This work attempts to clarify the reason for low gold recovery in Carlin-type gold ores flotation by revealing the correlation of interactions between pyrite and dolomite during the oxidation process with flotation performance. In this paper, the sulfur oxidation rate determined by Ion chromatography (IC) was adopted to evaluate the oxidation degrees of the mixed pyrite and dolomite systems. Flotation tests observed that the difference in the floating rate of pyrite and dolomite gradually decreases with the accumulation of oxidation degrees. The normalized Fourier Transform Infrared Spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) identified the homogenization effect that occurs between pyrite and dolomite surface during the oxidation process can change the affinity of the mineral surface towards the xanthate collector. Focused beam reflectance measurement (FBRM), Particle video microscope (PVM), and Extended Derjaguin–Landau–Verwey–Overbeek (E-DLVO) calculation show that the homogenization effect changes the interaction force between oxidized pyrite and dolomite, and caused the adhesion between minerals, ultimately, deteriorated the separation performance of Carlin-type gold deposits. This study can give a more detailed explanation of the reason for poor selectivity in the Carlin-type gold ores flotation.

中文翻译：

---

均质效应与氧化黄铁矿和白云石之间浮选分离的相关性


这项工作试图通过揭示氧化过程中黄铁矿和白云石相互作用与浮选性能的相关性，阐明 Carlin 型金矿石浮选中金回收率低的原因。本文采用离子色谱法 （IC） 测定的硫氧化速率来评价黄铁矿和白云石混合体系的氧化度。浮选试验观察到，随着氧化程度的积累，黄铁矿和白云石的浮动速率差异逐渐减小。归一化傅里叶变换红外光谱 （FTIR） 和 X 射线光电子能谱 （XPS） 确定了氧化过程中黄铁矿和白云石表面之间发生的均质效应可以改变矿物表面对黄原酸盐捕收剂的亲和力。聚焦光束反射测量 （FBRM）、粒子视频显微镜 （PVM） 和扩展 Derjaguin-Landau-Verwey-Overbeek （E-DLVO） 计算表明，均质效应改变了氧化黄铁矿和白云石之间的相互作用力，并导致矿物之间的粘附，最终恶化了 Carlin 型金矿床的分离性能。本研究可以更详细地解释 Carlin 型金矿石浮选选择性差的原因。