A spray type copper dissolving tank

Abstract

The utility model discloses a kind of spray type copper dissolving tank, including tank body, the top of the tank body is provided with spray pipe, the inside of the tank body is installed with support plate, the support plate has multiple heightening steel frames, the heightening steel frame is the frame structure made of corrosion-resistant material, the tank body inside is located below support plate and is installed with multiple hole plate, the lower end side of the tank body is installed with liquid outlet, by setting multiple heightening steel frames can raise raw material accumulation position, make air flow increase, increase the flowability of sulfuric acid solution, can accelerate the dissolution of copper;By setting multiple hole plate can let upside portion dissolved raw material drop on multiple hole plate and continue secondary dissolution, improve dissolution efficiency.

Description

Technical Field

[0001] This utility model relates to the field of metal electrolytic foil production technology, specifically a spray-type copper melting tank. Background Technology

[0002] Currently, copper dissolving mainly employs two methods: immersion dissolving and spray dissolving. Immersion dissolving involves cutting raw copper plates into small pieces, copper wire, or waste foil and placing them into a dissolving tank. The sulfuric acid solution is heated through a heat exchanger, and compressed air is blown into the solution to provide oxygen, allowing the solution to react with the raw materials. Spray dissolving involves spraying sulfuric acid onto the raw materials through nozzles, causing the copper to react with the sulfuric acid to form copper sulfate. The advantage of this method is that the solution can more evenly contact the surface of the raw materials, allowing for better control of the reaction rate and efficiency.

[0003] Copper foil companies typically feed various raw materials, such as copper plates, copper wires, and waste foil, into the copper melting tank. This process often leads to material buildup, and during production, copper powder and shavings are generated. This results in poor air circulation within the melting tank and a limited surface area of ​​contact between the raw materials and the sulfuric acid solution, significantly restricting the copper melting rate. Furthermore, copper powder and shavings can flow into the filtration system along with some of the electrolyte, increasing the burden on the filtration system. Therefore, improving the copper melting rate is of great significance to copper foil production. Utility Model Content

[0004] This utility model provides a spray-type copper melting tank that employs a two-stage copper melting process. This solves the problems of poor air circulation inside the copper melting tank caused by raw material accumulation, copper powder and copper shavings generated during production, limited surface area of ​​raw materials in contact with sulfuric acid liquid, and low copper melting rate.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a spray-type copper dissolving tank, comprising a tank body, a spray pipe installed at the top of the tank body, a support plate installed on the inner side of the tank body, and multiple raising steel frames on the support plate. The raising steel frames are frame structures made of corrosion-resistant materials. A perforated plate is installed inside the tank body below the support plate. A liquid outlet is installed on one side of the lower end of the tank body. By setting multiple raising steel frames, the raw material accumulation position can be raised, increasing air circulation and the fluidity of the sulfuric acid solution, which can accelerate the dissolution of copper. By setting the perforated plate, the raw material partially dissolved on the upper side can fall onto the perforated plate for secondary dissolution, thereby improving the dissolution efficiency.

[0006] Preferably, the height-increasing steel frame is a cubic or cuboid frame structure made of stainless steel tubing, which facilitates placement, transportation and stacking, and helps improve air circulation.

[0007] Preferably, at least one horizontal bar is provided at the top hollowed-out position of the heightening steel frame to support the raw materials on the upper side of the heightening steel frame and prevent the raw materials from entering the interior of the heightening steel frame.

[0008] Preferably, the porous plate is inclined, which can concentrate the copper powder and copper shavings falling on the porous plate to one side, and also guide the sulfuric acid to the location where the copper powder and copper shavings are concentrated, thereby improving the dissolution efficiency.

[0009] Preferably, the end of the porous plate near the liquid outlet is lower than the other end, so that the sulfuric acid can fall downwards and be discharged from the liquid outlet.

[0010] Preferably, a funnel-shaped guide seat is installed on the lower side of the support plate of the tank. The lower opening of the funnel-shaped guide seat is smaller than the upper opening, which can guide the falling sulfuric acid, copper powder and copper shavings, and prevent the copper powder and copper shavings from falling into the position where the sulfuric acid cannot contact them.

[0011] Compared with the prior art, the beneficial effects of this utility model are: With a simple structure, multiple heightening steel frames can raise the raw material stacking position, increasing air circulation and the fluidity of sulfuric acid solution, which can accelerate the dissolution of copper. The perforated plate allows the dissolved raw material on the upper part to fall onto the perforated plate for secondary dissolution, improving the dissolution efficiency. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the tank body of this utility model; Figure 2 This is a structural diagram of the height-increasing steel frame of this utility model.

[0013] Figure label: 1. Perforated plate, 2. Heightening steel frame, 21. Frame structure, 22. Crossbar, 3. Tank body, 4. Funnel-shaped guide seat, 5. Spray pipe, 6. Support plate, 7. Liquid outlet. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0015] This invention addresses the problems of low copper dissolving rate caused by poor air circulation in the copper dissolving tank due to raw material accumulation, copper powder and shavings generated during production, limited surface area of ​​raw materials in contact with sulfuric acid, and thus low copper dissolving rate. Figure 1-2As shown, the following technical solution is provided: a spray-type copper dissolving tank, including a tank body 3, a spray pipe 5 on the top of the tank body 3, a support plate 6 installed on the inner side of the tank body 3, a plurality of raising steel frames 2 on the support plate 6, the raising steel frames 2 being a frame structure made of corrosion-resistant material, a perforated plate 1 installed inside the tank body 3 below the support plate 6, and a liquid outlet 7 installed on one side of the lower end of the tank body 3. By setting multiple raising steel frames 2, the raw material accumulation position can be raised, increasing air circulation and the fluidity of sulfuric acid solution, which can accelerate the dissolution of copper; by setting the perforated plate, the raw material partially dissolved on the upper side can fall onto the perforated plate for secondary dissolution, improving the dissolution efficiency.

[0016] Specifically, tank 3 adopts a multi-layered annular structure, made of 316L stainless steel, with evenly spaced spray holes and connected to an external adjustable-speed sulfuric acid pump to achieve full and uniform coverage of the sulfuric acid solution, preventing localized areas from not contacting the sulfuric acid. Support plate 6 is a circular structure with a mesh-like structure, allowing sulfuric acid solution, copper powder, and copper shavings to fall off; it is also made of 316L stainless steel. The heightening steel frame 2 is made of corrosion-resistant 304 or 316L stainless steel, suitable for high-concentration sulfuric acid scenarios. The frame structure has a pipe diameter of 15-20mm and a wall thickness of 2-3mm, with a single steel frame having a load-bearing capacity ≥20kg, preventing deformation due to material accumulation. The perforated plate 1 is made of 316L stainless steel, with 5-10mm diameter filter holes, allowing only partially dissolved raw materials / copper powder with a diameter <10mm to pass through. Undissolved raw materials with a diameter >10mm remain on the support plate to continue reacting; the plate thickness is 5-8mm to ensure strength.

[0017] Therefore, compared to the traditional structure without a raised steel frame, the raised steel frame 2 elevates the raw material pile by 15-30cm, creating a gap between the raw material pile and the tank bottom and walls. This significantly increases airflow, ensuring a more sufficient oxygen supply for the copper dissolving reaction and preventing localized oxygen deficiency and reaction stagnation caused by raw material accumulation. Some of the dissolved raw material intercepted by the perforated plate 1 can continue to react with the falling sulfuric acid on the perforated plate, improving raw material utilization. In traditional structures, such raw materials are easily discharged directly with the solution, resulting in low utilization and reducing the burden of copper slag treatment in the subsequent filtration system.

[0018] In this embodiment, the heightening steel frame 2 is a cubic or cuboid frame structure 21 made of stainless steel tubing, which facilitates placement, transportation, and stacking, and improves air circulation. The frame structure 21 is manufactured using welding and polishing processes, and all six faces of the frame structure 21 are openwork structures. The regular cubic or cuboid frame structure 21 facilitates manual handling. For example, a single steel frame weighs 3-5 kg, which can be handled and stacked by a single person. Compared with irregular steel frames, the handling efficiency and the amount of raw materials that can be stacked are significantly increased. The openwork rate of the regular frame is over 80%, allowing air to pass through from all six directions of the frame: up, down, left, right, front, and back. This reduces the number of dead ventilation corners inside the raw material pile, thus increasing the copper melting reaction rate.

[0019] The heightening steel frame 2 has at least one horizontal bar 22 installed at the top hollow position. This bar supports the raw materials on the upper side of the heightening steel frame 2, preventing them from entering the interior of the steel frame 2. The horizontal bar 22 can be arranged in a cross shape to intercept long strips of raw materials, such as copper wire and waste foil, preventing them from falling into the interior of the steel frame from the top hollow position. This improves the material retention rate and eliminates the need for frequent disassembly of the steel frame to clean the internal materials, thus improving production continuity.

[0020] In this embodiment, the porous plate 1 is inclined. The inclined structure causes the copper powder and small particles falling onto the porous plate to concentrate at the lower end, increasing the material bulk density. Compared with a horizontal porous plate, the material is dispersed across the entire plate surface, resulting in lower reaction efficiency. The contact time between the sulfuric acid solution and the material is prolonged, increasing the copper powder dissolution rate. Moreover, the inclined structure accelerates the flow of sulfuric acid solution, preventing it from accumulating on the porous plate. During the solution flow, it can also wash away copper slag on the surface of the porous plate, reducing plate hole blockage. Specifically, the porous plate 1 is made of 316L stainless steel, with a hole diameter of 8mm, a thickness of 6mm, and an inclination angle of 5°. It is fixed by four supports, such as a high support height of 25cm, a low support height of 14.5cm, and a height difference of 10.5cm.

[0021] In this embodiment, the end of the porous plate 1 closest to the outlet 7 is lower than the other end, allowing sulfuric acid to fall downwards and be discharged from the outlet 7. The solution flows along the direction from the lower end of the porous plate to the outlet, with no reverse flow, thus improving the solution discharge efficiency. After the reaction, the amount of solution residue in the tank is reduced, and the solution utilization rate is improved. In addition, copper slag concentrated at the lower end of the porous plate, such as incompletely dissolved microparticles, can flow into the outlet along with the solution and enter the subsequent filtration system. There is no need for manual cleaning of the porous plate, reducing downtime and improving production efficiency.

[0022] In this embodiment, a funnel-shaped guide seat 4 is installed on the lower side of the support plate 6 of the tank body 3. The lower opening of the funnel-shaped guide seat 4 is smaller than the upper opening. The funnel-shaped guide seat 4 can concentrate and guide raw materials, such as small copper particles and copper powder, falling from the gap of the support plate to the reaction area of ​​the porous plate 1, preventing the raw materials from deviating from the porous plate 1 and reducing raw material waste. At the same time, the guide seat can collect sulfuric acid solution dripping from the support plate, so that the solution falls in a columnar shape to the raw material pile of the porous plate, improving the solution utilization rate, and the concentrated falling of the solution can enhance the reaction of the raw materials. The scouring effect of the pile accelerates the dissolution of raw materials. Specifically, the funnel-shaped guide seat 4 is made of sulfuric acid-resistant polytetrafluoroethylene or 316L stainless steel, and the funnel taper is set to 30°-45°. The diameter of the upper opening matches the diameter of the support plate 6, and the diameter of the lower opening is 1 / 3-1 / 2 of the upper opening. The height is 20-30cm. It is fixed to the center of the lower surface of the support plate 6 with bolts. The lower opening corresponds to the raw material concentration area of ​​the porous plate 1, ensuring that when the raw material falls from the lower opening of the guide seat, it can accurately fall into the reaction area of ​​the porous plate.

[0023] As one specific embodiment of this example: Raw material preparation: Mix the copper dissolving materials, including small copper plates of 5-10cm square and 20kg of copper wire, for a total weight of 50kg. Ensure that the raw materials are free of impurities such as oil and rust to avoid affecting the copper dissolving reaction.

[0024] Equipment inspection: Check whether the spray pipes are unobstructed and free from blockages, whether the heightening steel frame is securely installed, whether the perforated plate seal is intact, whether the guide seat is centered, and whether the outlet valve is closed.

[0025] Raw material feeding: Spread the mixed raw materials evenly on the four raised steel frames to ensure that the thickness of the raw materials is uniform and there are no places that are too thick or too thin.

[0026] Spray reaction: Start the sulfuric acid pump and spray a 20% concentration, 50℃ sulfuric acid solution evenly onto the surface of the raw materials through the spray pipe 5, controlling the spray flow rate to 8L / min; at the same time, open the outlet valve 7 and control the outlet speed to match the spray flow rate to ensure the solution level in the tank is stable.

[0027] Reaction monitoring: Observe every 30 minutes: ① Raw material dissolution (no local undissolved raw material); ② Solution flow (no accumulation, no leakage); ③ Porous plate reaction (copper powder concentrated at the bottom, no blockage).

[0028] Reaction complete: After 2.5 hours of continuous spraying, it was observed that the raw materials on the raised steel frame were completely dissolved and there was no copper powder residue on the porous plate. The sulfuric acid pump and the outlet valve were then closed, completing one copper dissolving operation.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] Furthermore, in this utility model, descriptions involving terms such as "primary," "secondary," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "primary" or "secondary" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

Claims

1. A spray-type copper melting tank, comprising a tank body (3), characterized in that, The tank (3) is provided with a spray pipe (5) at the top, and a support plate (6) is installed on the inner side of the tank (3). The support plate (6) has multiple heightening steel frames (2). The heightening steel frames (2) are frame structures made of corrosion-resistant materials. A perforated plate (1) is installed inside the tank (3) below the support plate (6). A liquid outlet (7) is installed on one side of the lower end of the tank (3).

2. The spray-type copper melting tank according to claim 1, characterized in that: The height-increasing steel frame (2) is a cubic or cuboid frame structure (21) made of stainless steel tubing.

3. The spray-type copper melting tank according to claim 2, characterized in that: At least one horizontal bar (22) is provided horizontally at the top hollow position of the height-increasing steel frame (2).

4. The spray-type copper melting tank according to claim 3, characterized in that: The porous plate (1) is inclined.

5. The spray-type copper melting tank according to claim 4, characterized in that: The end of the porous plate (1) near the liquid outlet (7) is lower than the other end.

6. The spray-type copper melting tank according to any one of claims 1-5, characterized in that: A funnel-shaped guide seat (4) is installed on the lower side of the support plate (6) of the tank body (3), and the lower opening of the funnel-shaped guide seat (4) is smaller than the upper opening.

Images