Anhydrous aluminum trichloride production system

Abstract

The invention relates to the technical field of aluminum chloride, in particular to an anhydrous aluminum trichloride production system which comprises a reaction unit, a feeding unit, a heat exchange unit, a buffer unit and a crystallization unit, the heat exchange unit comprises a heat exchange shell and a plurality of heat exchange pipes, and the bottom wall of the heat exchange shell gradually inclines upwards in the direction away from a chlorination furnace; the buffer unit is used for buffering the aluminum trichloride and the fused salt carried by the aluminum trichloride so as to separate the fused salt from the aluminum trichloride; the feeding unit is used for feeding the chlorination furnace, generated aluminum trichloride sequentially passes through the heat exchange unit and the buffer unit and then enters the crystallization unit to form crystals, so that a set of complete and continuous production system is formed, and meanwhile, most fused salt can flow back to the chlorination furnace along the obliquely arranged heat exchange shell in the cooling process of the aluminum trichloride; and the residual molten salt is left in the buffer unit after being buffered and cooled by the buffer unit, so that most or even all of the molten salt carried in the aluminum trichloride gas can be removed, and the crystallization purity of aluminum trichloride is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum chloride, in particular to an anhydrous aluminum chloride production system. Background Art

[0002] The traditional production method of aluminum trichloride is the aluminum ingot melting method, which involves sending molten high-purity aluminum ingots into a closed chlorination furnace to react with chlorine to generate aluminum trichloride, which is then captured after condensation. However, this preparation method uses high-purity aluminum as raw material, resulting in higher production costs.

[0003] At present, a process has been developed that uses alumina as raw material and reacts with petroleum coke, mixed molten salt and chlorine in a chlorination furnace to produce anhydrous aluminum chloride, which is then cooled and crystallized to obtain the finished product. This preparation method has become more and more popular due to its low cost. However, the aluminum chloride produced at high temperature will carry some molten salt, resulting in low purity of the aluminum chloride finished product. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problem that when aluminum trichloride is prepared by using alumina as a raw material in the prior art, the aluminum trichloride generated at high temperature will carry part of the molten salt, resulting in low purity of the finished aluminum trichloride, a production system of anhydrous aluminum trichloride is provided.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: an anhydrous aluminum chloride production system, comprising:

[0006] Reaction unit, including chlorination furnace;

[0007] A feeding unit, comprising an alumina conveying line, a petroleum coke conveying line, a mixed molten salt conveying line and a chlorine gas conveying line, the output end of which is connected to the chlorination furnace;

[0008] A heat exchange unit, used for exchanging heat between low-temperature air and high-temperature aluminum chloride gas, comprising a heat exchange shell and a plurality of heat exchange tubes suspended in the heat exchange shell, wherein the bottom wall of the heat exchange shell gradually tilts upward in a direction away from the chlorination furnace so that the molten salt carried in the aluminum chloride is cooled and refluxed to the chlorination furnace;

[0009] A buffer unit, used for buffering the aluminum chloride from the heat exchange unit and the molten salt carried by it, so as to separate the molten salt from the aluminum chloride;

[0010] and a crystallization unit for crystallizing the gaseous aluminum chloride from the buffer unit.

[0011] Furthermore, the alumina conveying line includes an alumina storage tank, a plurality of alumina intermediate bins, and an alumina switching valve for connecting the alumina storage tank with any one of the alumina intermediate bins;

[0012] The petroleum coke conveying line includes a petroleum coke storage tank, a plurality of petroleum coke intermediate bins, and a petroleum coke switching valve for connecting the petroleum coke storage tank with any one of the petroleum coke intermediate bins;

[0013] The feed port of the chlorination furnace is provided with a mixing bin, in which a screw feeder is provided, a plurality of alumina intermediate bins correspond one to one with the petroleum coke intermediate bins, and the outlet ends of the alumina intermediate bins and the corresponding petroleum coke intermediate bins are provided with mixing conveying pipelines for conveying the two mixed in proportion to the mixing bin.

[0014] Furthermore, the mixed molten salt conveying line includes a molten salt circulation kettle, a molten salt heating furnace for heating the molten salt circulation kettle, and a first conveying pump for conveying the mixed molten salt in the molten salt heating furnace to the chlorination furnace.

[0015] Furthermore, a flushing pipeline and a reflux pipeline are provided between the molten salt circulation kettle and the buffer unit. The flushing pipeline is provided with a second delivery pump for delivering the mixed molten salt in the molten salt circulation kettle to the buffer unit to flush the molten salt adhered to the inner wall of the buffer unit, and the reflux pipeline is provided with a valve.

[0016] Furthermore, the buffer unit includes a plurality of elution towers arranged in series, the air inlet of the elution tower at the head end is connected to the material outlet of the heat exchange unit, and the air outlet of the elution tower at the tail end is connected to the crystallization unit.

[0017] Furthermore, a delivery pipeline is provided between the elution tower and the crystallization unit, a heat preservation mechanism is installed on the delivery pipeline, and an output end of the heat preservation mechanism is connected to a heated air outlet of the heat exchange unit.

[0018] Furthermore, the heat exchange tube includes an inner tube and an outer tube sleeved outside the inner tube, the top of the inner tube is connected to the low-temperature air inlet on the heat exchange shell, the bottom is connected to the inner cavity of the outer tube, and the top of the outer tube is connected to the heated air outlet of the heat exchange shell.

[0019] Furthermore, a first pneumatic butterfly valve, a first fast feeding mechanism, a first slow feeding mechanism, an alumina weight loss scale and a first pneumatic flap valve are sequentially arranged between the alumina intermediate bin outlet and the mixed conveying pipeline;

[0020] A second pneumatic butterfly valve, a second fast feeding mechanism, a second slow feeding mechanism, a petroleum coke loss-in-weight scale and a second pneumatic flap valve are sequentially arranged between the petroleum coke intermediate bin outlet and the mixed conveying pipeline.

[0021] Furthermore, the production system also includes:

[0022] A dust collector, the inlet of which is connected to the crystallizer and is used to collect residual materials in the crystallizer;

[0023] The tail gas buffer tank, whose inlet is connected to the dust collector to balance the system pressure;

[0024] and a salt discharge box, the inlet of which is connected to the chlorination furnace for the transfer of residual materials in the chlorination furnace.

[0025] Furthermore, the crystallization unit includes a plurality of crystallizers and a plurality of pneumatic hammers for striking the crystallizers, and the outlet of each crystallizer is sequentially provided with a third pneumatic butterfly valve, a discharge buffer tank, a fourth pneumatic butterfly valve, a turnover barrel and a weighing device.

[0026] The beneficial effects of the present invention are as follows: the present invention utilizes a feeding unit to feed a chlorination furnace, and the generated aluminum chloride sequentially passes through a heat exchange unit and a buffer unit and then enters a crystallization unit to form crystals, thereby forming a complete and continuous production system; at the same time, during the cooling process of the aluminum chloride, most of the molten salt can be refluxed to the chlorination furnace along an inclined heat exchange shell, and the remaining molten salt remains inside the buffer unit after being buffered and cooled by the buffer unit, thereby most or even all of the molten salt carried in the aluminum chloride gas can be removed, thereby improving the crystallization purity of the aluminum chloride. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the alumina conveyor line and the petroleum coke conveyor line;

[0030] Figure 3 is a schematic diagram of the internal structure of the heat exchange unit;

[0031] Figure 4 is a top view of the heat exchange unit;

[0032] In the figure:

[0033] 1. Chlorination furnace;

[0034] 2. Alumina conveying line; 201. Alumina storage tank; 202. Alumina intermediate bin; 203. Alumina switching valve; 204. First pneumatic butterfly valve; 205. First fast feeding mechanism; 206. First slow feeding mechanism; 207. Alumina loss-in-weight scale; 208. First pneumatic flap valve; 209. Mixing conveying pipeline;

[0035] 3. Petroleum coke conveying line; 301. Petroleum coke storage tank; 302. Petroleum coke intermediate bin; 303. Petroleum coke switching valve; 304. Second pneumatic butterfly valve; 305. Second fast feeding mechanism; 306. Second slow feeding mechanism; 307. Petroleum coke loss-in-weight scale; 308. Second pneumatic flap valve;

[0036] 4. Mixed molten salt conveying line; 401. Molten salt circulation kettle; 402. Molten salt heating furnace; 403. First conveying pump;

[0037] 5. Chlorine gas delivery line;

[0038] 6. Heat exchange unit; 601. Heat exchange shell; 602. Heat exchange tube; 6021. Inner tube; 6022. Outer tube;

[0039] 7. Buffer unit; 701. Elution tower;

[0040] 8. Crystallization unit; 801. Crystallizer; 802. Air hammer; 803. Third pneumatic butterfly valve; 804. Discharge buffer; 805. Fourth pneumatic butterfly valve; 806. Turnover barrel; 807. Weighing device;

[0041] 9. Mixed warehouse;

[0042] 10. Screw feeder;

[0043] 11. Flushing pipelines;

[0044] 12. Return pipe;

[0045] 13. Second delivery pump;

[0046] 14. Delivery pipeline;

[0047] 15. Insulation mechanism;

[0048] 16. Dust collector;

[0049] 17. Exhaust gas buffer tank;

[0050] 18. Salt discharge box. DETAILED DESCRIPTION

[0051] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0052] like Figure 1 and Figure 2 As shown, a system for producing anhydrous aluminum chloride comprises:

[0053] A reaction unit, comprising a chlorination furnace 1;

[0054] A feeding unit comprises an alumina conveying line 2, a petroleum coke conveying line 3, a mixed molten salt conveying line 4 and a chlorine conveying line 5 connected to the chlorination furnace 1 at the output end, that is, the alumina conveying line 2, the petroleum coke conveying line 3, the mixed molten salt conveying line 4 and the chlorine conveying line 5 respectively convey alumina, petroleum coke, mixed molten salt and chlorine to the chlorination furnace 1 for reaction to generate aluminum trichloride gas, the alumina and petroleum coke enter from the middle of the chlorination furnace 1, the chlorine enters from the bottom of the chlorination furnace 1, and the mixed molten salt enters from the top of the chlorination furnace 1;

[0055] The heat exchange unit 6 is used to exchange heat between low-temperature air and high-temperature aluminum chloride gas to output heated hot air and cooled aluminum chloride gas. It includes a heat exchange shell 601 and a plurality of heat exchange tubes 602 suspended in the heat exchange shell 601. The bottom wall of the heat exchange shell 601 gradually tilts upward in a direction away from the chlorination furnace 1 so that the molten salt carried in the aluminum chloride can be cooled and refluxed to the chlorination furnace 1. The low-temperature air enters the heat exchange unit 6 through the dehumidifier and the air pump in turn, and the dehumidifier removes moisture from the low-temperature air.

[0056] The high-temperature aluminum chloride gas in the chlorination furnace 1 enters the heat exchange unit 6 and exchanges heat with the low-temperature air in the heat exchange tube 602. The low-temperature air is located inside the heat exchange tube 602, and the aluminum chloride gas is located outside the heat exchange tube 602. The two are not in contact. When the aluminum chloride gas is cooled, the high-temperature molten salt it carries is also cooled synchronously, and drips along the wall of the heat exchange tube 602 to the bottom wall of the heat exchange shell 601, and then flows back to the chlorination furnace 1 along the inclined bottom wall.

[0057] The buffer unit 7 is used to buffer the aluminum chloride from the heat exchange unit 6 to separate the molten salt from the aluminum chloride. The aluminum chloride gas cooled by the heat exchange unit 6 enters the buffer unit 7, and the molten salt carried by the aluminum chloride gas can be retained inside the buffer unit 7 after buffering, and the aluminum chloride gas flows out of the buffer unit 7;

[0058] and a crystallization unit 8 for crystallizing the gaseous aluminum chloride from the buffer unit 7.

[0059] First, the alumina conveying line 2, the petroleum coke conveying line 3, the mixed molten salt conveying line 4 and the chlorine conveying line 5 respectively convey the alumina, petroleum coke, the mixed molten salt and the chlorine to the chlorination furnace 1 for reaction to generate aluminum trichloride gas, and then the high-temperature aluminum trichloride gas enters the heat exchange unit 6 to exchange heat with the low-temperature air in the heat exchange tube 602, and outputs the cooled aluminum trichloride gas. During the process, the molten salt carried by the aluminum trichloride gas is cooled synchronously, and most of the molten salt flows back to the chlorination furnace 1 along the inclined bottom wall of the heat exchange shell 601, and then the aluminum trichloride gas enters the buffer unit 7 for buffering, and the remaining small amount of molten salt it carries remains in the buffer unit 7 to achieve its separation from the aluminum trichloride gas, and finally the aluminum trichloride gas enters the crystallization unit 8 for crystallization, and the finished product after crystallization is transported to the packaging workshop for packaging.

[0060] In some examples, the alumina conveying line 2 includes an alumina storage tank 201, a plurality of alumina intermediate bins 202, and an alumina switching valve 203 for connecting the alumina storage tank 201 with any one of the alumina intermediate bins 202. In this embodiment, two alumina intermediate bins 202 are provided, and the alumina switching valve 203 is used to switch the connection state between the two alumina intermediate bins 202 and the alumina storage tank 201.

[0061] The petroleum coke conveying line 3 includes a petroleum coke storage tank 301, a plurality of petroleum coke intermediate bins 302, and a petroleum coke switching valve 303 for connecting the petroleum coke storage tank 301 with any one of the petroleum coke intermediate bins 302; in this embodiment, two petroleum coke intermediate bins 302 are provided, and the petroleum coke switching valve 303 is used to switch the connection state between the two petroleum coke intermediate bins 302 and the petroleum coke storage tank 301;

[0062] The feed port of the chlorination furnace 1 is provided with a mixing bin 9, in which a screw feeder 10 is provided, a plurality of alumina intermediate bins 202 correspond one-to-one to a plurality of petroleum coke intermediate bins 302, and the outlet ends of the alumina intermediate bins 202 and the corresponding petroleum coke intermediate bins 302 are provided with a mixing conveying pipeline 209 for conveying the two mixed in proportion to the mixing bin 9. In this embodiment, two mixing conveying pipelines 209 are provided, and the two mixing conveying pipelines 209, the two alumina intermediate bins 202 and the two petroleum coke intermediate bins 302 correspond one-to-one respectively.

[0063] During feeding, alumina falls onto the mixing conveying pipeline 209 via the alumina storage tank 201 and the alumina intermediate bin 202 in turn, and petroleum coke also falls onto the mixing conveying pipeline 209 via the petroleum coke storage tank 301 and the petroleum coke intermediate bin 302 in turn. The mixing conveying pipeline 209 conveys the alumina and petroleum coke thereon to the mixing bin, and the screw feeder 10 mixes the alumina and petroleum coke and feeds them into the chlorination furnace 1.

[0064] In some examples, the mixed molten salt conveying line 4 includes a molten salt circulation kettle 401, a molten salt heating furnace 402 for heating the molten salt circulation kettle 401, and a first conveying pump 403 for conveying the mixed molten salt in the molten salt heating furnace 402 to the chlorination furnace 1. After the molten salt heating furnace 402 heats the mixed molten salt in the molten salt circulation kettle 401 to a certain temperature, it is conveyed into the chlorination furnace 1 through the first conveying pump 403. When the temperature is too high, the molten salt circulation kettle 401 can be cooled by a blower.

[0065] In some examples, a flushing pipeline 11 and a reflux pipeline 12 are provided between the molten salt circulation kettle 401 and the buffer unit 7, the flushing pipeline 11 is provided with a second delivery pump 13 for delivering the mixed molten salt in the molten salt circulation kettle 401 to the buffer unit 7 to flush the molten salt adhered to the inner wall of the buffer unit 7, and the reflux pipeline 12 is provided with a valve, and the valve includes a pneumatic gate valve and a manual gate valve located at the top; the input end of the flushing pipeline 11 is located on the molten salt circulation kettle 401, and the output end is located on the buffer unit 7, and the input end of the reflux pipeline 12 is located on the buffer unit 7, and the output end is located on the buffer unit 7. The end is located on the molten salt circulation kettle 401. The molten salt carried by the aluminum chloride gas enters the buffer unit 7 for buffering and cooling. It will adhere to the inner wall of the buffer unit 7 and slide along the inner wall, and then enter the molten salt circulation kettle 401 through the reflux pipe 12. After long-term use, the high-boiling point molten salt will adhere to the inner wall of the buffer unit 7. At this time, the molten salt in the molten salt circulation kettle 401 can be transported to the buffer unit 7 through the second delivery pump 13 during the production interval, and the molten salt in it can be sprayed and flushed through a nozzle, etc., the adhered molten salt is flushed to the bottom of the buffer unit 7, and enters the molten salt circulation kettle 401 again along the reflux pipe 12.

[0066] In some examples, the buffer unit 7 includes several elution towers 701 arranged in series, the air inlet of the elution tower 701 located at the head end is connected to the material outlet of the heat exchange unit 6, and the air outlet of the elution tower 701 located at the tail end is connected to the crystallization unit 8. The aluminum chloride gas enters the several elution towers 701 in turn for buffering and cooling, and the nozzle in the elution tower 701 can flush the molten salt adhered to its inner wall.

[0067] In some examples, a conveying pipeline 14 is provided between the elution tower 701 and the crystallization unit 8, and an insulation mechanism 15 is installed on the conveying pipeline 14. The output end of the insulation mechanism 15 is connected to the heated air outlet of the heat exchange unit 6. The high-temperature aluminum chloride gas exchanges heat with the low-temperature air and outputs the heated air, which can be used as a heat source to insulate the conveying pipeline 14 to avoid excessive cooling of aluminum chloride during long-distance transportation or excessive cooling caused by contact between aluminum chloride and the conveying pipeline 14, resulting in aluminum chloride crystallizing in the conveying pipeline 14 in advance and blocking the conveying pipeline 14.

[0068] In some examples, the heat exchange tube 602 includes an inner tube 6021 and an outer tube 6022 sleeved outside the inner tube 6021. The top of the inner tube 6021 is connected to the low-temperature air inlet on the heat exchange shell 601, and the bottom is connected to the inner cavity of the outer tube 6022. The top of the outer tube 6022 is connected to the warming air outlet of the heat exchange shell 601. After the low-temperature air enters the inner tube 6021 from the low-temperature air inlet, it enters the inner cavity of the outer tube 6022 from the bottom of the inner tube 6021. A cooling cavity is formed between the outer peripheral wall of the inner tube 6021 and the inner peripheral wall of the outer tube 6022 to exchange heat with the high-temperature aluminum chloride gas entering the heat exchange shell 601.

[0069] The top wall and the bottom wall of the heat exchange shell 601 are parallel to form a heat exchange shell 601 with an overall inclined structure. When low-temperature air is continuously introduced into the heat exchange tube 602, a low-temperature environment is formed in the entire heat exchange shell 601, so that the aluminum chloride gas is cooled not only when it contacts the heat exchange tube 602, but also when it contacts the wall surface of the heat exchange shell 601. At this time, the molten salt can reflux not only along the bottom wall of the heat exchange shell 601, but also along the top wall of the heat exchange shell 601.

[0070] A plurality of heat exchange tubes 602 are arranged at intervals in the heat exchange shell 601 and are divided into several rows along the direction from the chlorination furnace 1 to the buffer unit 7 . Each row of heat exchange tubes 602 is staggered and gradually moves upward to form an overall inclined structure, which is consistent with the inclined direction of the heat exchange shell 601 .

[0071] In some examples, a first pneumatic butterfly valve 204, a first fast feeding mechanism 205, a first slow feeding mechanism 206, an alumina loss-in-weight scale 207 and a first pneumatic flap valve 208 are sequentially provided between the outlet of the alumina intermediate bin 202 and the mixing conveying pipeline 209; the first fast feeding mechanism 205 and the first slow feeding mechanism 206 are both spiral feeding mechanisms, and the first fast feeding mechanism 205 can quickly feed the alumina from the outlet of the alumina intermediate bin 202 into the next tool to increase the feeding speed, and the first slow feeding mechanism 206 is used to smoothly feed the alumina into the alumina loss-in-weight scale 207 to improve the weighing accuracy.

[0072] A second pneumatic butterfly valve 304, a second fast feeding mechanism 305, a second slow feeding mechanism 306, a petroleum coke loss-in-weight scale 307 and a second pneumatic flap valve 308 are sequentially arranged between the outlet of the petroleum coke intermediate bin 302 and the mixing and conveying pipeline 209; the second fast feeding mechanism 305 and the second slow feeding mechanism 306 are both spiral feeding mechanisms, and the second fast feeding mechanism 305 can quickly feed the petroleum coke from the outlet of the petroleum coke intermediate bin 302 into the next tool to increase the feeding speed, and the second slow feeding mechanism 306 is used to smoothly feed the petroleum coke into the petroleum coke loss-in-weight scale 307 to improve the weighing accuracy.

[0073] In some examples, the production system further includes:

[0074] The dust collector 16, whose inlet is connected to the crystallization unit 8, is used to collect the remaining materials in the crystallizer 801. An air hammer 802 is provided on the outside to knock the dust collector 16 to knock off the crystals attached to the inner wall. The bottom of the dust collector 16 is provided with a fifth pneumatic butterfly valve and a turnover barrel;

[0075] The tail gas buffer tank 17, whose inlet is connected to the dust collector 16 for balancing the system pressure, has several tanks and is connected in series;

[0076] And a salt discharge box 18, whose inlet is communicated with the chlorination furnace 1 for the transfer of the remaining materials in the chlorination furnace 1. When the chlorination furnace 1 is overhauled, the remaining materials inside can be transferred to the salt discharge box 18 for temporary storage.

[0077] In some examples, the crystallization unit 8 includes a plurality of crystallizers 801 and a plurality of pneumatic hammers 802 for striking the crystallizers 801. The outlet of each crystallizer 801 is sequentially provided with a third pneumatic butterfly valve 803, a discharge buffer tank 804, a fourth pneumatic butterfly valve 805, a turnover barrel 806 and a weighing machine 807. After aluminum chloride gas forms crystals inside the crystallizer 801, the crystals can be knocked to the bottom of the crystallizer 801 by the pneumatic hammer 802, and enter the turnover barrel 806 through the third pneumatic butterfly valve 803, the discharge buffer tank 804 and the fourth pneumatic butterfly valve 805 in turn, and are transferred to the packaging workshop after being weighed by the weighing machine 807.

[0078] Working principle:

[0079] During feeding, alumina falls onto the mixed conveying pipeline 209 through the alumina storage tank 201 and the alumina intermediate bin 202 in turn, and petroleum coke also falls onto the mixed conveying pipeline 209 through the petroleum coke storage tank 301 and the petroleum coke intermediate bin 302 in turn. The mixed conveying pipeline 209 conveys the alumina and petroleum coke thereon to the mixing bin, and the screw feeder 10 mixes the alumina and petroleum coke and feeds them into the chlorination furnace 1. At the same time, the first delivery pump 403 conveys the mixed molten salt to the chlorination furnace 1, and the chlorine delivery line 5 conveys the chlorine to the chlorination furnace 1 and then reacts together to generate aluminum trichloride gas.

[0080] Then the high-temperature aluminum chloride gas enters the heat exchange unit 6 to exchange heat with the low-temperature air in the heat exchange tube 602, and outputs cooled aluminum chloride gas. During the process, the molten salt carried by the aluminum chloride gas is cooled synchronously, and most of the molten salt flows back to the chlorination furnace 1 along the inclined heat exchange shell 601. Then the aluminum chloride gas enters the buffer unit 7 for buffering and cooling, and the remaining small amount of molten salt it carries remains in the buffer unit 7 to achieve separation from the aluminum chloride gas. Part of the molten salt in the buffer unit 7 slides along the inner wall, and then enters the molten salt circulation kettle 401 through the reflux pipeline 12, and the other part of the molten salt adheres to the inner wall of the buffer unit 7. At this time, the molten salt in the molten salt circulation kettle 401 can be transported to the buffer unit 7 through the second delivery pump 13 during the production gap, and the molten salt in it can be sprayed and flushed through a nozzle, etc., and the adhered molten salt is flushed to the bottom of the buffer unit 7, so that it enters the molten salt circulation kettle 401 again along the reflux pipeline 12. Finally, the aluminum chloride gas flowing out of the buffer unit 7 enters the crystallization unit 8 for crystallization, and the finished product after crystallization is transported to the packaging workshop for packaging.

[0081] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An anhydrous aluminum chloride production system, characterized in that: include: A reaction unit, comprising a chlorination furnace (1); A feeding unit, comprising an alumina conveying line (2), a petroleum coke conveying line (3), a mixed molten salt conveying line (4) and a chlorine gas conveying line (5) whose output ends are connected to the chlorination furnace (1); A heat exchange unit (6) is used for exchanging heat between low-temperature air and high-temperature aluminum chloride gas, comprising a heat exchange shell (601) and a plurality of heat exchange tubes (602) suspended in the heat exchange shell (601), wherein the bottom wall of the heat exchange shell (601) gradually tilts upward in a direction away from the chlorination furnace (1) so that the molten salt carried in the aluminum chloride is cooled and refluxed to the chlorination furnace (1); A buffer unit (7) is used to buffer the aluminum chloride and the molten salt carried by the aluminum chloride from the heat exchange unit (6) to separate the molten salt from the aluminum chloride; and a crystallization unit (8) for crystallizing the gaseous aluminum chloride from the buffer unit (7).

2. A kind of anhydrous aluminum chloride production system according to claim 1, characterized in that: The alumina conveying line (2) comprises an alumina storage tank (201), a plurality of alumina intermediate bins (202), and an alumina switching valve (203) for connecting the alumina storage tank (201) with any one of the alumina intermediate bins (202); The petroleum coke conveying line (3) comprises a petroleum coke storage tank (301), a plurality of petroleum coke intermediate bins (302), and a petroleum coke switching valve (303) for connecting the petroleum coke storage tank (301) with any one of the petroleum coke intermediate bins (302); The feed inlet of the chlorination furnace (1) is provided with a mixing bin (9), a screw feeder (10) is provided in the mixing bin (9), a plurality of alumina intermediate bins (202) correspond to a plurality of petroleum coke intermediate bins (302) in a one-to-one manner, and a mixing conveying pipeline (209) for conveying the two mixed materials in a proportional manner to the mixing bin (9) is provided at the outlet ends of the alumina intermediate bins (202) and the corresponding petroleum coke intermediate bins (302).

3. A kind of anhydrous aluminum chloride production system according to claim 1, characterized in that: The mixed molten salt conveying line (4) comprises a molten salt circulation kettle (401), a molten salt heating furnace (402) for heating the molten salt circulation kettle (401), and a first conveying pump (403) for conveying the mixed molten salt in the molten salt heating furnace (402) to the chlorination furnace (1).

4. A kind of anhydrous aluminum chloride production system according to claim 3, characterized in that: A flushing pipeline (11) and a reflux pipeline (12) are provided between the molten salt circulation kettle (401) and the buffer unit (7); the flushing pipeline (11) is provided with a second delivery pump (13) for delivering the mixed molten salt in the molten salt circulation kettle (401) to the buffer unit (7) to flush the molten salt adhered to the inner wall of the buffer unit (7).

5. A kind of anhydrous aluminum chloride production system according to claim 1, characterized in that: The buffer unit (7) comprises a plurality of elution towers (701) arranged in series, wherein the air inlet of the elution tower (701) at the head end is connected to the material outlet of the heat exchange unit (6), and the air outlet of the elution tower (701) at the tail end is connected to the crystallization unit (8).

6. A kind of anhydrous aluminum chloride production system according to claim 5, characterized in that: A delivery pipeline (14) is provided between the elution tower (701) and the crystallization unit (8), and a heat preservation mechanism (15) is installed on the delivery pipeline (14). The output end of the heat preservation mechanism (15) is connected to the heated air outlet of the heat exchange unit (6).

7. A kind of anhydrous aluminum chloride production system according to claim 1, characterized in that: The heat exchange tube (602) comprises an inner tube (6021) and an outer tube (6022) sleeved on the outside of the inner tube (6021); the top of the inner tube (6021) is connected to the low-temperature air inlet on the heat exchange shell (601); the bottom is connected to the inner cavity of the outer tube (6022); the top of the outer tube (6022) is connected to the heated air outlet of the heat exchange shell (601).

8. A kind of anhydrous aluminum chloride production system according to claim 2, characterized in that: A first pneumatic butterfly valve (204), a first fast feeding mechanism (205), a first slow feeding mechanism (206), an alumina weight loss scale (207) and a first pneumatic flap valve (208) are sequentially arranged between the outlet of the alumina intermediate bin (202) and the mixing and conveying pipeline (209); A second pneumatic butterfly valve (304), a second fast feeding mechanism (305), a second slow feeding mechanism (306), a petroleum coke loss-in-weight scale (307) and a second pneumatic flap valve (308) are sequentially arranged between the petroleum coke intermediate bin (302) outlet and the mixing and conveying pipeline (209).

9. A kind of anhydrous aluminum chloride production system according to claim 1, characterized in that: The production system also includes: A dust collector (16), the inlet of which is connected to the crystallization unit (8) and is used to collect residual materials in the crystallization unit (8); An exhaust gas buffer tank (17), the inlet of which is connected to the dust collector (16) for balancing the system pressure; and a salt discharge box (18), the inlet of which is connected to the chlorination furnace (1) for transferring the remaining materials in the chlorination furnace (1).

10. A system for producing anhydrous aluminum chloride according to claim 1, characterized in that: The crystallization unit (8) comprises a plurality of crystallizers (801) and a plurality of pneumatic hammers (802) for striking the crystallizers (801), and the outlet of each crystallizer (801) is provided with a third pneumatic butterfly valve (803), a discharge buffer tank (804), a fourth pneumatic butterfly valve (805), a turnover barrel (806) and a weighing device (807) in sequence.

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