It is of great significance to improve the flotation of copper sulfide minerals at low temperatures. In this study, the reduction mechanism of chalcopyrite flotation performance and the role of copper ions in improving the flotation of chalcopyrite at low temperatures were systematically investigated. The results of the flotation tests prove that the chalcopyrite flotation recovery is lower at low temperatures (5℃) than at room temperatures (20℃), which is directly related to the changes in the surface hydrophobicity. However, the addition of copper ions can effectively improve the chalcopyrite flotation at low temperatures. Electrochemical measurements indicate that copper ions positively affect the redox reaction and electron transport on the chalcopyrite surface at low temperatures, thereby increasing the current density and surface activity of chalcopyrite. Besides, X-ray photoelectron spectroscopy analysis and adsorption measurements clearly indicate that copper ions mainly adsorbed on chalcopyrite surface in the form of CuS species by chemisorption, thereby significantly enhancing the adsorption amounts of xanthate on the chalcopyrite surface and improving the flotation of chalcopyrite at low temperatures.

中文翻译：

---

铜离子在改善黄铜矿低温浮选中的作用


改善硫化铜矿物在低温下的浮选具有重要意义。本研究系统研究了黄铜矿浮选性能的还原机理和铜离子在低温下改善黄铜矿浮选的作用。浮选试验结果证明，黄铜矿浮选回收率在低温 （5°C） 下低于室温 （20°C），这与表面疏水性的变化直接相关。然而，铜离子的加入可以有效改善黄铜矿在低温下的浮选。电化学测量表明，铜离子在低温下对黄铜矿表面的氧化还原反应和电子传递产生积极影响，从而增加了黄铜矿的电流密度和表面活性。此外，X射线光电子能谱分析和吸附测量清楚地表明，铜离子主要通过化学吸附以CuS物种的形式吸附在黄铜矿表面，从而显著提高了黄铜酸盐表面黄药的吸附量，改善了黄铜矿在低温下的浮选。