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http://dx.doi.org/10.7844/kirr.2017.26.4.88

Effect of NaOCl and Gold Plating Additive on the Gold Recovery in Cyclone Electrolytic Cell from Solution for Stripping Gold of PCB by Cyanide  

Jo, Hyeonji (Department of Ocean Energy and Resources Engineering, Korea Maritime and Ocean University)
Yoo, Kyoungkeun (Department of Ocean Energy and Resources Engineering, Korea Maritime and Ocean University)
Bae, Mooki (Korea Institute of Geoscience and Mineral Resources)
Sohn, Jeongsoo (Korea Institute of Geoscience and Mineral Resources)
Yang, Donghyo (Korea Institute of Geoscience and Mineral Resources)
Kim, Sookyung (Korea Institute of Geoscience and Mineral Resources)
Publication Information
Resources Recycling / v.26, no.4, 2017 , pp. 88-94 More about this Journal
Abstract
The recovery of gold in cyclone type electrolytic cell was conducted from solution for stripping gold of PCB by cyanide. The electrolytic recovery behaviors of gold was investigated by reaction time and addition of electrolytic sodium hypochlorite (NaOCl) and gold plating additive (KG-120). Because the electrolysis generated NaOCl reacted with the cyanide in the leachate by alkaline chlorination, more than 99% of the cyanide was removed at a $NaOCl(g)/CN^-(g)$ ratio of 1.0. When NaOCl was added during the recovery of the gold from cyanide leachate in the cyclone electrolytic cell, the recovery of gold was 98% at the ratio of $NaOCl(g)/CN^-(g)$ from 0.5 to 2.5 in 480 minutes and decreased rapidly over the ratio of 3.0. Gold was recovered more than 99% by adding 1.5 and 4.5%(v/v) of KG-120 with NaOCl in 480 minutes. In particular, when the concentration of KG-120 was 3.5 and 4.5%(v/v), more than 96% of gold was recovered within 240 minutes and the initial recovery rate was relatively faster. The optimum concentration of KG-120 is 3.5%(v/v) considering the economic feasibility and efficiency.
Keywords
Au; stripping solution; cyclone electrolytic cell; cyanide; sodium hypochlorite; KG-120;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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