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Method for recovering and regenerating copper in waste etching liquid

A technology of etching waste liquid and acidic etching waste liquid, which is applied in the direction of photographic process, instrument, photographic auxiliary process, etc., can solve the problems of environmental hazards, environmental pollution, waste of resources, etc., achieve recycling, improve purity, and realize industrialized production Effect

Pending Publication Date: 2021-11-02
HONGLI SHANTOU ELECTRONICS TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the etching process of circuit boards, a large amount of etching waste liquid will be produced, and the etching waste liquid contains a large amount of copper ions. Direct discharge will not only cause harm to the environment, pollute the environment, but also cause waste of resources. Therefore, it is necessary to study and utilize Copper recovery and regeneration technology in etching waste liquid to realize recycling of etching waste liquid

Method used

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  • Method for recovering and regenerating copper in waste etching liquid
  • Method for recovering and regenerating copper in waste etching liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The acidic etching waste liquid and the alkaline etching waste liquid are classified and collected, and the oil suction box is first put into the liquid surface of the acidic etching waste liquid and the alkaline etching waste liquid respectively to remove grease, and the oil suction box is set There is an accommodating cavity, and an oil-absorbing layer is arranged in the accommodating cavity, and a plurality of oil filter pores are opened on the side wall of the oil-absorbing box, and each of the oil filter pores communicates with the accommodating cavity respectively, and the oil-filtering pores are respectively connected to the The acidic etching waste liquid and the alkaline etching waste liquid are filtered to remove particulate impurities;

[0055] Add the pretreated acidic etching waste liquid into the first electrolytic cell, and pass direct current to carry out electrolytic operation, control the electrolytic current density to 180A / m2, and the electrolytic tem...

Embodiment 2

[0060] The acidic etching waste liquid and the alkaline etching waste liquid are classified and collected, and the oil suction box is first put into the liquid surface of the acidic etching waste liquid and the alkaline etching waste liquid respectively to remove grease, and the oil suction box is set There is an accommodating cavity, and an oil-absorbing layer is arranged in the accommodating cavity, and a plurality of oil filter pores are opened on the side wall of the oil-absorbing box, and each of the oil filter pores communicates with the accommodating cavity respectively, and the oil-filtering pores are respectively connected to the The acidic etching waste liquid and the alkaline etching waste liquid are filtered to remove particulate impurities;

[0061] Add the pretreated acidic etching waste liquid into the first electrolytic tank, and pass through direct current to carry out electrolytic operation, control the electrolytic current density to 190A / m2, and the electrol...

Embodiment 3

[0066] The acidic etching waste liquid and the alkaline etching waste liquid are classified and collected, and the oil suction box is first put into the liquid surface of the acidic etching waste liquid and the alkaline etching waste liquid respectively to remove grease, and the oil suction box is set There is an accommodating cavity, and an oil-absorbing layer is arranged in the accommodating cavity, and a plurality of oil filter pores are opened on the side wall of the oil-absorbing box, and each of the oil filter pores communicates with the accommodating cavity respectively, and the oil-filtering pores are respectively connected to the The acidic etching waste liquid and the alkaline etching waste liquid are filtered to remove particulate impurities;

[0067] Add the pretreated acidic etching waste liquid into the first electrolytic tank, and pass through direct current to carry out electrolytic operation, control the electrolytic current density to 195A / m2, and the electrol...

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Abstract

The invention relates to a method for recovering and regenerating copper in waste etching liquid. The method comprises the following steps of classifying and collecting acidic waste etching liquid and alkaline waste etching liquid, and correspondingly carrying out pretreatment operation on the acidic waste etching liquid and the alkaline waste etching liquid; adding the pretreated acidic waste etching liquid into a first electrolytic bath, and introducing direct current to carry out electrolysis operation; adding the pretreated alkaline waste etching liquid into a second electrolytic bath, and introducing direct current to carry out electrolysis operation; adding a first supplement into a first electrolyzed solution to obtain a regenerated acidic etching solution; and adding a second supplement into a second electrolyzed liquid to obtain a regenerated alkaline etching liquid. The acidic waste etching liquid and the alkaline waste etching liquid are pretreated, so that normal electrolysis operation is guaranteed, the purity of copper obtained through electrolysis can be greatly improved, the regenerated acidic etching liquid and the regenerated alkaline etching liquid can be obtained correspondingly, recycling of the acidic waste etching liquid and the alkaline waste etching liquid is achieved, the process is simple, and the energy is saved.

Description

technical field [0001] The invention relates to the technical field of circuit board etching liquid treatment, in particular to a method for recovering and regenerating copper in etching waste liquid. Background technique [0002] In the production process of circuit boards, there will be a process of etching circuit boards, and in the etching process of circuit boards, as the etching time increases, the concentration of copper ions in the etching solution will gradually increase, thereby reducing The etching effect of the etching solution even makes the etching solution completely lose its efficacy. Therefore, it is necessary to replace the etching solution in time to ensure the normal operation of the etching process of the circuit board. [0003] However, due to the etching process of circuit boards, a large amount of etching waste liquid will be produced, and the etching waste liquid contains a large amount of copper ions. Direct discharge will not only cause harm to the...

Claims

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Application Information

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IPC IPC(8): C23F1/46C25C1/12C25C7/06
CPCC23F1/46C25C1/12C25C7/06Y02P10/20
Inventor 李豪姜伟
Owner HONGLI SHANTOU ELECTRONICS TECH LTD
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