2-ethylhexanal oximeによる塩化物溶液からのCuの溶媒抽出

概要

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There has been a trend to switch from pyrometallurgy to hydrometallurgy in copper refining of copper sulphide ores since pyrometallurgy process needs a huge amount of energy and is harmful to the environment. In this study, focusing on the extraction selectivity of EHO (2-ethylhexanal oxime), which extracts Cu, Ni and Pd from chloride solution, the mechanism and behavior of Cu2+ extraction with EHO from the leached solution of copper sulphide ores with ferric chloride solution and stripping of copper with water were investigated in order to clarify the possibility of an environmentally friendly hydrometallurgical process. The EHO extracts Cu2+ selectively from the chloride solution and the extraction reaction is a solvation type as follows ; Cu2+aq + 2Cl-aq + EHOorg〓CuCl2・2EHOorg The extractant does not extract other metal ions such as Zn2+, Fe2+ and Fe3+, which are the main impurities in the leached solution. It was also found that the extraction is an exothermic reaction of ΔH=-130kJ/mol and the stripping reaction is endothermic with the reaction heat of ΔH=43kJ/mol.
1999-09-25