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首页> 外文期刊>International Journal of Electrochemical Science >Electrochemical study on Surface Oxidation of Natural Pyrite in Ferric Sulfate Solution
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Electrochemical study on Surface Oxidation of Natural Pyrite in Ferric Sulfate Solution

机译：硫酸铁溶液中天然硫铁矿表面氧化的电化学研究

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Surface oxidation of natural massive pyrite in 0.5 M sulfuric acid solutions with different ferricconcentrations was investigated. The electrode of natural pyrite was made and its behavior was measuredusing cyclic voltammetry (CV), linear sweep voltammetry (LSV) and rotating disk electrode (RDE).According to the test results, the open circuit potential (OCP) of pyrite grew steadily when the ferricconcentration increased. Furthermore, the rate of pyrite oxidation was strengthened with the addition offerric ions. However, it is difficult to distinguish the chemical or electrochemical oxidation on pyrite andtheir interaction process. Here, the electron transferred numbers (ETNs) of oxidation processes on pyritewere calculated. And it is found the ETN could be a useful tool to compare rapidly the oxidationreactivity for different conditions. The overall surface oxidation process on pyrite occurred in thepotential range of -0.450 V to 0.050 V vs. AgCl/Ag. The average ETN for pyrite oxidation was around2 in sulfuric acid. The increasing of ferric ion was found to affect ETN markedly while the polarizationcurrent was raised, which indicate that the pyrite electrochemical oxidation was inhibited by addingferric ions, and the dissolution was the main result of chemical oxidation. Moreover, the studies of thesurface oxidation on pyrite with adding silver ion and that on chalcopyrite were also conducted toconfirm the new founds. Silver ion is inferred to be difficult to form silver atoms and influence theoxygen electrochemical oxidation less.
机译：研究了不同铁浓度的0.5 M硫酸溶液中天然块状黄铁矿的表面氧化。制备了天然黄铁矿电极，并通过循环伏安法（CV），线性扫描伏安法（LSV）和旋转圆盘电极（RDE）测量了其行为。根据测试结果，黄铁矿的开路电势（OCP）在上升时稳定增长。铁浓度增加。此外，黄铁矿的氧化速率通过添加提供的离子得以增强。但是，很难区分黄铁矿上的化学氧化或电化学氧化及其相互作用过程。在此，计算了在黄铁矿上的氧化过程的电子转移数（ETNs）。并且发现ETN可能是一种有用的工具，可以快速比较不同条件下的氧化反应性。相对于AgCl / Ag，在黄铁矿上的整个表面氧化过程发生在-0.450 V至0.050 V的电位范围内。在硫酸中，黄铁矿氧化的平均ETN约为2。发现当极化电流增加时，铁离子的增加会显着影响ETN，这表明黄铁矿的电化学氧化受到铁离子的抑制，而溶解是化学氧化的主要结果。此外，还进行了添加银离子对黄铁矿和黄铜矿表面氧化的研究，以确认新发现。推测银离子难以形成银原子并且难以影响氧电化学氧化。

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