Determination of Limiting Current Density of a Solution with Copper, Zinc and EDTA from the Effluent of Brass Electrodeposition

Author(s):Show less -

Barros, K. S. ; Tenorio, J. A. S. ; Espinosa, D. C. R. ; Sun, Z ; Wang, C ; Guillen, DP ; Neelameggham, NR ; Zhang, L ; Howarter, JA ; Wang, T ; Olivetti, E ; Zhang, M ; Verhulst, D ; Guan, X ; Anderson, A ; Ikhmayies, S ; Smith, YR ; Pandey, A ; Pisupati, S ; Lu, H

• Document type: Journal article
• Source: ENERGY TECHNOLOGY 2018: CARBON DIOXIDE MANAGEMENT AND OTHER TECHNOLOGIES; v. N/A, p. 9-pg., 2018-01-01.

Abstract

In the last decades, authors have been focused in the development of a cyanide-free bath for the electroplating industry of brass due to the risks that involves the use of cyanide and they have been evaluated the electrodialysis as an alternative method for the treatment of the effluent generated in this type of industry because of the limitations caused by the chemical precipitation. Hence, the present paper aimed to determine the limiting current density of the effluent generated in the free-cyanide electrodeposition of copper and zinc using EDTA as chelating agent for the treatment of the effluent by electrodialysis. The synthesized solutions were prepared with copper sulfate and zinc sulfate in different conditions of pH (10-12) and proportion of cupric ions (30%, 50%, 70%). According to the results, the increase of pH and the cupric ions proportion caused an increase in the limiting current density because of the larger amount of anionic species in solution and the consequent difficult to achieve the concentration polarization phenomenon. (AU)

• 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