The electrochemical interaction between galena and monoclinic pyrrhotite was investigated to examine its impact on the physical and chemical properties of the mineral micro-surface. This investigation employed techniques such as electrochemistry, metal ion stripping, X-ray photoelectron spectroscopy, and quantum chemistry. The electrochemical test results demonstrate that the galena surface in the electro-couple system exhibits a lower electrostatic potential and higher electrochemical activity compared to the monoclinic pyrrhotite surface, rendering it more susceptible to oxidation dissolution. Monoclinic pyrrhotite significantly amplifies the corrosion rate of the galena surface. Mulliken charge population calculations indicate that electrons are consistently transferred from galena to monoclinic pyrrhotite, with the number of electron transfers on the mineral surface increasing as the interaction distance decreases. The analysis of state density revealed a shift in the surface state density of galena towards lower energy levels, resulting in decreased reactivity and increased difficulty for the reagent to adsorb onto the mineral surface. Conversely, monoclinic pyrrhotite exhibited an opposite trend. The X-ray photoelectron spectroscopy (XPS) test results indicate that galvanic interaction leads to the formation of hydrophilic substances, PbSxOy and Pb(OH)2, on the surface of galena. Additionally, the surface of monoclinic pyrrhotite not only adsorbs Pb2+ but also undergoes S0 formation, thereby augmenting its hydrophobic nature.

中文翻译：

---

单斜磁黄铁矿 （0 0 1） 和方铅矿 （1 0 0） 表面电化学相互作用的电化学和 DFT 研究


研究了方铅矿和单斜磁黄铁矿之间的电化学相互作用，以检查其对矿物微表面物理和化学性质的影响。这项研究采用了电化学、金属离子剥离、X 射线光电子能谱和量子化学等技术。电化学测试结果表明，与单斜磁黄铁矿表面相比，电耦合系统中的方铅矿表面表现出较低的静电电位和较高的电化学活性，使其更容易发生氧化溶解。单斜磁黄铁矿显着放大了方铅矿表面的腐蚀速率。Mulliken 电荷群计算表明，电子始终从方铅矿转移到单斜磁黄铁矿，矿物表面的电子转移数量随着相互作用距离的减小而增加。状态密度分析显示，方铅矿的表面状态密度向较低的能级转变，导致反应性降低，试剂吸附到矿物表面的难度增加。相反，单斜磁黄铁矿则表现出相反的趋势。X 射线光电子能谱 （XPS） 测试结果表明，电相互作用导致在方铅矿表面形成亲水性物质 PbSxOy 和 Pb（OH）2。此外，单斜磁黄铁矿的表面不仅吸附 Pb2+，而且还会形成 S0，从而增强其疏水性。