Device and method for recovering heat lost from copper melting tank

Abstract

The invention discloses a device and method for recycling lost heat of a copper dissolving tank, belonging to the technical field of electrolytic copper foil, comprising: a copper dissolving tank, a low-level tank and a plate heat exchanger; an overflow pipe is connected between the copper dissolving tank and the low-level tank; the invention realizes the circulation of the solution in the copper dissolving tank through a spray pump group and a spray main pipe, and then forms a circulation pipeline with the low-level tank and the copper dissolving tank through a copper supplement pipe and an overflow pipe; under the transportation of the copper supplement pump group, the solution in the low-level tank is introduced into the copper dissolving tank, and then refluxed through the overflow pipe; at the same time, a plate heat exchanger is arranged between the low-level tank and the copper dissolving tank, and the solutions in the copper dissolving tank and the low-level tank are respectively introduced into the plate heat exchanger through the spray bypass pipe and the copper supplement pipe to realize heat exchange, which can not only greatly increase the temperature of the solution in the copper dissolving tank, but also reduce the temperature of the solution in the low-level tank, and reduce the cooling pressure of the cooling water at the rear end; the heat is reasonably utilized to reduce energy consumption.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic copper foil, and in particular to a device and method for recovering lost heat from a copper dissolving tank. Background Art

[0002] In the electrolytic copper foil industry, copper wires or copper plates are placed in a copper dissolving tank and are immersed or sprayed with a continuously flowing sulfuric acid solution or a low-concentration copper sulfate solution to react chemically with the copper wires or copper plates to dissolve the copper wires or copper plates and increase the concentration of the copper sulfate solution; a high-concentration electrolytic stock solution is provided for the subsequent process. At the same time, when copper reacts chemically with sulfuric acid, a large amount of heat is generated, and the increase in temperature further accelerates the chemical reaction.

[0003] After copper electrolysis, the copper sulfate solution changes from high concentration to low concentration and is returned from the machine to the low-level tank. The low-level tank serves as the supply tank for the copper electrolysis process, and the returned electrolyte needs to increase the copper concentration. Usually, in order to increase the copper concentration in the low-level tank, the low-copper and low-temperature solution in the low-level tank is pumped back to the copper dissolving tank through a pump group for secondary copper dissolving reaction. After the reaction is sufficient, the copper concentration and temperature of the copper sulfate solution increase. Because the copper dissolving tank is higher than the low-level tank, an overflow pipe is set to overflow the high-temperature and high-concentration copper sulfate solution back to the low-level tank. In this way, the copper concentration of the electrolyte returned from the machine is continuously increased in a reciprocating manner, so that the concentration of the entire low-level tank is maintained in a stable range.

[0004] During the appeal process, the temperature of the low-copper solution pumped back into the copper dissolving tank from the low-level tank was, on average, 20°C lower than the temperature of the solution in the copper dissolving tank, causing the temperature of the solution in the copper dissolving tank to drop, slowing down the copper dissolving efficiency and limiting the ability of the copper dissolving tank to dissolve cheaper thick copper wires and even copper plates. The high-copper solution overflowing from the copper dissolving tank overflowed into the low-level tank along with the high temperature. The low-level tank did not need such high-temperature liquid and needed to be cooled in the subsequent process, resulting in a waste of energy. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for recovering the heat lost in a copper dissolving tank. The heat generated by the chemical reaction in the copper dissolving tank is transferred to the solution transported from the low-level tank to the copper dissolving tank through a plate heat exchanger, thereby increasing the temperature of the solution, raising the initial temperature of the chemical reaction, and helping to increase the reaction rate. At the same time, the temperature of the solution entering the low-level tank from the copper dissolving tank is reduced, thereby avoiding subsequent cooling treatment, rationally converting and utilizing the heat, and reducing energy consumption, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a device for recovering heat lost from a copper melting tank, comprising:

[0007] Copper melting tank, low-level tank and plate heat exchanger;

[0008] An overflow pipe is connected between the copper dissolving tank and the low-level tank, a liquid storage tank is designed at the lower end of the inner cavity of the copper dissolving tank, and a reflux spray system is arranged on the outer side of the copper dissolving tank;

[0009] The reflux spray system includes a spray pump group and a spray main pipe, one end of the spray main pipe is connected to the liquid storage tank at the lower end of the copper dissolving tank, the other end of the spray main pipe extends upward and is connected to the upper end of the copper dissolving tank, and the spray pump group is installed on the spray main pipe;

[0010] The top of the low-position tank is connected with a copper-supplementing pipeline, the other end of which is connected with the upper end of the copper-dissolving tank, and a copper-supplementing pump group is installed on the copper-supplementing pipeline;

[0011] The outside of the spray main pipe is connected with a first valve, and the end of the first valve away from the spray main pipe is connected with a spray bypass pipe, the end of the spray bypass pipe away from the first valve is connected with the high-temperature liquid inlet of the plate heat exchanger, the high-temperature liquid outlet of the plate heat exchanger is connected with a reflux pipe, the end of the reflux pipe away from the plate heat exchanger is connected with an overflow pipe, the low-temperature liquid inlet and the low-temperature liquid outlet of the plate heat exchanger are respectively connected with a first pipe and a second pipe, and the ends of the first pipe and the second pipe away from the plate heat exchanger are both connected with the copper filling pipe.

[0012] Preferably, the spray bypass pipe is connected to a detection pipe, one end of the detection pipe away from the spray bypass pipe is connected to the upper end of the copper dissolving tank, the detection pipe is connected to a copper concentration detection device, and a second valve is installed on the detection pipe at the front end of the detection device.

[0013] Preferably, a third valve, a high-concentration flowmeter and an automatic overflow valve are sequentially installed on the spray bypass pipeline, and the spray bypass pipeline around the high-concentration flowmeter is made into a backwater bay shape.

[0014] Preferably, a fourth valve is installed on the first pipeline, a fifth valve is installed on the copper-filled pipeline, the fifth valve is located between the first pipeline and the second pipeline, and a sixth valve is installed on the second pipeline.

[0015] Preferably, a copper-replenishing flowmeter and a copper-replenishing automatic valve are installed on the copper-replenishing pipeline, and the copper-replenishing flowmeter and the copper-replenishing automatic valve are located at the upper end of the first pipeline.

[0016] Preferably, the copper dissolving tank is provided with an overflow port, the overflow port is communicated with the liquid storage tank, and the overflow pipe is communicated with the overflow port.

[0017] Preferably, the first pipeline is connected to a first liquid discharge pipe extending downward, a first ball valve is installed on the first liquid discharge pipe, and the first liquid discharge pipe is located between the fourth valve and the plate heat exchanger.

[0018] Preferably, the spray bypass pipeline is connected to a second liquid discharge pipe extending downward, a second ball valve is installed on the second liquid discharge pipe, and the second liquid discharge pipe is located between the high-concentration flowmeter and the third valve.

[0019] Preferably, the position of the low-position tank is lower than that of the copper dissolving tank, and a thermometer is installed on the second pipeline at the lower end of the sixth valve.

[0020] Based on a device for recovering lost heat from a copper melting tank, a method for recovering lost heat from a copper melting tank is also provided, comprising the following steps:

[0021] S1. Add some copper materials with large reaction area such as thick copper wire and copper plate to the upper end of the inner cavity of the copper dissolving tank;

[0022] S2, start the spray pump group, use the spray pump group to transport the solution in the storage tank upward, and transport it from the spray main pipe to the top of the copper dissolving tank to react chemically with the copper material again, thereby increasing the copper concentration of the solution in the storage tank. At the same time, start the copper replenishment pump group, and introduce the low-concentration copper sulfate solution returned from the electrolysis machine in the low-level tank into the copper dissolving tank through the copper replenishment pipeline to increase the amount of solution in the storage tank. At this time, the solution level rises and flows back to the low-level tank from the overflow pipeline;

[0023] S3. Connect the spray bypass pipe with the spray main pipe, so that part of the high-temperature solution in the spray main pipe is transported to the plate heat exchanger, and then flows back to the overflow pipe through the reflux pipe and flows into the low-level tank. At the same time, the first pipe and the second pipe are connected as the main conveying channel of the copper-filling pipe. The low-temperature solution in the low-level tank flows into the heat exchanger, and heat exchange is realized inside the heat exchanger to increase the temperature of the solution in the copper-filling pipe. After the solution transported by the copper-filling pipe enters the copper-dissolving tank, the temperature is increased, which accelerates the reaction speed with the copper material, thereby avoiding the heat generated by the chemical reaction in the copper-dissolving tank from being wasted.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention realizes the circulation of the solution in the copper dissolving tank through a spray pump group and a spray main pipe, and then forms a circulation pipeline with the low-level tank and the copper dissolving tank by using the copper supplement pipe and the overflow pipe. Under the transportation of the copper supplement pump group, the solution in the low-level tank is introduced into the copper dissolving tank, and then refluxed by the overflow pipe. At the same time, a plate heat exchanger is arranged between the low-level tank and the copper dissolving tank, and the solutions in the copper dissolving tank and the low-level tank are respectively introduced into the plate heat exchanger by using the spray bypass pipe and the first pipe to realize heat exchange, which can not only greatly increase the temperature of the solution in the copper dissolving tank, but also reduce the temperature of the solution in the low-level tank, thereby reducing the cooling pressure of the cooling water at the rear end; the heat is reasonably utilized to reduce energy consumption.

[0026] 2. The present invention provides the first liquid drain pipe and the second liquid drain pipe, so that the internal solution can be drained away when the plate heat exchanger is cleaned and maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the copper dissolving tank loss utilization and recovery system of the present invention;

[0028] Figure 2 This is a schematic diagram of a heat exchange system that is not in operation according to the present invention;

[0029] Figure 3 This is a schematic diagram of the heat exchange system of the present invention.

[0030] Numbers in the figure: 1. Copper dissolving tank; 2. Low-level tank; 3. Plate heat exchanger; 4. Overflow pipe; 5. Liquid storage tank; 6. Spray pump group; 7. Spray main pipe; 8. Copper replenishing pipe; 9. Copper replenishing pump group; 10. First valve; 11. Spray bypass pipe; 12. Return pipe; 13. First pipe; 14. Second pipe; 15. Detection pipe; 16. Second valve; 17. Third valve; 18. High concentration flowmeter; 19. Overflow automatic valve; 20. Fourth valve; 21. Fifth valve; 22. Sixth valve; 23. Copper replenishing flowmeter; 24. Copper replenishing automatic valve; 25. Overflow port; 26. First drain pipe; 27. First ball valve; 28. Second drain pipe; 29. ​​Second ball valve; 30. Thermometer. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The present invention provides Figure 1 The device shown is for recovering lost heat from a copper melting tank, comprising:

[0033] Copper dissolving tank 1, low-level tank 2 and plate heat exchanger 3;

[0034] An overflow pipe 4 is connected between the copper dissolving tank 1 and the low-level tank 2, a liquid storage tank 5 is designed at the lower end of the inner cavity of the copper dissolving tank 1, and a reflux spray system is arranged on the outer side of the copper dissolving tank 1;

[0035] The reflux spray system includes a spray pump group 6 and a spray main pipe 7. One end of the spray main pipe 7 is connected to the liquid storage tank 5 at the lower end of the copper dissolving tank 1. The other end of the spray main pipe 7 extends upward and is connected to the upper end of the copper dissolving tank 1. The spray pump group 6 is installed on the spray main pipe 7.

[0036] The top of the low-level tank 2 is connected with a copper-supplementing pipe 8, the other end of the copper-supplementing pipe 8 is connected with the upper end of the copper-dissolving tank 1, and a copper-supplementing pump group 9 is installed on the copper-supplementing pipe 8;

[0037] The outside of the spray main pipe 7 is connected with a first valve 10, and the end of the first valve 10 away from the spray main pipe 7 is connected with a spray bypass pipe 11, and the end of the spray bypass pipe 11 away from the first valve 10 is connected with the high-temperature liquid inlet of the plate heat exchanger 3, and the high-temperature liquid outlet of the plate heat exchanger 3 is connected with a reflux pipe 12, and the end of the reflux pipe 12 away from the plate heat exchanger 3 is connected with the overflow pipe 4, and the low-temperature liquid inlet and the low-temperature liquid outlet of the plate heat exchanger 3 are respectively connected with the first pipe 13 and the second pipe 14, and the ends of the first pipe 13 and the second pipe 14 away from the plate heat exchanger 3 are both connected with the copper filling pipe 8;

[0038] The solution in the copper dissolving tank 1 is circulated by the spray pump group 6 and the spray main pipe 7, and then the copper replenishing pipe 8 and the overflow pipe 4 are used to form a circulation pipeline with the low-level tank 2 and the copper dissolving tank 1. Under the transportation of the copper replenishing pump group 9, the solution in the low-level tank 2 is introduced into the copper dissolving tank 1, and then refluxed by the overflow pipe. At the same time, a plate heat exchanger 3 is arranged between the low-level tank 2 and the copper dissolving tank 1. The solutions in the copper dissolving tank 1 and the low-level tank 2 are respectively introduced into the plate heat exchanger 3 by the spray bypass pipe 11 and the first pipe 13 to realize heat exchange, which can not only greatly increase the temperature of the solution in the copper dissolving tank 1, but also reduce the temperature of the solution in the low-level tank 2, reduce the cooling pressure of the rear-end cooling water, make rational use of heat, and reduce energy consumption.

[0039] The spray bypass pipe 11 is connected to a detection pipe 15, one end of the detection pipe 15 away from the spray bypass pipe 11 is connected to the upper end of the copper dissolving tank 1, the detection pipe 15 is connected to a copper concentration detection device, and a second valve 16 is installed on the detection pipe 15 at the front end of the detection device. By connecting the detection pipe 15 with the copper concentration detection device on the spray main pipe 7, it is convenient to detect and record the solution concentration in the liquid storage tank 5.

[0040] The third valve 17, the high-concentration flowmeter 18 and the overflow automatic valve 19 are installed in sequence on the spray bypass pipe 11. The spray bypass pipe 11 around the high-concentration flowmeter 18 is made into a backwater bay shape. Through the cooperation of the third valve 17 and the second valve 16, it is convenient to control the flow direction of the solution passing through the first valve 10, realize the flow from different pipelines, and control the flow rate of the solution at the same time. If the flow rate is too large, it will impact the copper concentration detection equipment and the rear-end hose. The spray bypass pipe 11 around the high-concentration flowmeter 18 is designed to be a backwater bay shape, which can make the flow measurement accurate.

[0041] A fourth valve 20 is installed on the first pipeline 13, a fifth valve 21 is installed on the copper-replenishing pipeline 8, the fifth valve 21 is located between the first pipeline 13 and the second pipeline 14, and a sixth valve 22 is installed on the second pipeline 14. Through the setting of the fourth valve 20 and the fifth valve 21, it is convenient to control whether the solution in the copper-replenishing pipeline 8 passes through the plate flowmeter.

[0042] A copper replenishing flowmeter 23 and a copper replenishing automatic valve 24 are installed on the copper replenishing pipe 8. The copper replenishing flowmeter 23 and the copper replenishing automatic valve 24 are located at the upper end of the first pipe 13. The copper replenishing flowmeter 23 and the copper replenishing automatic valve 24 can be used to detect the liquid flow in the copper replenishing pipe 8, which is convenient for human intervention to achieve a relative balance between the circulation flow rates of the copper replenishing pipe 8 and the overflow pipe 4.

[0043] The copper dissolving tank 1 is provided with an overflow port 25 , which is connected to the liquid storage tank 5 , and the overflow pipe 4 is connected to the overflow port 25 . Through the setting of the overflow port 25 , physical overflow is adopted to guide the excess solution in the liquid storage tank 5 into the low-level tank 2 .

[0044] In order to facilitate cleaning and maintenance of the plate heat exchanger 3, a first drain pipe 26 and a second drain pipe 28 are provided.

[0045] The first pipeline 13 is connected to a first drain pipe 26 extending downward, and a first ball valve 27 is installed on the first drain pipe 26. The first drain pipe 26 is located between the fourth valve 20 and the plate heat exchanger 3. Through the arrangement of the first drain pipe 26 and the first ball valve 27, it is convenient to connect the first pipeline 13 to the outside and drain the residual liquid in the first pipeline 13.

[0046] The spray bypass pipe 11 is connected to a second drain pipe 28 extending downward, and a second ball valve 29 is installed on the second drain pipe 28. The second drain pipe 28 is located between the high-concentration flowmeter 18 and the third valve 17. The second drain pipe 28 and the second ball valve 29 are arranged to facilitate the release of the solution in the spray bypass pipe 11 and the cleaning and maintenance of the plate heat exchanger 3.

[0047] The position of the low-level tank 2 is lower than that of the copper-dissolving tank 1. A thermometer 30 is installed at the lower end of the sixth valve 22 on the second pipe 14. By setting the heights of the low-level tank 2 and the copper-dissolving tank 1, it is ensured that the excess solution in the copper-dissolving tank 1 automatically flows back to the low-level tank 2 along the overflow pipe 4 through the overflow port 25. At the same time, the thermometer 30 is installed on the second pipe 14 to detect the temperature of the solution flowing out of the plate heat exchanger 3, so as to control the flow rate of the solution by controlling the fourth valve 20 and the sixth valve 22, control the temperature within a certain range, and fully and reasonably recycle the heat.

[0048] Based on a device for recovering lost heat from a copper melting tank, a method for recovering lost heat from a copper melting tank is also provided, comprising the following steps:

[0049] S1, adding some copper materials with high copper content such as thick copper wire and copper plate to the upper end of the inner cavity of the copper dissolving tank 1;

[0050] S2, start the spray pump group 6, use the spray pump group 6 to transport the solution in the liquid storage tank 5 upward, and transport it from the spray main pipe 7 to the top of the copper dissolving tank 1 to react chemically with the copper material again, thereby increasing the copper concentration of the solution in the liquid storage tank 5. At the same time, start the copper replenishment pump group 9, and introduce the low-concentration copper sulfate solution returned from the electrolysis machine in the low-level tank 2 into the copper dissolving tank 1 through the copper replenishment pipeline 8, thereby increasing the amount of the solution in the liquid storage tank 5. At this time, the liquid level of the solution rises and flows back to the low-level tank 2 from the overflow pipeline 4;

[0051] S3. Connect the spray bypass pipe 11 with the spray main pipe 7, so that part of the high-temperature solution in the spray main pipe 7 is transported to the plate heat exchanger 3 by the spray pump group 6, and then refluxes to the overflow pipe 4 through the reflux pipe 12 and flows into the low-level tank 2. At the same time, the first pipe 13 and the second pipe 14 are connected as the main conveying channel of the copper-replenishing pipe 8, and the low-temperature solution in the low-level tank 2 flows into the heat exchanger, and heat exchange is realized inside the heat exchanger to increase the temperature of the solution in the copper-replenishing pipe 8. After the solution transported by the copper-replenishing pipe 8 enters the copper-dissolving tank 1, the reaction speed with the copper material is accelerated due to the increase in temperature, thereby avoiding the heat generated by the chemical reaction in the copper-dissolving tank 1 from being wasted.

[0052] Before the heat exchange system is operated, the low-temperature and low-concentration copper sulfate solution is extracted by the copper replenishment pump group 9, and is sent to the copper dissolving tank 1 along the copper replenishment pipeline 8 through the copper replenishment flowmeter 23, the copper replenishment automatic valve 24, the fifth valve 21, etc. At this time, the fourth valve 20 and the sixth valve 22 are closed; the liquid storage tank 5 in the copper dissolving tank 1 is extracted by the spray pump group 6, and most of the solution is sent to the top of the copper dissolving tank 1 along the spray main pipe 7, and a small part of the solution passes through the first valve 10 and the second valve 16, and is sent back to the top of the copper dissolving tank 1 along the detection pipeline 15 after concentration detection. The third valve 17 is closed at this time. The high-temperature and high-concentration copper sulfate solution in the liquid storage tank 5 is continuously replenished with the solution in the copper dissolving tank 1, and the part that overflows the liquid storage tank 5 flows out from the overflow port 25, along the overflow pipeline 4, and flows to the low-level tank 2, such as Figure 2 Solution flow direction is shown.

[0053] When the heat exchange system is running, the low-temperature and low-concentration copper sulfate solution is extracted by the copper replenishment pump group 9, and is sent to the copper dissolving tank 1 along the first pipeline 13, the second pipeline 14, and the copper replenishment pipeline 8 through the copper replenishment flowmeter 23, the copper replenishment automatic valve 24, the fourth valve 20, the plate heat exchanger 3, and the sixth valve 22. At this time, the fifth valve 21 is closed; the liquid storage tank 5 in the copper dissolving tank 1 is extracted by the spray pump group 6, and most of the solution is sent to the top of the copper dissolving tank 1 along the spray main pipe 7. A part of the solution passes through the first valve 10 and the second valve 16, and is sent back to the top of the copper dissolving tank 1 after concentration detection along the detection pipeline 15. A part of the solution passes through the third valve 17, the high-concentration liquid flowmeter 18, the overflow automatic valve 19, and the plate heat exchanger 3, along the spray bypass pipeline 11 and the reflux pipeline 12 to the overflow pipeline 4, and finally remains in the low-level tank 2. The control system detects the flow rate of the copper replenishment flowmeter 23 and compares it with the flow rate of the high-concentration solution flowmeter 18. The system automatically matches the opening of the overflow automatic valve 19 to make the flow rate of the copper replenishment solution consistent with that of the overflow solution. At this time, the high-temperature and high-concentration copper sulfate solution will not flow out from the overflow port 25 of the storage tank 5. Figure 3 Solution flow direction is shown.

[0054] After the low-temperature and low-concentration copper replenishment liquid passes through the heat exchange system, its temperature can theoretically be raised to the temperature of the high-temperature and high-concentration overflow liquid. In actual use, the temperature of the low-temperature and low-concentration copper replenishment liquid is about 56°C, and the temperature of the high-temperature and high-concentration overflow liquid is about 78°C. After passing through the heat exchange system, the temperature of the low-temperature and low-concentration copper replenishment liquid can rise to 70°C, and the temperature in the copper dissolving tank 1 can be increased by more than 10°C, thereby increasing the copper dissolving efficiency by 3-4 times, with obvious economic benefits.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for recovering heat lost from a copper melting tank, characterized in that: include: A copper dissolving tank (1), a low-level tank (2) and a plate heat exchanger (3); An overflow pipe (4) is connected between the copper dissolving tank (1) and the low-level tank (2); a liquid storage tank (5) is provided at the lower end of the inner cavity of the copper dissolving tank (1); and a reflux spray system is provided on the outer side of the copper dissolving tank (1); The reflux spray system comprises a spray pump group (6) and a spray main pipe (7), one end of the spray main pipe (7) is connected to the liquid storage tank (5) at the lower end of the copper dissolving tank (1), the other end of the spray main pipe (7) extends upward and is connected to the upper end of the copper dissolving tank (1), and the spray pump group (6) is installed on the spray main pipe (7); The top of the low-level tank (2) is connected to a copper-replenishing pipe (8), the other end of the copper-replenishing pipe (8) is connected to the upper end of the copper-dissolving tank (1), and a copper-replenishing pump group (9) is installed on the copper-replenishing pipe (8); The outside of the spray main pipe (7) is connected to a first valve (10); an end of the first valve (10) away from the spray main pipe (7) is connected to a spray bypass pipe (11); an end of the spray bypass pipe (11) away from the first valve (10) is connected to a high-temperature liquid inlet of the plate heat exchanger (3); a high-temperature liquid outlet of the plate heat exchanger (3) is connected to a return pipe (12); an end of the return pipe (12) away from the plate heat exchanger (3) is connected to an overflow pipe (4); a low-temperature liquid inlet and a low-temperature liquid outlet of the plate heat exchanger (3) are respectively connected to a first pipe (13) and a second pipe (14); and ends of the first pipe (13) and the second pipe (14) away from the plate heat exchanger (3) are both connected to a copper filling pipe (8); The spray bypass pipe (11) is connected to a detection pipe (15), one end of the detection pipe (15) away from the spray bypass pipe (11) is connected to the upper end of the copper dissolving tank (1), the detection pipe (15) is connected to a copper concentration detection device, and a second valve (16) is installed on the detection pipe (15) at the front end of the detection device; The spray bypass pipe (11) is sequentially installed with a third valve (17), a high-concentration flow meter (18) and an overflow automatic valve (19), and the spray bypass pipe (11) around the high-concentration flow meter (18) is made into a backwater bay shape; A fourth valve (20) is installed on the first pipe (13), a fifth valve (21) is installed on the copper-filled pipe (8), the fifth valve (21) is located between the first pipe (13) and the second pipe (14), and a sixth valve (22) is installed on the second pipe (14); The copper-replenishing pipeline (8) is provided with a copper-replenishing flowmeter (23) and a copper-replenishing automatic valve (24), and the copper-replenishing flowmeter (23) and the copper-replenishing automatic valve (24) are located at the upper end of the first pipeline (13); The copper dissolving tank (1) is provided with an overflow port (25), the overflow port (25) is connected to the liquid storage tank (5), and the overflow pipe (4) is connected to the overflow port (25); The following steps are also included: S1, adding thick copper wire and copper plate to the upper end of the inner cavity of the copper dissolving tank (1); S2, start the spray pump group (6), use the spray pump group (6) to transport the solution in the liquid storage tank (5) upward, and transport it from the spray main pipe (7) to the top of the copper dissolving tank (1) to react with the copper material again, thereby increasing the copper concentration of the solution in the liquid storage tank (5). At the same time, start the copper replenishment pump group (9), and introduce the low-concentration copper sulfate solution returned from the electrolysis machine in the low-level tank (2) into the copper dissolving tank (1) through the copper replenishment pipe (8), thereby increasing the amount of solution in the liquid storage tank (5). At this time, the liquid level of the solution rises and flows back to the low-level tank (2) from the overflow pipe (4); S3, connecting the spray bypass pipe (11) with the spray main pipe (7) so that part of the high-temperature solution in the spray main pipe (7) is transported to the inside of the plate heat exchanger (3), and then flows back to the overflow pipe (4) through the return pipe (12) and flows into the low-level tank (2). At the same time, the first pipe (13) and the second pipe (14) are connected as the main conveying channel of the copper supplement pipe (8), and the low-temperature solution in the low-level tank (2) flows into the heat exchanger, and heat exchange is realized inside the heat exchanger to increase the temperature of the solution in the copper supplement pipe (8). After the solution transported by the copper supplement pipe (8) enters the copper dissolving tank (1), the reaction speed with the copper material is accelerated due to the increase in temperature, thereby avoiding the heat generated by the chemical reaction in the copper dissolving tank (1) from being wasted; Before the heat exchange system is operated, a low-temperature, low-concentration copper sulfate solution is extracted by the copper replenishment pump group (9), and is sent to the copper dissolving tank (1) along the copper replenishment pipeline (8) through the copper replenishment flowmeter (23), the copper replenishment automatic valve (24), and the fifth valve (21). At this time, the fourth valve (20) and the sixth valve (22) are closed; the liquid storage tank (5) in the copper dissolving tank (1) is extracted by the spray pump group (6), and most of the solution is sent to the top of the copper dissolving tank (1) along the spray main pipe (7), and a small part of the solution passes through the first valve (10) and the second valve (16), and is sent back to the top of the copper dissolving tank (1) along the detection pipeline (15) after concentration detection. At this time, the third valve (17) is closed; the high-temperature, high-concentration copper sulfate solution in the liquid storage tank (5) is continuously replenished with the solution in the copper dissolving tank (1), and the part of the solution overflowing from the liquid storage tank (5) flows out from the overflow port (25), along the overflow pipeline (4), and flows into the low-level tank (2); When the heat exchange system is in operation, a low-temperature, low-concentration copper sulfate solution is extracted by the copper replenishment pump group (9), and is sent to the copper dissolving tank (1) along the first pipeline (13), the second pipeline (14), and the copper replenishment pipeline (8) through the copper replenishment flowmeter (23), the copper replenishment automatic valve (24), the fourth valve (20), the plate heat exchanger (3), and the sixth valve (22). At this time, the fifth valve (21) is closed; the liquid storage tank (5) in the copper dissolving tank (1) is extracted by the spray pump group (6), and most of the solution is sent to the top of the copper dissolving tank (1) along the spray main pipe (7), and a part of the solution passes through the first valve (10) and the second valve (16) and along the detection pipeline ( 15) After the concentration is detected, it is sent back to the top of the copper dissolving tank (1), and a part of it passes through the third valve (17), the high concentration flow meter (18), the overflow automatic valve (19), the plate heat exchanger (3), along the spray bypass pipe (11), the reflux pipe (12) to the overflow pipe (4), and finally stays in the low-level tank (2). The control system detects the flow of the copper replenishment flow meter (23) and compares it with the flow of the high concentration flow meter (18). The system automatically matches the opening of the overflow automatic valve (19) to make the flow of the copper replenishment solution consistent with that of the overflow solution. At this time, the high-temperature and high-concentration copper sulfate solution will not flow out from the overflow port (25) of the storage tank (5).

2. The method for recovering lost heat from a copper dissolving tank according to claim 1, characterized in that: The first pipeline (13) is connected to a first liquid discharge pipe (26) extending downwards, a first ball valve (27) is installed on the first liquid discharge pipe (26), and the first liquid discharge pipe (26) is located between the fourth valve (20) and the plate heat exchanger (3).

3. The method for recovering lost heat from a copper dissolving tank according to claim 1, characterized in that: The spray bypass pipe (11) is connected to a second liquid discharge pipe (28) extending downwards, a second ball valve (29) is installed on the second liquid discharge pipe (28), and the second liquid discharge pipe (28) is located between the high-concentration flow meter (18) and the third valve (17).

4. The method for recovering lost heat from a copper dissolving tank according to claim 1, characterized in that: The position of the low-level tank (2) is lower than that of the copper dissolving tank (1), and a thermometer (30) is installed on the second pipeline (14) at the lower end of the sixth valve (22).

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