Abstract: The study of the oxidation mechanism of pyrite is much,but no investigation has been made on the oxidation behavior of pyrite in the presence of Ni2＋ in acidic solutions.Various electrochemical test techniques such as open-circuit potential measurements,linear voltammetric scanning,and electrochemical impedance spectroscopy were used to investigate the electrochemical oxidation behavior of pyrite in an acidic Ni2＋ solution.The experimental results show that the open-circuit potential of pyrite electrode decreases with increasing Ni2＋ concentration,that the corrosion current density increases with increasing Ni2＋ concentration,and that the oxidation rate of pyrite eletrode surface accelerates with increasing Ni2＋.