Garrido Belen, Cifuentes Gerardo, Fredes Pedro, Pino Eduardo, Calderón Cristian, Cifuentes-Cabezas Magdalena
Metallurgical Engineering Department, University of Santiago of Chile (USACH), Santiago, Chile.
Department of Environmental Science, University of Santiago of Chile (USACH), Santiago, Chile.
Front Chem. 2021 Jan 28;8:622611. doi: 10.3389/fchem.2020.622611. eCollection 2020.
Alkaline leaching with highly selective ammoniacal complexing agents is an interesting alternative for the treatment of copper concentrates. This treatment is beneficial for copper recovery because it allows the formation of soluble amines complexes, with cupric tetramine ( ) being the most stable. In order to suppress the unit operation of solvent extraction (SX) and move directly to the electrochemical process, an electro-electrodialysis (EED) process using ion exchange membranes to obtain copper is proposed. The study contemplates the operation with synthetic ammonia solutions containing copper at different concentrations and current density under standard conditions of pressure and temperature. The presented data demonstrate that the concentration of copper in the solution and the excess of ammonia are inversely related to the efficiency of the current and the voltage of the cell, whereas an increase in current density causes an increase in current efficiency, contrary to what happens in sulfuric systems.
使用高选择性氨络合剂进行碱性浸出是处理铜精矿的一种有趣的替代方法。这种处理方法有利于铜的回收，因为它能形成可溶性胺络合物，其中四氨合铜（ ）最为稳定。为了省去溶剂萃取（SX）单元操作并直接进入电化学过程，提出了一种使用离子交换膜来获取铜的电渗析（EED）工艺。该研究考虑了在标准压力和温度条件下，使用不同浓度含铜合成氨溶液并在不同电流密度下进行操作。所呈现的数据表明，溶液中铜的浓度和氨的过量与电流效率和电池电压呈反比关系，而与硫酸体系中情况相反，电流密度的增加会导致电流效率提高。
