Thickener defoaming device

Abstract

The defoaming device comprises a water tank, a liquid level meter is arranged on the side portion of the water tank, the liquid level meter and the water tank are connected through a flange, a water inlet pipe, a water outlet pipe and a water drainage pipe are sequentially arranged on the side portion of the water tank from top to bottom, the water inlet pipe is provided with a first valve, and the water outlet pipe is provided with a pressure pump, a second valve and a pressure sensor. The drain pipe is provided with a third valve, one end of the water outlet pipe is communicated with the water tank, the other end of the water outlet pipe is communicated with the defoaming water main pipe, the side part of the defoaming water main pipe is provided with a plurality of defoaming water branch pipes, one end of each defoaming water branch pipe is communicated with the defoaming water main pipe, and the other end of each defoaming water branch pipe is provided with a pressurizing nozzle. According to the utility model, foams on the surface of the thickener can be eliminated in time, so that an operator can accurately judge the sedimentation condition in the thickener, and the production and equipment safety is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of beneficiation equipment and relates to a defoaming device for a thickener. Background Art

[0002] As an important piece of equipment in the beneficiation industry, a thickener is mainly used for concentrating pulp, separating solid particles and liquid in the pulp, so as to increase the solid content and reduce the liquid volume. The working principle of the thickener is that through gravitational sedimentation and mechanical action, solid particles settle to the bottom and are discharged through the bottom discharge port, while the upper liquid is discharged outside the machine through the overflow tank, realizing solid-liquid separation. Due to the action of beneficiation flotation reagents, a layer of foam will form on the surface of the clarified liquid above the thickener after the concentrate enters the thickener. This foam is a three-phase foam of solid, liquid and gas, with a certain stability and is difficult to break for a long time. The foam will carry away a large amount of concentrate with the clarified liquid, resulting in metal loss and economic losses. Especially in winter, the foam layer is thicker, and the operator cannot judge the sedimentation condition inside the thickener, which is prone to production or equipment accidents. Therefore, it is necessary to eliminate the foam on the surface of the thickener in time. Content of the Utility Model

[0003] The purpose of the utility model is to provide a defoaming device for a thickener aiming at the problems existing in the prior art, and solve the problem that a foam layer forms on the surface of the clarified liquid above the existing thickener, resulting in the inability to judge the sedimentation condition of the pulp.

[0004] For this reason, the utility model adopts the following technical solutions:

[0005] A defoaming device for a thickener includes a water tank. A liquid level gauge is arranged on the side of the water tank, and the two are connected by a flange. An inlet pipe, an outlet pipe and a drain pipe are successively arranged on the side of the water tank from top to bottom. A first valve is arranged on the inlet pipe, and a pressure pump, a second valve and a pressure sensor are arranged on the outlet pipe. A third valve is arranged on the drain pipe; one end of the outlet pipe is communicated with the water tank and the other end is communicated with a main defoaming water pipe. A plurality of defoaming water branch pipes are arranged on the side of the main defoaming water pipe. One end of each defoaming water branch pipe is communicated with the main defoaming water pipe and the other end is provided with a pressure spray head.

[0006] Furthermore, the controller is electrically connected to the liquid level gauge, the first valve, the pressure pump, the second valve, the pressure sensor and the third valve respectively.

[0007] Specifically, the controller adopts a PLC controller; the liquid level gauge adopts a magnetic flap liquid level gauge.

[0008] Furthermore, a ball valve is arranged on the defoaming water branch pipe; the defoaming water branch pipe is in an L shape, and a rotary joint is arranged between it and the pressure spray head, and the three are in a communicating state.

[0009] The beneficial effects of the present utility model are as follows:

[0010] The present utility model adopts the method of high-pressure water flushing, which can quickly eliminate the foam formed on the surface of the clarified liquid above the thickener, reduce the large amount of concentrate carried away by the foam with the clarified liquid, avoid economic losses, enable the operator to accurately judge the sedimentation condition inside the thickener, and ensure production and equipment safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the present utility model;

[0012] Figure 2 is a schematic connection diagram of the main defoaming water pipe and the defoaming water branch pipe in the present utility model.

[0013] In the figure, 1 - water tank, 2 - liquid level gauge, 3 - water inlet pipe, 4 - first valve, 5 - water outlet pipe, 6 - pressure pump, 7 - second valve, 8 - pressure sensor, 9 - drain pipe, 10 - third valve, 11 - main defoaming water pipe, 12 - ball valve, 13 - defoaming water branch pipe, 14 - rotary joint, 15 - pressure nozzle, 16 - thickener. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The technical solutions of the present utility model will be described in detail below in conjunction with the drawings and the embodiments.

[0015] As Figure 1 shown, a defoaming device for a thickener includes a water tank 1. A liquid level gauge 2 is provided on the side of the water tank 1, and the two are connected by a flange. Specifically, the water tank 1 is used to store the defoaming water source. To ensure the energy-saving performance of the defoaming device, the overflow water of the thickener can be directly used as the water source to reduce the waste of fresh water. To avoid the influence of anions in the overflow water on the water tank, the material of the water tank 1 is selected as stainless steel plate to extend its service life. At the same time, the water tank 1 is designed as a sealed structure to prevent water from overflowing. The liquid level gauge 2 adopts a magnetic flap liquid level gauge. Compared with a radar liquid level gauge or an ultrasonic liquid level gauge, the magnetic flap liquid level gauge can better ensure the measurement accuracy and reliability. To realize the automatic control of the water tank liquid level, the liquid level gauge 2 needs to output a 4 - 20 mA current signal as the input signal of the controller.

[0016] A water inlet pipe 3, a water outlet pipe 5 and a drain pipe 9 are sequentially provided on the side of the water tank 1 from top to bottom. A first valve 4 is provided on the water inlet pipe 3, and a pressure pump 6, a second valve 7 and a pressure sensor 8 are provided on the water outlet pipe 5. Specifically, the pressure pump 6 is used to increase the pressure of the defoaming water to ensure the defoaming efficiency. To facilitate the installation and maintenance of the pressure pump 6, the pressure pump 6 is installed on the front horizontal pipe of the water outlet pipe 5. At the same time, to facilitate the automatic adjustment of the defoaming water pressure according to the foam thickness, the drive motor of the pressure pump 6 uses a variable frequency speed regulation motor. In addition, the pressure sensor 8 outputs a 4 - 20 mA current signal to the controller for transmitting and controlling the pressure of the water outlet pipe.

[0017] The drain pipe 9 is used for draining water during the maintenance of the water tank and for daily sewage discharge, and it is provided with a third valve 10; one end of the water outlet pipe 5 is connected to the water tank 1 and the other end is connected to the main defoaming water pipe 11. A number of defoaming water branch pipes 13 are provided on the side of the main defoaming water pipe 11. One end of the defoaming water branch pipe 13 is connected to the main defoaming water pipe 11 and the other end is provided with a pressurized nozzle 15; specifically, the main defoaming water pipe 11 of the thickener is installed on the pedestrian truss of the thickener 16 and is horizontally laid along the outside of the pedestrian truss. Ball valves 12 are fixed at different intervals of the main defoaming water pipe 11 for facilitating the maintenance of individual branch pipes. A number of defoaming water branch pipes 13 are installed at the outlets of the ball valves 12. The defoaming water branch pipes 13 are in an L shape and are connected to the pressurized nozzles 15 through rotary joints 14.

[0018] Specifically, the rotary joint 14 can achieve 360-degree rotation. The operator can operate the rotation angle of the rotary joint according to the foam condition to adjust the impact direction or position of the defoaming water and achieve fixed-point defoaming.

[0019] The pressurized nozzle 15 is in a duckbill shape, and the water outlet direction of the nozzle is perpendicular to the direction of the main defoaming water pipe 11, so as to ensure that the water jet formed after the defoaming water sprays out from the pressurized nozzle 15 can vertically cut the rotating direction of the foam and ensure the defoaming efficiency.

[0020] The utility model further includes a controller, and the controller is electrically connected to the liquid level gauge 2, the first valve 4, the pressurizing pump 6, the second valve 7, the pressure sensor 8 and the third valve 10 respectively; specifically, the controller adopts a PLC controller.

[0021] During the use of the utility model, the overflow water of the thickener or other water sources flow into the water tank 1 from the water inlet pipe 3 by gravity. The water source enters the defoaming pipeline from the water outlet pipe 5 through the pressurizing pump 6. The pressure sensor 8 installed on the water outlet pipe is used to detect the water flow pressure of the water outlet pipe 5 and feedback the pressure value to the controller through a 4-20 mA current signal. This pressure value is interlocked with the input frequency of the pressurizing pump 6. When the pressure is high, the input frequency of the pressurizing pump 6 is controlled to decrease, and when the pressure is low, the input frequency of the pressurizing pump 6 is controlled to increase, so as to control the pressure of the defoaming pipe; at the same time, a manual control mode can be set to adjust the pipeline pressure: when the foam thickness is relatively thick, the operator can increase the input frequency of the pressurizing pump 6, and when the foam thickness is relatively small, the input frequency of the pressurizing pump 6 can be reduced to reduce the pipeline pressure; in addition, the liquid level output value of the liquid level gauge 2 is interlocked with the first valve 4 and the second valve 7 to control the liquid level of the water tank.

[0022] Taking the height of the water tank as 3 meters as an example, when the liquid level height of the water tank reaches 2.9 meters, the first valve 4 closes. When the liquid level is lower than 2.8 meters, the first valve 4 automatically opens. The inlet of the water outlet pipe 5 is installed 0.3 meters below the lower edge of the water tank. When the liquid level is lower than 0.4 meters, the second valve 7 automatically closes and the pressurizing pump stops automatically to avoid equipment damage caused by idling.

[0023] When the foam on the surface of the medium in the thickener is less, close the pressure pump 6 and the second valve 7; when the foam is more, open the pressure pump 6 and the second valve 7, adjust the frequency setting of the pressure pump 6 according to the foam thickness to adjust the pipeline pressure, and the defoaming water in the water tank 1 enters the defoaming main pipe 11 through the end of the water outlet pipe 5; when the ball valve 12 installed on the defoaming main pipe 11 is opened, the defoaming water enters several defoaming water branches 13 and is sprayed out through the pressure nozzle 15, and the water jet sprayed out from the pressure nozzle 15 directly impacts the foam on the surface of the medium in the thickener 16. When the foam rotates driven by the walking scaffold in the thickener 16, the water jet cuts the rotating foam, so as to achieve a good defoaming effect.

[0024] In addition, the third valve 10 can be set to open regularly to discharge the sediment at the drain outlet in time. The third valve 10 will automatically close after opening for 1-2 minutes to prevent the drain pipe from being blocked by the sediment in the water tank.

Claims

1. A thickener defoaming device, characterized in that: The invention comprises a water tank (1), wherein a liquid level gauge (2) is provided on the side of the water tank (1), and the two are connected by a flange. The side of the water tank (1) is provided with a water inlet pipe (3), a water outlet pipe (5) and a drainage pipe (9) in order from top to bottom. The water inlet pipe (3) is provided with a first valve (4), the water outlet pipe (5) is provided with a pressure pump (6), a second valve (7) and a pressure sensor (8), and the drainage pipe (9) is provided with a third valve (10); one end of the water outlet pipe (5) is connected to the water tank (1), and the other end is connected to a defoaming water main pipe (11); a plurality of defoaming water branch pipes (13) are provided on the side of the defoaming water main pipe (11); one end of the defoaming water branch pipe (13) is connected to the defoaming water main pipe (11), and the other end is provided with a pressure nozzle (15).

2. A thickener defoaming device according to claim 1, characterized in that: It also includes a controller, which is electrically connected to the liquid level meter (2), the first valve (4), the pressure pump (6), the second valve (7), the pressure sensor (8) and the third valve (10) respectively.

3. A thickener defoaming device according to claim 1, characterized in that: The defoaming water branch pipe (13) is provided with a ball valve (12).

4. A thickener defoaming device according to claim 1, characterized in that: The defoaming water branch pipe (13) is L-shaped, and a rotary joint (14) is provided between the defoaming water branch pipe (13) and the pressure nozzle (15), and the three are in communication.

5. A thickener defoaming device according to claim 1, characterized in that: The liquid level meter (2) is a magnetic flap liquid level meter.

6. A thickener defoaming device according to claim 2, characterized in that: The controller adopts a PLC controller.

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