A kind of production method of sodium tetrachloroaluminate

Abstract

The present invention provides a method for producing sodium tetrachloroaluminate, and relates to the technical field of chemical synthesis, in order to solve the problem that the newly introduced nitrogen has not been subjected to temperature treatment, and as the nitrogen is introduced and discharged, the heat in the reaction system is lost as the nitrogen flows. The method for producing sodium tetrachloroaluminate comprises: adding raw materials into a reaction tank; when a shutoff air inlet pipeline connected to the reaction tank is controlled to be in a conducting state, and a shutoff exhaust pipeline connected to the reaction tank is in a closed state, an inert gas is introduced into the reaction tank; when the pressure in the reaction tank reaches a preset value, the shutoff air inlet pipeline connected to the reaction tank is controlled to be in a closed state; heating the raw materials in the reaction tank to obtain a semi-finished product; transferring the semi-finished product into a settling tank; adding aluminum foil into the settling tank containing the semi-finished product, introducing an inert gas and keeping it still to obtain sodium tetrachloroaluminate; transferring the sodium tetrachloroaluminate into a storage tank into which the inert gas is introduced.

Description

Technical Field

[0001] The invention relates to the technical field of chemical synthesis, in particular to a production method of sodium tetrachloroaluminate. Background Art

[0002] At present, the method for producing sodium tetrachloroaluminate is generally to mix anhydrous aluminum chloride, anhydrous sodium chloride and metallic aluminum, add them into a reaction tank and pass high-purity nitrogen for heating. After all materials are liquefied, open the top cover of the reaction tank, cover the top cover of the reaction tank after continuous stirring, and continue to keep warm. After the reaction is completed, the supernatant in the reaction tank is transferred to a storage tank.

[0003] However, in the process of producing sodium tetrachloroaluminate, high-purity nitrogen is continuously introduced into the reaction tank containing the raw materials and the nitrogen is continuously discharged. Since the newly introduced high-purity nitrogen has not been subjected to temperature treatment, the heat in the reaction system is lost as the nitrogen is introduced and discharged. Summary of the invention

[0004] The object of the present invention is to provide a method for producing sodium tetrachloroaluminate, which is used to reduce the loss of heat in a reaction system.

[0005] In order to achieve the above-mentioned purpose, in the first aspect, the present invention provides a method for producing sodium tetrachloroaluminate. The method for producing sodium tetrachloroaluminate uses a sodium tetrachloroaluminate production system including a reaction tank, a settling tank, a storage tank, a plurality of shutoff air intake pipelines, a plurality of shutoff exhaust pipelines, and a plurality of shutoff material pipelines. The plurality of shutoff air intake pipelines are respectively connected to the reaction tank, the settling tank, and the storage tank; the plurality of shutoff exhaust pipelines are respectively connected to the reaction tank, the settling tank, and the storage tank; the reaction tank and the settling tank are connected through a first shutoff material pipeline; the settling tank and the storage tank are connected through a second shutoff material pipeline; and one end of the third shutoff material pipeline is connected to the storage tank.

[0006] The production method of above-mentioned sodium tetrachloroaluminate comprises:

[0007] First, raw materials are added into a reaction tank, the raw materials including anhydrous aluminum chloride and sodium chloride;

[0008] Next, when the shutoff air inlet line connected to the reaction tank is controlled to be in an on state and the shutoff exhaust line connected to the reaction tank is controlled to be in a closed state, an inert gas is introduced into the reaction tank;

[0009] Next, when the pressure in the reaction tank reaches a preset value, the shutoff air inlet pipeline connected to the reaction tank is controlled to be in a closed state;

[0010] Next, the raw materials in the reaction tank are heated to obtain a semi-finished product;

[0011] Next, the semi-finished product is transferred to a settling tank;

[0012] Next, the aluminum foil is added into the sedimentation tank containing the semi-finished product, an inert gas is introduced and the tank is kept still to obtain sodium tetrachloroaluminate;

[0013] Next, the sodium tetrachloroaluminate is transferred to a storage tank filled with inert gas.

[0014] Compared with the prior art, in the production method of sodium tetrachloroaluminate provided by the present invention, when the shutoff air inlet pipeline connected to the reactor is controlled to be in a conducting state and the shutoff exhaust pipeline connected to the reactor is in a closed state, an inert gas is introduced into the reactor. Next, when the pressure in the reactor reaches a preset value, the shutoff air inlet pipeline connected to the reactor is controlled to be in a closed state. Next, the raw materials in the reactor are heated to obtain a semi-finished product. As can be seen from the above, after the inert gas is introduced into the reactor to form a positive pressure, the shutoff air inlet pipeline connected to the reactor is closed, so that the subsequent heating treatment of the raw materials in the reactor is carried out under positive pressure, and the inert gas is no longer continuously introduced. In this process, the inert gas in the reactor increases in temperature due to the heating treatment of the raw materials to meet the production needs of sodium tetrachloroaluminate. Since the inert gas is no longer continuously introduced into the reactor, no inert gas that has not been subjected to the temperature increase treatment enters the reactor. At this time, the situation that the temperature in the reactor is lowered due to the newly introduced inert gas that has not been heated can be reduced or avoided, so as to reduce the loss of heat in the reaction system. Further, when the pressure in the reactor reaches the preset value, the shutoff air inlet pipeline connected to the reactor is controlled to be in a closed state; and when the inert gas is introduced, the shutoff exhaust pipeline connected to the reactor is in a closed state, so it can be seen that when the pressure in the reactor reaches the preset value, the reactor is in a closed state. Therefore, the inert gas after heating will not be discharged from the reactor, and at this time, it can not only avoid the heat in the reactor from being lost with the discharge of the inert gas, but also further reduce the loss of heat in the reaction system. At the same time, it can also avoid the phenomenon that the sublimation of anhydrous aluminum chloride due to the discharge of inert gas escapes with the discharge of inert gas, so as to reduce the loss of raw materials, and reduce or eliminate the number of times the escaped aluminum chloride is absorbed by alkali solution, so as to reduce production costs. Further, since there is no need to continuously introduce inert gas, inert gas can be saved to further reduce production costs.

[0015] In one implementation, before adding the raw materials into the reaction tank, the production method of sodium tetrachloroaluminate further comprises:

[0016] When the shutoff air inlet pipeline connected to the reaction tank, the first shutoff material pipeline, the second shutoff material pipeline, and the shutoff exhaust pipeline connected to the storage tank are all in a conducting state, an inert gas is introduced into the reaction tank and the reaction tank is heated; wherein the temperature of heating the reaction tank is greater than or equal to 100° C. and less than or equal to 140° C.; the flow rate of the inert gas is greater than or equal to 400 ml / min and less than or equal to 1000 ml / min;

[0017] When the time for heating the reaction tank is equal to the preset time, stop introducing the inert gas into the reaction tank and control the shutoff air inlet line connected to the reaction tank, the first shutoff material line, the second shutoff material line, and the shutoff exhaust line connected to the storage tank to be in a closed state; the preset time is greater than or equal to 90 minutes and less than or equal to 150 minutes.

[0018] In one implementation, heating the raw material in the reaction tank to obtain a semi-finished product includes:

[0019] Heating the raw material in the reaction tank to obtain molten raw material; heating the raw material to a temperature greater than or equal to 170° C. and less than or equal to 190° C.; heating the raw material for a time greater than or equal to 2 hours and less than or equal to 4 hours;

[0020] The molten raw material in the reaction tank is heated and stirred to obtain a semi-finished product; the temperature of heating the molten raw material is greater than or equal to 190° C. and less than or equal to 210° C.; the time of heating and stirring the molten raw material is greater than or equal to 4 hours and less than or equal to 6 hours.

[0021] In one implementation, transferring the semi-finished product into the settling tank includes:

[0022] When the shutoff exhaust pipeline connected to the settling tank and the first shutoff material pipeline are controlled to be in an on state, the semi-finished product is transferred into the settling tank under the action of the gas pressure of the inert gas.

[0023] In one implementation, when the sodium tetrachloroaluminate production system includes two settling tanks, transferring the semi-finished product into the settling tanks includes:

[0024] Control the shutoff exhaust pipeline connected to the first settling tank and the shutoff material pipeline connected to the reaction tank and the first settling tank to be in an on state, and the shutoff material pipeline connected to the reaction tank and the second settling tank and the shutoff exhaust pipeline connected to the reaction tank to be in a closed state, so as to transfer part of the semi-finished product to the first settling tank;

[0025] After part of the semi-finished product is transferred to the first settling tank, the shutoff material pipeline connected to the reaction tank and the second settling tank is controlled to be in an on state, and the shutoff material pipeline connected to the reaction tank and the first settling tank is controlled to be in a closed state, so as to transfer the remaining part of the semi-finished product to the second settling tank;

[0026] The time for the semi-finished product to settle in the first settling tank is not equal to the time for the semi-finished product to settle in the second settling tank.

[0027] In one implementation, the mass ratio of the anhydrous aluminum chloride to the sodium chloride is greater than or equal to 1:0.46 and less than or equal to 1:0.5;

[0028] And / or, the preset value is greater than or equal to 0.04 MPa and less than or equal to 0.2 MPa;

[0029] And / or, the mass of the aluminum foil is greater than or equal to 0.3 kg and less than or equal to 0.4 kg.

[0030] In one implementation, after the semi-finished product is transferred to the settling tank, the method for producing sodium tetrachloroaluminate further comprises: when the liquid level of the semi-finished product in the settling tank reaches a preset value, stopping the transfer of the semi-finished product to the settling tank;

[0031] Adding aluminum foil into the settling tank containing the semi-finished product, introducing inert gas and keeping it still to obtain sodium tetrachloroaluminate comprises:

[0032] adding the aluminum foil into the settling tank containing the semi-finished product;

[0033] When the first shutoff material pipeline is controlled to be in a closed state and the shutoff exhaust pipeline connected to the settling tank is in an on state, the shutoff air intake pipeline connected to the settling tank is in an on state, so as to continuously introduce inert gas into the settling tank and keep it stationary;

[0034] The temperature in the settling tank is set to be greater than or equal to 210° C. and less than or equal to 230° C., and the semi-finished product and the aluminum foil are heated to obtain sodium tetrachloroaluminate; the heating time of the semi-finished product and the aluminum foil is greater than or equal to 48 hours and less than or equal to 60 hours.

[0035] In one implementation, transferring the sodium tetrachloroaluminate to the storage tank into which the inert gas is introduced comprises:

[0036] When the second shutoff material pipeline, the shutoff exhaust pipeline connected to the storage tank, and the shutoff air intake pipeline connected to the settling tank are controlled to be in a conducting state, and the shutoff exhaust pipeline connected to the settling tank is in a closed state, an inert gas is introduced into the settling tank through the shutoff air intake pipeline connected to the settling tank, so that the sodium tetrachloroaluminate is transferred to the storage tank under the action of the gas pressure of the inert gas.

[0037] In one implementation, the sodium tetrachloroaluminate production system further includes: a reaction tank connected to the reaction tank having a shutoff waste discharge pipeline and a settling tank connected to the settling tank having a shutoff waste discharge pipeline;

[0038] After the sodium tetrachloroaluminate is transferred to the storage tank into which the inert gas is passed, the production method of sodium tetrachloroaluminate further comprises:

[0039] Controlling the reaction tank to shut off the waste discharge pipeline to be in a conducting state, and collecting the residue and residual liquid in the reaction tank;

[0040] Controlling the settling tank to shut off the waste discharge pipeline in a conducting state, and collecting the residue and residual liquid in the settling tank;

[0041] The residue and residual liquid in the reaction tank and the residue and residual liquid in the settling tank are transferred into the settling tank.

[0042] In a second aspect, the present invention also provides a production system of sodium tetrachloroaluminate. The production system of sodium tetrachloroaluminate comprises: a reaction tank, a settling tank, a storage tank, a plurality of shutoff air inlet pipelines, a plurality of shutoff exhaust pipelines and a plurality of shutoff material pipelines. The plurality of shutoff air inlet pipelines are respectively connected to the reaction tank, the settling tank and the storage tank. The plurality of shutoff exhaust pipelines are respectively connected to the reaction tank, the settling tank and the storage tank. The reaction tank and the settling tank are connected through a first shutoff material pipeline, the settling tank and the storage tank are connected through a second shutoff material pipeline, and one end of the third shutoff material pipeline is connected to the storage tank; the material of the reaction tank is stainless steel; and / or the material of the settling tank is aluminum; and / or the material of the storage tank is aluminum.

[0043] Compared with the prior art, compared with the reaction tank and / or the settling tank and / or the storage tank made of glass material, not only can the production scale be expanded, but also the probability of damage to the reaction tank and / or the settling tank and / or the storage tank can be reduced, and the safety of the production process can be improved. Further, compared with the reaction tank and / or the settling tank and / or the storage tank made of nickel material, the production cost of the reaction tank and / or the settling tank and / or the storage tank can be reduced, thereby reducing the production cost of sodium tetrachloroaluminate. Further, Cr and Ni make stainless steel generate a very dense oxide film in an oxidizing medium, so that the stainless steel is passivated. Since the radius of the chloride ion is small and the penetration ability is strong, it is most likely to penetrate the extremely small pores in the oxide film, reach the metal surface and interact with the metal to form chlorides, so that the structure of the oxide film changes, and then the stainless steel is corroded and iron ions are released. Since aluminum chloride, sodium chloride and sodium tetrachloroaluminate exist in a free state in a molten state, they will corrode the stainless steel and release iron ions. In the present invention, since the material of the settling tank is aluminum, and / or the material of the storage tank is aluminum, aluminum can be used to replace iron, and at this time, not only the content of iron ions in the finished product (i.e., sodium tetrachloroaluminate) can be reduced, but also the situation that the liquid or solid sodium tetrachloroaluminate turns black due to the presence of iron ions can be reduced or avoided. In other words, when the iron ion content is reduced, the liquid sodium tetrachloroaluminate is clear and transparent, and the solid sodium tetrachloroaluminate is pure white, based on which the quality of the sodium tetrachloroaluminate can be improved. It should be noted that nickel ions will also be released at the same time, but at a low content, and the same as the principle of iron ions, will be replaced by aluminum. In addition, since aluminum itself is the raw material for synthesizing sodium tetrachloroaluminate, the settling tank made of aluminum material will not introduce new impurity ions compared to the settling tank made of other materials, and the quality of the sodium tetrachloroaluminate finally obtained can be further improved.

[0044] In one implementation, the reaction tank comprises:

[0045] A cover body, wherein the cover body is provided with a feeding port, a reaction tank discharge port, a reaction tank air inlet, and a reaction tank exhaust port; one end of the first shutoff material pipeline is connected to the reaction tank discharge port; the reaction tank air inlet is connected to the corresponding shutoff air inlet pipeline, and the reaction tank exhaust port is connected to the corresponding shutoff exhaust pipeline;

[0046] A reaction tank body, wherein the cover body is sealed and connected to the reaction tank body; the reaction tank body comprises a first cylinder, a second cylinder and a third cylinder which are sequentially arranged from the inside to the outside; the second cylinder is arranged on at least part of the outer wall of the first cylinder, and there is a receiving space between the first cylinder and the second cylinder, and the receiving space is used to receive a heat-conducting liquid; the third cylinder is at least arranged on at least part of the outer wall of the second cylinder;

[0047] A driving structure, disposed on the cover body;

[0048] A stirring structure, one end of which is connected to the driving structure, and the driving structure is used to drive the stirring structure to rotate; the other end of the stirring structure is located in the first cylinder;

[0049] A first heating structure, located in the containing space, for heating the heat-conducting liquid;

[0050] A first temperature sensor is arranged on the inner wall of the first cylinder; along the direction from the cover to the reaction tank body, the third cylinder and the first temperature sensor are spaced apart; the first temperature sensor is used to detect the temperature of the material in the reaction tank;

[0051] The second temperature sensor is arranged on the inner wall of the second cylinder; the second temperature sensor is used to detect the temperature of the heat-conducting liquid.

[0052] In one implementation, the reaction tank further comprises:

[0053] A fixing member is arranged on the outer wall of the cover body; the stirring structure passes through the fixing member, and the stirring structure is rotatably connected to the fixing member;

[0054] A sealing member, at least a portion of which is located inside the fixing member and is disposed between the stirring structure and the fixing member; the sealing member is used to seal the cover body;

[0055] The first heat-insulating structure is arranged between the second cylinder and the third cylinder; along the direction from the cover to the reaction tank body, the third cylinder and the second temperature sensor are distributed at intervals.

[0056] In one implementation, the settling tank comprises:

[0057] A settling tank body, wherein the settling tank body is provided with a settling tank air inlet, a settling tank exhaust port, a settling tank feed port, a settling tank discharge port, a settling tank feeding port and a first temperature measuring sleeve interface; the settling tank air inlet is connected to the corresponding said shutoff air inlet pipeline, and the settling tank exhaust port is connected to the corresponding said shutoff exhaust pipeline; the settling tank feed port is connected to the other end of the first said shutoff material pipeline, and the settling tank discharge port is connected to one end of the second said shutoff material pipeline; the first temperature measuring sleeve interface is used for installing a third temperature sensor, and the third temperature sensor is used for detecting the temperature of the material in the settling tank;

[0058] A second heating structure, wherein the second heating structure is disposed on at least part of the outer side wall of the settling tank body;

[0059] The second heat-insulating structure covers the second heating structure and the outer side wall of the settling tank body.

[0060] In one implementation, the storage tank comprises:

[0061] A storage tank body, wherein the storage tank body is provided with a storage tank air inlet, a storage tank exhaust port, a storage tank feed port, a storage tank discharge port, a second temperature measuring sleeve interface and a potentiometer sleeve; the storage tank air inlet is communicated with the corresponding shutoff air inlet pipeline, and the storage tank exhaust port is communicated with the corresponding shutoff exhaust pipeline; the storage tank feed port is communicated with the other end of the second shutoff material pipeline, and the storage tank discharge port is communicated with one end of the third shutoff material pipeline; the second temperature measuring sleeve interface is used for installing a fourth temperature sensor, and the fourth temperature sensor is used for detecting the temperature of the storage tank; the potentiometer sleeve is used for installing a potentiometer;

[0062] A third thermal insulation structure, covering the outer side wall of the storage tank body;

[0063] The third heating structure is arranged on the outer side wall of the third heat preservation structure.

[0064] In one implementation, the sodium tetrachloroaluminate production system further includes: a reaction tank connected to the reaction tank having a shutoff waste discharge pipeline and a settling tank connected to the settling tank having a shutoff waste discharge pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0066] Figure 1 This is a schematic diagram of the structure of a production system of sodium tetrachloroaluminate in an embodiment of the present invention;

[0067] Figure 2 A top view of a reaction tank in an embodiment of the present invention;

[0068] Figure 3 A cross-sectional view of a reaction tank in an embodiment of the present invention;

[0069] Figure 4 A cross-sectional view of a settling tank in an embodiment of the present invention;

[0070] Figure 5 In the embodiment of the present invention Figure 4 A schematic diagram of the structure enlargement at the center A;

[0071] Figure 6 A top view of a settling tank in an embodiment of the present invention;

[0072] Figure 7 It is a partial cross-sectional view of a storage tank in an embodiment of the present invention.

[0073] Reference numerals:

[0074] 1-reaction tank, 10-cover, 100-feeding port, 101-reaction tank discharge port, 102-reaction tank air inlet, 103-reaction tank exhaust port, 104-viewing mirror, 105-first pressure gauge interface, 106-oil inlet; 11-reaction tank body, 110-first cylinder, 111-second cylinder, 112-third cylinder, 113-accommodating space, 114-oil discharge port, 115-reaction tank waste discharge port; 12-driving structure, 120-driving motor, 121-reducer, 122-motor seat; 13-stirring structure, 130-stirring shaft, 131-stirring paddle; 14-first heating structure, 15-first temperature sensor, 16-second temperature sensor, 17-inner cover, 18-outer cover, 190-insulating cotton, 191-fixing member, 192-sealing member, 193-first insulation structure, 194-support ear; 2-sedimentation tank, 20-sedimentation tank body, 200-sedimentation tank air inlet, 201-sedimentation tank exhaust port, 202-sedimentation tank feed port, 203-sedimentation tank discharge port, 204-first temperature measuring sleeve interface, 205-second pressure gauge interface, 206-sedimentation tank waste outlet, 20 7-sedimentation tank feeding port, 21-second heating structure, 22-second insulation structure, 23-leg, 24-pulley; 3-storage tank, 30-storage tank body, 300-storage tank air inlet, 301-storage tank exhaust port, 302-storage tank feeding port, 303-storage tank discharge port, 304-second temperature measuring sleeve interface, 305-potentiometer sleeve, 31-third insulation structure, 32-third heating structure; 4-shut-off air inlet pipeline, 40-inlet valve, 41-inlet pipeline; 5-shut-off exhaust pipeline, 50-exhaust valve, 51-exhaust pipeline; 60-the first shut-off material pipeline, 61-the second shut-off material pipeline, 62-the third shut-off material pipeline, 63-feed valve, 64-discharge valve, 65-material pipeline; 7-shut-off waste discharge pipeline of reaction tank, 70-waste discharge pipeline of reaction tank, 71-first valve, 8-shut-off waste discharge pipeline of sedimentation tank, 80-waste discharge pipeline of sedimentation tank, 81-second valve, 90-main air intake pipeline, 91-main exhaust pipeline, 92-automatic temperature control switch of reaction tank, 93-automatic temperature control switch of sedimentation tank, 94-automatic temperature control switch of storage tank. DETAILED DESCRIPTION

[0075] In order to clearly describe the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, words such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and effects. For example, the first threshold and the second threshold are only used to distinguish different thresholds, and their order is not limited. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit them to be different.

[0076] It should be noted that, in the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0077] In the present invention, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b and c, where a, b, c can be single or multiple.

[0078] In addition to the contents described in the background technology section, the prior art also has the following technical problems:

[0079] The production of sodium tetrachloroaluminate requires equipment to be temperature-resistant and corrosion-resistant, which is not easy to meet with equipment made of ordinary materials, and it is easy to introduce new impurity ions and contaminate the product. The laboratory synthesis of sodium tetrachloroaluminate uses glass reaction equipment, which cannot be expanded for large-scale production.

[0080] In addition, the production equipment of sodium tetrachloroaluminate in the prior art is all nickel equipment. The method of using nickel production equipment to actually produce sodium tetrachloroaluminate is: high-purity aluminum is melted at high temperature, and then high-purity chlorine is introduced to generate high-purity aluminum trichloride steam. The steam is then introduced into a container of high-purity sodium chloride, and it is allowed to contact and react. After that, the product is cooled, heated and melted again, and excess sodium chloride is filtered out, thereby obtaining high-purity sodium tetrachloroaluminate. It can be seen from the synthesis process that the synthesis procedure is very complicated, and the environmental protection measures need to be very demanding, and the melting aluminum and the cooling and melting of sodium tetrachloroaluminate in the production process are very energy-consuming, so the sodium tetrachloroaluminate produced by this method is expensive.

[0081] In order to solve the above technical problems, in the first aspect, the present invention provides a method for producing sodium tetrachloroaluminate. Figures 1 to 7 , the production method of sodium tetrachloroaluminate is applied to a sodium tetrachloroaluminate production system including a reaction tank 1, a settling tank 2, a storage tank 3, a plurality of shutoff air inlet pipelines 4, a plurality of shutoff exhaust pipelines 5 and a plurality of shutoff material pipelines. The plurality of shutoff air inlet pipelines 4 are respectively connected to the reaction tank 1, the settling tank 2 and the storage tank 3. The plurality of shutoff exhaust pipelines 5 are respectively connected to the reaction tank 1, the settling tank 2 and the storage tank 3. The reaction tank 1 and the settling tank 2 are connected through a first shutoff material pipeline 60, the settling tank 2 and the storage tank 3 are connected through a second shutoff material pipeline 61, and one end of the third shutoff material pipeline 62 is connected to the storage tank 3. It should be noted that the material in the above-mentioned "shutoff material pipeline" can be raw materials, molten raw materials, semi-finished products or final finished products such as sodium tetrachloroaluminate. The shut-off air inlet line 4 includes an air inlet valve 40 and an air inlet line 41, the shut-off exhaust line 5 includes an exhaust valve 50 and an exhaust line 51, and the shut-off material line includes a feed valve 63, a discharge valve 64 and a material line 65. It should be noted that before the production of sodium tetrachloroaluminate, all valves are closed by default.

[0082] See also Figures 1 to 7 , the production method of sodium tetrachloroaluminate comprises:

[0083] First, raw materials are added into a reaction tank 1, wherein the raw materials include anhydrous aluminum chloride and sodium chloride;

[0084] Exemplarily, the feeding port 100 of the reaction tank 1 is opened, anhydrous aluminum chloride and sodium chloride are added into the reaction tank 1 , and the feeding port 100 of the reaction tank 1 is closed after the feeding is completed.

[0085] As a possible implementation, the mass ratio of anhydrous aluminum chloride to sodium chloride is greater than or equal to 1:0.46 and less than or equal to 1:0.5. For example, the mass ratio of anhydrous aluminum chloride to sodium chloride can be 1:0.46, 1:0.465, 1:0.47, 1:0.475, 1:0.48, 1:0.485, 1:0.49, 1:0.495 or 1:0.5, etc.

[0086] Next, when the shutoff air inlet line 4 connected to the reaction tank 1 is controlled to be in an on state and the shutoff exhaust line 5 connected to the reaction tank 1 is controlled to be in a closed state, an inert gas is introduced into the reaction tank 1;

[0087] Exemplarily, the air inlet valve 40 of the shutoff air inlet line 4 connected to the reaction tank 1 is opened to allow the inert gas to enter the reaction tank 1 through the air inlet line. The exhaust valve 50 of the shutoff exhaust line 5 connected to the reaction tank 1 is closed to prevent the inert gas in the reaction tank 1 from being discharged from the reaction tank 1 through the exhaust line.

[0088] In an optional manner, the inert gas may be nitrogen, argon, helium or neon, etc., as long as the need for producing sodium tetrachloroaluminate can be met. In an embodiment of the present invention, the inert gas is nitrogen. It should be noted that the inert gas may be provided by a gas source storing an inert gas.

[0089] Next, when the pressure in the reaction tank 1 reaches a preset value, the shutoff air inlet line 4 connected to the reaction tank 1 is controlled to be in a closed state;

[0090] As a possible implementation, the preset value is greater than or equal to 0.04 MPa and less than or equal to 0.2 MPa. For example, the preset value may be 0.04 MPa, 0.06 MPa, 0.08 MPa, 0.1 MPa, 0.12 MPa, 0.15 MPa, 0.18 MPa or 0.2 MPa.

[0091] Exemplarily, when the value displayed by the pressure gauge arranged on the reaction tank 1 is greater than or equal to 0.04 MPa and less than or equal to 0.2 MPa, the intake valve 40 that can shut off the intake pipe 4 connected to the reaction tank 1 is closed, and the inert gas is no longer introduced into the reaction tank 1.

[0092] Next, the raw materials in the reaction tank are heated to obtain a semi-finished product;

[0093] As a possible implementation method, the specific steps of heating the raw materials in the reaction tank to obtain the semi-finished product include:

[0094] First, the raw materials in the reaction tank are heated to obtain molten raw materials; the temperature of the raw materials is greater than or equal to 170° C. and less than or equal to 190° C.; the time of heating the raw materials is greater than or equal to 2 hours and less than or equal to 4 hours; for example, the temperature of the raw materials can be 170° C., 175° C., 180° C., 185° C. or 190° C., etc. The time of heating the raw materials can be 2 hours, 2.5 hours, 3 hours, 3.5 hours or 4 hours, etc.

[0095] Next, the molten raw material in the reaction tank is heated and stirred to obtain a semi-finished product; the temperature of the molten raw material is greater than or equal to 190° C. and less than or equal to 210° C.; the time of heating and stirring the molten raw material is greater than or equal to 4 hours and less than or equal to 6 hours; for example, the temperature of the molten raw material can be 190° C., 195° C., 200° C., 205° C. or 210° C., etc. The time of heating and stirring the molten raw material can be 4 hours, 4.5 hours, 5 hours, 5.5 hours or 6 hours, etc.

[0096] Exemplarily, when it is observed through the sight glass 104 disposed on the reaction tank 1 that all the raw materials are melted, the temperature is increased, and the molten raw materials in the reaction tank 1 are heated and stirred to obtain a semi-finished product.

[0097] From the above, it can be seen that in the process of processing the raw materials in the reaction tank into semi-finished products, they undergo two heating treatments and the time of the two heating treatments is relatively long. At this time, the raw materials can be prevented from being too hot in a short period of time, so as to avoid the situation where the sublimation speed of anhydrous aluminum chloride is too fast and the exhaust port of the reaction tank is blocked.

[0098] Next, the semi-finished product is transferred to the settling tank 2;

[0099] As a possible implementation method, the specific steps of transferring the semi-finished product into the settling tank 2 include: when the shutoff exhaust pipeline 5 connected to the settling tank 2 and the first shutoff material pipeline 60 are controlled to be in a conducting state, the semi-finished product is transferred into the settling tank 2 under the action of the inert gas pressure.

[0100] Exemplarily, after the stirring is finished, the exhaust valve 50 of the shutoff exhaust pipeline 5 connected to the settling tank 2, the feed valve 63 in the first shutoff material pipeline 60 connected to the settling tank 2, and the discharge valve 64 in the first shutoff material pipeline 60 connected to the reaction tank 1 are opened in sequence. At this time, the first shutoff material pipeline 60 between the reaction tank 1 and the settling tank 2 is in a conducting state, and the semi-finished product is transferred to the settling tank 2 under the pressure of the inert gas. In the case of adopting the above technical solution, compared with the use of a dedicated transfer tool, the semi-finished product is transferred from the reaction tank 1 to the settling tank 2 by using air pressure, which can not only reduce the loss of the semi-finished product during the transfer process, but also avoid the contamination of the semi-finished product due to the introduction of the transfer tool, so as to ensure the quality of the semi-finished product.

[0101] As a possible implementation method, after the semi-finished product is transferred to the settling tank, the production method of sodium tetrachloroaluminate also includes: when the liquid level of the semi-finished product in the settling tank reaches a preset value, the transfer of the semi-finished product to the settling tank is stopped to avoid excessive amount of the semi-finished product in the settling tank, which affects the subsequent production of sodium tetrachloroaluminate.

[0102] Exemplarily, a liquid level meter is provided in the settling tank, and when the liquid level meter alarms, the transfer of the semi-finished product into the settling tank is stopped.

[0103] Next, the aluminum foil is added into the sedimentation tank containing the semi-finished product, an inert gas is introduced and the tank is kept still to obtain sodium tetrachloroaluminate;

[0104] As a possible implementation method, the specific steps of adding aluminum foil into a sedimentation tank containing the semi-finished product, introducing an inert gas and keeping it still to obtain sodium tetrachloroaluminate include:

[0105] First, aluminum foil is added into the settling tank 2 containing the semi-finished product through the settling tank feeding port 207;

[0106] Exemplarily, the mass of the aluminum foil is greater than or equal to 0.3 kg and less than or equal to 0.4 kg. For example, the mass of the aluminum foil may be 0.3 kg, 0.32 kg, 0.33 kg, 0.35 kg, 0.36 kg, 0.38 kg or 0.4 kg.

[0107] Next, the first shutoff material pipeline 60 is controlled to be in a closed state, and the shutoff exhaust pipeline 5 connected to the settling tank 2 is in a conducting state, and the shutoff air intake pipeline 4 connected to the settling tank 2 is in a conducting state, so as to continuously introduce inert gas into the settling tank 2 and keep it stationary;

[0108] Exemplarily, close the discharge valve 64 of the first shutoff material pipeline 60 connected to the reaction tank 1, close the feed valve 63 of the first shutoff material pipeline 60 connected to the settling tank 2, so that the first shutoff material pipeline 60 is in a closed state, then open the exhaust valve of the shutoff exhaust pipeline 5 connected to the settling tank 2, and then open the intake valve 40 of the shutoff intake pipeline 4 connected to the settling tank 2, so that the shutoff intake pipeline 4 connected to the settling tank 2 is in a conducting state, so as to facilitate the passage of inert gas into the settling tank 2, while keeping it still.

[0109] Next, the temperature in the settling tank is set to be greater than or equal to 210° C. and less than or equal to 230° C., and the semi-finished product and the aluminum foil are heated to obtain sodium tetrachloroaluminate; the time for heating the semi-finished product and the aluminum foil is greater than or equal to 48 hours and less than or equal to 60 hours. For example, the temperature in the settling tank can be 210° C., 212° C., 215° C., 218° C., 220° C., 222° C., 225° C., 228° C., or 230° C., etc. The time for heating the semi-finished product and the aluminum foil can be 48 hours, 49 hours, 50 hours, 52 hours, 55 hours, 58 hours, or 60 hours, etc.

[0110] Next, the sodium tetrachloroaluminate is transferred to a storage tank 3 into which an inert gas is passed.

[0111] As a possible implementation method, the specific steps of transferring sodium tetrachloroaluminate to the storage tank 3 into which the inert gas is introduced include:

[0112] When the second shutoff material pipeline 61, the shutoff exhaust pipeline 5 connected to the storage tank 3, and the shutoff air intake pipeline 4 connected to the settling tank 2 are controlled to be in a conducting state, and the shutoff exhaust pipeline 5 connected to the settling tank 2 is in a closed state, inert gas is introduced into the settling tank 2 through the shutoff air intake pipeline 4 connected to the settling tank 2, so that sodium tetrachloroaluminate is transferred to the storage tank 3 under the action of the gas pressure of the inert gas.

[0113] Exemplarily, the discharge valve 64 at the connection point of the second shutoff material pipeline 61 with the settling tank 2, the feed valve 63 at the connection point of the second shutoff material pipeline 61 with the storage tank 3, the exhaust valve 50 of the shutoff exhaust pipeline 5 connected with the storage tank 3, and the air intake valve 40 of the shutoff air intake pipeline 4 connected with the settling tank 2 are opened; the exhaust valve 50 of the shutoff exhaust pipeline 5 connected with the settling tank 2 is closed, and the inert gas is continuously introduced into the settling tank 2. The inert gas introduced into the settling tank 2 through the shutoff air intake pipeline 4 connected with the settling tank 2 allows the sodium tetrachloroaluminate to be transferred to the storage tank 3 through the material pipeline extending into the settling tank 2 under the action of the gas pressure of the inert gas. When the liquid level gauge installed in the storage tank 3 sounds an alarm, stop introducing the inert gas, close the air inlet valve 40 of the shutoff air inlet pipeline 4 connected to the settling tank 2, the discharge valve 64 in the second shutoff material pipeline 61 connected to the settling tank 2, and the feed valve 63 in the second shutoff material pipeline 61 connected to the storage tank 3.

[0114] See also Figures 1 to 7Compared with the prior art, in the production method of sodium tetrachloroaluminate provided in the embodiment of the present invention, when the shutoff air inlet line 4 connected to the reaction tank 1 is controlled to be in a conducting state and the shutoff exhaust line 5 connected to the reaction tank 1 is in a closed state, an inert gas is introduced into the reaction tank 1. Next, when the pressure in the reaction tank 1 reaches a preset value, the shutoff air inlet line 4 connected to the reaction tank 1 is controlled to be in a closed state. Next, the raw materials in the reaction tank 1 are heated to obtain a semi-finished product. As can be seen from the above, after the inert gas is introduced into the reaction tank 1 to form a positive pressure, the shutoff air inlet line 4 connected to the reaction tank 1 is closed, so that the subsequent heating treatment of the raw materials in the reaction tank 1 is carried out under positive pressure, and the inert gas is no longer continuously introduced. In this process, the inert gas in the reaction tank 1 is heated due to the heating treatment of the raw materials to meet the production needs of sodium tetrachloroaluminate. Since the inert gas is no longer continuously introduced into the reaction tank 1, no inert gas that has not been subjected to the temperature increase treatment enters the reaction tank 1. At this time, the situation that the temperature in the reactor 1 is lowered due to the newly introduced inert gas that has not been heated can be reduced or avoided, so as to reduce the loss of heat in the reaction system. Further, when the pressure in the reactor 1 reaches the preset value, the shutoff air inlet line 4 connected to the reactor 1 is controlled to be in a closed state; and when the inert gas is introduced, the shutoff exhaust line 5 connected to the reactor 1 is in a closed state, so it can be known that when the pressure in the reactor 1 reaches the preset value, the reactor 1 is in a closed state. Therefore, the inert gas after heating will not be discharged from the reactor 1, and at this time, it can not only avoid the heat in the reactor 1 from being lost with the discharge of the inert gas, but also further reduce the loss of heat in the reaction system. At the same time, it can also avoid the phenomenon that the sublimation of anhydrous aluminum chloride due to the discharge of the inert gas escapes with the discharge of the inert gas, so as to reduce the loss of raw materials, and reduce or eliminate the number of times the escaped aluminum chloride is absorbed by alkali solution, so as to reduce production costs. Furthermore, since there is no need to continuously introduce inert gas, inert gas can be saved to further reduce production costs.

[0115] In addition, compared with the method of producing sodium tetrachloroaluminate using nickel material production equipment, the method of producing sodium tetrachloroaluminate provided by the embodiment of the present invention is simpler, reduces pollution to the environment, and reduces the requirements for environmental protection measures. Furthermore, since the present invention does not require the step of "melting aluminum and then melting sodium tetrachloroaluminate after cooling", the energy consumption problem caused by this step in the prior art is reduced, and the production cost is further reduced.

[0116] As a possible implementation, see Figures 1 to 7 Before adding the raw materials into the reaction tank 1, the production method of sodium tetrachloroaluminate further comprises:

[0117] When the shutoff inlet pipeline 4, the first shutoff material pipeline 60, the second shutoff material pipeline 61, and the shutoff exhaust pipeline 5 connected to the storage tank 3 are all in the conducting state, an inert gas is introduced into the reaction tank 1 and the reaction tank 1 is heated; wherein the temperature of the heated reaction tank 1 is greater than or equal to 100°C and less than or equal to 140°C; the flow rate of the inert gas is greater than or equal to 400ml / min and less than or equal to 1000ml / min; for example, the temperature of the heated reaction tank can be 100°C, 110°C, 115°C, 120°C, 125°C, 130°C, 135°C, or 140°C, etc. The flow rate of the inert gas can be 400ml / min, 500ml / min, 600ml / min, 700ml / min, 800ml / min, 900ml / min, or 1000ml / min, etc.

[0118] When the time of heating the reaction tank 1 is equal to the preset time, the inert gas is stopped from being introduced into the reaction tank 1 and the shutoff air inlet line 4, the first shutoff material line 60, the second shutoff material line 61, and the shutoff exhaust line 5 connected to the storage tank 3 connected to the reaction tank 1 are all controlled to be in a closed state; wherein the preset time is greater than or equal to 90 minutes and less than or equal to 150 minutes. For example, the preset time can be 90 minutes, 100 minutes, 110 minutes, 120 minutes, 130 minutes, 140 minutes, or 150 minutes, etc.

[0119] When the above technical solution is adopted, the raw materials can be pretreated before being added into the reaction tank, so as to reduce the moisture, remove the air and reduce the hydrolysis of the raw materials. Specifically, after the reaction tank is heated, the water turns into water vapor, and the nitrogen introduced can take away the water vapor to reduce the probability of hydrolysis of anhydrous aluminum chloride, thereby improving the quality of the finally obtained sodium tetrachloroaluminate.

[0120] Exemplarily, open the air inlet valve 40 of the shutoff air inlet line 4 connected to the reaction tank 1, the discharge valve 64 in the first shutoff material line 60 connected to the reaction tank 1, the feed valve 63 in the first shutoff material line 60 connected to the settling tank 2, the discharge valve 64 in the second shutoff material line 61 connected to the settling tank 2, the feed valve 63 in the second shutoff material line 61 connected to the storage tank 3, and the exhaust valve 50 in the shutoff exhaust line 5 connected to the storage tank 3. At this time, the shutoff air inlet line 4 connected to the reaction tank 1, the first shutoff material line 60, the second shutoff material line 61, and the shutoff exhaust line 5 connected to the storage tank 3 are all in a conducting state, and nitrogen is continuously introduced into the reaction tank 1, and then the nitrogen enters the settling tank 2 and the storage tank 3, and is then discharged through the shutoff exhaust line 5 connected to the storage tank 3. At the same time, the reaction tank 1 was heated, the heating temperature was maintained at 120° C., the flow rate of nitrogen was 600 ml / min, and after 120 minutes, the nitrogen cylinder valve was closed and all the above valves were closed.

[0121] It should be noted that sodium tetrachloroaluminate with higher purity can be obtained by setting different sedimentation times. As a possible implementation, in order to obtain two sodium tetrachloroaluminate with different purities, see Figures 1 to 7 The above-mentioned sodium tetrachloroaluminate production system includes two settling tanks 2. At this time, transferring the semi-finished product into the settling tank 2 includes:

[0122] First, the shutoff exhaust pipeline 5 connected to the first settling tank 2 and the shutoff material pipeline connected to the reaction tank 1 and the first settling tank 2 are controlled to be in an on state, and the shutoff material pipeline connected to the reaction tank 1 and the second settling tank 2 and the shutoff exhaust pipeline 5 connected to the reaction tank 1 are controlled to be in a closed state, so as to transfer part of the semi-finished product to the first settling tank 2;

[0123] Exemplarily, after the stirring is finished, the exhaust valve 50 of the shutoff exhaust line 5 connected to the first settling tank 2 is opened, the discharge valve 64 in the shutoff material line connected to the reaction tank 1 and the first settling tank 2 and connected to the reaction tank 1 is opened, and the feed valve 63 in the shutoff material line connected to the reaction tank 1 and the first settling tank 2 and connected to the first settling tank 2 is opened. At the same time, the feed valve 63 in the shutoff material line connected to the reaction tank 1 and the second settling tank 2 and connected to the second settling tank 2 is closed, the exhaust valve 50 of the shutoff exhaust line 5 connected to the reaction tank 1 is closed, and then the inert gas is continuously introduced into the reaction tank 1, so that part of the semi-finished product is transferred to the first settling tank 2 through the material line extending into the reaction tank 1 under the action of air pressure.

[0124] Next, after part of the semi-finished product is transferred to the first settling tank 2, the shutoff material pipeline connected to the reaction tank 1 and the second settling tank 2 is controlled to be in an on state, and the shutoff material pipeline connected to the reaction tank 1 and the first settling tank 2 is controlled to be in a closed state, so as to transfer the remaining semi-finished product to the second settling tank 2;

[0125] Exemplarily, the feed valve 63 in the shutoff material pipeline connected to the reaction tank 1 and the second settling tank 2 and connected to the second settling tank 2 is opened, and the feed valve 63 in the shutoff material pipeline connected to the reaction tank 1 and the first settling tank 2 and connected to the first settling tank 2 is closed. At this time, the remaining semi-finished product is transferred to the second settling tank 2 through the material pipeline extending into the reaction tank 1 under the action of air pressure.

[0126] The sedimentation time of the semi-finished product in the first sedimentation tank 2 is not equal to the sedimentation time of the semi-finished product in the second sedimentation tank 2. By controlling the sedimentation time of the semi-finished product in the two sedimentation tanks 2, different qualities of sodium tetrachloroaluminate are obtained.

[0127] As a possible implementation, see Figures 1 to 7 The production system of sodium tetrachloroaluminate further comprises: a shut-off waste discharge pipeline 7 for the reaction tank connected to the reaction tank 1 and a shut-off waste discharge pipeline 8 for the settling tank connected to the settling tank 2. The shut-off waste discharge pipeline 7 for the reaction tank comprises a waste discharge pipeline 70 for the reaction tank and a first valve 71, and the shut-off waste discharge pipeline 8 for the settling tank comprises a waste discharge pipeline 80 for the settling tank and a second valve 81.

[0128] See also Figures 1 to 7 After sodium tetrachloroaluminate is transferred to a storage tank 3 into which an inert gas is introduced, the production method of sodium tetrachloroaluminate further comprises:

[0129] The control reaction tank can shut off the waste discharge pipeline 7 to be in a conducting state, and the residue and residual liquid in the reaction tank 1 are collected;

[0130] The control settling tank can shut off the waste discharge pipeline 8 in the conducting state, and collect the residue and residual liquid in the settling tank 2;

[0131] The residue and residual liquid in reaction tank 1 and the residue and residual liquid in settling tank 2 are transferred into settling tank 2.

[0132] Exemplarily, after the semi-finished products in the reactor 1 are all transferred to the settling tank 2, the first valve 71 is opened, and the residue and residual liquid in the reactor 1 are discharged through the reactor waste discharge pipeline 70. Similarly, after the sodium tetrachloroaluminate in the settling tank 2 is all transferred to the storage tank 3, the second valve 81 is opened, and the residue and residual liquid in the settling tank 2 are discharged through the settling tank waste discharge pipeline 80. Afterwards, the residue and residual liquid in the reactor 1, the residue and residual liquid in the settling tank 2 are transferred to the settling tank 2 for sedimentation again, and the sodium tetrachloroaluminate in the residue and residual liquid is recovered. It should be noted that the above-mentioned "the residue and residual liquid in the reactor 1, the residue and residual liquid in the settling tank 2 are transferred to the settling tank 2" can be completed by mechanical equipment, or can be completed by manual transfer by staff, and is not specifically limited here.

[0133] In a second aspect, the present invention also provides a production system of sodium tetrachloroaluminate. Figures 1 to 7 , the sodium tetrachloroaluminate production system comprises: a reaction tank 1, a settling tank 2, a storage tank 3, a plurality of shutoff air inlet pipelines 4, a plurality of shutoff exhaust pipelines 5 and a plurality of shutoff material pipelines. The plurality of shutoff air inlet pipelines 4 are respectively connected to the reaction tank 1, the settling tank 2 and the storage tank 3. The plurality of shutoff exhaust pipelines 5 are respectively connected to the reaction tank 1, the settling tank 2 and the storage tank 3. The reaction tank 1 and the settling tank 2 are connected through a first shutoff material pipeline 60, the settling tank 2 and the storage tank 3 are connected through a second shutoff material pipeline 61, and one end of the third shutoff material pipeline 62 is connected to the storage tank 3. It should be noted that the materials in the above-mentioned "shutoff material pipeline" can be raw materials, molten raw materials, semi-finished products or final finished products such as sodium tetrachloroaluminate. The shut-off inlet pipeline 4 includes an inlet valve 40 and an inlet pipeline 41, the shut-off exhaust pipeline 5 includes an exhaust valve 50 and an exhaust pipeline 51, and the shut-off material pipeline includes a feed valve 63, a discharge valve 64, and a material pipeline 65. It should be noted that the above-mentioned multiple shut-off inlet pipelines 4 are connected to a main inlet pipeline 90, and one end of the main inlet pipeline 90 is connected to a gas source. The above-mentioned multiple shut-off exhaust pipelines 5 are connected to a main exhaust pipeline 91, and a collector is provided at the end of the main exhaust pipeline 91 for collecting sodium tetrachloroaluminate contained in the exhausted gas.

[0134] As a possible implementation, the intake valve and the intake pipeline are made of stainless steel. The exhaust pipeline is made of stainless steel, aluminum or nickel. The material of the material pipeline included in the first shutoff material pipeline is stainless steel, aluminum or nickel. The material of the material pipeline included in the second shutoff material pipeline and the material of the material pipeline included in the third shutoff material pipeline are aluminum or nickel. The material of the above-mentioned reaction tank is stainless steel; and / or the material of the sedimentation tank is aluminum; and / or the material of the storage tank is aluminum. Exemplarily, the stainless steel can be 316 stainless steel.

[0135] Compared with the prior art, compared with the reaction tank and / or the settling tank and / or the storage tank made of glass material, not only can the production scale be expanded, but also the probability of damage to the reaction tank and / or the settling tank and / or the storage tank can be reduced, and the safety of the production process can be improved. Further, compared with the reaction tank and / or the settling tank and / or the storage tank made of nickel material, the production cost of the reaction tank and / or the settling tank and / or the storage tank can be reduced, thereby reducing the production cost of sodium tetrachloroaluminate. Further, Cr and Ni make stainless steel generate a very dense oxide film in an oxidizing medium, so that the stainless steel is passivated. Since the radius of the chloride ion is small and the penetration ability is strong, it is most likely to penetrate the extremely small pores in the oxide film, reach the metal surface and interact with the metal to form chlorides, so that the structure of the oxide film changes, and then the stainless steel is corroded and iron ions are released. Since aluminum chloride, sodium chloride and sodium tetrachloroaluminate exist in a free state in a molten state, they will corrode the stainless steel and release iron ions. In the embodiment of the present invention, since the material of the settling tank is aluminum, and / or the material of the storage tank is aluminum, aluminum can be used to replace iron, and at this time, not only the content of iron ions in the finished product (i.e., sodium tetrachloroaluminate) can be reduced, but also the blackening of liquid or solid sodium tetrachloroaluminate caused by the presence of iron ions can be reduced or avoided. In other words, when the iron ion content is reduced, the liquid sodium tetrachloroaluminate is clear and transparent, and the solid sodium tetrachloroaluminate is pure white, based on which the quality of sodium tetrachloroaluminate can be improved. It should be noted that nickel ions will also be released at the same time, but at a low content, and the same principle as iron ions, will be replaced by aluminum. In addition, since aluminum itself is the raw material for synthesizing sodium tetrachloroaluminate, the settling tank made of aluminum material will not introduce new impurity ions compared to the settling tank made of other materials, and the quality of the sodium tetrachloroaluminate finally obtained can be further improved.

[0136] As a possible implementation, see Figures 1 to 3 The reaction tank 1 includes: a cover 10 , a reaction tank body 11 , a driving structure 12 , a stirring structure 13 , a first heating structure 14 , a first temperature sensor 15 and a second temperature sensor 16 .

[0137] See also Figures 1 to 3, the cover body 10 is provided with a feeding port 100, a reaction tank discharge port 101, a reaction tank air inlet 102, and a reaction tank exhaust port 103. In the embodiment of the present invention, a sight glass 104 is provided on the feeding port 100. One end of the first shut-off material pipeline 60 is connected to the reaction tank discharge port 101. In actual use, a quick-connect joint is provided at the end of the material pipeline 65, and a discharge valve 64 is provided on the quick-connect joint. The reaction tank air inlet 102 is connected to the corresponding shut-off air inlet pipeline 4. In actual use, a pagoda joint is provided at the reaction tank air inlet 102. The reaction tank exhaust port 103 is connected to the corresponding shut-off exhaust pipeline 5. In actual use, a quick-connect joint is provided at the end of the exhaust pipeline 51, which is connected to the quick-connect chuck at the reaction tank exhaust port 103 through the quick-connect joint, and an exhaust valve 50 is provided on the quick-connect joint.

[0138] In an alternative approach, see Figure 3 The cover body 10 is also provided with a first pressure gauge interface 105 for setting a pressure gauge so as to measure the pressure in the reaction tank 1 by using the pressure gauge.

[0139] In an alternative approach, see Figure 3 The cover body 10 comprises an inner cover body 17 and an outer cover body 18 wrapped around the outer side of the inner cover body 17. Further, a heat insulation cotton 190 is filled between the inner cover body 17 and the outer cover body 18.

[0140] See also Figure 3 , the driving structure 12 is arranged on the cover body 10. Exemplarily, the driving structure 12 includes a driving motor 120, a reducer 121 and a motor seat 122. Among them, the motor seat 122 is arranged on the cover body 10, the reducer 121 is fixed on the motor seat 122, the driving motor 120 is arranged on the reducer 121, and the driving motor 120 is drivingly connected to the reducer 121. It should be noted that the specific connection method and specific structure between the driving motor 120, the reducer 121 and the motor seat 122 can be referred to the prior art, and will not be described in detail here.

[0141] See also Figure 3 , one end of the stirring structure 13 is connected to the driving structure 12, the driving structure 12 is used to drive the stirring structure 13 to rotate, and the other end of the stirring structure 13 is located in the first cylinder 110. Exemplarily, the stirring structure 13 includes a stirring shaft 130 and a stirring paddle 131 arranged at the first end of the stirring shaft 130, the stirring paddle 131 is located in the first cylinder 110, and the power output end of the reducer 121 is connected to the second end of the stirring shaft 130. In actual use, the driving structure 12 drives the stirring shaft 130 to rotate, the stirring shaft 130 drives the stirring paddle 131 to rotate, and the stirring paddle 131 is used to stir the materials in the reaction tank 1.

[0142] In an alternative approach, see Figure 3 The reaction tank 1 further includes: a fixing member 191 and a sealing member 192. The fixing member 191 is arranged on the outer wall of the cover body 10, and the stirring structure 13 passes through the fixing member 191, and the stirring structure 13 is rotatably connected to the fixing member 191. At least part of the sealing member 192 is located in the fixing member 191 and is arranged between the stirring structure 13 and the fixing member 191, and the sealing member 192 is used to seal the cover body 10.

[0143] For example, see Figure 3 , the stirring shaft 130 passes through the fixing member 191 and is rotatably connected to the fixing member 191. The sealing member 192 is arranged between the stirring shaft 130 and the fixing member 191 to seal the gap between the stirring shaft 130 and the fixing member 191, thereby sealing the cover body 10 to prevent the inert gas or sublimated aluminum chloride from escaping from the reaction tank 1. Furthermore, the fixing member 191 can be a flange seat, and the sealing member 192 can be a mechanical sealing device. As for the specific structure of the flange seat and the mechanical sealing device, reference can be made to the prior art and will not be described in detail herein.

[0144] See also Figure 3 The cover body 10 is sealed and connected to the reaction tank body 11. Exemplarily, the cover body 10 is detachably connected to the reaction tank body 11 by screws.

[0145] See also Figure 3 The reaction tank body 11 includes a first barrel 110, a second barrel 111 and a third barrel 112 which are sequentially distributed from the inside to the outside. The second barrel 111 is arranged on at least part of the outer wall of the first barrel 110, and there is a receiving space 113 between the first barrel 110 and the second barrel 111. The receiving space 113 is used to receive the heat-conducting liquid. The third barrel 112 is at least arranged on at least part of the outer wall of the second barrel 111. Exemplarily, the third barrel 112 can be arranged on at least part of the outer wall of the second barrel 111, and the third barrel 112 can also be connected to at least part of the outer wall of the first barrel 110. The specific arrangement position of the third barrel can be selected according to actual needs, as long as it can meet the actual needs.

[0146] See also Figure 3, the first heating structure 14 is located in the accommodating space 113, and is used to heat the heat-conducting liquid, thereby heating the reaction tank 1. In an optional manner, the above-mentioned accommodating space 113 is divided into a heating space and a heat-conducting space, the first heating structure 14 is located in the heating space, and the heat-conducting liquid is located in the heat-conducting space, and the heat-conducting liquid does not affect the normal operation of the first heating structure 14. Exemplarily, two symmetrical rectangular heating spaces are provided at one end of the reaction tank body 11 away from the cover body 10 (i.e., below the reaction tank body 11), the rectangular heating space is connected to the heat-conducting space, and a heating wire is provided in the rectangular heating space. Further, an oil drain port 114 is provided at the bottom of the reaction tank body 11 (i.e., at the position corresponding to the rectangular heating space), and the oil drain port 114 is connected to the heat-conducting space for discharging the heat-conducting liquid. Correspondingly, an oil inlet 106 is provided on the side wall of the reaction tank body 11 near the cover body 10, and the oil inlet 106 is connected to the heat-conducting space for adding heat-conducting liquid into the heat-conducting space. In an optional manner, a reaction tank waste outlet 115 is further provided at the bottom of the reaction tank body 11 , and the reaction tank waste outlet 115 is communicated with the interior of the first cylinder 110 for discharging residues and residual liquid in the reaction tank 1 .

[0147] In an alternative approach, see Figure 3 A first heat-insulating structure 193 is provided between the second cylinder 111 and the third cylinder 112. The first heat-insulating structure 193 may be heat-insulating cotton. The first heat-insulating structure 193 is used to insulate the reaction tank body 11 to slow down the speed of heat loss.

[0148] See also Figure 3 , the first temperature sensor 15 is arranged on the inner side wall of the first barrel 110, and the third barrel 112 and the first temperature sensor 15 are spaced apart along the direction from the cover 10 to the reaction tank body 11, and the first temperature sensor 15 is used to detect the temperature of the material in the reaction tank 1. At this time, the first temperature sensor 15 can be prevented from contacting the first heat preservation structure 193 or the heat-conducting liquid to reduce or eliminate the influence of the first heat preservation structure 193 or the heat-conducting liquid on the detection accuracy of the first temperature sensor 15. Exemplarily, the first temperature sensor 15 is arranged on the inner side wall of the first barrel 110 and penetrates into the first barrel 110. Combined with the above description, in the embodiment of the present invention, with the first temperature sensor 15 as the center, the second barrel 111 and the third barrel 112 are both recessed inwardly (that is, the second barrel 111 and the third barrel 112 are recessed in the direction close to the first barrel), and the second barrel 111 is connected to the outer side wall of the first barrel 110, and the third barrel 112 is connected to the outer side wall of the first barrel 110. Furthermore, along the direction from the cover body 10 to the reaction tank body 11 , the third cylinder 112 and the first temperature sensor 15 are distributed at intervals.

[0149] See also Figure 3, the second temperature sensor 16 is arranged on the inner side wall of the second barrel 111, and the second temperature sensor 16 is used to detect the temperature of the heat-conducting liquid. Further, when the first heat-insulating structure 193 is arranged between the second barrel 111 and the third barrel 112, the third barrel 112 and the second temperature sensor 16 are spaced apart along the direction from the cover 10 to the reactor tank body 11. At this time, the second temperature sensor 16 can be prevented from contacting the first heat-insulating structure 193 to reduce or eliminate the influence of the first heat-insulating structure 193 on the detection accuracy of the second temperature sensor 16. Combined with the foregoing description, in an embodiment of the present invention, with the second temperature sensor 16 as the center, the third barrel 112 is recessed inwardly (that is, the third barrel 112 is recessed in the direction close to the first barrel), and the third barrel 112 is connected to the outer side wall of the second barrel 111. Further, along the direction from the cover 10 to the reactor tank body 11, the third barrel 112 and the second temperature sensor 16 are spaced apart.

[0150] As a possible implementation, see Figure 2 and Figure 3 The reaction tank 1 further comprises: a plurality of ears 194 arranged on the outer side wall of the third cylinder 112. In the embodiment of the present invention, the reaction tank 1 comprises three ears 194 arranged at intervals, and the angle between the center lines of two adjacent ears 194 is 120°. In actual use, the reaction tank 1 is fixed to the bracket by the ears 194.

[0151] As a possible implementation method, the above-mentioned reactor exhaust port, reactor discharge port, first pressure gauge interface, and reactor waste discharge port are provided with pipelines protruding relative to the cover body, and the free ends of the pipelines are welded with a quick-connect chuck to form a quick-connect structure, and a quick-connect clamp is used in conjunction. In this case, it is convenient to quickly connect with the shutoff exhaust pipeline, the shutoff material pipeline, the pressure gauge, and the reactor waste discharge pipeline.

[0152] A pipeline protruding relative to the cover body is arranged at the oil inlet, and a chuck capable of quick connection is welded on the free end of the pipeline to form a quick connection structure, which is matched with a quick connection clamp.

[0153] As a possible implementation, see Figure 1 , Figures 4 to 6 The above-mentioned sedimentation tank 2 includes: a sedimentation tank body 20, a second heating structure 21 and a second heat preservation structure 22.

[0154] See also Figures 4 to 6The settling tank body 20 is provided with a settling tank air inlet 200, a settling tank exhaust port 201, a settling tank feed port 202, a settling tank discharge port 203, a first temperature measuring sleeve interface 204 and a settling tank feeding port 207. The settling tank air inlet 200 is connected to the corresponding shutoff air inlet pipeline 4. In actual use, a pagoda joint is provided at the settling tank air inlet 200. The settling tank exhaust port 201 is connected to the corresponding shutoff exhaust pipeline 5. In actual use, a quick-connect joint is provided at the end of the exhaust pipeline 51, which is connected to the quick-connect chuck at the settling tank exhaust port 201 through the quick-connect joint, and an exhaust valve 50 is provided on the quick-connect joint. The settling tank feed port 202 is connected to the other end of the first shutoff material pipeline 60, and the settling tank discharge port 203 is connected to one end of the second shutoff material pipeline 61. In actual use, a quick connector is provided at the end of the material pipeline 65 of the first shutoff material pipeline 60, and a feed valve 63 is provided on the quick connector. A quick connector is provided at the end of the material pipeline 65 of the second shutoff material pipeline 61, and a discharge valve 64 is provided on the quick connector. The first temperature measuring sleeve interface 204 is used to install a third temperature sensor, and the third temperature sensor is used to detect the temperature of the material in the settling tank 2. For example, the first temperature measuring sleeve interface 204 is an internal thread structure, which matches the corresponding third temperature sensor. In an embodiment of the present invention, the above-mentioned settling tank feeding port 207 is used to feed reactants, such as aluminum foil.

[0155] In an alternative approach, see Figures 4 to 6 A second pressure gauge interface 205 is also provided on the settling tank body 20 for setting a pressure gauge so as to measure the pressure inside the settling tank 2 using the pressure gauge.

[0156] See also Figures 4 to 6 A second heating structure 21 is provided on at least part of the outer side wall of the settling tank body 20. In actual use, the second heating structure 21 is electrically connected or communicated with the temperature sensing controller, and the temperature sensing controller is used to control whether the second heating structure 21 is working and the heating temperature. In actual use, the third temperature sensor automatically controls the second heating structure 21 through the control device to maintain a fixed temperature in the settling tank 2, thereby meeting actual needs.

[0157] In an alternative approach, see Figure 4 A sedimentation tank waste outlet 206 is also provided at the bottom of the sedimentation tank body 20 , and the sedimentation tank waste outlet 206 is communicated with the interior of the sedimentation tank body 20 for discharging the residue and residual liquid in the sedimentation tank 2 .

[0158] See also Figure 4 and Figure 5 The second heat-insulating structure 22 covers the second heating structure 21 and the outer wall of the sedimentation tank body 20. Exemplarily, the second heat-insulating structure 22 can be heat-insulating cotton.

[0159] In an alternative approach, see Figures 4 to 6 The above-mentioned settling tank 2 also includes a plurality of legs 23 arranged on the outer side wall of the second insulation structure 22. In the embodiment of the present invention, the settling tank 2 includes three legs 23 distributed at intervals. Further, a pulley 24 is installed at the bottom of the legs 23, which is conducive to moving the settling tank 2.

[0160] It should be noted that, except for the above-mentioned interfaces, the sedimentation tank is a sealed structure as a whole. Furthermore, pipes protruding from the side wall of the sedimentation tank body are provided at the sedimentation tank discharge port, the second pressure gauge interface, the sedimentation tank exhaust port, and the sedimentation tank feed port, and a chuck that can be quickly connected is welded at the free end of the pipe to form a quick connection structure, and a quick connection clamp is used in conjunction.

[0161] As a possible implementation, see Figure 1 and Figure 7 The storage tank 3 comprises: a storage tank body 30, a third heat preservation structure 31 and a third heating structure 32. In the embodiment of the present invention, the storage tank body 30 is a horizontal storage tank body.

[0162] See also Figure 7 The storage tank body 30 is provided with a storage tank air inlet 300, a storage tank exhaust port 301, a storage tank feed port 302, a storage tank discharge port 303, a second temperature measuring sleeve interface 304 and a potentiometer sleeve 305. The storage tank air inlet 300 is connected to the corresponding shutoff air inlet pipeline 4. In actual use, a pagoda joint is provided at the storage tank air inlet 300. The storage tank exhaust port 301 is connected to the corresponding shutoff exhaust pipeline 5. In actual use, a quick-connect joint is provided at the end of the exhaust pipeline 51, which is connected to the quick-connect chuck at the storage tank exhaust port 301 through the quick-connect joint, and an exhaust valve 50 is provided on the quick-connect joint. The storage tank feed port 302 is connected to the other end of the second shutoff material pipeline 61, and the storage tank discharge port 303 is connected to one end of the third shutoff material pipeline 62. In actual use, a quick connector is provided at the end of the material pipeline 65 of the second shutoff material pipeline 61, and a feed valve 63 is provided on the quick connector. A quick connector is provided at the end of the material pipeline 65 of the third shutoff material pipeline 62, and a discharge valve 64 is provided on the quick connector. The second temperature measuring sleeve interface 304 is used to install a fourth temperature sensor, and the fourth temperature sensor is used to detect the temperature of the storage tank 3. For example, the second temperature measuring sleeve interface 304 is an internal thread structure, matching the corresponding fourth temperature sensor. The potentiometer sleeve 305 is used to install a potentiometer, for example, the potentiometer sleeve 305 is an internal thread structure, matching the corresponding potentiometer.

[0163] See also Figure 7The third thermal insulation structure 31 is coated on the outer wall of the storage tank body 30. Exemplarily, the third thermal insulation structure 31 may be thermal insulation cotton.

[0164] See also Figure 7 The third heating structure 32 is arranged on the outer side wall of the third heat preservation structure 31. For example, the third heating structure 32 may be a heating wire. In actual use, the fourth temperature sensor automatically controls the third heating structure 32 through the control device to maintain a fixed temperature in the storage tank 3, thereby meeting actual needs.

[0165] As a possible implementation method, pipes protruding from the side walls of the storage tank body are provided at the storage tank feed port, storage tank exhaust port, and storage tank discharge port. A quick-connect chuck is welded to the free end of the pipe to form a quick-connect structure, and a quick-connect clamp is used in conjunction therewith.

[0166] As a possible implementation, see Figures 1 to 7 The above-mentioned sodium tetrachloroaluminate production system also includes: a reaction tank connected to the reaction tank 1 and a waste discharge pipeline 7 that can be shut off, and a sedimentation tank connected to the sedimentation tank 2 and a waste discharge pipeline 8 that can be shut off.

[0167] The above-mentioned reaction tank shut-off waste discharge pipeline 7 includes a reaction tank waste discharge pipeline 70 and a first valve 71, and the settling tank shut-off waste discharge pipeline 8 includes a settling tank waste discharge pipeline 80 and a second valve 81. In combination with the above description, one end of the reaction tank waste discharge pipeline 70 is connected to the reaction tank waste discharge port 115, and the settling tank waste discharge pipeline 80 is connected to the settling tank waste discharge port 206.

[0168] In an embodiment of the present invention, a temperature sensor is used to monitor the temperature in real time, and the first heating structure, the second heating structure, and the third heating structure are controlled to work in combination with a power module. Specifically, the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor monitor the temperature in real time. The first heating structure of the reaction tank is controlled to work by the reaction tank automatic temperature control switch 92, the second heating structure of the sedimentation tank is controlled to work by the sedimentation tank automatic temperature control switch 93, and the third heating structure of the storage tank is controlled to work by the storage tank automatic temperature control switch 94, so as to ensure that each structure maintains a constant temperature or within a controllable range.

[0169] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for producing sodium tetrachloroaluminate, characterized in that: The application includes a sodium tetrachloroaluminate production system comprising a reaction tank, a settling tank, a storage tank, a plurality of shutoff air inlet pipelines, a plurality of shutoff exhaust pipelines and a plurality of shutoff material pipelines; the plurality of shutoff air inlet pipelines are respectively connected to the reaction tank, the settling tank and the storage tank; the plurality of shutoff exhaust pipelines are respectively connected to the reaction tank, the settling tank and the storage tank; the reaction tank and the settling tank are connected through the first shutoff material pipeline; the settling tank and the storage tank are connected through the second shutoff material pipeline; one end of the third shutoff material pipeline is connected to the storage tank; the reaction tank is made of stainless steel; the settling tank is made of aluminum; the storage tank is made of aluminum; The production method of the sodium tetrachloroaluminate comprises: Adding raw materials into the reaction tank, the raw materials comprising anhydrous aluminum chloride and sodium chloride; When the shutoff air inlet line connected to the reaction tank is controlled to be in an on state and the shutoff exhaust line connected to the reaction tank is controlled to be in a closed state, an inert gas is introduced into the reaction tank; When the pressure in the reaction tank reaches a preset value, the shutoff air inlet pipeline connected to the reaction tank is controlled to be in a closed state; Heating the raw materials in the reaction tank to obtain a semi-finished product; Transferring the semi-finished product into the settling tank; adding aluminum foil into the settling tank containing the semi-finished product, introducing inert gas and keeping it still to obtain sodium tetrachloroaluminate; setting the temperature in the settling tank to be greater than or equal to 210° C. and less than or equal to 230° C., and heating the semi-finished product and the aluminum foil to obtain sodium tetrachloroaluminate; heating the semi-finished product and the aluminum foil for a time greater than or equal to 48 hours and less than or equal to 60 hours; The sodium tetrachloroaluminate is transferred to the storage tank into which an inert gas is passed.

2. The production method of sodium tetrachloroaluminate according to claim 1, characterized in that Before adding the raw materials into the reaction tank, the production method of sodium tetrachloroaluminate further comprises: When the shutoff air inlet pipeline connected to the reaction tank, the first shutoff material pipeline, the second shutoff material pipeline, and the shutoff exhaust pipeline connected to the storage tank are all in a conducting state, an inert gas is introduced into the reaction tank and the reaction tank is heated; wherein the temperature of heating the reaction tank is greater than or equal to 100° C. and less than or equal to 140° C.; the flow rate of the inert gas is greater than or equal to 400 ml / min and less than or equal to 1000 ml / min; When the time for heating the reaction tank is equal to the preset time, stop introducing the inert gas into the reaction tank and control the shutoff air inlet line connected to the reaction tank, the first shutoff material line, the second shutoff material line, and the shutoff exhaust line connected to the storage tank to be in a closed state; the preset time is greater than or equal to 90 minutes and less than or equal to 150 minutes.

3. The production method of sodium tetrachloroaluminate according to claim 1, characterized in that Heating the raw materials in the reaction tank to obtain a semi-finished product comprises: Heating the raw material in the reaction tank to obtain a molten raw material; heating the raw material to a temperature greater than or equal to 170° C. and less than or equal to 190° C.; heating the raw material for a time greater than or equal to 2 hours and less than or equal to 4 hours; The molten raw material in the reaction tank is heated and stirred to obtain a semi-finished product; the temperature of heating the molten raw material is greater than or equal to 190° C. and less than or equal to 210° C.; the time of heating and stirring the molten raw material is greater than or equal to 4 hours and less than or equal to 6 hours.

4. The production method of sodium tetrachloroaluminate according to claim 1, characterized in that Transferring the semi-finished product to the settling tank comprises: When the shutoff exhaust pipeline connected to the settling tank and the first shutoff material pipeline are controlled to be in an on state, the semi-finished product is transferred into the settling tank under the action of the gas pressure of the inert gas.

5. The production method of sodium tetrachloroaluminate according to claim 1, characterized in that When the sodium tetrachloroaluminate production system includes two settling tanks, transferring the semi-finished product into the settling tanks includes: Control the shutoff exhaust pipeline connected to the first settling tank and the shutoff material pipeline connected to the reaction tank and the first settling tank to be in an on state, and the shutoff material pipeline connected to the reaction tank and the second settling tank and the shutoff exhaust pipeline connected to the reaction tank to be in a closed state, so as to transfer part of the semi-finished product to the first settling tank; After part of the semi-finished product is transferred to the first settling tank, the shutoff material pipeline connected to the reaction tank and the second settling tank is controlled to be in an on state, and the shutoff material pipeline connected to the reaction tank and the first settling tank is controlled to be in a closed state, so as to transfer the remaining part of the semi-finished product to the second settling tank; The time for the semi-finished product to settle in the first settling tank is not equal to the time for the semi-finished product to settle in the second settling tank.

6. The method for producing sodium tetrachloroaluminate according to claim 1, characterized in that: The mass ratio of the anhydrous aluminum chloride to the sodium chloride is greater than or equal to 1:0.46 and less than or equal to 1:0.5; And / or, the preset value is greater than or equal to 0.04 MPa and less than or equal to 0.2 MPa; And / or, the mass of the aluminum foil is greater than or equal to 0.3 kg and less than or equal to 0.4 kg.

7. The method for producing sodium tetrachloroaluminate according to claim 1, characterized in that: After the semi-finished product is transferred to the settling tank, the production method of sodium tetrachloroaluminate further comprises: when the liquid level of the semi-finished product in the settling tank reaches a preset value, stopping the transfer of the semi-finished product to the settling tank; Adding aluminum foil into the settling tank containing the semi-finished product, introducing inert gas and keeping it still to obtain sodium tetrachloroaluminate comprises: adding the aluminum foil into the settling tank containing the semi-finished product; When the first shutoff material pipeline is controlled to be in a closed state and the shutoff exhaust pipeline connected to the settling tank is in an on state, the shutoff air intake pipeline connected to the settling tank is in an on state, so as to continuously introduce inert gas into the settling tank and keep it still.

8. The method for producing sodium tetrachloroaluminate according to claim 1, characterized in that: Transferring the sodium tetrachloroaluminate to the storage tank into which the inert gas is introduced comprises: When the second shutoff material pipeline, the shutoff exhaust pipeline connected to the storage tank, and the shutoff air intake pipeline connected to the settling tank are controlled to be in a conducting state, and the shutoff exhaust pipeline connected to the settling tank is in a closed state, an inert gas is introduced into the settling tank through the shutoff air intake pipeline connected to the settling tank, so that the sodium tetrachloroaluminate is transferred to the storage tank under the action of the gas pressure of the inert gas.

9. The method for producing sodium tetrachloroaluminate according to claim 1, characterized in that: The sodium tetrachloroaluminate production system further comprises: a reaction tank connected to the reaction tank and having a shutoff waste discharge pipeline, and a settling tank connected to the settling tank and having a shutoff waste discharge pipeline; After the sodium tetrachloroaluminate is transferred to the storage tank into which the inert gas is passed, the production method of the sodium tetrachloroaluminate further comprises: Controlling the reaction tank to shut off the waste discharge pipeline to be in a conducting state, and collecting the residue and residual liquid in the reaction tank; Controlling the settling tank to shut off the waste discharge pipeline in a conducting state, and collecting the residue and residual liquid in the settling tank; The residue and residual liquid in the reaction tank and the residue and residual liquid in the settling tank are transferred into the settling tank.

10. The method for producing sodium tetrachloroaluminate according to claim 1, characterized in that: The reaction tank comprises: A cover body, wherein the cover body is provided with a feeding port, a reaction tank discharge port, a reaction tank air inlet, and a reaction tank exhaust port; one end of the first shutoff material pipeline is connected to the reaction tank discharge port; the reaction tank air inlet is connected to the corresponding shutoff air inlet pipeline, and the reaction tank exhaust port is connected to the corresponding shutoff exhaust pipeline; A reaction tank body, wherein the cover body is sealed and connected to the reaction tank body; the reaction tank body comprises a first cylinder, a second cylinder and a third cylinder which are sequentially arranged from the inside to the outside; the second cylinder is arranged on at least part of the outer wall of the first cylinder, and there is a receiving space between the first cylinder and the second cylinder, and the receiving space is used to receive a heat-conducting liquid; the third cylinder is at least arranged on at least part of the outer wall of the second cylinder; A driving structure, disposed on the cover body; A stirring structure, one end of which is connected to the driving structure, and the driving structure is used to drive the stirring structure to rotate; the other end of the stirring structure is located in the first cylinder; A first heating structure, located in the containing space, for heating the heat-conducting liquid; A first temperature sensor is arranged on the inner wall of the first cylinder; along the direction from the cover to the reaction tank body, the third cylinder and the first temperature sensor are spaced apart; the first temperature sensor is used to detect the temperature of the material in the reaction tank; The second temperature sensor is arranged on the inner wall of the second cylinder; the second temperature sensor is used to detect the temperature of the heat-conducting liquid.

11. The method for producing sodium tetrachloroaluminate according to claim 10, characterized in that: The reaction tank also includes: A fixing member is arranged on the outer wall of the cover body; the stirring structure passes through the fixing member, and the stirring structure is rotatably connected to the fixing member; A sealing member, at least a portion of which is located inside the fixing member and is disposed between the stirring structure and the fixing member; the sealing member is used to seal the cover body; The first heat-insulating structure is arranged between the second cylinder and the third cylinder; along the direction from the cover to the reaction tank body, the third cylinder and the second temperature sensor are distributed at intervals.

12. The method for producing sodium tetrachloroaluminate according to claim 1, characterized in that: The settling tank comprises: A settling tank body, wherein the settling tank body is provided with a settling tank air inlet, a settling tank exhaust port, a settling tank feed port, a settling tank discharge port, a settling tank feeding port and a first temperature measuring sleeve interface; the settling tank air inlet is connected to the corresponding said shutoff air inlet pipeline, and the settling tank exhaust port is connected to the corresponding said shutoff exhaust pipeline; the settling tank feed port is connected to the other end of the first said shutoff material pipeline, and the settling tank discharge port is connected to one end of the second said shutoff material pipeline; the first temperature measuring sleeve interface is used for installing a third temperature sensor, and the third temperature sensor is used for detecting the temperature of the material in the settling tank; A second heating structure, wherein the second heating structure is provided on at least part of the outer side wall of the settling tank body; The second heat-insulating structure covers the second heating structure and the outer side wall of the settling tank body.

13. The method for producing sodium tetrachloroaluminate according to claim 1, characterized in that: The storage tank comprises: A storage tank body, wherein the storage tank body is provided with a storage tank air inlet, a storage tank exhaust port, a storage tank feed port, a storage tank discharge port, a second temperature measuring sleeve interface and a potentiometer sleeve; the storage tank air inlet is communicated with the corresponding shutoff air inlet pipeline, and the storage tank exhaust port is communicated with the corresponding shutoff exhaust pipeline; the storage tank feed port is communicated with the other end of the second shutoff material pipeline, and the storage tank discharge port is communicated with one end of the third shutoff material pipeline; the second temperature measuring sleeve interface is used for installing a fourth temperature sensor, and the fourth temperature sensor is used for detecting the temperature of the storage tank; the potentiometer sleeve is used for installing a potentiometer; A third thermal insulation structure, covering the outer side wall of the storage tank body; The third heating structure is arranged on the outer side wall of the third heat preservation structure.

14. The method for producing sodium tetrachloroaluminate according to claim 1, characterized in that: The sodium tetrachloroaluminate production system further comprises: a reaction tank connected to the reaction tank having a shutoff waste discharge pipeline and a settling tank connected to the settling tank having a shutoff waste discharge pipeline.

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