Cathode liquor full-process circulation electrolytic manganese system

Abstract

The utility model discloses a catholyte full-flow circulation electrolytic manganese system, which belongs to the technical field of hydrometallurgy and comprises an electrolytic bath, a cathode plate, an anode plate, a conductive copper bar, a diaphragm bag, a catholyte circulating tank, a catholyte circulating pump and a catholyte head tank, the conductive copper bar is arranged at the top end of the electrolytic bath, and the cathode plate and the anode plate are mounted on the conductive copper bar at intervals. The cathode plate and the anode plate extend into the electrolyte; the diaphragm bag sleeves the cathode plate inside to form a cathode region, an anode region is formed around the anode plate, and the cathode region, the catholyte circulating tank, the catholyte circulating pump, the catholyte elevated tank and the cathode region are sequentially communicated to form a catholyte circulating path. In the manganese electrolysis process, catholyte can be circulated in the whole process, the problems that the liquidity of liquid in the cathode area is poor, the concentration polarization phenomenon is prone to occurring and the like are effectively solved, the liquidity of the liquid in the cathode area can be improved, the tank temperature can be better controlled, and the device is suitable for large-scale production.

Description

Technical Field

[0001] This utility model belongs to the field of hydrometallurgical technology, and in particular relates to a cathode liquid full-process circulating electrolytic manganese system. Background Technology

[0002] Currently, in the manganese electrolysis process, manganese metal deposition occurs in the cathode region. This region contains a diaphragm frame, diaphragm bag, and cathode plate, with a relatively small electrode distance (67-75 mm). This results in poor liquid flow in the cathode region, making concentration polarization prone to occur, thus hindering heat dissipation within the electrolytic cell. Furthermore, concentration polarization must be avoided during manganese electrolysis. This is primarily because concentration polarization leads to excessively low manganese ion concentration near the cathode plate, causing a decrease in the hydrogen evolution potential near the cathode plate. This results in other metal cations in the electrolyte, such as copper, cobalt, and nickel, gaining electrons and depositing, which not only affects the quality of the manganese product but also the current efficiency of manganese electrolysis.

[0003] It is worth noting that in electrolytic manganese production, the cell temperature has a significant impact on the conductivity of the electrolyte. At a constant voltage, excessively low cell temperature leads to a decrease in electrolyte conductivity, increasing electrolysis costs. Conversely, excessively high cell temperature causes the overpotential of hydrogen to decrease with increasing temperature, reducing current efficiency and impacting the overall efficiency of manganese electrolysis. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a full-process circulating electrolytic manganese system for cathode liquid to solve the above-mentioned existing technical problems, increase the fluidity of the liquid in the cathode area of ​​the electrolytic cell, better control the cell temperature, and achieve a significant improvement in electrolytic manganese efficiency and large-scale production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A catholyte circulating electrolytic manganese system includes: an electrolytic cell, cathode plates, anode plates, conductive copper busbars, diaphragm bags, a catholyte circulation tank, a catholyte circulation pump, and a catholyte high-level tank. The conductive copper busbars are located at the top of the electrolytic cell. Multiple cathode plates and anode plates are vertically spaced on the conductive copper busbars, extending into the electrolyte of the electrolytic cell. Multiple diaphragm bags are respectively located at the bottom of the conductive copper busbars. The diaphragm bags enclose the cathode plates to form cathode areas, and the anode plates are surrounded to form anode areas. The diaphragm bags are provided with cathode outlets. The catholyte in the multiple cathode areas is connected to the catholyte circulation tank pipeline through the cathode outlets. The cathode areas, the catholyte circulation tank, the catholyte circulation pump, the catholyte high-level tank, and the cathode areas are sequentially connected to form a catholyte circulation path.

[0007] Furthermore, it also includes a new liquid buffer tank, which is connected to the pipeline of the electrolytic cell.

[0008] Furthermore, it also includes an anolyte storage tank, and an anolyte outlet is provided on the side wall of the electrolytic cell. The anode area is connected to the anolyte storage tank through the anolyte outlet via a pipeline.

[0009] Furthermore, it also includes a circulating tank cooler, which is disposed in the cathode liquid circulating tank and is used to cool the cathode liquid in the cathode liquid circulating tank.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. In this utility model, the cathode area, cathode liquid circulation tank, cathode liquid circulation pump, cathode liquid high-level tank and cathode area are connected in sequence to form a cathode liquid circulation path, which can realize the recycling of cathode liquid. The cathode liquid is cooled by the circulation tank cooler, thereby improving the temperature of the electrolytic cell, which is conducive to the large-scale production of electrolysis.

[0012] 2. Through the circulation of the cathode liquid, the output of a single plate increases accordingly. When the flow rate of the new electrolyte is 1.5L / min and the circulation rate of the cathode liquid is 0.9L / min, compared with the circulation path without cathode liquid, the output of a single plate increases from 4.1 to 4.33kg / plate.

[0013] 3. Through the circulation of the cathode liquid, the current efficiency is greatly improved. When the fresh electrolyte is 1.5L / min and the cathode liquid circulation rate is 0.9L / min, the current efficiency increases from 93.3% to 97.6% compared with the circulation path without cathode liquid.

[0014] 4. Through the circulation of the cathode liquid, the plate loading rate is effectively improved. When the fresh electrolyte is 1.5 L / min and the cathode liquid circulation rate is 0.9 L / min, compared with the circulation path without cathode liquid, the plate loading rate increases from 0.17 to 0.186 Kg / h.

[0015] This invention has a simple structure and is easy to operate. In particular, it can separate the catholyte for separate recycling, thereby reducing the difficulty of subsequent treatment, reducing the amount of waste liquid discharged, and reducing costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a cathode liquid full-process circulating electrolytic manganese system.

[0018] In the figure:

[0019] 1-Electrolytic cell, 2-Anode plate, 3-Cathode plate, 4-Conductive copper busbar, 5-Diaphragm bag, 6-Anode liquid outlet, 7-Cathode liquid outlet, 8-New liquid buffer tank, 9-Cathode liquid high-level tank, 10-Anode liquid storage tank, 11-Cathode liquid circulation tank, 12-Circulation tank cooler, 13-Cathode liquid circulation pump, 14-Anode area, 15-Cathode area. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] See attached document Figure 1 As shown, this utility model provides a full-process circulating manganese electrolysis system for cathode liquid, including: an electrolytic cell 1, a cathode plate 3, an anode plate 2, a conductive copper busbar 4, diaphragm bags 5, a cathode liquid circulation tank 11, a cathode liquid circulation pump 13, and a cathode liquid high-level tank 9. The conductive copper busbar 4 is set at the top of the electrolytic cell 1. Multiple cathode plates 3 and anode plates 2 are vertically spaced on the conductive copper busbar 4, and the cathode plates 3 and anode plates 2 extend into the electrolyte of the electrolytic cell 1. Multiple diaphragm bags 5 are respectively set at the bottom of the conductive copper busbar 4. The diaphragm bags 5 enclose the cathode plates 3 to form cathode areas 15, and the anode plates 2 are surrounded to form anode areas 14. The diaphragm bags 5 are provided with cathode outlets 7. The cathode liquid in the multiple cathode areas 15 is connected to the cathode liquid circulation tank 11 through the cathode outlets 7. The cathode areas 15, the cathode liquid circulation tank 11, the cathode liquid circulation pump 13, the cathode liquid high-level tank 9, and the cathode areas 15 are sequentially connected to form a cathode liquid circulation path. Specifically, the circulation direction of the catholyte is: cathode zone 15 - catholyte circulation tank 11 - catholyte circulation pump 13 - catholyte high-level tank 9 - cathode zone 15.

[0022] In a preferred embodiment, a catholyte full-process circulating manganese electrolysis system further includes a fresh electrolyte buffer tank 8, which is connected to the electrolysis cell 1 via pipeline. The fresh electrolyte buffer tank 8 continuously provides fresh electrolyte to the electrolysis cell 1. The electrolyte enters the electrolysis cell 1 from the fresh electrolyte buffer tank 8. During the manganese electrolysis process, the catholyte generated in the cathode zone 15 circulates in the catholyte circulation system of "cathode zone 15 - catholyte circulation tank 11 - catholyte circulation pump 13 - catholyte high-level tank 9 - cathode zone 15".

[0023] In a preferred embodiment, a cathode liquid full-process circulating manganese electrolysis system further includes an anolyte storage tank 10. An anolyte outlet 6 is provided on the side wall of the electrolytic cell 1, and the anode zone 14 is connected to the anolyte storage tank 10 via the anolyte outlet 6. Electrolyte enters the electrolytic cell 1 from the fresh liquid buffer tank 8. During the manganese electrolysis process, the anolyte generated in the anode zone 14 enters the anolyte storage tank 10 from the anolyte outlet 6 on the side wall of the electrolytic cell 1.

[0024] In a preferred embodiment, a cathode liquid full-process circulating electrolytic manganese system further includes a circulating tank cooler 12. The circulating tank cooler 12 is disposed in the cathode liquid circulating tank 11. The circulating tank cooler 12 is provided with a coolant inlet and a cooling water outlet. Cooling water enters the circulating tank cooler 12 through the cooling water inlet, absorbs the heat of the cathode liquid, and then flows out from the cooling water outlet, thereby cooling the cathode liquid in the cathode liquid circulating tank 11. The circulating tank cooler 12 can better control the tank temperature and can significantly improve the electrolytic manganese efficiency.

[0025] Example

[0026] This utility model provides a cathode liquid full-process circulating electrolytic manganese system, the process steps of which are as follows:

[0027] Step 1: Adjust the flow rate of the new solution buffer tank 8 to 1.5 L / min. Adjust the concentration and pH of each substance in the electrolyte. The concentration of manganese ions in the original solution is 38.8 g / L, the concentration of ammonium sulfate is 77.3 g / L, the pH value is 6.8, and the concentration of selenium dioxide is 0.038 g / L.

[0028] Step 2: Adjust the concentration, temperature and pH of each substance in electrolytic cell 1, where the manganese ion concentration is 16.8 g / L, the temperature of electrolytic cell 1 is 41 degrees Celsius and the pH is 7.8.

[0029] Step 3: Adjust the concentrations of each substance in the anolyte storage tank 10, with manganese ion concentration at 16.2 g / L, hydrogen ion concentration at 40.8 g / L, and ammonium sulfate concentration at 76.2 g / L;

[0030] Step 4: Adjust the catholyte circulation pump 13 outside the catholyte circulation tank 11 and set the circulation parameter to 0.9 L / min;

[0031] Step 5: Obtain the electrolytic manganese product, and simultaneously measure the current, single plate weight, electrolysis cycle, plate loading rate, and recovery rate.

[0032] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cathode liquid full-process circulating electrolytic manganese system, characterized in that, include: The electrolytic cell (1), cathode plate (3), anode plate (2), conductive copper busbar (4), diaphragm bag (5), cathode liquid circulation tank (11), cathode liquid circulation pump (13), and cathode liquid high-level tank (9) are provided. The conductive copper busbar (4) is located at the top of the electrolytic cell (1). Multiple cathode plates (3) and anode plates (2) are vertically spaced on the conductive copper busbar (4). The cathode plates (3) and anode plates (2) extend into the electrolyte of the electrolytic cell (1). Multiple diaphragm bags (5) are respectively located at the bottom of the conductive copper busbar (4). The diaphragm bag (5) encloses the cathode plate (3) to form a cathode area (15), and the anode plate (2) is surrounded to form an anode area (14). The diaphragm bag (5) is provided with a cathode outlet (7). The cathodic liquid in multiple cathode areas (15) is connected to the cathodic liquid circulation tank (11) through the cathode outlet (7). The cathode area (15), the cathodic liquid circulation tank (11), the cathodic liquid circulation pump (13), the cathodic liquid high-level tank (9) and the cathode area (15) are connected in sequence to form a cathodic liquid circulation path.

2. The cathode liquid full-process circulating electrolytic manganese system according to claim 1, characterized in that, It also includes a new liquid buffer tank (8), which is connected to the electrolytic cell (1) via pipeline.

3. The cathode liquid full-process circulating electrolytic manganese system according to claim 1, characterized in that, It also includes an anolyte storage tank (10), and an anolyte outlet (6) is provided on the side wall of the electrolytic cell (1). The anode area (14) is connected to the anolyte storage tank (10) through the anolyte outlet (6).

4. The cathode liquid full-process circulating electrolytic manganese system according to claim 1, characterized in that, It also includes a circulating tank cooler (12), which is disposed in the cathode liquid circulating tank (11) for cooling the cathode liquid in the cathode liquid circulating tank (11).

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