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Mixed additive for electrolyzing alkaline etching waste fluid, and method for preparing copper powder with same

A technology of mixing additives and etching waste liquid, applied in the field of recycling industrial waste liquid, can solve the problems of high production cost, corroded equipment, unsuitable use, etc., and achieves the effects of stable product quality, simple production process and low manufacturing cost

Active Publication Date: 2017-07-28
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
Due to the large amount of Cl contained in the etching waste liquid - , 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 membrane to separate etching solution, adding strong alkali equipment to recover chlorine gas, etc. No matter what kind of modification will increase production investment and process flow

Method used

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  • Mixed additive for electrolyzing alkaline etching waste fluid, and method for preparing copper powder with same
  • Mixed additive for electrolyzing alkaline etching waste fluid, and method for preparing copper powder with same
  • Mixed additive for electrolyzing alkaline etching waste fluid, and method for preparing copper powder with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A mixed additive for electrolytic alkaline etching waste liquid, containing the following components in every liter of the aqueous solution of the mixed additive:

[0035]

[0036]

[0037] The method for preparing copper powder by using the above-mentioned mixed additives to electrolyze alkaline etching waste liquid, the operation steps are:

[0038] 1) Microporous precision filtration is carried out to the etching waste liquid, and the copper ion concentration of the obtained solution is 140g / L;

[0039] 2) Dilute the filtered etching waste liquid, add water until the copper ion concentration is 35g / L, add 55ml / L of mixed additives, and make an electrolyte;

[0040] 3) The electrolyte is pumped into the electrolytic cell, the nickel-based active coating 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 45±2°C, and the current density is 1000A / m ...

Embodiment 2

[0044] A mixed additive for electrolytic alkaline etching waste liquid, containing the following components in every liter of the aqueous solution of the mixed additive:

[0045]

[0046] The method for preparing copper powder by using the above-mentioned mixed additives to electrolyze alkaline etching waste liquid, 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 120g / L;

[0048] 2) Dilute the filtered etching waste liquid, add water until the copper ion concentration is 40g / L, add 100ml / L of mixed additives, and make an electrolyte;

[0049] 3) The electrolyte is pumped into the electrolytic cell, 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 30±2°C, and the current density is 1300A / m 2 ;

...

Embodiment 3

[0053] A mixed additive for electrolytic alkaline etching waste liquid, containing the following components in every liter of the aqueous solution of the mixed additive:

[0054]

[0055] The method for preparing copper powder by using the above-mentioned mixed additives to electrolyze alkaline etching waste liquid, 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 30g / L, add 80ml / L of mixed additives, and make an electrolyte;

[0058] 3) Pump the electrolyte into the electrolytic cell, use the titanium-based iridium coating electrode as the anode, and the stainless steel plate electrode as the cathode for direct electrolytic treatment. The temperature of the electrolyte is 53±2°C, and the current density is 800A / m 2 ;

[0059] 4) Peel off an...

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Abstract

The invention relates to a mixed additive for electrolyzing alkaline etching waste fluid, and a method for preparing copper powder with the mixed additive. Every litre of the aqueous solution of the mixed additive comprises the following components of 10 mg to 40 mg of urea, 0 mg to 30 mg of sodium hexametaphosphate, 0 mg to 30 mg of dodecyl trimethyl ammonium chloride, 10 mg to 50 mg of citrate, 10 mg to 70 mg of methyl trioctyl ammonium chloride, and 10 mg to 30 mg of triethanolamine. The mixed additive is adopted for carrying out electrolysis copper deposition treatment on the alkaline etching waste fluid, superfine copper powder with high additional value can be prepared, and recycling of the etching fluid is realized. Because a chlorine inhibition and oxygen evolution electrode is adopted as the electrolysis anode, no chlorine is separated out in the process of electrolysis regeneration, and no damage is caused to the environment while beneficial reuse of the etching waste fluid is realized.

Description

technical field [0001] The invention relates to a recycling method for printed circuit board etching waste liquid, in particular to a mixed additive used for electrolysis of alkaline etching waste liquid to prepare ultra-fine copper powder and a method for preparing copper powder using the additive, which belongs to the industry Waste liquid recycling field. 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 di...

Claims

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Application Information

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IPC IPC(8): C25C5/02C23F1/46
CPCC23F1/46C25C5/02
Inventor 孙云飞杨祥魁徐策王维河薛伟宋佶昌王学江徐好强谢锋王其伶朱义刚冯秋兴
Owner SHANDONG JINBAO ELECTRONICS
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