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Mixed additive for electrolyzing acid etching waste liquid and method of preparing copper powder by using mixed additive

A technology of acidic etching waste liquid and mixed additives, which is applied in the electrolysis process, electrolysis components, electrodes, etc., can solve the problems of insufficient copper powder purity and copper recovery rate, high production cost, human body and environmental hazards, and reduce recycling The effect of copper extraction cost, stable product quality, and simple production process

Inactive Publication Date: 2017-08-18
SHANDONG JINBAO ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extraction method requires a large amount of organic solvent as the extraction agent, the production cost is high, and problems such as difficult stripping and two-phase entrainment are prone to occur in multiple cycles
Add iron powder, aluminum powder and glucose and other reducing agents to reduce the etching waste liquid, and copper powder can be prepared, but the purity and copper recovery rate of copper powder are not high enough.
Formaldehyde, hydrazine hydrate and other reducing agents are toxic substances, which are prone to poisoning hazards during operation, and should not be used
In the process of using the electrolytic method to recover copper, since the etching waste liquid contains a large amount of Cl - , while the anode surface Cl - The discharge order of - , so the gas precipitated on the surface of the anode in the electrolysis process is represented by Cl 2 Mainly, the precipitated Cl 2 Not only will it corrode the equipment, but it will also cause harm to the human body and the environment.
To avoid Cl 2 For precipitation, the electrolysis equipment needs to be modified, such as using ionic membranes to separate the etching solution, adding strong alkali equipment to recover chlorine gas, etc. No matter what kind of modification will increase the process flow and production investment

Method used

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  • Mixed additive for electrolyzing acid etching waste liquid and method of preparing copper powder by using mixed additive
  • Mixed additive for electrolyzing acid etching waste liquid and method of preparing copper powder by using mixed additive
  • Mixed additive for electrolyzing acid etching waste liquid and method of preparing copper powder by using mixed additive

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The mixed additive used for preparing copper powder from electrolytic acidic etching waste liquid contains the following components in the aqueous solution of every liter of mixed additive:

[0035]

[0036]

[0037] The method for preparing copper powder by using the above-mentioned mixed additive electrolysis acidic etching waste solution comprises the following steps:

[0038] 1) Microporous precision filtration is carried out to the etching waste liquid, and the copper ion concentration of the obtained solution is 120g / L;

[0039] 2) Dilute the filtered etching waste liquid, add water until the copper ion concentration is 30g / L, add 20ml / L of mixed additives, and make an electrolyte;

[0040] 3) The electrolyte is pumped into the electrolytic cell, and the titanium-based manganese dioxide electrode is used as the anode, and the stainless steel plate electrode is used as the cathode for direct electrolytic treatment. The temperature of the electrolyte is 20±2°C...

Embodiment 2

[0044] The mixed additive used for preparing copper powder from electrolytic acidic etching waste liquid contains the following components in the aqueous solution of every liter of mixed additive:

[0045]

[0046] The method for preparing copper powder by electrolyzing acidic etching waste liquid with above-mentioned mixed additives, the operation steps are:

[0047] 1) Microporous precision filtration is carried out to the etching waste liquid, and the copper ion concentration of the obtained solution is 150g / L;

[0048] 2) Dilute the filtered etching waste liquid, add water until the copper ion concentration is 50g / L, add 63ml / L of mixed additives, and make an electrolyte;

[0049] 3) Pump the electrolyte into the electrolytic cell, use the titanium-based iridium-tantalum coating electrode as the anode, and the stainless steel plate electrode as the cathode for direct electrolytic treatment. The temperature of the electrolyte is 30±2°C, and the current density is 1300A / m...

Embodiment 3

[0053]The mixed additive used for preparing copper powder from electrolytic acidic etching waste liquid contains the following components in the aqueous solution of every liter of mixed additive:

[0054]

[0055] The method for preparing copper powder by electrolyzing acidic etching waste liquid with above-mentioned mixed additives, the operation steps are:

[0056] 1) Microporous precision filtration is carried out to the etching waste liquid, and the copper ion concentration of the obtained solution is 180g / L;

[0057] 2) Dilute the filtered etching waste liquid, add water until the copper ion concentration is 45g / L, add 30ml / L of mixed additives, and make an electrolyte;

[0058] 3) The electrolyte is pumped into the electrolytic cell, and the titanium-based iridium-ruthenium coated electrode is used as the anode, and the stainless steel plate electrode is used as the cathode for direct electrolytic treatment. The temperature of the electrolyte is 43±2°C, and the curren...

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Abstract

The invention relates to a mixed additive for electrolyzing acid etching waste liquid to prepare copper powder and a preparation method of the copper powder. Per liter of a mixed additive aqueous solution comprises the following components: 0-30mg gelatin, 10-40mg oleic acid, 0-50mg sodium hexametaphosphate, 10-70mg hexadecyl trimethyl ammonium chloride, 20-60mg citric acid and 10-40mg ammonium chloride. With the adoption of the mixed additive for electrolysis copper deposition treatment on the etching waste liquid, the superfine copper powder having high added value can be prepared, and recycling of the etching waste liquid is realized. A titanium base oxygen evolution electrode is taken as an electrolytic anode, and no chlorine is liberated during electrolytic regeneration, so that the recycling of the etching waste liquid is realized, and no harm to the environment is caused.

Description

technical field [0001] The invention relates to a recycling method for printed circuit board etching waste liquid, in particular to a mixed additive for preparing superfine copper powder from acidic etching waste liquid and a copper powder preparation method, belonging to the field of recycling industrial waste liquid. Background technique [0002] Printed Circuit Board (PCB) is an important part of electronic products. In recent years, with the development of the electronics industry, the production of printed circuit boards has developed rapidly, and it has also caused a large number of circuit board etching solutions. . my country is the largest PCB production base in the world. Etching waste liquid is the main hazardous waste liquid in PCB production. Etching waste liquid contains a large amount of copper ions, usually as high as 120-180g / L. High-concentration copper-containing waste liquid has a high pollution index. If it is discharged directly, it will not only endan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C5/02C23F1/46C25C7/02
CPCC25C5/02C23F1/46C25C7/02
Inventor 孙云飞杨祥魁朱义刚徐策王维河薛伟宋佶昌王学江徐好强王其伶谢锋冯秋兴
Owner SHANDONG JINBAO ELECTRONICS
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