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采用循环伏安(CV)、扫描电子显微镜(SEM)和电化学阻抗谱(EIS)研究黄铜矿在含有5×10-4mol/L乙黄药溶液中的电化学行为以及电位对黄铜矿表面膜层成分和性质的影响。结果表明:在开路电位(OCP)下,天然黄铜矿表面发生黄药阴离子的吸附过程;在阳极电位范围-0.11～0.2V内,主要发生黄药阴离子氧化形成疏水双黄药膜层的电化学过程。形成的双黄药膜层在电位为0V时具有较高覆盖度和较大的厚度,随着电位的增加表面双黄药膜层的覆盖度和厚度减小。当电位高于0.2V时,黄铜矿表面发生以自身活化溶解为主的电化学过程,黄铜矿表面由双黄药膜层转化成为大量具有多孔和疏松结构的含有Cu(Ⅱ)和Fe(Ⅲ)的氧化物。
Cyclic voltammetry (CV), scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS) were used to study the electrochemical behavior of chalcopyrite in solution containing 5 × 10-4 mol / L of betaine and the effect of potential on chalcopyrite Surface film composition and properties of the impact. The results show that under the open circuit potential (OCP), the adsorption of xanthate anion occurs on the surface of natural chalcopyrite. In the anode potential range of -0.11 ~ 0.2V, the anion of xanthate is oxidized mainly to form the membrane of hydrophobic xanthate Chemical process. The formation of the double xanthate membrane in the potential of 0V with high coverage and greater thickness, with the potential increase in the surface of the double xanthate membrane coverage and thickness decreases. When the potential is higher than 0.2V, the surface of chalcopyrite undergoes an electrochemical process that is mainly activated by self-activation. The chalcopyrite surface is transformed into a large number of porous and loose structures containing Cu (Ⅱ) and Fe (III) oxide.