A method for industrialized continuous production of low-particle-size copper powder by electrodeposition

Abstract

The application discloses an industrialized continuous production method of low-granularity electro-deposited copper powder. The method uses copper-containing materials as raw materials, first carries out copper dissolution at a specific temperature and under a specific sulfuric acid concentration, adds a dispersing agent, and prepares a high-concentration electrolyte; then carries out electro-deposition in an optimized sulfate system, controls electrolysis temperature, total current and composition, and realizes stable precipitation of copper powder. The copper powder slurry obtained through the electro-deposition is subjected to multi-stage countercurrent washing, saponification and high-pressure filter pressing through an integrated washing and dewatering unit, so that impurities and water are effectively removed. The wet powder is reduced under the protection of ammonia decomposition atmosphere, and then subjected to multi-stage screening and on-line addition of an anti-oxidant, so that the electro-deposited copper powder with uniform granularity and good anti-oxidation is finally obtained. The application realizes continuous and stable production of the whole process from the raw materials to the finished products, is strong in systematicness, has a high fine powder rate (≥97%) and low water content (<20%), and is suitable for large-scale industrialized manufacturing.

Description

Technical Field

[0001] This invention relates to the field of non-ferrous metal powder preparation technology, and specifically to a method for preparing low-particle-size electrowinning copper powder suitable for large-scale industrial continuous production. Background Technology

[0002] Electrolytically deposited copper powder is widely used in powder metallurgy, conductive pastes, and electronic materials due to its high purity, good conductivity, and regular particle morphology. With the development of downstream high-end manufacturing, the market has placed more stringent demands on the particle size (especially high fineness ratio) and batch stability of copper powder. The ability to produce high-fineness electrolytically deposited copper powder on a large scale and with stable consistency has become a core element of technological competition in the industry.

[0003] Currently, traditional electrowinning copper powder production processes typically suffer from the following problems: poor compatibility of additive systems with continuous production, leading to unstable fine powder yield; poor integration between post-processing steps (such as washing, dehydration, and anti-oxidation) and the main electrolysis process, resulting in low automation and susceptibility to contamination or oxidation; and fragmented control parameters at each stage of the production process, making it difficult to achieve continuous and stable operation throughout the entire process, thus restricting product quality consistency and large-scale industrial production efficiency. Therefore, developing a highly integrated process with precise and controllable parameters suitable for large-scale continuous and stable production of low-particle-size electrowinning copper powder has significant industrial application value. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a method for preparing high-fineness, low-moisture-content electrowinning copper powder with a complete process, controllable parameters, and suitability for large-scale continuous and stable production. This method achieves efficient, stable, and consistent production of high-quality electrowinning copper powder by optimizing and systematically integrating the entire process from raw materials to finished product.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A continuous production method for electrowinning copper powder, characterized by comprising the following steps: (1) Copper dissolution and electrolyte preparation: Copper-containing materials are dissolved in a solution at 50-90℃ with H2SO4 concentration of 120-200g / L, and a dispersant is added to prepare an electrolyte with a copper ion concentration of 60-90g / L.

[0006] Step (1), as the starting point of the entire process, is crucial in preparing a high-concentration and pure electrolyte. By controlling the temperature and sulfuric acid concentration, copper-containing materials can be effectively dissolved. Adding a specific dispersant allows it to be effectively adsorbed onto the cathode surface or newly formed copper crystal nuclei during subsequent electrolysis, forming a physical barrier that prevents copper atoms from diffusing into the crystal nuclei, thereby forcibly refining the grains and laying the foundation for obtaining stable low-particle-size copper powder. Preferably, the dissolution temperature is 55–85℃, the H2SO4 concentration is 130–180 g / L, and the dissolution time is 6–8 hours to obtain an electrolyte with a copper ion concentration of 75–90 g / L. Under these conditions, the copper dissolution efficiency and economy achieve the best balance.

[0007] As a preferred embodiment, the dispersant in step (1) comprises polyethylene glycol and an auxiliary dispersant, wherein the auxiliary dispersant is selected from at least one of sodium dodecyl sulfate, sodium citrate, triethanolamine, polyvinylpyrrolidone, and gelatin. The amount of polyethylene glycol added is 0.1-2% of the total mass of the electrolyte, and the amount of the auxiliary dispersant added is 0.1-0.5% of the total mass of the electrolyte. This combined dispersant system, through synergistic effect, can more effectively control the grain size and morphology, and improve the fine powder rate.

[0008] (2) Electrolytic powder: The electrolyte obtained in step (1) is adjusted to a concentration of H2SO4 of 130-150 g / L and Cu 2+ A working electrolyte solution with a concentration of 13-18 g / L is injected into the electrolytic cell. A lead-based alloy is used as the anode, and a titanium plate or stainless steel plate is used as the cathode. Direct current electrolysis is carried out at an electrolytic cell temperature of 40-60℃ and a total current intensity of 4800-6000A. The cathode is brushed with powder periodically.

[0009] Step (2) is the core powder-making process. This invention ensures that copper ions are precipitated on the cathode in powder form rather than a dense plate form by precisely controlling a low copper ion concentration and high acidity electrolyte system, combined with a specific cell temperature and high current density. Regular powder brushing, preferably every 1 hour, ensures continuous production and uniform product particle size.

[0010] (3) Washing and dewatering: The copper powder slurry obtained by electrowinning is subjected to multi-stage countercurrent washing. The washing endpoint is SO4 in the wash water. 2- Concentration <0.005 g / L; After washing, soak the copper powder in a saponification solution with a mass fraction of 1.5-2.5% for at least 30 minutes, followed by pressure filtration and dehydration, controlling the filtration pressure at 1.5-3.0 kg / cm². 2 The pressure filtration time is ≥1.5 hours to obtain wet copper powder with a water content of less than 20%.

[0011] Step (3) achieves efficient purification and dehydration of copper powder. Multi-stage countercurrent washing significantly saves pure water consumption while ensuring cleaning effect. Through the saponification solution immersion treatment step, the fatty acid ions (-COO-) in the saponification solution coordinate with the copper atoms or oxide layer on the surface of the copper powder, and the long-chain alkyl groups are arranged outward to form a dense hydrophobic monolayer. This not only helps dehydration, but also initially blocks oxygen and moisture in the air from contacting the copper surface, thus preventing oxidation and discoloration.

[0012] As a preferred embodiment, the saponification solution in step (3) is prepared from industrial soap powder and pure water, wherein the industrial soap powder contains 90% sodium fatty acid by mass, the effective concentration of the saponification solution is 1.4%-2.23%, the pH value is 11.0-13.0, and the saponification temperature is 30-60℃. Under these conditions, the saponification film is formed most uniformly and densely. Preferably, the pressure filter is 2-3 kg / cm². 2 To achieve solid-liquid separation more efficiently.

[0013] (4) Reduction treatment: The wet copper powder obtained in step (3) is reduced under a protective atmosphere of ammonia decomposition gas (H2+N2). The furnace temperature is controlled at 450-580℃ and the flow rate of ammonia decomposition gas is not less than 50m³ / h. 3 / h.

[0014] Step (4) uses a reducing atmosphere to reduce the trace amounts of cuprous oxide that may be generated during the electrowinning process to pure copper, thereby improving the purity of the copper powder and repairing the surface defects of the particles caused by processes such as brushing and washing.

[0015] (5) Screening and post-processing: The reduced copper powder is screened in multiple stages. During the screening process, an antioxidant of 0.8 to 1‰ of the weight of the copper powder is added online. The copper powder that has passed the screening is mixed evenly by a batching machine and then vacuum packaged.

[0016] Step (5) is crucial for ensuring the final product's particle size and antioxidant properties. Adding an antioxidant online, preferably sodium lauryl oleate or sodium oleate, rapidly forms a second, dense, hydrophobic monolayer on the surface of the newly formed copper powder during the sieving and mixing process. This monolayer works synergistically with the saponified film formed in step (3), providing dual protection. The antioxidant molecules exhibit lateral mobility; even if the monolayer is partially damaged, adjacent molecules can slide to cover the defects, preventing rapid oxidation spread and significantly improving the product's stability during storage and use. Finally, through multi-stage sieving and batching, the product's particle size is ensured to be uniform, with a fine powder rate ≥97%, meeting the requirements of high-end applications.

[0017] The dispersants such as polyethylene glycol and sodium citrate added in this invention can be adsorbed on the cathode surface or newly generated copper crystal nuclei, forming a physical barrier to prevent copper atoms from diffusing to the crystal nuclei, thereby forcibly refining the grains and stabilizing the production of low-particle-size copper powder with a fine powder rate of over 97%.

[0018] The saponification liquid added in this invention is prepared from soap powder with a high mass fraction of sodium fatty acid, and the carboxyl group (-COO) in the sodium fatty acid... - It coordinates and adsorbs with copper atoms or oxide layer (CuO / Cu2O) on the surface of copper powder, with long-chain alkyl groups arranged outward to form a dense hydrophobic monolayer, which initially blocks oxygen and moisture in the air from contacting the copper surface and prevents oxidation and discoloration.

[0019] The oleate group of the antioxidant (such as sodium oleate) added in this invention can coordinate with the oxide layer or Cu atoms on the copper surface through the carboxyl group, and can also form a dense hydrophobic monolayer, thereby further preventing the electrowinning copper powder from being oxidized. Moreover, the oleic acid molecules have lateral fluidity on the copper surface. After local film damage, the adjacent molecules can slide to cover the defects. Even if the monolayer is partially damaged, oxidation will not spread rapidly.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Continuous integration of the entire process: This invention integrates multiple processes such as copper dissolution, electrolysis, washing, reduction, sieving and packaging, and precisely controls the key process parameters of each link, realizing the continuous, automated and stable production process, resulting in high production efficiency and consistent product quality.

[0021] 2. High fine powder ratio and low moisture content: Through a specific dispersant system and electrolysis parameters, the crystals are forcibly refined, resulting in a stable product with a fine powder ratio of ≥97%. Optimized washing and pressure filtration processes effectively control the moisture content of the wet powder to below 20%, reducing subsequent reduction energy consumption.

[0022] 3. Excellent antioxidant properties: The innovative dual protection process of "soaking in saponification solution + adding antioxidants online" is used to build a progressive hydrophobic film on the surface of copper powder, which significantly improves the antioxidant capacity of copper powder and ensures product quality.

[0023] 4. Low resource consumption and environmentally friendly: Multi-stage countercurrent washing and water recycling significantly reduce pure water consumption and wastewater discharge. Attached Figure Description

[0024] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0026] Example 1 The sponge copper raw material was placed in a copper dissolving vessel, and a 130 g / L H₂SO₄ solution was added. The mixture was heated to 60°C and stirred with compressed air to dissolve. After 6 hours of dissolution, the Cu in the solution... 2+ When the concentration reaches 60 g / L, 0.5% polyethylene glycol (molecular weight 4000) and 0.1% sodium citrate are added as dispersants. The solution is then subjected to plate and frame filter press and precision filtration to obtain a clear concentrated electrolyte. This concentrated solution is mixed with the system circulating fluid to achieve the following composition for the working electrolyte in the electrolytic cell: 140 g / L H₂SO₄, Cu 2+ 16g / L. The electrolysis system was started, with the total current controlled at 4900A. The tank temperature was stabilized at 50℃ using a plate heat exchanger. Titanium plates were used as the cathode, and powder was brushed on every hour. During electrolysis, the electrolyte composition was analyzed every 4 hours, and stability was maintained by adding concentrated solution or pure water. After 8 hours of electrolysis, the copper powder slurry was discharged into the washing and dewatering unit. It was first washed twice with secondary wash water, which was reused to replenish the system's evaporation. Subsequent washings were performed using pure water in a multi-stage countercurrent process until the 7th wash water showed no white precipitate when tested with barium chloride. Then, a 1.8% (w / w) saponification solution was added, and the mixture was soaked for 30 minutes. The pH of the saponification solution was 12.5, and the saponification temperature was 40℃. After draining the saponification solution, compressed air was used at 1.5 kg / cm². 2 The copper powder was obtained by pressure filtration for 2 hours, and the moisture content was found to be 19%. The wet copper powder was then evenly distributed onto the steel belt of the reduction furnace at a flow rate of 40 m³ / h. 3 The furnace produces ammonia decomposition gas (H2+N2) at a rate of / h, with the furnace temperature set at 480℃ and the steel belt speed corresponding to a frequency of 10Hz. After reduction, the copper powder is initially dispersed and then enters a vibrating screen system for grading. Sodium laurate, which has passed through a 300-mesh sieve, is continuously and evenly added at the inlet of the secondary sieve at a rate of 0.9‰ of the copper powder processing volume. The sieved copper powder is then mixed in a batching machine for 3 minutes. Particle size is measured, and the 300-mesh fine powder rate reaches 97.7%. The batched copper powder is then packaged using an automatic packaging scale, vacuum-sealed, and the weighing error is ±0.14%.

[0027] Example 2 The sponge copper raw material was placed in a copper dissolving vessel, and a 150 g / L H₂SO₄ solution was added. The mixture was heated to 65°C and stirred with compressed air to dissolve. After dissolving for 7 hours, the Cu in the solution... 2+ When the concentration reaches 65 g / L, 1% polyethylene glycol (molecular weight 4000) and 0.1% sodium dodecyl sulfate are added as dispersants. After plate and frame filtration and precision filtration, a clear concentrated electrolyte is obtained. This concentrated electrolyte is then mixed with the system circulating fluid to make the working electrolyte composition in the electrolytic cell: 145 g / L H₂SO₄, Cu 2+10 g / L. Start the electrolysis system, controlling the total current at 5000 A, and stabilize the tank temperature at 55℃ using a plate heat exchanger. Titanium plates are used as the cathode, and powder is brushed on every hour. During electrolysis, the electrolyte composition is analyzed every 4 hours, and stability is maintained by adding concentrated solution or pure water. After 8 hours of electrolysis, the copper powder slurry is discharged into the washing and dewatering unit. It is first washed twice with secondary wash water, which is then reused to supplement the system evaporation. Subsequent washings are performed using pure water in a multi-stage countercurrent process until the 7th wash water test shows no white precipitate. Then, a 1.5% (w / w) saponification solution is added, and the mixture is soaked for 30 minutes. The pH of the saponification solution is 12.6, and the saponification temperature is 42℃. After draining the saponification solution, compressed air is used at 1.5 kg / cm³. 2 The copper powder was obtained by pressure filtration for 1.5 hours, and the moisture content was found to be 20%. The wet copper powder was then evenly distributed onto the steel belt of the reduction furnace at a flow rate of 55 m³ / h. 3 The furnace produces ammonia decomposition gas (H2+N2) at a rate of / h, with the furnace temperature set at 470℃ and the steel belt speed corresponding to a frequency of 10Hz. After reduction, the copper powder is initially dispersed and then enters a vibrating screen system for grading. Sodium oleate, passing through a 300-mesh sieve, is continuously and uniformly added at the inlet of the secondary sieve at a rate of 0.9‰ of the copper powder throughput. The sieved copper powder is then mixed in a batching machine for 3 minutes. Particle size is measured, and the 300-mesh fine powder rate reaches 98.0%. The batched copper powder is then packaged using an automatic packaging scale, vacuum-sealed, and the weighing error is ±0.12%.

[0028] Example 3 The sponge copper raw material was placed in a copper dissolving vessel, and a H2SO4 solution with a concentration of 160 g / L was added. The mixture was heated to 70°C and stirred with compressed air to dissolve. After dissolving for 7 hours, the Cu in the solution... 2+ When the concentration reaches 70 g / L, 0.5% polyethylene glycol (molecular weight 4000) and 0.1% polyvinylpyrrolidone are added as dispersants. After plate and frame filtration and precision filtration, a clear concentrated electrolyte is obtained. This concentrated electrolyte is then mixed with the system circulating fluid to make the working electrolyte composition in the electrolytic cell: 150 g / L H₂SO₄, Cu 2+ 12g / L. Start the electrolysis system, controlling the total current at 5000A, and stabilize the tank temperature at 60℃ using a plate heat exchanger. Titanium plates are used as the cathode, and powder is brushed on every hour. During electrolysis, the electrolyte composition is analyzed every 4 hours, and stability is maintained by adding concentrated solution or pure water. After 8 hours of electrolysis, the copper powder slurry is discharged into the washing and dewatering unit. It is first washed twice with secondary wash water, which is then reused to supplement the system evaporation. Subsequent washings are performed using pure water in a multi-stage countercurrent process until the 7th wash water test shows no white precipitate. Then, a 1.0% (w / w) saponification solution is added, and the mixture is soaked for 40 minutes. The pH of the saponification solution is 12.3, and the saponification temperature is 43℃. After draining the saponification solution, compressed air is used at 2kg / cm². 2The copper powder was filtered under pressure for 1.5 hours to obtain wet copper powder, and the moisture content was found to be 19%. The wet copper powder was then evenly distributed onto the steel belt of the reduction furnace at a flow rate of 50 m³ / h. 3 The furnace produces ammonia decomposition gas (H2+N2) at a rate of / h, with a furnace temperature set at 490℃ and a steel belt speed corresponding to a frequency of 8Hz. After reduction, the copper powder is initially dispersed and then enters a vibrating screen system for grading. Sodium oleate, passing through a 300-mesh sieve, is continuously and uniformly added at the inlet of the secondary sieve at a rate of 0.8‰ of the copper powder throughput. The sieved copper powder is then mixed in a batching machine for 3 minutes. Particle size is measured, and the 300-mesh fine powder rate reaches 97.4%. The batched copper powder is then packaged using an automatic packaging scale, vacuum-sealed, and the weighing error is ±0.14%.

[0029] Example 4 The sponge copper raw material was placed in a copper dissolving vessel, and a 170 g / L H₂SO₄ solution was added. The mixture was heated to 75°C and stirred with compressed air to dissolve. After 7 hours of dissolution, the Cu in the solution... 2+ When the concentration reaches 72 g / L, 0.5% polyethylene glycol (molecular weight 4000) and 0.1% gelatin are added as dispersants. After plate and frame filtration and precision filtration, a clear concentrated electrolyte is obtained. This concentrated electrolyte is then mixed with the system circulating fluid to achieve the following working electrolyte composition in the electrolytic cell: H₂SO₄ 155 g / L, Cu 2+ 13g / L. The electrolysis system was started, with the total current controlled at 5100A. The tank temperature was stabilized at 65℃ using a plate heat exchanger. Titanium plates were used as the cathode, and powder was brushed on every hour. During electrolysis, the electrolyte composition was analyzed every 4 hours, and stability was maintained by adding concentrated solution or pure water. After 8 hours of electrolysis, the copper powder slurry was discharged into the washing and dewatering unit. It was first washed twice with secondary wash water, which was reused to supplement the system evaporation. Subsequent washings were performed using pure water in a multi-stage countercurrent process until the 7th wash water showed no white precipitate when tested with barium chloride. Then, a 1.5% (w / w) saponification solution was added, and the mixture was soaked for 45 minutes. The pH of the saponification solution was 12, and the saponification temperature was 40℃. After draining the saponification solution, compressed air was used at 2Kg / cm³. 2 The copper powder was obtained by pressure filtration for 2 hours, and the moisture content was found to be 18%. The wet copper powder was then evenly distributed onto the steel belt of the reduction furnace at a flow rate of 60 m³ / h. 3 The furnace produces ammonia decomposition gas (H2+N2) at a rate of / h, with the furnace temperature set at 500℃ and the steel belt speed corresponding to a frequency of 10Hz. After reduction, the copper powder is initially dispersed and then enters a vibrating screen system for grading. Sodium laurate, which has passed through a 300-mesh sieve, is continuously and evenly added at the inlet of the secondary sieve at a rate of 8‰ of the copper powder processed. The sieved copper powder is then mixed in a batching machine for 3 minutes. Particle size is measured, and the 300-mesh fine powder rate reaches 97.0%. The batched copper powder is then packaged using an automatic packaging scale, vacuum-sealed, and the weighing error is ±0.15%.

[0030] Example 5 The sponge copper raw material was placed in a copper dissolving vessel, and a H2SO4 solution with a concentration of 180 g / L was added. The mixture was heated to 80°C and stirred with compressed air to dissolve. After 8 hours of dissolution, the Cu in the solution... 2+ When the concentration reaches 75 g / L, 1% polyethylene glycol with a molecular weight of 4000 and 0.5% sodium citrate are added as dispersants. After plate and frame filtration and precision filtration, a clear concentrated electrolyte is obtained. This concentrated electrolyte is then mixed with the system circulating fluid to make the working electrolyte composition in the electrolytic cell: 160 g / L H₂SO₄, Cu 2+ 14 g / L. The electrolysis system was started, with the total current controlled at 5500 A. The tank temperature was stabilized at 70℃ using a plate heat exchanger. Titanium plates were used as the cathode, and powder was brushed on every hour. During electrolysis, the electrolyte composition was analyzed every 4 hours, and stability was maintained by adding concentrated solution or pure water. After 8 hours of electrolysis, the copper powder slurry was discharged and entered the washing and dewatering unit. It was first washed twice with secondary wash water, which was reused to supplement the system evaporation. Subsequent washings were performed using pure water in a multi-stage countercurrent process until the 7th wash water showed no white precipitate when tested with barium chloride. Then, a 2.0% (w / w) saponification solution was added, and the mixture was soaked for 50 minutes. The pH of the saponification solution was 12.8, and the saponification temperature was 35℃. After draining the saponification solution, compressed air was used at 2.0 kg / cm³. 2 The copper powder was obtained by pressure filtration for 2.5 hours, and the moisture content was found to be 17%. The wet copper powder was then evenly distributed onto the steel belt of the reduction furnace at a flow rate of 70 m³ / h. 3 The furnace produces ammonia decomposition gas (H2+N2) at a rate of / h, with the furnace temperature set at 560℃ and the steel belt speed corresponding to a frequency of 10Hz. After reduction, the copper powder is initially dispersed and then enters a vibrating screen system for grading. Sodium oleate, which has passed through a 300-mesh sieve, is continuously and evenly added at the inlet of the secondary sieve at a rate of 1.0‰ of the copper powder processing volume. The sieved copper powder is then mixed in a batching machine for 3 minutes. Particle size is measured, and the fine powder rate reaches 98.5%. The batched copper powder is then packaged using an automatic packaging scale, vacuum-sealed, and the weighing error is ±0.14%.

[0031] As can be seen from the above five embodiments, the method of the present invention can stably produce high-quality electrowinning copper powder with high fine powder ratio (≥97%), low moisture content (≤20%), and small weight error (≤±0.15%) under different combinations of process parameters, demonstrating the wide applicability and stability of the method of the present invention. The loose packing density, flowability, and other physical properties of the copper powder obtained in each embodiment meet the requirements of high-end applications, and the consistency between product batches is good.

Claims

1. An industrial continuous production method for low-particle-size electrodeposited copper powder, characterized in that, Includes the following steps: (1) Copper dissolution and electrolyte preparation: Copper-containing materials are dissolved in a solution at 50-90℃ with H2SO4 concentration of 120-200g / L, and a dispersant is added to prepare an electrolyte with a copper ion concentration of 60-90g / L. (2) Electrolytic powder: The electrolyte obtained in step (1) is adjusted to a concentration of H2SO4 of 130-150 g / L and Cu 2+ A working electrolyte solution with a concentration of 13-18 g / L is injected into the electrolytic cell; a lead-based alloy is used as the anode and a titanium plate or stainless steel plate is used as the cathode. Direct current electrolysis is carried out at an electrolytic cell temperature of 40-60℃ and a total current intensity of 4800-6000A, and the cathode is brushed with powder periodically. (3) Washing and dewatering: The copper powder slurry obtained by electrowinning is subjected to multi-stage countercurrent washing until SO4 in the wash water is reduced. 2- Concentration <0.005g / L; After washing, the copper powder is soaked in a saponification solution with a mass fraction of 1.5-2.5% for more than 30 minutes, and then dehydrated by pressure filtration to obtain wet copper powder with a water content of less than 20%. (4) Reduction treatment: The wet copper powder obtained in step (3) is reduced under an ammonia decomposition gas protective atmosphere. The furnace temperature is controlled at 450-580℃ and the ammonia decomposition gas flow rate is not less than 50m³ / h. 3 / h; (5) Screening and post-processing: The reduced copper powder is screened in multiple stages. During the screening process, an antioxidant of 0.8-1‰ of the copper powder mass is added. The copper powder that has passed the screening is mixed evenly by a batching machine and then vacuum packaged.

2. The industrial continuous production method of low-particle-size electrowinning copper powder according to claim 1, characterized in that, The dispersant in step (1) comprises polyethylene glycol and an auxiliary dispersant, wherein the auxiliary dispersant is selected from at least one of sodium dodecyl sulfate, sodium citrate, triethanolamine, polyvinylpyrrolidone, and gelatin.

3. The industrial continuous production method of low-particle-size electrowinning copper powder according to claim 2, characterized in that, The amount of polyethylene glycol added is 0.1-2% of the total mass of the electrolyte, and the amount of auxiliary dispersant added is 0.1-0.5% of the total mass of the electrolyte.

4. The industrial continuous production method of low-particle-size electrodeposited copper powder according to claim 1, characterized in that, The saponification solution in step (3) is prepared by mixing industrial soap powder and pure water. The industrial soap powder contains 90% sodium fatty acid by mass. The effective concentration of the saponification solution is 1.4%-2.23%, the pH value is 11.0-13.0, and the saponification temperature is 30-60℃.

5. The industrial continuous production method of low-particle-size electrodeposited copper powder according to claim 1, characterized in that, The pressure for dewatering in step (3) is 1.5-3.0 kg / cm², and the dewatering time is ≥1.5 hours.

6. The industrial continuous production method of low-particle-size electrowinning copper powder according to claim 1, characterized in that, The antioxidant mentioned in step (5) is either sodium lauryl ester or sodium oleate.

7. The industrial continuous production method of low-particle-size electrowinning copper powder according to claim 1, characterized in that, The cycle of the powder brushing operation described in step (2) is 1 hour.

8. The industrial continuous production method of low-particle-size electrodeposited copper powder according to any one of claims 1-7, characterized in that, The fine powder rate of the copper powder obtained after multi-stage sieving in step (5) is ≥97%.

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