System and method for treating wastewater of containing copper from microetching printed circuit board

Abstract

This invention discloses a system for treating copper-containing wastewater from micro etching of printed circuit board. The system comprises a copper separation system, an electrolysis system, a wastewater pre-treatment system and a wastewater post-treatment system. The copper separation system comprises a copper extractor and a copper back extractor. The electrolysis system comprises an electrolysis tank and a NaClO electrolysis membrane. The wastewater pre-treatment system comprises a copper-containing wastewater pool and an automatic pH detector. The wastewater post-treatment system comprises an oil-separation tank, a stirrer and a lift oil-absorber. The treatment method combines stirring, clarification and back extraction, and recovers solutes from aqueous solution by using extraction technique. The copper-removing rate is up to 90%, and the copper content in the wastewater is reduced by at least 80%. The wastewater can meet discharge standards.

Description

technical field [0001] The invention relates to a system and method for treating waste water generated in the production process of printed circuit boards, in particular to a system and method for treating waste water containing copper from micro-etching of printed circuit boards. Background technique [0002] Copper-containing wastewater is wastewater generated during the production of printed circuit boards. With the development of modernization in our country, the demand for electronic products is increasing day by day, most of the electronic components rely on printed circuit boards. Therefore, a large number of printed circuit boards are manufactured every day, and at the same time, a large amount of production waste liquid is also produced every day. Printed circuit board micro-etching copper-containing wastewater is one of the waste liquids. Direct discharge is harmful to the environment. At the same time, it is a pity that a large amount of copper in the waste liqui...

AI Technical Summary

Problems solved by technology

[0005] The replacement method is to use iron to replace the copper in the wastewater. The main problems are that the pH value in the wastewater must be adjusted before the treatment. A certain amount of iron will be consumed during the treatment process, and the copper powder generated by the replacement is not pure. , and the copper in the wastewater cannot be recovered to the maximum extent, the reaction conditions are not easy to control, and secondary pollutants such as FeCI2 will also be produced

[0006] The neutralization method is generally to add NAOH to neutralize the acid in it to generate CU(OH) 2 Precipitation, after washing away the chloride ions, use concentrated H 2 SO4 generates CUSO 4 , so that the copper in the wastewater can be treated and recovered. The main problem of this method is that a large amount of alkali and H will be consumed in the process of treatment. 2 SO4, and the recovery of copper is not complete, and a large amount of water resources will be consumed when cleaning chloride ions

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