A magnesium electrolytic bipolar cell flow line

Abstract

The application provides a magnesium electrolysis bipolar tank flow line. The application is composed of a head tank, a bipolar refining electrolysis tank, a bipolar flow line electrolysis tank, an intermediate tank and a tail tank in series, the head tank is located at the front end of the flow line, the tail tank is located at the end of the flow line, the intermediate tank is arranged every 5-8 electrolysis tanks, the tanks are connected by a chute, bypass chutes are arranged in the tanks except the head tank and the tail tank, and a high-temperature melt pump is arranged in the tail tank; when the magnesium electrolysis bipolar tank flow line is running, the head tank is used for adding melt magnesium chloride and other components of electrolyte, the intermediate tank is used for collecting magnesium, discharging magnesium and adding melt magnesium chloride, the tail tank is used for collecting magnesium and discharging magnesium, and the high-temperature melt pump is used for conveying the electrolyte in the tail tank to the head tank, and each tank on the flow line can discharge slag. By using the application, the number of magnesium electrolysis tanks can be reduced under the condition of the same magnesium production capacity, and the magnesium chloride feeding frequency and the magnesium discharging frequency of the magnesium electrolysis production line can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnesium electrolysis, in particular to a magnesium electrolysis bipolar cell flow line. BACKGROUND

[0002] The magnesium electrolysis technology currently used in industry generally includes magnesium electrolysis multi-pole cell technology and magnesium electrolysis flow line technology. The magnesium electrolysis multi-pole cell technology adopts a single cell operation mode. When the number of electrolytic cells is large, the frequency of adding magnesium chloride and the frequency of discharging magnesium are high, and the production logistics organization is difficult. In addition, because the multi-pole cell is not provided with a slag outlet, the service life of the electrolytic cell is limited. The magnesium electrolysis flow line has a low magnesium production capacity of a single cell. The concentration of magnesium chloride in the electrolyte of each electrolytic cell along the flow line is quite different, which limits the number of electrolytic cells in the flow line. Therefore, it is necessary to combine the advantages of the magnesium electrolysis multi-pole cell technology and the magnesium electrolysis flow line technology and make improvements. SUMMARY

[0003] In view of the above technical problems, a magnesium electrolysis bipolar cell flow line is provided. The technical means adopted by the present application is as follows:

[0004] A magnesium electrolysis bipolar cell flow line comprises a head cell, bipolar refining electrolytic cells, bipolar flow line electrolytic cells, an intermediate cell and a tail cell. Each cell is connected through a chute. After being connected in series, they form a magnesium electrolysis flow line. The head cell is located at the front end of the flow line, and the tail cell is located at the end of the flow line. A plurality of groups of bipolar refining electrolytic cells and bipolar flow line electrolytic cells are arranged between the head cell and the tail cell. The intermediate cell is arranged after a preset number of bipolar refining electrolytic cells and bipolar flow line electrolytic cells. The head cell is used for adding molten magnesium chloride and other components of the electrolyte. The bipolar refining electrolytic cells are used for refining the electrolyte and electrolyzing magnesium chloride. The bipolar flow line electrolytic cells are used for electrolyzing magnesium chloride. The intermediate cell is used for collecting magnesium, discharging magnesium and adding magnesium chloride melt. The tail cell is used for collecting magnesium and discharging magnesium. The chute is used for electrolyte melt flow.

[0005] Further, a bypass chute is arranged on the chute connected to each cell except the connection between the head cell and the tail cell. The bypass chute is used as an auxiliary electrolyte melt flow under a preset condition.

[0006] Further, the head cell is divided into two chambers. One chamber is a charging chamber for adding raw materials, and the other chamber is a refining chamber. One group of graphite electrodes with a total direct current intensity of 15-20 kA is installed in each chamber. 1-2 groups of alternating current heating electrodes are arranged at the bottom of the two chambers of the head cell. The refining chamber is provided with a slag outlet.

[0007] Further, 1-2 bipolar refining electrolytic cells are arranged after the head cell. The two sides of the bipolar refining electrolytic cell are electrolytic chambers, and the middle is a magnesium collecting chamber. The graphite electrode is inserted into the bipolar refining electrolytic cell from the cover of the bipolar refining electrolytic cell. The magnesium collecting chamber is provided with a slag cover plate.

[0008] Further, the bipolar flow line electrolytic cell is arranged after the bipolar refining electrolytic cell, the number is 3-6, the two sides of the bipolar flow line electrolytic cell are electrolytic chambers, the middle is a magnesium collecting chamber, the graphite electrode is inserted into the bipolar flow line electrolytic cell from the bottom of the side of the bipolar flow line electrolytic cell, the magnesium collecting chamber is provided with a slag discharge cover plate, and the number of the whole magnesium electrolysis flow line arranged with the bipolar flow line electrolytic cell is 20-30.

[0009] Further, when the number of the bipolar refining electrolytic cell and the bipolar flow line electrolytic cell reaches 5-8, an intermediate tank is arranged at the end of the bipolar flow line electrolytic cell, the intermediate tanks are symmetrically arranged on both sides of the whole flow line, and one intermediate tank is arranged in the middle of the flow line, 2 groups of alternating current heating electrodes are arranged at the bottom of the intermediate tank, and the intermediate tank is provided with a slag discharge port.

[0010] Further, 1 bipolar refining electrolytic cell and 4-7 bipolar flow line electrolytic cells are sequentially arranged after the first intermediate tank, and the number of the electrolytic cells on both sides of the magnesium electrolysis flow line is equal and symmetrically arranged.

[0011] Further, the tail tank and the head tank are connected by a high-temperature melt pump, a melt pipeline and a melt channel, the tail tank is divided into two chambers, one chamber is a magnesium collecting chamber for collecting magnesium and discharging magnesium, and the other chamber is a circulating chamber, the high-temperature melt pump is arranged in the second chamber, 1-2 groups of alternating current heating electrodes are arranged at the bottom of the two chambers of the tail tank, the two chambers of the tail tank are provided with slag discharge ports, and the electrolyte in the second chamber of the tail tank is transported by the high-temperature melt pump to the melt pipeline and then flows through the melt channel into the first chamber of the head tank.

[0012] Further, two graphite electrode thin plates are arranged between the graphite electrode plate and the steel cathode plate of the bipolar refining electrolytic cell and the bipolar flow line electrolytic cell, and the graphite electrode thin plates are not connected to the power supply; the direct current intensity for electrolysis of the magnesium electrolysis flow line is set to 180-260 kA, the temperature of the electrolyte in the head tank is controlled to 670-720 DEG C during operation, and the temperature of the electrolyte in the bipolar refining electrolytic cell, the bipolar flow line electrolytic cell and the intermediate tank is controlled to 670-685 DEG C.

[0013] Further, when the magnesium electrolysis flow line is operated, the amount of magnesium chloride melt added into the head tank accounts for 50-60% of the total amount of magnesium chloride melt added into the flow line, the total amount of magnesium chloride melt added into each intermediate tank accounts for 40-50% of the total amount of magnesium chloride melt added into the flow line, and the amount of magnesium chloride melt added into each intermediate tank is approximately equal.

[0014] The magnesium electrolysis flow line technology and the magnesium electrolysis multi-pole tank technology are combined, the advantages of the magnesium electrolysis flow line technology and the magnesium electrolysis multi-pole tank technology are combined, and the disadvantages of the magnesium electrolysis flow line technology and the magnesium electrolysis multi-pole tank technology are removed, so that the number of magnesium electrolytic cells is reduced under the same magnesium production capacity, and the frequency of adding magnesium chloride and discharging magnesium of the magnesium electrolysis production line is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required by the embodiments or prior art description. Obviously, the drawings described below are only some embodiments of the present application, and the other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0016] Figure 1 A flow line schematic diagram of the magnesium electrolysis bipolar cell of the present application.

[0017] In the figure: 1 - head tank, 2 - bipolar refining electrolysis cell, 3 - bipolar flow line electrolysis cell, 4 - intermediate tank, 5 - spout, 6 - tail tank, 7 - high-temperature melt pump, 8 - melt pipeline, 9 - melt passage, 10 - bypass spout. DETAILED DESCRIPTION

[0018] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0019] As Figure 1 shown, the embodiments of the present application disclose a magnesium electrolysis bipolar cell flow line, which comprises a head tank 1, a bipolar refining electrolysis cell 2, a bipolar flow line electrolysis cell 3, an intermediate tank 4 and a tail tank 6. The tanks are connected by spouts 5, and are connected in series to form a magnesium electrolysis flow line. The head tank is located at the front end of the flow line, and the tail tank is located at the end of the flow line. A plurality of bipolar refining electrolysis cells and bipolar flow line electrolysis cells are arranged between the head tank and the tail tank. The intermediate tank is arranged after a preset number of bipolar refining electrolysis cells and bipolar flow line electrolysis cells. The head tank is used for adding melt magnesium chloride and other components of electrolyte. The bipolar refining electrolysis cell is used for refining electrolyte and electrolyzing magnesium chloride. The bipolar flow line electrolysis cell is used for electrolyzing magnesium chloride. The intermediate tank is used for collecting magnesium, discharging magnesium and supplementing magnesium chloride melt. The tail tank is used for collecting magnesium and discharging magnesium. The spout is used for electrolyte melt flow.

[0020] In addition to the connection between the head tank and the tail tank, bypass spouts 10 are arranged on the spouts connected to each tank. The bypass spout is used as an auxiliary electrolyte melt flow under a preset condition, and is specifically used for operating the bypass spout when the bipolar refining electrolysis cell, the bipolar flow line electrolysis cell, the intermediate tank and the spout fail or are under maintenance.

[0021] The head tank is divided into two chambers, one chamber is a charging chamber for adding raw materials, and the other chamber is a refining chamber, and a set of graphite electrodes with a total direct current intensity of 15-20 kA is installed in each chamber, 1-2 sets of alternating current heating electrodes are arranged at the bottom of the two chambers of the head tank, a slag outlet is arranged in the refining chamber, and the outlet of the refining chamber is connected with the downstream bipolar refining electrolytic tank.

[0022] 1-2 bipolar refining electrolytic tanks are arranged after the head tank, the two sides of the bipolar refining electrolytic tank are electrolytic chambers, and the middle is a magnesium collecting chamber, the two ends of the magnesium collecting chamber of each electrolytic tank are connected with the runner, the graphite electrode is inserted into the bipolar refining electrolytic tank from the cover of the bipolar refining electrolytic tank, and a slag cover plate is arranged in the magnesium collecting chamber.

[0023] The number of the bipolar flow line electrolytic tanks arranged after the bipolar refining electrolytic tank is 3-6, the two sides of the bipolar flow line electrolytic tank are electrolytic chambers, and the middle is a magnesium collecting chamber, the graphite electrode is inserted into the bipolar flow line electrolytic tank from the bottom of the side of the bipolar flow line electrolytic tank, a slag cover plate is arranged in the magnesium collecting chamber, and the number of the entire magnesium electrolysis flow line is 20-30.

[0024] When the number of the bipolar refining electrolytic tank and the bipolar flow line electrolytic tank reaches 5-8, an intermediate tank is arranged at the end of the bipolar flow line electrolytic tank, the intermediate tanks are symmetrically arranged on both sides of the flow line, an intermediate tank is arranged in the middle of the flow line, 2 sets of alternating current heating electrodes are arranged at the bottom of the intermediate tank, and a slag outlet is arranged in the intermediate tank.

[0025] 1 bipolar refining electrolytic tank and 4-7 bipolar flow line electrolytic tanks are sequentially arranged after the first intermediate tank, and the number of the electrolytic tanks on both sides of the magnesium electrolysis flow line is equal and symmetrically arranged.

[0026] The tail tank is connected with the head tank by a high-temperature melt pump 7, a melt pipeline 8 and a melt channel 9, the tail tank is divided into two chambers, one chamber is a magnesium collecting chamber for collecting magnesium and discharging magnesium, and the other chamber is a circulating chamber, the high-temperature melt pump is arranged in the second chamber, 1-2 sets of alternating current heating electrodes are arranged at the bottom of the two chambers of the tail tank, slag outlets are arranged in the two chambers of the tail tank, and the electrolyte in the two chambers of the tail tank is transported by the high-temperature melt pump to the melt pipeline and then flows through the melt channel into the chamber of the head tank.

[0027] Two graphite electrode thin plates are arranged between the graphite electrode plate and the steel cathode plate of the bipolar refining electrolytic tank and the bipolar flow line electrolytic tank, and the graphite electrode thin plate is not connected to the power supply; the direct current intensity for electrolysis of the magnesium electrolysis flow line is set to 180-260 kA, the temperature of the electrolyte in the head tank is controlled to 670-720 DEG C during operation, and the temperature of the electrolyte in the bipolar refining electrolytic tank, the bipolar flow line electrolytic tank and the intermediate tank can not be completely consistent, but all need to be controlled to 670-685 DEG C.

[0028] The magnesium electrolysis flow line is operated with the amount of magnesium chloride melt added into the head tank accounting for 50-60% of the total amount of magnesium chloride melt added into the flow line, the amount of magnesium chloride melt added into each of the intermediate tanks accounting for 40-50% of the total amount of magnesium chloride melt added into the flow line, and the amount of magnesium chloride melt added into each of the intermediate tanks being approximately equal.

[0029] Example 1

[0030] In this example, two bipolar refining electrolytic tanks are arranged after the head tank, four bipolar flow line electrolytic tanks are arranged after the two bipolar refining electrolytic tanks, then one intermediate tank, then one bipolar refining electrolytic tank, five bipolar flow line electrolytic tanks, then one intermediate tank is arranged at the middle position of the entire flow line, then one bipolar refining electrolytic tank, five bipolar flow line electrolytic tanks, one intermediate tank, one bipolar refining electrolytic tank, five bipolar flow line electrolytic tanks are arranged in sequence on the other side of the flow line of the aforementioned 12 electrolytic tanks, and finally one tail tank.

[0031] The magnesium electrolysis flow line is operated with the amount of magnesium chloride melt added into the head tank accounting for 60% of the total amount of magnesium chloride melt added into the flow line, and the amount of magnesium chloride melt added into each of the three intermediate tanks accounting for 13-14% of the total amount of magnesium chloride melt added into the flow line. Compared with a magnesium electrolysis flow line with the same 24 electrolytic tanks, the electrolytic magnesium production is increased by 80%; compared with 24 magnesium electrolysis bipolar tanks operated independently, the frequency of adding magnesium chloride is reduced by 25%, and the frequency of discharging magnesium is reduced by 50%.

[0032] Example 2

[0033] In this example, two bipolar refining electrolytic tanks are arranged after the head tank, four bipolar flow line electrolytic tanks are arranged after the two bipolar refining electrolytic tanks, then one intermediate tank, then one bipolar refining electrolytic tank, five bipolar flow line electrolytic tanks, then one intermediate tank is arranged at the middle position of the entire flow line, then one bipolar refining electrolytic tank, five bipolar flow line electrolytic tanks, one intermediate tank, one bipolar refining electrolytic tank, five bipolar flow line electrolytic tanks are arranged in sequence on the other side of the flow line of the aforementioned 12 electrolytic tanks, and finally one tail tank.

[0034] The magnesium electrolysis flow line is operated with the amount of magnesium chloride melt added into the head tank accounting for 60% of the total amount of magnesium chloride melt added into the flow line, and the amount of magnesium chloride melt added into each of the three intermediate tanks accounting for 13-14% of the total amount of magnesium chloride melt added into the flow line. Compared with a magnesium electrolysis flow line with the same 24 electrolytic tanks, the electrolytic magnesium production is increased by 80%; compared with 24 magnesium electrolysis bipolar tanks operated independently, the frequency of adding magnesium chloride is reduced by 25%, and the frequency of discharging magnesium is reduced by 50%.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A magnesium electrolysis bipolar cell flow line characterized in that, The application relates to a magnesium electrolysis flow line, which comprises a head tank, bipolar refining electrolysis tanks, bipolar flow line electrolysis tanks, intermediate tanks and a tail tank, and is connected through a chute. When the number of the bipolar refining electrolysis tanks and the bipolar flow line electrolysis tanks reaches 5-8, one intermediate tank is arranged behind the bipolar flow line electrolysis tank at the end, the intermediate tanks are symmetrically arranged on both sides of the flow line, one intermediate tank is arranged in the middle of the flow line, and two groups of alternating current heating electrodes are arranged at the bottom of the intermediate tank. The head tank is divided into two chambers, one is a charging chamber for adding raw materials, and the other is a refining chamber, and one group of graphite electrodes with a total direct current intensity of 15-20 kA is arranged in each chamber; and 1-2 groups of alternating current heating electrodes are arranged at the bottom of each chamber.

2. The magnesium electrolysis bipolar cell flow line of claim 1, wherein, Except for the connection between the head tank and the tail tank, bypass chutes are arranged on the chutes connected with each tank, and the bypass chutes are used as auxiliary electrolyte melt flow channels under preset conditions.

3. The magnesium electrolysis bipolar cell flow line of claim 1, wherein, The refining chamber is provided with a slag outlet.

4. The magnesium electrolysis bipolar cell flow line of claim 1, wherein, 1-2 bipolar refining electrolysis tanks are arranged behind the head tank, electrolysis chambers are arranged on both sides of the bipolar refining electrolysis tank, a magnesium collecting chamber is arranged in the middle, graphite electrodes are inserted into the bipolar refining electrolysis tank from the cover of the bipolar refining electrolysis tank, and a slag cover plate is arranged in the magnesium collecting chamber.

5. The magnesium electrolysis bipolar cell trough pipeline of claim 4, wherein, The bipolar flow line electrolysis tank is arranged behind the bipolar refining electrolysis tank, the number of the bipolar flow line electrolysis tanks is 3-6, electrolysis chambers are arranged on both sides of the bipolar flow line electrolysis tank, a magnesium collecting chamber is arranged in the middle, graphite electrodes are inserted into the bipolar flow line electrolysis tank from the bottom of the side of the bipolar flow line electrolysis tank, a slag cover plate is arranged in the magnesium collecting chamber, and the number of the bipolar flow line electrolysis tanks arranged in the magnesium electrolysis flow line is 20-30.

6. The magnesium electrolysis bipolar cell trough pipeline of claim 1, wherein, The intermediate tank is provided with a slag outlet.

7. The magnesium electrolysis cell according to claim 6, wherein, 1 bipolar refining electrolysis tank and 4-7 bipolar flow line electrolysis tanks are sequentially arranged behind the first intermediate tank, and the number of the electrolysis tanks arranged on both sides of the magnesium electrolysis flow line is equal and symmetric.

8. The magnesium electrolysis bipolar cell trough pipeline of claim 1, wherein, The tail tank is connected with the head tank through a high-temperature melt pump, a melt pipeline and a melt channel, the tail tank is divided into two chambers, one is a magnesium collecting chamber for collecting magnesium and discharging magnesium, and the other is a circulating chamber, the high-temperature melt pump is arranged in the circulating chamber, 1-2 groups of alternating current heating electrodes are arranged at the bottom of each chamber of the tail tank, each chamber of the tail tank is provided with a slag outlet, and the electrolyte in the circulating chamber of the tail tank is transported to the melt pipeline by the high-temperature melt pump and then flows through the melt channel into one chamber of the head tank.

9. The magnesium electrolysis cell flow line of any one of claims 3-5, wherein, The bipolar refining electrolytic cell, the graphite electrode plate and the steel cathode plate of the bipolar pipeline electrolytic cell are provided with two graphite electrode thin plates, and the graphite electrode thin plates are not connected to the power supply; the direct current intensity of the magnesium electrolysis pipeline for electrolysis is set to 180-260 kA, the electrolyte temperature in the head tank is controlled to 670-720 DEG C during operation, and the electrolyte temperatures in the bipolar refining electrolytic cell, the bipolar pipeline electrolytic cell and the intermediate tank are all controlled to 670-685 DEG C.

10. The magnesium electrolysis bipolar cell trough pipeline of claim 1, wherein, The magnesium electrolysis pipeline is operated, and the amount of the magnesium chloride melt added in the head tank accounts for 50-60% of the total amount of the magnesium chloride melt added in the pipeline, the total amount of the magnesium chloride melt added in the intermediate tanks accounts for 40-50% of the total amount of the magnesium chloride melt added in the pipeline, and the amounts of the magnesium chloride melt added in the intermediate tanks are equal.

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