Journal of Guangdong University of Technology ›› 2005, Vol. 22 ›› Issue (3): 21-24.

• Comprehensive Studies • Previous Articles     Next Articles

The Recovery of EDTA in Waste PCB Chemical-copper Solution

  

  1. (1.Faculty of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510090,China;2.Shenzhen Hazardous Waste Treatment Station,Shenzhen 518049,China)
  • Online:2005-07-02 Published:2005-07-02

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Abstract: In this paper copper is reduced by formaldehyde which is contained in the wastewater of chemical copper plating.The EDTA acid can be recycled after acidulation.Using EDTA,EDTA-Na2 and new chemical copper plating solution are prepared.It is shown that the removal rate of copper is 99.6%.The（EDTA） recovery is more than 98%,and the purity of EDTA-Na2 which is made from EDTA is more than 98.5%.It can be used in industrys of chemical copper plating again.

Key words: PCB； chemical-copper； EDTA； recovery；

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