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Method for recycling copper from etching solution through combination of multistage cross current and counter current

An etching solution and cross-flow technology, which is applied in the field of copper-containing wastewater treatment and recovery, can solve the problems of extraction agent loss and mutual pollution, and achieve the effects of avoiding loss, improving use efficiency and reducing mutual pollution

Inactive Publication Date: 2013-12-04
孟辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a compact, efficient, environmentally friendly multi-stage cross-flow and counter-current method for recovering copper in the etching solution, and improve the extraction-electrolysis system and extraction agent. Utilization rate, solve the problem of loss of extractant in the circulation process and mutual pollution in the process of material circulation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take the alkaline etching waste liquid with a copper ion concentration of 120g / L and a pH value of 8.8 as the liquid to be extracted, adjust the flow rate of the alkaline etching waste liquid to 240L / h, and adjust the primary extraction, secondary extraction, and tertiary extraction respectively. The organic copper extraction agent Lix-84 in the device has a flow rate of 720L / h, 240L / h, and 240L / h. The copper ion concentration of the regenerated etching solution after three-stage extraction is 30g / L, and the etching capacity of the regenerated etching solution is >100g / L. Control the washing water flow in a washing water cycle to be 290L / h, wash the copper-rich extractant, and the Cl in the copper-rich extractant after washing -1 content 4 2- The content in the medium is less than 1.5ppm, the current efficiency in the electrolytic cell is 92.7%, and the purity of the electrolytic copper product is greater than 99.95%.

Embodiment 2

[0031]Take the alkaline etching waste liquid with a copper ion concentration of 140g / L and a pH value of 9.0 as the liquid to be extracted, adjust the flow rate of the alkaline etching waste liquid to 260L / h, and adjust the primary extraction, secondary extraction, and tertiary extraction respectively The organic copper extraction agent Lix-84 flow rate in the device is 780L / h, 260L / h, 260L / h, the copper ion concentration of the regenerated etching solution after three-stage extraction is 42.6g / L, and the etching capacity of the regenerated etching solution is >100g / L , control the washing water flow in a washing cycle to be 260L / h, wash the copper-rich extractant, and the Cl in the copper-rich extractant after washing -1 Content 4 2- The content in the medium is less than 1.0ppm, the current efficiency in the electrolytic cell is 93.5%, and the purity of the electrolytic copper product is greater than 99.95%.

Embodiment 3

[0033] Take the alkaline etching waste liquid with a copper ion concentration of 160g / L and a pH value of 8.0 as the liquid to be extracted, adjust the flow rate of the alkaline etching waste liquid to 280L / h, and adjust the primary extraction, secondary extraction, and tertiary extraction respectively The organic copper extraction agent flow rate Lix-84 in the device is 840L / h, 280L / h, 280L / h, the copper ion concentration of the regenerated etching solution after three-stage extraction is 45.3g / L, and the etching capacity of the regenerated etching solution is >100g / L , control the washing water flow in a washing cycle to be 280L / h, wash the copper-rich extractant, and the Cl in the copper-rich extractant after washing -1 content 4 2- The content in the medium is less than 1.5ppm, the current efficiency in the electrolytic cell is 93.1%, and the purity of the electrolytic copper product is greater than 99.95%.

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Abstract

The invention relates to a technology for handling and recycling copper-containing wastewater, in particular to a method for recycling copper from an etching solution through combination of multistage cross currents and counter currents. The method disclosed by the invention comprises the steps of extracting, water scrubbing, re-extracting and secondary water scrubbing; the copper ion concentration of final raffinate can reach 0.5g / L; and the purity of the electrolytic copper product is more than 99.95%. The method improves the utilization ratio of the extraction-electrolysis system and the electrolysis, and solves the problems about loss of the extracting agent during the cyclic process and cross contamination during the material cyclic process.

Description

technical field [0001] The invention relates to the treatment and recovery technology of copper-containing waste water, in particular to a method for recovering copper in etching solution through the combination of multistage cross-flow and counter-current. Background technique [0002] Printed circuit boards are the foundation of the electronic information industry, and modern high-tech products are inseparable from printed circuit boards. Printed circuit boards will produce a large amount of copper-containing wastewater during the production process, such as acid-base etching solution, micro-etching solution, roughening and other wastewater containing a large amount of copper ions. The PCB industry is a metal resource consuming industry and is regarded as an industry with serious heavy metal pollution, but it is also an industry that uses the most metal resources. That is to say, the reasonable recovery and regeneration of heavy metal pollution is equivalent to the develop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C25C1/12
CPCY02P10/20
Inventor 张湘梅陈鉴铨周漫武斌彭鹏
Owner 孟辉
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