A device for regulating a manganese sulfate solution in an electrolytic cell

Abstract

The utility model provides a kind of manganese sulfate solution adjusting device in electrolytic cell, comprising: electrolytic cell, buffer pool, transfer pool, sedimentation tank, the lower part of the buffer pool is connected with electrolytic cell side by first conveying pump, electrolytic cell other side is equipped with overflow pipe, overflow pipe is communicated with electrolytic cell by first connecting pipe, overflow pipe upper end is lower than the liquid level height in electrolytic cell, and overflow pipe upper part is equipped with overflow tank.The utility model is circulated between the manganese sulfate solution in electrolytic cell and buffer pool by first conveying pump by being equipped with buffer pool, to keep the concentration distribution of manganese sulfate solution in electrolytic cell uniform, by being equipped with on-line densimeter in buffer pool, using the principle that the density of manganese sulfate solution is also low when the concentration of manganese sulfate solution reduces, the concentration of manganese sulfate solution is detected, when lower than threshold value, higher concentration manganese sulfate solution can be supplemented, so that the manganese sulfate solution in electrolytic cell is kept in reasonable interval, and electrolytic efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of electrolytic manganese dioxide technology, and in particular to a device for adjusting manganese sulfate solution in an electrolytic cell. Background Technology

[0002] Manganese dioxide is an important raw material for battery production. Electrolytic manganese dioxide is one of the main production methods. The main process involves feeding sulfuric acid, manganese powder, and other raw materials into a sedimentation tank for reaction, followed by neutralization and filtration. After aging in a transfer tank, a manganese sulfate solution is obtained for electrolysis. Following electrolysis in an electrolytic cell, high-purity manganese dioxide adheres to the anode plate. Subsequent peeling and grinding yields high-purity manganese dioxide powder. During electrolysis, as manganese ions are converted to manganese dioxide, the concentration of the manganese sulfate solution in the electrolytic cell continuously decreases. Furthermore, the concentration of manganese sulfate near the anode plate is lower than at other locations in the cell, leading to a slower accumulation rate of manganese dioxide and increased energy consumption. Therefore, a manganese sulfate solution regulating device is needed in the electrolytic cell. This device should maintain a slow flow of the solution, improving the uniformity of the manganese sulfate concentration distribution. The concentration of the manganese sulfate solution should be automatically adjusted by detecting density, thereby improving electrolysis efficiency. Utility Model Content

[0003] To address the aforementioned problems, this invention proposes a manganese sulfate solution adjustment device for an electrolytic cell. This device allows the solution in the electrolytic cell to flow slowly, improving the uniformity of manganese sulfate concentration distribution. Furthermore, it detects the concentration of the manganese sulfate solution by measuring density and automatically adjusts the concentration to improve electrolysis efficiency.

[0004] This utility model is achieved through the following technical solution:

[0005] This utility model proposes a manganese sulfate solution adjustment device in an electrolytic cell, comprising: an electrolytic cell, a buffer tank, a transfer tank, and a sedimentation tank. The lower part of the buffer tank is connected to one side of the electrolytic cell via a first delivery pump. An overflow pipe is provided on the other side of the electrolytic cell, and the overflow pipe is connected to the electrolytic cell via a first connecting pipe. The upper end of the overflow pipe is lower than the liquid level in the electrolytic cell, and an overflow trough is provided on the upper part of the overflow pipe. The upper part of the overflow pipe extends vertically into the overflow trough, and the overflow trough is connected to the buffer tank via a return pipe. The buffer tank is connected to the sedimentation tank via a second delivery pump, and the transfer tank is connected to the buffer tank via a second connecting pipe.

[0006] Furthermore, the vertical height of the buffer tank is lower than that of the electrolytic cell, and the vertical height of the transfer tank is higher than that of the buffer tank.

[0007] Furthermore, the first delivery pump is connected to the electrolytic cell via a third connecting pipe, and the third connecting pipe is provided with a bend, the vertical height of which is higher than that of the electrolytic cell.

[0008] Furthermore, an online density meter is provided in the middle of the buffer pool, and a level gauge and a stirrer are provided in the upper part of the buffer pool, with the stirring paddle of the stirrer extending to the bottom of the buffer pool.

[0009] Furthermore, the overflow pipe is connected to the electrolytic cell through multiple first connecting pipes, and the uppermost first connecting pipe is 20cm to 30cm lower than the upper end of the overflow pipe.

[0010] Furthermore, the bottom of the electrolytic cell is connected to the reflux pipe via a fourth connecting pipe, and a first valve is provided on the fourth connecting pipe, and a second valve is provided on the second connecting pipe, and the second valve is an electric valve.

[0011] The beneficial effects of this invention are as follows: By setting up a buffer tank, the manganese sulfate solution in the electrolytic cell is circulated between the buffer tank and the first delivery pump to maintain a uniform concentration distribution of the manganese sulfate solution in the electrolytic cell. By setting up an online density meter in the buffer tank, the density of the manganese sulfate solution decreases as the concentration of the manganese sulfate solution decreases, and the concentration of the manganese sulfate solution is detected. When it is below the threshold, a higher concentration of manganese sulfate solution can be added, thereby keeping the manganese sulfate solution in the electrolytic cell within a reasonable range and improving the electrolysis efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the structure of the electrolytic cell of this utility model;

[0014] In the diagram: 1-Electrolytic cell, 2-Buffer tank, 3-Transfer tank, 4-Sedimentation tank, 5-First transfer pump, 6-Overflow pipe, 7-First connecting pipe, 8-Overflow trough, 9-Return pipe, 10-Second transfer pump, 11-Second connecting pipe, 12-Third connecting pipe, 13-Bend, 14-Online density meter, 15-Level gauge, 16-Agitator, 17-Fourth connecting pipe, 18-First valve, 19-Second valve. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Throughout the description, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0016] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0017] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include at least one of the stated features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0018] like Figure 1 , Figure 2 As shown, an embodiment of this utility model provides a manganese sulfate solution adjustment device in an electrolytic cell, including: an electrolytic cell 1, a buffer tank 2, a transfer tank 3, and a sedimentation tank 4. The lower part of the buffer tank 2 is connected to one side of the electrolytic cell 1 through a first delivery pump 5. An overflow pipe 6 is provided on the other side of the electrolytic cell 1. The overflow pipe 6 is connected to the electrolytic cell 1 through a first connecting pipe 7. The upper end of the overflow pipe 6 is lower than the liquid level in the electrolytic cell 1, and an overflow trough 8 is provided on the upper part of the overflow pipe 6. The upper part of the overflow pipe 6 extends vertically into the overflow trough 8, and the overflow trough 8 is connected to the buffer tank 2 through a return pipe 9. The buffer tank 2 is connected to the sedimentation tank 4 through a second delivery pump 10, and the transfer tank 3 is connected to the buffer tank 2 through a second connecting pipe 11.

[0019] Manganese powder and sulfuric acid react in sedimentation tank 4 to obtain a manganese sulfate solution with many impurities. After neutralization and fine filtration, a higher purity manganese sulfate solution is obtained and stored in transfer tank 3. The concentration of manganese sulfate in transfer tank 3 is 120 to 130 g / L, and the density is about 1.1 g / cm3. During electrolysis, the manganese sulfate in transfer tank 3 is sent to electrolytic cell 1 and buffer tank 2 through pipelines. During electrolysis, the first transfer pump 5 starts to send the manganese sulfate solution in buffer tank 2 to one side of electrolytic cell 1, while the excess manganese sulfate solution flows out from the overflow pipe 6 on the other side of electrolytic cell 1, then enters the overflow tank 8, and flows back to buffer tank 2, so that the manganese sulfate solution in electrolytic cell 1 is in a slow circulation state, which improves the uniformity of the concentration of manganese sulfate solution in electrolytic cell 1. Electrolysis of manganese sulfate solution yields sulfuric acid, manganese dioxide, and hydrogen. As the electrolysis reaction proceeds, manganese dioxide continuously adheres to the electrolytic plates, causing the concentration of manganese sulfate and the density of the electrolyte to decrease. An online density meter 14 is installed in buffer tank 2 to monitor the concentration of the solution online. For example, when the density of the solution in buffer tank 2 is detected to be below 1.05 g / cm³, half of the solution in buffer tank 2 is pumped out by the second transfer pump 10 and sent to sedimentation tank 4 for reuse. Then, by opening the second valve 19, a high-concentration manganese sulfate solution from transfer tank 3 is added to buffer tank 2, stirred evenly, and then transported to electrolytic cell 1 to increase the manganese ion content and ensure that the manganese sulfate in electrolytic cell 1 is within a suitable range, thus ensuring the production efficiency of electrolytic manganese dioxide. Furthermore, the entire control process can be controlled by a PLC program, improving automation and reducing manual labor and the probability of human error.

[0020] Preferably, the vertical height of the buffer tank 2 is lower than that of the electrolytic cell 1, so that the overflowing solution can flow back into the buffer tank 2 by gravity to achieve circulation. The vertical height of the transfer tank 3 is higher than that of the buffer tank 2. After the second valve 19 is opened, the manganese sulfate solution in the transfer tank 3 can flow into the buffer tank 2 by gravity to replenish the manganese sulfate solution in the buffer tank 2.

[0021] In a preferred embodiment, the first delivery pump 5 is connected to the electrolytic cell 1 via the third connecting pipe 12. The third connecting pipe 12 is provided with a bend 13, the vertical height of which is higher than that of the electrolytic cell 1. This ensures that when the first delivery pump 5 stops working, the manganese sulfate solution in the electrolytic cell 1 cannot flow back directly to the buffer tank 2 through the bend 13, thus maintaining the liquid level in the electrolytic cell 1.

[0022] Specifically, an online density meter 14 is installed in the middle of buffer tank 2, and a level gauge 15 and a stirrer 16 are installed at the top of buffer tank 2. The stirring paddle of the stirrer 16 extends to the bottom of buffer tank 2. The online density meter 14 is a commercially available online density meter, preferably a corrosion-resistant model. The corrosion-resistant material is 316L or Hastelloy C22, which is not easily corroded even when the solution is acidic, ensuring the normal operation of the equipment. The online density meter 14 quickly obtains the density of the solution in buffer tank 2 and sets a threshold. When the density is lower than the threshold, the operation of replenishing manganese sulfate solution can be initiated, thereby ensuring that the manganese sulfate in electrolytic cell 1 is within a reasonable range. The level gauge 15 and the stirrer 16 also use commercially available products with mature technology. The level gauge 15 is used to detect the liquid level in buffer tank 2, and can automatically determine the liquid level when draining and replenishing the solution in buffer tank 2. The stirrer 16 can quickly and uniformly homogenize the concentration of the solution in buffer tank 2.

[0023] Preferably, the overflow pipe 6 is connected to the electrolytic cell 1 through multiple first connecting pipes 7, and the uppermost first connecting pipe 7 is 20cm to 30cm lower than the upper end of the overflow pipe 6. During overflow and electrolysis, the temperature of the manganese sulfate solution needs to be maintained at around 95°C. In order to prevent heat loss, a certain thickness of foam is usually generated on the liquid surface to play a role in heat preservation. The uppermost first connecting pipe 7 is 20cm to 30cm lower than the upper end of the overflow pipe 6 so that the solution 20cm to 30cm below the liquid surface overflows, reducing the loss of foam due to overflow.

[0024] Specifically, the bottom of the electrolytic cell 1 is connected to the return pipe 9 via a fourth connecting pipe 17, and a first valve 18 is provided on the fourth connecting pipe 17. When it is necessary to empty the electrolytic cell 1, it can be emptied through the fourth connecting pipe 17. A second valve 19 is provided on the second connecting pipe 11, and the second valve 19 is an electric valve that can be automatically started under PLC control to realize the operation of replenishing manganese sulfate solution in the buffer tank 2.

[0025] Of course, there may be other implementations of this utility model. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model.

Claims

1. A device for adjusting manganese sulfate solution in an electrolytic cell, characterized in that, include: An electrolytic cell (1), a buffer tank (2), a transfer tank (3), and a sedimentation tank (4) are provided. The lower part of the buffer tank (2) is connected to one side of the electrolytic cell (1) through a first delivery pump (5). An overflow pipe (6) is provided on the other side of the electrolytic cell (1). The overflow pipe (6) is connected to the electrolytic cell (1) through a first connecting pipe (7). The upper end of the overflow pipe (6) is lower than the liquid level in the electrolytic cell (1). An overflow trough (8) is provided on the upper part of the overflow pipe (6). The upper part of the overflow pipe (6) extends vertically into the overflow trough (8). The overflow trough (8) is connected to the buffer tank (2) through a return pipe (9). The buffer tank (2) is connected to the sedimentation tank (4) through a second delivery pump (10). The transfer tank (3) is connected to the buffer tank (2) through a second connecting pipe (11).

2. The manganese sulfate solution adjustment device in an electrolytic cell according to claim 1, characterized in that, The vertical height of the buffer tank (2) is lower than that of the electrolytic cell (1), and the vertical height of the transfer tank (3) is higher than that of the buffer tank (2).

3. The manganese sulfate solution adjustment device in an electrolytic cell according to claim 2, characterized in that, The first delivery pump (5) is connected to the electrolytic cell (1) through the third connecting pipe (12). The third connecting pipe (12) is provided with a bend (13), and the vertical height of the bend (13) is higher than that of the electrolytic cell (1).

4. The manganese sulfate solution adjustment device in an electrolytic cell according to claim 1, characterized in that, The buffer pool (2) is equipped with an online density meter (14) in the middle, and a level gauge (15) and a stirrer (16) are provided at the top of the buffer pool (2). The stirring paddle of the stirrer (16) extends to the bottom of the buffer pool (2).

5. The manganese sulfate solution adjustment device in an electrolytic cell according to claim 1, characterized in that, The overflow pipe (6) is connected to the electrolytic cell (1) through multiple first connecting pipes (7), and the uppermost first connecting pipe (7) is 20cm to 30cm lower than the upper end of the overflow pipe (6).

6. The manganese sulfate solution adjustment device in an electrolytic cell according to claim 1, characterized in that, The bottom of the electrolytic cell (1) is connected to the return pipe (9) through the fourth connecting pipe (17), and the fourth connecting pipe (17) is provided with a first valve (18), and the second connecting pipe (11) is provided with a second valve (19), and the second valve (19) is an electric valve.

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