System and method for separating tungsten base, nickel and diamond in waste tungsten wire diamond wire

Abstract

The invention discloses a system and a method for separating tungsten base, nickel and diamond in a waste tungsten wire diamond wire. The system comprises a liquid storage tank, a cathode corrugated sheet, a filling tank, a power supply, a circulating liquid return pipe and a lamination filter pump, the filling tank is arranged in the liquid storage tank and comprises a bottom frame, a titanium anode upper plate, a titanium anode lower plate, a titanium conductive binding post and a circulating liquid inlet pipe, the power supply is connected with the cathode corrugated sheet and the titanium conductive binding post, and the circulating liquid return pipe is connected with the lamination filter pump. The inlet is connected with the bottom of the reservoir, and the outlet is connected with the top of the reservoir. The method comprises the steps that a filling groove is filled with the waste tungsten wire diamond wire, and electroplating cleaning liquid is injected; starting a power supply and a circulating liquid return pipe to carry out electrolytic deplating, so that nickel and copper metals are dissolved and deposited on a cathode corrugated sheet; meanwhile, diamond particles are collected through a lamination filter pump; and finally, recovering each material. The method realizes efficient separation and recovery of tungsten base, nickel and diamond in the waste tungsten wire diamond wire, is environment-friendly and high in efficiency, and is suitable for industrial application.

Description

Technical Field

[0001] This invention belongs to the field of solid waste recycling and treatment technology, specifically relating to a system and method for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire. Background Technology

[0002] With the rapid development of the photovoltaic industry, the trend towards thinner silicon wafers has driven tungsten wire to replace carbon steel wire as the substrate for electroplated diamond wire, widely used in silicon wafer cutting. Waste tungsten-diamond wire mainly consists of the tungsten wire base, a nickel plating layer, and diamond. Existing recycling methods are inefficient, making it difficult to separate the components effectively, thus limiting its recycling value. Currently, manufacturers recycle and resell the cut waste tungsten-diamond wire to reduce costs, but how to increase its value remains an industry challenge. Therefore, an efficient and economical method is needed to separate the tungsten wire base, diamond, and nickel metal to maximize its recycling value. Summary of the Invention

[0003] The purpose of this invention is to solve the above-mentioned problems and provide a system and method for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire. This system and method achieve efficient separation and recovery of each component through specific electrolytic stripping, cathode deposition, and deposition filtration separation steps.

[0004] The specific technical solution adopted in this invention is as follows:

[0005] In a first aspect, the present invention provides a system for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire, comprising a storage tank, a cathode corrugated sheet, a filling tank, a power supply, a circulating return pipe, and a stacked filter pump. The storage tank is used to store electroplating cleaning solution. The filling tank, placed inside the storage tank, is used to store the waste tungsten wire diamond wire to be treated. It includes a bottom frame, a titanium upper anode plate, a titanium lower anode plate, titanium conductive terminals, and a circulating inlet pipe. The titanium lower anode plate is mounted on the bottom frame, the lower end of the titanium conductive terminals is connected to the titanium lower anode plate, the titanium upper anode plate is connected to the upper end of the titanium conductive terminals, one end of the circulating inlet pipe is placed in the storage tank, and the other end is placed between the titanium upper anode plate and the titanium lower anode plate. The power supply is connected to the cathode corrugated sheet and the titanium conductive terminals respectively. The stacked filter pump is connected to the circulating return pipe, and the inlet of the circulating return pipe is connected to the bottom of the storage tank, and the outlet of the circulating return pipe is connected to the top of the storage tank.

[0006] The bottom frame features an open, five-sided perforated structure, ensuring that the waste tungsten wire and diamond wire filled in the filling tank can fully contact the electroplating cleaning solution while preventing deformation of the titanium anode lower plate. The titanium anode upper and lower plates are perforated, ensuring repeated contact between the filled waste tungsten wire and diamond wire and the plating solution. The titanium anode lower plate is fixedly connected to the lower end of the titanium conductive terminal block, and fixed to the titanium anode upper plate at the upper end, forming a detachable structure for easy filling of waste tungsten wire and diamond wire and recovery of the tungsten wire baseline. A circulating inlet pipe is distributed in the middle of the titanium conductive terminal blocks, spraying the plating solution onto the filled waste tungsten wire and diamond wire via a circulating pump and the circulating inlet pipe, thereby achieving rapid ion exchange.

[0007] When the power is turned on, the metal in the waste tungsten wire diamond wire filled in the filling tank loses electrons, and the reaction is as follows:

[0008] Ni-2e-=Ni 2+

[0009] Cu - 2e- = Cu 2+

[0010] Zn-2e-=Zn 2+

[0011] Meanwhile, due to the side reaction 2H that occurs with discarded tungsten wire and diamond wire... + -2e- = H2, which causes the pH value around the waste tungsten wire diamond wire to rise synchronously. Therefore, it is necessary to replenish the electroplating cleaning solution in the storage tank at the same time to adjust the pH value and stabilize the electrolytic reaction.

[0012] Electrons are gained on the surface of the cathode corrugated sheet, and copper and nickel ions from the surface of the discarded tungsten wire and diamond wire are deposited on the cathode corrugated sheet, as shown in the following reaction formula:

[0013] Ni 2+ +2e-=Ni

[0014] Cu 2+ +2e-=Cu

[0015] Then, metallic nickel and metallic copper are deposited on the cathode corrugated sheet, while zinc ions do not deposit due to potential and concentration, thus achieving the separation of metallic nickel.

[0016] Preferably, the filling groove is a hollow cavity with a cuboid, cube, or sphere structure to facilitate the flow and contact of the electroplating cleaning solution.

[0017] Preferably, the surfaces of the upper and lower titanium anode plates are coated with one or more materials selected from iridium, tantalum, and silver to improve the conductivity and corrosion resistance of the titanium anode.

[0018] Preferably, the electroplating cleaning solution is a nickel aminosulfonate plating solution, which is suitable for electrolytic stripping processes.

[0019] Preferably, it also includes a replenishment tank, which is connected to the storage tank and is used to replenish the storage tank with electroplating cleaning solution to adjust the pH value in the storage tank and maintain electrolytic stability. In order to reduce the labor intensity of operation, a titration valve can be installed at the outlet of the replenishment tank. The titration speed of the titration valve can be set according to the electrolysis speed, thereby realizing automatic replenishment of electroplating cleaning solution.

[0020] Preferably, the circulating inlet pipe is connected to a circulating pump, and the end of the circulating inlet pipe located between the upper and lower titanium anode plates has several spray holes to uniformly spray the electroplating cleaning solution and enhance the electrolysis effect.

[0021] Secondly, based on the above-mentioned system, the present invention provides a method for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire, comprising the following steps:

[0022] S100. Fill the filling tank with waste tungsten wire and diamond wire, and inject electroplating cleaning solution into the storage tank.

[0023] S200, turn on the power supply and the circulating return pipe to perform electrolytic stripping, so that the nickel and copper metals in the waste tungsten wire diamond wire can be dissolved and deposited on the cathode corrugated sheet;

[0024] S300, simultaneously collects diamond particles in the electroplating cleaning solution based on the disc filter pump on the circulating return pipe;

[0025] S400 After electrolysis is completed, the tungsten wire baseline, nickel-copper metal and diamond particles on the filling tank, cathode corrugated sheet and stacked filter pump are recovered respectively.

[0026] Preferably, the electrolytic stripping current is 30-40A, the electrolysis temperature is 45-55℃, and the electrolysis time is 60-70 hours to ensure efficient separation.

[0027] Preferably, the electroplating cleaning solution is a nickel sulfamate plating solution, which contains 200-250 g / L of nickel sulfamate, 30-40 g / L of boric acid, and has a pH value of 3.5-4.0 to optimize the electrolysis environment.

[0028] Compared with the prior art, the present invention has the following beneficial technical effects:

[0029] This invention sprays electroplating cleaning solution onto waste tungsten wire diamond wire stored in a filling tank via a circulating inlet pipe. This allows for rapid ion exchange of nickel, copper, and zinc ions in the waste tungsten wire diamond wire within the filling tank, enabling the nickel and copper ions to deposit on the imprinted corrugated sheet. Simultaneously, diamond particles in the electroplating cleaning solution are collected using a circulating return pipe and a stacked filter pump. Ultimately, this invention achieves effective separation of tungsten-based materials, metallic nickel, and diamond particles from the waste tungsten wire diamond wire. It is environmentally friendly and highly efficient, making it suitable for industrial applications. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the system for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire in this invention;

[0032] Figure 2 This is a schematic diagram of the filling groove in this invention;

[0033] Figure 3 This is a flowchart of the method for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire in this invention.

[0034] In the diagram: 1. Storage tank, 2. Corrugated cathode sheet, 3. Filling tank, 31. Base frame, 32. Upper titanium anode plate, 33. Lower titanium anode plate, 34. Titanium conductive terminal, 35. Circulation inlet pipe, 4. Power supply, 5. Circulation return pipe, 6. Disc filter pump, 7. Makeup tank, 8. Titration valve. Detailed Implementation

[0035] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way.

[0036] like Figure 1 , Figure 2 As shown, Figure 1 A schematic diagram of a system for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire is shown. Figure 2 A schematic diagram of the filling groove is shown. Figure 3 A flowchart illustrating a method for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire is shown.

[0037] Example 1: Standardized Large-Scale Recycling Example

[0038] This embodiment demonstrates the entire process of efficient recycling of waste tungsten wire and diamond wire using the system of the present invention on a standard scale, as detailed below:

[0039] System preparation:

[0040] The bottom frame 31 of the filling tank 3 is made of 15mm thick PPR board, with dimensions of 300mm×600mm×400mm. To ensure the flow of electrolyte, a through hole with a diameter of 20mm is opened at every 60mm interval on the bottom surface and four sides of the bottom frame 31.

[0041] The titanium anode lower plate 33 (with dimensions of 280mm×580mm×2mm) is fixed on the bottom frame 31, and 10 titanium conductive terminals 34 with a cross section of 10mm×10mm and a height of 380mm are welded on it at 100mm intervals.

[0042] The titanium anode upper plate 32 (with the same dimensions as the lower plate) is connected to the top of the titanium conductive terminal 34 via a screw and nut, forming an openable cavity. A 50mm diameter circular hole is cut out on one side of the upper plate for housing the circulating liquid inlet pipe 35.

[0043] The main pipe of the circulating liquid inlet pipe 35 has a diameter of 30mm. It is placed between the upper titanium anode plate 32 and the lower titanium anode plate 33 and is located in the middle of the titanium conductive terminal 34. The circulating liquid inlet pipe 35 has two branch pipes with a spacing of 100mm between them. On each branch pipe, a spray hole with a diameter of 3mm is opened every 30mm to ensure that the electroplating cleaning solution can be sprayed evenly.

[0044] Process:

[0045] (1) Prepare electrolyte: Inject 300 liters of electroplating cleaning solution into storage tank 1. The electroplating cleaning solution is nickel aminosulfonate plating solution, and its composition is: nickel aminosulfonate 220g / L, boric acid 35g / L. Use aminosulfonate to adjust the pH value of the solution to 3.8.

[0046] (2) Filling materials: Disassemble the titanium anode upper plate 32 and the circulating liquid inlet pipe 35. First, fill the waste tungsten wire diamond wire evenly around the titanium conductive terminal 34 to a height of 160mm. Then, reset the circulating liquid inlet pipe 35 and continue filling to a height of 380mm. The total filling amount is about 20 kg. After installing the titanium anode upper plate 32, use a crane to immerse the entire filling tank 3 into the storage tank 1.

[0047] (3) Electrolytic separation: Connect the power supply 4, the cathode corrugated sheet 2 and the titanium conductive terminal 34. The cathode corrugated sheet 2 is pre-weighed. Turn on the stacked filter pump 6 connected to the circulation return pipe 5 to circulate the electrolyte. Control the electrolysis temperature at 50°C and turn on the DC power supply 4. Set the current to 35A and electrolysis continues for 65 hours. During this period, the nickel sulfamate plating solution is continuously replenished through the replenishment tank 7 and the titration valve 8 to stabilize the pH value of the electroplating cleaning solution in the storage tank 1.

[0048] (4) Recovered products: After electrolysis, the filling tank 3 is removed to obtain the tungsten wire substrate with the nickel layer completely stripped off. After cleaning and drying, it is weighed to obtain about 16.48 kg of pure tungsten wire and 3.04 kg of cathode corrugated sheet 2. The main components are deposited nickel and copper metal. Diamond particles suspended in the electrolyte are collected by the stacked filter pump 6. After cleaning and drying, about 0.12 kg of diamond is obtained.

[0049] Example 2: An Example of Optimized Filling and Fluid Distribution

[0050] This embodiment focuses on demonstrating an implementation scheme that improves separation efficiency and product purity by optimizing the packing structure and fluid distribution, as detailed below:

[0051] System optimization:

[0052] The structure of the filling groove 3 in this embodiment is optimized based on the structure of embodiment 1. The surfaces of the upper titanium anode plate 32 and the lower titanium anode plate 33 are coated with an iridium coating to enhance their conductivity and electrochemical stability and reduce losses.

[0053] The number of branches in the circulating liquid inlet pipe 35 has been increased to 3, the branch spacing has been adjusted to 80mm, and the nozzle diameter has been reduced to 2mm but the number has been increased. This is to form a finer and more uniform liquid flow, strengthen the flushing of waste tungsten wire and diamond wire, and prevent diamond particles from depositing in the gaps.

[0054] Process:

[0055] (1) Layered filling: A special layered filling method is adopted. First, a layer of waste tungsten wire diamond wire is filled, and then a small amount of inert ceramic beads (which do not participate in the reaction) are evenly sprinkled in as tracers. Then the next layer is filled. This method helps to form a smoother fluid channel during electrolysis and promotes the elution and transport of diamond particles.

[0056] (2) Enhanced circulation: In addition to the disc filter pump 6, an auxiliary stirrer is added to the circulation return pipe 5 to gently stir the electrolyte at the bottom of the storage tank 1 to prevent diamond precipitation.

[0057] (3) Precise temperature control: The electrolysis process adopts programmed temperature rise: the temperature is controlled at 45°C for the first 10 hours to promote the uniform activation of the nickel layer; then it is maintained at 52°C for the next 50 hours to accelerate the stripping; and finally it is reduced to 48°C for the last 5 hours to make the metal layer deposited at the cathode more dense.

[0058] After this optimized process, the final tungsten filament substrate has a smoother surface, the diamond recovery rate in the stacked filter pump 6 is increased by about 5%, and the nickel-copper metal structure deposited on the cathode is more compact and easier to peel off.

[0059] Example 3: Targeted Recycling of Waste Specific Components

[0060] This embodiment demonstrates how the present invention achieves targeted and efficient recycling of a specific batch of waste tungsten-diamond wire with known composition by adjusting process parameters. The waste tungsten-diamond wire to be processed has a thin nickel plating and a high diamond density. The specific process is as follows:

[0061] Process adjustments:

[0062] (1) Electrolyte adjustment: In order to improve current efficiency and for thinner nickel layers, a nickel sulfamate plating solution with a slightly lower concentration is used: nickel sulfamate 200g / L, boric acid 40g / L, pH value strictly controlled at 4.0.

[0063] (2) Electrolysis parameters: Electrolysis is carried out using the “step current” method. In the initial stage, the current is 30A for 20 hours to ensure the quality of the initial deposited layer. Then the current is increased to 38A for 30 hours to accelerate the stripping process. In the final stage, the current is reduced to 32A for 15 hours, with a total duration of 65 hours. This adjustment strategy can reduce edge effects and improve the purity of the cathode deposited metal while ensuring the stripping effect.

[0064] (3) Diamond collection: Given the high diamond content, the system is paused after 30 hours and 55 hours of electrolysis, respectively, to perform preliminary cleaning and collection of the diamonds collected by the disc filter pump 6, to avoid filter blockage, and to achieve graded collection of diamonds (diamonds that fall off at different time periods may have different particle sizes and wear levels).

[0065] After treatment with this directional process, the recovery rate of the tungsten filament substrate reached the expected level, the cathode deposition weight gain was 2.8 kg, which is consistent with the characteristics of the thin nickel layer of the material, and the total diamond recovery reached 0.15 kg, proving the adaptability of this process to materials with high diamond content.

[0066] The above provides a detailed description of the system and method for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire, as provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A system for separating tungsten-based, nickel, and diamond components from waste tungsten wire diamond wire, characterized in that, include: Storage tank, used to store electroplating cleaning solution; Cathode corrugated sheet; A filling tank, placed inside a storage tank, is used to store waste tungsten wire diamond wire to be treated. It includes a bottom frame, a titanium anode upper plate, a titanium anode lower plate, titanium conductive terminals, and a circulation inlet pipe. The titanium anode lower plate is installed on the bottom frame, the lower end of the titanium conductive terminals is connected to the titanium anode lower plate, the titanium anode upper plate is connected to the upper end of the titanium conductive terminals, one end of the circulation inlet pipe is placed in the storage tank, and the other end of the circulation inlet pipe is placed between the titanium anode upper plate and the titanium anode lower plate. The power supply is connected to the cathode corrugated sheet and the titanium conductive terminal, respectively. A circulating return pipe is connected to a disc filter pump, with the inlet of the circulating return pipe connected to the bottom of the storage tank and the outlet of the circulating return pipe connected to the top of the storage tank.

2. The system for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire according to claim 1, characterized in that, The filling groove is a hollow cavity with a cuboid, cube, or sphere structure.

3. The system for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire according to claim 1, characterized in that, The surfaces of the upper and lower titanium anode plates are coated with one or more materials selected from iridium, tantalum, and silver.

4. The system for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire according to claim 1, characterized in that, The electroplating cleaning solution is a nickel aminosulfonate plating solution.

5. The system for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire according to claim 1, characterized in that, It also includes a replenishment tank, which is connected to a storage tank to replenish the storage tank with electroplating cleaning solution in order to adjust the pH value in the storage tank.

6. The system for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire according to claim 1, characterized in that, The circulating inlet pipe is connected to a circulating pump, and several spray holes are opened at one end of the circulating inlet pipe located between the upper and lower plates of the titanium anode.

7. A method for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire, characterized in that, The system for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire according to any one of claims 1-6, the method comprising the following steps: S100. Fill the filling tank with waste tungsten wire and diamond wire, and inject electroplating cleaning solution into the storage tank. S200, turn on the power supply and the circulating return pipe to perform electrolytic stripping, so that the nickel and copper metals in the waste tungsten wire diamond wire can be dissolved and deposited on the cathode corrugated sheet; S300, simultaneously collects diamond particles in the electroplating cleaning solution based on the disc filter pump on the circulating return pipe; S400 After electrolysis is completed, the tungsten wire baseline, nickel-copper metal and diamond particles on the filling tank, cathode corrugated sheet and stacked filter pump are recovered respectively.

8. The method for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire according to claim 7, characterized in that, The electrolytic stripping current is 30-40A, the electrolysis temperature is 45-55℃, and the electrolysis time is 60-70 hours.

9. The method for separating tungsten-based materials, nickel, and diamond from waste tungsten wire diamond wire according to claim 7, characterized in that, The electroplating cleaning solution is a nickel sulfamate plating solution, which contains 200-250 g / L of nickel sulfamate and 30-40 g / L of boric acid. The pH value of the nickel sulfamate plating solution is 3.5-4.0.

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