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| Study on Electrowinning Sheet-form Copper from Acidic Etchant Waste in Diaphragm Cell |
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Received:February 21, 2011
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| DOI：DOI：10.3969/j.issn.1007-7545.2011.09.011 |
| KeyWord:Acidic etchant waste; Cation exchange membrane; Electro winning |
| Author | Institution |
| YANG Xing |
中南大学冶金科学与工程学院 |
| YANG Sheng-hai |
中南大学冶金科学与工程学院 |
| GUO Huan |
中南大学冶金科学与工程学院 |
| CHEN Yong-ming |
中南大学冶金科学与工程学院 |
| LIU Qing |
中南大学冶金科学与工程学院 |
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| Abstract: |
| Copper-starting-sheet cathode and graphite anode were adapted to electrowin sheet-form metallic copper from acidic cupric chloride etchant waste in diaphragm cell with cation exchange membrane. The effects of initial Cu2+ and Cl- concentration in cathode compartment, cathodic current density, bath temperature and distance on electrowinning process were investigated. The optimal conditions were obtained including initial Cl- concentration of 5.5 mol/L, initial H+ concentration of 3.0 mol/L, additives of 0.2 g/L, cathode current density of 350 A/m2, bath temperature of 36 ℃, distance 5 cm and Cu2+ concentration from 40 g/L down to 20 g/L. Under these optimum conditions, cathode current efficiency could reach 92.77%, average cell voltage could be under 3 V, dense sheet-form metallic copper could be obtained on cathode and the catholyte waste could return to prepare the new etching solution. |
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