Defoaming device

Abstract

The utility model discloses a defoaming device which comprises a defoaming tank and a vacuum pump, a separation structure is fixed in the middle of the interior of the defoaming tank, an inlet of the vacuum pump is communicated with the defoaming tank above the separation structure through a first pipeline, a liquid outlet is formed in the bottom of the defoaming tank and is communicated with an inlet of a circulating pump through a second pipeline, and the circulating pump is communicated with the defoaming tank through a second pipeline. An outlet of the circulating pump is communicated with an inlet of the reaction kettle through a circulating material pipe. The defoaming device has the advantages that the defoaming tank is vacuumized by using the vacuum pump, so that bubbles generated by the reaction kettle enter the defoaming tank, the phenomenon that a large number of bubbles inorganized overflow from the tank is avoided, the problem that production cannot be normally carried out due to the fact that the feeding speed needs to be slowed down when the bubbles overflow from the tank is avoided, and the production order is effectively guaranteed. Bubbles entering the defoaming tank can be rapidly broken by utilizing negative pressure vacuum, gas is orderly discharged after being filtered by the filter cloth, slag and liquid carried by the broken bubbles fall into the bottom of the defoaming tank and then are sent back to the leaching tank through the circulating pump to be circularly treated, and material loss and metal loss are avoided.

Description

Technical field:

[0001] The utility model relates to the technical field of aluminum plant waste recycling, in particular to a defoaming device. Background technology:

[0002] Waste materials such as electrolyte, carbon slag, and overhaul slag from aluminum plants contain valuable metal resources such as Li, Na, and K. At present, a method of alkaline leaching to recover valuable metals from the above waste materials has been developed. However, a large number of carbon-wrapped bubbles that are difficult to dissipate will be generated during the alkaline leaching process. During the alkaline leaching process, a large number of bubbles will overflow from the leaching reactor. On the one hand, it will cause serious corrosion to the surface of the production equipment, causing leakage, material loss, and metal loss; on the other hand, it will have a great impact on the production environment. At present, the main way to reduce the amount of bubbles is to slow down the feeding speed, and at the same time, the bubbles produced will slowly settle and break in the reactor, which seriously restricts production efficiency, prolongs the equipment operation cycle, and increases production costs. Utility model content:

[0003] The purpose of the utility model is to provide a defoaming device.

[0004] The utility model is implemented by the following technical scheme: a defoaming device, which comprises a defoaming tank and a vacuum pump, a separation structure is fixed in the middle of the defoaming tank, a feed port is opened on the defoaming tank below the separation structure, the feed port is connected with the foam outlet pipeline of the reactor through a feed pipe, and a feed control valve is installed on the feed pipe; the inlet of the vacuum pump is connected with the defoaming tank above the separation structure through a first pipeline, and a first control valve is installed on the first pipeline; a liquid discharge port is provided at the bottom of the defoaming tank, the liquid discharge port is connected with the inlet of a circulation pump through a second pipeline, a second control valve is installed on the second pipeline, the outlet of the circulation pump is connected with the inlet of the reactor through a circulation material pipe, and a circulation control valve is installed on the circulation material pipe.

[0005] Furthermore, the separation structure includes a perforated plate, a filter cloth and a pressure ring arranged in sequence from top to bottom, the perforated plate is fixed on the inner wall of the upper part of the defoaming tank, and the pressure ring presses the filter cloth under the perforated plate; the pressure ring is connected and fixed to the perforated plate by bolts.

[0006] Furthermore, a central pressure plate is fixed in the middle of the pressure ring, and the central pressure plate is connected and fixed to the orifice plate by bolts.

[0007] Furthermore, a manhole is provided on the side wall of the defoaming tank.

[0008] Furthermore, the inlet of the vacuum pump is connected to the defoaming tank below the separation structure through a third pipeline, and a third control valve is installed on the third pipeline; the top of the defoaming tank is connected to the outlet of the water supply pipe, and a water supply control valve is installed on the water supply pipe; the outlet of the drain port is connected to a drain pipe, and a drain valve is installed on the drain pipe.

[0009] Furthermore, a spiral nozzle is connected to the outlet end of the water supply pipe.

[0010] Furthermore, a first pressure sensor and a second pressure sensor are respectively installed on the defoaming tank above and below the separation structure, the first pressure sensor and the second pressure sensor are connected to the input end of the controller, and the output end of the controller is respectively connected to the circulation pump, the first control valve, the second control valve, the third control valve, the drain valve, the water supply control valve, the feed control valve, and the circulation control valve.

[0011] The utility model has the advantages of using a vacuum pump to evacuate the defoaming tank, so that the bubbles generated by the reactor enter the defoaming tank, avoiding the phenomenon of a large number of bubbles bubbling up in an unorganized manner, avoiding the problem of slowing down the feeding speed due to bubbles bubbling up, which causes the production to be unable to proceed normally, and effectively ensuring the production order. The bubbles entering the defoaming tank can be quickly broken by negative pressure vacuum, and the gas is discharged in an orderly manner after being filtered by the filter cloth. After the bubbles are broken, the slag and liquid entrained fall into the bottom of the defoaming tank, and then are sent back to the leaching tank for circulation treatment through a circulation pump, avoiding material loss and metal loss. Description of the drawings:

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0013] Figure 2 It is a schematic diagram of the structure of the defoaming tank.

[0014] Defoaming tank 1, vacuum pump 2, separation structure 3, feed port 4, discharge port 5, first pipeline 6, first control valve 7, reactor 8, second pipeline 9, circulation pump 10, second control valve 11, third pipeline 12, third control valve 13, spiral nozzle 14, water supply pipe 15, water supply control valve 16, pressure ring 17, drain pipe 18, drain valve 19, first pressure sensor 20, second pressure sensor 21, controller 22, orifice plate 23, filter cloth 24, feed pipe 25, feed control valve 26, circulation pipe 27, circulation control valve 28, central pressure plate 29, manhole 30. Specific implementation method:

[0015] In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0016] like Figure 1 and Figure 2As shown, a defoaming device includes a defoaming tank 1 and a vacuum pump 2. A separation structure 3 is fixed in the middle of the defoaming tank 1. The separation structure 3 includes a perforated plate 23, a filter cloth 24 and a pressure ring 17 arranged from top to bottom. The perforated plate 23 is fixed on the inner wall of the upper part of the defoaming tank 1. The pressure ring 17 presses the filter cloth 24 under the perforated plate 23. The pressure ring 17 is connected and fixed to the perforated plate 23 by bolts. The perforated plate 23 plays the role of supporting the filter cloth and passing the air flow. The pressure ring 17 can press the filter cloth 24 to the bottom of the perforated plate 23. The pressure ring 17 and the perforated plate 23 are connected by bolts, which is convenient for disassembly and assembly, and is convenient for maintenance and replacement of the filter cloth. A central pressure plate 29 is fixed in the middle of the pressure ring 17. The central pressure plate 29 is connected and fixed to the perforated plate 23 by bolts. The filter cloth 24 can be further pressed to the bottom of the perforated plate 23 by the central pressure plate 29. A manhole 30 is provided on the side wall of the defoaming tank 1, and the staff can enter the defoaming tank 1 through the manhole to perform inspection and maintenance. The filter cloth 24 in this embodiment is a 1000-mesh polypropylene filter cloth. A feed port 4 is provided on the defoaming tank 1 below the separation structure 3, and the feed port 4 is connected to the foam outlet pipeline of the reactor 8 through a feed pipe 25. A feed control valve 26 is installed on the feed pipe 25. When the feed control valve 26 is opened, the foam in the reactor 8 can enter the defoaming tank 1 through the feed pipe 25. The inlet of the vacuum pump 2 is connected to the defoaming tank 1 above the separation structure through the first pipeline 6, and a first control valve 7 is installed on the first pipeline 6; when the first control valve 7 is opened, the vacuum pump 2 can evacuate the defoaming tank 1 above the separation structure 3 through the first pipeline 6; the foam discharged from the reactor 8 is drawn into the defoaming tank 1 through negative pressure vacuum, and the large bubbles are forcibly destroyed by the negative pressure vacuum, and then the gas is drawn out of the tank through the separation structure 3 on the upper part of the defoaming tank 1 and discharged into the flue gas treatment system, and the slag and liquid entrained by the bubbles are collected in the defoaming tank 1 below. There is a drain port 5 at the bottom of the defoaming tank 1, and the drain port 5 is connected to the inlet of the circulation pump 10 through the second pipeline 9, and a second control valve 11 is installed on the second pipeline 9. The outlet of the circulation pump 10 is connected to the inlet of the reactor 8 through the circulation pipe 27, and a circulation control valve 28 is installed on the circulation pipe 27. The second control valve 11 and the circulation control valve 28 are opened, and the circulation pump 10 is started to send the slag and liquid at the bottom of the defoaming tank 1 back to the reactor 8 for circulation treatment.

[0017] The inlet of the vacuum pump 2 is connected to the defoaming tank 1 below the separation structure 3 through the third pipeline 12, and a third control valve 13 is installed on the third pipeline 12; the top of the defoaming tank 1 is connected to the outlet of the water supply pipe 15, and a spiral nozzle 14 is connected to the outlet end of the water supply pipe 15, and a water supply control valve 16 is installed on the water supply pipe 15; the outlet of the liquid discharge port 5 is connected to an emptying pipe 18, and an emptying valve 19 is installed on the emptying pipe 18. When the filter cloth 24 is blocked and backwashing is required, the first control valve 7, the second control valve 11, the feed control valve 26 and the circulation pump 10 can be closed, and the third control valve 13 and the water supply control valve 16 can be opened. The vacuum pump 2 evacuates the lower part of the defoaming tank 1 through the third pipeline 12, so that the water sent from the water supply pipe 15 passes through the filter cloth 24 from top to bottom to achieve backwashing. The flushing water is not emptied and stored in the lower part of the defoaming tank 1. When a certain liquid level is reached, it is sent to the reactor 8 through the circulation pump 10.

[0018] Preferably, a first pressure sensor 20 and a second pressure sensor 21 are respectively installed on the defoaming tank 1 above and below the separation structure 3, and the first pressure sensor 20 and the second pressure sensor 21 are connected to the input end of the controller 22, and the output end of the controller 22 is respectively connected to the circulation pump 10, the first control valve 7, the second control valve 11, the third control valve 13, the drain valve 19, the water supply control valve 16, the feed control valve 26, and the circulation control valve 28. The first pressure sensor 20 and the second pressure sensor 21 can detect the pressure at the top and bottom of the defoaming tank 1 respectively, and transmit the detected pressure data to the controller 13. When the pressure difference between the first and second pressure sensors exceeds the pressure difference required by the process, it indicates that the filter cloth 24 is seriously blocked. At this time, the third control valve 13, the second control valve 11, and the feed control valve 26 are controlled to be closed, and the circulation pump 10 is stopped to prevent the foam from entering the defoaming tank 1. At the same time, the third control valve 13 and the water supply control valve 16 are controlled to be opened, and the vacuum pump 2 is used to evacuate the lower part of the defoaming tank 1. At the same time, water is supplied to the top of the separation structure 3 through the water supply pipe 15 to realize the backwashing of the filter cloth 24. After backwashing for a period of time, the third control valve 13, the water supply control valve 16 and the drain valve 19 are closed, the first control valve 7, the second control valve 11, and the feed control valve 26 are opened, and the circulation pump 10 is started to put the defoaming tank 1 into operation again.

[0019] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A defoaming device, characterized in that: It includes a defoaming tank and a vacuum pump, a separation structure is fixed in the middle of the defoaming tank, a feed port is opened on the defoaming tank below the separation structure, the feed port is connected with the foam outlet pipeline of the reactor through a feed pipe, and a feed control valve is installed on the feed pipe; the inlet of the vacuum pump is connected with the defoaming tank above the separation structure through a first pipeline, and a first control valve is installed on the first pipeline; a drain port is provided at the bottom of the defoaming tank, the drain port is connected with the inlet of a circulation pump through a second pipeline, a second control valve is installed on the second pipeline, the outlet of the circulation pump is connected with the inlet of the reactor through a circulation material pipe, and a circulation control valve is installed on the circulation material pipe.

2. A defoaming device according to claim 1, characterized in that: The separation structure includes a perforated plate, a filter cloth and a pressure ring arranged in sequence from top to bottom. The perforated plate is fixed on the inner wall of the upper part of the defoaming tank, and the pressure ring presses the filter cloth under the perforated plate; the pressure ring is connected and fixed to the perforated plate by bolts.

3. A defoaming device according to claim 2, characterized in that: A central pressure plate is fixed in the middle of the pressure ring, and the central pressure plate is connected and fixed to the orifice plate by bolts.

4. A defoaming device according to claim 1, characterized in that: A manhole is arranged on the side wall of the defoaming tank.

5. A defoaming device according to claim 2, characterized in that: The inlet of the vacuum pump is connected to the defoaming tank below the separation structure through a third pipeline, and a third control valve is installed on the third pipeline; the top of the defoaming tank is connected to the outlet of the water supply pipe, and a water supply control valve is installed on the water supply pipe; the outlet of the drain port is connected to an exhaust pipe, and an exhaust valve is installed on the exhaust pipe.

6. A defoaming device according to claim 5, characterized in that: The outlet end of the water supply pipe is connected with a spiral spray nozzle.

7. A defoaming device according to claim 5, characterized in that: A first pressure sensor and a second pressure sensor are respectively installed on the defoaming tank above and below the separation structure, and the first pressure sensor and the second pressure sensor are connected to the input end of the controller, and the output end of the controller is respectively connected to the circulation pump, the first control valve, the second control valve, the third control valve, the drain valve, the water supply control valve, the feed control valve, and the circulation control valve.

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