A device for eliminating foam in a reaction tank

Abstract

The utility model relates to a device that eliminates the foam of reaction tank, including the stirring shaft that sets up vertically in the center of reaction tank and the stirring blade that sets up on the stirring shaft, and the top transmission connection of stirring shaft has the top motor, its characterized in that: still including defoaming blade, defoaming blade left and right symmetry sets up in the top of stirring shaft and is located the above of stirring blade, defoaming blade includes connecting seat, connecting rod and defoaming toothed needle, connecting seat is fixedly connected with stirring shaft, connecting rod is fixed horizontally on connecting seat and extends along the horizontal direction, the upper surface and the lower surface of connecting rod all are spaced fixed with multiple groups of vertical defoaming toothed needle along its length direction, form bidirectional puncture structure, make the foam that fluctuates up and down with stirring wave when contacting defoaming toothed needle from the above or the below all can be punctured quickly, have greater effective defoaming range, can significantly reduce the thickness and duration of foam accumulation in liquid surface, avoid the formation of foam heat insulating layer.

Description

Technical Field

[0001] This utility model relates to the field of hydrometallurgical technology, specifically to a device for eliminating foam in a reaction tank. Background Technology

[0002] In the hydrometallurgical process of non-ferrous metals such as copper, lead, and zinc, the raw materials are often crushed and ground into a slurry of a certain particle size. Leaching agents such as sulfuric acid are added in proportion, and a solid-liquid mixing reaction is carried out in a stirred reaction tank to transfer metals such as copper, lead, and zinc into the solution. The target metal is then recovered through purification, electrowinning, or displacement processes.

[0003] To improve solid-liquid contact efficiency and promote reaction, some leaching processes employ well-shaped reaction tanks, equipped with a centrally located stirring shaft and blades. Feed is typically added from the top or side of the stirring well, and the reacted slurry is discharged continuously or intermittently from the outer ring outlet after remaining in the outer ring area.

[0004] However, during the acid leaching of copper, lead, and zinc materials, the reaction between minerals and acid is often accompanied by gas release (e.g., the reaction of carbonate minerals with acid produces carbon dioxide), and the introduction of air through agitation easily leads to the formation of a large amount of foam on the surface of the reaction liquid. This foam covering the liquid surface significantly hinders heat exchange between the reaction liquid and the air above, reducing natural heat dissipation efficiency. This is especially problematic for reaction tanks that rely on open tops for natural cooling, making it difficult to control the reaction temperature and potentially causing localized overheating. This can negatively impact leaching kinetics, solution equilibrium, and the stability of subsequent metal recovery processes.

[0005] Therefore, it is necessary to study a device for eliminating foam in the reaction tank. Utility Model Content

[0006] Therefore, the purpose of this utility model is to provide a device for eliminating foam in a reaction tank, which can effectively solve the problem that foam easily forms on the liquid surface in existing reaction tanks, thus affecting heat dissipation.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A device for eliminating foam in a reaction tank includes a stirring shaft vertically arranged in the center of the reaction tank and stirring blades arranged on the stirring shaft, with a top motor connected to the top of the stirring shaft; it also includes defoaming blades. The defoaming blades are symmetrically arranged on the top of the stirring shaft and above the stirring blades. The defoaming blade includes a connecting seat, a connecting rod, and defoaming needles; The connecting seat is fixedly connected to the stirring shaft; The connecting rod is horizontally fixed on the connecting seat and extends in the horizontal direction. Multiple sets of vertical defoaming needles are fixed at intervals along the length of the upper and lower surfaces of the connecting rod, forming a bidirectional puncture structure.

[0008] Furthermore, the connecting seat includes a clamping part and a flange plate; the clamping part is adapted to fit and fit against the side wall of the stirring shaft, and flange plates are vertically fixed on both the front and rear sides of the clamping part; Fasteners are connected to the flanges of the two sets of defoaming blades to secure the two clamps to the side wall of the stirring shaft.

[0009] Furthermore, a reinforcing rib is fixedly connected between the connecting seat and the connecting rod, and multiple reinforcing ribs are arranged at intervals around the connecting rod.

[0010] Furthermore, it also includes an annular defoaming chamber; the defoaming chamber is fixed on the inner wall of the reaction tank and arranged around the defoaming blades; The defoaming chamber includes a base plate, an impact ring plate, and a top plate; The bottom plate is fixedly connected to the reaction tank, and a filter screen is provided on the bottom plate to allow the reaction liquid to pass through but to block foam. The impact ring plate is fixed on the base plate, and a defoaming gap is maintained between the movement trajectory of the impact ring plate and the defoaming blades, so that the agitated foam is broken by impacting the impact ring plate. The top plate is set on the impact ring plate to enclose the top of the defoaming chamber.

[0011] Furthermore, the impact ring plate has several through defoaming holes, which are tapered holes that gradually decrease in size towards the inside of the defoaming chamber. The maximum diameter of the tapered hole allows foam to enter, but the minimum diameter of the tapered hole intercepts the foam.

[0012] Furthermore, the base plate is inclined upwards in the direction toward the stirring shaft.

[0013] The beneficial effects of the above technical solution are: This invention adds symmetrical defoaming blades to the top of the stirring shaft and above the stirring blades, enabling simultaneous physical breaking of surface foam in the reaction liquid during material stirring. The connecting rods of the defoaming blades extend radially along the stirring shaft, and multiple sets of spaced defoaming needles are vertically arranged at both the top and bottom, forming a bidirectional piercing structure. This ensures that foam, fluctuating with the stirring, is quickly pierced by the defoaming needles regardless of whether it comes into contact with them from above or below, providing a large effective defoaming range. This significantly reduces the thickness and duration of foam accumulation on the liquid surface, preventing the formation of a foam insulation layer and ensuring efficient heat exchange between the material in the reaction tank and the external environment. Furthermore, it does not rely on chemical defoamers, avoiding adverse effects on the composition of leaching solutions containing non-ferrous metals such as copper, lead, and zinc. The structure is simple and easy to manufacture, making it suitable for widespread application in various open, well-type, or other reaction tanks requiring top heat dissipation. Attached Figure Description

[0014] Figure 1 This is a cross-sectional schematic diagram of the present invention when applied to a reaction vessel; Figure 2 A three-dimensional assembly diagram of the stirring shaft, stirring blades, and defoaming blades; Figure 3 A three-dimensional schematic diagram of a single defoaming blade; Figure 4 This is a cross-sectional view of the defoaming chamber.

[0015] Reference numerals: 1. Reaction tank; 2. Stirring shaft; 3. Stirring blades; 4. Top-mounted motor; 5. Defoaming blades; 6. Defoaming chamber; 7. Motor frame; 8. Support frame; 101. Conveying pipe; 102. Discharge port; 501. Connecting seat; 502. Connecting rod; 503. Defoaming toothed needle; 504. Clamping part; 505. Flange plate; 506. Fastener; 507. Reinforcing rib; 601. Base plate; 602. Impact ring plate; 603. Top plate; 604. Filter screen; 605. Defoaming hole. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: This embodiment aims to provide a device for eliminating foam in reaction tanks, which is mainly used in the acid leaching process of copper, lead and zinc materials, addressing the problem that foam easily forms on the liquid surface in existing reaction tanks, thus affecting heat dissipation.

[0017] A device for eliminating foam in a reaction tank, such as Figure 1The reaction tank 1 includes a stirring shaft 2 vertically positioned at the center and stirring blades 3 mounted on the stirring shaft 2. Three sets of stirring blades 3 are spaced vertically along the stirring shaft 2. The reaction tank 1 has a cylindrical structure with an open top. A support frame 8 is fixed to the top, and a motor frame 7 is fixedly connected to the middle of the support frame 8. A top-mounted motor 4 is mounted on the motor frame 7. The stirring shaft 2 is rotatably mounted to the support frame 8, and the top of the stirring shaft 2 is connected to the top-mounted motor 4. A conveying pipe 101 is provided inside the reaction tank 1, and a discharge port 102 is provided at the bottom of the reaction tank 1. The basic structure of the reaction tank 1 with the central stirring shaft 2 adopts existing technology, including but not limited to the above-mentioned content, and will not be repeated here. The improvement in this embodiment is that it also includes defoaming blades 5.

[0018] The defoaming blades 5 are symmetrically arranged on the top of the stirring shaft 2 and above the stirring blades 3. In actual use, the defoaming blades 5 should be placed on the foam layer at the top of the reaction liquid, or the liquid level of the reaction liquid should be controlled to achieve the same effect.

[0019] like Figure 2 and Figure 3 The defoaming blade 5 includes a connecting seat 501, a connecting rod 502, and a defoaming tooth 503. The connecting seat 501 is fixedly connected to the stirring shaft 2. Specifically, the connecting seat 501 includes a clamping part 504 and a flange plate 505. The clamping part 504 is adapted to fit against the side wall of the stirring shaft 2. The front and rear sides of the clamping part 504 are vertically fixed with flange plates 505, and multiple bolt holes are correspondingly opened on the flange plates 505. Fasteners 506 are correspondingly connected to the flange plates 505 of the two sets of defoaming blades 5 to encircle and fix the two opposing clamping parts 504 to the side wall of the stirring shaft 2. The fasteners 506 are bolt kits.

[0020] The connecting rod 502 is horizontally welded and fixed to the connecting seat 501. A reinforcing rib 507 is fixedly connected between the connecting seat 501 and the connecting rod 502. Four reinforcing ribs 507 are arranged around the connecting rod 502 at intervals to strengthen the connection between the connecting rod 502 and the connecting seat 501.

[0021] The connecting rod 502 is horizontally welded and fixed to the connecting seat 501 and extends horizontally. Multiple sets of vertical defoaming needles 503 are fixed at intervals along the length of both the upper and lower surfaces of the connecting rod 502, forming a bidirectional piercing structure with a large effective longitudinal defoaming range. This effectively addresses the problem of foam rising and falling with the agitation of the reaction liquid, ensuring that foam is quickly pierced regardless of whether it comes into contact with the defoaming needles 503 from above or below. Furthermore, the multiple sets of defoaming needles 503 arranged along the length of the connecting rod 502 can cover a large area of ​​the liquid surface, effectively improving defoaming efficiency. In practical use, the defoaming needles 503 at the bottom can be submerged below the surface of the still reaction liquid to cope with the fluctuations in the liquid surface during agitation.

[0022] like Figure 1 and Figure 4 It also includes an annular defoaming chamber 6; the defoaming chamber 6 is fixed on the inner wall of the reaction tank 1 and is arranged around the defoaming blades 5. The defoaming chamber 6 includes a bottom plate 601, an impact ring plate 602 and a top plate 603; the bottom plate 601 is fixedly connected to the reaction tank 1, and the bottom plate 601 is inclined upward in the direction towards the stirring shaft 2. The bottom plate 601 is completely or partially submerged in the reaction liquid. A filter screen 604 is provided on the bottom plate 601 to allow the reaction liquid to pass through but to block foam, so that the defoaming chamber 6 is kept in communication with the reaction tank 1.

[0023] The impact ring plate 602 is fixed to the base plate 601. A defoaming gap is maintained between the impact ring plate 602 and the movement trajectory of the defoaming blades 5. The defoaming gap is selected to be between 10-20cm to prevent the defoaming blades 5 from contacting it, so that the foam agitated by the defoaming blades 5 and the stirring blades 3 can impact and break on the impact ring plate 602, thereby improving the defoaming effect. The top plate 603 is set on the impact ring plate 602 to seal the top of the defoaming chamber 6.

[0024] Furthermore, the impact ring plate 602 has several through defoaming holes 605. The defoaming holes 605 are tapered holes that gradually decrease in size towards the inside of the defoaming chamber 6. The maximum diameter of the tapered hole allows foam to enter, but the minimum diameter of the tapered hole intercepts the foam. When the foam is agitated and moves towards the impact ring plate 602, the foam will enter from the large hole of the defoaming hole 605 and will gradually be squeezed out in the defoaming hole 605. The foam liquid generated by the squeezed-out foam will enter the defoaming chamber 6 and can flow back into the reaction tank 1.

Claims

1. A device for eliminating foam in a reaction tank, comprising a stirring shaft vertically arranged at the center of the reaction tank and stirring blades arranged on the stirring shaft, wherein a top-mounted motor is drivenly connected to the top of the stirring shaft; characterized in that: It also includes defoaming blades; The defoaming blades are symmetrically arranged on the top of the stirring shaft and above the stirring blades. The defoaming blade includes a connecting seat, a connecting rod, and defoaming needles; The connecting seat is fixedly connected to the stirring shaft; The connecting rod is horizontally fixed on the connecting seat and extends in the horizontal direction. Multiple sets of vertical defoaming needles are fixed at intervals along the length of the upper and lower surfaces of the connecting rod, forming a bidirectional puncture structure.

2. The apparatus for eliminating foam in a reaction tank according to claim 1, characterized in that: The connecting seat includes a clamp and a flange plate; the clamp is adapted to fit against the side wall of the stirring shaft, and flange plates are vertically fixed on both the front and rear sides of the clamp; Fasteners are connected to the flanges of the two sets of defoaming blades to secure the two clamps to the side wall of the stirring shaft.

3. The apparatus for eliminating foam in a reaction tank according to claim 1, characterized in that: A reinforcing rib is fixedly connected between the connecting seat and the connecting rod, and multiple reinforcing ribs are arranged at intervals around the connecting rod.

4. An apparatus for eliminating foam in a reaction tank according to any one of claims 1-3, characterized in that: It also includes an annular defoaming chamber; the defoaming chamber is fixed on the inner wall of the reaction tank and arranged around the defoaming blades; The defoaming chamber includes a base plate, an impact ring plate, and a top plate; The bottom plate is fixedly connected to the reaction tank, and a filter screen is provided on the bottom plate to allow the reaction liquid to pass through but to block foam. The impact ring plate is fixed on the base plate, and a defoaming gap is maintained between the movement trajectory of the impact ring plate and the defoaming blades, so that the agitated foam is broken by impacting the impact ring plate. The top plate is set on the impact ring plate to enclose the top of the defoaming chamber.

5. The apparatus for eliminating foam in a reaction tank according to claim 4, characterized in that: The impact ring plate has several through defoaming holes. The defoaming holes are tapered holes that gradually decrease in size towards the inside of the defoaming chamber. The maximum diameter of the tapered hole allows foam to enter, but the minimum diameter of the tapered hole intercepts the foam.

6. The apparatus for eliminating foam in a reaction tank according to claim 5, characterized in that: The base plate is inclined upwards in the direction toward the stirring shaft.

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