A system and method for recycling an alkaline gold-containing solution

Abstract

The application provides a system and method for recycling alkaline gold-containing solution, and the system comprises a multistage gold dissolving tank, a material transfer mechanism, a multiple circulation electrowinning tank and a vacuum concentrator, the multistage gold dissolving tank is used for gold dissolving of gold-containing material leaching, and has a discharge end of alkaline gold-containing solution; the material transfer mechanism is arranged on the multistage gold dissolving tank and has a movable end through which the material is carried and sequentially passes through the multistage gold dissolving tank; the multiple circulation electrowinning tank is connected with the discharge end of the gold dissolving tank through a pipeline, and high gradient multiple electrowinning separation of metal elements in the alkaline gold-containing solution discharged from the gold dissolving tank is performed.

Description

Technical Field

[0001] This invention relates to the field of precious metal recycling technology, specifically to an alkaline gold-containing solution recycling system and method. Background Technology

[0002] Electronic waste (e-waste) refers to discarded and no longer used electrical or electronic equipment, including discarded televisions, refrigerators, mobile phones, computers, etc. The discarded circuit boards obtained from dismantling these electronic wastes contain a variety of precious metals such as gold, silver, and platinum. Recycling the precious metals in discarded circuit boards not only helps environmental protection and resource conservation, but also brings significant economic and social benefits.

[0003] Currently, hydrometallurgical processes are a common method for recovering precious metals from gold-containing materials such as waste circuit boards. This process typically involves dissolving the precious metal elements in a chemical reagent to form a precious metal solution, adding a precipitant to react and form a precipitate for solid-liquid separation, and then purifying and reducing the solution to obtain the precious metal. For example, Chinese Patent 201710744257.1 discloses a method for staged recovery of precious metals from waste liquid containing precious metals, specifically involving the staged recovery of precious metals from platinum group metal waste liquid generated through methods such as metal replacement, chemical precipitation, ion exchange, adsorption, and electrolysis.

[0004] Regarding the aforementioned existing technologies, traditional recycling methods in the recovery of precious metals from gold-containing materials generate large amounts of wastewater. Furthermore, the addition of various chemical agents introduces multiple salts, creating a more complex solution system with high salt content. During treatment, the salts that precipitate after the reaction are reduced through solid-liquid separation, while soluble salts remain dissolved in the liquid. As production wastewater continues to be generated and its concentration accumulates, pressure filtration alone cannot effectively solve the wastewater treatment problem. Direct reuse in production would have a significant impact. Storing it in a pool is also problematic due to limited capacity and the inability to discharge it. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose an alkaline gold-containing solution recycling system and method to solve the technical problem that a large amount of wastewater is generated and is difficult to treat in the recycling of precious metals in the prior art.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides an alkaline gold-containing solution recycling system, comprising:

[0008] Multi-stage gold leaching tank, used for leaching and dissolving gold-containing materials, with a discharge end for alkaline gold-containing solution;

[0009] The material transfer mechanism is mounted on a multi-stage gold melting tank and has a movable end that transports materials sequentially between the multi-stage gold melting tanks.

[0010] A multi-cycle electrowinning cell, its feed end connected via a pipe to the discharge end of the alkaline gold-containing solution in the gold-dissolving tank, performs high-gradient multi-electrowinning separation of metal elements in the alkaline gold-containing solution discharged from the gold-dissolving tank, and also has a waste liquid discharge end; and

[0011] The vacuum concentrator has its feed end connected to the discharge end of the waste liquid in the multi-circulation electrowinning tank via a pipe. It performs vacuum negative pressure evaporation on the waste liquid after electrowinning and forms condensate. It also has a waste discharge end and a condensate discharge end.

[0012] In some embodiments, a multi-stage washing tank is also included, which is arranged adjacent to a multi-stage gold dissolving tank. It is used to sequentially wash the gold-containing material after it has been leached and dissolved in the multi-stage gold dissolving tank, and has a discharge end for the washing water. The material transfer mechanism is installed between the multi-stage gold dissolving tank and the multi-stage washing tank to drive the material to be transferred in each gold dissolving tank and each washing tank.

[0013] In some embodiments, a circulating water replenishment component is also included. The feed end of the circulating water replenishment component is connected to the discharge end of the condensate of the vacuum concentrator. The discharge end of the circulating water replenishment component is connected to the liquid injection end of each water washing tank through a branch pipe. Each branch pipe is equipped with a water replenishment valve for replenishing the washing tank with washing water.

[0014] In some embodiments, a circulating solution preparation component is further included, the feed end of which is connected to the drain end of the washing tank for guiding the solution in the washing tank to prepare a gold dissolving solution for use in the gold dissolving tank, and has a liquid discharge end, which is connected to the injection end of each gold dissolving tank through a branch pipe.

[0015] In some embodiments, a filter press is also included, wherein the feed end of the filter press is connected to the discharge end of the waste of the vacuum concentrator, for introducing the remaining solids and liquids after the vacuum concentrator treatment for filter pressing.

[0016] In some embodiments, the filter press's filtration discharge channel is connected to the feed end of the vacuum concentrator, for reintroducing the filtered liquid into the vacuum concentrator for processing during the next evaporation.

[0017] In some embodiments, the circulating water replenishment assembly includes a delivery pump, an extraction pump, and a circulating water storage tank. The two ends of the delivery pump are connected to the discharge end of the condensate from the vacuum concentrator and the inlet end of the circulating water storage tank via pipes, respectively. The two ends of the extraction pump are connected to the discharge end of the circulating water storage tank and the injection end of the water washing tank via pipes, respectively.

[0018] In some embodiments, the circulating solution preparation assembly includes a pump, a solution preparation tank, and a reagent tank. The two ends of the pump are connected to the feed end of the solution preparation tank and the drain end of the washing tank via pipes, respectively. The solution preparation tank is connected to the injection end of the gold dissolving tank via a pipe, and the reagent tank is connected to the feed end of the solution preparation tank via a pipe.

[0019] In some embodiments, the multi-cycle electrowinning cell has multiple electrowinning chambers for electrowinning different metal elements.

[0020] Secondly, the present invention also provides a method for recycling alkaline gold-containing solutions, used in any of the alkaline gold-containing solution recycling systems described above, comprising the following steps:

[0021] S1. The gold-containing material is sequentially leached and dissolved in a multi-stage gold-dissolving tank, and then the treated gold-containing material is washed in a multi-stage water washing tank.

[0022] S2. Set a standard for the concentration of discharged metals and track the target metal concentration of each stage at all times during the process. As the number of gold dissolving cycles increases, once the concentration of the gold solution in any stage of the gold dissolving tank reaches the set concentration data standard, it is immediately discharged into the high gradient multi-cycle electrowinning tank.

[0023] S3, the high-gradient multi-cycle electrowinning cell has multiple electrowinning chambers, and the gold-containing solution flows into the electrowinning chambers in sequence to electrowinicate the metal elements;

[0024] S4. The wastewater after electrowinning is introduced into the vacuum concentrator, where it is evaporated and condensed using a vacuum negative pressure method. After condensation, it is stored through a circulating water replenishment component and provides a water source supply when the washing tank needs to be replenished with washing water.

[0025] S5. The remaining solids and a small amount of liquid after being processed by the vacuum concentrator are then filtered by a filter press to dry the solids, and the filtered liquid is returned to the vacuum concentrator for the next evaporation process.

[0026] Compared with the prior art, the alkaline gold-containing solution recycling system and method provided by the present invention evaporates and condenses the wastewater in the system and reuses it through a multi-stage gold dissolving tank, a multi-stage water washing tank, a multi-stage circulating electrodeposition tank, a vacuum concentrator, a circulating water replenishment component, and a circulating solution preparation component. The washing water in the water washing tank is used to prepare the gold dissolving solution, thereby achieving the purpose of reusing the solution, wastewater, and washing water, and reducing the loss of precious metals. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the alkaline gold-containing solution recycling system provided in an embodiment of the present invention;

[0028] Figure 2This is a structural block diagram of the alkaline gold-containing solution recycling system provided in an embodiment of the present invention;

[0029] Figure 3 This is a structural diagram of the material transfer mechanism of the alkaline gold-containing solution recycling system provided in this embodiment of the invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] To address the technical problem of generating large amounts of wastewater that is difficult to treat during precious metal recycling, this invention provides an alkaline gold-containing solution recycling system that enables the reuse of reagents, wastewater, and washing water, reduces precious metal loss, and avoids problems such as low recovery rates, precious metal loss, and waste of reagents due to low-concentration discharge.

[0032] Firstly, please refer to Figure 1 and Figure 2This invention provides an alkaline gold-containing solution recycling system, comprising a multi-stage gold-dissolving tank 1, a multi-stage washing tank 2, a multi-stage circulating electrowinning tank 3, a vacuum concentrator 4, a circulating water replenishment component 5, a circulating solution preparation component 6, and a material transfer mechanism 8. The multi-stage gold-dissolving tank 1 is used for leaching gold-containing materials sequentially through multiple tanks, forming an alkaline gold-containing solution. It has a discharge end for the alkaline gold-containing solution. The gold-dissolving tank 1 has five stages, arranged sequentially end-to-end to form a five-stage reaction tank for sequential leaching of the gold-containing materials. The multi-stage washing tank 2 is arranged adjacent to the multi-stage gold-dissolving tank 1, used for sequential multi-stage washing of the gold-containing materials after leaching, and has a discharge end for the wash water. The washing tank 2 has three stages, arranged sequentially end-to-end to form a three-stage washing tank for sequential cleaning of the gold-containing materials. The material transfer mechanism 8 is mounted on the multi-stage gold dissolving tank 1 and the multi-stage washing tank 2. It has a movable end for transporting materials, allowing for the transfer and handling of materials between the various tanks. The feed end of the multi-stage circulating electrowinning tank 3 is connected via a pipe to the discharge end of the alkaline gold-containing solution in the gold dissolving tank 1. This allows the alkaline gold-containing solution to be introduced for high-gradient multi-stage electrowinning separation of metal elements. The gold-containing solution flows sequentially into the electrowinning chamber for electrowinning separation of the target metal. The feed end of the vacuum concentrator 4 is connected via a pipe to the discharge end of the waste liquid in the multi-stage circulating electrowinning tank 3. This allows the waste liquid after electrowinning to undergo vacuum negative pressure evaporation, forming condensate. It also has discharge ends for both waste and condensate. The feed end of the circulating water replenishment component 5 is connected to the condensate discharge end of the vacuum concentrator 4. The discharge end of the circulating water replenishment component 5 is connected via branch pipes to the liquid injection ends of each washing tank 2. Each branch pipe is equipped with a water replenishment valve for replenishing the washing tanks with washing water. The inlet of the circulating solution preparation component 6 is connected to the outlet of the washing tank, guiding the solution in the washing tank 2 to prepare the gold dissolving solution for use in the gold dissolving tank 1. It also has a liquid outlet, which is connected to the injection outlet of each gold dissolving tank 1 via branch pipes. The wastewater generated after electrowinning is evaporated and condensed for reuse as washing water, achieving wastewater recycling. The washing water from cleaning gold-containing materials in the washing tank is also used to prepare the solution, achieving both washing water and washing solution reuse, reducing precious metal loss, and improving the recovery rate.

[0033] Specifically, the material transfer mechanism 8 includes a gantry crane 81 and a storage basket 82 with holes. The storage basket 82 contains gold-containing materials, namely recycled waste chips. The storage basket can be lifted and transferred by the gantry crane 81 and moved along a linear direction above each tank. The feeding end of the storage basket is placed in the gold melting tank 1 or the water washing tank 2 for gold melting or water washing.

[0034] Furthermore, the storage basket 82 is mounted on the storage rack 83 for placing the storage basket, and the movable end of the gantry crane 81 is equipped with a clamp for clamping and releasing the storage rack 83.

[0035] Furthermore, the storage basket 82 is rotatably connected to the storage rack 83. The storage basket 82 and the storage rack 83 are respectively provided with a meshing spur gear 84, which are arranged vertically. The upper spur gear has a rotating drive end extending to extend the rotating drive end to the top of the groove. In addition, the storage rack 83 may also be provided with a rotating drive component, the movable end of which is connected to the rotating drive end for driving the storage basket to rotate.

[0036] Understandably, the material transfer mechanism 8 loads the gold-containing material into the storage basket, and has the drive functions for lifting and lateral movement of the storage basket, allowing it to be sequentially transferred between the multi-stage gold melting tank 1 and the multi-stage washing tank 2. Furthermore, the storage basket 82 can be detached from the storage rack 83, and both the storage rack 83 and the storage basket 82 are reusable. The storage basket 82 is also equipped with an openable cover for loading and unloading the internal materials.

[0037] In this embodiment, the system uses an alkaline non-cyanide agent to treat gold-containing materials, achieving complete separation of the target metal from the non-target metal, avoiding the generation of acidic wastewater and organic matter.

[0038] In this embodiment, the fifth stage is the gold leaching tank 1, and the third stage is the water washing tank 2. The gold leaching tank 1 and the water washing tank 2 are sequentially transitional stages; that is, the gold-containing material is first leached and dissolved in the first stage, then in the second stage, and so on until the fifth stage. The treated gold-containing material is then washed repeatedly in the third-stage water washing tank 2. During the process, the target metal concentration of each stage is constantly monitored. As the number of leaching cycles increases, the gold solution concentration in the gold leaching tank 1 reaches a certain standard before being discharged into the high-gradient multi-cycle electrowinning tank 3. The third-stage water washing tank 2 is mainly used to clean the gold-containing material that has reacted in the gold leaching tank 1, diluting and washing away the solution carried by the material. As the number of washing cycles increases, the gold solution concentration in the water washing tank 2 gradually increases. When a stage of the gold leaching tank 1 reaches the required discharge level, the solution in the water washing tank 2 can be used to prepare a gold-leaching reagent for the next stage of the gold leaching tank 1. This circulation mode can control the stability of the gold solution indicators and avoid various problems such as low recovery rate, precious metal loss, and waste of reagents due to low-concentration discharge.

[0039] Understandably, the vacuum concentrator 4 mainly consists of a negative pressure evaporator, a condenser, a vacuum pump, and other auxiliary components. It is a mature, existing piece of equipment that primarily uses vacuum negative pressure evaporation. Compared to evaporators operating at atmospheric pressure, this effectively lowers the boiling point of the solution, thereby significantly increasing the evaporation rate and saving on equipment operating costs. Furthermore, the wastewater, after evaporation and condensation, can be used to replenish the washing water in the washing tank.

[0040] In one embodiment, please refer to Figure 1 and Figure 2 To filter the precipitated salts and treat the residual liquid, preventing direct reuse of the residual liquid, the alkaline gold-containing solution recycling system also includes a filter press 7. The feed end of the filter press 7 is connected to the waste discharge end of the vacuum concentrator 4, and is used to introduce the remaining solids and liquids after treatment by the vacuum concentrator 4 for filtration. After treatment by the vacuum concentrator 4, the gold-containing solution contains only solids and a small amount of liquid. The solids are then pressed dry by the filter press 7, and the filtered liquid is returned for processing during the next evaporation, thus avoiding liquid accumulation. The remaining liquid can then be evaporated, condensed, and reused.

[0041] Furthermore, the filter press 7's filter discharge channel is connected to the feed end of the vacuum concentrator 4, for reintroducing the filtered liquid into the vacuum concentrator 4 for processing during the next evaporation.

[0042] In one embodiment, please refer to Figure 2 In order to store condensate and replenish it when the washing tank 2 needs water, the circulating water replenishment component 5 includes a delivery pump 51, an extraction pump 52, and a circulating water storage tank 53. The two ends of the delivery pump 51 are connected to the discharge end of the condensate from the vacuum concentrator 4 and the inlet end of the circulating water storage tank 53 through pipes, respectively. The two ends of the extraction pump 52 are connected to the discharge end of the circulating water storage tank 53 and the injection end of the washing tank 2 through pipes, respectively. The circulating water replenishment component 5 mainly uses the delivery pump 51 to supply condensate to the circulating water storage tank 53 for storage. When a washing tank 2 needs to be replenished with washing water, the extraction pump 52 extracts water from the circulating water storage tank 53 and delivers it to the washing tank 2 for replenishment.

[0043] Understandably, the pump 52 has multiple branches on its pipeline leading to each washing tank 2. Each pipeline is controlled by a valve to open and close. The valve of the pipeline is opened when water needs to be added to a particular washing tank 2.

[0044] In one embodiment, please refer to Figure 2To extract water from the washing tank 2 and prepare a reagent for injection into the gold dissolving tank 1, the circulating solution preparation assembly 6 includes a pump 61, a preparation tank 62, and a reagent tank 63. The pump 61 is connected via pipes to the inlet of the preparation tank 62 and the outlet of the washing tank 2, respectively. The preparation tank 62 is connected via a pipe to the injection outlet of the gold dissolving tank 1, and the reagent tank 63 is connected via a pipe to the inlet of the preparation tank 62. The pump 61 extracts the washing water from the washing tank 2 and injects it into the preparation tank 62. Based on the monitored reagent concentration, the reagent is injected into the preparation tank 62 via the reagent tank 63. Finally, the prepared gold dissolving solution is introduced into the gold dissolving tank 1.

[0045] Understandably, the reagent tank 63 is connected to each gold melting tank 1 via multiple branch pipes through another pump body. Each branch pipe is also equipped with a valve, which can be opened when injecting.

[0046] In one embodiment, please refer to Figure 2 The multi-cycle electrowinning cell 3 has multiple electrowinning chambers for electrowinning different metal elements. It mainly consists of at least four electrowinning chambers, each with individually controlled current and voltage. The gold-containing solution flows into the electrowinning chambers sequentially. Different currents and voltages correspond to the electrowinning of different metal elements, achieving separation and simultaneously purifying non-target metals in the solution.

[0047] To better understand this invention, the following is combined with... Figures 1 to 2 The technical solution of the present invention is described in detail as follows: Gold-containing materials are leached and dissolved in a five-stage gold-dissolving tank 1, and then washed in a three-stage water washing tank 2. In the gold-dissolving tank 1, an alkaline gold-containing solution is generated. When the target metal concentration reaches the standard, it is discharged into a multi-cycle electrowinning tank 3. The alkaline gold-containing solution is electrowinning through multiple electrowinning chambers in sequence. Different currents and voltages correspond to the electrowinning of different metal elements, achieving the separation purpose, while purifying non-target metals in the solution. The waste liquid after electrowinning is then introduced into a vacuum concentrator 4 for vacuum negative pressure evaporation, forming condensate, which is introduced into a circulating water storage tank 53 in a circulating water replenishment component 5. The solid-liquid mixture generated by concentration is introduced into a filter press 7 for filter pressing, and the residual liquid generated by filter pressing is returned to the vacuum concentrator 4. The gold-dissolving solution in the emptied gold-dissolving tank 1 is then prepared by drawing wash water from the water washing tank 2 through a circulating liquid preparation component 6.

[0048] Secondly, this aspect also provides a method for recycling alkaline gold-containing solutions, used in any of the above-mentioned alkaline gold-containing solution recycling systems, comprising the following steps:

[0049] S1. The gold-containing material is sequentially leached and dissolved in a multi-stage gold dissolving tank 1, and then the treated gold-containing material is washed in a multi-stage water washing tank 2.

[0050] S2. Set a standard for the concentration of discharged metals and track the target metal concentration of each stage at all times during the process. As the number of gold dissolving cycles increases, once the concentration of the gold solution in any stage of the gold dissolving tank 1 reaches the set concentration data standard, it is immediately discharged into the high gradient multi-cycle electrowinning tank 3.

[0051] S3, the high-gradient multi-cycle electrowinning cell 3 has multiple electrowinning chambers, and the gold-containing solution flows into the electrowinning chambers in sequence to electrowinicate the metal elements;

[0052] S4. The wastewater after electrowinning is introduced into the vacuum concentrator 4, where it is evaporated and condensed using a vacuum negative pressure method. After condensation, it is stored through the circulating water replenishment component 5 and provides water supply when washing water needs to be replenished in the washing tank 2.

[0053] S5. The remaining solids and a small amount of liquid after being processed by vacuum concentrator 4 are then filtered by filter press 7 to dry the solids, and the filtered liquid is returned to vacuum concentrator 4 for the next evaporation process.

[0054] In this embodiment, the high-gradient multi-cycle electrowinning cell 3 has at least four electrowinning chambers. The current and voltage of each electrowinning chamber are controlled separately. The gold-containing solution flows into the electrowinning chambers sequentially. Different currents and voltages correspond to the electrowinning of different metal elements, achieving the separation purpose, while purifying non-target metals in the solution.

[0055] Understandably, switching between the washing tank and the gold-dissolving tank allows the precious metal solution in the first-stage reaction tank to be drained for the next process step. Simultaneously, the other reaction tanks are sequentially moved up one stage, and reagents are added to the first-stage washing tank to create a new, final-stage reaction tank. The original first-stage reaction tank is then filled with washing water to become the final-stage washing tank. This achieves more efficient draining and the configuration of the new gold-dissolving tank. Correspondingly, moving up one stage controls the material transfer mechanism to feed material from the new first-stage reaction tank position and sequentially move it to the corresponding next-stage reaction tank position for transfer. The entire adjustment process involves establishing a coordinate system for the five reaction tanks and three washing tanks, and assigning stages (eight stages in total) based on the actual situation. Material is then transferred sequentially from each stage. In other words, control is based on stage numbers, while material transfer is performed according to the stage number and the corresponding tank coordinates.

[0056] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A recycling system for an alkaline gold-containing solution, characterized in that, include: A multi-stage gold leaching tank is used for leaching gold-containing materials. It has a discharge end for an alkaline gold-containing solution, which is a solution obtained after leaching the gold-containing materials with an alkaline non-cyanide agent. The material transfer mechanism is mounted on a multi-stage gold melting tank and has a movable end that transports materials sequentially between the multi-stage gold melting tanks. The multi-cycle electrowinning cell has its feed end connected to the discharge end of the alkaline gold-containing solution in the gold dissolving tank via a pipe. It performs high-gradient multi-electrowinning separation of metal elements in the alkaline gold-containing solution discharged from the gold dissolving tank and has a waste liquid discharge end. as well as The vacuum concentrator has its feed end connected to the discharge end of the waste liquid in the multi-circulation electrowinning tank through a pipe. It performs vacuum negative pressure evaporation on the waste liquid after electrowinning and forms condensate. It also has a waste discharge end and a condensate discharge end. It also includes a multi-stage washing tank, which is arranged adjacent to the multi-stage gold dissolving tank. It is used to sequentially wash the gold-containing material after it has been leached and dissolved in the multi-stage gold dissolving tank, and has a discharge end for the washing water. The material transfer mechanism is set between the multi-stage gold dissolving tank and the multi-stage washing tank to drive the material to be transferred in each gold dissolving tank and each washing tank. It also includes a circulating water replenishment component, the feed end of which is connected to the discharge end of the condensate of the vacuum concentrator, and the discharge end of which is connected to the liquid injection end of each water washing tank through branch pipes, and each branch pipe is equipped with a water replenishment valve for replenishing the washing tank with washing water. The process involves switching between a washing tank and a gold-dissolving tank. The precious metal solution in the first-stage gold-dissolving tank is drained and transferred to the next process flow. At the same time, the other gold-dissolving tanks are moved up one stage in sequence. Meanwhile, the first-stage washing tank is filled with reagents to form a new final-stage gold-dissolving tank. The original first-stage gold-dissolving tank is then filled with washing water and adjusted to become the final-stage washing tank. The material transfer mechanism is controlled to feed materials from the new first-stage gold-dissolving tank and move them sequentially to the corresponding next-stage gold-dissolving tank for transfer.

2. The alkaline gold-containing solution recycling system according to claim 1, characterized in that, It also includes a circulating solution preparation component, whose feed end is connected to the drain end of the washing tank, for guiding the solution in the washing tank to prepare the gold dissolving solution for use in the gold dissolving tank, and has a liquid discharge end, which is connected to the liquid injection end of each gold dissolving tank through a branch pipe.

3. The alkaline gold-containing solution recycling system according to claim 1, characterized in that, It also includes a filter press, the feed end of which is connected to the discharge end of the vacuum concentrator, for introducing the remaining solids and liquids after the vacuum concentrator has been processed for filtration.

4. The alkaline gold-containing solution recycling system according to claim 3, characterized in that, The filter press's filtration discharge channel is connected to the feed end of the vacuum concentrator, and is used to reintroduce the filtered liquid into the vacuum concentrator for processing during the next evaporation.

5. The alkaline gold-containing solution recycling system according to claim 1, characterized in that, The circulating water replenishment component includes a delivery pump, an extraction pump, and a circulating water storage tank. The two ends of the delivery pump are connected to the discharge end of the condensate from the vacuum concentrator and the inlet end of the circulating water storage tank via pipes, respectively. The two ends of the extraction pump are connected to the discharge end of the circulating water storage tank and the injection end of the water washing tank via pipes, respectively.

6. The alkaline gold-containing solution recycling system according to claim 2, characterized in that, The circulating solution preparation assembly includes a pump, a solution preparation tank, and a reagent tank. The two ends of the pump are connected to the feed end of the solution preparation tank and the drain end of the washing tank via pipes, respectively. The solution preparation tank is connected to the injection end of the gold dissolving tank via a pipe, and the reagent tank is connected to the feed end of the solution preparation tank via a pipe.

7. The alkaline gold-containing solution recycling system according to claim 1, characterized in that, The multi-cycle electrowinning cell has multiple electrowinning chambers for electrowinning different metallic elements.

8. A method for recycling alkaline gold-containing solutions, characterized in that, The alkaline gold-containing solution recycling system as described in any one of claims 1-7 comprises the following steps: S1. The gold-containing material is sequentially leached and dissolved in a multi-stage gold-dissolving tank, and then the treated gold-containing material is washed in a multi-stage water washing tank. S2. Set a standard for the concentration of discharged metals and track the target metal concentration of each stage at all times during the process. As the number of gold dissolving cycles increases, once the concentration of the gold solution in any stage of the gold dissolving tank reaches the set concentration data standard, it is immediately discharged into the high-gradient multi-circulation electrowinning tank. The water washing tank and the gold dissolving tank switch with each other. The precious metal solution in the first stage of the gold dissolving tank is emptied to the next process flow for treatment. At the same time, the other gold dissolving tanks are sequentially upgraded one stage. The first stage water washing tank is simultaneously filled with reagents to form a new last stage of the gold dissolving tank. The original first stage of the gold dissolving tank is filled with washing water and adjusted to become the last stage water washing tank. The material transfer mechanism is controlled to feed the material from the new first stage of the gold dissolving tank and move it sequentially to the corresponding next stage of the gold dissolving tank for transfer. S3, the high-gradient multi-cycle electrowinning cell has multiple electrowinning chambers, and the gold-containing solution flows into the electrowinning chambers in sequence to electrowinicate the metal elements; S4. The wastewater after electrowinning is introduced into the vacuum concentrator, where it is evaporated and condensed using a vacuum negative pressure method. After condensation, it is stored through a circulating water replenishment component and provides a water source supply when the washing tank needs to be replenished with washing water. S5. The remaining solids and a small amount of liquid after being processed by the vacuum concentrator are then filtered by a filter press to dry the solids, and the filtered liquid is returned to the vacuum concentrator for the next evaporation process.

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