ABSTRACT The purpose of this study was to investigate the role of grinding media type, water chemistry and pyrite mineralogy on the galvanic interaction between grinding media and pyrite during grinding of a gold ore. The galvanic current between pyrite and grinding media increased with the electrochemical activity of the grinding media, while it decreased as a function of increasing chromium content in the media. Furthermore, changing the pyrite-based electrode from pure pyrite to a gold-bearing pyrite electrode increased the galvanic current between the pyrite and the grinding media electrodes; therefore, the gold-bearing pyrite electrode is more active than the pure pyrite one. In addition, using process water instead of tap water increased the galvanic current density between pyrite and the high-chromium grinding media electrode (30% chromium). However, when the forged steel or the low-chromium grinding media electrodes were used, the galvanic current decreased compared to the tap water condition. In addition, the results obtained from SEM-EDX analysis showed that in both tap and process water conditions, oxide species were identified on the surface of the forged steel and low chromium electrodes. However, no oxygen was detected on the surface of the 30% chromium grinding media.

中文翻译：

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磨矿介质、黄铁矿矿物学和水化学对磨矿介质和黄铁矿之间电相互作用的影响

摘要 本研究的目的是研究研磨介质类型、水化学和黄铁矿矿物学对金矿石研磨过程中研磨介质和黄铁矿之间的电相互作用的作用。黄铁矿和研磨介质之间的电流随着研磨介质的电化学活性而增加，而随着介质中铬含量的增加而降低。此外，将黄铁矿基电极从纯黄铁矿改为含金黄铁矿电极增加了黄铁矿和研磨介质电极之间的电流；因此，含金黄铁矿电极比纯黄铁矿电极更活跃。此外，使用工艺水代替自来水增加了黄铁矿和高铬研磨介质电极（30% 铬）之间的电流密度。然而，当使用锻钢或低铬研磨介质电极时，与自来水条件相比，电偶电流降低。此外，从 SEM-EDX 分析获得的结果表明，在自来水和工艺用水条件下，在锻钢和低铬电极的表面上都发现了氧化物。然而，在 30% 铬研磨介质的表面上没有检测到氧气。