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Study of Adsorption of Sodium Isopropyl Xanthate on Galena

机译：在伽利热纳钠异丙基钠的吸附研究

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This paper deals with a study of the oxidation processes of the PbS-sodium isopropyl xanthate system in alkaline conditions (pH 8, similar to flotation circuits Pb-Cu) by using cyclic voltammetry and Electrochemical Impedance Spectroscopy (EIS). Three oxidation peaks are identified in the voltammograms that correspond to reactions previously reported in the literature. A plot of the differential capacitance of the double layer vs. potential gives a potential of zero charge (PZC) of -0.31 V vs. SCE for the system, that coincides with an oxidation peak attributed to the adsorption of xanthate. EIS at PZC for different xanthate concentrations evidence an adsorption processes via a charge transfer mechanism under diffusional control. EIS data at potentials more positive than PZC display an inductive loop that is related to a charge transfer processes involving the reaction of the adsorbed intermediates with the consequent modification of the PbS-sodium isopropyl xanthate interface.
机译：本文通过使用循环伏安法和电化学阻抗光谱（EIS）对碱性条件（pH8，类似于浮选电路PB-Cu）的PBS-钠异丙基黄原酸盐体系的氧化方法研究。在对应于先前在文献中报道的反应的伏安图中鉴定了三个氧化峰。双层与电位的差分电容的曲线图给出了系统的零电荷（PZC）的电位，其归一致归因于黄原酸盐的吸附致氧化峰。 PZC的EIS用于不同的黄原酸盐浓度证据证据通过电荷转移机制在扩散控制下进行吸附过程。潜在的EIS数据比PZC更积极地显示与涉及吸附中间体反应的电荷转移过程有关的电感环，随后对异丙酯炔酸盐界面的改变。

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