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Copper extraction method of etching waste liquid or low copper containing waste liquid

A technology for etching waste liquid and waste water, which is applied to the improvement of process efficiency, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of increasing the cost of secondary treatment, not being able to effectively solve environmental pollution, and being unable to treat, etc., to achieve Realize cleaner production, rich economic benefits, and environmental protection effects

Inactive Publication Date: 2007-01-31
JIANGMEN CITY PENGJIANG DISTRICT DA YING MECHANICAL & ELECTRICAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using this method, more than 40% of the copper ions in the etching waste liquid are still untreated, which increases the cost of secondary treatment
However, low-copper-containing wastewater cannot be treated, and the problem of environmental pollution cannot be effectively solved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The acid etching waste liquid is collected into the corresponding tank and pumped into the extraction container, and it is fully mixed with the copper extractant composed of hydroxyketone oxime and aldol oxime, so that the copper ions in the acid etching waste liquid are transferred. into the copper extraction agent, after extraction and separation, the extraction agent containing copper ions is back-extracted with sulfuric acid diluent with a concentration of 10% to obtain copper sulfate liquid, and then the copper sulfate liquid is pumped into an electrolytic cell for electrolysis to obtain an electrolytic solution. Copper; in the acid etching waste liquid after copper extraction, an appropriate amount of sulfuric acid is added for online recycling.

Embodiment 2

[0016] The alkaline etching waste liquid is collected into the corresponding tank and pumped into the extraction container, so that it is fully mixed with RE-608 high-efficiency copper extraction agent, so that the copper ions in the alkaline etching waste liquid are transferred to the copper extraction agent, After extraction and separation, the extraction agent containing copper ions is back-extracted with sulfuric acid diluent with a concentration of 20% to obtain copper sulfate liquid, and then the copper sulfate liquid is pumped into the electrolytic cell for electrolysis to obtain electrolytic copper; after copper extraction In the alkaline etching waste liquid, add an appropriate amount of ammonia chloride and liquid ammonia, and then recycle it online.

Embodiment 3

[0018] Collect the low-copper-containing wastewater into the corresponding tank and pump it into the extraction container to fully mix it with the RE-608 high-efficiency copper extractant, so that the copper ions in the low-copper-containing wastewater are transferred to the copper extractant, extracting and separating. Then, the extraction agent containing copper ions is back-extracted with sulfuric acid diluent with a concentration of 30% to obtain copper sulfate liquid, and then the copper sulfate liquid is pumped into the electrolytic cell for electrolysis to obtain electrolytic copper; The copper-containing wastewater is discharged to the factory's comprehensive wastewater treatment station for treatment.

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Abstract

This invention relates to a process of extracting copper from etching effluent or low copper waste water. The process includes follow steps: mix the etching effluent or low copper waste water with copper extractant to transfer the copper ion; poaching the extractant with 10%-50% sulphuric acid to gain copper sulfate solution; process electrolysis of copper sulfate solution in electrolytic tank to gain electrolytic tough pitch copper; add sulphuric acid, chlorizated ammonia or liquid ammonia to the used etching effluent for reapplication.

Description

technical field [0001] The invention relates to a method for extracting copper from etching waste liquid or low-copper-containing waste water in the printed circuit board industry. Background technique [0002] In the printed circuit board industry, the etching waste liquid is divided into: acid etching waste liquid and alkaline etching waste liquid. The low copper-containing wastewater is divided into: micro-etching liquid, water washing liquid, roughening liquid and chromic copper waste liquid. These waste liquids and wastewaters have the characteristics of various types, high toxicity and strong corrosiveness. They belong to the national first-class hazardous waste. If they are discharged without treatment, they will cause extremely serious damage to the ecology, and even threaten the safety of people's lives. Moreover, these waste liquids and wastewaters contain a large amount of expensive copper ions. If they are not refined and recovered, a large amount of valuable re...

Claims

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Application Information

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IPC IPC(8): C25C1/12C02F1/26C02F1/461C23F1/46C22B3/26C22B15/00
CPCY02P10/20
Inventor 王万春
Owner JIANGMEN CITY PENGJIANG DISTRICT DA YING MECHANICAL & ELECTRICAL EQUIP
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