Device for recovering precious metal from refining wastewater

Abstract

The invention relates to the technical field of wastewater treatment, and discloses a device for recovering precious metal from refining wastewater, the device comprises a device box body, anode adsorption plates and cathode desorption plates are arranged in the device box body in a staggered manner, and cathode desorption plate conductive strips are arranged at the tops of the cathode desorption plates; according to the device, precious metal ions are adsorbed through activated carbon fibers, migration of the precious metal ions is promoted through an external electric field, the efficient adsorption and desorption process of the metal ions is achieved, the adsorption efficiency of the precious metal ions is improved, and the adsorption efficiency of the precious metal ions is improved. Precious metals such as gold, silver, copper, platinum and palladium can be effectively recovered, the specific surface area of the used activated carbon fibers is large, the adsorption capacity and the adsorption rate are far higher than those of traditional granular activated carbon, a large number of precious metal ions can be adsorbed within a short time through optimized adsorption materials and devices, and the recovery efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a device for recovering precious metals from refined wastewater. Background Art

[0002] During the precious metal smelting process, the precious metal workshop will produce waste liquid containing precious metals (such as gold, silver, copper, platinum, palladium, etc.). If these waste liquids are not treated, they may lead to the loss of precious metals, resulting in a waste of resources. Therefore, how to effectively recover these precious metals, improve the recovery rate, and reduce environmental pollution is an important issue in the metallurgical industry.

[0003] At present, the recovery methods of precious metal wastewater mainly rely on traditional treatment methods such as metal replacement and chemical precipitation, but these methods are often difficult to achieve efficient recovery, especially when treating wastewater with low precious metal content. Common wastewater treatment technologies such as sedimentation, filter element adsorption, membrane separation, etc., also have problems such as limited treatment capacity, low recovery efficiency, and high operating costs. Therefore, a new recovery technology is urgently needed to improve the recovery efficiency and economic benefits of precious metals. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a device for recovering precious metals from refining wastewater.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A device for recovering precious metals from refining wastewater comprises a device box, wherein anode adsorption plates and cathode desorption plates are alternately arranged inside the device box, cathode desorption plate conductive strips are arranged on the top of the cathode desorption plate, anode adsorption plate conductive strips are arranged on the top of the anode adsorption plate, anode conductive strips and cathode conductive strips are arranged on both sides of the top of the device box, the cathode desorption plate conductive strips are electrically connected to the cathode conductive strips, and the anode adsorption plate conductive strips are electrically connected to the anode conductive strips; and a rectifier power supply is also included.

[0006] Preferably, the cathode conductive strip is connected to the negative electrode of the rectifier power supply through a cathode conductive wire.

[0007] Preferably, the anode conductive strip is connected to the positive electrode of the rectifier power supply through an anode conductive wire.

[0008] Preferably, a circulating water inlet and a circulating water outlet are respectively provided at both ends of the device box.

[0009] Preferably, the opening positions of the circulating water inlet and the circulating water outlet correspond to the side positions of the cathode desorption plate.

[0010] Preferably, both ends of the anode conductive strip and the cathode conductive strip are provided with extended connection screw holes.

[0011] Preferably, the cathode desorption plate conductive strips, the anode adsorption plate conductive strips and the cathode desorption plate are all made of titanium material.

[0012] Preferably, the anode adsorption plate is a mesh structure made of titanium material, the interior of the anode adsorption plate is filled with activated carbon fibers, and plastic rivets are arranged at intervals on both sides of the anode adsorption plate.

[0013] Preferably, the titanium material is a pure titanium plate.

[0014] Preferably, the titanium material is a titanium alloy plate.

[0015] Preferably, when a plurality of device boxes are connected end to end to form an assembly, the adjacent circulating water inlet and circulating water outlet at one end of the assembly are connected via a connecting pipe.

[0016] The precious metal recovery device for refining wastewater provided by the present invention effectively solves the problems of low efficiency and serious waste of resources of traditional recovery technology by combining activated carbon fiber adsorption with electrochemical ion migration desorption and desorption. Specifically, it has the following beneficial effects: 1. Efficient recovery of precious metals: The device adsorbs precious metal ions through activated carbon fibers and uses an external electric field to promote the migration of precious metal ions, achieving efficient metal ion adsorption and desorption processes, and can effectively recover precious metals such as gold, silver, copper, platinum, and palladium.

[0017] 2. Adsorption materials with high specific surface area: The activated carbon fiber used has a large specific surface area, and its adsorption capacity and adsorption rate are much higher than those of traditional granular activated carbon. Through optimized adsorption materials, the device can adsorb a large amount of precious metal ions in a relatively short time, greatly improving the recovery efficiency.

[0018] 3. Reduce operating costs: Due to the high adsorption efficiency and long service life of activated carbon fiber, the frequency of replacing adsorption materials is reduced, thereby reducing the operation and maintenance costs of the equipment.

[0019] 4. Modular design: The device adopts modular design, and can flexibly combine multiple sets of devices for series operation according to the different wastewater treatment volumes to meet wastewater treatment needs of different scales.

[0020] 5. Green and environmentally friendly: The precious metal ions in the wastewater can be efficiently recovered, which not only reduces the pollution to the environment, but also realizes the secondary utilization of precious metals, which meets the requirements of environmental protection and resource recycling.

[0021] 6. High degree of automation: The device provides power through a rectifier power supply and automatically controls the electrochemical reaction process. It is easy to operate and runs stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a device box for recovering precious metals from refining wastewater proposed in an embodiment of the present invention; Figure 2 A schematic diagram of the internal structure of a device for recovering precious metals from refining wastewater proposed in an embodiment of the present invention; Figure 3 A schematic diagram of the top view of a device for recovering precious metals from refining wastewater proposed in an embodiment of the present invention; Figure 4 A schematic diagram of the structure of a cathode desorption plate in a device for recovering precious metals from refining wastewater proposed in an embodiment of the present invention; Figure 5 A schematic diagram of the side structure of a cathode desorption plate in a device for recovering precious metals from refining wastewater proposed in an embodiment of the present invention; Figure 6 A schematic diagram of the structure of an anode adsorption plate in a device for recovering precious metals from refining wastewater proposed in an embodiment of the present invention; Figure 7 A schematic diagram of the side structure of an anode adsorption plate in a device for recovering precious metals from refining wastewater proposed in an embodiment of the present invention; Figure 8 This is a schematic diagram of six sets of connection structures of a device for recovering precious metals from refining wastewater proposed in an embodiment of the present invention.

[0023] In the figure: 1-device box, 2-cathode desorption plate conductive strip, 3-anode adsorption plate conductive strip, 4-anode conductive strip, 5-cathode conductive strip, 6-anode adsorption plate, 7-cathode desorption plate, 8-circulation water inlet, 9-anode conductive wire, 10-cathode conductive wire, 11-rectifier power supply, 12-circulation water outlet, 13-extension connection screw hole, 14-plastic rivet, 15-connecting pipe, 16-activated carbon fiber. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] In one embodiment, referring to Figures 1 to 8A device for recovering precious metals from refining wastewater comprises a device box 1, wherein anode adsorption plates 6 and cathode desorption plates 7 are alternately arranged inside the device box 1, cathode desorption plate conductive strips 2 are arranged on the top of the cathode desorption plate 7, anode adsorption plate conductive strips 3 are arranged on the top of the anode adsorption plate 6, anode conductive strips 4 and cathode conductive strips 5 are arranged on both sides of the top of the device box 1, the cathode desorption plate conductive strips 2 and the cathode conductive strips 5 are electrically connected, and the anode adsorption plate conductive strips 3 and the anode conductive strips 4 are electrically connected; and a rectifier power supply 11 is also included.

[0026] As a preferred embodiment of the present invention, the cathode conductive strip 5 is connected to the negative electrode of the rectifier power supply 11 through the cathode conductive wire 10 .

[0027] As a preferred embodiment of the present invention, the anode conductive strip 4 is connected to the positive electrode of the rectifier power supply 11 through the anode conductive wire 9 .

[0028] As a preferred embodiment of the present invention, a circulating water inlet 8 and a circulating water outlet 12 are respectively provided at both ends of the device housing 1 .

[0029] As a preferred embodiment of the present invention, the opening positions of the circulating water inlet 8 and the circulating water outlet 12 correspond to the side positions of the cathode desorption plate 7 .

[0030] As a preferred embodiment of the present invention, both ends of the anode conductive strip 4 and the cathode conductive strip 5 are provided with extended connection screw holes 13 .

[0031] As a preferred embodiment of the present invention, the cathode desorption plate conductive strip 2, the anode adsorption plate conductive strip 3 and the cathode desorption plate 7 are all made of titanium material.

[0032] As a preferred embodiment of the present invention, the titanium material is a pure titanium plate.

[0033] As a preferred embodiment of the present invention, the titanium material is a titanium alloy plate.

[0034] As a preferred embodiment of the present invention, the anode adsorption plate 6 is a mesh structure made of titanium material, the interior of the anode adsorption plate 6 is filled with activated carbon fibers 16, and plastic rivets 14 are arranged at intervals on both sides of the anode adsorption plate 6.

[0035] As a preferred embodiment of the present invention, when a plurality of device boxes 1 are connected end to end to form an assembly, the adjacent circulating water inlet 8 and circulating water outlet 12 at one end of the assembly are connected via a connecting pipe 15 .

[0036] The present invention adopts the technology of activated carbon fiber adsorption and ion migration desorption, aiming to recover precious metals in refined wastewater. Precious metals remain stable in an acidic environment, but simple adsorption methods often fail to achieve efficient separation. Therefore, the device activates metal ions in wastewater through an external electric field, thereby improving adsorption efficiency. Metal ions have specific redox potentials. Under the action of the electric field, anode and cathode reactions occur, promoting the extraction and separation of precious metals.

[0037] 1. Electrochemical reaction process Cathode reaction: A reduction reaction (electron acquisition process) occurs at the cathode. As the applied voltage gradually increases, the cathode potential decreases from high to low, and the noble metal ions are deposited in the order of their deposition potentials.

[0038] Anode reaction: Oxidation reaction (electron loss process) occurs at the anode. As the applied voltage increases, the anode potential increases from low to high, and metal ions are precipitated in the order of precipitation potential. The electric field causes different metal ions in the wastewater to migrate in different orders, thereby achieving the separation of precious metals.

[0039] 2. Adsorption material: activated carbon fiber with high iodine value The anode adsorption material uses activated carbon fiber with a high iodine value, which is crucial to the investment and operating costs of the treatment device. The activated carbon fiber is required to have a large specific surface area (usually greater than 2000 m² / g), high porosity and uniform pore size to ensure that the residual amount after ion migration and desorption is minimized.

[0040] Comparison between granular activated carbon and activated carbon fiber: The specific surface area of ​​granular activated carbon is generally between 7001000 m² / g, the pore size is uneven, the pore channels are long, and there are a variety of different pore sizes (such as small pores of 0.0010.01 μm and large pores of 0.5~5 μm).

[0041] The specific surface area of ​​activated carbon fiber is large, which can reach 1000~2500 m² / g, and its pores are extremely short and uniform in pore size (most of which are small pores of 0.002 μm), so it has a larger effective specific surface area. Compared with granular activated carbon, the pores of activated carbon fiber have higher adsorption efficiency and faster adsorption rate.

[0042] Adsorption performance: According to Langmuir adsorption theory, the adsorption capacity of an adsorbent is proportional to its specific surface area. Literature shows that the adsorption capacity of activated carbon fiber is 140 times that of granular activated carbon, and the adsorption rate is 10100 times that of granular activated carbon. Due to its short pores, activated carbon fiber has a large adsorption capacity, high adsorption and desorption rates, and a long service life. Engineering practice shows that the adsorption efficiency of activated carbon fiber can reach 92%~98%, which is much higher than that of ordinary granular activated carbon, and the average annual investment in equipment is greatly reduced.

[0043] 3. Electrode materials and electrochemical reactions The electrode material in the device is an activated carbon fiber and titanium mesh composite anode, and a titanium plate is used as a cathode. The conductivity of activated carbon fiber is between 0.7 and 0.85, and the resistance is generally between 0.1 and 0.5 Ω·cm. It can be used as both an adsorption material and an electrode material, which enhances the overall efficiency of the device.

[0044] Anodic dissolution reaction: At the anode, noble metal ions dissolve and convert into metal cations.

[0045] Cathodic reduction reaction: At the cathode, the noble metal ions are reduced to metal and deposited.

[0046] In the wastewater treatment process, the precious metals are first adsorbed by the activated carbon fibers on the anode adsorption plate, and then the precious metal ions are transferred to the cathode desorption plate through electrochemical reaction to complete the recovery of the precious metals. The wastewater circulates continuously in the device, and after multiple adsorption and desorption, the concentration of precious metals gradually decreases.

[0047] 4. Precious metal recovery When the precious metal content in the wastewater reaches a certain level, the precious metal ions on the anode adsorption plate migrate to the cathode desorption plate through electrochemical reaction. The precious metals on the cathode desorption plate are reduced to a metallic state and deposited after a certain period of time. For further recovery, the precious metals on the desorption plate can be soaked in aqua regia and other solutions to extract and recover the precious metals.

[0048] The workflow principle of the present invention comprises the following steps: S1. Wastewater input: Wastewater containing precious metals is pumped into the circulating water inlet of the device and flows into the device box. Inside the box, the wastewater flows through the staggered anode adsorption plates and cathode desorption plates.

[0049] S2. Precious metal adsorption: The surface of the anode adsorption plate is filled with activated carbon fibers, which can efficiently adsorb precious metal ions in wastewater. The precious metal ions in the wastewater interact with the active sites on the surface of the activated carbon fibers, thereby achieving the adsorption of precious metals.

[0050] S3. Electrochemical reaction: When the device starts working, the external electric field provides current through the rectifier power supply to form a potential difference. The precious metal ions undergo electron migration under the action of the electric field, and the precious metal ions on the anode adsorption plate migrate to the cathode desorption plate. On the cathode, the precious metal ions are reduced to metal and deposited on the surface of the cathode desorption plate.

[0051] S4. Desorption and recovery of precious metals: The precious metal ions on the cathode desorption plate are desorbed and deposited as metals within a certain period of time. The cathode desorption plate after desorption can be cleaned regularly and precious metals can be recovered through solutions such as aqua regia.

[0052] S5. Wastewater return: The wastewater treated by adsorption and desorption is sent back to the device box for multiple cycles of treatment. The precious metal content in the wastewater gradually decreases during the treatment process until the concentration of precious metals drops to an acceptable range before being discharged or sent to the sewage treatment system.

[0053] For the case of large wastewater treatment volume, the present invention designs a modular treatment method, and the specific process is as follows: Multiple devices in series: Multiple device boxes can be connected to each other through connecting pipes and conductive strips to form a series treatment system. Each device box is connected to other devices through the circulating water inlet and outlet to form a closed-loop system.

[0054] Parallel operation: After each device box is connected in series, it can independently treat wastewater. After the wastewater in the system undergoes multi-stage treatment, it can ensure the maximum efficiency of precious metal recovery at each stage.

[0055] Flexible adjustment: According to the wastewater flow and precious metal content, the number of device boxes can be flexibly increased or decreased to meet the treatment needs of different scales. During the treatment process, the precious metal recovery effect is positively correlated with the number of devices.

[0056] Improve recovery rate: By connecting multiple sets of equipment in series, wastewater is continuously recycled and treated at multiple stages, effectively improving the recovery rate of precious metals, ensuring that the concentration of precious metals in the wastewater is gradually reduced, and maximizing the recovery of precious metals.

[0057] Testing and Discharge: The treated wastewater will be tested at the end to ensure that the precious metal content is below a certain standard before being discharged into the sewage treatment system to meet environmental discharge requirements.

[0058] Through modular processing, the device can efficiently and flexibly treat a large amount of precious metal-containing wastewater, meeting the wastewater treatment needs of precious metal smelting workshops of different sizes and types.

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for recovering precious metals from refining wastewater, comprising a device housing (1), characterized in that: Anode adsorption plates (6) and cathode desorption plates (7) are arranged alternately inside the device box (1); cathode desorption plate conductive strips (2) are arranged on the top of the cathode desorption plate (7); anode adsorption plate conductive strips (3) are arranged on the top of the anode adsorption plate (6); anode conductive strips (4) and cathode conductive strips (5) are arranged on both sides of the top of the device box (1); the cathode desorption plate conductive strips (2) and the cathode conductive strips (5) are electrically connected; and the anode adsorption plate conductive strips (3) and the anode conductive strips (4) are electrically connected; It also includes a rectifier power supply (11).

2. The device for recovering precious metals from refining wastewater according to claim 1, characterized in that: The cathode conductive strip (5) is connected to the negative electrode of a rectifier power source (11) via a cathode conductive wire (10).

3. The device for recovering precious metals from refining wastewater according to claim 1, characterized in that: The anode conductive strip (4) is connected to the positive electrode of a rectifier power source (11) via an anode conductive wire (9).

4. The device for recovering precious metals from refining wastewater according to claim 1, characterized in that: A circulating water inlet (8) and a circulating water outlet (12) are respectively provided at both ends of the device box (1).

5. The device for recovering precious metals from refining wastewater according to claim 4, characterized in that: The opening positions of the circulating water inlet (8) and the circulating water outlet (12) correspond to the side positions of the cathode desorption plate (7).

6. The device for recovering precious metals from refining wastewater according to claim 1, characterized in that: Both ends of the anode conductive strip (4) and the cathode conductive strip (5) are provided with extended connection screw holes (13).

7. The device for recovering precious metals from refining wastewater according to claim 1, characterized in that: The cathode desorption plate conductive strip (2), the anode adsorption plate conductive strip (3) and the cathode desorption plate (7) are all made of titanium material.

8. The device for recovering precious metals from refining wastewater according to claim 1, characterized in that: The anode adsorption plate (6) is a mesh structure made of titanium material, the interior of the anode adsorption plate (6) is filled with activated carbon fibers (16), and plastic rivets (14) are arranged at intervals on both sides of the anode adsorption plate (6).

9. The device for recovering precious metals from refining wastewater according to claim 4, characterized in that: When a plurality of device boxes (1) are connected end to end to form an assembly, the adjacent circulating water inlet (8) and circulating water outlet (12) at one end of the assembly are connected via a connecting pipe (15).

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