A sewage treatment device for wastewater containing gold and silver

Abstract

The present invention relates to the technical field of sewage treatment, and specifically to a sewage treatment device for wastewater containing gold and silver, which solves the problems that most of the existing methods for recovering gold and silver in wastewater are single recovery methods, and it is impossible to ensure the full recovery of gold and silver when the content of gold and silver in the wastewater is high or low, and using a single recovery method to treat wastewater results in high operating pressure of the equipment and low recovery efficiency. The device includes a sewage pretreatment mechanism, a secondary separation mechanism, an evaporator and a purifier. A secondary separation mechanism is installed on one side of the sewage pretreatment mechanism, and the sewage pretreatment mechanism and the secondary separation mechanism are connected through a first sewage delivery pipe. An evaporator is installed inside the secondary separation mechanism. By purifying and secondary recovering the wastewater containing gold and silver, the present invention can meet the gold and silver recovery operations at different concentrations and fully remove gold and silver, effectively reducing the recovery pressure and improving the sewage purification effect.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and specifically to a sewage treatment device for wastewater containing gold and silver. Background Technique

[0002] The wastewater contains precious metals such as gold and silver, and these metals have high economic value. By recycling these metals, the waste of resources can be avoided, the reuse of resources can be realized, and reducing pollution is also an important role of wastewater recycling. If the gold-containing wastewater is directly discharged into the environment, it will cause serious pollution to the ecological environment. Through recycling and treatment, the pollution of these harmful substances to the environment can be reduced, and reducing production costs is also an important economic effect of wastewater recycling. By recycling the metal elements in the wastewater, enterprises can reduce the procurement cost of raw materials and improve production efficiency.

[0003] Most of the existing methods for recycling gold and silver in wastewater use a single recycling method for treatment. When the gold and silver content in the wastewater is high or low, it is impossible to ensure the full recovery of gold and silver. Moreover, when using a single recycling method to treat wastewater, the equipment operation pressure is high and the recycling efficiency is low. Therefore, it does not meet the existing requirements, and for this reason, we propose a sewage treatment device for wastewater containing gold and silver. Summary of the Invention

[0004] The purpose of the present invention is to provide a sewage treatment device for wastewater containing gold and silver, so as to solve the problem that most of the existing methods for recycling gold and silver in wastewater use a single recycling method for treatment. When the gold and silver content in the wastewater is high or low, it is impossible to ensure the full recovery of gold and silver. Moreover, when using a single recycling method to treat wastewater, the equipment operation pressure is high and the recycling efficiency is low, which is mentioned in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A sewage treatment device for wastewater containing gold and silver includes a sewage pretreatment mechanism, a secondary separation mechanism, an evaporator and a purifier. A secondary separation mechanism is installed on one side of the sewage pretreatment mechanism. The sewage pretreatment mechanism and the secondary separation mechanism are connected through a first sewage delivery pipe. An evaporator is installed inside the secondary separation mechanism. A purifier is installed on one side of the secondary separation mechanism. The purifier and the sewage pretreatment mechanism are connected through a reflux pipe. The secondary separation mechanism and the purifier are connected through a second sewage delivery pipe. The secondary separation mechanism includes an automatic replacement mechanism, an ion exchange mechanism and an electrolysis mechanism. The ion exchange mechanism and the electrolysis mechanism are installed inside the automatic replacement mechanism. The evaporator is located between the ion exchange mechanism and the electrolysis mechanism.

[0007] Preferably, the input end of the sewage pretreatment mechanism is connected to a sewage input pipeline in a penetrating manner. A cleaning spray rack is installed on the upper end of the sewage pretreatment mechanism. The sewage pretreatment mechanism includes a pretreatment installation box. A sedimentation tank is fixedly installed inside the pretreatment installation box. An impurity removal box is fixedly installed on one side of the sedimentation tank. The sedimentation tank and the impurity removal box are connected in a penetrating manner through a first connecting pipe. A plurality of filtering units arranged linearly are fixedly installed inside the impurity removal box. An adsorption box is fixedly installed on one side of the impurity removal box. The impurity removal box and the adsorption box are connected in a penetrating manner through a second connecting pipe.

[0008] Preferably, a first booster pump is fixedly installed in the middle of the first sewage delivery pipe. A second booster pump is fixedly installed in the middle of the second sewage delivery pipe. A third booster pump is fixedly installed on the outer side of the return pipe. The output end of the purifier is connected to a purified water output pipe in a penetrating manner. A reverse osmosis membrane is provided inside the purifier.

[0009] Preferably, the automatic replacement mechanism includes a support base. An installation frame is fixedly installed on the upper end surface of the support base. A control panel is fixedly installed on the upper end of the installation frame. Two hydraulic cylinders are fixedly installed on one side of the control panel. The two hydraulic cylinders are symmetrically installed with respect to the center of the support base. A transmission seat is fixedly installed at the output ends of the two hydraulic cylinders. A second drive motor is fixedly installed on one side of the transmission seat. A drive wheel is fixedly installed at the output end of the second drive motor. A swing arm is rotatably connected to the outer side of the transmission seat. A connecting plate is fixedly installed on the rear end surface of the transmission seat. A first drive motor is fixedly installed on the rear end of the connecting plate. A sliding seat is slidably connected to the inside of the connecting plate. A transmission screw is installed inside the upper end of the sliding seat.

[0010] Preferably, the ion exchange mechanism includes an ion exchange box. The bottom end of the ion exchange box is fixedly connected to the support base. First-stage input pipes are fixedly provided at both ends of the ion exchange box. Two resin installation plates are slidably connected to the inside of the upper end of the ion exchange box. A first liquid level gauge is fixedly installed at the bottom end of the ion exchange box. A communicating pipe is installed on one side of the first liquid level gauge.

[0011] Preferably, the electrolysis mechanism includes an electrolysis box. The bottom end of the electrolysis box is fixedly connected to the support base. An output pipe is fixedly installed on the front end surface of the electrolysis box. Electrical connection seats are fixedly installed at both ends of the electrolysis box. An electrolysis anode seat is slidably connected to one side of one of the electrical connection seats. An electrolysis cathode seat is slidably connected to one side of the other electrical connection seat. The upper end of the electrolysis box is connected to the evaporator in a penetrating manner through a second-stage input pipe.

[0012] Preferably, both ends of the first sewage delivery pipe are connected to the ion exchange tank through a primary input pipe. The bottom end of the primary input pipe is connected to the evaporator through a connecting pipe. The upper end of the first liquid level gauge penetrates through the support base and is inserted into the inner side of the ion exchange tank. Two partitions are fixedly arranged inside the ion exchange tank. The bottom end of the resin mounting plate is inserted into the middle of the partition. The upper end of the connecting pipe penetrates through the support base and the ion exchange tank and is inserted between the two resin mounting plates.

[0013] Preferably, the middle parts of the ion exchange tank and the electrolysis tank are connected through. Solenoid valves are arranged between the ion exchange tank and the electrolysis tank and inside the secondary input pipe. Both the electrolysis anode seat and the electrolysis cathode seat are electrically connected to the power connection seat. The liquid level height inside the electrolysis tank is lower than the height of the connection parts between the power connection seat, the electrolysis anode seat, and the electrolysis cathode seat.

[0014] Preferably, a chute is arranged on the lower end face of the connecting plate. The upper end of the sliding seat is inserted into the inner side of the chute. The output end of the first driving motor is connected to the driving screw through a coupling. The driving screw is threadedly connected to the sliding seat. The swing arm is detachably connected to the upper end of the electrolysis cathode seat.

[0015] Preferably, the driving wheel is in rolling connection with the swing arm. One end of the swing arm away from the electrolysis cathode seat is sleeved on the outside of the transmission seat. The swing arm is rotatably connected to the transmission seat through a bearing. The swing arm swings reciprocally relative to the center of the transmission seat.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. In the present invention, the sewage is statically settled and precipitated by the sedimentation tank, and the sewage can be filtered at multiple levels through the filtering unit. Then, it is transported to the adsorption tank through the second connecting pipe for further removal of impurities and then transported to the inside of the secondary separation mechanism through the first sewage delivery pipe. The secondary separation mechanism can perform dual removal operations of ion exchange and electrolysis on the wastewater containing gold and silver, which can effectively improve the efficiency of gold and silver recovery. The reverse osmosis membrane arranged inside the purifier can purify the sewage and output it through the purified water output pipe, thereby realizing the effective purification of the sewage.

[0018] 2. In the present invention, the resin in the resin mounting plate can exchange and adsorb gold and silver ions. The sewage can be evaporated and concentrated by the evaporator to increase the concentration of gold and silver ions, reduce the electrolysis cost, and improve the electrolysis efficiency. Then, it is transported to the inside of the electrolysis tank through the secondary input pipe. The electrolytic anode seat and the electrolytic cathode seat can electrolyze the gold and silver ions and deposit the gold and silver ions on the surface of the electrolytic cathode seat. The hydraulic cylinder drives the swing arm, the connecting plate, and the sliding seat to move upward synchronously through the transmission seat, and then the electrolytic cathode seat and the two resin mounting plates can be withdrawn. The second driving motor drives the swing arm to rotate outside the transmission seat through the driving wheel, and then the position of the electrolytic cathode seat can be adjusted, which is convenient for replacing the electrolytic cathode seat and the two resin mounting plates and recycling gold and silver. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall process framework diagram of the present invention;

[0020] Figure 2 is the overall system diagram of the present invention;

[0021] Figure 3 is the structural schematic diagram of the sewage pretreatment mechanism of the present invention;

[0022] Figure 4 is the structural schematic diagram of the secondary separation mechanism of the present invention;

[0023] Figure 5 is the top view of the secondary separation mechanism of the present invention;

[0024] Figure 6 is the bottom view of the secondary separation mechanism of the present invention;

[0025] Figure 7 is the side view of the secondary separation mechanism of the present invention;

[0026] Figure 8 is the structural schematic diagram of the installation of the swing arm of the present invention;

[0027] Figure 9 is the sectional structural schematic diagram of the electrolysis tank of the present invention.

[0028] In the figure: 1. Sewage pretreatment mechanism; 101. Pretreatment installation box; 102. Sedimentation tank; 103. First connecting pipe; 104. Impurity removal box; 105. Filtration unit; 106. Second connecting pipe; 107. Adsorption box; 2. Secondary separation mechanism; 21. Automatic replacement mechanism; 2101. Support base; 2102. Installation frame; 2103. Control panel; 2104. Hydraulic cylinder; 2105. Connecting plate; 2106. First driving motor; 2107. Driving screw; 2108. Sliding seat; 2109. Driving seat; 2110. Second driving motor; 2111. Driving wheel; 2112. Swing arm; 22. Ion exchange mechanism; 2201. Ion exchange box; 2202. Primary input pipe; 2203. Resin installation plate; 2204. First liquid level gauge; 2205. Connecting pipe; 23. Electrolysis mechanism; 2301. Electrolysis box; 2302. Output pipe; 2303. Power connection seat; 2304. Electrolysis anode seat; 2305. Electrolysis cathode seat; 2306. Secondary input pipe; 3. Evaporator; 4. Purifier; 5. Sewage input pipeline; 6. Cleaning spray rack; 7. First sewage delivery pipe; 8. First booster pump; 9. Second sewage delivery pipe; 10. Clean water output pipe; 11. Return pipe; 12. Second booster pump; 13. Third booster pump. Specific implementation mode

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0030] The hydraulic cylinder 2104 (model number HOB80X250-100), the first driving motor 2106 (model number KOM7080), and the second driving motor 2110 (model number GV50-3.7KW-60-S) mentioned in the present invention can all be obtained by purchasing from the market or customizing privately.

[0031] Please refer to Figures 1 to 3 , an embodiment provided by the present invention: A sewage treatment device for wastewater containing gold and silver, including a sewage pretreatment mechanism 1, a secondary separation mechanism 2, an evaporator 3, and a purifier 4. A secondary separation mechanism 2 is installed on one side of the sewage pretreatment mechanism 1. The input end of the sewage pretreatment mechanism 1 is connected through a sewage input pipeline 5. A cleaning spray rack 6 is installed on the upper end of the sewage pretreatment mechanism 1. The sewage pretreatment mechanism 1 and the secondary separation mechanism 2 are connected through a first sewage delivery pipe 7. An evaporator 3 is installed inside the secondary separation mechanism 2. Through the evaporator 3, the sewage can be evaporated and concentrated, increasing the concentration of gold and silver ions, reducing the electrolysis cost, and improving the electrolysis efficiency;

[0032] On one side of the secondary separation mechanism 2, a purifier 4 is installed. The output end of the purifier 4 is connected through a water purification output pipe 10. Inside the purifier 4, a reverse osmosis membrane is provided. The purifier 4 is connected through a return pipe 11 to the sewage pretreatment mechanism 1. A third booster pump 13 is fixedly installed on the outer side of the return pipe 11. The secondary separation mechanism 2 is connected to the purifier 4 through a second sewage delivery pipe 9. A second booster pump 12 is fixedly installed in the middle of the second sewage delivery pipe 9. A first booster pump 8 is fixedly installed in the middle of the first sewage delivery pipe 7. Through the reverse osmosis membrane, the sewage can be purified and output through the water purification output pipe, thereby effectively purifying the sewage;

[0033] The sewage pretreatment mechanism 1 includes a pretreatment installation box 101. Inside the pretreatment installation box 101, a sedimentation tank 102 is fixedly installed. On one side of the sedimentation tank 102, an impurity removal box 104 is fixedly installed. The sedimentation tank 102 is connected through a first connecting pipe 103 to the impurity removal box 104. Inside the impurity removal box 104, a plurality of filtering units 105 arranged linearly are fixedly installed. On one side of the impurity removal box 104, an adsorption box 107 is fixedly installed. The impurity removal box 104 is connected through a second connecting pipe 106 to the adsorption box 107. Through the filtering units 105, the sewage can be filtered at multiple levels, and then the impurities can be further removed through the adsorption box 107.

[0034] Please refer to Figure 1 and Figure 4 As shown in, the secondary separation mechanism 2 includes an automatic replacement mechanism 21, an ion exchange mechanism 22, and an electrolysis mechanism 23. Inside the automatic replacement mechanism 21, the ion exchange mechanism 22 and the electrolysis mechanism 23 are installed. The evaporator 3 is located between the ion exchange mechanism 22 and the electrolysis mechanism 23. Through the ion exchange mechanism 22 and the electrolysis mechanism 23, the gold and silver ions can be fully recovered.

[0035] Please refer to Figures 4 to 8 As shown in, the automatic replacement mechanism 21 includes a support base 2101. On the upper end face of the support base 2101, an installation frame 2102 is fixedly installed. On the upper end of the installation frame 2102, a control panel 2103 is fixedly installed. On one side of the control panel 2103, two hydraulic cylinders 2104 are fixedly installed. The two hydraulic cylinders 2104 are symmetrically installed with respect to the center of the support base 2101. The output ends of the two hydraulic cylinders 2104 are fixedly installed with a transmission seat 2109, so that the hydraulic cylinders 2104 can synchronously drive the swing arm 2112, the connecting plate 2105, and the sliding seat 2108 to move up synchronously through the transmission seat 2109, and the electrolysis cathode seat 2305 and the two resin installation plates 2203 can be pulled out;

[0036] On one side of the transmission seat 2109, a second transmission motor 2110 is fixedly installed. The output end of the second transmission motor 2110 is fixedly installed with a driving wheel 2111. The outer side of the transmission seat 2109 is rotatably connected with a swing arm 2112. The driving wheel 2111 is in rolling connection with the swing arm 2112. One end of the swing arm 2112 far from the electrolytic cathode seat 2305 is sleeved on the outer side of the transmission seat 2109. The swing arm 2112 is rotatably connected with the transmission seat 2109 through a bearing. The swing arm 2112 swings reciprocally relative to the center of the transmission seat 2109, so that the second transmission motor 2110 drives the swing arm 2112 to rotate on the outer side of the transmission seat 2109 through the driving wheel 2111, and then the position of the electrolytic cathode seat 2305 can be adjusted, which is convenient for replacing the electrolytic cathode seat 2305 and the two resin mounting plates 2203;

[0037] The rear end face of the transmission seat 2109 is fixedly installed with a connecting plate 2105. The rear end of the connecting plate 2105 is fixedly installed with a first transmission motor 2106. The inner side of the connecting plate 2105 is slidably connected with a sliding seat 2108. The inner side of the upper end of the sliding seat 2108 is installed with a transmission screw 2107. The lower end face of the connecting plate 2105 is provided with a chute. The upper end of the sliding seat 2108 is inserted into the inner side of the chute. The output end of the first transmission motor 2106 is connected with the transmission screw 2107 through a coupling. The transmission screw 2107 is in threaded connection with the sliding seat 2108, so that the first transmission motor 2106 drives the sliding seat 2108 to slide through the transmission screw 2107, and then the position of the electrolytic cathode seat 2305 can be further adjusted, which is convenient for recovering gold and silver on the electrolytic cathode seat 2305.

[0038] Please refer to Figures 4 to 7 , the ion exchange mechanism 22 includes an ion exchange tank 2201. The bottom end of the ion exchange tank 2201 is fixedly connected with the support base 2101. Both ends of the ion exchange tank 2201 are fixedly provided with primary input pipes 2202. The first sewage delivery pipe 7 is connected to both ends of the ion exchange tank 2201 through the primary input pipes 2202. Two resin mounting plates 2203 are slidably connected to the inner side of the upper end of the ion exchange tank 2201. Two partition plates are fixedly provided inside the ion exchange tank 2201. The bottom end of the resin mounting plate 2203 is inserted into the middle of the partition plate. The resin mounting plate 2203 is positioned and installed through the two partition plates, which is convenient for improving the adsorption rate of gold and silver ions in the ion exchange tank 2201;

[0039] A first liquid level gauge 2204 is fixedly installed at the bottom end of the ion exchange tank 2201. The upper end of the first liquid level gauge 2204 penetrates through the support base 2101 and is inserted into the inner side of the ion exchange tank 2201. A connecting pipe 2205 is installed on one side of the first liquid level gauge 2204. The bottom end of the primary input pipe 2202 is connected to the evaporator 3 through the connecting pipe 2205 in a through manner. The upper end of the connecting pipe 2205 penetrates through the support base 2101 and the ion exchange tank 2201 and is inserted between the two resin mounting plates 2203. The ion exchange mechanism 22 can adsorb gold and silver ions, effectively reducing the concentration of gold and silver ions in the wastewater.

[0040] Please refer to Figures 4 to 9 , the electrolysis mechanism 23 includes an electrolysis tank 2301. The bottom end of the electrolysis tank 2301 is fixedly connected to the support base 2101. An output pipe 2302 is fixedly installed on the front end face of the electrolysis tank 2301. Electric connection seats 2303 are fixedly installed at both ends of the electrolysis tank 2301. An electrolysis anode seat 2304 is slidably connected to one side of one of the electric connection seats 2303, and an electrolysis cathode seat 2305 is slidably connected to one side of the other electric connection seat 2303. The swing arm 2112 is detachably connected to the upper end of the electrolysis cathode seat 2305. The liquid level height inside the electrolysis tank 2301 is lower than the height of the connection parts of the electric connection seats 2303 with the electrolysis anode seat 2304 and the electrolysis cathode seat 2305. The electrolysis anode seat 2304 and the electrolysis cathode seat 2305 are both electrically connected to the electric connection seats 2303. The gold and silver ions can be electrolyzed through the electrolysis anode seat 2304 and the electrolysis cathode seat 2305, and the gold and silver ions are deposited on the surface of the electrolysis cathode seat 2305.

[0041] The upper end of the electrolysis tank 2301 is connected to the evaporator 3 through a secondary input pipe 2306 in a through manner. The middle parts of the ion exchange tank 2201 and the electrolysis tank 2301 are connected in a through manner. Solenoid valves are provided inside both the ion exchange tank 2201 and the electrolysis tank 2301 and inside the secondary input pipe 2306. The two solenoid valves can control the output of the wastewater in the ion exchange tank 2201 to the evaporator 3 and the electrolysis tank 2301.

[0042] In summary, when treating the sewage containing gold and silver wastewater, the sewage is input into the sewage pretreatment mechanism 1 through the sewage input pipeline 5. Specifically, the sewage is statically settled and precipitated by the sedimentation tank 102 and is transported to the multiple filtering units 105 inside the impurity removal tank 104 through the first connecting pipe 103. The multiple filtering units 105 are arranged linearly. Then, the sewage can be filtered in multiple stages through the filtering units 105, and then is transported to the adsorption tank 107 through the second connecting pipe 106 for further removal of impurities and is transported to the inside of the secondary separation mechanism 2 through the first sewage transport pipe 7.

[0043] The secondary separation mechanism 2 is composed of an automatic replacement mechanism 21, an ion exchange mechanism 22, and an electrolysis mechanism 23. The evaporator 3 is located between the ion exchange mechanism 22 and the electrolysis mechanism 23. The first sewage delivery pipe 7 delivers the pretreated sewage to the inner sides of both ends of the ion exchange tank 2201 through two primary input pipes 2202. After the power is turned on, the resin in the resin mounting plate 2203 can exchange and adsorb gold and silver ions. Then, according to the gold and silver ion concentration in the sewage in the ion exchange tank 2201, the sewage output direction is adjusted. Solenoid valves are provided inside both the ion exchange tank 2201 and the electrolysis tank 2301 and inside the secondary input pipe 2306. When the gold and silver ion concentration in the sewage in the ion exchange tank 2201 meets the electrolysis requirement, the ion exchange tank 2201 and the electrolysis tank 2301 are connected through the solenoid valve, and then the sewage can be delivered to the inner side of the electrolysis tank 2301;

[0044] When the gold and silver ion concentration is too low, the sewage is delivered to the inner side of the evaporator 3 through the connecting pipe 2205, so that the sewage can be evaporated and concentrated by the evaporator 3 to increase the gold and silver ion concentration, and then it is delivered to the inner side of the electrolysis tank 2301 through the secondary input pipe 2306. The bottoms of the electrolysis anode seat 2304 and the electrolysis cathode seat 2305 are inserted into the inner side of the electrolysis tank 2301 and are electrically connected to the two power connection seats 2303. Then, the gold and silver ions can be electrolyzed through the electrolysis anode seat 2304 and the electrolysis cathode seat 2305, and the gold and silver ions are deposited on the surface of the electrolysis cathode seat 2305.

[0045] After electrolysis is completed, it is delivered to the inner side of the purifier 4 through the output pipe 2302 and the second sewage delivery pipe 9. Then, the sewage can be purified through the reverse osmosis membrane provided inside the purifier 4 and output through the purified water output pipe 10, thus effectively purifying the sewage and fully recovering the gold and silver ions through the ion exchange mechanism 22 and the electrolysis mechanism 23;

[0046] After the gold and silver ions are recovered, the hydraulic cylinder 2104 is started, so that the hydraulic cylinder 2104 drives the swing arm 2112, the connecting plate 2105, and the sliding seat 2108 to move up synchronously through the transmission seat 2109 under the support of the installation frame 2102. Then, the electrolysis cathode seat 2305 and the two resin mounting plates 2203 can be respectively withdrawn from the inner sides of the electrolysis tank 2301 and the ion exchange tank 2201;

[0047] Then, the second drive motor 2110 is started, so that the second drive motor 2110 drives the swing arm 2112 to rotate outside the transmission seat 2109 through the drive wheel 2111 under the support of the transmission seat 2109. Then, the position of the electrolysis cathode seat 2305 can be adjusted, which is convenient for replacing the electrolysis cathode seat 2305 and the two resin mounting plates 2203 and for recovering gold and silver.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in all respects, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present invention is defined by the appended claims rather than the above description. Accordingly, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A sewage treatment device for wastewater containing gold and silver, comprising a sewage pretreatment mechanism (1), a secondary separation mechanism (2), an evaporator (3) and a purifier (4), characterized in that: A secondary separation mechanism (2) is installed on one side of the sewage pretreatment mechanism (1), the sewage pretreatment mechanism (1) and the secondary separation mechanism (2) are connected through a first sewage conveying pipe (7), an evaporator (3) is installed on the inner side of the secondary separation mechanism (2), a purifier (4) is installed on one side of the secondary separation mechanism (2), the purifier (4) and the sewage pretreatment mechanism (1) are connected through a return pipe (11), the secondary separation mechanism (2) and the purifier (4) are connected through a second sewage conveying pipe (9), the secondary separation mechanism (2) comprises an automatic replacement mechanism (21), an ion exchange mechanism (22) and an electrolysis mechanism (23), the ion exchange mechanism (22) and the electrolysis mechanism (23) are installed on the inner side of the automatic replacement mechanism (21), and the evaporator (3) is located between the ion exchange mechanism (22) and the electrolysis mechanism (23); The automatic replacement mechanism (21) comprises a support base (2101), a mounting frame (2102) is fixedly mounted on the upper end surface of the support base (2101), a control panel (2103) is fixedly mounted on the upper end of the mounting frame (2102), two hydraulic cylinders (2104) are fixedly mounted on one side of the control panel (2103), the two hydraulic cylinders (2104) are symmetrically mounted relative to the center of the support base (2101), a transmission seat (2109) is fixedly mounted on the output ends of the two hydraulic cylinders (2104), and one end of the transmission seat (2109) is fixedly mounted on the output ends of the two hydraulic cylinders (2104). A second transmission motor (2110) is fixedly mounted on the side, a driving wheel (2111) is fixedly mounted on the output end of the second transmission motor (2110), a swing arm (2112) is rotatably connected to the outer side of the transmission seat (2109), a connecting plate (2105) is fixedly mounted on the rear end surface of the transmission seat (2109), a first transmission motor (2106) is fixedly mounted on the rear end of the connecting plate (2105), a sliding seat (2108) is slidably connected to the inner side of the connecting plate (2105), and a transmission screw (2107) is mounted on the inner side of the upper end of the sliding seat (2108); According to the concentration of gold and silver ions in the sewage in the ion exchange mechanism (22), the sewage output direction is adjusted. When the concentration of gold and silver ions in the sewage in the ion exchange mechanism (22) satisfies electrolysis, the ion exchange mechanism (22) is connected to the electrolysis mechanism (23); when the concentration of gold and silver ions is too low, the ion exchange mechanism (22) is connected to the evaporator (3), and the evaporator (3) evaporates and concentrates the sewage to increase the concentration of gold and silver ions, and then the evaporator (3) is connected to the electrolysis mechanism (23); the sewage is electrolyzed in the electrolysis mechanism (23), and the gold and silver ions are deposited on the surface of the electrolysis cathode seat (2305); after the electrolysis is completed, the sewage is transported to the purifier (4) for further purification to achieve the recovery of the gold and silver ions; Subsequently, the hydraulic cylinder (2104) is started, so that the swing arm (2112), the connecting plate (2105) and the sliding seat (2108) are synchronously moved upward, and the electrolytic cathode seat (2305) and the two resin mounting plates (2203) are synchronously pulled out; then, the second transmission motor (2110) is started to adjust the position of the electrolytic cathode seat (2305) to realize the replacement and gold and silver recovery operations.

2. The sewage treatment equipment for gold and silver-containing wastewater according to claim 1, characterized in that: The input end of the sewage pretreatment mechanism (1) is connected to a sewage input pipeline (5), and a cleaning spray rack (6) is installed on the upper end of the sewage pretreatment mechanism (1). The sewage pretreatment mechanism (1) comprises a pretreatment installation box (101), a sedimentation tank (102) is fixedly installed on the inner side of the pretreatment installation box (101), an impurity removal box (104) is fixedly installed on one side of the sedimentation tank (102), the sedimentation tank (102) and the impurity removal box (104) are connected through a first connecting pipe (103), a plurality of linearly arranged filter units (105) are fixedly installed on the inner side of the impurity removal box (104), an adsorption box (107) is fixedly installed on one side of the impurity removal box (104), and the impurity removal box (104) and the adsorption box (107) are connected through a second connecting pipe (106).

3. The sewage treatment equipment for gold and silver-containing wastewater according to claim 2, characterized in that: A first booster pump (8) is fixedly installed in the middle of the first sewage delivery pipe (7), a second booster pump (12) is fixedly installed in the middle of the second sewage delivery pipe (9), a third booster pump (13) is fixedly installed on the outside of the return pipe (11), an output end of the purifier (4) is connected to a purified water output pipe (10), and a reverse osmosis membrane is provided on the inside of the purifier (4).

4. The sewage treatment equipment for gold and silver-containing wastewater according to claim 3 is characterized in that: The ion exchange mechanism (22) comprises an ion exchange box (2201), the bottom end of the ion exchange box (2201) is fixedly connected to the support base (2101), both ends of the ion exchange box (2201) are fixedly provided with a primary input pipe (2202), the inner side of the upper end of the ion exchange box (2201) is slidably connected with two resin mounting plates (2203), the bottom end of the ion exchange box (2201) is fixedly provided with a first liquid level gauge (2204), and a connecting pipe (2205) is installed on one side of the first liquid level gauge (2204).

5. The sewage treatment equipment for gold and silver-containing wastewater according to claim 4, characterized in that: The electrolysis mechanism (23) comprises an electrolysis box (2301), the bottom end of the electrolysis box (2301) is fixedly connected to the support base (2101), an output tube (2302) is fixedly installed on the front end surface of the electrolysis box (2301), and electric connection seats (2303) are fixedly installed at both ends of the electrolysis box (2301), one side of one electric connection seat (2303) is slidably connected to an electrolysis anode seat (2304), and one side of the other electric connection seat (2303) is slidably connected to an electrolysis cathode seat (2305), and the upper end of the electrolysis box (2301) is connected to the evaporator (3) via a secondary input tube (2306).

6. The sewage treatment equipment for gold and silver-containing wastewater according to claim 5, characterized in that: Both ends of the first sewage conveying pipe (7) and the ion exchange box (2201) are connected through a primary input pipe (2202); the bottom end of the primary input pipe (2202) is connected through the evaporator (3) through a connecting pipe (2205); the upper end of the first liquid level gauge (2204) passes through the support base (2101) and is plugged into the inner side of the ion exchange box (2201); two partitions are fixedly provided on the inner side of the ion exchange box (2201); the bottom end of the resin mounting plate (2203) is plugged into the middle of the partition; the upper end of the connecting pipe (2205) passes through the support base (2101) and the ion exchange box (2201) and is plugged into between the two resin mounting plates (2203).

7. The sewage treatment equipment for gold and silver-containing wastewater according to claim 6, characterized in that: The ion exchange box (2201) is connected to the middle of the electrolytic box (2301), solenoid valves are provided between the ion exchange box (2201) and the electrolytic box (2301) and inside the secondary input pipe (2306), the electrolytic anode seat (2304) and the electrolytic cathode seat (2305) are electrically connected to the electric connection seat (2303), and the liquid level inside the electrolytic box (2301) is lower than the height of the connection part between the electric connection seat (2303) and the electrolytic anode seat (2304) and the electrolytic cathode seat (2305).

8. The sewage treatment equipment for gold and silver-containing wastewater according to claim 7, characterized in that: The lower end surface of the connecting plate (2105) is provided with a slide groove, the upper end of the sliding seat (2108) is plugged into the inner side of the slide groove, the output end of the first transmission motor (2106) is connected to the transmission screw (2107) via a coupling, the transmission screw (2107) is connected to the sliding seat (2108) via a threaded connection, and the swing arm (2112) is detachably connected to the upper end of the electrolytic cathode seat (2305).

9. The sewage treatment equipment for gold and silver-containing wastewater according to claim 8, characterized in that: The driving wheel (2111) is rollingly connected to the swing arm (2112); one end of the swing arm (2112) away from the electrolytic cathode seat (2305) is sleeved on the outer side of the transmission seat (2109); the swing arm (2112) and the transmission seat (2109) are rotationally connected via a bearing; the swing arm (2112) swings back and forth relative to the center of the transmission seat (2109).

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