Alkaline gold-containing solution recycling system and method

Abstract

The invention provides an alkaline gold-bearing solution recycling system and method.The alkaline gold-bearing solution recycling system comprises a multi-stage gold dissolving tank, a material transferring mechanism, a multi-circulation electrodeposition tank and a vacuum concentrator, and the multi-stage gold dissolving tank is used for leaching and dissolving gold from gold-bearing materials and provided with a discharging end of an alkaline gold-bearing solution; the material transferring mechanism is erected on the multiple stages of gold dissolving grooves and provided with a movable end for carrying materials to sequentially pass through the multiple stages of gold dissolving grooves. The feeding end of the multi-cycle electrodeposition cell is connected with the discharging end of the alkaline gold-containing solution of the gold dissolving tank through a pipeline, and high-gradient multi-cycle electrodeposition ionization of metal elements is carried out on the alkaline gold-containing solution discharged by the gold-containing tank. According to the multi-stage gold dissolving tank, the multi-stage washing tank, the multi-circulation electrodeposition tank, the vacuum concentrator, the circulation water replenishing assembly and the circulation liquid preparation assembly, waste water in the system is evaporated, condensed and recycled, and washing water in the washing tank is used for preparing gold dissolving liquid medicine.

Description

Technical Field

[0001] The present invention relates to the technical field of precious metal recovery, and in particular to a system and method for recycling an alkaline gold-containing solution. Background Art

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

[0003] At present, hydrometallurgical process is a common method for recovering precious metals from gold-containing materials such as discarded circuit boards. This process usually involves dissolving the precious metal elements in the gold-containing materials in chemical reagents to form a precious metal solution, adding a precipitant to react to form a precipitate for solid-liquid separation, and then purifying and reducing to obtain the precious metal. For example, Chinese patent 201710744257.1 discloses a method for recovering precious metals from waste liquid containing precious metals in stages, specifically involving the recovery of precious metals from platinum group metal waste liquid produced by methods such as metal replacement, chemical precipitation, ion exchange, adsorption and electrolysis.

[0004] For the above-mentioned prior art, in the recovery of precious metals from gold-containing materials, a large amount of wastewater is generated by adopting traditional recovery methods. Moreover, due to the addition of various chemical agents, various salts are introduced to form a more complex solution system. The salt content in the wastewater is relatively high. During the treatment process, the salt precipitated after the reaction is reduced by solid-liquid separation, while the soluble salt is still dissolved in the feed liquid. With the continuous generation of production wastewater, the concentration continues to accumulate and increase, and the wastewater treatment problem cannot be effectively solved by filter pressing alone. Direct reuse in production will have a great impact. If stored in a pool, it cannot be discharged due to limited volume. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies, and to provide an alkaline gold-containing solution recycling system and method, so as to solve the technical problem in the prior art that a large amount of waste water is generated in the recovery of precious metals and is difficult to treat.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides an alkaline gold-containing solution circulation recovery system, comprising: A multi-stage gold dissolving tank is used for leaching gold from gold-containing materials and has a discharge end for alkaline gold-containing solution; The material transfer mechanism is mounted on the multi-stage gold dissolving tank and has a movable end for transporting the material to pass through the multi-stage gold dissolving tanks in sequence; A multiple circulation electrowinning tank, whose feed end is connected to the discharge end of the alkaline gold-containing solution of the gold dissolving tank through a pipeline, performs high-gradient multiple electrowinning separation of metal elements on the alkaline gold-containing solution discharged from the gold-containing tank, and has a discharge end for waste liquid; and The vacuum concentrator has a feed end connected to the discharge end of the waste liquid of the multiple circulation electrolytic cell through a pipeline, performs vacuum negative pressure evaporation on the waste liquid after electrolytic deposition and forms condensed water, and has a waste discharge end and a condensed water discharge end.

[0007] In some embodiments, a multi-stage water washing tank is also included, which is arranged adjacent to the multi-stage gold dissolving tank, and is used to sequentially perform multi-stage water washing on the gold-containing material after gold is leached out of the multi-stage gold dissolving tank, and has a discharge end for washing water. The material transfer mechanism is erected between the multi-stage gold dissolving tank and the multi-stage water washing tank, and drives the material to be transferred between each gold dissolving tank and each water washing tank.

[0008] In some embodiments, a circulating water replenishment component is also included, wherein the feed end of the circulating water replenishment component is connected to the discharge end of the condensed water of the vacuum concentrator, and the discharge end of the circulating water replenishment component is connected to the liquid injection end of each washing tank through a branch pipe, and each branch pipe is provided with a water replenishment valve for replenishing washing water in the washing tank.

[0009] In some embodiments, a circulating liquid preparation component is also included, whose feed end is connected to the discharge end of the water washing tank, used to guide the solution in the water 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.

[0010] 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 vacuum concentrator waste material, and is used to introduce the remaining solids and liquids after being processed by the vacuum concentrator for filtration.

[0011] In some embodiments, the filtration drainage channel of the filter press is connected to the feed end of the vacuum concentrator to reintroduce the liquid after filtration into the vacuum concentrator for processing during the next evaporation.

[0012] In some embodiments, 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 respectively connected to the discharge end of the vacuum concentrator condensate water and the liquid inlet end of the circulating water storage tank through pipes, and the two ends of the extraction pump are respectively connected to the discharge end of the circulating water storage tank and the liquid filling end of the water washing tank through pipes.

[0013] In some embodiments, the circulating liquid preparation component includes a liquid pump, a liquid preparation tank and a medicine tank. The two ends of the liquid pump are respectively connected to the feed end of the liquid preparation tank and the discharge end of the water washing tank through pipes, the liquid preparation tank is connected to the injection end of the gold dissolving tank through a pipe, and the medicine tank is connected to the feed end of the liquid preparation tank through a pipe.

[0014] In some embodiments, the multi-cycle electrowinning cell has multiple electrowinning chambers for electrowinning different metal elements.

[0015] In a second aspect, the present invention further provides a method for recycling an alkaline gold-containing solution, which is used in any one of the alkaline gold-containing solution recycling systems described above, comprising the following steps: S1, the gold-containing material is sequentially leached through a multi-stage gold dissolving tank, and then the treated gold-containing material is successively washed in a multi-stage water washing tank; S2. Set a discharge metal concentration standard and keep track of the target metal concentration of each level during the process. As the number of gold dissolution increases, when the concentration of the gold solution in any level of gold dissolution tank reaches the set concentration data standard, it will be discharged into the high-gradient multi-circulation electrowinning tank immediately; S3, high gradient multi-circulation electrowinning cell has multiple electrowinning chambers, gold-containing solution flows into the electrowinning chambers in sequence, and metal elements are electrowinning; S4. The wastewater after electrolysis is introduced into the vacuum concentrator, evaporated and condensed by vacuum negative pressure, and stored through the circulating water replenishment component after condensation, and provides water supply when the washing water needs to be replenished in the washing tank; S5. The remaining solids and a small amount of liquid after treatment by the vacuum concentrator are filtered through a filter press to squeeze the solids dry, and the liquid after filtration is returned to the vacuum concentrator for the next evaporation treatment.

[0016] Compared with the prior art, the alkaline gold-containing solution recycling system and method provided by the present invention evaporates and condenses the waste water in the system for reuse through multi-stage gold dissolving tanks, multi-stage water washing tanks, multiple circulation electrowinning tanks, vacuum concentrators, circulating water replenishment components and circulating liquid preparation components, and uses the washing water in the water washing tank to prepare the gold dissolving solution, thereby achieving the purpose of recycling the solution, recycling the wastewater and recycling the washing water, and reducing the loss of precious metals. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an alkaline gold-containing solution circulation recovery system provided by an embodiment of the present invention; Figure 2 It is a structural block diagram of an alkaline gold-containing solution circulation recovery system provided by an embodiment of the present invention; Figure 3 It is a structural diagram of a material transfer mechanism of an alkaline gold-containing solution circulation recovery system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problem that a large amount of wastewater is generated and difficult to treat in the recovery of precious metals, the present invention provides an alkaline gold-containing solution circulation recovery system, which can realize the reuse of drug solution, wastewater, washing water, reduce the loss of precious metals, and avoid the problems of low recovery rate caused by low concentration discharge, loss of precious metals and waste of drugs caused by new configuration.

[0020] First, see Figure 1 and Figure 2The present invention provides an alkaline gold-containing solution circulation and recovery system, which comprises a multi-stage gold dissolving tank 1, a multi-stage water washing tank 2, a multi-circulation electrolytic tank 3, a vacuum concentrator 4, a circulating water replenishment component 5, a circulating liquid distribution component 6 and a material transfer mechanism 8. The multi-stage gold dissolving tank 1 is used for the gold-containing material to sequentially pass through multiple gold dissolving tanks 1 to leach gold and form an alkaline gold-containing solution, and has a discharge end for the alkaline gold-containing solution, wherein the number of stages of the gold dissolving tank 1 is five, and the five gold dissolving tanks 1 are arranged head to tail in sequence to form a five-stage reaction tank body for sequentially leaching the gold-containing material. The multi-stage water washing tank 2 is arranged adjacent to the multi-stage gold dissolving tank 1, and is used for sequentially washing the gold-containing material with multiple stages of water after leaching the gold, and has a discharge end for washing water, wherein the number of stages of the water washing tank 2 is three, and the three water washing tanks 2 are arranged head to tail in sequence to form a three-stage water washing tank body for sequentially washing the gold-containing material. The material transfer mechanism 8 is mounted on the multi-stage gold dissolving tank 1 and the multi-stage water washing tank 2, and has a movable end for transporting materials, which can transport and transfer materials from each tank body. The feed end of the multiple circulation electrolytic tank 3 is connected to the discharge end of the alkaline gold-containing solution of the gold dissolving tank 1 through a pipeline, and is used to introduce the alkaline gold-containing solution for high-gradient multiple electrolytic separation of metal elements. The gold-containing solution flows into the electrolytic chamber in sequence to perform electrolytic separation of the target metal. The feed end of the vacuum concentrator 4 is connected to the discharge end of the waste liquid of the multiple circulation electrolytic tank 3 through a pipeline, and is used to introduce the waste liquid after electrolytic evaporation under vacuum negative pressure and form condensed water, and has a discharge end for waste material and a discharge end for condensed water. The feed end of the circulating water replenishment component 5 is connected to the discharge end of the condensed water of the vacuum concentrator 4, and the discharge end of the circulating water replenishment component 5 is connected to the injection end of each water washing tank 2 through a branch pipeline, and each branch pipeline is provided with a water replenishment valve for replenishing washing water in the water washing tank. The feeding end of the circulating liquid preparation component 6 is connected to the discharge end of the water washing tank, and is used to guide the solution in the water washing tank 2 to prepare the gold dissolving liquid for the gold dissolving tank 1, and has a liquid discharge end, which is connected to the injection end of each gold dissolving tank 1 through a branch pipe. The waste water generated after electrolysis is reused as washing water after evaporation and condensation, realizing the reuse of waste water, and the washing water after washing the gold-containing material in the water washing tank is used to prepare the liquid, realizing the reuse of washing water and the liquid, reducing the loss of precious metals, and improving the recovery rate.

[0021] Specifically, the material transfer mechanism 8 includes a gantry crane 81 and a storage basket 82 with holes. The storage basket 82 is filled with gold-containing materials, namely, recycled waste chips. The storage basket can be lifted and transferred by the gantry crane 81, and moved above each trough body in a linear direction, and the feeding end of the storage basket is placed in the gold dissolving tank 1 or the water washing tank 2 for gold dissolving or water washing.

[0022] Furthermore, the storage basket 82 is mounted on the storage rack 83 for placing the storage basket, and a clamp is provided at the movable end of the gantry crane 81 for clamping and releasing the storage rack 83 .

[0023] 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. A rotation driving end extends from the upper spur gear, which is used to extend the rotation driving end to the top of the trough body. In addition, a rotation driving member can also be provided on the storage rack 83, and its movable end is connected to the rotation driving end to drive the storage basket to rotate.

[0024] It can be understood that the material transfer mechanism 8 puts the gold-containing material into the storage basket, has the driving function of lifting and lowering the storage basket and lateral movement, and can transfer the storage basket in the multi-stage gold dissolving tank 1 and the multi-stage water washing tank 2 in sequence. In addition, the storage basket 82 can be detached from the storage rack 83, and the storage rack 83 and the storage basket 82 can be reused. In addition, a switchable cover is provided on the storage basket 82, which is used to open the storage basket 82 to put in and take out the internal materials.

[0025] In this embodiment, the system uses an alkaline non-cyanide agent and an alkaline system to treat gold-containing materials, thereby completely separating the target metal from the non-target metal, avoiding the generation of acidic wastewater and the generation of organic matter.

[0026] In this embodiment, the fifth level is the gold dissolving tank 1, and the third level is the water washing tank 2. Each level of the gold dissolving tank 1 and the water washing tank 2 is in a sequential transition relationship, that is, the gold-containing material is first leached in the first level, then to the second level, and then to the fifth level, and then the treated gold-containing material is washed in the three-level water washing tank 2 one by one. During the process, the target metal concentration of each level is always tracked. As the number of gold dissolving increases, the concentration of the gold-containing solution in the gold dissolving tank 1 reaches a certain data standard and is discharged into the high-gradient multiple circulation electrowinning tank 3. The three-level water washing tank 2 is mainly used to wash the gold-containing material that has reacted in the gold dissolving tank 1, dilute and wash the solution of the gold dissolving tank 1 carried by the material, and as the number of washing increases, the concentration of the gold-containing solution in the water washing tank 2 gradually increases. When a certain level of the gold dissolving tank 1 reaches the required discharge, the solution in the water washing tank 2 can be used to configure the gold dissolving agent as the new level of the gold dissolving tank 1. This circulation mode can control the stability of the gold-containing solution index, and avoid the occurrence of low recovery rate caused by low concentration discharge, precious metal loss, and drug waste caused by new configuration.

[0027] It can be understood that the vacuum concentrator 4 is mainly composed of negative pressure evaporator, condenser, vacuum pump and other auxiliary devices. It is an existing mature equipment, which mainly adopts vacuum negative pressure evaporation. Compared with the evaporator of normal pressure, it effectively reduces the boiling point of the solution, thereby greatly improving the evaporation rate and saving the equipment operation cost. In addition, the waste water can be used to supplement the washing water of the washing tank after evaporation and condensation.

[0028] In one embodiment, see Figure 1 and Figure 2 In order to filter the precipitated salt and process the residual liquid to avoid 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 discharge end of the waste of the vacuum concentrator 4, and is used to introduce the remaining solids and liquids after the treatment of the vacuum concentrator 4 for filter pressing. After being treated by the vacuum concentrator 4, only solids and a small amount of liquid remain in the gold-containing solution. After the solids are squeezed dry by the filter press 7, the liquid after the filter pressing is returned for treatment at the next evaporation, which can avoid the problem of liquid accumulation, and the remaining liquid is evaporated and condensed for reuse.

[0029] Furthermore, the filtration drainage channel of the filter press 7 is connected to the feed end of the vacuum concentrator 4, so as to reintroduce the filtration liquid into the vacuum concentrator 4 for processing during the next evaporation.

[0030] In one embodiment, see Figure 2 In order to store the condensed water and replenish it when the washing tank 2 needs to be replenished, 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 respectively connected to the discharge end of the condensed water of the vacuum concentrator 4 and the liquid inlet end of the circulating water storage tank 53 through pipelines, and the two ends of the extraction pump 52 are respectively connected to the discharge end of the circulating water storage tank 53 and the liquid injection end of the washing tank 2 through pipelines. The circulating water replenishment component 5 mainly uses the delivery pump 51 to transport condensed water to the circulating water storage tank 53 for storage. When a washing tank 2 needs to be replenished with washing water, the water in the circulating water storage tank 53 is extracted by the extraction pump 52 and transported to the washing tank 2 for replenishment.

[0031] It can be understood that the pipeline of the extraction pump 52 has multiple branches to each water washing tank 2, and each pipeline is opened and closed by a valve. The valve of the pipeline that needs to be replenished with water in the water washing tank 2 is opened.

[0032] In one embodiment, see Figure 2In order to extract the water in the washing tank 2 and mix it with the reagent, so as to inject the gold dissolving liquid into the gold dissolving tank 1, the circulating liquid mixing component 6 includes a liquid pump 61, a liquid mixing tank 62 and a reagent tank 63. The two ends of the liquid pump 61 are respectively connected to the feed end of the liquid mixing tank 62 and the discharge end of the washing tank 2 through pipelines. The liquid mixing tank 62 is connected to the injection end of the gold dissolving tank 1 through a pipeline, and the reagent tank 63 is connected to the feed end of the liquid mixing tank 62 through a pipeline. The washing water in the washing tank 2 is extracted by the liquid pump 61 and injected into the liquid mixing tank 62. In the liquid mixing tank 62, according to the monitored concentration of the liquid, the mixing ratio is controlled to inject the reagent into the liquid mixing tank 62 through the reagent tank 63, and then the prepared gold dissolving solution is introduced into the gold dissolving tank 1 to be injected.

[0033] It can be understood that the medicine tank 63 is connected to each gold dissolving tank 1 through another pump body and multiple branch pipes, wherein each branch pipe is also provided with a valve, and when injecting, the corresponding valve can be opened.

[0034] In one embodiment, see Figure 2 The multi-circulation electrowinning tank 3 has multiple electrowinning chambers for electrowinning different metal elements, mainly composed of at least four electrowinning chambers, the current and voltage of each electrowinning chamber are controlled separately, and the gold-containing solution flows into the electrowinning chambers in sequence. Different currents and voltages correspond to the electrowinning of different metal elements, achieving the purpose of separation, and purifying non-target metals in the solution at the same time.

[0035] In order to better understand the present invention, the following Figure 1 to Figure 2 The technical scheme of the present invention is described in detail: the gold-containing material is leached through a five-stage gold dissolving tank 1 to dissolve gold, and then washed through a three-stage water washing tank 2; in the gold dissolving tank 1, an alkaline gold-containing solution is generated, and when the target metal concentration reaches the standard, it is emptied into a multiple circulation electrolytic deposition tank 3; the alkaline gold-containing solution is electrolytically deposited through multiple electrolytic deposition chambers in sequence, and different currents and voltages correspond to electrolytic deposition of different metal elements to achieve the purpose of separation, while purifying non-target metals in the solution; the waste liquid after electrolytic deposition is then introduced into a vacuum concentrator 4 for vacuum negative pressure evaporation, and condensed water is formed, which is introduced into a circulating water storage tank 53 in a circulating water replenishment component 5; the solid-liquid mixture produced by concentration is introduced into a filter press 7 for filtration, and the residual liquid produced by filtration is led back to the vacuum concentrator 4; and the gold solution of the gold dissolving tank 1 after being emptied is configured by extracting washing water from the water washing tank 2 through a circulating liquid distribution component 6.

[0036] In a second aspect, the present invention further provides a method for recycling an alkaline gold-containing solution, which is used in any one of the above alkaline gold-containing solution recycling systems, comprising the following steps: S1, the gold-containing material is sequentially leached through the multi-stage gold dissolving tank 1, and then the treated gold-containing material is successively washed in the multi-stage water washing tank 2; S2. Set a discharge metal concentration standard and keep track of the target metal concentration of each level during the process. As the number of gold dissolution increases, when the concentration of the gold solution in any level of gold dissolution tank 1 reaches the set concentration data standard, it is immediately discharged into the high-gradient multi-circulation electrowinning tank 3; S3, high gradient multi-circulation electrowinning cell 3 has multiple electrowinning chambers, into which the gold-containing solution flows in sequence to electrowinning metal elements; S4, the wastewater after electrolysis is introduced into the vacuum concentrator 4, evaporated and condensed by vacuum negative pressure, and stored by the circulating water replenishment component 5 after condensation, and provides water supply when the washing water needs to be replenished in the washing tank 2; S5. The remaining solid and a small amount of liquid after being treated by the vacuum concentrator 4 are filtered by the filter press 7 to dry the solid, and the liquid after filtering is returned to the vacuum concentrator 4 for the next evaporation treatment.

[0037] In this embodiment, the high-gradient multiple-circulation electrolytic cell 3 has at least four electrolytic chambers, and the current and voltage of each electrolytic chamber are controlled separately. The gold-containing solution flows into the electrolytic chambers in sequence. Different currents and voltages correspond to the electrolytic deposition of different metal elements to achieve the separation purpose, while purifying the non-target metals in the solution.

[0038] It can be understood that the water washing tank and the gold dissolving tank are switched with each other, the precious metal solution in the first-stage reaction tank is emptied to the next process flow, and at the same time, the other reaction tanks are adjusted up one level in sequence, and the first-stage water washing tank is added with reagents at the same time, configured as a new last-stage reaction tank, and the original first-stage reaction tank is injected with washing water to adjust to the last-stage water washing tank, which can obtain a more efficient emptying and configuration effect of a new gold dissolving tank. Correspondingly, when the level is raised, the material transfer mechanism is controlled to load the material from the new first-stage reaction tank position, and move to the corresponding next-stage reaction tank position for transfer in sequence. It can be understood that the entire level adjustment process is to set up a position coordinate system for five reaction tanks and three water washing tanks, and fill in the corresponding levels according to the actual situation, a total of eight levels, and transfer the materials from each level in sequence. That is, in terms of control, the level is marked, and the material transfer is based on the level and the corresponding level of the tank body coordinate position, and the material transfer can be carried out according to the level.

[0039] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An alkaline gold-containing solution recycling system, characterized in that: include: A multi-stage gold dissolving tank is used for leaching gold from gold-containing materials and has a discharge end for alkaline gold-containing solution; The material transfer mechanism is mounted on the multi-stage gold dissolving tank and has a movable end for transporting the material to pass through the multi-stage gold dissolving tanks in sequence; A multiple circulation electrowinning tank, whose feed end is connected to the discharge end of the alkaline gold-containing solution of the gold dissolving tank through a pipeline, performs high-gradient multiple electrowinning separation of metal elements on the alkaline gold-containing solution discharged from the gold-containing tank, and has a discharge end for waste liquid; as well as The vacuum concentrator has a feed end connected to the discharge end of the waste liquid of the multiple circulation electrolytic cell through a pipeline, performs vacuum negative pressure evaporation on the waste liquid after electrolytic deposition and forms condensed water, and has a waste discharge end and a condensed water discharge end.

2. The alkaline gold-containing solution recycling system according to claim 1, characterized in that: It also includes a multi-stage water washing tank, which is arranged adjacent to the multi-stage gold dissolving tank and is used for sequentially performing multi-stage water washing on the gold-containing material after gold is leached out of the multi-stage gold dissolving tank, and has a discharge end for washing water. The material transfer mechanism is erected between the multi-stage gold dissolving tank and the multi-stage water washing tank to drive the material to be transferred between each gold dissolving tank and each water washing tank.

3. The alkaline gold-containing solution recycling system according to claim 2, characterized in that: It also includes a circulating water replenishment component, the feed end of the circulating water replenishment component is connected to the discharge end of the condensed water of the vacuum concentrator, the discharge end of the circulating water replenishment component is connected to the liquid injection end of each washing tank through a branch pipe, and each branch pipe is provided with a water replenishment valve for replenishing washing water in the washing tank.

4. The alkaline gold-containing solution recycling system according to claim 2, characterized in that: It also includes a circulating liquid preparation component, whose feed end is connected to the discharge end of the water washing tank, used to guide the solution in the water 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.

5. 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 waste material, and is used to introduce the remaining solids and liquids after being processed by the vacuum concentrator for filter pressing.

6. The alkaline gold-containing solution recycling system according to claim 5, characterized in that: The filtration drainage channel of the filter press is connected to the feed end of the vacuum concentrator, and is used to reintroduce the liquid after filtration into the vacuum concentrator for processing during the next evaporation.

7. The alkaline gold-containing solution recycling system according to claim 3, 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 respectively connected to the discharge end of the vacuum concentrator condensate water and the liquid inlet end of the circulating water storage tank through pipes, and the two ends of the extraction pump are respectively connected to the discharge end of the circulating water storage tank and the liquid filling end of the washing tank through pipes.

8. The alkaline gold-containing solution recycling system according to claim 4, characterized in that: The circulating liquid preparation component includes a liquid pump, a liquid preparation tank and a medicine tank. The two ends of the liquid pump are respectively connected to the feed end of the liquid preparation tank and the discharge end of the washing tank through pipelines. The liquid preparation tank is connected to the injection end of the gold dissolving tank through a pipeline, and the medicine tank is connected to the feed end of the liquid preparation tank through a pipeline.

9. The alkaline gold-containing solution recycling system according to claim 1, characterized in that: The multi-cycle electrolytic cell has a plurality of electrolytic chambers for electrolytically depositing different metal elements.

10. A method for recycling an alkaline gold-containing solution, characterized in that: The alkaline gold-containing solution recycling system as claimed in any one of claims 1 to 8 comprises the following steps: S1, the gold-containing material is sequentially leached through a multi-stage gold dissolving tank, and then the treated gold-containing material is successively washed in a multi-stage water washing tank; S2. Set a discharge metal concentration standard and keep track of the target metal concentration of each level during the process. As the number of gold dissolution increases, when the concentration of the gold solution in any level of gold dissolution tank reaches the set concentration data standard, it will be discharged into the high-gradient multi-circulation electrowinning tank immediately; S3, high gradient multi-circulation electrowinning cell has multiple electrowinning chambers, gold-containing solution flows into the electrowinning chambers in sequence, and metal elements are electrowinning; S4. The wastewater after electrolysis is introduced into the vacuum concentrator, evaporated and condensed by vacuum negative pressure, and stored through the circulating water replenishment component after condensation, and provides water supply when the washing water needs to be replenished in the washing tank; S5. The remaining solids and a small amount of liquid after treatment by the vacuum concentrator are filtered through a filter press to squeeze the solids dry, and the liquid after filtration is returned to the vacuum concentrator for the next evaporation treatment.

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