A device and method for gradient separation of spent tin-plated copper strip by hot process

Abstract

This invention discloses a thermal gradient separation device and method for waste tin-plated copper strip, relating to the field of tin-plated copper strip separation technology. It includes a fixed base plate, a separation unit fixedly mounted on the fixed base plate, a screening unit fixedly mounted on the separation unit, and a combustion unit fixedly mounted on the fixed base plate, with the combustion unit fixedly connected to the separation unit. This invention achieves preliminary separation of copper and lead-tin alloys by utilizing the difference in metal melting points, followed by deep purification of lead and tin through vacuum distillation. The entire process is free of impurities, resulting in extremely high purity of the recovered copper, tin, and lead. It also avoids the loss of copper and waste of lead in wet processes, achieving efficient recovery of the three metals and improving resource utilization. The nitrogen inert atmosphere effectively isolates oxygen, preventing metal oxidation and maintaining the pure metal state of the recovered materials. Furthermore, nitrogen can be recycled for heating, reducing energy consumption and improving resource recovery efficiency.

Description

Technical Field

[0001] This invention relates to the field of waste tin-plated copper strip separation technology, and in particular to a thermal gradient separation device and method for waste tin-plated copper strip. Background Technology

[0002] Tin-plated copper strip is a key connector between new energy batteries. The scrap rate during its production process is about 3%, and the waste generated is classified as general industrial solid waste. The waste is pure copper inside and coated with tin and lead on the outside. Because it is rich in a variety of precious metals, it has extremely high economic value and resource recycling potential.

[0003] Currently, the mainstream recycling process for this type of waste is wet stripping followed by electrolytic recovery of metallic tin. However, this process has significant drawbacks. Copper loss or incomplete stripping is easily caused during the chemical stripping process, resulting in low purity of the recovered metal. At the same time, the tin recovery rate is poor, and effective lead recovery cannot be achieved, leading to resource waste and failing to meet the demand for efficient resource utilization. Summary of the Invention

[0004] In view of the problems existing in the above-mentioned thermal gradient separation device and processing method for waste tin-plated copper strip, the present invention is proposed.

[0005] Therefore, the present invention provides a thermal gradient separation device and method for waste tin-plated copper strips, the purpose of which is to solve the problem that chemical tin removal easily causes copper loss or incomplete tin removal, resulting in low recycling purity and failure to effectively recover lead, thus causing resource waste.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a thermal gradient separation device for waste tin-plated copper strip, comprising a fixed base plate, a separation unit fixedly mounted on the fixed base plate, a screening unit fixedly mounted on the separation unit, and a combustion unit fixedly mounted on the fixed base plate, wherein the combustion unit is fixedly connected to the separation unit; the separation unit comprises a separation component fixedly mounted on the fixed base plate; the combustion unit comprises a heating component fixedly mounted on the fixed base plate, wherein the heating component is fixedly connected to the separation component; the screening unit comprises a screening component fixedly mounted on the separation component, wherein the screening component is fixedly connected to the fixed base plate.

[0007] As a preferred embodiment of the waste tin-plated copper strip thermal gradient separation device of the present invention, the separation component includes a separation shell fixedly installed on a fixed base plate, a conveying component fixedly installed on the separation shell, and an output component fixedly installed at the other end of the separation shell, wherein the conveying component is fixedly connected to the heating component.

[0008] As a preferred embodiment of the waste tin-plated copper strip thermal gradient separation device of the present invention, an air inlet pipe is fixedly installed on the separation shell, and an air outlet pipe is fixedly installed on the separation shell, and the air inlet pipe and the air outlet pipe cooperate with each other.

[0009] As a preferred embodiment of the waste tin-plated copper strip thermal gradient separation device of the present invention, the heating component includes a connector fixedly installed on a fixed base plate, a conveying fan fixedly installed on the connector, and a nitrogen conveying pipe fixedly installed at the output end of the connector, wherein the nitrogen conveying pipe is fixedly connected to the conveying component.

[0010] As a preferred embodiment of the waste tin-plated copper strip thermal gradient separation device of the present invention, a nitrogen conveying component is fixedly installed on the top of the conveying fan, a nitrogen recovery component is fixedly installed on the fixed base plate, and the nitrogen recovery component is connected to the connecting component.

[0011] In a preferred embodiment of the waste tin-plated copper strip thermal gradient separation device of the present invention, a recovery connection port is fixedly installed at the other end of the nitrogen recovery component, and the recovery connection port is fixedly connected to the material conveying component.

[0012] As a preferred embodiment of the waste tin-plated copper strip thermal gradient separation device of the present invention, a fire tube heating element is fixedly installed on the inner wall of the separation shell, a combustion nozzle is fixedly installed on the fire tube heating element, and the combustion nozzle is fixedly connected to the inner wall of the separation shell, while the combustion nozzle is connected to a nitrogen delivery pipe.

[0013] As a preferred embodiment of the waste tin-plated copper strip thermal gradient separation device of the present invention, the screening component includes a separation screen fixedly installed at the bottom of the separation shell, and a lead-tin alloy discharge pipe fixedly installed on the separation screen.

[0014] As a preferred embodiment of the waste tin-plated copper strip thermal gradient separation device of the present invention, a separation plate is fixedly installed inside the separation screen, the separation plate is provided with screening holes, and the separation plate cooperates with the output component.

[0015] The beneficial effects of the first technical solution of this invention are as follows: This invention achieves the initial separation of copper and lead-tin alloy by utilizing the difference in metal melting points, and then completes the deep purification of lead and tin through vacuum distillation. No impurities are introduced throughout the process, resulting in extremely high purity of the recovered copper, tin, and lead. At the same time, it avoids the loss of copper and the waste of lead in the wet process, achieving efficient recovery of the three metals and improving resource utilization. The nitrogen inert atmosphere can effectively isolate oxygen, prevent metal oxidation, keep the recovered materials in a pure metal state, and nitrogen can be recycled for heating, reducing energy consumption and improving resource recovery efficiency.

[0016] To solve the above-mentioned technical problems, the second technical solution provided by the present invention is as follows: a thermal gradient separation device for waste tin-plated copper strip and its baking method, wherein the method comprises: S1: First, pre-treatment is carried out by selecting tin-plated copper strip waste with pure copper inside and tin and lead plating on the outside, and removing impurities and oil stains from the surface of the waste. S2: Then, nitrogen is delivered to the fire tube heater through the nitrogen delivery unit, and the fire tube heater heats it. The fire tube heater has a vertical or horizontal structure, with a nitrogen delivery pipe inside and a shell outside. The two ends of the nitrogen delivery pipe are fixed by tube sheets, and the outside of the pipe is a natural gas heating chamber. Nitrogen is introduced into the nitrogen delivery pipe. S3: The pre-treated tin-plated copper strip waste is fed in from the conveyor. Hot nitrogen is sent to the inside of the separation shell through the nitrogen conveyor. Then, with the cooperation of the fire tube heating element and the combustion nozzle, it flows into contact with the waste, heating the waste to the melting point of the lead-tin alloy and burning it inside the separation shell. The entire separation shell tilts from the conveyor to the output element, controlling the residence time of the waste at the top of the screening component, so that the lead-tin alloy is fully melted and peeled off from the surface of the copper strip. S4: The molten lead-tin alloy slurry and hot nitrogen gas fall together into the screening component at the bottom of the separation shell. Due to its high density, the lead-tin alloy melt settles to the bottom of the screening component. The high-purity copper strip after the lead-tin alloy is stripped is discharged from the output component in the separation shell. S5: Then the lead-tin alloy melt at the bottom of the screening component is sent into the vacuum distillation system. By utilizing the difference in boiling points between lead and tin, the lead and tin are deeply separated, and high-purity lead and tin are collected separately. S6: The nitrogen gas discharged from the final screening component is returned to the heating component for reheating through the nitrogen recovery unit and recycled for the gradient heating separation process in step 3.

[0017] The beneficial effects of the second technical solution of this invention are as follows: This method achieves the separation of copper and lead-tin by controlling the difference in melting point and the separation of lead-tin by controlling the difference in boiling point. The entire process is free of chemical reagents and impurities, resulting in high purity of recovered copper, tin, and lead, meeting the needs of high-value resource utilization. At the same time, it avoids the loss of copper and waste of lead in wet processes, improves resource utilization and reduces solid waste pollution. Meanwhile, the nitrogen inert atmosphere runs through the entire separation process, effectively isolating oxygen to prevent metal oxidation and keeping the recovered materials in a pure metal state. Furthermore, nitrogen can be recycled for heating to reduce energy consumption. The absence of chemical reagents avoids reagent pollution and subsequent processing costs, enhancing the practicality of separation and recovery. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the working process of the thermal gradient separation device for waste tin-plated copper strips of the present invention.

[0020] Figure 2 This is a front structural schematic diagram of the waste tin-plated copper strip thermal gradient separation device of the present invention.

[0021] Figure 3 This is a schematic diagram of the separation unit structure of the waste tin-plated copper strip thermal gradient separation device of the present invention.

[0022] Figure 4 This is a schematic diagram of the thermal separation screen structure of the waste tin-plated copper strip thermal gradient separation device of the present invention.

[0023] Figure 5 This is a schematic diagram of the fire tube heating assembly of the waste tin-plated copper strip thermal gradient separation device of the present invention.

[0024] Figure 6 This is a schematic diagram of the combustion nozzle structure of the thermal gradient separation device for waste tin-plated copper strips of the present invention.

[0025] Explanation of reference numerals in the attached drawings: 1. Fixed base plate; 2. Separation unit; 21. Separation component; 211. Separation shell; 212. Conveying component; 213. Output component; 214. Air inlet pipe; 215. Air outlet pipe; 3. Combustion unit; 31. Heating component; 311. Connecting component; 312. Conveying fan; 313. Nitrogen conveying component; 314. Nitrogen conveying pipe; 315. Fire tube heating component; 316. Combustion nozzle; 317. Nitrogen recovery component; 318. Recovery connection port; 4. Screening unit; 41. Screening component; 411. Separating screen; 412. Lead-tin alloy discharge pipe; 413. Separating plate; 414. Screening hole. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Example 1, referring to Figure 1 - Figure 2The first embodiment of the present invention provides a waste tin-plated copper strip thermal gradient separation device. The device includes: a fixed base plate 1, and a separation unit 2 fixedly installed on the fixed base plate 1 for recycling the waste tin-plated copper after heating and combustion; a screening unit 4 fixedly installed on the separation unit 2 for separating and recycling the waste tin-plated copper; and a combustion unit 3 fixedly installed on the fixed base plate 1, and the combustion unit 3 is fixedly connected to the separation unit 2 and cooperates with the separation unit 2 for combustion.

[0028] The separation unit 2 includes a separation component 21 fixedly mounted on a fixed base plate 1 for collecting and preparing waste for combustion. The combustion unit 3 includes a heating component 31 fixedly mounted on the fixed base plate 1 and fixedly connected to the separation component 21. The heating component 31 burns and melts the waste inside the separation component 21 and conveys the melted waste to the screening component 41. The screening unit 4 includes a screening component 41 fixedly mounted on the separation component 21 and fixedly connected to the fixed base plate 1. The screening component 41 separates the waste melted by the heating component 31 inside the separation component 21 and then recycles it.

[0029] During operation, waste material first enters from the input end of the separation component 21. Then, the heating component 31 starts working, preheating the interior of the separation component 21. Nitrogen gas is gradually supplied through the heating component 31, causing the combustion temperature inside the separation component 21 to gradually increase until all the waste material inside the separation component 21 melts together. Simultaneously, the melted waste material is conveyed to the screening component 41. The screening component 41 separates the waste material into layers, and, in conjunction with the separation of copper and lead-tin, utilizes the difference in boiling points to achieve a gradient design for lead-tin separation. The entire process requires no chemical reagents and introduces no impurities, resulting in high purity recovered copper, tin, and lead, meeting the needs of high-value resource utilization. It also avoids the loss of copper and waste of lead found in wet processes, achieving efficient recovery of the three metals. Furthermore, nitrogen gas can be recycled for heating to reduce energy consumption, and the elimination of chemical reagents avoids reagent pollution and subsequent processing costs, enhancing the practicality of the separation and recovery process.

[0030] Example 2, refer to Figure 1 - Figure 5 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the separation component 21 includes a separation shell 211 fixedly installed on the fixed base plate 1 for preliminary storage and combustion of waste materials, a conveying component 212 fixedly installed on the separation shell 211 for continuous conveying of waste materials, and an output component 213 fixedly installed at the other end of the separation shell 211. In addition, the conveying component 212 is fixedly connected to the heating component 31 for recycling and outputting the tin after the waste separation is completed.

[0031] Compared to Embodiment 1, in a further embodiment, an air inlet pipe 214 is fixedly installed on the separation shell 211 to cooperate with combustion air intake. At the same time, an air outlet pipe 215 is also fixedly installed on the separation shell 211, and the air inlet pipe 214 and the air outlet pipe 215 cooperate with each other to exhaust air after combustion and melting are completed.

[0032] Furthermore, the heating assembly 31 includes a connector 311 fixedly mounted on the fixed base plate 1 for supporting and fixing the conveying fan 312; it also includes the conveying fan 312 fixedly mounted on the connector 311 for conveying nitrogen; and a nitrogen conveying pipe 314 fixedly mounted on the output end of the connector 311. The nitrogen conveying pipe 314 is fixedly connected to the conveying component 212 for conveying nitrogen into the separation shell 211 to cooperate with combustion.

[0033] Furthermore, a nitrogen conveying component 313 is fixedly installed on the top of the conveying fan 312 for connecting external nitrogen and conveying nitrogen into the conveying fan 312. At the same time, it works with the nitrogen conveying pipe 314 to convey nitrogen into the separation shell 211. A nitrogen recovery component 317 is fixedly installed on the fixed base plate 1 and is connected to the connecting component 311 to cool and recover the nitrogen after combustion.

[0034] Furthermore, a recovery connection port 318 is fixedly installed at the other end of the nitrogen recovery component 317, and the recovery connection port 318 is fixedly connected to the conveying component 212 to cooperate with the nitrogen recovery component 317 to recover the nitrogen after combustion.

[0035] Furthermore, a fire tube heating element 315 is fixedly installed on the inner wall of the separation shell 211 for conveying the flame. A combustion nozzle 316 is fixedly installed on the fire tube heating element 315 and is fixedly connected to the inner wall of the separation shell 211. At the same time, the combustion nozzle 316 is connected to the nitrogen delivery pipe 314. The fire tube heating element 315 and the combustion nozzle 316 work together to burn the waste inside the separation shell 211, and at the same time, work together with the nitrogen delivered by the nitrogen delivery pipe 314 to perform staged combustion.

[0036] Furthermore, the screening assembly 41 includes a separation screen 411 fixedly installed at the bottom of the separation housing 211 for collecting the waste that has been burned into liquid state, and a lead-tin alloy discharge pipe 412 fixedly installed on the separation screen 411 for discharging the lead-tin alloy in the liquid waste.

[0037] Furthermore, a separation plate 413 is fixedly installed inside the separation screen 411 for separating liquid waste. The separation plate 413 is provided with screening holes 414, and the separation plate 413 cooperates with the output component 213. The separation of copper and lead-tin alloy is achieved by using the screening holes 414 in combination with the difference in metal melting points. Then, the deep purification of lead and tin is completed by vacuum distillation. No impurities are introduced throughout the process, which can improve the purity of the recovered copper, tin and lead.

[0038] During operation, tin-plated copper strip waste, with a pure copper interior and tin and lead plating on the exterior, is first fed into the separation shell 211 via the conveyor 212. Next, the fire tube heater 315 begins heating, while the combustion nozzle 316 sprays flames from the fire tube heater 315 to burn the waste inside the separation shell 211. Simultaneously, the nitrogen conveyor 313 on the connector 311 begins conveying external nitrogen to the conveying fan 312, which further conveys the nitrogen to the nitrogen conveying pipe 314. The nitrogen is then preheated through the nitrogen conveying pipe 314, ensuring it reaches a certain temperature before entering the separation shell 211. Inside the separator 211, nitrogen gas combines with the flame emitted from the combustion nozzle 316. The nitrogen gas raises the combustion temperature of the combustion nozzle 316, causing the waste inside the separator 211 to burn and melt, turning the waste into a liquid state. This liquid is then transported to the separator 411, where the separator plate 413 and the screening holes 414 work together to separate the liquid waste. Due to the high density of the lead-tin alloy melt, it settles to the bottom of the screening holes 414. The high-purity copper strip, after the lead-tin alloy is stripped, is discharged from the output 213.

[0039] Next, by utilizing the boiling point difference between lead and tin at the bottom of the separation plate 413, deep separation of lead and tin is achieved, and high-purity lead and tin are collected separately.

[0040] Finally, the nitrogen discharged from the lead-tin alloy discharge pipe 412 is returned to the conveying fan 312 via the nitrogen recovery unit 317 for reheating, and the gradient heating separation process is repeated. This process effectively isolates oxygen, prevents metal oxidation, and keeps the recovered material in a pure metallic state. Moreover, the nitrogen can be recycled for heating, reducing energy consumption, eliminating the need for chemical reagents, avoiding reagent pollution and subsequent processing costs, and enhancing the practicality of the separation and recovery process.

[0041] The remaining structure is the same as that in Example 1.

[0042] Example 3, referring to Figure 1 - Figure 6This is the fourth embodiment of the present invention. Based on the above two embodiments, this embodiment proposes a thermal gradient separation device and method for waste tin-plated copper strip. The method includes: firstly, pretreatment is performed by selecting tin-plated copper strip waste with pure copper inside and tin and lead plating on the outside, and removing impurities and oil stains from the surface of the waste. Next, nitrogen is transported to the fire tube heater 315 through a nitrogen conveying component 313, and the fire tube heater 315 heats the nitrogen. The fire tube heater 315 has a vertical or horizontal structure, with a nitrogen conveying pipe 314 inside and a shell outside. The two ends of the nitrogen conveying pipe 314 are fixed by tube sheets, and the outside of the pipe is a natural gas heating chamber. Nitrogen is introduced into the nitrogen conveying pipe 314.

[0043] Further, the pretreated tin-plated copper strip waste is fed in through the conveyor 212, and hot nitrogen is delivered to the interior of the separation shell 211 through the nitrogen conveyor 313. Subsequently, under the synergistic action of the fire tube heater 315 and the combustion nozzle 316, the hot nitrogen flows into contact with the waste, heating it to the melting point of the lead-tin alloy, and burning it inside the separation shell 211. The separation shell 211 is tilted from the conveyor 212 to the output 213 to control the residence time of the waste at the top of the screening assembly 41, allowing the lead-tin alloy to fully melt and peel off from the copper strip surface.

[0044] Furthermore, the molten lead-tin alloy slurry, along with hot nitrogen gas, falls into the screening assembly 41 at the bottom of the separation shell 211. Due to the high density of the lead-tin alloy melt, it settles to the bottom of the screening assembly 41, while the high-purity copper strip after stripping the lead-tin alloy is discharged from the output component 213 in the separation shell 211.

[0045] Furthermore, the lead-tin alloy melt at the bottom of the screening component 41 is fed into a vacuum distillation system. By utilizing the difference in boiling points between lead and tin, deep separation of lead and tin is achieved, and high-purity lead and tin are collected separately.

[0046] Furthermore, finally, the nitrogen discharged from the screening component 41 is returned to the heating component 31 for reheating through the nitrogen recovery component 317, and the gradient heating separation process is repeated.

[0047] The processing method is as follows: First, pretreatment is carried out by selecting tin-plated copper strip waste with pure copper inside and tin and lead plating on the outside, and removing impurities and oil stains from the surface of the waste. Then, nitrogen is transported to the fire tube heating element 315 through the nitrogen conveying component 313. The fire tube heating element 315 heats the nitrogen. The fire tube heating element 315 has a vertical or horizontal structure. It has a nitrogen conveying pipe 314 inside and a shell outside. The two ends of the nitrogen conveying pipe 314 are fixed by the tube plate. The outside of the pipe is a natural gas heating chamber. Nitrogen is introduced into the nitrogen conveying pipe 314.

[0048] The pre-treated tin-plated copper strip waste is fed into the conveyor 212. Hot nitrogen is sent to the separation shell 211 through the nitrogen conveyor 313. Then, under the synergistic action of the fire tube heating element 315 and the combustion nozzle 316, the hot nitrogen flows into contact with the waste, heating the waste to the melting point of the lead-tin alloy and burning it inside the separation shell 211. The separation shell 211 is tilted from the conveyor 212 to the output element 213 to control the residence time of the waste at the top of the screening component 41, so that the lead-tin alloy is fully melted and peeled off from the surface of the copper strip. The molten lead-tin alloy slurry and hot nitrogen fall together into the screening component 41 at the bottom of the separation shell 211.

[0049] Because the lead-tin alloy melt has a high density, it will settle to the bottom of the screening component 41. The high-purity copper strip after the lead-tin alloy is stripped is discharged from the output component 213 in the separation shell 211. Then, the lead-tin alloy melt at the bottom of the screening component 41 is sent to the vacuum distillation system. By utilizing the difference in boiling points between lead and tin, deep separation of lead and tin is achieved, and high-purity lead and tin are collected separately. Finally, the nitrogen gas discharged from the screening component 41 is returned to the heating component 31 through the nitrogen recovery component 317 for reheating, and the gradient heating separation process is repeated.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A thermal gradient separation device for waste tin-plated copper strip, characterized in that: It includes a fixed base plate (1), a separation unit (2) fixedly installed on the fixed base plate (1), a screening unit (4) fixedly installed on the separation unit (2), and a combustion unit (3) fixedly installed on the fixed base plate (1), and the combustion unit (3) is fixedly connected to the separation unit (2); The separation unit (2) includes a separation component (21) fixedly installed on the fixed base plate (1); the combustion unit (3) includes a heating component (31) fixedly installed on the fixed base plate (1), and the heating component (31) is fixedly connected to the separation component (21); the screening unit (4) includes a screening component (41) fixedly installed on the separation component (21), and the screening component (41) is fixedly connected to the fixed base plate (1).

2. The thermal gradient separation device for waste tin-plated copper strip according to claim 1, characterized in that: The separation assembly (21) includes a separation shell (211) fixedly mounted on a fixed base plate (1), a conveying component (212) fixedly mounted on the separation shell (211), and an output component (213) fixedly mounted on the other end of the separation shell (211), and the conveying component (212) is fixedly connected to the heating assembly (31).

3. The thermal gradient separation device for waste tin-plated copper strip according to claim 2, characterized in that: An air inlet pipe (214) is fixedly installed on the separation shell (211), and an air outlet pipe (215) is fixedly installed on the separation shell (211), with the air inlet pipe (214) and the air outlet pipe (215) cooperating.

4. The thermal gradient separation device for waste tin-plated copper strip according to claim 3, characterized in that: The heating assembly (31) includes a connector (311) fixedly mounted on a fixed base plate (1), a conveying fan (312) fixedly mounted on the connector (311), and a nitrogen conveying pipe (314) fixedly mounted on the output end of the connector (311), and the nitrogen conveying pipe (314) is fixedly connected to the conveying component (212).

5. The thermal gradient separation device for waste tin-plated copper strip according to claim 4, characterized in that: A nitrogen conveying component (313) is fixedly installed on the top of the conveying fan (312), and a nitrogen recovery component (317) is fixedly installed on the fixed base plate (1), and the nitrogen recovery component (317) is connected to the connecting component (311).

6. The thermal gradient separation device for waste tin-plated copper strip according to claim 5, characterized in that: The other end of the nitrogen recovery component (317) is fixedly installed with a recovery connection port (318), and the recovery connection port (318) is fixedly connected to the conveying component (212).

7. The thermal gradient separation device for waste tin-plated copper strip according to claim 6, characterized in that: A fire tube heater (315) is fixedly installed on the inner wall of the separation shell (211). A combustion nozzle (316) is fixedly installed on the fire tube heater (315), and the combustion nozzle (316) is fixedly connected to the inner wall of the separation shell (211). At the same time, the combustion nozzle (316) is connected to the nitrogen delivery pipe (314).

8. The thermal gradient separation device for waste tin-plated copper strip according to claim 7, characterized in that: The screening assembly (41) includes a separation screen (411) fixedly installed at the bottom of the separation housing (211) and a lead-tin alloy discharge pipe (412) fixedly installed on the separation screen (411).

9. The thermal gradient separation device for waste tin-plated copper strip according to claim 8, characterized in that: A separation plate (413) is fixedly installed inside the separation screen (411). The separation plate (413) has screening holes (414) inside, and the separation plate (413) cooperates with the output component (213).

10. A separation method based on the thermal gradient separation device for waste tin-plated copper strips as described in claim 9, characterized in that: S1: First, pre-treatment is carried out by selecting tin-plated copper strip waste with pure copper inside and tin and lead plating on the outside, and removing impurities and oil stains from the surface of the waste. S2: Then nitrogen is delivered to the fire tube heater (315) through the nitrogen delivery component (313), and the fire tube heater (315) heats it. At the same time, the fire tube heater (315) is a vertical or horizontal structure, with a nitrogen delivery pipe (314) inside and a shell outside. The two ends of the nitrogen delivery pipe (314) are fixed by tube sheets, and the outside of the pipe is a natural gas heating chamber. Nitrogen is introduced into the nitrogen delivery pipe (314). S3: The pre-treated tin-plated copper strip waste is fed in from the conveyor (212), and hot nitrogen is sent to the inside of the separation shell (211) through the nitrogen conveyor (313). Then, with the cooperation of the fire tube heating element (315) and the combustion nozzle (316), the waste is brought into contact with the flow, so that the waste is heated to the melting point of the lead-tin alloy and burned inside the separation shell (211). The separation shell (211) is tilted from the conveyor (212) to the output element (213) to control the residence time of the waste at the top of the screening component (41) so that the lead-tin alloy is fully melted and peeled off from the surface of the copper strip. S4: The molten lead-tin alloy slurry and hot nitrogen gas fall together into the screening component (41) at the bottom of the separation shell (211). Due to its high density, the lead-tin alloy melt settles to the bottom of the screening component (41). The high-purity copper strip after stripping the lead-tin alloy is discharged from the output component (213) in the separation shell (211). S5: Then the lead-tin alloy melt at the bottom of the screening component (41) is sent into the vacuum distillation system. By utilizing the difference in boiling points between lead and tin, the deep separation of lead and tin is achieved, and high-purity lead and tin are collected respectively. S6: The nitrogen gas discharged from the final screening component (41) is returned to the heating component (31) for reheating via the nitrogen recovery component (317) and recycled for the gradient heating separation process in step 3.

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