Gold extraction method and device based on pulse electrolysis to strengthen gold cyanide complex dissociation
By combining pulsed electrolysis with glucose pretreatment, the gold-cyanide complex was destroyed, improving the gold extraction efficiency and reducing environmental pollution, thus solving the problem of low gold extraction efficiency in alkaline solutions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SUZHOU WUZHONG SOLID WASTE TREATMENT CO LTD
- Filing Date
- 2026-03-19
- Publication Date
- 2026-06-16
AI Technical Summary
In alkaline cyanide-containing solutions, gold mainly exists in the form of stable anionic complexes, resulting in low gold extraction efficiency and difficulty in direct electrodeposition.
A pulse electrolysis-based method is adopted, which breaks down the gold-cyanide complex under high-voltage pulse current conditions and uses a copper alloy cathode mesh for electrolysis. The electrolysis voltage and frequency are adjusted cyclically, and combined with pretreatment with glucose reducing agent, an alkaline electrolysis environment is formed. The electrolysis is repeated multiple times to dissociate gold ions and oxidize cyanide ions into non-toxic or low-toxic substances.
It improves gold extraction efficiency, reduces environmental pollution, and achieves efficient gold recovery and harmless treatment of cyanide ions.
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Abstract
Description
Technical Field
[0001] This invention relates to environmental protection technology and equipment, specifically, to a method and apparatus for gold extraction based on pulse electrolysis-enhanced dissociation of gold-cyanide complexes. Background Technology
[0002] Cyanide extraction is a common method of gold refining. Gold undergoes a chemical reaction in a cyanide solution under the presence of oxygen to form a soluble gold-cyanide complex, thereby separating the gold from the gangue minerals.
[0003] However, in alkaline cyanide-containing solutions, gold mainly exists as stable anionic complexes. The presence of this form, with its extremely high stability constant, makes direct electrodeposition of gold difficult, resulting in low gold extraction efficiency.
[0004] Therefore, there is a need to provide a method and apparatus for gold extraction based on pulse electrolysis to enhance the dissociation of gold cyanide complexes in order to solve the above problems. Summary of the Invention
[0005] The purpose of this invention is to provide a method and apparatus for gold extraction based on pulse electrolysis to enhance the dissociation of gold cyanide complexes.
[0006] The present invention achieves the above objectives through the following technical solutions: Option 1: A method for gold extraction based on pulse electrolysis-enhanced gold cyanide complex dissociation is disclosed. The method uses a device for pulse electrolysis-enhanced gold cyanide complex dissociation, which includes a gold cyanide complex solution tank and several sets of anode modules corresponding to the gold cyanide complex solution tank. Each anode module includes an anode setting plate, which is liftable and has several anodes. The gold cyanide complex solution tank contains a copper alloy cathode mesh for use with the anode; The withdrawal process is as follows: 1) The gold cyanide complex solution is loaded into the gold cyanide complex solution tank and pretreated. Specifically, a reducing agent, glucose, is added to the gold cyanide complex solution tank. Then, the tank is stirred at 100 rpm for 2 minutes to consume the residual oxidant in the gold cyanide complex solution. The pH is then adjusted to 9-10 to form an alkaline electrolysis environment. 2) A copper alloy cathode mesh is loaded, which serves as the cathode and is used in conjunction with electrolysis. 3) One of several anode modules descends, and the anode is immersed in the gold cyanide complex solution in the gold cyanide complex solution tank; 4) Connect the anode to a high-voltage pulse power supply, adjust the electrolysis voltage to 3000V and the pulse frequency to 40Hz, and perform a primary electrolysis at the medium voltage defined in the primary electrolysis scheme for 5-6 minutes; 5) Adjust the electrolysis voltage to 6000V and the pulse frequency to 20Hz, and perform medium-voltage secondary electrolysis as defined in the secondary electrolysis scheme for 2-3 minutes; 6) Adjust the electrolysis voltage to 2000V and the pulse frequency to 60Hz, and perform the three-stage electrolysis scheme defined by the medium-voltage three-stage electrolysis for 1-5 minutes; 7) Repeat steps 4)-6) 3-4 times to complete the electrolysis; 8) Gold powder is obtained by scraping the cathode deposits on the copper alloy cathode grid and smelting them. The electrolyte can be further treated to meet discharge standards or be reused. 9) If the current anode module has been working for more than 10 hours, switch to another anode module and perform surface stripping on the anode of the anode module that has met the working time requirement.
[0007] Furthermore, the anode setting plate is connected to the lifting cylinder.
[0008] Furthermore, each anode setting plate is equipped with 6-10 anodes.
[0009] Furthermore, the number of anode modules is at least two.
[0010] Furthermore, the anode is made of Material composition.
[0011] Option two is: A device for enhancing the dissociation of gold cyanide complex based on pulse electrolysis includes a gold cyanide complex solution tank, and a number of anode modules are arranged corresponding to the gold cyanide complex solution tank. The anode modules include an anode setting plate, which is liftable and has a number of anodes. The gold cyanide complex solution tank contains a copper alloy cathode mesh used in conjunction with the anode.
[0012] Furthermore, the anode setting plate is connected to the lifting cylinder.
[0013] Furthermore, each anode setting plate is equipped with 6-10 anodes.
[0014] Furthermore, the number of anode modules is at least two.
[0015] Furthermore, the anode is made of Material composition.
[0016] Compared with existing technologies, this invention utilizes a high-voltage pulse method to efficiently destroy gold-cyanide complexes (such as gold-cyanide complexes) through electrochemical means under pulsed current conditions. This releases gold ions for recovery, while simultaneously releasing cyanide ions (…). It is oxidized into non-toxic or low-toxic substances, which effectively ensures the gold extraction efficiency and reduces environmental pollution. Attached Figure Description
[0017] Figure 1 This is one of the structural schematic diagrams of the present invention; Figure 2 This is the second structural schematic diagram of the present invention. Detailed Implementation
[0018] Example:
[0019] See Figure 1-2 This embodiment demonstrates a device for enhancing the dissociation of gold cyanide complex based on pulse electrolysis, including a gold cyanide complex solution tank 1, and a number of anode modules 2 are provided corresponding to the gold cyanide complex solution tank 1. The anode module 2 includes an anode setting plate 21, which is liftable and has a number of anodes 22. The gold cyanide complex solution tank 1 contains a copper alloy cathode mesh for use with the anode.
[0020] The anode setting plate 21 is connected to the lifting cylinder 3.
[0021] Each anode setting plate 21 has 6-10 anodes 22.
[0022] The number of anode modules 2 is at least two.
[0023] Anode 22 is made of Material composition.
[0024] The withdrawal process is as follows: 1) The gold cyanide complex solution is loaded into the gold cyanide complex solution tank and pretreated. Specifically, a reducing agent, glucose, is added to the gold cyanide complex solution tank 1. Then, the mixture is stirred at 100 rpm for 2 minutes to consume the residual oxidant in the gold cyanide complex solution. The pH is then adjusted to 9-10 to form an alkaline electrolysis environment. 2) A copper alloy cathode mesh is loaded, which serves as the cathode and is used in conjunction with electrolysis. 3) One of several sets of anode modules 2 descends, and anode 22 is immersed in the gold cyanide complex solution in the gold cyanide complex solution tank; 4) Connect anode 22 to a high-voltage pulse power supply, adjust the electrolysis voltage to 3000V and the pulse frequency to 40Hz, and perform a primary electrolysis at the medium voltage defined in the primary electrolysis scheme for 5-6 minutes. 5) Adjust the electrolysis voltage to 6000V and the pulse frequency to 20Hz, and perform medium-voltage secondary electrolysis as defined in the secondary electrolysis scheme for 2-3 minutes; 6) Adjust the electrolysis voltage to 2000V and the pulse frequency to 60Hz, and perform the three-stage electrolysis scheme defined by the medium-voltage three-stage electrolysis for 1-5 minutes; 7) Repeat steps 4)-6) 3-4 times to complete the electrolysis; 8) Gold powder is obtained by scraping the cathode deposits on the copper alloy cathode grid and smelting them. The electrolyte can be further treated to meet discharge standards or be reused. 9) If the current anode module 2 has been working for more than 10 hours, switch to another anode module 2 and perform surface defilming on the anode 22 of the anode module 2 that has been working for the required duration. The film here is the oxide film formed on the anode surface.
[0025] Compared with existing technologies, this invention utilizes a high-voltage pulse method to efficiently destroy gold-cyanide complexes (such as gold-cyanide complexes) through electrochemical means under pulsed current conditions. This releases gold ions for recovery, while simultaneously releasing cyanide ions (…). It is oxidized into non-toxic or low-toxic substances, which effectively ensures the gold extraction efficiency and reduces environmental pollution.
[0026] The above are merely some embodiments of the present invention. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of the present invention, and all such modifications and improvements fall within the scope of protection of the present invention.
Claims
1. A method for gold extraction based on pulse electrolysis-enhanced dissociation of gold-cyanide complexes, characterized in that: Pulse electrolytic gold extraction is performed using a device based on pulse electrolysis to enhance the dissociation of gold cyanide complexes. The device includes a gold cyanide complex solution tank and several sets of anode modules corresponding to the gold cyanide complex solution tank. The anode modules include an anode setting plate, which is liftable and has several anodes. The gold cyanide complex solution tank contains a copper alloy cathode mesh for use with the anode; The withdrawal process is as follows: 1) The gold cyanide complex solution is loaded into the gold cyanide complex solution tank and pretreated. Specifically, a reducing agent, glucose, is added to the gold cyanide complex solution tank. Then, the tank is stirred at 100 rpm for 2 minutes to consume the residual oxidant in the gold cyanide complex solution. The pH is then adjusted to 9-10 to form an alkaline electrolysis environment. 2) A copper alloy cathode mesh is loaded, which serves as the cathode and is used in conjunction with electrolysis. 3) One of several anode modules descends, and the anode is immersed in the gold cyanide complex solution in the gold cyanide complex solution tank; 4) Connect the anode to a high-voltage pulse power supply, adjust the electrolysis voltage to 3000V and the pulse frequency to 40Hz, and perform a primary electrolysis at the medium voltage defined in the primary electrolysis scheme for 5-6 minutes; 5) Adjust the electrolysis voltage to 6000V and the pulse frequency to 20Hz, and perform medium-voltage secondary electrolysis as defined in the secondary electrolysis scheme for 2-3 minutes; 6) Adjust the electrolysis voltage to 2000V and the pulse frequency to 60Hz, and perform the three-stage electrolysis scheme defined by the medium-voltage three-stage electrolysis for 1-5 minutes; 7) Repeat steps 4)-6) 3-4 times to complete the electrolysis; 8) Gold powder is obtained by scraping the cathode deposits on the copper alloy cathode grid and smelting them. The electrolyte can be further treated to meet discharge standards or be reused. 9) If the current anode module has been working for more than 10 hours, switch to another anode module and perform surface stripping on the anode of the anode module that has met the working time requirement.
2. The gold extraction method based on pulse electrolysis-enhanced gold-cyanide complex dissociation according to claim 1, characterized in that: The anode setting plate is connected to the lifting cylinder.
3. The gold extraction method based on pulse electrolysis-enhanced gold-cyanide complex dissociation according to claim 1, characterized in that: Each anode setting plate has 6-10 anodes.
4. The gold extraction method based on pulse electrolysis-enhanced gold-cyanide complex dissociation according to claim 1, characterized in that: The number of anode modules is at least two.
5. The gold extraction method based on pulse electrolysis-enhanced gold-cyanide complex dissociation according to claim 1, characterized in that: Anode is made of Material composition.
6. A device for enhancing the dissociation of gold cyanide complexes based on pulse electrolysis, characterized in that: It includes a gold cyanide complex solution tank, and a number of anode modules are provided corresponding to the gold cyanide complex solution tank. The anode modules include an anode setting plate, which is liftable and has a number of anodes. The gold cyanide complex solution tank contains a copper alloy cathode mesh used in conjunction with the anode.
7. The device for enhancing the dissociation of gold cyanide complexes based on pulse electrolysis according to claim 6, characterized in that: The anode setting plate is connected to the lifting cylinder.
8. The apparatus for enhancing the dissociation of gold cyanide complexes based on pulse electrolysis according to claim 6, characterized in that: Each anode setting plate has 6-10 anodes.
9. The device for enhancing the dissociation of gold cyanide complexes based on pulse electrolysis according to claim 6, characterized in that: The number of anode modules is at least two.
10. The device for enhancing the dissociation of gold cyanide complexes based on pulse electrolysis according to claim 6, characterized in that: Anode is made of Material composition.