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http://dx.doi.org/10.9727/jmsk.2014.27.4.183

The Variation of Cu Recovery by Electrowinning Conditions and Their Mineralogical Characteristics from Cathodic Deposition-powdered Copper  

Cho, Kang-Hee (Department of Energy and Resource Engineering, Chosun University)
Kim, Bong-Ju (Department of Energy and Resource Engineering, Chosun University)
Choi, Nag-Choul (Department of Rural Systems Engineering/Research Institute for Agriculture and Life Science, Seoul National University)
Park, Cheon-Young (Department of Energy and Resource Engineering, Chosun University)
Publication Information
Journal of the Mineralogical Society of Korea / v.27, no.4, 2014 , pp. 183-195 More about this Journal
Abstract
In order to study the mineralogical characteristics of a cathodic deposition-metallic powder, electrowinning experiments were carrier out on different electrolytic solutions at varying electric distances and electric currents. Under the same experimental conditions, Cu recovery was obtained much more effectively using a sodium chloride electrolyte than with a sulfuric acid electrolyte. In XRD analysis, copper ($Cu^0$), chalcanthite and cuprite were identified in the sulfuric acid electrolyte, while copper, nantokite and chalcanthite were observed in the sodium chloride electrolyte. In the sodium chloride electrolyte solution, increasing the electric distance and the electric current increased the Cu recovery rate, anode weight and anodic corrosion. The results of XRD analysis with non-pulverized cathodic deposition-metallic powder showed the average copper crystallite size was increased by increasing the electric current and decreasing the electric distance. It is suggested that the mass transfer was controlled with diffusion on the boundary between the electrode and the electrolytic solution due to the formation of dendrite copper.
Keywords
electrowinning; electrolyte; Cu recovery; crystallite size; dendritic copper;
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