Direct electrochemical extraction of Cu-Ni alloy from nickel matte through chlorination and deep eutectic solvent leaching-electrodeposition processes has been investigated in this work. The reaction mechanism of the selective chlorination process and the influences of chlorination parameters including roasting temperature, roasting time and chlorinating agent addition on the chlorinated products were investigated thermodynamically and experimentally. The result shows that the sulfides (Ni₃S₂ and Cu₂S) contained in nickel matte can convert into chlorides (NiCl₂ and CuCl) and sulfates (Na₂Ni(SO₄)₂ and NiSO₄) during the chlorination process. ChCl-urea deep eutectic solvent was then used to leach Cu and Ni components from the chlorinated products, and the leaching rates of Ni and Cu can reach 40.24% and 58.21%, respectively. Finally, Cu-Ni alloy has been electrodeposited from the leached electrolyte, and the morphology, phase composition, and corrosion resistance of the electrodeposited Cu-Ni alloy were systematically investigated. It is suggested that the selective chlorination and deep eutectic solvent leaching-electrodeposition processes provide a promising strategy for the extraction of Cu-Ni alloy from complex nickel matte.

在这项工作中，已经研究了通过氯化和深共熔溶剂浸出-电沉积工艺从哑光镍中直接电化学提取铜镍合金的方法。通过热力学和实验研究了选择性氯化过程的反应机理以及焙烧温度，焙烧时间和加入氯化剂等氯化参数对氯化产物的影响。结果表明，雾面镍中所含的硫化物（Ni ₃ S ₂和Cu ₂ S）可以转化为氯化物（NiCl ₂和CuCl）和硫酸盐（Na ₂ Ni（SO ₄）₂和NiSO ₄）在氯化过程中。然后使用ChCl-脲深层共熔溶剂从氯化产物中浸出铜和镍成分，镍和铜的浸出率分别达到40.24％和58.21％。最后，从浸出的电解液中电解沉积了Cu-Ni合金，并系统地研究了电沉积Cu-Ni合金的形貌，相组成和耐蚀性。研究表明，选择性氯化和深共熔溶剂浸出-电沉积工艺为从复杂镍雾中提取Cu-Ni合金提供了有希望的策略。