Aluminum oxide vibration blanking equipment of aluminum electrolysis cell

Abstract

The utility model relates to the technical field of aluminum electrolysis cells, and particularly discloses aluminum oxide vibration blanking equipment of an aluminum electrolysis cell, which comprises an electrolysis cell body, a plurality of springs, a drying mechanism, two air suction filtering mechanisms and a blanking auxiliary mechanism, a drying mechanism used for drying aluminum oxide is arranged among the springs, two air suction filtering mechanisms used for sucking hot air flow in the electrolytic bath body are arranged on the drying mechanism, and a discharging auxiliary mechanism used for feeding the aluminum oxide into the electrolytic bath body is arranged on the drying mechanism. The aluminum oxide discharging mechanism solves the technical problems that moisture adsorbed on aluminum oxide powder is not removed in the discharging process of an existing aluminum oxide discharging mechanism, if the aluminum oxide powder with moisture is directly injected into an electrolytic bath, explosion is likely to happen, a production device is damaged, and the safety of workers is threatened.

Description

Technical Field

[0001] This utility model relates to the field of aluminum electrolysis cell technology, and specifically discloses an alumina vibration feeding device for aluminum electrolysis cells. Background Technology

[0002] In the aluminum electrolysis industry, alumina, as the core raw material for the electrolysis reaction, needs to be continuously and evenly injected into the electrolytic cell through feeding equipment to maintain the dynamic balance of the electrolysis reaction. Currently, domestic aluminum electrolysis plants feed alumina powder into the electrolytic cell intermittently and quantitatively through a constant-volume feeder. The constant-volume feeder includes a space of a certain volume and upper and lower cones. Under the existing electrolytic cell operation method, the upper cone is opened to allow alumina to enter the constant-volume feeder from the alumina hopper. Then, the upper cone is closed and the lower cone is opened to allow all the alumina in the constant-volume feeder to enter the electrolytic cell.

[0003] For example, utility model patent CN203174208U discloses a continuous feeding device for an aluminum electrolytic cell and an aluminum electrolytic cell including the feeding device. The device includes an alumina tank with a discharge port at the bottom. The feeding device also includes a conveying pipe and a flow regulating valve. The flow regulating valve includes a valve and an actuator. The conveying pipe is located below the alumina tank, with one end fixedly connected to the discharge port. The valve of the flow regulating valve is installed on the conveying pipe, and the actuator of the flow regulating valve is connected to the cell control mechanism of the aluminum electrolytic cell. This utility model can improve current efficiency by 1%. Simultaneously, it can reduce furnace bottom sedimentation caused by large-scale single-feeding, reducing the furnace bottom voltage drop by approximately 20mV.

[0004] Existing aluminum electrolysis cell feeding devices only improve current efficiency and reduce the problem of sediment settling at the bottom of the furnace. However, improper packaging and sealing during transportation, exposure during loading and unloading, and excessively high humidity in the storage environment can all cause alumina powder to absorb moisture. If alumina powder with absorbed moisture is directly added to the electrolysis cell, the moisture will decompose in the high-temperature electrolysis cell (2H2O→2H2↑+O2↑). The resulting hydrogen gas will mix with oxygen to form an explosive gas (explosion limits 4%-75%), seriously threatening the safety of production equipment and personnel. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide an alumina vibration feeding device for an aluminum electrolytic cell, so as to solve the technical problem that the existing alumina feeding mechanism does not remove the moisture adsorbed on the alumina powder during the feeding process. If the alumina powder with moisture is directly injected into the electrolytic cell, it is easy to explode, which not only damages the production equipment but also threatens the safety of the workers.

[0006] To achieve the above objectives, this utility model provides the following technical solution: It includes an electrolytic cell body, several springs, a drying mechanism, two suction filtration mechanisms, and a feeding auxiliary mechanism. Several springs are fixedly connected to the two inner sidewalls of the electrolytic cell body. A drying mechanism for drying alumina is disposed between the springs. The drying mechanism is equipped with two suction filtration mechanisms for drawing in hot airflow from inside the electrolytic cell body. The feeding auxiliary mechanism is also provided for feeding alumina into the electrolytic cell body. When alumina needs to be fed into the electrolytic cell body, the hot airflow from inside the electrolytic cell body is first drawn into the drying mechanism through the two suction filtration mechanisms, heating the drying mechanism. Then, the alumina is placed into the drying mechanism for drying. After the alumina is dried, it can be accurately fed into the electrolytic cell body through the feeding auxiliary mechanism.

[0007] Furthermore, the drying mechanism includes a drying chamber, a drying inner liner, a flexible connecting belt, a vibration motor, a first drying plate, a second drying plate, and a filter device. The drying chamber is fixedly connected between several springs on the inner sidewall of the electrolytic cell body. The drying inner liner is provided inside the drying chamber, and the drying inner liner is provided with a drying cavity extending through the upper and lower ends. An air supply cavity is provided between the drying chamber and the drying inner liner. The flexible connecting belt is provided between the drying chamber and the electrolytic cell body. The vibration motor is provided on the drying chamber. The first drying plate and the second drying plate are provided inside the drying cavity. The first drying plate and the second drying plate are both hollow and communicate with the air supply cavity. The second drying plate is located below the first drying plate. The first drying plate has two first discharge ports, and the second drying plate has a second discharge port. The filter device for controlling the falling speed of alumina is provided inside the drying chamber. The alumina is dried by a drying mechanism. The first drying plate and the second drying plate gradually dry the alumina. Since the first drying plate and the second drying plate are connected to the air supply cavity, the surface temperature of the first drying plate and the second drying plate is increased, so that the moisture in the alumina evaporates more thoroughly and prevents the alumina with moisture from participating in the preparation process and causing an explosion.

[0008] Furthermore, the filtration device includes a first filter plate, a limiting plate, a second filter plate, a connecting rod, and a hydraulic rod. The first filter plate is disposed inside the drying chamber and is located above the first drying plate. The limiting plate is disposed inside the drying chamber, and the second filter plate is slidably engaged between the limiting plate and the first filter plate. The connecting rod is disposed on the second filter plate and passes through the drying inner liner and the drying box. The connecting rod is fixedly connected to the telescopic end of the hydraulic rod, which is disposed on the drying box. The filtration device can perform preliminary filtration of alumina, preventing larger impurities from entering the electrolytic cell. When it is necessary to pause the delivery of alumina into the electrolytic cell, the overlap of the sieve holes of the first and second filter plates is controlled to pause the delivery of alumina, causing it to fall onto the first drying plate.

[0009] Furthermore, the feature is that the suction and filtration mechanism includes a suction pipe, a fan, and a sieve plate. The drying chamber is provided with the suction pipe communicating with the air supply chamber, the fan is installed inside the suction pipe, and the sieve plate is slidably mounted on the suction pipe. The suction and filtration mechanism can actively draw the hot airflow from the electrolytic cell body into the air supply chamber to heat the drying chamber and the drying inner liner.

[0010] Furthermore, the feeding auxiliary mechanism includes a discharge hopper, a horizontal plate, and a feeding pipe. The discharge hopper is installed on the drying inner liner, and the horizontal plate is fixedly connected to the electrolytic cell body. The feeding pipe is installed on the horizontal plate. Since the discharge hopper is fixedly connected to the drying inner liner, the discharge hopper will also vibrate when the drying inner liner is vibrated. This will affect the feeding from the discharge port, preventing alumina from accurately entering the electrolytic cell body for reaction during the feeding process. The feeding pipe can effectively prevent the problem of alumina not being accurately fed into the electrolytic cell body for preparation when the discharge hopper is vibrating.

[0011] The working principle and beneficial effects of this solution are as follows:

[0012] First, the alumina is conveyed to the second filter plate of the drying chamber. The vibration motor is started to drive the drying box to vibrate between the springs. At this time, the drying chamber will also vibrate. Then, the fan on the suction pipe is started, and the hot air from the electrolytic cell body is drawn into the air supply chamber. As the drying chamber is heated by the hot air from the electrolytic cell body, the drying chamber begins to gradually dry the alumina and remove moisture.

[0013] Because the drying chamber is heated by the hot airflow within the electrolytic cell, the alumina remains in a drying state within it. When the alumina falls onto the first drying plate, the first drying plate dries it. Since the first drying plate has a cross-section that is convex in the middle and concave at both ends, after the alumina falls onto it, a vibrating motor vibrates it from the first discharge port on the first drying plate to the second drying plate. At this point, the second drying plate dries the alumina powder again. Then, the alumina is vibrated and discharged from the second discharge port onto the outlet hopper. The dried alumina is then discharged from the outlet hopper. Then, the dried alumina is precisely fed into the electrolytic cell through the feeding pipe on the horizontal plate for the preparation reaction. Since the first feeding port on the first drying plate and the second feeding port on the second drying plate are not on the same horizontal line, after the alumina falls from the first feeding port at the concave ends of the first drying plate to the second drying plate, the alumina is concentrated again by vibration at the concave middle of the second drying plate before being discharged from the second feeding port to the discharge hopper. This increases the residence time of the alumina in the drying chamber and also increases the residence time on the first and second drying plates, making the alumina dry more thoroughly.

[0014] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0016] Figure 2 Exploded views of the drying mechanism and the suction filter mechanism in the embodiment;

[0017] Figure 3 This is a cross-sectional view of an embodiment;

[0018] Figure 4 This is a magnified view of a portion of point A in the embodiment;

[0019] Figure 5 This is a schematic diagram of the structure of the first drying plate and the second drying plate.

[0020] The following components are labeled in the attached diagram: 1. Electrolytic cell body; 2. Spring; 3. Drying box; 4. Drying inner liner; 5. Flexible connecting belt; 6. Vibration motor; 7. First drying plate; 8. Second drying plate; 9. Airflow guide plate; 10. Drying chamber; 11. Air supply chamber; 12. First discharge port; 13. Second discharge port; 14. First filter plate; 15. Limiting plate; 16. Second filter plate; 17. Connecting rod; 18. Hydraulic rod; 19. Suction pipe; 20. Screen plate; 21. Fan; 22. Horizontal plate; 23. Discharge hopper; 24. Discharge pipe. Detailed Implementation

[0021] The following detailed description illustrates the specific implementation method:

[0022] Example

[0023] like Figures 1 to 5 As shown, an alumina vibration feeding device for an aluminum electrolytic cell is disclosed, including an electrolytic cell body 1, several springs 2, a drying mechanism, two suction and filtration mechanisms, and a feeding auxiliary mechanism. Several springs 2 are arranged on opposite inner sidewalls of the electrolytic cell body 1, and a drying mechanism is arranged between the springs 2. The drying mechanism is used to dry the alumina. Two suction and filtration mechanisms are provided on the drying mechanism, both used to absorb hot airflow inside the electrolytic cell body 1. The feeding auxiliary mechanism is provided on the drying mechanism to assist in feeding the dried alumina into the electrolytic cell body 1. Figure 1 and Figure 2 .

[0024] The drying mechanism includes a drying chamber 3, a drying inner liner 4, a flexible connecting belt 5, a vibration motor 6, a first drying plate 7, a second drying plate 8, several airflow guide plates 9, and a filter device. The drying chamber 3 is fixedly connected between several springs 2 on the inner sidewall of the electrolytic cell body. The drying inner liner 4 is installed inside the drying chamber 3, and the drying inner liner 4 has a drying chamber 10 that penetrates the drying inner liner 4. The upper section of the drying chamber 3 has a rectangular cross-section, and the lower section has a gradually expanding trumpet-shaped opening. An air supply chamber 11 is provided between the drying chamber 3 and the drying inner liner 4. The flexible connecting belt 5 is installed on the drying chamber 3, located between the drying chamber 3 and the electrolytic cell body 1. A vibration motor is installed on the drying chamber. The first drying plate 7 is installed on the drying inner liner 4, located inside the drying chamber 10. The first drying plate 7 is hollow inside, and both ends of the first drying plate 7 are connected to the air supply chamber 11. The first drying plate 7 has a cross-section that is convex in the middle and concave at both ends. Two first discharge ports 12 are opened on the first drying plate 7, located in the concave areas of the first drying plate 7. A second drying plate 8 is installed on the drying chamber 4, located inside the drying cavity 10. The second drying plate 8 is hollow and located below the first drying plate 7. Both ends of the second drying plate 8 are connected to the air supply cavity 11. The cross-section of the second drying plate 8 is concave in the middle and convex on both sides. A second discharge port 13 is opened on the second drying plate 8, located in the concave areas of the second drying plate 8. Several airflow guide plates 9 are installed on the outer wall of the drying chamber 4, located at the points where the first drying plate 7 and the second drying plate 8 connect to the air supply cavity 11. A filter device is installed inside the drying chamber 3 to control the flow rate of alumina on the drying chamber 4. Figure 3 , Figure 4 and Figure 5 As shown.

[0025] The filtration device includes a first filter plate 14, a limiting plate 15, a second filter plate 16, a connecting rod 17, and a hydraulic rod 18. The first filter plate 14 is mounted on the drying inner chamber 4, located inside the drying chamber 10 and above the first drying plate 7. The limiting plate 15 is fixedly connected inside the drying inner chamber 4, positioned above the first filter plate 14. The second filter plate 16 is slidably engaged between the first filter plate 14 and the limiting plate 15. The sieve holes of the second filter plate 16 and the first filter plate 14 are staggered. The connecting rod 17 is mounted on the second filter plate 16. One end of the connecting rod 17 is fixedly connected to the second filter plate 16, and the other end of the connecting rod 17 extends through to the outside of the drying chamber 3 and is fixedly connected to the telescopic end of the hydraulic rod 18. The hydraulic rod 18 is fixedly connected to the outside of the drying chamber 3. Figure 2 As shown.

[0026] The air suction and filtration mechanism includes an air suction pipe 19, a fan 21, and a sieve plate 20. The drying oven 3 is equipped with an air suction pipe 19, which communicates with the air supply chamber 11. A fan 21 is installed inside the air suction pipe 19, and a sieve plate 20 is slidably mounted on the air suction pipe 19. Figure 2 As shown.

[0027] The feeding auxiliary mechanism includes a discharge hopper 23, a horizontal plate 22, and a feeding pipe 24. The discharge hopper 23 is fixedly connected to the lower end of the drying inner liner 4, and the discharge hopper 23 communicates with the drying chamber 10. A horizontal plate 22 is installed inside the electrolytic cell body 1, and a feeding pipe 24 is fixedly connected to the horizontal plate 22, penetrating the horizontal plate 22. Figure 3 As shown.

[0028] In practice

[0029] When alumina needs to be placed into the electrolytic cell body 1 for preparation, the alumina is first transported to the second filter plate 16 of the drying inner liner 4. At this time, the vibration motor 6 is started to drive the drying box 3 to vibrate between the springs 2. The flexible connecting belt 5 can prevent the vibration of the drying box 3 from being affected and can also prevent the hot airflow inside the electrolytic cell body 1 from being dissipated. When the drying box 3 starts to vibrate, it will drive the drying inner liner 4 to vibrate. At this time, the fan 21 on the suction pipe 19 is started. The fan 21 draws the hot airflow inside the electrolytic cell body 1 into the air supply chamber 11 and then discharges it through the suction pipe 19. The sieve plate 20 in the suction pipe 19 can prevent the fan 21 from drawing up impurities inside the electrolytic cell body 1. After the alumina is placed into the drying inner liner 4, the drying inner liner 4 is heated by the hot airflow inside the electrolytic cell body 1, and the drying inner liner 4 begins to gradually dry the alumina and remove moisture.

[0030] When fan 21 starts working, the heat emitted from inside the electrolytic cell body 1 heats the drying inner liner 4 and drying chamber 3 through the air supply chamber 11, and then is discharged from the suction pipe 19. The airflow guide plate 9 can actively guide the hot airflow in the air supply chamber 10 into the first drying plate 7 and the second drying plate 8, heating the first drying plate 7 and the second drying plate 8 through the hot airflow. At this time, the hydraulic rod 18 on the drying chamber 3 is activated, and the hydraulic rod 18 drives the connecting rod 17 to move. The connecting rod 17 drives the second filter plate 16 on the first filter plate 14 to move. Since the initial state of the sieve holes of the first filter plate 14 and the second filter plate 16 is staggered, oxygen is released at this time. Alumina will not fall through the first filter plate 14 and the second filter plate 16. When the hydraulic rod 18 moves the connecting rod 17, the connecting rod 17 moves the second filter plate 16. At this time, the screen holes on the second filter plate 16 gradually overlap with the screen holes on the first filter plate 14. Then, the alumina in the drying inner liner 4 will fall through the screen holes on the first filter plate 14 and the second filter plate 16. The limiting plate 15 limits and fixes the second filter plate 16. The hydraulic rod 18 moves the second filter plate 16 to adjust the size of the overlapping area of ​​the screen holes on the first filter plate 14 and the second filter plate 16, thereby controlling the flow rate of falling alumina.

[0031] Because the drying inner liner 4 is heated by the hot airflow inside the electrolytic cell body 1, the alumina is constantly being dried inside the drying inner liner 4. When the alumina falls onto the first drying plate 7, since the first drying plate 7 is connected to the air supply chamber 11, the hot airflow inside the electrolytic cell body 1 will also heat the first drying inner plate. Because the cross-section of the first drying plate 7 is convex in the middle and concave at both ends, after the alumina falls onto the first drying plate 7, the first drying plate 7 dries the alumina. At this time, since the vibration motor 6 is working, the first drying plate 7 in the drying inner liner 4 is also vibrating. The alumina on the first drying plate 7 will be vibrated and fall from the first discharge port 12 on the first drying plate 7 onto the second drying plate 8. Since the second drying plate 8 is connected to the air supply chamber 11, the hot airflow inside the electrolytic cell body 1 will also heat the first drying inner plate. The dry chamber 10 is connected, and the second drying plate 8 is also heated by the hot air flow. At this time, the second drying plate 8 dries the alumina powder again. Then, the alumina is vibrated and discharged from the second discharge port 13 onto the discharge hopper 23. The dried alumina is discharged from the discharge hopper 23 and then accurately fed into the electrolytic cell body 1 through the discharge pipe 24 on the horizontal plate 22 for preparation reaction. Since the first discharge port 12 on the first drying plate 7 and the second discharge port 13 on the second drying plate 8 are not on the same horizontal line, the time when the alumina falls from the first discharge port 12 onto the second drying plate 8 and then is discharged from the second discharge port 13 will be extended. This increases the residence time of the alumina in the drying chamber 4, making the alumina dry more thoroughly.

[0032] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics in the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or its practicality.

Claims

1. An alumina vibrating feeding device for an aluminum electrolytic cell, characterized in that: The device includes an electrolytic cell body, several springs, a drying mechanism, two suction and filtration mechanisms, and a feeding auxiliary mechanism. Several springs are fixedly connected to the two inner sidewalls of the electrolytic cell body. A drying mechanism for drying alumina is arranged between the springs. Two suction and filtration mechanisms are provided on the drying mechanism for absorbing hot airflow inside the electrolytic cell body. A feeding auxiliary mechanism is provided on the drying mechanism for feeding alumina into the electrolytic cell body.

2. The alumina vibrating feeding device for an aluminum electrolytic cell according to claim 1, characterized in that: The drying mechanism includes a drying chamber, a drying inner liner, a flexible connecting belt, a vibration motor, a first drying plate, a second drying plate, and a filter device. The drying chamber is fixedly connected between several springs on the inner sidewall of the electrolytic cell body. The drying inner liner is provided inside the drying chamber, and the drying inner liner has a drying cavity extending through its upper and lower ends. An air supply cavity is provided between the drying chamber and the drying inner liner. The flexible connecting belt is provided between the drying chamber and the electrolytic cell body. The vibration motor is provided on the drying chamber. The first drying plate and the second drying plate are provided inside the drying cavity. The first drying plate and the second drying plate are both hollow and communicate with the air supply cavity. The second drying plate is located below the first drying plate. The first drying plate has two first discharge ports, and the second drying plate has a second discharge port. The filter device for controlling the falling speed of alumina is provided inside the drying chamber.

3. The alumina vibrating feeding device for an aluminum electrolytic cell according to claim 2, characterized in that: The filtration device includes a first filter plate, a limiting plate, a second filter plate, a connecting rod, and a hydraulic rod. The first filter plate is disposed inside the drying chamber and is located above the first drying plate. The limiting plate is disposed inside the drying chamber, and the second filter plate is slidably engaged between the limiting plate and the first filter plate. The connecting rod is disposed on the second filter plate and passes through the drying inner liner and the drying box. The connecting rod is fixedly connected to the telescopic end of the hydraulic rod, and the hydraulic rod is disposed on the drying box.

4. The alumina vibrating feeding device for an aluminum electrolytic cell according to claim 3, characterized in that: The air suction and filtration mechanism includes an air suction pipe, a fan, and a sieve plate. The drying box is provided with an air suction pipe that communicates with the air supply chamber. The fan is installed inside the air suction pipe, and the sieve plate is slidably mounted on the air suction pipe.

5. The alumina vibrating feeding device for an aluminum electrolytic cell according to claim 4, characterized in that: The feeding auxiliary mechanism includes a discharge hopper, a horizontal plate, and a feeding pipe. The discharge hopper is provided on the drying inner liner, the horizontal plate is fixedly connected to the electrolytic cell body, and the feeding pipe is provided on the horizontal plate.

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