Defoaming device and method of tailing thickener

Abstract

The invention relates to the field of mining equipment, in particular to a defoaming device and method for a tailing thickener, and the defoaming device comprises a movable frame arranged above the thickener, and the movable frame is driven by a driving device and vertically reciprocates; a mounting shaft which is driven by a power device and rotates around the axis of the mounting shaft is arranged on the movable frame, an annular main pipeline is fixedly mounted at the lower end of the mounting shaft, a plurality of water outlet branch pipes which are uniformly arranged at intervals in the circumferential direction are arranged on the inner side of the annular main pipeline, and the ends, away from the annular main pipeline, of the water outlet branch pipes incline downwards; nozzles are fixedly mounted at the ends, away from the annular main pipeline, of the water outlet branch pipes; in the process that the spray head sprays an agent into the thickener, the movable frame is driven by the driving device to vertically reciprocate, so that the area where the spray head sprays the agent reciprocates inside and outside along the radius of the thickener, the agent sprayed by the spray head can cover a larger area in the thickener, and the defoaming efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of mining equipment, and in particular to a defoaming device and method for a tailings thickener. Background Art

[0002] A thickener is a continuously working thickening and clarifying equipment, mainly used for dehydrating concentrate and tailings slurry in wet mineral processing operations. It uses the gravity sedimentation of particles as its working principle to achieve material separation. During the use of the thickener, a large amount of foam will appear on the liquid surface. Since solid particles will adhere to the bubbles, the sedimentation rate of the particles will slow down, greatly reducing the efficiency of the thickener. Therefore, a defoaming device needs to be installed on the top of the thickener to remove the bubbles.

[0003] Existing defoaming devices, such as the invention patent with application number 202021587354.8, discloses a thickener defoaming device, including a defoaming pipe, which is annular and provided with a plurality of nozzles distributed circumferentially along the defoaming pipe. Defoaming water is transported to each nozzle through the defoaming pipe, and any nozzle sprays defoaming water toward the center of the thickener to eliminate foam.

[0004] In the above defoaming device, since the position of the nozzle is fixed, the range of the nozzle spraying defoaming water is limited, so that high-efficiency defoaming work cannot be achieved, which needs to be improved. Summary of the invention

[0005] The object of the present invention is to provide a defoaming device and method for a tailings thickener, wherein the nozzle sprays the agent during the rotation process, so as to solve the defects mentioned in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A defoaming device for a tailings thickener comprises a movable frame arranged above the thickener, the movable frame is driven by a driving device and moves back and forth vertically; the movable frame is provided with a mounting shaft driven by a power device and rotates around its own axis, the mounting shaft is coaxially arranged with the thickener, an annular main pipeline coaxially arranged with the thickener is fixedly installed at the lower end of the mounting shaft, a liquid inlet is provided on the annular main pipeline, the liquid inlet is connected to a liquid supply mechanism for supplying reagents, a plurality of water outlet branches are provided on the inner side of the annular main pipeline evenly spaced in the circumferential direction, the end of the water outlet branch away from the annular main pipeline is inclined downward, and a nozzle is fixedly installed at the end of the water outlet branch away from the annular main pipeline.

[0008] As a preferred technical solution, an angle of 15° is provided between the axis of the water outlet branch pipe and the horizontal plane.

[0009] As a preferred technical solution, the projection of the water outlet branch pipe on the horizontal plane does not coincide with the diameter of the annular main pipe.

[0010] As a preferred technical solution, an angle of 15° to 75° is formed between the axis of the water outlet branch pipe and the diameter of the annular main pipe in a horizontal plane.

[0011] As a preferred technical solution, the movable frame includes a horizontal plate, and vertically extending outer tubes are fixedly installed at the bottom of both ends of the horizontal plate; inner tubes corresponding to the outer tubes are fixedly installed on the outer wall of the thickener, and the outer tubes are vertically slidably sleeved on the outer sides of the corresponding inner tubes; the driving device includes an eccentric wheel installed on the inner tube and driven to rotate by a driving motor, the axis of rotation of the eccentric wheel extends horizontally, and a support wheel matching the eccentric wheel is rotatably installed on the outer tube, and the eccentric wheel is supported at the bottom of the support wheel.

[0012] As a preferred technical solution, a bottom plate is fixedly installed on the lower end of the inner tube, and the bottom plate is fixedly installed on the thickener. A sliding rod located on the side of the inner tube is fixedly installed on the top of the bottom plate, and the sliding rod extends vertically. A horizontal plate is fixedly installed on the side of the lower end of the outer tube, and the horizontal plate is slidably installed on the sliding rod. A stopper is fixedly installed on the upper end of the sliding rod, and a spring is connected between the stopper and the horizontal plate.

[0013] As a preferred technical solution, a liquid supply pipe is fixedly installed on the top of the movable frame, one end of the liquid supply pipe is connected to the liquid supply mechanism, the other end of the liquid supply pipe is fixedly connected to the liquid inlet end of the rotating joint, the liquid outlet end of the rotating joint is coaxially arranged with the installation shaft, the liquid outlet end of the rotating joint is rotatably connected to one end of the liquid supply hose, a vertically penetrating pipe passage is provided in the installation shaft, and one end of the liquid supply hose away from the rotating joint passes downward through the pipe passage and is connected to the liquid inlet.

[0014] A defoaming method using a defoaming device of a tailings thickener, the method comprising the following steps:

[0015] supplying the agent to the annular main pipeline through the liquid supply mechanism, and spraying the agent into the thickener through the nozzle;

[0016] While the nozzle sprays the agent, the driving device drives the movable frame and the annular main pipeline to move back and forth vertically, thereby causing the area where the nozzle sprays the agent to move back and forth inside and outside the radius of the thickener;

[0017] While the nozzle sprays the medicine, the power device drives the installation shaft to rotate, thereby causing the nozzle to rotate around the circumference of the thickener to spray the medicine, thereby increasing the range of the nozzle spraying the medicine.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the process of the nozzle spraying the agent into the thickener, the movable frame is driven to move back and forth vertically by the driving device, and then the movable frame drives the annular main pipeline and the nozzle to move back and forth vertically. When the annular main pipeline and the nozzle rise, the area where the nozzle sprays the agent moves toward the direction close to the center of the thickener; when the annular main pipeline and the nozzle descend, the area where the nozzle sprays the agent moves away from the center of the thickener. In the process of the movable frame driving the annular main pipeline and the nozzle to move back and forth vertically, the area where the nozzle sprays the agent moves back and forth along the radius of the thickener, so that the agent sprayed by the nozzle can cover a larger area in the thickener, thereby improving the defoaming efficiency;

[0020] 2. When the nozzle sprays the agent into the thickener, the power device drives the installation shaft to rotate around its own axis, and the installation shaft drives the annular main pipeline to rotate around its own axis through the fixed frame, so that the annular main pipeline drives multiple nozzles to spray the agent into the thickener during the rotation process, which can further increase the range of the nozzle spraying agent and improve the defoaming efficiency;

[0021] 3. The projection of the outlet branch pipe on the horizontal plane does not coincide with the diameter of the annular main pipe. Therefore, when the nozzle sprays the agent into the thickener, the agent impacts the foam to form a vortex in the thickener, accelerating the aggregation, rupture and dissipation of the foam and improving the defoaming efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0024] Figure 2 is a schematic structural diagram of an installation shaft according to an embodiment of the present invention;

[0025] Figure 3 is a schematic structural diagram of a water outlet branch pipe according to an embodiment of the present invention;

[0026] Figure 4 Schematic diagram of the structure of the inner tube of an embodiment of the present invention.

[0027] In the figure: 1-thickener; 2-movable frame; 3-cross plate; 4-outer tube; 5-support plate; 6-inner tube; 7-bottom plate; 8-drive motor; 9-eccentric wheel; 10-support wheel; 11-installation shaft; 12-power motor; 13-active bevel gear; 14-passive bevel gear; 15-annular main pipeline; 16-liquid inlet; 17-liquid supply pipe; 18-rotating joint; 19-liquid supply hose; 20-pipe passage; 21-water outlet branch pipe; 22-sprinkler; 23-injection port; 24-slide rod; 25-horizontal plate; 26-block; 27-spring; 28-fixed frame; 29-U-shaped seat. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figures 1 to 4 As shown, a defoaming device of a tailings thickener comprises a movable frame 2 arranged above the thickener 1, and the movable frame 2 is driven by a driving device and moves back and forth vertically. Specifically, the movable frame 2 includes a transverse plate 3, and the bottoms of both ends of the transverse plate 3 are respectively fixed with vertically extending outer tubes 4 by bolts; the thickener 1 is circular, and support plates 5 are respectively welded on the opposite sides of the outer wall of the thickener 1, and vertically extending inner tubes 6 are respectively provided above the two support plates 5, and the lower ends of the inner tubes 6 are welded with bottom plates 7, and the bottom plates 7 are fixedly installed on the corresponding support plates 5 by bolts, and the outer tube 4 is vertically slidably sleeved on the outer sides of the corresponding inner tubes 6, so as to support and guide the vertical movement of the movable frame 2; the driving device includes a driving motor 8 installed on the outer side of the inner tube 6 by bolts, and the side wall of the outer tube 4 is provided with an avoidance groove at the position corresponding to the driving motor 8, and the rotating shaft of the driving motor 8 extends transversely to the upper end of the inner tube 6 and is fixedly installed with an eccentric wheel 9, and a transverse axis is rotatably installed in the outer tube 4 above the eccentric wheel 9 through a bearing, and the transverse axis is parallel to the rotating shaft of the driving motor 8, such as Figure 4 As shown, a support wheel 10 matching the eccentric wheel 9 is coaxially fixedly mounted on the transverse axis, and the eccentric wheel 9 is supported at the bottom of the support wheel 10. When the drive motor 8 is running, the eccentric wheel 9 is driven to rotate, and the eccentric wheel 9 acts on the support wheel 10 to drive the movable frame 2 to move up and down as a whole.

[0030] like Figure 1As shown, the movable frame 2 is provided with a mounting shaft 11 driven by the power device and rotating around its own axis. The mounting shaft 11 is coaxially arranged with the thickener 1, and the mounting shaft 11 is rotatably mounted on the horizontal plate 3 through a bearing; the power device specifically includes a power motor 12 mounted on the top of the horizontal plate 3 by bolts, a driving bevel gear 13 is fixedly mounted on the rotating shaft of the power motor 12, and a passive bevel gear 14 meshing with the driving bevel gear 13 is fixedly mounted on the outer side of the upper end of the mounting shaft 11. When the power motor 12 is running, it drives the driving bevel gear 13 to rotate, and the driving bevel gear 13 acts on the driven bevel gear and drives the mounting shaft 11 to rotate around its own axis.

[0031] The lower end of the installation shaft 11 is fixedly mounted with an annular main pipeline 15 coaxially arranged with the thickener 1. Specifically, Figure 2 As shown, a fixing frame 28 is fixedly installed at the lower end of the mounting shaft 11 by bolts. The fixing frame 28 is provided with a horizontal arm and vertical arms extending downwardly and integrally formed at both ends of the horizontal arm. The annular main pipeline 15 is fixedly connected to the two vertical arms of the fixing frame 28 by U-shaped seats 29 respectively.

[0032] The annular main pipeline 15 is provided with a liquid inlet 16, which is connected to a liquid supply mechanism for supplying medicine. Specifically, a liquid supply pipe 17 extending laterally is fixedly installed on the top of the horizontal plate 3 through a stand, one end of the liquid supply pipe 17 is connected to the liquid supply mechanism, and the other end of the liquid supply pipe 17 is fixedly connected to the liquid inlet end of a rotating joint 18. The rotating joint 18 is L-shaped, and the liquid outlet end of the rotating joint 18 is coaxially arranged with the installation shaft 11. The liquid outlet end of the rotating joint 18 is rotatably connected to one end of a liquid supply hose 19. A vertically penetrating pipe passage 20 is provided in the installation shaft 11, and one end of the liquid supply hose 19 away from the rotating joint 18 passes downward through the pipe passage 20 and the fixed frame 28 and is connected to the liquid inlet 16. By providing the rotating joint 18, the annular main pipeline 15 can be supplied with liquid medicine while ensuring that the annular main pipeline 15 rotates smoothly following the installation shaft 11.

[0033] The inner side of the annular main pipeline 15 is provided with a plurality of water outlet branch pipes 21 arranged at even intervals in the circumferential direction. Figure 3 As shown, the end of the water outlet branch pipe 21 away from the annular main pipe 15 is tilted downward, and a nozzle 22 is fixedly installed at the end of the water outlet branch pipe 21 away from the annular main pipe 15, and the spraying direction of the nozzle 22 extends along the water outlet branch pipe 21. In this embodiment, a flat spray port 23 is provided at the liquid outlet end of the nozzle 22, and the spray port 23 sprays fan-shaped water mist, thereby increasing the range of the nozzle 22 spraying the agent.

[0034] In this embodiment, an angle of 15° is set between the axis of the water outlet branch pipe 21 and the horizontal plane. In the process of the nozzle 22 spraying the agent into the thickener 1, the movable frame 2 is driven by the driving device to move back and forth vertically, and then the movable frame 2 drives the annular main pipe 15 and the nozzle 22 to move back and forth vertically; because the end of the water outlet branch pipe 21 away from the annular main pipe 15 is tilted downward, when the annular main pipe 15 and the nozzle 22 rise, the area where the nozzle 22 sprays the agent moves toward the direction close to the center of the thickener 1; when the annular main pipe 15 and the nozzle 22 fall, the area where the nozzle 22 sprays the agent moves away from the center of the thickener 1, so that in the process of the movable frame 2 driving the annular main pipe and the nozzle 22 to move back and forth vertically, the area where the nozzle 22 sprays the agent moves back and forth along the radius of the thickener 1, so that the agent sprayed by the nozzle 22 can cover a larger area in the thickener 1, thereby improving the defoaming efficiency. At the same time, the installation shaft 11 is driven by the power device to rotate around its own axis, and the installation shaft 11 drives the annular main pipeline 15 to rotate around its own axis through the fixed frame 28, so that the annular main pipeline 15 drives multiple nozzles 22 to spray the agent into the thickener 1 during the rotation process, which can further increase the range of the nozzle 22 spraying the agent and improve the defoaming efficiency.

[0035] In this embodiment, the projection of the water outlet branch pipe 21 on the horizontal plane does not coincide with the diameter of the annular main pipe 15. Specifically, the axis of the water outlet branch pipe 21 and the diameter of the annular main pipe 15 are provided with an angle of 15° to 75° in the horizontal plane, so that when the nozzle 22 sprays the agent into the thickener 1, the agent impacts the foam to form a vortex in the thickener 1, which accelerates the aggregation, rupture and dissipation of the foam and improves the defoaming efficiency.

[0036] In this embodiment, if Figure 4 As shown, two slide bars 24 arranged opposite to each other on the left and right sides are fixedly installed on the top of the bottom plate 7 located on the front and rear sides of the inner tube 6, and the slide bars 24 extend vertically. The lower ends of the slide bars 24 are connected to the bottom plate 7 by threads. Horizontal plates 25 are welded to the front and rear sides of the lower end of the outer tube 4, and the horizontal plates 25 are vertically slidably installed on the two slide bars 24 on the corresponding side. A stopper 26 is welded to the upper end of the slide bar 24, and a spring 27 is connected between the stopper 26 and the horizontal plate 25. The spring 27 is sleeved on the slide bar 24 between the corresponding stopper 26 and the horizontal plate 25. By setting the spring 27, the spring 27 gives the outer tube 4 a downward thrust, so that the outer tube 4 drives the support wheel 10 downward to be close to the top of the eccentric wheel 9, thereby improving the efficiency of the eccentric wheel 9 driving the movable frame 2 to move up and down.

[0037] A defoaming method using the defoaming device of the above-mentioned tailings thickener, the method comprising the following steps: supplying reagents to the annular main pipeline 15 through a liquid supply mechanism, and spraying the reagents into the thickener 1 through a nozzle 22; while the nozzle 22 sprays the reagents, the movable frame 2 and the annular main pipeline 15 are driven to reciprocate vertically by a driving device, so that the area where the nozzle 22 sprays the reagents reciprocates inside and outside the radius of the thickener 1; while the nozzle 22 sprays the reagents, the installation shaft 11 is driven to rotate by a power device, so that the nozzle 22 rotates around the circumference of the thickener 1 to spray the reagents, thereby increasing the range of the nozzle spraying the reagents.

[0038] In this embodiment, the types of agents used are precipitants and defoamers, and the types of defoamers and precipitants include but are not limited to: fatty acid salts, silicone oils and polyether defoamers; the ratio of the agents is, defoamer: precipitant = 1:1 (200ppm: 200ppm); the total flow rate Q of the nozzle 22 is 80-100m 3 / h, the flow rate of a single nozzle is not less than 10m 3 / h.

[0039] Within half an hour of spraying the agent into the thickener through the nozzle 22, the accumulated foam in the thickener forms a vortex under the impact of the nozzle 22, and the overflow water becomes turbid in large quantities. 2-3 hours after the agent is added, the foam layer at the edge of the thickener presents a thin layer of emulsification, the large foam in the middle is gradually dissolved, and the overflow water of the thickener becomes clear. According to the measurement, the maximum solid content of the thickener overflow water before the addition of the agent is 1.52% on average, and the solid content after 120 minutes drops to less than 0.2%, and the solid content is significantly reduced. The average turbidity before the addition of the agent is 681NTU, and the turbidity 30 minutes after the addition of the agent is 839NTU, and the turbidity of the overflow water increases. The average turbidity 120 minutes after the addition of the agent is only 203NTU, and the turbidity is significantly improved compared with before the addition of the agent.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A defoaming device for a tailings thickener, characterized in that: The invention comprises a movable frame (2) arranged above a thickener (1), the movable frame (2) being driven by a driving device and being vertically reciprocating; a mounting shaft (11) being driven by a power device and rotating around its own axis is arranged on the movable frame (2), the mounting shaft (11) being coaxially arranged with the thickener (1), an annular main pipe (15) being coaxially arranged with the thickener (1) being fixedly mounted on the lower end of the mounting shaft (11), the annular main pipe (15) being provided with a liquid inlet (16), the liquid inlet (16) being connected to a liquid supply mechanism for supplying a medicine, a plurality of water outlet branch pipes (21) being arranged at even intervals in the circumferential direction on the inner side of the annular main pipe (15), the end of the water outlet branch pipe (21) being away from the annular main pipe (15) being tilted downward, and a nozzle (22) being fixedly mounted on the end of the water outlet branch pipe (21) being away from the annular main pipe (15).

2. A defoaming device for a tailings thickener as claimed in claim 1, characterized in that: An angle of 15° is provided between the axis of the water outlet branch pipe (21) and the horizontal plane.

3. A defoaming device for a tailings thickener as claimed in claim 1, characterized in that: The projection of the water outlet branch pipe (21) on the horizontal plane does not coincide with the diameter of the annular main pipe (15).

4. A defoaming device for a tailings thickener as claimed in claim 3, characterized in that: An included angle of 15° to 75° is formed between the axis of the water outlet branch pipe (21) and the diameter of the annular main pipe (15) in a horizontal plane.

5. A defoaming device for a tailings thickener as claimed in claim 1, characterized in that: The movable frame (2) comprises a transverse plate (3), and vertically extending outer tubes (4) are fixedly mounted at the bottoms of both ends of the transverse plate (3); inner tubes (6) corresponding to the outer tubes (4) are fixedly mounted on the outer wall of the thickener (1), and the outer tubes (4) are vertically slidably sleeved on the outer sides of the corresponding inner tubes (6); the driving device comprises an eccentric wheel (9) mounted on the inner tube (6) and driven to rotate by a driving motor (8), and the axis of rotation of the eccentric wheel (9) extends horizontally, and a supporting wheel (10) matching the eccentric wheel (9) is rotatably mounted on the outer tube (4), and the eccentric wheel (9) is supported at the bottom of the supporting wheel (10).

6. A defoaming device for a tailings thickener as claimed in claim 5, characterized in that: A bottom plate (7) is fixedly mounted on the lower end of the inner tube (6), and the bottom plate (7) is fixedly mounted on the thickener (1). A sliding bar (24) located on the side of the inner tube (6) is fixedly mounted on the top of the bottom plate (7), and the sliding bar (24) extends vertically. A horizontal plate (25) is fixedly mounted on the side of the lower end of the outer tube (4), and the horizontal plate (25) is slidably mounted on the sliding bar (24). A stopper (26) is fixedly mounted on the upper end of the sliding bar (24), and a spring (27) is connected between the stopper (26) and the horizontal plate (25).

7. A defoaming device for a tailings thickener as claimed in claim 1, characterized in that: A liquid supply pipe (17) is fixedly installed on the top of the movable frame (2), one end of the liquid supply pipe (17) is connected to the liquid supply mechanism, the other end of the liquid supply pipe (17) is fixedly connected to the liquid inlet end of the rotating joint (18), the liquid outlet end of the rotating joint (18) is coaxially arranged with the installation shaft (11), the liquid outlet end of the rotating joint (18) is rotatably connected to one end of a liquid supply hose (19), a vertically penetrating pipe passage (20) is provided in the installation shaft (11), and one end of the liquid supply hose (19) away from the rotating joint (18) passes downward through the pipe passage (20) and is connected to the liquid inlet (16).

8. A defoaming method using the defoaming device of the tailings thickener according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: The liquid supply mechanism supplies the reagent to the annular main pipeline (15), and the spray head (22) sprays the reagent into the thickener (1); While the nozzle (22) sprays the agent, the driving device drives the movable frame (2) and the annular main pipeline (15) to move back and forth vertically, thereby causing the area where the nozzle (22) sprays the agent to move back and forth inside and outside the radius of the thickener (1); While the spray head (22) is spraying the medicine, the power device drives the mounting shaft (11) to rotate, thereby causing the spray head (22) to rotate around the circumference of the thickener (1) to spray the medicine, thereby increasing the range of the spray head (22) spraying the medicine.

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