Recovery process for valuable metal in industrial metal waste

Abstract

The invention provides a recovery process for valuable metals in industrial metal scraps, and belongs to the technical field of non-ferrous metal recovery and utilization. The problem that due to different particle sizes of existing industrial metal particle waste, the dissolution efficiency is low, and then the recovery efficiency is low is solved. The method comprises the following steps that S1, crushing and sorting are conducted, specifically, the metal waste is crushed, and granular materials are obtained; then, the granular waste materials are divided into large-particle materials, medium-particle materials and small-particle materials according to the particle size, and the corresponding large-particle materials, medium-particle materials and small-particle materials are obtained after sorting; and S2, graded acid leaching is conducted, specifically, the sorted large-particle materials, medium-particle materials and small-particle materials are put into different acid leaching pools correspondingly, and acid liquor is added for a leaching reaction. Compared with the prior art, continuity and high efficiency of the electrolysis process are achieved.

Description

Technical Field

[0001] This invention belongs to the field of non-ferrous metal recycling technology, and relates to a process for recycling valuable metals from industrial metal waste. Background Technology

[0002] Against the backdrop of increasingly scarce non-ferrous metal resources, recovering valuable metals from industrial metal waste has become an important way to achieve sustainable resource utilization and environmental protection. Currently, hydrometallurgy is the mainstream process for treating such waste. Its general process includes: putting the metal waste into an acid leaching tank for acid leaching treatment, so that the metal enters the solution in the form of ions; then performing solid-liquid separation to obtain a leachate containing metal ions; and finally extracting high-purity metal products from the leachate through an electrolytic deposition process.

[0003] However, the above process suffers from a significant efficiency bottleneck. Metal scrap comes from a wide variety of sources and has diverse physical forms, especially uneven particle size distribution. According to the principles of chemical reaction kinetics, the dissolution rate of particles is closely related to their specific surface area. Small particles dissolve quickly due to their large specific surface area, while large particles dissolve slowly due to their small specific surface area. In current production practices, metal scrap of different particle sizes is usually mixed and fed into the same acid leaching tank for batch processing. This processing mode means that the acid leaching time for the entire batch must be determined by the largest particles, which dissolve the slowest. Even if the small particles have already dissolved completely, the system still needs to wait for the large particles to dissolve completely before the entire tank of leachate can be transported to the subsequent electrolysis process. This "fast waits for slow" phenomenon results in intermittent idleness of the leaching equipment and frequent idle waiting of the electrolysis equipment, severely restricting the continuity and processing efficiency of the overall process and increasing production costs. Summary of the Invention

[0004] The purpose of this invention is to address the problem that existing industrial metal particulate waste has low dissolution efficiency due to different particle sizes, resulting in low recycling efficiency, and to propose a recycling process for valuable metals in industrial metal waste.

[0005] The objective of this invention can be achieved through the following technical solutions: A process for recycling valuable metals from industrial metal waste includes the following steps: S1. Crushing and sorting: Crushing the metal waste to obtain granular material; then sorting the granular waste into three grades: large particles, medium particles and small particles according to particle size, and obtaining the corresponding large particles, medium particles and small particles after sorting. S2, graded acid leaching: The sorted large, medium and small particles are put into different acid leaching tanks and acid is added to carry out the leaching reaction. S3. Sequential electrolytic purification: Monitor the leaching reaction progress of each acid leaching tank, prioritize solid-liquid separation and electrolytic deposition of the leachate containing small particles that have completed the reaction, and recover metals; subsequently, sequentially perform solid-liquid separation and electrolytic deposition of the leachate containing medium and large particles that have completed the reaction, and recover metals. In step S3, the same set of electrolytic deposition equipment is used to recover metals from leachates of different particle size grades in sequence.

[0006] In the above-mentioned recycling process of non-ferrous metals from industrial metal waste, in step S3, the leachate obtained after solid-liquid separation is purified before electrolytic deposition.

[0007] In the above-mentioned recycling process of non-ferrous metals from industrial metal waste, the electrolyte solution generated after electrolytic deposition in step S3 is returned to step S2 and used as acid solution for the leaching reaction of new metal materials. The electrolyte solution can be recycled at least 3 times.

[0008] In the above-mentioned recycling process of non-ferrous metals from industrial metal waste, the leaching residue generated by the solid-liquid separation in step S3 is safely landfilled after solidification and stabilization treatment.

[0009] In the above-mentioned process for recycling non-ferrous metals from industrial metal waste, the purification treatment methods include chemical precipitation and / or solvent extraction.

[0010] In the above-mentioned process for recycling non-ferrous metals from industrial metal waste, the electrolyte after electrolysis can be appropriately replenished with new acid to adjust its acid concentration before returning to step S2.

[0011] In the above-mentioned process for recycling non-ferrous metals from industrial metal waste, the large particles in step S1 have a particle size greater than 2 mm, the medium particles have a particle size of 1 mm-2 mm, and the small particles have a particle size less than 1 mm.

[0012] In the above-mentioned process for recycling non-ferrous metals from industrial metal waste, step S2 is further provided with an automatic resource allocation system, which ensures that the supply intensity of at least one resource for enhancing reaction conditions decreases automatically from the acid leaching tank containing large particles, the acid leaching tank containing medium particles to the acid leaching tank containing small particles.

[0013] In the aforementioned process for recovering non-ferrous metals from industrial metal waste, the enhanced reaction conditions include a stirring power system that achieves decreasing power through a series pumping loop. The stirring power system includes a main pump, a stirring medium supply device connected to the inlet of the main pump, a main conveying pipeline connected to the main pump outlet, and first, second, and third stirring devices respectively installed in the acid leaching tanks containing large, medium, and small particles. The outlet of the main conveying pipeline is connected to the drive inlet of the first stirring device, the drive outlet of the first stirring device is connected to the drive inlet of the second stirring device through a pipeline, and the drive outlet of the second stirring device is connected to the drive inlet of the third stirring device through a pipeline, thus forming a series loop. The driving pressure required by the first, second, and third stirring devices decreases sequentially.

[0014] In the above-mentioned recycling process of non-ferrous metals from industrial metal waste, the first stirring device is a turbine agitator, and the second and third stirring devices are paddle agitators.

[0015] In the above-mentioned recycling process of non-ferrous metals from industrial metal waste, throttle valves are installed at the drive inlets of the first, second, and third stirring devices.

[0016] In the above-mentioned recycling process of non-ferrous metals from industrial metal waste, pressure detection devices are installed at the drive inlets of the first, second, and third stirring devices.

[0017] Compared with the prior art, the present invention has the following significant advantages: (1) The electrolysis process has been made continuous and efficient: By classifying materials according to particle size and leaching them independently, the metal-rich leachate can enter the same electrolysis system in a staggered and sequential manner. After the system finishes processing the leachate of small particles, it can immediately switch to leachate of medium and large particles, realizing the quasi-continuous operation of the electrolysis process and completely eliminating the idle time of the electrolysis equipment waiting for the mixed materials to be leached in the traditional process.

[0018] (2) Significantly reduce the scale and investment cost of key equipment: Since the electrolysis process achieves continuous operation with "one line for multiple uses", the total capacity and scale of core equipment such as electrolyzers and rectifiers required can be significantly reduced to 1 / 2 to 1 / 3 of the original while ensuring the same total production capacity. This directly leads to a significant reduction in equipment investment costs, plant area and infrastructure investment.

[0019] (3) Improve overall process efficiency and shorten production cycle: The "fast wait slow" barrel effect caused by the slow dissolution of large particles has been completely solved. Small particles do not need to wait and can complete the entire process from leaching to electrolysis first, which shortens the average processing cycle of a single batch of materials by more than 30% and improves the overall resource throughput efficiency.

[0020] (4) Optimize energy consumption and operating costs: The near-continuous operation mode of the electrolysis system avoids the energy consumption caused by frequent start-stop and no-load operation. At the same time, for materials with different particle sizes, the leaching conditions (such as acid concentration and temperature) can be optimized to avoid "over-leaching" of small particles, thereby further reducing acid consumption and energy consumption, and effectively controlling the overall operating costs. Attached Figure Description

[0021] Figure 1 This is a process flow diagram of the present invention; Figure 2 This is a flowchart of the stirring power system. Figure 3 This is a schematic diagram of the structural principle of the sorting equipment; Figure 4 This is a schematic diagram of the structural principle of the medium particle collection box after part of the outer shell is cut off; Figure 5 This is a schematic diagram illustrating the structural principle of a large particle collection box or a small particle collection box after part of its outer shell has been removed. In the diagram, 1. Screening cylinder; 2. Feeding component; 3. Rotary drive component; 4. Collection tank; 5. Turntable; 6. Discharge port; 7. Arc-shaped guide surface; 8. Collection box; 9. Guide baffle; 10. Limiting baffle; 11. Inclined screen plate; 12. Upper cavity; 13. Lower cavity; 14. Baffle gate; 15. First screen plate; 16. Second screen plate; 17. Gap area; 18. Sub-collection box; 19. Top door; 20. Bottom door. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0023] like Figure 1 As shown, the recycling process for valuable metals in industrial metal waste includes the following steps: S1. Crushing and sorting: Crushing the metal waste to obtain granular waste; then sorting the granular waste into three grades: large particles, medium particles and small particles according to particle size, and obtaining the corresponding large particles, medium particles and small particles after sorting. S2, graded acid leaching: The sorted large, medium and small particles are put into different acid leaching tanks and acid is added to carry out the leaching reaction. S3. Sequential electrolytic purification: Monitor the leaching reaction progress of each acid leaching tank, prioritize solid-liquid separation and electrolytic deposition of the leachate containing small particles that have completed the reaction, and recover metals; subsequently, sequentially perform solid-liquid separation and electrolytic deposition of the leachate containing medium and large particles that have completed the reaction, and recover metals. In step S3, the same set of electrolytic deposition equipment is used to recover metals from leachates of different particle size grades in sequence.

[0024] The centrifugal sorting process works by using a high-speed rotating disc to throw out metal particle waste. Smaller metal particles, due to their lower inertia, are more easily affected by air resistance and fall into the closer collection area, while larger metal particles, due to their higher inertia, are less affected by air resistance and fall into the farther collection area. Based on this principle, the waste particles are divided into large, medium, and small particles according to their size. Then, the three sizes of waste particles are collected separately through three collection pools.

[0025] The principle of this invention is to separate metal particle waste into large, medium, and small particles based on particle size. After sorting, these particles are fed into different dissolution tanks. Smaller particles, due to their smaller surface area (smaller volume), will be dissolved first. The dissolved acid solution is then subjected to subsequent electrolytic treatment. After the electrolytic line completes the metal extraction, it can be reused in the dissolved acid solution containing the medium-sized particles. By rationally planning the dissolution time of different particle sizes, the electrolytic line can be laid out in a connected manner. In this case, the electrolytic line can achieve three uses on one line, reducing its size to one-third of the original size. This reduction in line size does not compromise the same production capacity, thus indirectly improving the economic benefits and industrial efficiency of the recycling process.

[0026] In step S3, the leachate obtained after solid-liquid separation is purified before electrolytic deposition.

[0027] The electrolyte solution generated after electrolytic deposition in step S3 is returned to step S2 and used as an acid solution for the leaching reaction of new metal materials. The electrolyte solution can be recycled at least 3 times.

[0028] Although the concentration of target metal ions in the post-electrolysis solution has decreased, it usually still contains a high concentration of free acid. This portion of the post-electrolysis solution can be directly returned to the upstream acid leaching process for soaking new metal waste. This approach saves acid consumption, makes full use of the remaining acid, and significantly reduces the cost of purchasing new acid. It also achieves internal recycling of process water and most of the reagents, minimizing wastewater discharge. Furthermore, trace amounts of target metal remaining in the solution can be re-enriched, improving the overall recovery rate.

[0029] Before returning the electrolyte to step S2, fresh acid can be added as needed to adjust its acid concentration.

[0030] The leaching residue generated from solid-liquid separation in step S3 is safely landfilled after solidification and stabilization treatment.

[0031] The purification treatment methods include chemical precipitation and / or solvent extraction.

[0032] Step S2 also includes an automatic resource allocation system, which ensures that the supply intensity of at least one resource for enhancing reaction conditions decreases automatically from the acid leaching tank containing large particles, to the acid leaching tank containing medium particles, and finally to the acid leaching tank containing small particles.

[0033] This technical solution makes reasonable use of resource allocation. The acid leaching tank containing larger particles is inherently slower in acid leaching. Therefore, from the perspective of resource allocation due to external interference, in order to improve the overall acid leaching efficiency, more resources should be allocated to the acid leaching tank containing larger particles.

[0034] like Figure 2 As shown, the enhanced reaction conditions include a stirring power system with decreasing power through a series pumping loop. The stirring power system includes a main pump, a stirring medium supply device connected to the inlet of the main pump, a main conveying pipeline connected to the main board outlet, and first, second, and third stirring devices respectively installed in the acid leaching tanks containing large, medium, and small particles. The outlet of the main conveying pipeline is connected to the drive inlet of the first stirring device, the drive outlet of the first stirring device is connected to the drive inlet of the second stirring device through a pipeline, and the drive outlet of the second stirring device is connected to the drive inlet of the third stirring device through a pipeline, thus forming a series loop. The drive pressure required by the first, second, and third stirring devices decreases sequentially.

[0035] The first mixing device is a turbine mixer, and the second and third mixing devices are paddle mixers.

[0036] Turbine agitators have extremely high shearing force and are suitable for acid leaching tanks containing large particles. They can break down large particles over a certain length to improve acid leaching efficiency. Medium and small particles, on the other hand, have very small particle sizes and can be agitated using paddle agitators. Medium-intensity power is provided for acid leaching tanks containing medium-sized particles, while low-intensity power is provided for acid leaching tanks containing small particles.

[0037] Throttling valves are installed at the drive inlets of the first, second, and third stirring devices.

[0038] The presence of a throttle valve provides precise control, allowing the system to operate automatically or be finely adjusted.

[0039] Pressure detection devices are installed at the drive inlet of the first, second, and third stirring devices.

[0040] The presence of a throttle valve provides the function of monitoring the system status.

[0041] In step S1, the large particles have a diameter greater than 2 mm, the medium particles have a diameter of 1 mm to 2 mm, and the small particles have a diameter less than 1 mm.

[0042] The sorting process in step S1 is completed using sorting equipment.

[0043] like Figure 3 As shown, the sorting equipment includes a screening cylinder 1 raised by a first support leg, a feeding component 2 raised by a second support leg to the upper side of the screening cylinder 1, a rotary drive component 3 raised by a third support to the upper part of the screening cylinder 1, and three collection pools 4 arranged side by side and closely attached to the bottom of the screening cylinder 1. The output shaft of the rotary drive component 3 is set downward and a turntable 5 is fixedly connected to the end of its output shaft. The edge of the turntable 5 is attached to the inner wall of the screening cylinder 1. A discharge port 6 is opened on one side of the screening cylinder 1. Two sets of baffles are vertically arranged on both sides of the discharge port 6 of the screening cylinder 1 to prevent material from being thrown out. The baffle at the material throwing position and the edge of the discharge port 6 of the screening cylinder 1 form an arc-shaped guide surface 7. The three collection pools 4 face the discharge port 6 and are located between the two sets of baffles.

[0044] After the metal granules are fed into the feeding device 2, they fall directly into the screening cylinder 1 and onto the turntable 5. Ideally, the position where they fall onto the turntable 5 should be far away from the position where they are thrown out by the arc-shaped guide surface 7, so as to provide the material with more centrifugal acceleration. The high-speed rotating turntable 5 throws the granules out from the position of the arc-shaped guide surface 7. Under the principle of different inertia, the materials of different particle sizes are thrown to different distances to perform preliminary pre-screening. After being collected by the collection pools 4 at different distances, the screening is completed.

[0045] As a further preferred option, a box opening is provided on the side of the collection pool 4, and a collection box 8 is slidably installed inside the box opening.

[0046] The collection box 8 is the actual tool used to collect materials of different particle sizes. After the material is collected in the collection box 8, the collection box 8 can be directly pulled out from the box opening to retrieve the material.

[0047] like Figure 5 As shown, as a further preferred option, the three collection boxes 8 are divided into a large particle collection box, a medium particle collection box, and a small particle collection box according to their distance from the screen cylinder 1; the baffle where the arc-shaped guide surface 7 is located is a guide baffle 9, and the other baffle is a limiting baffle 10; the large particle collection box is provided with an inclined screen plate 11, which divides the large particle collection box into an upper cavity 12 and a lower cavity 13. The inclined direction of the inclined screen plate 11 gradually slopes downward from the limiting baffle 10 toward the guide baffle 9. The inclined screen plate 11 is densely covered with large holes, and the upper cavity 12 and the lower cavity 13 are connected only through the large holes. The large particle collection box can also be equipped with a baffle door 14, which is connected to the lower cavity 13; the difference between the small particle collection box and the large particle collection box is that the large holes are replaced with small holes.

[0048] like Figure 4 As shown, as a further preferred embodiment, the chamber of the medium particle collection box is provided with a first sieve plate 15 and a second sieve plate 16 from high to low. The first sieve plate 15 is inclined, and its inclination direction gradually slopes downward from the limiting baffle 10 towards the guide baffle 9. The second sieve plate 16 is also inclined, and its inclination direction gradually slopes downward from the guide baffle 9 towards the limiting baffle 10. The first sieve plate 15 is densely perforated with small holes, and the second sieve plate 16 is densely perforated with large holes. The edge of the second sieve plate 16 is completely flush with the inner wall of the chamber, and its coverage area is consistent with the horizontal projected cross-sectional area of ​​the chamber. The second sieve plate 16 divides the chamber into an independent top cavity region and a bottom cavity region, and the top cavity region and the bottom cavity region can only be connected through the large holes. The horizontal projected area of ​​the first sieve plate 15 is smaller than the horizontal projected cross-sectional area of ​​the chamber, and the first sieve plate 15 is located within the chamber. An open gap area 17 is formed between one side of the inner wall of the chamber and its own edge. This gap area 17 is not equipped with any obstructing components, and the material can fall directly from above the first screen plate 15 to the upper surface of the second screen plate 16 through this gap. In the area directly below the first screen plate 15 and above the second screen plate 16, corresponding to the distribution range of the small holes of the first screen plate 15, an independent pull-out sub-collection box 18 is provided. The outer contour of the sub-collection box 18 is adapted to the partial inner wall of the chamber, and it only covers the vertical projection area corresponding to the small holes. The side wall of the medium particle collection box is provided with a sub-port. One end of the sub-collection box 18 extends to the sub-port of the medium particle collection box and can be pulled outward from the sub-port in the horizontal direction. The side wall of the medium particle collection box can also be provided with a top door 19 and a bottom door 20. The top door 19 is located between the first screen plate 15 and the second screen plate 16, and the bottom door 20 is located below the second screen plate 16.

[0049] Among them, materials with a particle size larger than the macropore size are large particles, materials with a particle size smaller than the micropore size are small particles, and materials with a particle size between the micropore size and the macropore size are medium particles.

[0050] The purpose of the large particle collection box is to screen out the small amount of medium-sized particles and small waste particles mixed in with the large particles: large particles larger than the macropore size are left in the upper chamber 12, and the large particles screened out in the upper chamber 12 are retained for the purpose of screening; while medium-sized particles smaller than the macropore size and small waste particles will fall into the lower chamber 13. This part of the mixture will either be repeatedly centrifuged and sorted, or it will be directly used as medium particles for subsequent acid leaching treatment.

[0051] The purpose of the small particle collection box is to screen out the small amount of medium-sized particles and large waste particles mixed in with the small particle material: small waste particles smaller than the aperture diameter will fall into the lower chamber 13, and the small waste particles will be removed from the lower chamber 13 for screening purposes; while large and medium particles larger than the aperture diameter will be left in the upper chamber 12. This part of the mixture will either be repeatedly centrifuged and sorted, or it will be directly used as large particle material for subsequent acid leaching treatment.

[0052] The purpose of the medium particle collection box is to separate the small amount of small particles and large waste particles mixed in with the medium particle material. Small particles smaller than the aperture size will preferentially pass through the apertures of the first screen plate 15 into the sub-collection box 18, while medium particles larger than the aperture size and large waste particles will fall through the notch area 17 onto the second screen plate 16 for secondary screening. During the secondary screening, large particles larger than the aperture size remain on the surface of the second screen plate 16, while medium particles smaller than the aperture size fall into the bottom cavity below the second screen plate 16. Therefore, the material taken out from the sub-collection box 18 is a small amount of small particles, the material taken out from the top door 19 is a small amount of large particles, and the material taken out from the bottom door 20 is the large amount of medium particles selected for this screening purpose.

[0053] The inclined design of the screen plate is entirely to match the centrifugal sorting process. The centrifugal screening process itself is to throw out the particulate waste through centripetal force. The direction of throwing can be regarded as the tangent direction of the arc-shaped guide surface 7. That is, the material is thrown out from the position of the arc-shaped guide surface 7. The forward direction after being thrown out will inevitably move away from the guide baffle 9 where the arc-shaped guide surface 7 is located. That is, the material that finally falls onto the screen plate will accumulate closer to the limiting baffle 10. The centrifugal feeding method of the material is not evenly spread on the screen plate. Therefore, the screen plate is designed with an inclined angle so that the material can fall automatically under the action of gravity and spread out from the surface of the screen plate, which helps to improve the screening efficiency.

[0054] Centrifugal sorting is a preliminary sorting process, which can generally separate particulate waste into large, medium, and small particles. Screening is a secondary sorting process, which aims to remove a small amount of medium and small particles from the large particles after preliminary sorting, remove a small amount of large and small particles from the medium particles, and remove a small amount of large and medium particles from the small particles.

[0055] The advantage of using a two-stage sorting process, first centrifugal sorting and then sieve sorting, is that the processing efficiency is very fast. This is because the centrifugal sorting process is completed immediately after the particulate waste is fed in, resulting in a large throughput. After proper debugging, the accuracy of the centrifugal sorting process can reach over 90%, with only less than 10% of other particle-sized waste mixed in. It is also very easy to pass this less than 10% of interfering particulate waste through the sieve. Since the remaining portion to be screened is less than 10%, the screening process through the sieve is very smooth and clogging is unlikely.

[0056] In the metals industry, technicians typically only think of using sieve sorting to screen metal granular waste. This involves using a sieve layout with multiple sieves of different sizes, with the sieve openings decreasing from top to bottom to gradually separate the particles. However, because the metal granular waste is not pre-screened, a large proportion of particles of various sizes are present, resulting in significant mutual interference during the screening process. This leads to poor screening smoothness, easy clogging, and low sorting efficiency.

[0057] Therefore, the technical solution provided by this invention, which involves first performing coarse centrifugal screening and then fine screening through sieve openings, has significant engineering advantages: First, it solves the problems of clogging and mutual interference. Through centrifugal pre-sorting, the original 100% mixture is transformed into three material streams with a purity of 90%. This makes the subsequent screen plates only need to "check for omissions and fill gaps", with a very small processing volume and extremely high screening efficiency, fundamentally solving the problem of clogging. Secondly, centrifugal sorting is a continuous and dynamic process that is completed instantly. The subsequent screens can also operate at high speed due to their light load and minimal interference. The sorting speed of the entire system is much higher than that of the traditional "waterfall" sorting, which relies on multiple layers of screens for step-by-step sorting. In addition, the double sorting also ensures the stability of subsequent processes and provides raw materials with highly uniform particle size for the acid leaching process. This means that the reaction kinetics in each acid leaching tank are highly consistent, thus making the sequential electrolytic purification process more precise and reliable.

[0058] It should be understood that in the claims and description of this invention, all instances of "comprising..." should be understood as having an open meaning, that is, their meaning is equivalent to "containing at least...", and should not be understood as having a closed meaning, that is, their meaning should not be understood as "containing only...".

[0059] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A process for recovering valuable metals from industrial metal waste, characterized in that, Includes the following steps: S1. Crushing and sorting: Crushing the metal waste to obtain granular material; then sorting the granular waste into at least three grades according to particle size: large particles, medium particles and small particles, and obtaining the corresponding large, medium and small particles. S2, graded acid leaching: The sorted large, medium and small particles are put into different acid leaching tanks and acid is added to carry out the leaching reaction. S3. Sequential electrolytic purification: Monitor the leaching reaction progress of each acid leaching tank, prioritize solid-liquid separation and electrolytic deposition of the leachate containing small particles that have completed the reaction, and recover metals; subsequently, sequentially perform solid-liquid separation and electrolytic deposition of the leachate containing medium and large particles that have completed the reaction, and recover metals. In step S3, the same set of electrolytic deposition equipment is used to recover metals from leachates of different particle size grades in sequence.

2. The process for recycling non-ferrous metals from industrial metal waste according to claim 1, characterized in that: In step S3, the leachate obtained after solid-liquid separation is purified before electrolytic deposition.

3. The process for recycling non-ferrous metals from industrial metal waste according to claim 1, characterized in that: In step S3, the electrolyte solution generated after electrolytic deposition is returned to step S2 and used as an acid solution for the leaching reaction of new metal materials. The electrolyte solution can be recycled at least 3 times.

4. The process for recycling non-ferrous metals from industrial metal waste according to claim 1, characterized in that: In step S3, the leaching residue generated from solid-liquid separation is safely landfilled after solidification and stabilization treatment.

5. The process for recycling non-ferrous metals from industrial metal waste according to claim 2, characterized in that: The purification treatment methods include chemical precipitation and / or solvent extraction.

6. The process for recycling non-ferrous metals from industrial metal waste according to claim 3, characterized in that: Before returning to step S2, the electrolyte is replenished with fresh acid to adjust its acid concentration.

7. The process for recycling non-ferrous metals from industrial metal waste according to claim 1, characterized in that: Step S2 also includes an automatic resource allocation system, which ensures that the supply intensity of at least one resource for enhancing reaction conditions decreases automatically from the acid leaching tank containing large particles, to the acid leaching tank containing medium particles, and finally to the acid leaching tank containing small particles.

8. The process for recycling non-ferrous metals from industrial metal waste according to claim 7, characterized in that: The enhanced reaction conditions resources include a stirring power system that achieves decreasing power through a series pumping loop. This stirring power system includes a main pump, a stirring medium supply device connected to the inlet of the main pump, a main conveying pipeline connected to the main board outlet, and first, second, and third stirring devices respectively installed in the acid leaching tanks containing large, medium, and small particles. The outlet of the main conveying pipeline is connected to the drive inlet of the first stirring device, the drive outlet of the first stirring device is connected to the drive inlet of the second stirring device through a pipeline, and the drive outlet of the second stirring device is connected to the drive inlet of the third stirring device through a pipeline, thus forming a series loop. The driving pressure required by the first, second, and third stirring devices decreases sequentially.

9. The process for recycling non-ferrous metals from industrial metal waste according to claim 8, characterized in that: The first stirring device is a turbine mixer, and the second and third stirring devices are paddle mixers.

10. The process for recycling non-ferrous metals from industrial metal waste according to claim 8, characterized in that: Throttling valves are installed at the drive inlets of the first, second, and third stirring devices; pressure detection devices are installed at the drive inlets of the first, second, and third stirring devices.

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