Water reclamation and chemicals recovery from a novel cyanide-free copper plating bath using electrodialysis membrane process

Author(s)

Scarazzato, T. ^{[1, 2, 3]} ; Panossian, Z. ^{[3, 4]} ; Tenorio, J. A. S. ^[2] ; Perez-Herranz, V. ^[1] ; Espinosa, D. C. R. ^[2]

Affiliation

^[1] Univ Politecn Valencia, Dept Engn Quim & Nucl, IEC Grp, Cami Vera S-N, POB 22012, E-46071 Valencia - Spain

^[2] Univ Sao Paulo, Chem Engn Dept, Av Prof Lineu Prestes 580, Bloco 18, BR-05434070 Sao Paulo, SP - Brazil

^[3] Inst Technol Res, Corros & Protect Lab, Av Prof Almeida Prado 532, BR-05508901 Sao Paulo, SP - Brazil

^[4] Univ Sao Paulo, Dept Met & Mat Engn, Av Prof Mello Moran 2463, BR-05508030 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: DESALINATION; v. 436, p. 114-124, JUN 15 2018.
• Web of Science Citations: 5

Abstract

One of the industrial concerns is to change procedures into sustainable and cleaner processes. In electroplating, researches have been developed to replace toxic materials for safer alternatives. Cyanide salts are toxic compounds used as complexing agents in alkaline baths. This work focused in a cyanide-free copper alkaline bath developed for copper coating onto zinc alloys. Electrodialysis was evaluated to obtain a concentrated solution from a model rinsing water and simultaneously to treat the effluent for further reuse. Membrane properties after electrodialysis were analyzed, before and after cleaning procedures. Deposition tests were performed using electrolytes containing the recycled inputs and the coatings were analyzed. As results, a solution 5 to 6 times more concentrated than the initial one was obtained. The average demineralization was 90% and the percent extraction of ions was higher than 80%. Interactions between the organic acid and the exchange groups may affect membrane properties. Nevertheless, FTIR analyses and the applied cleaning procedures showed that bonds between phosphorus and quaternary amine may be reversible. Both cleaning procedures presented similar performance and partially restored the membrane properties. The concentrate could be added to the copper bath to compensate eventual drag-out losses without affecting the quality of the coatings. (AU)

• FAPESP's process: 16/17527-0 - Evaluation of the selectivity of two anion exchange membranes for selective separation of an organic acid
• Grantee: Tatiana Scarazzato
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 14/13351-9 - Treatment of effluents from cyanide-free electroplating processes by electrodialysis for recovering of water and inputs
• Grantee: Tatiana Scarazzato
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 12/51871-9 - Study Center for Technology in Waste Solid Treatment and Recycling - SCTWSTR
• Grantee: Jorge Alberto Soares Tenório
• Support Opportunities: Research Projects - Thematic Grants