the outer end of the pressure differential activator 2; Among them, the slurry discharge channel of the slurry pump 1 is connected to the liquid path at the inner end of the pressure differential activator 2 and is equipped with a pressure gauge 4. Through the setting of the pressure gauge 4, the reading can be used to understand the size of the negative pressure in real time to judge the blockage of the flow channel inside the pipeline; the spoiler is a vertically arranged long spoiler, and the spoiler is provided with multiple spoilers, and the multiple spoilers are evenly arranged on the inner wall of the swirl activation tank 3 in a circumferential direction. The spoiler and the inner wall of the swirl activation tank 3 have an arc transition. In this embodiment, the number of spoilers can be 2, which are relatively arranged on both sides of the inner wall of the swirl activation tank 3. The slurry discharge port of the swirl activation tank 3 is arranged at the bottom of the swirl activation tank 3. This slurry discharge port is equipped with a valve, and the activated slurry is discharged from the slurry discharge port to the mineral flotation link under the action of gravity; the ratio of the diameter of the air inlet channel 22 to the diameter of the throat portion 21 is 0.5~2:10. In this embodiment, the ratio is 0.5:10. After passing through the throat portion 21, the pressure drops sharply, and the gas molecules in the liquid phase break through the energy barrier, preferentially gather and nucleate on the surface of the hydrophobic solid and continue to grow to form interface nanobubbles; in this embodiment, the throat portion 21 is a circular channel, and the diameter can be 20mm~100mm, and the preferred diameter in this embodiment is 20mm; the cross-section of the cyclone activation tank 3 is a circular ring; in the top view of the cyclone activation tank 3, the tangent angle between the slurry inlet channel and the outer wall of the cyclone activation tank 3 is 5°~60°, and in this embodiment, this angle is 5°. Through a smaller slurry injection angle, the slurry is injected into the cyclone activation tank 3 as much as possible. When the spoiler on the inner wall of the cyclone activation tank 3 collides and impacts, the quality of the second activation is improved; the ratio of the throat portion 21 to the diameter of the pressure difference activator 2 is 0.2~0.6, and in this embodiment, the ratio is 0.2.

[0022] like Figure 3 As shown, the second embodiment discloses a slurry activation device based on pressure-variable microbubble precipitation. The difference between this embodiment and the first embodiment is that the pressure differential activator 2 is provided with multiple, and in this embodiment, there can be four, and the four pressure differential activators 2 are connected in parallel between the slurry outlet channel of the slurry pump 1 and the slurry inlet channel of the cyclone activation tank 3. The slurry inlet and outlet paths of the pressure differential activator 2 are respectively provided with flange valves. When the reading of the pressure gauge 4 provided with a pressure differential activator 2 is abnormal, it can be determined that the flow channel is blocked. After closing the flange valve, the flange connection can be removed, and the pressure differential activator 2 can be maintained, repaired or replaced without affecting the normal operation of other flow paths, so as to achieve the purpose of non-stop maintenance and overhaul.

[0023] Among them, the ratio of the caliber of the air inlet channel 22 to the caliber of the throat portion 21 is 2:10; the diameter of the throat portion 21 is selected to be 50 mm; the tangent angle between the slurry inlet channel and the outer wall of the cyclone activation tank 3 is 30°. Through a smaller slurry injection angle, the slurry is injected into the cyclone activation tank 3. When the slurry is injected into the cyclone activation tank 3, it is possible to collide with the spoiler on the inner wall of the cyclone activation tank 3 to improve the quality of the second activation; the ratio of the caliber of the throat portion 21 to the tube body of the pressure difference activator 2 is 0.5.

[0024] To further optimize the design, the outer ends of the four pressure difference activators 2 are connected together through a multi-way joint and then connected to the pulp inlet channel of the cyclone activation tank 3.

[0025] Embodiment 3 discloses a slurry activation device based on pressure-variable microbubble precipitation. The difference between this embodiment and embodiment 2 is that, in this embodiment, the number of spoilers can be 4, which are evenly distributed on the inner wall of the cyclone activation tank 3; the ratio of the diameter of the air inlet channel 22 to the diameter of the throat portion 21 is 3:10; in this embodiment, the throat portion 21 is preferably 100 mm; the cross-section of the cyclone activation tank 3 is a circular ring; in the top view of the cyclone activation tank 3, the tangent angle between the slurry inlet channel and the outer wall of the cyclone activation tank 3 is 60°. Through a smaller slurry injection angle, the slurry is injected into the cyclone activation tank 3. When it collides and impacts with the spoiler on the inner wall of the cyclone activation tank 3, the quality of the second activation is improved; the ratio of the diameter of the throat portion 21 to the diameter of the pressure difference activator 2 is 0.6.

[0026] It can be understood that the above description is only for illustrating the specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the disclosure scope of the present application.

Claims

1. A slurry activation device based on pressure-variable microbubble precipitation, characterized in that: The invention comprises a slurry pump (1) and a tubular pressure differential activator (2); the slurry outlet channel of the slurry pump (1) is connected to the inner end of the pressure differential activator (2); the outer end of the pressure differential activator (2) is connected to a swirl activation tank (3); the slurry inlet channel of the swirl activation tank (3) is arranged at an acute angle on the outer surface thereof; the inner wall of the swirl activation tank (3) is provided with a flow spoiler; a throat portion (21) is provided in the middle of the pressure differential activator (2); an air inlet channel (22) is provided between the throat portion (21) and the outer end of the pressure differential activator (2).

2. The slurry activation device based on pressure-variable microbubble precipitation according to claim 1 is characterized in that: The liquid path connecting the slurry outlet channel of the slurry pump (1) to the inner end of the pressure difference activator (2) is provided with a pressure gauge (4).

3. The slurry activation device based on pressure-variable microbubble precipitation according to claim 1 or 2, characterized in that: The slurry inlet and outlet passages of the pressure differential activator (2) are respectively provided with flange valves.

4. The slurry activation device based on pressure-variable microbubble precipitation according to claim 1 is characterized in that: The pressure difference activator (2) is provided in plurality, and the plurality of pressure difference activators (2) are connected in parallel with a fluid path between a slurry outlet channel of a slurry pump (1) and a slurry inlet channel of a cyclone activation tank (3).

5. The slurry activation device based on pressure-variable microbubble precipitation according to claim 1 is characterized in that: The spoiler is a long spoiler plate arranged vertically.

6. The slurry activation device based on pressure-variable microbubble precipitation according to claim 5 is characterized in that: A plurality of spoilers are provided, and the plurality of spoilers are evenly arranged on the inner wall of the swirl activation tank (3) in the circumferential direction, and the spoilers and the inner wall of the swirl activation tank (3) are in arc transition.

7. The slurry activation device based on pressure-variable microbubble precipitation according to claim 1 is characterized in that: The ratio of the diameter of the air inlet passage (22) to the diameter of the throat portion (21) is 0.5 to 2:

10.

8. The slurry activation device based on pressure-variable microbubble precipitation according to claim 7, characterized in that: The throat portion (21) is a circular channel with a diameter of 20 mm to 100 mm.

9. The slurry activation device based on pressure-variable microbubble precipitation according to claim 1, characterized in that: The cross-section of the cyclone activation tank (3) is in the shape of a circular ring; in a top view of the cyclone activation tank (3), the tangent angle between the pulp inlet channel and the outer wall of the cyclone activation tank (3) is 5° to 60°.

10. The slurry activation device based on pressure-variable microbubble precipitation according to claim 1, characterized in that: The ratio of the throat portion (21) to the diameter of the pressure differential activator (2) is 0.2 to 0.6.

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