Method for efficiently electrolyzing and recycling metal gold in waste gold plating solution containing gold cyanide

Abstract

The invention relates to a method for efficiently electrolyzing and recycling metal gold in a gold cyanide-containing waste gold plating solution, which comprises the following steps: a primary high-current low-density cathode electrolysis program: providing a 190-195 A / m < 2 > electrolysis environment, and driving a cathode module corresponding to primary high-current electrolysis to descend to a cathode region for electrolysis operation; a secondary low-current high-density cathode electrolysis formula: providing a 120-135A / m < 2 > electrolysis environment, and driving a secondary low-current multi-pole cathode module to descend to a cathode region for electrolysis operation h; a 150-160 A / m < 2 > electrolysis environment is provided, primary high-current electrolysis corresponds to a cathode module, and a secondary low-current multi-pole cathode module is driven to descend to a cathode area for electrolysis operation; a 190-195 A / m < 2 > electrolysis environment is provided, primary high-current electrolysis corresponds to a cathode module, secondary low-current multi-pole cathode modules are driven to descend to a cathode area for electrolysis operation, metal gold scraping is carried out, and the metal gold formula in the gold cyanide-containing waste gold plating liquid is recycled through electrolysis.

Description

Technical Field

[0001] The invention relates to an environmental protection technology and equipment for using the same, and in particular to a method for efficiently electrolyzing and recovering metallic gold from waste gold plating liquid containing gold cyanide. Background Art

[0002] Gold-containing waste liquid is generated during the industrial use and recycling of gold, and the gold content is mostly low, even in trace amounts. Therefore, their recycling is technically difficult and economically uneconomical, and they were often discharged, abandoned or stored in piles in the early days. At present, gold is expensive and scarce, so it needs to be recycled, and often in order to meet environmental protection requirements, the waste liquid must be harmlessly treated.

[0003] Therefore, it is necessary to provide a method for efficiently electrolyzing and recovering metallic gold from waste gold plating solution containing gold cyanide to solve the above problems. Summary of the invention

[0004] The purpose of the invention is to provide a method for efficiently electrolyzing and recovering metallic gold from waste gold plating liquid containing gold cyanide.

[0005] The technical solution is as follows:

[0006] A method for efficiently electrolyzing and recovering metallic gold from waste gold plating solution containing gold cyanide, comprising the following steps:

[0007] 1) An electrolytic cell is provided, the electrolytic cell comprising an anode region and a cathode region separated by a diaphragm, a plurality of anodes are inserted in the anode region, and each anode is individually provided with a power-on controller; a cathode module corresponding to a primary high-current electrolysis and a secondary low-current multi-pole cathode module are provided above the cathode region, and the cathode module corresponding to the primary high-current electrolysis and the secondary low-current multi-pole cathode module are both connected to a lifting drive member;

[0008] 2) During electrolysis, a high current and low density cathode electrolysis procedure is first performed, followed by a secondary low current and high density cathode electrolysis procedure;

[0009] 2-1) One-time high current low density cathode electrolysis program: All anodes are powered on, thereby providing an electrolysis environment of 190-195A / m2. The cathode module corresponding to the one-time high current electrolysis is driven down to the cathode area to perform electrolysis, which lasts for 1-2 hours to achieve one-time electrolysis;

[0010] 2-2) Secondary low current high density cathode electrolysis program: Select one or two of the anodes to energize, thereby providing a 120-135A / m2 electrolysis environment, and the secondary low current multi-pole cathode module is driven to descend to the cathode area to perform electrolysis, which lasts for 1-1.5 hours to achieve secondary electrolysis;

[0011] 3) High-density cathode medium current tertiary electrolysis: select three or four anodes to energize, thereby providing a 150-160A / m2 electrolysis environment, the first high-current electrolysis corresponding cathode module, the second low-current multi-pole cathode module is driven down to the cathode area for electrolysis, the duration is 0.5-1h, and the tertiary electrolysis is realized;

[0012] 4) High-density cathode high-current four-time electrolysis: All anodes are energized to provide an electrolysis environment of 190-195A / m2. The cathode module corresponding to the first high-current electrolysis and the second low-current multi-pole cathode module are driven down to the cathode area for electrolysis, which lasts for 0.3-0.5h to achieve four-time electrolysis;

[0013] 5) Disassemble the cathode module corresponding to the next high current electrolysis and the secondary low current multi-pole cathode module, scrape off the metallic gold, and complete the electrolytic recovery of metallic gold from the waste gold plating solution containing gold cyanide.

[0014] Furthermore, the lifting drive member is composed of a cylinder or a hydraulic cylinder.

[0015] Furthermore, the anode is made of stainless steel.

[0016] Furthermore, the cathode module corresponding to the primary high current electrolysis and the secondary low current multi-pole cathode module are both made of carbon fiber material.

[0017] Furthermore, the cathode module corresponding to the primary high current electrolysis includes a first cathode plate body, and no more than 8 first cathode extensions are arranged below the first cathode plate body.

[0018] Furthermore, the number of the first cathode extensions is 4-6.

[0019] Furthermore, the secondary low-current multi-pole cathode module includes a second cathode plate body, and no less than 28 second cathode extensions are arranged below the second cathode plate body.

[0020] Furthermore, the number of the second cathode extensions is 30-32.

[0021] Furthermore, during electrolysis, an auxiliary agent is added, the auxiliary agent is sodium sulfate, and the addition amount is 2-4 g / l.

[0022] Compared with the prior art, the present invention can efficiently electrolyze and recover metallic gold from waste gold plating solution containing gold cyanide by using a low-density cathode machine with high current and a high-density cathode machine with medium and low current. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0024] Example:

[0025] See also Figure 1 This embodiment shows a method for efficiently electrolyzing and recovering metallic gold from waste gold plating solution containing gold cyanide, the steps comprising:

[0026] 1) An electrolytic cell is provided, the electrolytic cell comprising an anode region 2 and a cathode region 3 separated by a diaphragm 1, a plurality of anodes 4 are inserted in the anode region 2, and each anode 4 is individually provided with a power-on controller; a cathode module 5 corresponding to a primary high-current electrolysis and a secondary low-current multi-pole cathode module 6 are provided above the cathode region, and the cathode module 5 corresponding to the primary high-current electrolysis and the secondary low-current multi-pole cathode module 6 are both connected to a lifting drive 7;

[0027] 2) During electrolysis, a high current and low density cathode electrolysis procedure is first performed, followed by a secondary low current and high density cathode electrolysis procedure;

[0028] 2-1) One-time high current low density cathode electrolysis program: All anodes 4 are powered on, thereby providing an electrolysis environment of 190-195A / m2, and the cathode module 5 corresponding to the one-time high current electrolysis is driven to descend to the cathode area to perform electrolysis, which lasts for 1-2 hours to achieve one-time electrolysis;

[0029] 2-2) Secondary low current high density cathode electrolysis program: one or two of the anodes 4 are energized to provide an electrolysis environment of 120-135A / m2, and the secondary low current multi-pole cathode module 6 is driven to descend to the cathode area to perform electrolysis for a duration of 1-1.5 hours to achieve secondary electrolysis;

[0030] 3) High-density cathode medium current tertiary electrolysis: select three or four anodes 4 to energize, thereby providing an electrolysis environment of 150-160A / m2, the cathode module 5 corresponding to the primary high-current electrolysis, and the secondary low-current multi-pole cathode module 6 is driven down to the cathode area to perform electrolysis, which lasts for 0.5-1h, and realizes tertiary electrolysis;

[0031] 4) High-density cathode high-current four-time electrolysis: All anodes 4 are powered on, thereby providing an electrolysis environment of 190-195A / m2. The cathode module 5 corresponding to the first high-current electrolysis and the second low-current multi-pole cathode module 6 are driven down to the cathode area to perform electrolysis, which lasts for 0.3-0.5h, achieving four-time electrolysis;

[0032] 5) Disassemble the cathode module 5 corresponding to the first high current electrolysis and the second low current multi-pole cathode module 6, scrape off the metallic gold, and complete the electrolytic recovery of metallic gold in the waste gold plating solution containing gold cyanide.

[0033] in:

[0034] When the concentration is high, the primary electrolysis is carried out with high current and less cathode, and the concentration of metal gold is reduced.

[0035] Secondary electrolysis is to adapt to the low current medium density cathode and perform electrolysis again;

[0036] The purpose of tertiary electrolysis is to use medium current high density cathode method to carry out medium current cycle electrolysis with high density cathode;

[0037] The purpose of the four electrolysis steps is to provide a high current and high density cathode method to maximize the electrolytic recovery of residual metallic gold.

[0038] The lifting drive member 7 is composed of a cylinder or a hydraulic cylinder.

[0039] The anode 4 is made of stainless steel.

[0040] The cathode module 5 corresponding to the primary high current electrolysis and the secondary low current multi-pole cathode module 6 are both made of carbon fiber material.

[0041] The cathode module 5 corresponding to the primary high current electrolysis comprises a first cathode plate body 51 , and no more than eight first cathode extensions 53 are arranged below the first cathode plate body 52 .

[0042] The number of the first cathode extensions 52 is 4-6.

[0043] The secondary low-current multi-pole cathode module 6 comprises a second cathode plate body 61 , and no less than 28 second cathode extensions 62 are arranged below the second cathode plate body 61 .

[0044] The number of the second cathode extensions 62 is 30-32.

[0045] During electrolysis, an auxiliary agent is added, the auxiliary agent is sodium sulfate, and the addition amount is 2-4g / l.

[0046] Compared with the prior art, the present invention can efficiently electrolyze and recover metallic gold from waste gold plating solution containing gold cyanide by using a low-density cathode machine with high current and a high-density cathode machine with medium and low current.

[0047] For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and all of these belong to the protection scope of the present invention.

Claims

1. A method for efficiently electrolyzing and recovering metallic gold from waste gold plating solution containing gold cyanide, characterized in that: include: 1) An electrolytic cell is provided, the electrolytic cell comprising an anode region and a cathode region separated by a diaphragm, a plurality of anodes are inserted in the anode region, and each anode is individually provided with a power-on controller; a cathode module corresponding to a primary high-current electrolysis and a secondary low-current multi-pole cathode module are provided above the cathode region, and the cathode module corresponding to the primary high-current electrolysis and the secondary low-current multi-pole cathode module are both connected to a lifting drive member; 2) During electrolysis, a high current and low density cathode electrolysis procedure is first performed, followed by a secondary low current and high density cathode electrolysis procedure; 2-1) One-time high current low density cathode electrolysis program: All anodes are powered on, thereby providing an electrolysis environment of 190-195A / m2. The cathode module corresponding to the one-time high current electrolysis is driven down to the cathode area to perform electrolysis, which lasts for 1-2 hours to achieve one-time electrolysis; 2-2) Secondary low current high density cathode electrolysis program: Select one or two of the anodes to energize, thereby providing a 120-135A / m2 electrolysis environment, and the secondary low current multi-pole cathode module is driven to descend to the cathode area to perform electrolysis, which lasts for 1-1.5 hours to achieve secondary electrolysis; 3) High-density cathode medium current tertiary electrolysis: select three or four anodes to energize, thereby providing a 150-160A / m2 electrolysis environment, the first high-current electrolysis corresponding cathode module, the second low-current multi-pole cathode module is driven down to the cathode area for electrolysis, the duration is 0.5-1h, and the tertiary electrolysis is realized; 4) High-density cathode high-current four-time electrolysis: All anodes are energized to provide an electrolysis environment of 190-195A / m2. The cathode module corresponding to the first high-current electrolysis and the second low-current multi-pole cathode module are driven down to the cathode area for electrolysis, which lasts for 0.3-0.5h to achieve four-time electrolysis; 5) Disassemble the cathode module corresponding to the next high current electrolysis and the secondary low current multi-pole cathode module, scrape off the metallic gold, and complete the electrolytic recovery of metallic gold from the waste gold plating solution containing gold cyanide.

2. A method for efficiently electrolyzing and recovering metallic gold from waste gold plating solution containing gold cyanide according to claim 1, characterized in that: The lifting drive member is composed of a cylinder or a hydraulic cylinder.

3. A method for efficiently electrolyzing and recovering metallic gold from waste gold plating solution containing gold cyanide according to claim 2, characterized in that: The anode is made of stainless steel.

4. A method for efficiently electrolyzing and recovering metallic gold from waste gold plating solution containing gold cyanide according to claim 3, characterized in that: The cathode module corresponding to the primary high-current electrolysis and the secondary low-current multi-pole cathode module are both made of carbon fiber material.

5. A method for efficiently electrolyzing and recovering metallic gold from waste gold plating solution containing gold cyanide according to claim 4, characterized in that: The cathode module corresponding to the primary high current electrolysis comprises a first cathode plate body, and no more than 8 first cathode extensions are arranged below the first cathode plate body.

6. A method for efficiently electrolyzing and recovering metallic gold from waste gold plating solution containing gold cyanide according to claim 6, characterized in that: The number of the first cathode extensions is 4-6.

7. A method for efficiently electrolyzing and recovering metallic gold from waste gold plating solution containing gold cyanide according to claim 6, characterized in that: The secondary low-current multi-pole cathode module comprises a second cathode plate body, and no less than 28 second cathode extensions are arranged below the second cathode plate body.

8. A method for efficiently electrolyzing and recovering metallic gold from waste gold plating solution containing gold cyanide according to claim 7, characterized in that: The number of the second cathode extensions is 30-32.

9. A method for efficiently electrolyzing and recovering metallic gold from waste gold plating solution containing gold cyanide according to claim 8, characterized in that: During electrolysis, an auxiliary agent is added, the auxiliary agent is sodium sulfate, and the addition amount is 2-4g / l.

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