Effects of chalcopyrite interfacial properties on the adsorption kinetics of xanthate at high-altitude areas: New insights from theory and experiment

The low-pressure environment in high-altitude areas reduces dissolved oxygen (DO) content in water. However, its impact on the interfacial properties of chalcopyrite and the adsorption behavior of reagents remains unclear. To investigate the adsorption behavior of xanthate on chalcopyrite surfaces in this condition, a controlled experimental system simulating these environments was established. The study revealed that under pH 8.5, the adsorption rate of sodium isobutyl xanthate (SIBX) on chalcopyrite surfaces was significantly slower, with looser adsorption structures and lower adsorption capacity under high-altitude conditions. Further analysis of the adsorption mechanism showed that the degree of surface hydroxylation did not significantly impact the xanthate adsorption process. Moreover, the adsorption kinetics were dominated by the corrosion current, which was observed to be significantly lower on chalcopyrite surfaces in high-altitude areas with reduced DO content. This lower corrosion current is the primary factor responsible for the decreased adsorption rate of xanthate. These findings advance the application of electrochemical theory in sulfide ore processing, optimize collector utilization efficiency, and contribute to the development of more efficient and environmentally sustainable mineral processing practices in high-altitude areas.