Method for recovery and reusing of etching liquid containing copper ions and nitrate

A copper ion and etching solution technology, applied in the improvement of process efficiency, instruments, optics, etc., can solve the problems such as the lack of recycling of etching solution, the inability to obtain large-area copper blocks, etc., to achieve easy automatic control, reduce Concentration fluctuation, the effect of huge economic benefits

Active Publication Date: 2019-06-11
湖北永绍科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the technical problem that in the prior art, during the recovery process of the etching solution containing copper ions and nitrate radicals, copper cannot obtain a large-area copper block, and the etching solution is not recycled.

Method used

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  • Method for recovery and reusing of etching liquid containing copper ions and nitrate

Examples

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Effect test

Embodiment 1

[0047] A method for reclaiming and reusing etching solution containing copper ions, nickel ions and nitrates, comprising the following steps:

[0048] Step A: Collect copper-containing waste nitric acid etching solution, and process the etching solution through an electrodialysis device;

[0049] Step B: the high-concentration copper-containing etching solution produced in step A enters the copper extraction tank for cyclic electrolysis;

[0050] Step C: using the thick copper plate produced in step B as an anode, and electrolyzing it in a refining tank to form No. 1 copper plate;

[0051] Step D: collecting the low-concentration copper-containing wastewater produced in steps A and B, and performing cyclone electrolysis on the wastewater to obtain copper pipes and copper powder;

[0052] Step E: if the waste liquid contains nickel, add ammonia water, sodium hydroxide and other agents to the waste liquid to adjust the pH to precipitate nickel ions;

[0053] Step F: add a cert...

Embodiment 2

[0062] A method for reclaiming and reusing etching solution containing copper ions and nitrates, comprising the following steps:

[0063] Step A: Collect waste nitric acid etching solution containing copper, and process the etching solution through an electrodialysis device;

[0064] Step B: the high-concentration copper-containing etching solution produced in step A enters the copper extraction tank for cyclic electrolysis;

[0065] Step C: using the thick copper plate produced in step B as an anode, and electrolyzing it in a refining tank to form No. 1 copper plate;

[0066] Step D: collecting the low-concentration copper-containing wastewater produced in steps A and B, and performing cyclone electrolysis on the wastewater to obtain copper pipes and copper powder;

[0067] If the waste liquid contains nickel, add ammonia water, sodium hydroxide and other agents to the waste liquid to adjust the pH to precipitate nickel ions;

[0068] Step E: if the waste liquid contains ni...

Embodiment 3

[0077] A method for reclaiming and reusing etching solution containing copper ions and nitrates, comprising the following steps:

[0078] Step A: Collect waste nitric acid etching solution containing copper, and process the etching solution through an electrodialysis device;

[0079] Step B: the high-concentration copper-containing etching solution produced in step A enters the copper extraction tank for cyclic electrolysis;

[0080] Step C: using the thick copper plate produced in step B as an anode, and electrolyzing it in a refining tank to form No. 1 copper plate;

[0081] Step D: collecting the low-concentration copper-containing wastewater produced in steps A and B, and performing cyclone electrolysis on the wastewater to obtain copper pipes and copper powder;

[0082] If the waste liquid contains nickel, add ammonia water, sodium hydroxide and other agents to the waste liquid to adjust the pH to precipitate nickel ions;

[0083] Step E: if the waste liquid contains ni...

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Abstract

The invention discloses a method for recovery and reusing of etching liquid containing copper ions and nitrate, and belongs to the technical field of etching liquid recovery. The method comprises thefollowing steps that a high-concentration copper-containing solution and a low-concentration copper-containing solution are obtained from the etching liquid through an electrodialysis device, the high-concentration copper-containing solution enters a copper extraction tank to be subjected to circulating electrolysis, thus the copper ions are reduced to generate copper elementary substances, the copper elementary substances are deposited on a copper electrode serving as a cathode, the cathode serves as an anode in a refining tank, thus the anode in the refining tank is dissolved out on the cathode, and a copper plate is obtained; electrolyte, with the low copper ion concentration, obtained in the copper extraction tank and the low-concentration copper-containing solution generated in the electrodialysis device are subjected to swirling flow electrolysis, and thus a copper pipe and/or copper powder are/is obtained; and concentrated nitric acid is added into clear liquid, and thus the etching liquid is recycled. If the etching liquid contains nickel ions, after electrolysis is completed, lye is added to adjust pH, and thus the nickel ions are precipitated. Copper recycled through themethod is high in economic value, a chemical agent is not put, and secondary pollution is avoided; and the etching liquid is regenerated and recycled, and resources are maximally utilized.

Description

technical field [0001] The invention belongs to the technical field of etching solution recycling, and more specifically relates to a method for recycling and reusing etching solution containing copper ions and nitrates. Background technique [0002] Copper-containing waste nitric acid etching solution is wastewater produced in the electronics industry. In the process of deplating or cleaning wastewater for printed circuit boards, such copper-containing waste nitric acid etching solution will be produced, and sometimes it also contains a small amount of nickel metal. With the increasing output of printed circuit boards, there are more and more copper-containing waste nitric acid etching solutions. The content of copper ions or nickel ions in the waste solution greatly exceeds the national sewage discharge standard. If it is discharged directly, it will cause harm to the environment. Huge pollution, and copper and nickel ions have certain recovery value. Therefore, measures ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/46C25C1/12C25C5/02
CPCY02P10/20
Inventor 吴旭王梨王小赫贺明古月圆袁笃宋潇唐文吴小龙李涛安宁
Owner 湖北永绍科技股份有限公司
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