Acid mist recovery system with gas-liquid separation function for electrolytic bath

Abstract

The utility model discloses an acid mist recovery system with a gas-liquid separation function for an electrolytic bath. The acid mist recovery system comprises a diaphragm bag arranged on an anode plate in a sleeving mode, and a containing cavity used for containing anode liquid and acid mist is formed in the diaphragm bag; the gas-liquid separation device is provided with a separation cavity, an anolyte outlet and an acid mist outlet, the anolyte outlet and the acid mist outlet are both communicated with the separation cavity, and the anolyte outlet is lower than the acid mist outlet; the suction device is communicated with the separation device; wherein the suction device sucks the anolyte and the acid mist in the diaphragm bag into the separation cavity for separation, and the separated anolyte and acid mist flow out through the anolyte outlet and the mist outlet respectively; compared with the prior art, the scheme has the advantages that anolyte and acid mist generated in the electrodeposition process can be recycled, and the anolyte and the acid mist are separated.

Description

Technical Field

[0001] This application relates to the field of metal electrolytic refining technology in the electrochemical industry, and in particular to an acid mist recovery system for an electrolytic cell with gas-liquid separation function. Background Technology

[0002] Traditional electrolysis technology involves placing the anode and cathode in a tank where the electrolyte flows slowly. Under the influence of an electric field, anions move directionally towards the anode and cations move directionally towards the cathode. By controlling certain technical conditions, the target metal cations are electrolytically deposited at the cathode, thereby obtaining high-purity electrolytic products.

[0003] Taking nickel sulfate electrowinning as an example:

[0004] The nickel sulfate electrowinning process uses NiSO4 as the electrolyte, and the following electrode reactions occur under the action of direct current:

[0005] Cathode reaction: Ni 2+ +2e=Ni,2H + +2e = H2;

[0006] The anode uses a quaternary alloy or titanium plated with lead dioxide as the anode plate. Because a passivation film forms on its surface, preventing the ionization of the anode metal, the main reaction at the anode is:

[0007] 2H₂O-4e=O₂+4H + .

[0008] That is, nickel is electrolytically deposited at the cathode, and a side reaction occurs, releasing a small amount of hydrogen gas; acid is produced at the anode (H+ combines with sulfate ions), and oxygen is released at the same time.

[0009] The nickel sulfate electrowinning process generates a large number of oxygen atoms and hydrogen ions that remain in the anolyte within the electrowinning cell for an extended period. Hydrogen ions react with sulfate ions to form sulfuric acid. As electrowinning progresses, oxygen atoms combine to form oxygen gas, which further forms bubbles carrying sulfuric acid and overflowing from the cell surface, generating acid mist. During operation, a diaphragm bag is installed outside the anode plate, forming a cavity to contain the anolyte and acid mist. If the acid mist is not properly treated, it will overflow, causing not only environmental pollution but also harm to human health.

[0010] Therefore, it is necessary to propose a new technical solution to overcome the shortcomings of existing technologies. Utility Model Content

[0011] To address the aforementioned issues, this application provides an acid mist recovery system for an electrolytic cell with gas-liquid separation function, capable of recovering the anolyte and acid mist generated during electrowinning.

[0012] This application provides an acid mist recovery system for an electrolytic cell with gas-liquid separation function, including a diaphragm bag fitted on an anode plate, wherein a receiving cavity for containing anolyte and acid mist is formed inside the diaphragm bag;

[0013] Also includes:

[0014] A gas-liquid separation device includes a separation chamber and an anolyte outlet and an acid mist outlet, both connected to the separation chamber, wherein the anolyte outlet is lower than the acid mist outlet; and

[0015] A suction device connected to the separation device;

[0016] The suction device draws the anolyte and acid mist from the diaphragm bag into the separation chamber for separation. The separated anolyte and acid mist then flow out through the anolyte outlet and the mist outlet, respectively.

[0017] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0018] Optionally, the anolyte outlet is located at the bottom of the separation chamber.

[0019] Optionally, the gas-liquid separation device further includes an inlet, and the receiving cavity is connected to the separation cavity via the inlet;

[0020] The inlet is higher than the outlet of the anolyte.

[0021] Optional, also includes:

[0022] A suction tube with a suction port is provided, the suction tube connecting the inlet and the receiving cavity, the suction port being used to suction the anolyte and acid mist in the receiving cavity.

[0023] Optionally, the suction area of ​​the suction port is divided into at least a first part and a second part, wherein the first part is adapted to be immersed in the anolyte to extract the anolyte, and the second part is adapted to be exposed outside the anolyte to extract acid mist.

[0024] Optionally, the suction tube is connected to the inlet via a manifold.

[0025] Optionally, the suction device is connected to the acid mist outlet.

[0026] Optional, also includes:

[0027] A collection tank is connected to the anolyte outlet to receive the anolyte flowing out of the anolyte outlet.

[0028] Optionally, the receiving cavity, the gas-liquid separation device, and the collecting tank are arranged along the direction of gravity.

[0029] Optionally, the anolyte outlet is connected to the collecting tank via a U-shaped pipe.

[0030] This application discloses an acid mist recovery system for an electrolytic cell with gas-liquid separation function. During the operation of an electrolytic cell, anolyte and accompanying acid mist are generated on the anode plate. If these substances are not effectively treated, they will not only reduce electrolysis efficiency but may also cause harm to the environment and workers. This acid mist recovery system forms a containment cavity by installing a diaphragm bag on the anode plate to collect the anolyte and acid mist.

[0031] The suction device is responsible for drawing the anolyte and acid mist from the diaphragm bag into the separation chamber, ensuring that the anolyte and acid mist can smoothly enter the separation chamber for separation.

[0032] The gas-liquid separation device has a separation chamber and an anolyte outlet and an acid mist outlet, both connected to the separation chamber. The anolyte outlet is designed to be lower than the acid mist outlet, ensuring that when the anolyte and acid mist are drawn into the separation chamber, gravity causes the anolyte to settle at the bottom of the chamber, while the acid mist rises, effectively separating the two. This effective separation reduces their interference with the electrolysis process, thereby improving electrolysis efficiency. The effective separation of anolyte and acid mist also makes subsequent processing more efficient, saving on processing costs. The separated anolyte and acid mist can then undergo more specialized treatment, reducing their environmental pollution. Attached Figure Description

[0033] Figure 1 A schematic diagram of an electrolytic cell and an acid mist recovery system provided in this application;

[0034] Figure 2 for Figure 1 A schematic diagram of a local structure in the image;

[0035] Figure 3 for Figure 1 A schematic diagram of a local structure in the image;

[0036] Figure 4 for Figure 3 A schematic diagram of a local structure in the image;

[0037] Figure 5 for Figure 4 The sectional view in the image.

[0038] Figure 6 for Figure 5 A magnified structural diagram of part A in the diagram;

[0039] Figure 7 This is a schematic diagram of the electrolytic cell and acid mist recovery system in this application.

[0040] The annotations in the figure are explained as follows:

[0041] 10. Electrolytic cell; 11. Reservoir; 12. Cathode liquid level; 13. Anode liquid level; 14. Overflow device; 141. Overflow port;

[0042] 20. Anode plate;

[0043] 30. Diaphragm bag; 31. Receiving cavity;

[0044] 40. Gas-liquid separation device; 41. Separation chamber; 42. Anode liquid outlet; 43. Acid mist outlet; 44. Inlet; 45. Shell;

[0045] 50. Suction tube; 51. Suction port; 511. First part; 512. Second part; 52. First mounting joint; 53. Second mounting joint; 54. Third mounting joint; 55. First pipe section; 56. Second pipe section;

[0046] 60. Manifold;

[0047] 70. Suction device;

[0048] 80. Collection trough; 81. U-shaped pipe. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] It should be noted that when a component is said to be "connected" to another component, it can be directly connected to the other component or it can be connected to a component in between. When a component is said to be "set on" another component, it can be directly set on the other component or it may be set to a component in between.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0052] like Figures 1 to 7As shown, this application provides an acid mist recovery system for an electrolytic cell 10 with gas-liquid separation function, including a diaphragm bag 30 sleeved on an anode plate 20, with a receiving cavity 31 formed inside the diaphragm bag 30 for containing anolyte and acid mist; it also includes a gas-liquid separation device 40 and a suction device 70, the gas-liquid separation device 40 having a separation cavity 41 and an anode liquid outlet 42 and an acid mist outlet 43 both connected to the separation cavity 41, the anode liquid outlet 42 being lower than the acid mist outlet 43; the suction device 70 is connected to the separation device; wherein, the suction device 70 draws the anolyte and acid mist in the diaphragm bag 30 into the separation cavity 41 for separation, and the separated anolyte and acid mist flow out through the anode liquid outlet 42 and the mist outlet, respectively.

[0053] During the operation of the electrolytic cell 10, anolyte and accompanying acid mist are generated on the anode plate 20. If these substances are not effectively treated, they will not only reduce the electrolysis efficiency but may also cause harm to the environment and workers. This acid mist recovery system forms a receiving cavity 31 by covering the anode plate 20 with a diaphragm bag 30 to collect the anolyte and acid mist.

[0054] The suction device 70 is responsible for suctioning the anolyte and acid mist in the diaphragm bag 30 into the separation chamber 41, ensuring that the anolyte and acid mist can smoothly enter the separation chamber 41 for separation.

[0055] The gas-liquid separation device 40 has a separation chamber 41, and an anolyte outlet 42 and an acid mist outlet 43 respectively connected to the separation chamber 41. The anolyte outlet 42 is designed to be lower than the acid mist outlet 43, ensuring that when the anolyte and acid mist are drawn into the separation chamber 41, the anolyte will settle at the bottom of the separation chamber 41 due to gravity, while the acid mist will rise, thus effectively separating the anolyte and acid mist. Effective separation of anolyte and acid mist reduces their interference with the electrolysis process, thereby improving electrolysis efficiency. The effective separation of anolyte and acid mist makes subsequent processing more efficient, thus saving processing costs. The separated anolyte and acid mist can be subjected to more specialized treatment, reducing their environmental pollution.

[0056] In this embodiment, as Figures 2 to 3 As shown, the structure of the electrolytic cell 10 is not strictly limited, as long as it forms a receiving tank 11 to accommodate the anode plate 20, the diaphragm bag 30, and the catholyte, etc., for electrowinning. For example, the electrolytic cell 10 is generally rectangular in shape. The height of the catholyte in the electrolytic cell 10 is higher than the height of the anolyte in the diaphragm bag 30, so as to ensure that the anolyte can penetrate from the diaphragm bag 30 into the diaphragm bag 30.

[0057] In this embodiment, as Figures 2 to 3As shown, the electrolytic cell 10 has an overflow device 14 that limits the catholyte level. The overflow device 14 is connected to a receiving tank 11. When the catholyte level in the receiving tank 11 exceeds a set value, the excess catholyte will flow out through the overflow device 14. The overflow device 14 is used to limit the catholyte level, control the electrolyte flow direction, improve sulfur electrowinning efficiency, and increase the yield of electrowinning metal. The overflow device 14 is located on one side of the electrolytic cell 10 and has an overflow port 141 connected to the receiving tank 11; excess catholyte can flow out through the overflow port 141.

[0058] In this embodiment, as Figures 2 to 4 As shown, there are multiple anode plates 20, and each anode plate 20 is covered with a diaphragm bag 30. The suction device 70 can draw the anolyte and acid mist in each diaphragm bag 30 into the gas-liquid separator 40.

[0059] In this embodiment, as Figures 3 to 5 As shown, the top of the diaphragm bag 30 has an opening for the anode plate 20 to be removed or inserted. The top of the diaphragm bag 30 forms a cavity; the acid mist generated inside the diaphragm bag 30, due to the resistance of the diaphragm bag 30, can only accumulate in the cavity. The diaphragm bag 30 is sealed to prevent acid mist from overflowing, and the suction device 70 can completely extract the anolyte and acid mist from the diaphragm bag 30. In other embodiments, the diaphragm bag 30 has a balance port, which balances the pressure difference inside and outside the diaphragm bag 30, preventing problems such as rupture or leakage due to excessive pressure. The balance port and the suction port 51 are located on opposite sides of the diaphragm bag 30; when the anolyte and acid mist are extracted, the pressure inside the diaphragm bag 30 gradually decreases. At this time, external air or liquid can enter the diaphragm bag 30 through the balance port, thereby maintaining pressure balance inside and outside the diaphragm bag 30, thus preventing problems such as rupture or leakage due to excessive pressure.

[0060] In this embodiment, as Figures 1 to 2 As shown, the gas-liquid separation device 40 includes a housing 45, with a separation chamber 41 formed inside the housing 45. An anolyte outlet 42 and an acid mist outlet 43 are formed on the walls constituting the housing 45. The shape of the housing 45 is not strictly limited; for example, the housing 45 may be approximately columnar. The housing 45 includes a bottom wall and side walls, and the space enclosed by the bottom wall and side walls forms the separation chamber 41.

[0061] In this embodiment, as Figures 1 to 2As shown, the anolyte outlet 42 is located at the bottom of the separation chamber 41 to ensure timely discharge of the anolyte from the outlet 42. The bottom of the separation chamber 41 can be understood as the bottom wall of the casing 45. The acid mist recovery system for the electrolytic cell 10 also includes a collecting tank 80, which is connected to the anolyte outlet 42 to collect the anolyte flowing out of the outlet 42. The receiving chamber 31, the gas-liquid separation device 40, and the collecting tank 80 are arranged along the direction of gravity. The anolyte outlet 42 is connected to the collecting tank 80 via a U-shaped pipe 81. The design of the U-shaped pipe 81 ensures that the anolyte remains within the pipe, preventing acid mist from entering the collecting tank 80. Instead, the acid mist is drawn upwards through the slight negative pressure of the suction device 70 into the acid mist outlet 43, while the anolyte enters the bottom anolyte outlet 42, effectively separating the anolyte and acid mist.

[0062] In this embodiment, as Figures 1 to 2 As shown, the acid mist outlet 43 is located on the side wall of the housing 45. A suction device 70 is connected to the acid mist outlet 43 to allow the acid mist to be smoothly discharged through the outlet 43. The suction device 70 can be a blower, which is connected to the acid mist outlet 43 via a pipe.

[0063] In this embodiment, as Figures 1 to 2 As shown, the gas-liquid separation device 40 also has an inlet 44, and the receiving cavity 31 is connected to the separation cavity 41 via the inlet 44; the inlet 44 is higher than the anolyte outlet 42, which is beneficial for the separation of anolyte and acid mist. The inlet 42 and the acid mist outlet 43 are set at approximately the same height and are located on the radial sides of the housing 45, respectively.

[0064] In this embodiment, as Figures 3 to 7 As shown, the acid mist recovery system for the electrolytic cell 10 also includes a suction pipe 50 with a suction port 51. The suction pipe 50 connects to the inlet 44 and the receiving cavity 31. The suction port 51 is used to suction the anolyte and acid mist in the receiving cavity 31. The suction device 70 suctions the anolyte and acid mist in the receiving cavity 31 through the suction pipe 50, realizing the simultaneous recovery of anolyte and acid mist, thereby improving the recovery efficiency. By suctioning the anolyte in the receiving cavity 31, a level difference is formed between the catholyte inside and outside the diaphragm bag 30. This ensures that the catholyte outside the diaphragm bag 30 penetrates into the diaphragm bag 30, and the catholyte level is higher than the anolyte level. Under the action of the level difference, the anolyte in the diaphragm bag 30 will not flow back into the catholyte in the electrolytic cell 10, while the catholyte in the electrolytic cell 10 flows into the diaphragm bag 30 and mixes with the anolyte. The suction pipe 50 is connected to the inlet 44 via the manifold; the anolyte and acid mist drawn by each suction pipe 50 are all collected in the manifold 60.

[0065] In this embodiment, as Figures 3 to 7As shown, the suction area of ​​the suction port 51 is divided into at least a first part 511 and a second part 512. The first part 511 is adapted to be immersed in the anolyte to extract the anolyte, and the second part 512 is adapted to be exposed outside the anolyte to extract acid mist. The suction port 51 of the suction pipe 50 is divided into the first part 511 and the second part 512. This arrangement simplifies the structure of the system, makes it easy to operate, and reduces energy consumption and cost.

[0066] In this embodiment, as Figures 3 to 7 As shown, the suction tube 50 passes through the diaphragm bag 30 and is attached to the anode plate 20, enabling the anode plate 20 to provide support for the suction tube 50. The anode plate 20 has a mounting hole for mounting the suction tube 50; one end of the suction tube 50 is inserted into the mounting hole to facilitate the attachment and removal of the suction tube 50 from the anode plate 20. The mounting hole is a through hole; one end of the suction tube 50 is inserted into the through hole.

[0067] In this embodiment, as Figures 3 to 7 As shown, the suction tube 50 may include one or more sections of tube; when the suction tube 50 includes multiple sections of tube, adjacent sections are connected by a connector. Specifically, the suction tube 50 includes a first mounting connector 52, a second mounting connector 53, a third mounting connector 54, a first tube section 55, and a second tube section 56; the first mounting connector 52 is inserted into a mounting hole; the side wall of the electrolytic cell 10 has a through hole, the second mounting connector 53 is located inside the electrolytic cell 10 and is inserted into the through hole, and the third mounting connector 54 is located outside the electrolytic cell 10 and is inserted into the through hole; one end of the first tube section 55 is connected to the first mounting connector 52, and the other end is connected to the second mounting connector 53; one end of the second tube section 56 is connected to the third mounting connector 54, and the other end is connected to the manifold 60.

[0068] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0069] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are quite specific and detailed. However, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. An acid mist recovery system for an electrolytic cell with gas-liquid separation function, comprising a diaphragm bag fitted onto an anode plate, wherein a receiving cavity for containing anolyte and acid mist is formed inside the diaphragm bag; Its features are, Also includes: A gas-liquid separation device has a separation chamber and an anolyte outlet and an acid mist outlet, both of which are connected to the separation chamber, wherein the anolyte outlet is lower than the acid mist outlet. and A suction device connected to the separation device; The suction device draws the anolyte and acid mist from the diaphragm bag into the separation chamber for separation. The separated anolyte and acid mist then flow out through the anolyte outlet and the mist outlet, respectively.

2. The acid mist recovery system for an electrolytic cell with gas-liquid separation function according to claim 1, characterized in that, The anolyte outlet is located at the bottom of the separation chamber.

3. The acid mist recovery system for an electrolytic cell with gas-liquid separation function according to claim 1, characterized in that, The gas-liquid separator also has an inlet, and the receiving cavity is connected to the separation cavity via the inlet; The inlet is higher than the outlet of the anolyte.

4. The acid mist recovery system for an electrolytic cell with gas-liquid separation function according to claim 3, characterized in that, Also includes: A suction tube with a suction port is provided, the suction tube connecting the inlet and the receiving cavity, the suction port being used to suction the anolyte and acid mist in the receiving cavity.

5. An acid mist recovery system for an electrolytic cell with gas-liquid separation function according to claim 4, characterized in that, The suction area of ​​the suction port is divided into at least a first part and a second part, the first part being adapted to be immersed in the anolyte to extract the anolyte, and the second part being adapted to be exposed outside the anolyte to extract acid mist.

6. An acid mist recovery system for an electrolytic cell with gas-liquid separation function according to claim 4, characterized in that, The suction tube is connected to the inlet via a collection tube.

7. An acid mist recovery system for an electrolytic cell with gas-liquid separation function according to claim 1, characterized in that, The suction device is connected to the acid mist outlet.

8. An acid mist recovery system for an electrolytic cell with gas-liquid separation function according to claim 1, characterized in that, Also includes: A collection tank is connected to the anolyte outlet to receive the anolyte flowing out of the anolyte outlet.

9. An acid mist recovery system for an electrolytic cell with gas-liquid separation function according to claim 8, characterized in that, The receiving cavity, the gas-liquid separation device, and the collecting tank are arranged along the direction of gravity.

10. An acid mist recovery system for an electrolytic cell with gas-liquid separation function according to claim 1, characterized in that, The anolyte outlet is connected to the collecting tank via a U-shaped pipe.

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