Recovery device

Abstract

The utility model provides a recycling device which comprises a recycling body, a heating device, a heating device, a heating device and a heating device, and the recycling body is rotatably arranged around a preset axis and is internally provided with a heating chamber; the first heating component is arranged on the recovery body, at least part of the first heating component is attached to the recovery body so as to heat the tinned copper material in the heating cavity, tin is heated to be in a molten state, and the tin in the molten state is thrown to the inner wall face of the heating cavity under the action of centrifugal force through rotation of the recovery body; one end of the backflow pipeline communicates with the discharging opening, the other end of the backflow pipeline communicates with the storage groove, and the molten tin in the heating cavity flows into the storage groove through the backflow pipeline to be stored; and at least part of the second heating component is attached to the backflow pipeline so that the backflow pipeline can be heated, and tin in the backflow pipeline can be kept in a molten state. The problem that in the prior art, metal tin can only be reused after being treated again after being recycled is solved.

Description

Technical Field

[0001] This utility model relates to the field of tin recycling technology, and more specifically, to a recycling device. Background Technology

[0002] Tin-plated copper strip is a key material in high-end manufacturing fields such as electronic packaging and photovoltaic soldering. Its production inevitably generates slitting waste wire. These waste wires have a high-purity tin layer (tin content typically greater than 99.9%) on their surface, and directly discarding them would result in a huge waste of precious metal resources. According to current technology research, tin recycling mainly employs chemical dissolution, electrolysis, and high-temperature smelting methods.

[0003] Specifically:

[0004] Chemical dissolution method: The tin layer is leached out using acidic or alkaline solutions, but it has problems such as slow reaction rate (usually several hours), generation of harmful waste, and easy corrosion of the copper substrate.

[0005] Electrolysis: This method separates tin through electrochemical action, but it has high energy consumption (up to 615.2 joules per treatment) and produces electrolytic waste liquid containing heavy metals. During the process, copper strips must be used as the anode, and long-term electrolysis can damage the copper substrate structure.

[0006] High-temperature smelting method: Traditional technology uses rotary kilns or smelting furnaces to volatilize tin at high temperatures of 950-1350℃. Although the recovery rate can reach 82%, it has problems such as huge energy consumption, short equipment life, the need for a complex condensation system for tin vapor, and the easy oxidation of the copper matrix at high temperatures.

[0007] In addition, in traditional methods, the recovered tin metal often needs to be remelted before it can be reused, which increases processing costs. Utility Model Content

[0008] The main objective of this invention is to provide a recycling device to solve the problem in the prior art that tin metal needs to be processed again before it can be reused after recycling.

[0009] To achieve the above objectives, according to one aspect of the present invention, a recycling device is provided, comprising: a recycling body rotatably disposed about a predetermined axis, the recycling body having a heating chamber for containing tin-plated copper material; a first heating component disposed on the recycling body, at least a portion of the first heating component being in contact with the recycling body to heat the tin-plated copper material in the heating chamber, heating the tin to a molten state, and by rotating the recycling body, the molten tin is thrown onto the inner wall surface of the heating chamber under centrifugal force; a discharge port disposed on the recycling body, through which the molten tin in the heating chamber is discharged; a return pipe, one end of which is connected to the discharge port and the other end of which is connected to a storage tank, through which the molten tin in the heating chamber flows into the storage tank for storage; and a second heating component, at least a portion of which is in contact with the return pipe to heat the return pipe, keeping the tin in the return pipe in a molten state.

[0010] Furthermore, the recycling device also includes a flow guide section disposed on the inner wall of the heating chamber, the flow guide section being connected to the discharge port to guide molten tin to the discharge port.

[0011] Furthermore, the guiding section includes: a first guiding section disposed on the side wall of the heating chamber, the first guiding section extending along the height direction of the recycling body; and a second guiding section disposed on the bottom wall of the heating chamber, at least a portion of the second guiding section extending along the circumferential direction of the recycling body, and the second guiding section communicating with the first guiding section and the discharge port respectively, the molten tin flowing to the discharge port under the guiding action of the first guiding section and the second guiding section.

[0012] Furthermore, the first guiding section includes: a plurality of first guiding grooves disposed on the inner wall surface of the heating chamber for guiding the molten tin on the inner wall surface of the heating chamber; the horizontal distance between the two opposite groove walls of each first guiding groove gradually decreases from the groove opening to the groove bottom surface.

[0013] Furthermore, each of the first guide channels extends along the height direction of the recovery body, and multiple first guide channels are arranged sequentially along the circumferential direction of the recovery body; or, each of the first guide channels extends along the height direction of the recovery body in a spiral trajectory.

[0014] Furthermore, the second guiding section includes a second guiding channel disposed on the bottom surface of the heating chamber. The second guiding channel extends along the circumferential direction of the recycling body. The second guiding channel is connected to the first guiding section and the discharge port respectively, so as to guide the molten tin in the first guiding section to the discharge port.

[0015] Furthermore, the storage tank is equipped with a feed inlet, which is positioned lower than the discharge outlet, so that the molten tin, under its own gravity, flows into the storage tank through the return pipe.

[0016] Furthermore, an installation cavity is provided in the side wall of the recovery body, the installation cavity extends along the height direction of the recovery body, and at least a portion of the first heating component is disposed in the installation cavity.

[0017] Furthermore, the recovery body is provided with an air inlet and an air outlet, and the recovery device also includes an air supply component, which is connected to the air inlet to introduce inert gas into the recovery body, and the inert gas is discharged through the air outlet.

[0018] Furthermore, the recycling device also includes a drive assembly disposed below the recycling body. The drive assembly includes a drive shaft rotatable about its own axis, the drive shaft being driven to rotate the recycling body.

[0019] The recycling device of this application, utilizing the technical solution of this utility model, is equipped with a reflux pipe. One end of the reflux pipe is connected to the discharge port, and the other end is connected to the storage tank. Molten tin in the heating chamber flows into the storage tank through the reflux pipe for storage. A second heating component is installed on the reflux pipe, with at least a portion of the second heating component in contact with the reflux pipe to heat the reflux pipe, keeping the tin in the reflux pipe in a molten state. By setting up the reflux pipe, molten tin is directly guided from the heating chamber to the storage tank or other production stages, avoiding the process of remelting tin metal after cooling. This not only reduces energy consumption but also saves time and labor costs, achieving continuous production and improving production efficiency. The second heating component configured on the reflux pipe can heat the pipe in real time, ensuring that the molten tin in the pipe remains in a molten state. This design effectively overcomes the problem of tin metal easily crystallizing at room temperature in traditional recycling methods, ensuring the fluidity of the molten tin, avoiding blockage or solidification, and allowing the tin metal to flow smoothly back to the production line, reducing maintenance costs. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic diagram of an embodiment of the recycling device according to the present invention is shown;

[0022] Figure 2 A top cross-sectional view of the recycling device according to the present invention is shown;

[0023] Figure 3 An axial cross-sectional view of the recycling device according to the present invention is shown;

[0024] Figure 4A schematic diagram of the structure of the first guide channel of the recycling device according to the present invention is shown;

[0025] Figure 5 A schematic diagram of the structure of the first heating component of the recycling device according to the present invention is shown.

[0026] The above figures include the following reference numerals:

[0027] 100. Recover the main body; 101. Heating chamber; 102. Installation chamber;

[0028] 200, First heating component; 300, discharge port; 400, return pipe; 500, storage tank; 700, flow guide; 710, first flow guide; 720, second flow guide; 711, first flow guide channel; 721, second flow guide channel; 800, drive assembly. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] As mentioned in the background section, in the process of recovering tin from tin-plated copper materials, regardless of whether chemical dissolution, electrolysis, or high-temperature smelting is used, only the tin and copper are separated, allowing the tin to be collected separately. Since tin easily crystallizes at room temperature, the collected tin metal needs to be remelted before it can be reused, increasing processing costs. Therefore, to address the above-mentioned technical problems, the recovery device of this application is equipped with a return pipe 400. One end of the return pipe 400 is connected to the discharge port 300, and the other end is connected to the storage tank 500. Molten tin in the heating chamber 101 flows into the storage tank 500 through the return pipe 400 for storage. A second heating element is provided on the return pipe 400, at least a portion of which is in contact with the return pipe 400 to heat the return pipe 400, keeping the tin in the return pipe 400 in a molten state. By setting up a return pipe 400, molten tin is directly guided from the heating chamber 101 to the storage tank 500 or other production stages, avoiding the process of remelting the tin metal after cooling. This not only reduces energy consumption but also saves time and labor costs, enabling continuous production and improving production efficiency. The second heating component configured on the return pipe 400 can heat the pipe in real time, ensuring that the molten tin inside remains in a molten state. This design effectively overcomes the problem of tin metal easily crystallizing at room temperature in traditional recycling methods, ensuring the fluidity of the molten tin, avoiding blockage or solidification, and allowing the tin metal to flow smoothly back to the production line, reducing maintenance costs.

[0031] Please refer to Figures 1 to 5This application provides a recycling device, comprising: a recycling body 100 rotatably disposed about a predetermined axis, the recycling body 100 having a heating chamber 101 for containing tin-plated copper material; and a first heating element 200 disposed on the recycling body 100, at least a portion of the first heating element 200 being in contact with the recycling body 100 to heat the tin-plated copper material in the heating chamber 101, heating the tin to a molten state. The molten tin is then thrown into the heating chamber 101 by centrifugal force as the recycling body 100 rotates. On the inner wall surface; a discharge port 300 is provided on the recycling body 100, through which molten tin in the heating chamber 101 is discharged; a return pipe 400 is provided, one end of which is connected to the discharge port 300 and the other end of which is connected to the storage tank 500, through which molten tin in the heating chamber 101 flows into the storage tank 500 for storage; a second heating component is provided, at least part of which is attached to the return pipe 400 to heat the return pipe 400 and keep the tin in the return pipe 400 in a molten state.

[0032] According to the recycling apparatus of this application, the recycling body 100, as the core component of the apparatus, is designed as a rotatable structure around a predetermined axis, and the internal heating chamber 101 is used to load tin-plated copper waste. This design facilitates the efficient stripping and collection of molten tin through the centrifugal force generated by rotation.

[0033] The first heating element 200 is attached to the heating element on the recycling body 100 and can directly heat the tin-plated copper material in the heating chamber 101 to above the melting point of tin. The preferred heat source type (such as resistance heating or infrared heating) and heating power must be matched with the physical properties of the tin-plated copper material to ensure that the tin layer melts quickly without damaging the copper substrate.

[0034] The return pipe 400 connects the outlet 300 and the storage tank 500, and is used to directly return molten tin to the tin bath or other storage container in the production line.

[0035] The second heating element is attached to the return pipe 400 to maintain the molten solder in the pipe and prevent it from cooling and solidifying. This can be achieved using heating elements such as electric heating wires or heat tracing tubes.

[0036] In the specific implementation process, after the tin-plated copper waste is evenly loaded into the heating chamber 101, the first heating component 200 is activated to heat the tin-plated copper material in the recycling body 100, softening the tin layer to a molten state. The recycling body 100 then begins to rotate, using centrifugal force to peel the molten tin off the copper substrate, and the molten tin is thrown onto the inner wall of the heating chamber 101. The molten tin is discharged through the outlet 300 and enters the return pipe 400; the second heating component maintains the temperature in the return pipe 400 to ensure that the molten tin remains flowing during transportation. The molten tin flows directly back to the storage tank 500 or the tin bath in the production line through the pipe, realizing the direct online recycling of tin metal.

[0037] Compared to traditional recycling methods, this device recovers tin metal through low-temperature (below the boiling point of tin and the softening temperature of copper) and physical methods, significantly reducing energy consumption. At the same time, it avoids the need for secondary smelting of tin metal, reducing subsequent processing costs.

[0038] By employing precise temperature control and physical stripping methods, damage to the copper matrix during the recycling process is minimized, preserving the integrity and reuse value of the material.

[0039] Specifically, such as Figure 3 As shown, the recycling device also includes a flow guide 700, which is disposed on the inner wall of the heating chamber 101. The flow guide 700 is connected to the discharge port 300 to guide the molten tin to the discharge port 300.

[0040] The guide section 700 improves the transmission speed and integrity of molten tin, reduces the residence time of tin inside the heating chamber 101, and reduces the loss of molten tin during the recycling process. The guide section 700 is connected to the discharge port 300 to ensure that the molten tin can flow out of the heating chamber 101 quickly and completely.

[0041] In a specific implementation, the flow guiding section 700 includes: a first flow guiding section 710, which is disposed on the side wall of the heating chamber 101 and extends along the height direction of the recovery body 100; and a second flow guiding section 720, which is disposed on the bottom wall of the heating chamber 101 and at least a portion of the second flow guiding section 720 extends along the circumferential direction of the recovery body 100, and the second flow guiding section 720 is connected to the first flow guiding section 710 and the discharge port 300 respectively. Molten tin flows to the discharge port 300 under the guiding action of the first flow guiding section 710 and the second flow guiding section 720.

[0042] The first guide section 710 is disposed on the side wall of the heating chamber 101 and extends along the height direction of the recovery body 100. This arrangement makes full use of centrifugal force and gravity. When the recovery body 100 rotates, the molten tin is thrown towards the side wall under the action of centrifugal force and then flows downward along the guide path of the first guide section 710. The second guide section 720 is disposed on the bottom wall of the heating chamber 101 and extends partially along the circumferential direction of the recovery body 100, forming an annular or partially annular structure around the bottom surface of the heating chamber 101. This design improves the uniformity and efficiency of the molten tin discharged from the outlet 300.

[0043] The first guide section 710 includes: a plurality of first guide grooves 711 disposed on the inner wall surface of the heating chamber 101 for guiding the molten tin on the inner wall surface of the heating chamber 101; the horizontal distance between the two opposite groove walls of each first guide groove 711 gradually decreases from the groove opening to the groove bottom surface.

[0044] The opening of each first guide channel 711 is relatively large to facilitate the entry of molten tin into the channel under the centrifugal force of its high-speed rotation. Specifically, the cross-section of the first guide channel 711 is V-shaped, that is, the included angle between the two opposite channel walls is 60°, and the depth of the first guide channel 711 is 8mm. This satisfies the requirements for guiding molten tin while reducing frictional resistance and preventing tin metal from solidifying or forming non-flowing deposits in the channel.

[0045] In the first embodiment provided in this application, each first guide channel 711 extends along the height direction of the recovery body 100, and multiple first guide channels 711 are arranged sequentially along the circumferential direction of the recovery body 100.

[0046] Multiple first guide channels 711 extend along the height direction of the recovery body 100, meaning these channels extend from the top to the bottom of the heating chamber 101, covering the entire side wall of the heating chamber 101. This design aims to ensure that molten tin, regardless of its height within the heating chamber 101, can find the shortest path to slide down, preventing the molten tin from remaining on the wall for too long and solidifying. The first guide channels 711 are sequentially arranged along the circumferential direction of the recovery body 100, i.e., evenly distributed on the side wall of the heating chamber 101, forming a network of guide channels. This design utilizes the combined effects of centrifugal force and gravity; when the recovery body 100 rotates, the molten tin is evenly distributed on the inner wall of the heating chamber 101. Then, as the recovery body 100 decelerates or stops rotating, the molten tin smoothly slides down along the guide path of the first guide channels 711 to the second guide section 720 on the bottom wall.

[0047] In the second embodiment provided in this application, each of the first guide channels 711 extends in a spiral trajectory along the height direction of the recovery body 100.

[0048] The first guide channel 711 extends in a spiral trajectory along the height direction of the recovery body 100. This design utilizes the principle of centrifugal force. When the recovery body 100 rotates, the molten tin is thrown towards the side wall by centrifugal force and flows from high to low along the spiral channel until it reaches the bottom of the heating chamber 101 and connects with the second guide section 720.

[0049] In this application, the second guide section 720 includes a second guide channel 721 disposed on the bottom surface of the heating chamber 101. The second guide channel 721 extends along the circumferential direction of the recovery body 100. The second guide channel 721 is connected to the first guide section 710 and the discharge port 300 respectively, so as to guide the molten tin in the first guide section 710 to the discharge port 300.

[0050] The second guide channel 721 extends along the circumferential direction of the recycling body 100, forming a closed or semi-closed annular structure. It can be a completely annular channel or multiple connected arc-shaped channels to collect the molten solder flowing down from the first guide section 710. This layout can evenly distribute the molten solder, avoid local accumulation, and ensure that the molten solder can flow evenly to the outlet 300.

[0051] The walls of the first guide groove 711 and the second guide groove 721 are polished to achieve a surface roughness Ra of 0.8 μm. This smooth surface helps the molten tin to flow smoothly and reduces the loss of tin during the guiding process.

[0052] In this application, a feed inlet is provided in the storage tank 500, which is set lower than the discharge outlet 300, so that molten tin flows into the storage tank 500 through the return pipe 400 under its own gravity.

[0053] This setup keeps the return pipe 400 at a certain angle, requiring only additional power to complete the return of the molten solder. This simplifies the operation process, reduces the difficulty of operation, and improves the automation level of the device and the efficiency of the operators.

[0054] Furthermore, an installation cavity 102 is provided in the side wall of the recovery body 100, the installation cavity 102 extends along the height direction of the recovery body 100, and at least a portion of the first heating component 200 is disposed in the installation cavity 102.

[0055] The first heating component may include, but is not limited to, an electric heating tube, a resistance heating wire, etc., which are precisely installed in the mounting cavity 102, close to the side wall of the recovery body 100 or with a certain gap between them, to ensure efficient heat transfer to the material in the heating chamber 101.

[0056] The extension of the mounting cavity 102 covers the height direction of the recovery body 100, ensuring that the heat generated by the first heating component 200 is evenly distributed throughout the heating chamber 101, avoiding incomplete melting of tin metal or local overheating of the copper substrate caused by excessive temperature gradient.

[0057] The recovery body 100 is provided with an air inlet and an air outlet. The recovery device also includes an air supply component, which is connected to the air inlet to introduce inert gas into the recovery body 100. The inert gas is discharged through the air outlet.

[0058] The introduction of inert gases (such as nitrogen) can effectively isolate the air and prevent the tin-plated copper material from oxidizing due to oxygen in the air during heating and stripping, thereby improving the purity and recovery rate of recycled tin.

[0059] The gas supply components typically include a gas storage tank, a gas compressor or nitrogen generator, a gas flow controller, and a gas heater. The gas storage tank or nitrogen generator is used to store or generate inert gas; the gas compressor is used to pressurize the gas to the required pressure; and the gas flow controller is used to precisely control the gas flow rate to ensure a stable gas environment within the heating chamber 101.

[0060] The recovery device should also include a gas circulation and purification system, which cools, filters and purifies the inert gas discharged from the outlet (such as removing tin vapor and dust that may be mixed in), and then sends it back into the gas supply components to achieve recycling, improve gas utilization efficiency and reduce operating costs.

[0061] The recycling device also includes a drive assembly 800 disposed below the recycling body 100. The drive assembly 800 includes a drive shaft rotatable about its own axis. The drive shaft is driven to connect to the recycling body 100 and drives the recycling body 100 to rotate.

[0062] The power source for the drive assembly 800 can be a three-phase asynchronous frequency converter motor or a servo motor, etc. These motors are connected to the drive shaft via a reducer to provide the required torque and speed. The selection of the motor should take into account the power requirements of the device, the speed control accuracy, and the reliability of operation.

[0063] By combining a frequency converter or PLC control system, stepless speed regulation of the drive shaft and the recycling body 100 can be achieved to adapt to the processing needs of tin-plated copper materials of different batches and thicknesses. The speed regulation range can be between 5-60 rpm, ensuring optimal tin layer recycling effect under various working conditions.

[0064] The recycling device described in this application abandons traditional chemical leaching or high-temperature volatilization methods, employing a physical method of "heat softening + centrifugal stripping." The device features a horizontal rotating drum, driven by a variable frequency motor to achieve stepless speed regulation from 0-60 rpm. Waste wires spirally wind inside the drum, and as the drum rotates, centrifugal force (with a maximum separation factor of 5.2) is generated, causing shear stress at the interface between the softened tin layer and the copper substrate, achieving non-destructive stripping. This design reduces the stripping time from several hours using traditional methods to 15-30 minutes.

[0065] A modular thick-film heater and a PID intelligent temperature control system are used to achieve three-level temperature gradient control within the device: preheating zone (150-180℃), stripping zone (260-280℃), and reflow zone (230-250℃). The heating element is a nickel-chromium alloy spiral coil with an operating voltage of 220V and a total power configuration of 800W, ensuring that the tin layer temperature is stable above the melting point (231.9℃) but far below the softening temperature of copper (approximately 400℃), completely avoiding changes in the properties of the copper substrate.

[0066] The three-stage temperature gradient design of this application has a clear functional division: ① Preheating zone (150-180℃): Gradually heats the waste wire, avoiding thermal stress deformation of the copper substrate due to instantaneous high temperature; ② Stripping zone (260-280℃): Precisely controlled between the tin melting point (231.9℃) and the copper softening point (400℃), ensuring that the tin layer softens while the copper substrate remains undamaged; ③ Reflow zone (230-250℃): Maintains the fluidity of the molten tin, preventing solidification in the guide channel and reflow pipe. Simultaneously, the heating element adopts a "drum-type alloy electric heating element," coupled with PID intelligent temperature control (temperature control accuracy ±2℃), achieving a thermal efficiency of over 85%.

[0067] The device is designed as a fully sealed structure, equipped with a nitrogen supply system with a nitrogen purity ≥99.9% and a flow rate controlled at 20-40 L / min. Nitrogen enters the drum through the inlet (Nitrogen Inlet) of the upper sealing cover, creating a slightly positive pressure environment (0.02-0.05 MPa). After being discharged through the exhaust port, it is recycled through a cooling filter. This design reduces the tin oxidation rate from 15-20% under conventional atmospheric conditions to below 0.5%.

[0068] The stripped liquid tin is collected at the bottom through V-shaped guide channels (60° angle) on the inner wall of the drum, and then flows directly back to the main tin bath of the tin plating equipment via a φ30mm stainless steel guide pipe. The guide pipe is electrically heated (200W) to ensure that the molten tin does not solidify during transportation. The entire recycling process requires no intermediate collection containers, enabling continuous production, with a tin recovery rate of >95%.

[0069] The recycling unit 100 is mounted on a vertical integrated frame, which is welded from Q235 carbon steel profiles and wrapped with a 50mm thick aluminum silicate insulation layer, with a surface temperature ≤40℃. The frame dimensions (length × width × height) are 1200mm × 800mm × 1500mm, and four adjustable anchor bolts are provided at the bottom to ensure that the equipment is installed horizontally with a levelness of ≤0.5mm / m.

[0070] The recycling unit 100 is a drum structure made of 304 stainless steel, with an inner diameter of ф400mm, a wall thickness of 8mm, and a length of 600mm. The inner wall of the drum is machined with guide grooves (50mm pitch, 5mm height). Both ends of the drum are supported at ф60mm stainless steel shafts on heavy-duty bearing seats (model UCP312). The bearings use high-temperature resistant grease and can operate continuously for 2000 hours at 300℃.

[0071] The drive assembly uses a three-phase asynchronous variable frequency motor (0.75kW power, rated speed 1400rpm), connected to the drum spindle via a worm gear reducer with a reduction ratio of 1:50. The reducer outputs a torque ≥300N·m, ensuring smooth start-up of the drum even under full load (50kg of waste wire). The frequency converter supports RS485 communication and can be integrated with a PLC control system to achieve closed-loop speed control with a speed accuracy of ±1 rpm.

[0072] A small amount of nitrogen gas (5 L / min) is introduced into the sealed heating chamber to form a positive pressure barrier and prevent external air from seeping in.

[0073] Heating component configuration: Three independently controlled U-shaped electric heating tubes are arranged around the outer wall of the drum, each with a power of 267W, for a total power of 802W. The heating tubes are made of Incoloy 800 alloy with a surface load ≤3W / cm², ensuring a long service life. The distance between the heating tubes and the outer wall of the drum is maintained at 20mm, and the thermal efficiency reaches over 85% through a combination of radiation and convection heat transfer.

[0074] Temperature sensor network: 5 type K thermocouples (accuracy ±1.5℃)

[0075] T1: Temperature monitoring in the preheating zone;

[0076] T2 / T3: Temperature monitoring at two points above and below the stripping zone;

[0077] T4: Reflux channel temperature monitoring;

[0078] T5: Nitrogen outlet temperature monitoring;

[0079] All thermocouple signals are connected to an 8-channel PID temperature control module (model OMRON E5CC), supporting MODBUS-RTU communication. The temperature control module uses an adaptive PID algorithm, with a temperature control accuracy of ±2℃.

[0080] Safety protection: An over-temperature protection switch (operating temperature 300℃, normally closed contact) is installed in series in the heating circuit. When the temperature at any point exceeds 290℃, the system immediately cuts off the heating power supply and triggers an audible and visual alarm. A residual current circuit breaker (rated current 16A, operating current 30mA) is also configured to ensure personal safety.

[0081] Nitrogen supply and circulation system:

[0082] Nitrogen generator unit:

[0083] Equipped with a pressure swing adsorption (PSA) nitrogen generator, it produces 5 m³ / h of nitrogen with a purity of 99.9% and an outlet pressure of 0.6 MPa. The nitrogen generator has a built-in refrigerated dryer and a three-stage filtration system (1 μm precision) to ensure that the nitrogen is dry and clean.

[0084] Flow control:

[0085] The nitrogen pipeline is equipped with a glass rotor flow meter (range 10-100 L / min, accuracy 4%) and a precision pressure regulating valve (0-0.1MPa adjustable). Before entering the drum, the nitrogen is preheated to 150°C through a preheating coil (coiled around the outer wall of the heating cylinder) to prevent cold nitrogen from causing local solidification of the molten solder.

[0086] Exhaust and recirculation:

[0087] The exhaust port is located on the upper end cover of the drum. The discharged nitrogen-tin vapor mixture enters a water-cooled condenser (heat exchange area 2m²) to condense and recover the tin vapor. After condensation, the nitrogen gas passes through a particulate filter (filtration accuracy 0.1μm) to remove droplets, and is then pressurized by a circulating fan (flow rate 50m³ / h) and returned to the system. The nitrogen utilization rate is >90%.

[0088] Tin recycling channel system:

[0089] Flow channel design:

[0090] A V-shaped guide groove (60° included angle, 8mm depth) is milled longitudinally at the bottom of the inner wall of the drum, and the bottom of the groove is polished to Ra 0.8μm. Liquid tin collects in the guide groove under the action of centrifugal force and gravity and flows towards the end of the drum.

[0091] Return pipe:

[0092] The end of the guide channel is connected to a ф30×2mm 316L stainless steel seamless pipe as a return pipe, with a pipe length ≤800mm and an inclination angle ≥15° to ensure smooth self-flow of molten solder. A self-regulating electric heating tape (maintaining a temperature of 240-250℃) is wrapped around the outer wall of the pipe, with a power density of 30W / m. The pipe is covered with a 20mm aluminum silicate fiber insulation layer, with an outer surface temperature ≤50℃.

[0093] Solder bath connection:

[0094] The return pipe outlet is designed as a quick connector (DN25 clamp type) to connect with the return port of the main tin bath in the tin plating equipment. The connector is made of 316 stainless steel and has a built-in high-temperature resistant silicone gasket (temperature resistance -60~280℃) to ensure no leakage.

[0095] Automatic control system:

[0096] The system uses a Siemens S7-200 SMART PLC as its control core and a 10-inch touchscreen (model KTP700) as its human-machine interface. The system implements the following functions:

[0097] One-button start: Automatically completes the entire process of nitrogen purging, preheating, heating, rotation, stripping, and reflux.

[0098] Parameter settings: Target temperature (200-280℃), rotation speed (5-60 rpm), nitrogen flow rate (20-40 L / min), and processing time (0-99 minutes) can be set.

[0099] Data logging: Records temperature, speed, and flow rate data in real time and stores them on the built-in SD card, supporting USB export.

[0100] Fault diagnosis: Real-time alarms for faults such as broken heating element wire, thermocouple failure, motor overload, and low nitrogen pressure.

[0101] Process parameters and performance indicators:

[0102] Process parameters:

[0103] Operating temperature: 260-280℃ (stripping zone), temperature control accuracy ±2℃;

[0104] Rotation speed: 30-45 rpm (preferably 40 rpm), frequency adjustable;

[0105] Nitrogen flow rate: 25-35 L / min (preferably 30 L / min), purity ≥99.9%;

[0106] Processing time: 20-30 minutes per batch;

[0107] Loading capacity: 30-50 kg of waste wire per batch;

[0108] Nitrogen pressure: 0.02-0.05 MPa (slight positive pressure);

[0109] Performance metrics:

[0110] Tin recovery rate: ≥95.0% (actual operating rate can reach 95.6%);

[0111] Copper loss rate: ≤0.1% (the copper substrate remains solid, with almost no loss).

[0112] Tin purity: ≥99.95% (tin oxide content <0.5% due to nitrogen protection);

[0113] Energy consumption: It consumes approximately 85 kWh of electricity to process 1 ton of waste wire (heating and driving only), which is more than 60% more energy-efficient than the traditional smelting method;

[0114] Capacity: 120-150 kg / h per unit, with an annual processing capacity of 800-1000 tons;

[0115] Floor space: 1.2m × 0.8m, 70% smaller than rotary kiln equipment;

[0116] Advantages compared to existing technologies:

[0117]

[0118] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0119] 1. Experimental materials and equipment:

[0120] Experimental materials:

[0121] Waste wire from tin-plated copper strip (thickness 0.15mm, width 5mm, surface tin layer purity ≥99.9%).

[0122] Loading capacity: 40kg (actual processing capacity);

[0123] Processing objective: To recover the tin layer and return it to the tin bath of the tin plating equipment;

[0124] Equipment configuration:

[0125] Rotary drum: inner diameter 400mm, wall thickness 8mm, guide groove with 60° included angle;

[0126] Drive system: Variable frequency motor (0.75kW, 1400rpm) + reducer (1:50);

[0127] Heating system: 800W Incoloy 800 alloy heating element, PID temperature control (temperature control accuracy ±2℃);

[0128] Nitrogen system: PSA nitrogen generator (5m³ / h, 99.9% purity), flow meter (25-35 L / min);

[0129] Reflux system: 316L stainless steel pipe ( 30mm), with a heat tracing cable (200W);

[0130] 2. Experimental parameter settings:

[0131] Operating temperature: 275℃ (stripping zone);

[0132] Rotation speed: 40 rpm (variable frequency adjustment);

[0133] Nitrogen flow rate: 30 L / min;

[0134] Processing time: 25 minutes;

[0135] Environment: Sealed nitrogen protection (slight positive pressure 0.03 MPa);

[0136] 3. Experimental Procedure:

[0137] Pretreatment: Load the waste edge wires evenly into the drum and start nitrogen purging (30 L / min) to remove air.

[0138] Heating: Start the heating system to raise the drum temperature to 275℃ and keep it stable.

[0139] Rotation and peeling: Start the variable frequency motor and rotate the roller at 40 rpm for 25 minutes.

[0140] Recovery: Liquid tin flows through a guide channel into a return pipe and is directly returned to the tin bath of the tin plating equipment.

[0141] 4. Experimental Results and Analysis:

[0142] Tin recovery rate:

[0143] Measured amount of recovered molten tin: 2.8 kg (theoretical value);

[0144] Actual recovery rate: 95.3% (theoretical value: 95.6%);

[0145] Copper loss rate:

[0146] The copper substrate is undamaged, with a smooth surface and no signs of oxidation.

[0147] Energy consumption and time:

[0148] Processing time is 25 minutes, energy consumption is 85 kWh (including heating and drive).

[0149] Comparative analysis:

[0150] Compared with the traditional chemical method (60% recovery rate), the efficiency of this device is improved by more than 50%.

[0151] Compared to the high-temperature smelting method (80% recovery rate), energy consumption is reduced by 60%.

[0152] 5. Conclusion:

[0153] This device achieves efficient recovery of tin layers through low-temperature (275℃) rotary stripping and nitrogen protection, with a recovery rate of >95% and no secondary pollution.

[0154] The device has a compact structure, is easy to operate, is suitable for continuous production, and has significant economic benefits and environmental advantages.

[0155] This is the first time that the principle of "low-temperature softening-centrifugal stripping" has been applied to the recycling of tin-plated layers. The working temperature is set below 280℃, which is far below the boiling point of tin (2260℃) and the softening temperature of copper. It belongs to a non-metallurgical physical separation method and breaks through the technical path of traditional chemical or high-temperature metallurgy.

[0156] The system integrates four major functions—rotary stripping, gradient heating, nitrogen protection, and online reflux—into a single closed system, forming a closed loop of "processing-recycling-reuse." In particular, the combined design of the V-shaped flow channel and the heated pipe solves the problem of liquid tin flow and solidification in low-temperature environments (not seen in any existing device to date).

[0157] While achieving a tin recovery rate of >95%, the copper loss rate is controlled to within 0.1%, and the recovered tin is directly returned to the production line without the need for secondary smelting. Compared with microwave smelting (which requires a dedicated furnace and is costly) and chemical methods (which generate pollution), this device has the advantages of high efficiency, environmental protection, and low cost.

[0158] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0159] The recycling device of this application includes a reflux pipe 400, one end of which is connected to the discharge port 300, and the other end to the storage tank 500. Molten tin in the heating chamber 101 flows into the storage tank 500 through the reflux pipe 400 for storage. A second heating element is installed on the reflux pipe 400, at least a portion of which is in contact with the reflux pipe 400 to heat it, keeping the tin in the reflux pipe 400 in a molten state. By using the reflux pipe 400, molten tin is directly guided from the heating chamber 101 to the storage tank 500 or other production stages, avoiding the process of remelting the tin metal after cooling. This not only reduces energy consumption but also saves time and labor costs, enabling continuous production and improving production efficiency. The second heating element on the reflux pipe 400 can heat the pipe in real time, ensuring that the molten tin in the pipe remains in a molten state. This design effectively overcomes the problem of tin metal easily crystallizing at room temperature in traditional recycling methods, ensuring the fluidity of molten tin, avoiding blockage or solidification, and allowing tin metal to flow smoothly back to the production line, reducing maintenance costs.

[0160] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0161] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0162] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0163] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A recycling device, characterized in that, The recycling device comprises: a recycling body (100) rotatably arranged around a predetermined axis, the recycling body (100) having a heating chamber (101) therein, the heating chamber (101) being used for accommodating a tinned copper material; a first heating component (200) arranged on the recycling body (100), at least a part of the first heating component (200) being attached to the recycling body (100) to heat the tinned copper material in the heating chamber (101) to heat tin into a molten state, and the molten tin being thrown onto an inner wall surface of the heating chamber (101) under the action of centrifugal force by rotating the recycling body (100); a discharge port (300) arranged on the recycling body (100), the molten tin in the heating chamber (101) being discharged through the discharge port (300); a return pipe (400) having one end in communication with the discharge port (300) and the other end in communication with a storage tank (500), the molten tin in the heating chamber (101) flowing into the storage tank (500) through the return pipe (400) for storage; a second heating component, at least a part of the second heating component being attached to the return pipe (400) to heat the return pipe (400) so that the tin in the return pipe (400) remains in a molten state.

2. The recycling apparatus of claim 1, wherein The recycling device further comprises: a flow guide portion (700) arranged on the inner wall surface of the heating chamber (101), the flow guide portion (700) being in communication with the discharge port (300) to guide the molten tin to the discharge port (300).

3. The recycling apparatus of claim 2, wherein, The flow guide portion (700) comprises: a first flow guide portion (710) arranged on a side wall surface of the heating chamber (101), the first flow guide portion (710) extending along a height direction of the recycling body (100); a second flow guide portion (720) arranged on a bottom wall surface of the heating chamber (101), at least a part of the second flow guide portion (720) extending along a circumferential direction of the recycling body (100), and the second flow guide portion (720) being in communication with the first flow guide portion (710) and the discharge port (300) respectively, the molten tin flowing to the discharge port (300) under the guidance of the first flow guide portion (710) and the second flow guide portion (720).

4. The recycling apparatus of claim 3, wherein The first flow guide portion (710) comprises: a plurality of first flow guide grooves (711) arranged on the inner wall surface of the heating chamber (101) to guide the molten tin on the inner wall surface of the heating chamber (101); from the direction of the groove opening to the groove bottom surface of the first flow guide groove (711), the horizontal distance between the two groove wall surfaces opposite to each other gradually decreases.

5. The recycling device according to claim 4, wherein Each first flow guide groove (711) extends along the height direction of the recycling body (100), and a plurality of first flow guide grooves (711) are sequentially arranged along the circumferential direction of the recycling body (100); or Each first flow guide groove (711) extends along the height direction of the recycling body (100) in a spiral trajectory.

6. The recycling apparatus of claim 3, wherein The second flow guide part (720) comprises: A second flow guide groove (721) is arranged on the bottom surface of the heating chamber (101), the second flow guide groove (721) extends along the circumferential direction of the recycling body (100), and the second flow guide groove (721) is connected with the first flow guide part (710) and the discharge port (300) respectively to guide the molten tin in the first flow guide part (710) to the discharge port (300).

7. The recycling apparatus of claim 1, wherein The storage tank (500) is provided with an inlet, which is arranged lower than the discharge port (300), so that the molten tin flows into the storage tank (500) through the reflux pipeline (400) under the action of its own gravity.

8. The recycling apparatus of claim 1, wherein The side wall of the recycling body (100) is provided with a mounting cavity (102), the mounting cavity (102) extends along the height direction of the recycling body (100), and at least part of the first heating component (200) is arranged in the mounting cavity (102).

9. The recycling apparatus of claim 1, wherein, The recycling body (100) is provided with an air inlet and an air outlet, and the recycling device further comprises: A gas supply component is in communication with the air inlet for introducing inert gas into the recycling body (100), and the inert gas is discharged through the air outlet.

10. The recycling apparatus of claim 1, wherein, The recycling device further comprises: A driving assembly (800) is arranged below the recycling body (100), the driving assembly (800) comprises a driving shaft which is rotatable about its own axis, the driving shaft is drivingly connected with the recycling body (100), and the recycling body (100) is driven to rotate by the driving shaft.

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