A device and method for treating wastewater from potassium gold cyanide production

Abstract

This invention belongs to the field of wastewater treatment technology, and specifically relates to a device and method for treating wastewater from potassium gold cyanide production. The device includes a high-concentration wastewater treatment line, a low-concentration wastewater treatment line, and a PLC controller. The high-concentration wastewater treatment line includes a high-concentration wastewater pipeline, on which a high-concentration wastewater equalization tank and a filtration pretreatment component are sequentially installed. This invention provides dual-line separation treatment for high-concentration and low-concentration potassium gold cyanide production wastewater. The high-concentration wastewater undergoes electrolytic gold extraction to achieve efficient recovery of elemental gold and in-situ pre-cyanide removal. The low-concentration wastewater and the high-concentration wastewater after gold extraction undergo resin adsorption for specific recovery of trace amounts of gold and breaking down the gold-cyanide complexation barrier. Subsequent unified oxidation removes cyanide, thus accurately recovering gold resources, preventing precious metal loss, significantly reducing reagent energy consumption and treatment costs, and ensuring more thorough staged cyanide removal and detoxification. This also strictly controls the risk of highly toxic HCN leakage, ensures safe disposal, achieves stable effluent compliance, and reduces hazardous waste production.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a device and method for treating wastewater from potassium gold cyanide production. Background Technology

[0002] Potassium gold cyanide is a high-purity precious metal cyano complex. It is a highly toxic chemical under strict national control and is also a core raw material for precision electroplating gold processes. It is widely used in functional gold plating of printed circuit boards, precision connectors, aerospace and automotive electronic components in the electronics and information industry, decorative gold plating of high-end jewelry, precious watches and handicrafts, as well as in pharmaceutical preservation and the preparation of precious metal catalysts.

[0003] In the industrial production of potassium gold cyanide, the mainstream method is electrolytic synthesis, using high-purity gold sheets as the anode and potassium cyanide solution as the electrolyte. The finished product is obtained through electrolytic complexation, cooling crystallization, recrystallization, washing, and drying. The entire production process generates two types of cyanide-containing wastewater with vastly different water quality characteristics: one type is high-concentration cyanide-containing wastewater, mainly from electrolytic cell residues and crystallization mother liquor. This type of wastewater has a total cyanide concentration of 1000–5000 mg / L, a complexed gold content of 50–200 mg / L, and a pH value maintained in a strongly alkaline range of 11–13. The cyanide in this wastewater mainly exhibits a complexation stability constant of lgK. The core form of dicyanohydrin (I) ions [Au(CN)2]⁻ is recognized as a highly toxic and difficult-to-degrade pollutant in the field of industrial wastewater treatment. Another type is low-concentration cyanide-containing wastewater, which mainly comes from product washing water, workshop and equipment rinsing water, exhaust gas treatment spray wastewater, laboratory wastewater, and initial rainwater in production pollution areas. The total cyanide concentration of this type of wastewater is mostly 50-500 mg / L, and the content of complexed gold is 5-50 mg / L. Although the pollutant concentration is lower than that of high-concentration wastewater, the water volume can reach 80%-90%, and it also contains a large amount of complexed cyanide and free cyanide, which poses an extremely high environmental safety risk.

[0004] Currently, the industry generally uses the same treatment processes for cyanide-containing wastewater from ordinary electroplating and gold mining as for the treatment of wastewater from potassium gold cyanide production. Most production enterprises do not differentiate between high-concentration and low-concentration wastewater; instead, they mix all production wastewater for centralized treatment. The mainstream treatment processes are primarily chemical oxidation processes such as alkaline chlorination and hydrogen peroxide oxidation, supplemented by electrolytic oxidation, activated carbon adsorption, and flocculation sedimentation. However, these existing treatment methods have several unresolved technical drawbacks in practical industrial applications, as detailed below: First, the mixed-treatment centralized model suffers from severe resource waste and an imbalance in treatment efficiency. High-concentration wastewater contains extremely high levels of gold, which has significant recycling value. Mixing it with low-concentration wastewater drastically dilutes the gold concentration, directly increasing the difficulty and efficiency of subsequent gold recovery. Most existing processes focus solely on cyanide detoxification, completely neglecting gold resource recovery from the wastewater, resulting in a serious loss of precious metal resources and significantly reducing the economic benefits for production enterprises. Simultaneously, the mixed wastewater quality fluctuates greatly. Intermittent discharge of high-concentration wastewater can create severe shock loads on the treatment system, easily leading to equipment imbalances and unstable treatment effects. To cope with peak water quality, enterprises must significantly increase reagent dosages and implement redundant equipment designs, resulting in severe waste of reagents and energy, and significantly increasing the overall operating cost of wastewater treatment.

[0005] Secondly, existing processes are incomplete in breaking down the cyanide complex, resulting in effluent that cannot consistently meet environmental control requirements. The cyanide in the wastewater from potassium gold cyanide production is primarily composed of the highly stable [Au(CN)2]⁻ complex. Existing conventional chemical oxidation processes can only efficiently degrade free cyanide and weakly stable metal cyanide complexes, exhibiting extremely low efficiency in breaking down the complex of this gold-cyanide complex. This fails to fundamentally dismantle the gold-cyanide complex barrier, creating the industry pain point of "no gold extraction, no complete cyanide breaking down." Even with the addition of excessive oxidant, it is difficult to stably reduce the total cyanide concentration to within the limits stipulated in the "Emission Standard of Pollutants for Inorganic Chemical Industry" and the "Emission Standard of Water Pollutants for Gold Industry," leading to frequent exceedances of total cyanide in the effluent and failure to meet increasingly stringent environmental control requirements. Furthermore, the addition of excessive oxidant also generates toxic and harmful byproducts such as cyanogen chloride and chlorinated organic compounds, causing serious secondary pollution and further increasing environmental safety risks. Summary of the Invention

[0006] The purpose of this invention is to address the above-mentioned problems by providing a device and method for treating wastewater from potassium gold cyanide production.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a wastewater treatment device for potassium gold cyanide production, comprising a high-concentration wastewater treatment line, a low-concentration wastewater treatment line, and a PLC controller. The high-concentration wastewater treatment line includes a high-concentration wastewater pipeline, on which a high-concentration wastewater regulating tank and a first filtration pretreatment component are sequentially installed. The low-concentration wastewater treatment line includes a low-concentration wastewater pipeline, on which a low-concentration wastewater regulating tank and a second filtration pretreatment component are sequentially installed. The high-concentration wastewater pipeline is also connected to an electrolytic gold extraction component located behind the first filtration pretreatment component. The rear ends of the high-concentration wastewater pipeline and the low-concentration wastewater pipeline are connected to the same resin adsorption component, and the rear end of the resin adsorption component is connected to an oxidation reaction tank.

[0008] In the above-mentioned wastewater treatment device for potassium gold cyanide production, both the first and second pre-treatment filtration components are two-stage filtration systems, including a 10μm bag filter and a 5μm security filter.

[0009] In the aforementioned wastewater treatment device for potassium gold cyanide production, the electrolytic gold extraction component includes an electrolytic cell connected to a high-concentration wastewater pipeline. A circulation pipe is connected to the outside of the electrolytic cell, and a circulation pump is installed on the circulation pipe. A gold concentration sensor is installed at the outlet of the circulation pump. A base plate is provided on one side of the electrolytic cell, and a screw lifting assembly is fixed to the upper side of the base plate. A lifting plate is fixed to the moving end of the screw lifting assembly, and a linear motor module is fixed to the lower end of the lifting plate. An end cap corresponding to the electrolytic cell is fixed to the moving end of the linear motor module. A titanium-based platinum-plated anode plate and a pure titanium cathode plate are symmetrically fixed to the lower end of the end cap. A scraping assembly corresponding to the pure titanium cathode plate is also fixed to the upper end of the base plate.

[0010] In the aforementioned wastewater treatment device for potassium gold cyanide production, the scraping assembly includes an electric lifting rod fixed to a base plate. A connecting plate is fixedly connected to the top moving end of the electric lifting rod. An operating frame is fixed to one side of the connecting plate. Multiple pneumatic telescopic rods are uniformly inserted into the upper side wall of the operating frame. The moving ends of the multiple pneumatic telescopic rods on the same side are fixed with the same scraper plate located inside the operating frame. The outer ends of the multiple pneumatic telescopic rods are fixedly connected to the same air supply frame. An air supply pipe is connected to the air supply frame. A buffer chamber is opened inside the operating frame. Multiple cleaning nozzles connected to the buffer chamber are fixedly connected to the inner wall of the air supply frame. A water supply pipe connected to the buffer chamber is fixed to the outer wall of the operating frame. A collection box is snapped onto the lower end of the operating frame via a snap-fit ​​assembly.

[0011] In the aforementioned wastewater treatment device for potassium gold cyanide production, the snap-fit ​​assembly includes an L-shaped snap-fit ​​plate. Multiple push-pull rods are fixedly connected to the upper side wall of the L-shaped snap-fit ​​plate. A recessed groove for moving the push-pull rods is provided inside the lower end of the operating frame. One end of each push-pull rod located within the recessed groove is fixed to the same push-pull block. Multiple return springs sleeved around the push-pull rods are fixed to the inner walls of the push-pull block and the recessed groove. The L-shaped snap-fit ​​plate is snapped onto the lower top of the collection box. Multiple locking rods are movably inserted into the horizontal portion of the L-shaped snap-fit ​​plate. Multiple locking grooves that match and engage with the locking rods are provided on the lower top of the collection box. The lower ends of the multiple locking rods are fixedly connected to the same pulling plate. Multiple locking springs sleeved around the locking rods are fixed between the pulling plate and the L-shaped snap-fit ​​plate.

[0012] In the above-mentioned wastewater treatment device for potassium gold cyanide production, the lower end of the operating frame is fixedly connected with multiple positioning pins, and the upper end of the collection box is provided with multiple positioning slots that match and plug into the positioning pins.

[0013] In the aforementioned wastewater treatment device for potassium gold cyanide production, the resin adsorption assembly includes a fixed frame. Multiple symmetrically arranged electric push rods are fixedly connected to the fixed frame. The moving ends of the multiple electric push rods on the same side are fixedly connected to the same sealing cover. Each sealing cover has a telescopic corrugated pipe fixedly connected to its side wall. The upper telescopic corrugated pipe is connected to a high-concentration wastewater pipe and a low-concentration wastewater pipe, while the lower telescopic corrugated pipe is connected to an oxidation reaction tank. A gold concentration sensor is installed on the lower telescopic corrugated pipe. A support frame is also fixed to the fixed frame. A support shaft is rotatably sleeved on the support frame. A rotary motor for driving the support shaft is fixed to the fixed frame. A rotating seat is fixed to the upper end of the support shaft. Rotating motors are fixed to opposite sides of the rotating seat. A mounting frame is fixed to the moving end of the rotating motor. A resin adsorption tank is fixed inside the mounting frame, and the resin adsorption tank is sealed and fixed between the two sealing covers.

[0014] A method for using a wastewater treatment device for potassium gold cyanide production includes the following steps: S1. Separate water intake and homogenization conditioning The PLC controller starts the entire treatment unit, sending the high-concentration cyanide-containing wastewater generated during the production of potassium gold cyanide into the high-concentration wastewater equalization tank through the high-concentration wastewater pipeline, and the low-concentration cyanide-containing wastewater into the low-concentration wastewater equalization tank through the low-concentration wastewater pipeline. The high-concentration and low-concentration wastewater are homogenized and equalized in terms of water quality and quantity, stabilizing the influent water quality and treatment load, and avoiding the impact of water quality fluctuations on the subsequent treatment system. S2. Staged filtration pretreatment After homogenization and conditioning, the high-concentration wastewater is sent to the first filter pretreatment module through the high-concentration wastewater pipeline, and the low-concentration wastewater after homogenization and conditioning is sent to the second filter pretreatment module through the low-concentration wastewater pipeline. The high-concentration and low-concentration wastewater are subjected to two-stage filtration pretreatment to remove large-particle crystals, suspended solids, colloidal impurities and fine gold powder from the wastewater, so as to avoid solid impurities from clogging and wearing down the subsequent treatment components and to ensure the stability of the device operation. S3. High-concentration wastewater electrolytic gold extraction and pre-cyanide removal The pretreated high-concentration wastewater is sent to the electrolytic gold extraction unit through the high-concentration wastewater pipeline. The PLC controller controls the electrolytic gold extraction unit to start operation. Through electrolysis, the dicyanohydrin(I) acid complex in the wastewater is reduced, and the elemental gold resources in the wastewater are efficiently recovered. At the same time, some free cyanide and weakly complexed cyanide in the wastewater are simultaneously degraded by electrolytic oxidation, completing the pre-cyanide removal treatment of high-concentration wastewater and significantly reducing the reagent consumption and process load of downstream wastewater treatment. S4. Dual-line wastewater confluence and deep gold removal The high-concentration wastewater after electrolytic gold extraction is combined with the low-concentration wastewater after pretreatment and sent together into the resin adsorption module. The resin adsorption module specifically adsorbs the residual dicyano(I) acid complex in the wastewater, deeply recovers the trace gold resources in the wastewater, completely breaks down the high-stability gold-cyanide complex barrier, and reduces the difficulty of subsequent cyanide detoxification treatment. S5. Oxidative Cyanide Removal and Terminal Treatment The wastewater after deep gold removal by the resin adsorption module is sent to the oxidation reaction tank. In the oxidation reaction tank, the cyanide is completely detoxified through the oxidation process, which degrades the residual free cyanide, weak complexed cyanide and other heavy metal pollutants in the wastewater. After the wastewater quality meets the corresponding discharge standards, it is either discharged at the terminal or reused in production.

[0015] Compared with existing technologies, the advantages of this invention are as follows: 1. By establishing separate high-concentration and low-concentration wastewater treatment lines, the wastewater from potassium gold cyanide production is treated in two separate lines, improving efficiency, saving costs, and avoiding problems such as precious metal loss, waste of reagents and energy, and equipment load imbalance caused by mixed treatment. Electrolytic gold extraction is used for high-concentration wastewater, while resin adsorption is used for low-concentration wastewater, precisely recovering gold resources, breaking down the highly stable gold-cyanide complexation barrier, and achieving more thorough staged cyanide detoxification. This not only strictly controls the risk of highly toxic HCN leakage and ensures safe disposal, but also ensures that the effluent consistently meets standards and reduces hazardous waste production.

[0016] 2. By using electrolytic gold extraction components, scraping components, and snap-fit ​​components, the electrolytic process can efficiently reduce and recover elemental gold from high-concentration potassium gold cyanide production wastewater. At the same time, electrolytic anodic oxidation can simultaneously destroy some free cyanide and weakly complexed cyanide, achieving in-situ pre-cyanosis, significantly reducing the downstream reagent load, and adapting to extreme water quality with high salinity and high complexation stability. This solves the problems of difficult complex breaking and high reagent consumption in conventional processes.

[0017] 3. The resin adsorption components can specifically adsorb highly stable [Au(CN)2]⁻ complexes in wastewater, efficiently recover trace gold resources, prevent the loss of precious metals, and desorb saturated resins can be recycled and reused, significantly reducing operating costs. At the same time, it breaks down the gold-cyanide complexation barrier, significantly reducing the consumption of reagents and the difficulty of subsequent cyanide detoxification. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a wastewater treatment device for potassium gold cyanide production provided by the present invention; Figure 2 This is a schematic diagram of the electrolytic gold extraction component of a wastewater treatment device for potassium gold cyanide production provided by the present invention. Figure 3 This is a schematic diagram of the scraping assembly of a wastewater treatment device for potassium gold cyanide production provided by the present invention. Figure 4 This is a schematic diagram of the snap-fit ​​assembly of a potassium gold cyanide production wastewater treatment device provided by the present invention; Figure 5 This is a right-side three-dimensional structural schematic diagram of the resin adsorption component of a potassium gold cyanide production wastewater treatment device provided by the present invention. Figure 6 This is a left-side three-dimensional structural schematic diagram of the resin adsorption component of a potassium cyanide production wastewater treatment device provided by the present invention.

[0019] In the diagram: 1 High-concentration wastewater pipeline, 2 High-concentration wastewater equalization tank, 3 Filter pretreatment component one, 4 Low-concentration wastewater pipeline, 5 Low-concentration wastewater equalization tank, 6 Filter pretreatment component two, 7 Electrolytic gold extraction component, 71 Electrolytic cell, 72 Circulation pipe, 73 Circulation pump, 74 Gold concentration sensor one, 75 Base plate, 76 Screw lifting component, 77 Lifting plate, 78 Linear motor module, 79 End cap, 710 Titanium-based platinum-plated anode plate, 711 Pure titanium cathode plate, 8 Resin adsorption component, 81 Fixing frame, 82 Electric push rod, 83 Sealing cover, 84 Telescopic corrugated pipe, 85 Gold concentration sensor two, 86 Support frame, 87 Support shaft, 88 Rotary motor, 89 Rotary... 810 Base, 811 Tilting Motor, 811 Mounting Frame, 812 Resin Adsorption Tank, 9 Oxidation Reaction Tank, 10 Scraper Assembly, 101 Electric Lifting Rod, 102 Connecting Plate, 103 Operating Frame, 104 Pneumatic Telescopic Rod, 105 Scraper Blade, 106 Air Supply Frame, 107 Air Supply Pipe, 108 Buffer Chamber, 109 Cleaning Spray Nozzle, 1010 Water Supply Pipe, 1011 Collection Box, 11 Snap-fit ​​Assembly, 111 L-shaped Snap-fit ​​Plate, 112 Push-pull Rod, 113 Insertion Slot, 114 Push-pull Block, 115 Return Spring, 116 Locking Rod, 117 Locking Slot, 118 Pulling Plate, 119 Locking Spring, 1110 Positioning Insert, 1111 Positioning Slot. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] like Figures 1-6As shown, a wastewater treatment device for potassium gold cyanide production includes a high-concentration wastewater treatment line, a low-concentration wastewater treatment line, and a PLC controller. The high-concentration wastewater treatment line includes a high-concentration wastewater pipeline 1, on which a high-concentration wastewater equalization tank 2 and a first filtration pretreatment component 3 are sequentially installed. The low-concentration wastewater treatment line includes a low-concentration wastewater pipeline 4, on which a low-concentration wastewater equalization tank 5 and a second filtration pretreatment component 6 are sequentially installed. Both the first filtration component 3 and the second filtration pretreatment component 6 are two-stage filtration systems, including a 10μm bag filter and a 5μm security filter.

[0022] The high-concentration wastewater pipeline 1 is also connected to an electrolytic gold extraction component 7 located behind the filter pretreatment component 3. The electrolytic gold extraction component 7 includes an electrolytic cell 71 connected to the high-concentration wastewater pipeline 1. A circulation pipe 72 is connected to the outside of the electrolytic cell 71. A circulation pump 73 is installed on the circulation pipe 72. A gold concentration sensor 74 is installed at the outlet of the circulation pump 73 corresponding to the circulation pipe 72. A base plate 75 is provided on one side of the electrolytic cell 71. A screw lifting component 76 is fixed on the upper side of the base plate 75. A lifting plate 77 is fixed at the moving end of the screw lifting component 76. A linear motor module 78 is fixed at the lower end of the lifting plate 77. An end cap 79 corresponding to the electrolytic cell 71 is fixed at the moving end of the linear motor module 78. A titanium-based platinum-plated anode plate 710 and a pure titanium cathode plate 711 are symmetrically fixed at the lower end of the end cap 79. A scraper component 10 corresponding to the pure titanium cathode plate 711 is also fixed at the upper end of the base plate 75.

[0023] The scraping assembly 10 includes an electric lifting rod 101 fixed to a base plate 75. A connecting plate 102 is fixedly connected to the top moving end of the electric lifting rod 101. An operating frame 103 is fixed to one side of the connecting plate 102. Multiple pneumatic telescopic rods 104 are uniformly inserted into the upper side wall of the operating frame 103. The moving ends of the multiple pneumatic telescopic rods 104 on the same side are fixed with the same scraping plate 105 disposed inside the operating frame 103. The outer ends of the multiple pneumatic telescopic rods 104 are fixedly connected to the same air supply frame 106. The air supply frame 106 is connected to... There is an air supply pipe 107, and a buffer chamber 108 is opened inside the operating frame 103. Multiple cleaning nozzles 109 connected to the buffer chamber 108 are fixedly connected to the inner wall of the air supply frame 106. A water supply pipe 1010 connected to the buffer chamber 108 is fixedly connected to the outer wall of the operating frame 103. A material collection box 1011 is snapped into the lower end of the operating frame 103 through a snap-fit ​​assembly 11. Multiple positioning pins 1110 are fixedly connected to the lower end of the operating frame 103. Multiple positioning slots 1111 that match and insert into the positioning pins 1110 are opened at the upper end of the material collection box 1011.

[0024] The snap-fit ​​assembly 11 includes an L-shaped snap-fit ​​plate 111. Multiple push-pull rods 112 are fixedly connected to the upper side wall of the L-shaped snap-fit ​​plate 111. A recessed slot 113 for moving the push-pull rods 112 is provided inside the lower end of the operating frame 103. One end of each push-pull rod 112 located within the recessed slot 113 is fixed to the same push-pull block 114. Multiple return springs 115, sleeved around the push-pull rods 112, are fixed to the inner walls of the push-pull block 114 and the recessed slot 113. The snap-fit ​​plate 111 is attached to the lower top of the collection box 1011. The horizontal part of the L-shaped snap-fit ​​plate 111 is movably fitted with multiple locking rods 116. The lower top of the collection box 1011 is provided with multiple locking grooves 117 that match and insert into the locking rods 116. The lower ends of the multiple locking rods 116 are fixedly connected to the same pull plate 118. Multiple locking springs 119 are fixed between the pull plate 118 and the L-shaped snap-fit ​​plate 111 and are sleeved on the locking rods 116.

[0025] The high-concentration wastewater pipeline 1 and the low-concentration wastewater pipeline 4 are connected at their rear ends to the same resin adsorption assembly 8. The rear end of the resin adsorption assembly 8 is connected to an oxidation reaction tank 9. The resin adsorption assembly 8 includes a fixing frame 81. Multiple electric push rods 82, arranged vertically, are symmetrically fixedly connected to the fixing frame 81. The moving ends of the multiple electric push rods 82 on the same side are fixedly connected to the same sealing cover 83. The side walls of the sealing cover 83 are all fixedly connected to telescopic corrugated pipes 84. The upper telescopic corrugated pipe 84 is connected to the high-concentration wastewater pipeline 1 and the low-concentration wastewater pipeline 4, and the lower telescopic corrugated pipe 84 is connected to the oxidation reaction tank 9. Pool 9 is connected, and a gold concentration sensor 85 is installed on the lower telescopic corrugated pipe 84. A support frame 86 is also fixed on the fixed frame 81. A support shaft 87 is rotatably sleeved on the support frame 86. A rotary motor 88 for driving the support shaft 87 is fixed on the fixed frame 81. A rotating seat 89 is fixed at the upper end of the support shaft 87. A flip motor 810 is fixed on both opposite sides of the rotating seat 89. A mounting frame 811 is fixed at the moving end of the flip motor 810. A resin adsorption tank 812 is fixed inside the mounting frame 811. The resin adsorption tank 812 is sealed and fixed between two sealing covers 83.

[0026] The operating principle of the present invention is described as follows: High-concentration wastewater and low-concentration wastewater generated in the production of potassium gold cyanide are treated separately through high-concentration wastewater treatment line and low-concentration wastewater treatment line. The high-concentration wastewater and low-concentration wastewater are sent to high-concentration wastewater equalization tank 2 and low-concentration wastewater equalization tank 5 through high-concentration wastewater pipeline 1 and low-concentration wastewater pipeline 4, respectively. The wastewater is treated to equalize the quantity and quality. After the equalization is completed, it is sent to filter pretreatment component 1 3 and filter pretreatment component 2 6. Filter pretreatment component 1 3 and filter pretreatment component 2 6 are both two-stage filters. First, large particles of crystals and suspended solids are removed by a 10μm bag filter, and then colloidal impurities and fine gold powder are intercepted by a 5μm security filter. The pretreated high-concentration wastewater is further fed into the electrolytic cell 71 in the electrolytic gold extraction component 7. The circulation pump 73 is turned on, and the circulation pump 73, together with the circulation pipe 72, makes the high-concentration wastewater circulate in the electrolytic cell 71 to ensure uniform mass transfer. The wastewater is electrolyzed through the titanium-based platinum-plated anode plate 710 and the pure titanium cathode plate 711. Gold exists as stable complex ions [Au(CN)2]⁻, and free CN⁻ coexists in large quantities. The pure titanium cathode plate 711 has uniform conductivity, is non-corrosive, and does not interfere with hydrogen evolution. The gold complex ions preferentially gain electrons for reduction. Gold is continuously deposited on the surface of the pure titanium cathode plate 711 in the form of a dense gold film and gold mud. No impurities are precipitated, and the purity is high. It can be directly remelted and reused. The gold concentration in the circulating wastewater is detected by the gold concentration sensor 74. When the gold content in the circulating wastewater is ≤10mg / L, the electrolysis is stopped, and the treated high-concentration wastewater is sent into the resin adsorption component 8. After the high-concentration wastewater entering the electrolytic cell 71 is discharged after electrolytic gold extraction, the PLC controller controls the screw lifting assembly 76 to move the end cover 79 upward, thereby moving the titanium-based platinum-plated anode plate 710 and the pure titanium cathode plate 711 out of the electrolytic cell 71. Then, the linear motor module 78 moves the titanium-based platinum-plated anode plate 710 and the pure titanium cathode plate 711 to the top of the scraping assembly 10. The electric lifting rod 101 pushes the operating frame 103 upward, and the collection box 1011 is fitted over the pure titanium cathode plate 711. The PLC controller then controls the charging... The air supply equipment supplies air into the air supply frame 106, and pushes the scraper 105 to move through multiple pneumatic telescopic rods 104, so that the scraper 105 contacts the outside of the pure titanium cathode plate 711. The PLC controller controls the external water pump to introduce clean water into the water supply pipe 1010, and delivers it evenly to multiple cleaning nozzles 109 through the buffer chamber 108. The cleaning nozzles 109 spray high-pressure water flow to act on the pure titanium cathode plate 711 and the scraper 105, helping to scrape off the gold mud attached to the surface of the pure titanium cathode plate 711. The scraped gold mud falls into the collection box 1011. The material collection box 1011 and the operating frame 103 are accurately connected via multiple positioning pins 1110 and positioning slots 1111. During assembly, the outer pull plate 118 and the L-shaped snap-fit ​​plate 111 are pulled out of obstruction of the material collection box 1011. After the material collection box 1011 is aligned and connected with the operating frame 103, the L-shaped snap-fit ​​plate 111 is moved to the top underside of the material collection box 1011, so that the material collection box 1011 is stably connected to the operating frame 103, and the return spring... Under the pull of 115 and push-pull rod 112, the L-shaped snap-fit ​​plate 111 is placed relatively stably. After the L-shaped snap-fit ​​plate 111 is supported on the lower side of the top of the collection box 1011, the locking rod 116 is aligned with the locking groove 117, and the locking spring 119 provides a pulling force to the pull plate 118, thereby ensuring that the locking rod 116 is stably snapped in the locking groove 117, further realizing the stable limiting of the L-shaped snap-fit ​​plate 111, enabling the quick disassembly and assembly of the collection box 1011, and facilitating the recycling and processing of gold mud. The pretreated low-concentration wastewater and the high-concentration effluent after electrolytic gold extraction continue to enter the resin adsorption assembly 8. The resin adsorption tank 812 uses a macroporous strong-base anion exchange resin with high selectivity for [Au(CN)₂]⁻. It specifically adsorbs gold cyanide complexes through ion exchange, and the gold concentration in the effluent passing through the resin adsorption tank 812 is monitored in real time by the gold concentration sensor 85. When the gold concentration is ≥0.1mg / L, the resin adsorption is determined to be saturated. At this time, the PLC controller first controls the resin adsorption assembly 8 to shut down, and controls the electric push rod 82 to drive the two sealing covers 83 to move in opposite directions. The sealing covers 83 disengage from the resin adsorption tank 812, releasing the seal. The PLC controller then controls the rotary motor 88 to drive the support shaft 87 and the rotating seat 89 to rotate, cleaning the other side for later use. The resin adsorption tank 812 is precisely rotated between the two sealing caps 83. The electric push rod 82 is started again, pushing the sealing caps 83 to fit the resin adsorption tank 812. With the help of the telescopic corrugated pipe 84, the sealing assembly is completed. The flip motor 810 flips the saturated resin adsorption tank 812 180 degrees and enters the regeneration station. The staff first uses pure water to backwash the resin bed in the resin adsorption tank 812 to remove residual impurities. Then, a mixed desorption solution of 2-3% thiourea + 0.5-1% NaOH is introduced and circulated for desorption for 3-5 hours to obtain a high-concentration desorption solution with a gold content ≥500mg / L. After desorption is completed, the resin is rinsed with pure water until neutral. The resin is then transformed with 4-5% NaOH solution. Finally, after rinsing with pure water, the resin restores its adsorption performance and is transferred back to the standby station for recycling. After the wastewater undergoes deep gold removal by the resin adsorption module 8, the highly stable gold-cyanide complex has been removed, leaving only free cyanide and weakly complexed cyanide. At this point, the wastewater is sent to the oxidation reaction tank 9, where a multi-stage oxidation process is used to completely detoxify the cyanide, remove residual cyanide and heavy metal pollutants, and after treatment to meet the standards, it can be subsequently discharged or reused.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wastewater treatment device for potassium gold cyanide production, comprising a high-concentration wastewater treatment line, a low-concentration wastewater treatment line, and a PLC controller, characterized in that, The high-concentration wastewater treatment line includes a high-concentration wastewater pipeline (1), on which a high-concentration wastewater regulating tank (2) and a first filter pretreatment component (3) are installed in sequence. The low-concentration wastewater treatment line includes a low-concentration wastewater pipeline (4), on which a low-concentration wastewater regulating tank (5) and a second filter pretreatment component (6) are installed in sequence. The high-concentration wastewater pipeline (1) is also connected to an electrolytic gold extraction component (7) located behind the first filter pretreatment component (3). The rear ends of the high-concentration wastewater pipeline (1) and the low-concentration wastewater pipeline (4) are connected to the same resin adsorption component (8), and the rear end of the resin adsorption component (8) is connected to an oxidation reaction tank (9).

2. The wastewater treatment device for potassium gold cyanide production according to claim 1, characterized in that, Both the filter pretreatment component one (3) and the filter pretreatment component two (6) are two-stage filters, including a 10μm bag filter and a 5μm security filter.

3. The wastewater treatment device for potassium gold cyanide production according to claim 1, characterized in that, The electrolytic gold extraction assembly (7) includes an electrolytic cell (71) connected to a high-concentration wastewater pipe (1), a circulation pipe (72) connected to the outside of the electrolytic cell (71), a circulation pump (73) installed on the circulation pipe (72), a gold concentration sensor (74) installed on the circulation pipe (72) corresponding to the outlet position of the circulation pump (73), a base plate (75) provided on one side of the electrolytic cell (71), and a screw lifting assembly (76) fixed on one side of the upper end of the base plate (75). The moving end of the screw lifting assembly (76) is fixed with a lifting plate (77), the lower end of the lifting plate (77) is fixed with a linear motor module (78), the moving end of the linear motor module (78) is fixed with an end cap (79) corresponding to the electrolytic cell (71), the lower end of the end cap (79) is symmetrically fixed with a titanium-based platinum-plated anode plate (710) and a pure titanium cathode plate (711), and the upper end of the base plate (75) is also fixed with a scraper assembly (10) corresponding to the pure titanium cathode plate (711).

4. The wastewater treatment device for potassium gold cyanide production according to claim 3, characterized in that, The scraping assembly (10) includes an electric lifting rod (101) fixed on a base plate (75). A connecting plate (102) is fixedly connected to the top moving end of the electric lifting rod (101). An operating frame (103) is fixed to one side of the connecting plate (102). Multiple pneumatic telescopic rods (104) are uniformly fixedly inserted into the upper side wall of the operating frame (103). The moving ends of the multiple pneumatic telescopic rods (104) on the same side are fixed with the same scraping plate (105) arranged inside the operating frame (103). The outer end of (104) is fixedly connected to the same air supply frame (106), the air supply frame (106) is connected to an air supply pipe (107), the operating frame (103) is provided with a buffer chamber (108), the inner wall of the air supply frame (106) is fixedly connected to a plurality of cleaning nozzles (109) connected to the buffer chamber (108), the outer wall of the operating frame (103) is fixedly connected to a water supply pipe (1010) connected to the buffer chamber (108), and the lower end of the operating frame (103) is snapped with a collection box (1011) by a snap-fit ​​assembly (11).

5. The wastewater treatment device for potassium gold cyanide production according to claim 4, characterized in that, The snap-fit ​​assembly (11) includes an L-shaped snap-fit ​​plate (111). Multiple push-pull rods (112) are fixedly connected to the upper side wall of the L-shaped snap-fit ​​plate (111). The lower end of the operating frame (103) has an internal slot (113) for moving the push-pull rods (112). One end of each push-pull rod (112) located within the slot (113) is fixed to the same push-pull block (114). Multiple return springs (115) sleeved around the push-pull rods (112) are fixed to the inner walls of the push-pull block (114) and the slot (113). The L-shaped snap-fit ​​plate (111) is attached to the lower top of the collection box (1011). The horizontal part of the L-shaped snap-fit ​​plate (111) is movably fitted with multiple locking rods (116). The lower top of the collection box (1011) is provided with multiple locking grooves (117) that match and insert into the locking rods (116). The lower ends of the multiple locking rods (116) are fixedly connected to the same pull plate (118). Multiple locking springs (119) are fixed between the pull plate (118) and the L-shaped snap-fit ​​plate (111) and are sleeved on the locking rods (116).

6. The wastewater treatment device for potassium gold cyanide production according to claim 5, characterized in that, The lower end of the operation frame (103) is fixedly connected to multiple positioning pins (1110), and the upper end of the collection box (1011) is provided with multiple positioning slots (1111) that match and plug into the positioning pins (1110).

7. The wastewater treatment device for potassium gold cyanide production according to claim 1, characterized in that, The resin adsorption assembly (8) includes a fixed frame (81), on which multiple electric push rods (82) are symmetrically fixedly connected. The moving ends of the multiple electric push rods (82) on the same side are fixedly connected to the same sealing cover (83). The side walls of the sealing cover (83) are all fixedly connected to telescopic corrugated pipes (84). The upper telescopic corrugated pipe (84) is connected to the high-concentration wastewater pipe (1) and the low-concentration wastewater pipe (4). The lower telescopic corrugated pipe (84) is connected to the oxidation reaction tank (9). A gold concentration sensor II (85) is installed on the lower telescopic corrugated pipe (84). The fixed frame (81) is also fixed with a support frame (86), and a support shaft (87) is rotatably sleeved on the support frame (86). The fixed frame (81) is fixed with a rotary motor (88) for driving the support shaft (87) to rotate. The upper end of the support shaft (87) is fixed with a rotating seat (89). The opposite sides of the rotating seat (89) are fixed with a flip motor (810). The moving end of the flip motor (810) is fixed with a mounting frame (811). The mounting frame (811) is fixed with a resin adsorption tank (812). The resin adsorption tank (812) is sealed and fixed between two sealing caps (83).

8. A method of using a potassium gold cyanide production wastewater treatment device, comprising using the potassium gold cyanide production wastewater treatment device as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Separate water intake and homogenization conditioning The PLC controller starts the entire treatment unit, sending the high-concentration cyanide-containing wastewater generated during the production of potassium gold cyanide into the high-concentration wastewater equalization tank (2) through the high-concentration wastewater pipeline (1), and the low-concentration cyanide-containing wastewater into the low-concentration wastewater equalization tank (5) through the low-concentration wastewater pipeline (4). The high-concentration and low-concentration wastewater are homogenized and equalized in terms of water quality and quantity, respectively, to stabilize the influent water quality and treatment load, and to avoid water quality fluctuations from impacting the subsequent treatment system. S2. Staged filtration pretreatment After homogenization and adjustment, the high-concentration wastewater is sent to the first filter pretreatment component (3) through the high-concentration wastewater pipeline (1), and the low-concentration wastewater after homogenization and adjustment is sent to the second filter pretreatment component (6) through the low-concentration wastewater pipeline (4). The high-concentration and low-concentration wastewater are subjected to two-stage filtration pretreatment to remove large-particle crystals, suspended solids, colloidal impurities and fine gold powder in the wastewater, so as to avoid solid impurities from causing blockage and wear to the subsequent treatment components and to ensure the stability of the device operation. S3. High-concentration wastewater electrolytic gold extraction and pre-cyanide removal The pretreated high-concentration wastewater is sent to the electrolytic gold extraction unit (7) through the high-concentration wastewater pipeline (1). The PLC controller controls the electrolytic gold extraction unit (7) to start operation. The dicyanohydrin (I) acid complex in the wastewater is reduced by electrolysis, and the elemental gold resources in the wastewater are efficiently recovered. At the same time, some free cyanide and weakly complexed cyanide in the wastewater are simultaneously degraded by electrolytic oxidation, thus completing the pre-cyanide removal treatment of high-concentration wastewater and greatly reducing the reagent consumption and process load of downstream wastewater treatment. S4. Dual-line wastewater confluence and deep gold removal The high-concentration wastewater after electrolytic gold extraction is combined with the low-concentration wastewater after pretreatment and sent to the resin adsorption module (8). The resin adsorption module (8) specifically adsorbs the residual dicyanohydrin (I) acid complex in the wastewater, deeply recovers the trace gold resources in the wastewater, completely breaks down the high-stability gold-cyanide complex barrier, and reduces the difficulty of subsequent cyanide detoxification treatment. S5. Oxidative Cyanide Removal and Terminal Treatment The wastewater after deep gold removal by the resin adsorption component (8) is sent to the oxidation reaction tank (9). The oxidation process in the oxidation reaction tank (9) completes the thorough cyanide detoxification treatment, degrading the residual free cyanide, weak complexed cyanide and other heavy metal pollutants in the wastewater. After the wastewater quality meets the corresponding discharge standards, it is discharged at the terminal or reused in production.

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