Hydrometallurgical process for the recycling of copper using anodic oxidation of cuprous ammine complexes and flow-through electrolysis
Hydrometallurgical process for the recycling of copper using anodic oxidation of cuprous ammine complexes and flow-through electrolysis
复制标题
DOI：
10.1016/j.electacta.2007.10.046
复制
发表时间：
2008-01-01
影响因子：
6.6
通讯作者：
Lee, J. -C.
中科院分区：
文献类型：
--
作者：
Oishi, T.;Yaguchi, M.;Lee, J. -C.
研究了从亚铜氨络合物电解提取铜的流通电解，以开发使用氯化氨溶液的湿法冶金铜回收工艺，重点是亚铜氨络合物的阳极氧化。在批量条件下，电流密度为200 A m(-2)时，该阳极氧化的电流效率为96%。在使用亚升电解槽和碳毡阳极的流通电解中，阳极电流效率随着流速的增加而增加，通常高于 97%。这种趋势可以通过在阳极上形成的铜氨络合物通过隔膜的回流来解释。即使表观电流密度为1500 A m(-2)，阳极过电位也低于0.3 V。在升规模的电池中也实现了类似的电流效率和过电势，这表明了这种电解的规模灵活性。该电解槽在电流密度为250和500 A·m(-2)时，铜电解沉积的功耗要求分别为460和770 kWh t(-1)，尽管极间距离较长，但仍远低于传统铜电解沉积的功耗。 (c) 2007 Elsevier Ltd. 保留所有权利。
Flow-through electrolysis for copper electrowinning from cuprous ammine complex was studied in order to develop a hydrometallurgical copper recycling process using an ammoniacal chloride solution, focusing on the anodic oxidation of cuprous to cupric ammine complexes. The current efficiency of this anodic oxidation was 96% at a current density of 200 A m(-2) under a batch condition. In a flow-through electrolysis using a sub-liter cell and a carbon felt anode, the anodic current efficiency increased with the flow rate and was typically higher than 97%. This tendency was explained by the backward flow of the cupric ammine complex, which was formed on the anode, through the diaphragm. The anodic overpotential was lower than 0.3 V even at an apparent current density of 1500 A m(-2). A similar current efficiency and overpotential were also achieved in a liter scale cell, which indicates the scale flexibility of this electrolysis. The power consumption requirements for copper electrowinning in this cell were 460 and 770 kWh t(-1) at the current densities of 250 and 500 A m(-2), respectively, which were much lower than that of the conventional copper electrowinning despite the longer interpolar distance. (c) 2007 Elsevier Ltd. All rights reserved.