|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deriving Value from Challenging Waste Streams: Recycling and Sustainability Joint Session
||B-8: Determination of Limiting Current Density of a Solution with Copper, Zinc and EDTA from the Effluent of Brass Electrodeposition
||Kayo Santana Barros, Jorge Alberto Soares Tenório, Denise Crocce Romano Espinosa
|On-Site Speaker (Planned)
||Denise Crocce Romano Espinosa
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. Hence, the present paper aims to determine the limiting current density of the effluent generated in the free-cyanide electrodeposition of copper and zinc using EDTA as complexing agent using chronopotentiometry for the treatment of the effluent by electrodialysis using the membrane HDX 200. The solutions were prepared with copper sulfate and zinc sulfate in different conditions of pH (9-13), proportion of cupric ions (30, 50, 70) and EDTA/copper molar ratio (2–3.5). According to the results, the increase of pH, EDTA concentration and cupric ions proportion caused an increase in the limiting current density because of the large amount of OH-, EDTA and the complexes.